dns_server: fix crash issue

when `./Configure --api=1.0.0`, we should not use CRYPTO_set_id_callback().

.github/ISSUE_TEMPLATE/issue.md

@@ -15,6 +15,11 @@ assignees: ''
 
 2. 运营商  
 
+3. smartdns来源以及版本
+
+4. 涉及的配置(注意去除个人相关信息)
+
+
 **重现步骤**
 1. 上游DNS配置。  
 
@@ -22,8 +27,8 @@ assignees: ''
 
 
 **信息收集**  
-1. 将/var/log/smrtdns.log日志作为附件上传。  
+1. 将/var/log/smrtdns.log日志作为附件上传(注意去除个人相关信息)。  
-2. 如进程异常，请将coredump功能开启，上传coredump信息文件。  
+2. 如进程异常，请将coredump功能开启，上传coredump信息文件，同时上传配套的smartdns进程文件。  
 在自定义界面，开启设置->自定义设置->生成coredump配置，重现问题后提交coredump文件
 coredump文件在/tmp目录下
 

.github/workflows/c-cpp.yml

@@ -0,0 +1,17 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: make
+      run: make

Dockerfile

@@ -1,18 +1,39 @@
- FROM debian:buster-slim
+FROM ubuntu:latest as smartdns-builder
-
+LABEL previous-stage=smartdns-builder
+COPY . /smartdns/
 RUN apt update && \
-     apt install -y git make gcc libssl-dev && \
+    apt install -y perl wget make musl-tools musl-dev && \
-     git clone https://github.com/pymumu/smartdns.git --depth 1 && \
+    OPENSSL_VER=1.1.1f && \
-     cd smartdns && \
+    mkdir /build -p && \
-     sh ./package/build-pkg.sh --platform debian --arch `dpkg --print-architecture` && \
+    ln -s /usr/include/linux /usr/include/$(uname -m)-linux-musl && \
-     dpkg -i package/*.deb && \
+    ln -s /usr/include/asm-generic /usr/include/$(uname -m)-linux-musl && \
-     cd / && \
+    ln -s /usr/include/$(uname -m)-linux-gnu/asm /usr/include/$(uname -m)-linux-musl && \
-     rm -rf smartdns/ && \
+    cd /build && \
-     apt autoremove -y git make gcc libssl-dev && \
+    wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_${OPENSSL_VER}.orig.tar.gz && \
-     apt clean && \
+    tar xf openssl_${OPENSSL_VER}.orig.tar.gz && \
-     rm -rf /var/lib/apt/lists/*
+    cd openssl-${OPENSSL_VER} && \
+    export CC=musl-gcc && \
+    if [ "$(uname -m)" = "aarch64" ]; then \
+        ./config --prefix=/opt/build no-tests -mno-outline-atomics ; \
+    else \ 
+        ./config --prefix=/opt/build no-tests; \
+    fi && \
+    make all -j8 && make install_sw && \
+    cd /smartdns && \
+    export CFLAGS="-I /opt/build/include" && \
+    export LDFLAGS="-L /opt/build/lib" && \
+    sh ./package/build-pkg.sh --platform linux --arch `dpkg --print-architecture` --static && \
+    mkdir /release -p && \
+    cd /smartdns/package && tar xf *.tar.gz && \
+    cp /smartdns/package/smartdns/etc /release/ -a && \
+    cp /smartdns/package/smartdns/usr /release/ -a && \
+    chmod +x /release/etc/init.d/smartdns && \
+    mkdir /release/var/log/ /release/var/run/ -p && \
+    rm -fr /build /smartdns
 
+FROM busybox:latest
+COPY --from=smartdns-builder /release/ /
 EXPOSE 53/udp
 VOLUME "/etc/smartdns/"
 
- CMD ["/usr/sbin/smartdns", "-f"]
+CMD ["/usr/sbin/smartdns", "-f", "-x"]

ReadMe.md

@@ -2,28 +2,35 @@
 
 **[English](ReadMe_en.md)**
 
-![SmartDNS](https://github.com/pymumu/test/releases/download/blob/smartdns-banner.png)  
+![SmartDNS](doc/smartdns-banner.png)
-SmartDNS是一个运行在本地的DNS服务器，SmartDNS接受本地客户端的DNS查询请求，从多个上游DNS服务器获取DNS查询结果，并将访问速度最快的结果返回给客户端，提高网络访问速度。
+SmartDNS 是一个运行在本地的 DNS 服务器，它接受来自本地客户端的 DNS 查询请求，然后从多个上游 DNS 服务器获取 DNS 查询结果，并将访问速度最快的结果返回给客户端，以此提高网络访问速度。
-同时支持指定特定域名IP地址，并高性匹配，达到过滤广告的效果。  
+SmartDNS 同时支持指定特定域名 IP 地址，并高性匹配，可达到过滤广告的效果。  
-与dnsmasq的all-servers不同，smartdns返回的是访问速度最快的解析结果。 (详细差异请看[FAQ](#faq))  
+与 DNSmasq 的 all-servers 不同，SmartDNS 返回的是访问速度最快的解析结果。详细差异请看[常见问题](#常见问题)。
 
-支持树莓派，openwrt，华硕路由器，windows等设备。  
+支持树莓派、OpenWrt、华硕路由器原生固件和 Windows 系统等。  
 
 ## 目录
 
-1. [软件效果展示](#软件效果展示)
+- [SmartDNS](#smartdns)
-1. [特性](#特性)
+  - [目录](#目录)
-1. [架构](#架构)
+  - [软件效果展示](#软件效果展示)
-1. [使用](#使用)  
+  - [特性](#特性)
-    1. [下载配套安装包](#下载配套安装包)
+  - [架构](#架构)
-    1. [标准Linux系统安装](#标准linux系统安装树莓派x86_64系统)
+  - [下载](#下载)
-    1. [openwrt/LEDE](#openwrt)
+  - [安装和使用](#安装和使用)
-    1. [华硕路由器原生固件/梅林固件](#华硕路由器原生固件梅林固件)
+    - [标准 Linux 系统 / 树莓派](#标准-linux-系统--树莓派)
-    1. [optware/entware](#optwareentware)
+    - [OpenWrt](#openwrt)
-    1. [Windows 10 WSL安装/WSL ubuntu](#windows-10-wsl安装wsl-ubuntu)
+    - [华硕路由器原生固件 / 梅林固件](#华硕路由器原生固件--梅林固件)
-1. [配置参数](#配置参数)
+    - [Optware / Entware](#optware--entware)
-1. [捐助](#donate)
+    - [WSL](#wsl)
-1. [FAQ](#faq)
+  - [配置文件说明](#配置文件说明)
+  - [常见问题](#常见问题)
+  - [编译](#编译)
+  - [捐赠](#捐赠)
+    - [PayPal 贝宝](#paypal-贝宝)
+    - [AliPay 支付宝](#alipay-支付宝)
+    - [WeChat Pay 微信支付](#wechat-pay-微信支付)
+  - [开源声明](#开源声明)
 
 ## 软件效果展示
 
@@ -31,7 +38,7 @@ SmartDNS是一个运行在本地的DNS服务器，SmartDNS接受本地客户端
 使用阿里 DNS 查询百度IP，并检测结果。  
 
 ```shell
-pi@raspberrypi:~/code/smartdns_build $ nslookup www.baidu.com 223.5.5.5
+$ nslookup www.baidu.com 223.5.5.5
 Server:         223.5.5.5
 Address:        223.5.5.5#53
 
@@ -42,7 +49,7 @@ Address: 180.97.33.108
 Name:   www.a.shifen.com
 Address: 180.97.33.107
 
-pi@raspberrypi:~/code/smartdns_build $ ping 180.97.33.107 -c 2
+$ ping 180.97.33.107 -c 2
 PING 180.97.33.107 (180.97.33.107) 56(84) bytes of data.
 64 bytes from 180.97.33.107: icmp_seq=1 ttl=55 time=24.3 ms
 64 bytes from 180.97.33.107: icmp_seq=2 ttl=55 time=24.2 ms
@@ -60,11 +67,11 @@ PING 180.97.33.108 (180.97.33.108) 56(84) bytes of data.
 rtt min/avg/max/mdev = 31.014/31.094/31.175/0.193 ms
 ```
 
-**smartdns**  
+**SmartDNS**  
 使用 SmartDNS 查询百度 IP，并检测结果。
 
 ```shell
-pi@raspberrypi:~/code/smartdns_build $ nslookup www.baidu.com
+$ nslookup www.baidu.com
 Server:         192.168.1.1
 Address:        192.168.1.1#53
 
@@ -73,7 +80,7 @@ www.baidu.com   canonical name = www.a.shifen.com.
 Name:   www.a.shifen.com
 Address: 14.215.177.39
 
-pi@raspberrypi:~/code/smartdns_build $ ping 14.215.177.39 -c 2
+$ ping 14.215.177.39 -c 2
 PING 14.215.177.39 (14.215.177.39) 56(84) bytes of data.
 64 bytes from 14.215.177.39: icmp_seq=1 ttl=56 time=6.31 ms
 64 bytes from 14.215.177.39: icmp_seq=2 ttl=56 time=5.95 ms
@@ -81,138 +88,146 @@ PING 14.215.177.39 (14.215.177.39) 56(84) bytes of data.
 --- 14.215.177.39 ping statistics ---
 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
 rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
-
 ```
 
-从对比看出，smartdns找到访问www.baidu.com最快的IP地址，这样访问百度比阿里DNS速度快5倍。
+从对比看出，SmartDNS 找到了访问 www.baidu.com 最快的 IP 地址，比阿里 DNS 速度快了 5 倍。
 
 ## 特性
 
 1. **多 DNS 上游服务器**  
    支持配置多个上游 DNS 服务器，并同时进行查询，即使其中有 DNS 服务器异常，也不会影响查询。  
 
-1. **返回最快IP地址**  
+2. **返回最快 IP 地址**  
    支持从域名所属 IP 地址列表中查找到访问速度最快的 IP 地址，并返回给客户端，提高网络访问速度。
 
-1. **支持多种查询协议**  
+3. **支持多种查询协议**  
-   支持UDP，TCP，TLS, HTTPS查询，以及非53端口查询。
+   支持 UDP、TCP、TLS 和 HTTPS 查询，以及非 53 端口查询。
 
-1. **特定域名IP地址指定**  
+4. **特定域名 IP 地址指定**  
-   支持指定域名的IP地址，达到广告过滤效果，避免恶意网站的效果。
+   支持指定域名的 IP 地址，达到广告过滤效果、避免恶意网站的效果。
 
-1. **域名高性能后缀匹配**  
+5. **域名高性能后缀匹配**  
-   支持域名后缀匹配模式，简化过滤配置，过滤20万条记录时间<1ms
+   支持域名后缀匹配模式，简化过滤配置，过滤 20 万条记录时间 < 1ms。
 
-1. **域名分流**  
+6. **域名分流**  
-   支持域名分流，不同类型的域名到不同的DNS服务器查询。
+   支持域名分流，不同类型的域名向不同的 DNS 服务器查询。
 
-1. **Linux/Windows多平台支持**  
+7. **Windows / Linux 多平台支持**  
-   支持标准Linux系统（树莓派），openwrt系统各种固件，华硕路由器原生固件。以及支持Windows 10 WSL (Windows Subsystem for Linux)。
+   支持标准 Linux 系统（树莓派）、OpenWrt 系统各种固件和华硕路由器原生固件。同时还支持 WSL（Windows Subsystem for Linux，适用于 Linux 的 Windows 子系统）。
 
-1. **支持IPV4, IPV6双栈**  
+8. **支持 IPv4、IPv6 双栈**  
-   支持IPV4，IPV6网络，支持查询A, AAAA记录，支持双栈IP速度优化，并支持完全禁用IPV6 AAAA解析。
+   支持 IPv4 和 IPV 6网络，支持查询 A 和 AAAA 记录，支持双栈 IP 速度优化，并支持完全禁用 IPv6 AAAA 解析。
 
-1. **高性能，占用资源少**  
+9. **高性能、占用资源少**  
    多线程异步 IO 模式，cache 缓存查询结果。
 
 ## 架构
 
 ![Architecture](https://github.com/pymumu/test/releases/download/blob/architecture.png)
 
-1. SmartDNS接收本地网络设备的DNS查询请求，如PC，手机的查询请求。  
+1. SmartDNS 接收本地网络设备的DNS 查询请求，如 PC、手机的查询请求；
-2. SmartDNS将查询请求发送到多个上游DNS服务器，可采用标准UDP查询，非标准端口UDP查询，及TCP查询。  
+2. 然后将查询请求发送到多个上游 DNS 服务器，可支持 UDP 标准端口或非标准端口查询，以及 TCP 查询；
-3. 上游DNS服务器返回域名对应的Server IP地址列表。SmartDNS检测与本地网络访问速度最快的Server IP。  
+3. 上游 DNS 服务器返回域名对应的服务器 IP 地址列表，SmartDNS 则会检测从本地网络访问速度最快的服务器 IP；
-4. 将访问速度最快的Server IP返回给本地客户端。  
+4. 最后将访问速度最快的服务器 IP 返回给本地客户端。
 
-## 使用
+## 下载
-
-### 下载配套安装包  
 
 --------------
 
-下载配套版本的SmartDNS安装包，对应安装包配套关系如下。
+下载对应系统或固件版本的 SmartDNS 安装包，对应关系如下。
 
-|系统 |安装包|说明
+| 支持系统（架构） | 安装包 | 支持说明 |
-|-----|-----|-----
+| :--- | :--- | :--- |
-|标准Linux系统(树莓派)| smartdns.xxxxxxxx.arm-debian-all.deb|支持树莓派Raspbian stretch，Debian 9系统。
+| 标准 Linux 系统（ARM） | smartdns.1.yyyy.MM.dd-REL.arm-debian-all.deb | ARM 的树莓派 Raspbian Stretch 和 Debian 9 系统 |
-|标准Linux系统(Armbian arm64)| smartdns.xxxxxxxx.aarch64-debian-all.deb|支持ARM64的Debian stretch，Debian 9系统。
+| 标准 Linux 系统（ARM64） | smartdns.1.yyyy.MM.dd-REL.aarch64-debian-all.deb | ARM64 的 Debian Stretch 和 Debian 9 系统 |
-|标准Linux系统(x86_64)| smartdns.xxxxxxxx.x86_64-linux-all.tar.gz|支持x86_64 Linux 系统。
+| 标准 Linux 系统（x86_64） | smartdns.1.yyyy.MM.dd-REL.x86_64-linux-all.tar.gz | 64 位 Linux 系统 |
-|Windows 10 WSL (ubuntu)| smartdns.xxxxxxxx.x86_64-linux-all.tar.gz|支持Windows 10 WSL ubuntu系统。
+| 标准 Linux 系统（x86） | smartdns.1.yyyy.MM.dd-REL.x86-linux-all.tar.gz | 32 位 Linux 系统 |
-|标准Linux系统(x86)| smartdns.xxxxxxxx.x86-linux-all.tar.gz|支持x86系统。
+| WSL | smartdns.1.yyyy.MM.dd-REL.x86_64-linux-all.tar.gz | WSL |
-|optware|smartdns.xxxxxxxx.mips-optware-all.ipk|支持MIPS大端架构的optware系统。
+| Optware | smartdns.1.yyyy.MM.dd-REL.mips-optware-all.ipk | MIPS 大端架构的 Optware 系统 |
-|optware|smartdns.xxxxxxxx.mipsel-optware-all.ipk|支持MIPS小端架构的optware系统。
+| Optware（MIPS Little Endian） | smartdns.1.yyyy.MM.dd-REL.mipsel-optware-all.ipk | MIPS 小端架构的 Optware 系统 |
-|optware|smartdns.xxxxxxxx.arm-optware-all.ipk|支持arm小端架构的optware系统。
+| Optware（ARM） | smartdns.1.yyyy.MM.dd-REL.arm-optware-all.ipk | ARM 小端架构的 Optware 系统 |
-|openwrt|smartdns.xxxxxxxx.mips-openwrt-all.ipk|支持MIPS大端架构的openwrt系统。
+| OpenWrt（MIPS） | smartdns.1.yyyy.MM.dd-REL.mips-openwrt-all.ipk | MIPS 大端架构的 OpenWrt 系统 |
-|openwrt|smartdns.xxxxxxxx.mipsel-openwrt-all.ipk|支持MIPS小端架构的openwrt系统。
+| OpenWrt（MIPS Little Endian） | smartdns.1.yyyy.MM.dd-REL.mipsel-openwrt-all.ipk | MIPS 小端架构的 OpenWrt 系统 |
-|openwrt|smartdns.xxxxxxxx.arm-openwrt-all.ipk|支持arm小端架构的openwrt系统。
+| OpenWrt（ARM） | smartdns.1.yyyy.MM.dd-REL.arm-openwrt-all.ipk | ARM 小端架构的 OpenWrt 系统 |
-|openwrt LUCI|luci-app-smartdns.xxxxxxxxx.all.ipk|openwrt管理界面。
+| OpenWrt LuCI | luci-app-smartdns.1.yyyy.MM.dd-REL.all.ipk | OpenWrt 管理界面 |
-|openwrt LUCI|luci-app-smartdns.xxxxxxxxx.all-luci-compat-all|兼容版本openwrt管理界面, openwrt 18.xx及之前版本安装。
+| OpenWrt LuCI | luci-app-smartdns.1.yyyy.MM.dd-REL.all-luci-compat-all.ipk | OpenWrt 管理界面、OpenWrt 18.xx 及之前版本 |
 
-* 单独release的软件包为静态编译软件包，无外部依赖，但体积大。若需要小体积软件包，请自行编译或从openwrt/entware仓库获取。
+**[前往 Release 页面下载](https://github.com/pymumu/smartdns/releases)。**
-* 因静态编译，软件包未强制判断CPU架构，安装不正确的软件包将会导致服务无法启动，请获取正确的软件包。
 
-* **请在Release页面下载：[点击此处下载](https://github.com/pymumu/smartdns/releases)**
+**请注意：**
 
-```shell
+* Release 释出的软件包采取静态编译，无外部依赖，但体积大。若需要小体积软件包，请自行编译或从 OpenWrt / Entware 仓库获取。
-https://github.com/pymumu/smartdns/releases
-```
 
-* 各种设备的安装步骤，请参考后面的章节。
+* 静态编译的软件包未强制判断 CPU 架构，安装不正确的软件包将会导致服务无法启动，请确保正确安装对应的版本。
 
-### 标准Linux系统安装/树莓派/X86_64系统
+## 安装和使用
+
+### 标准 Linux 系统 / 树莓派
 
 --------------
 
 1. 安装
    
-    下载配套安装包`smartdns.xxxxxxxx.arm-debian-all.deb`，并上传到Linux系统中。 执行如下命令安装
+   下载配套安装包，并上传到 Linux 系统中。 
+   
+   标准 Linux 系统（X86 / X86_64）请执行如下命令安装：
    
    ```shell
-    dpkg -i smartdns.xxxxxxxx.arm-debian-all.deb
+   $ tar zxf smartdns.1.yyyy.MM.dd-REL.x86_64-linux-all.tar.gz
+   $ cd smartdns
+   $ chmod +x ./install
+   $ ./install -i
    ```
    
-    x86系统下载配套安装包`smartdns.xxxxxxxx.x86_64-linux-all.tar.gz`, 并上传到Linux系统中。 执行如下命令安装
+   树莓派或其他 Debian 系系统（ARM / ARM64）请执行如下命令安装：
    
    ```shell
-    tar zxf smartdns.xxxxxxxx.x86_64-linux-all.tar.gz
+   # dpkg -i smartdns.1.yyyy.MM.dd-REL.arm-debian-all.deb
-    cd smartdns
-    chmod +x ./install
-    ./install -i
    ```
 
-1. 修改配置
+2. 修改配置
    
-    安装完成后，可配置smartdns的上游服务器信息。具体配置参数参考`配置参数`说明。  
+    安装完成后，可配置 SmartDNS 的上游服务器信息。
-    一般情况下，只需要增加`server [IP]:port`, `server-tcp [IP]:port`配置项，
+   
-    尽可能配置多个上游DNS服务器，包括国内外的服务器。配置参数请查看`配置参数`章节。
+    一般情况下，只需要增加 `server `[`IP`]`:port` 和 `server-tcp `[`IP`]`:port` 配置项。
+   
+    请尽可能配置多个上游 DNS 服务器，包括国内外的服务器。
+   
+    具体配置参数请参考[配置文件说明](#配置文件说明)。  
    
    ```shell
-    vi /etc/smartdns/smartdns.conf
+   # vi /etc/smartdns/smartdns.conf
    ```
 
-1. 启动服务
+3. 启动服务
    
    ```shell
-    systemctl enable smartdns
+   # systemctl enable smartdns
-    systemctl start smartdns
+   # systemctl start smartdns
    ```
 
-1. 将DNS请求转发的SmartDNS解析。
+4. 将 DNS 请求转发到 SmartDNS 解析
    
     修改本地路由器的 DNS 服务器，将 DNS 服务器配置为 SmartDNS。
-    * 登录到本地网络的路由器中，配置树莓派分配静态IP地址。
+   
+   * 登录到本地网络的路由器中，配置树莓派，分配其静态 IP 地址。
    * 修改 WAN 口或者 DHCP DNS 为树莓派 IP 地址。
-    注意：  
+     **注意：**
-    I. 每款路由器配置方法不尽相同，请百度搜索相关的配置方法。  
+      I. 每款路由器配置方法不尽相同，请在网络上搜索对应配置方法。
-    II.华为等路由器可能不支持配置DNS为本地IP，请修改PC端，手机端DNS服务器为树莓派IP。
+      II. 华为等路由器可能不支持配置 DNS 为本地 IP，可修改电脑端或手机端的 DNS 服务器为树莓派 IP。
 
-1. 检测服务是否配置成功。
+5. 检测服务是否配置成功
    
-    使用`nslookup -querytype=ptr smartdns`查询域名  
+    执行
-    看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
    
    ```shell
-    pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+   $ nslookup -querytype=ptr smartdns
+   ```
+   
+    查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+   
+   ```shell
+   $ nslookup -querytype=ptr smartdns
    Server:         192.168.1.1
    Address:        192.168.1.1#53
    
@@ -220,45 +235,51 @@ https://github.com/pymumu/smartdns/releases
    smartdns        name = smartdns.
    ```
 
-### openwrt
+### OpenWrt
 
 --------------
 
 1. 安装
    
-    将软件使用winscp上传到路由器的/root目录，执行如下命令安装  
+    将软件包（使用 WinSCP 等）上传到路由器的 `/root` 目录，执行如下命令安装
    
    ```shell
-    opkg install smartdns.xxxxxxxx.xxxx.ipk
+   # opkg install smartdns.1.yyyy.MM.dd-REL.xxxx.ipk
-    opkg install luci-app-smartdns.xxxxxxxx.xxxx.all.ipk
+   # opkg install luci-app-smartdns.1.yyyy.MM.dd-REL.all.ipk
    ```
    
-    * 注意： 19.07之前的版本，请安装`luci-app-smartdns.xxxxxxxxx.all-luci-compat-all`界面。
+   * **注意：** 19.07 之前的版本，请务必安装 `luci-app-smartdns.1.yyyy.MM.dd-REL.all-luci-compat-all.ipk`。
 
-1. 修改配置
+2. 修改配置
+   
+    登录 OpenWrt 管理页面，打开 `Services` -> `SmartDNS` 进行配置。
    
-    登录openwrt管理页面，打开`Services`->`SmartDNS`进行配置。
    * 在 `Upstream Servers` 增加上游 DNS 服务器配置，建议配置多个国内外 DNS 服务器。
    * 在 `Domain Address` 指定特定域名的 IP 地址，可用于广告屏蔽。
 
-1. 启用服务
+3. 启用服务
    
-   SmartDNS服务生效方法有两种，`一种是直接作为主DNS服务`；`另一种是作为dnsmasq的上游`。  
+   SmartDNS 服务生效方法有两种，一种是**直接作为主 DNS 服务**，另一种是**作为 DNSmasq 的上游**。
    默认情况下，SmartDNS 采用第一种方式。如下两种方式根据需求选择即可。
    
-1. 启用方法一：作为主DNS(默认方案)
+   - **方法一：作为主 DNS 服务（默认方案）**
      
-    * **启用smartdns的53端口重定向**
+     * 启用 SmartDNS 的 53 端口重定向
        
-        登录路由器，点击`Services`->`SmartDNS`->`redirect`，选择`重定向53端口到SmartDNS`启用53端口转发。
+       登录 OpenWrt 管理界面，点击 `Services` -> `SmartDNS` -> `redirect`，选择 `重定向 53 端口到 SmartDNS `启用 53 端口转发。
      
-    * **检测转发服务是否配置成功**
+     * 检测转发服务是否配置成功
        
-        使用`nslookup -querytype=ptr smartdns`查询域名  
+       执行
-        看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
        
        ```shell
-        pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+       $ nslookup -querytype=ptr smartdns
+       ```
+       
+       查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+       
+       ```shell
+       $ nslookup -querytype=ptr smartdns
        Server:         192.168.1.1
        Address:        192.168.1.1#53
        
@@ -266,32 +287,40 @@ https://github.com/pymumu/smartdns/releases
        smartdns        name = smartdns.
        ```
      
-    * **界面提示重定向失败**
+     * 界面提示重定向失败
        
-        * 检查iptable，ip6table命令是否正确安装。
+       * 检查 `iptables` 和/或 `ip6tables` 命令是否正确安装。
-        * openwrt 15.01系统不支持IPV6重定向，如网络需要支持IPV6，请将DNSMASQ上游改为smartdns，或者将smartdns的端口改为53，并停用dnsmasq。
+       
-        * LEDE之后系统，请安装IPV6的nat转发驱动。点击`system`->`Software`，点击`update lists`更新软件列表后，安装`ip6tables-mod-nat`
+       * OpenWrt 15.01 系统不支持 IPv6 重定向，如网络需要支持 IPv6，请将 DNSmasq 上游改为 SmartDNS，或者将 SmartDNS 的端口改为53，并停用 DNSmasq。
-        * 使用如下命令检查路由规则是否生效。  
+       
+       * LEDE 系统请安装 IPv6 的 NAT 转发驱动。点击 `System` -> `Software`，点击 `Update lists` 更新软件列表后，安装 `ip6tables-mod-nat`。
+       
+       * 使用如下命令检查路由规则是否生效
          
          ```shell
          iptables -t nat -L PREROUTING | grep REDIRECT
          ```
        
-        * 如转发功能不正常，请使用方法二：作为DNSMASQ的上游。
+       * 如转发功能不正常，请使用**方法二：作为 DNSmasq 的上游**。
    
-1. 方法二：作为DNSMASQ的上游
+   - **方法二：作为 DNSmasq 的上游**
      
-    * **将dnsmasq的请求发送到smartdns**
+     * **将 DNSmasq 的请求发送到 SmartDNS**
        
-        登录路由器，点击`Services`->`SmartDNS`->`redirect`，选择`作为dnsmasq的上游服务器`设置dnsmasq的上游服务器为smartdns。
+       登录 OpenWrt 管理界面，点击 `Services` -> `SmartDNS` -> `Redirect`，选择`作为 DNSmasq 的上游服务器`，设置 DNSmasq 的上游服务器为 SmartDNS。
      
      * **检测上游服务是否配置成功**
        
-        * 方法一：使用`nslookup -querytype=ptr smartdns`查询域名  
+         执行
-        看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
          
          ```shell
-        pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+         $ nslookup -querytype=ptr smartdns
+         ```
+         
+         查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+         
+         ```shell
+         $ nslookup -querytype=ptr smartdns
          Server:         192.168.1.1
          Address:        192.168.1.1#53
          
@@ -299,63 +328,72 @@ https://github.com/pymumu/smartdns/releases
          smartdns        name = smartdns.
          ```
 
-        * 方法二：使用`nslookup`查询`www.baidu.com`域名，查看结果中百度的IP地址是否`只有一个`，如有多个IP地址返回，则表示未生效，请多尝试几个域名检查。
+         或执行
 
          ```shell
-        pi@raspberrypi:~ $ nslookup www.baidu.com 192.168.1.1
+         $ nslookup smartdns
-        Server:         192.168.1.1
-        Address:        192.168.1.1#53
-
-        Non-authoritative answer:
-        www.baidu.com   canonical name = www.a.shifen.com.
-        Name:   www.a.shifen.com
-        Address: 14.215.177.38
          ```
 
-1. 启动服务
+         查看命令结果是否有解析出路由器的IP地址，如果是则表示生效。
 
-    勾选配置页面中的`Enable(启用)`来启动SmartDNS
+         或执行
 
-1. 注意：
+         ```shell
+         ping smartdns.
+         ```
 
-    * 如已经安装chinaDNS，建议将chinaDNS的上游配置为SmartDNS。
+         检测ping是否解析对应主机的IP地址。
-    * SmartDNS默认情况，将53端口的请求转发到SmartDNS的本地端口，由`Redirect`配置选项控制。
+
+
+4. 启动服务
+   
+    勾选配置页面中的 `Enable（启用）`来启动 SmartDNS。
+
+5. **注意：**
+   
+   * 如已经安装 ChinaDNS，建议将 ChinaDNS 的上游配置为 SmartDNS。
+   * SmartDNS 默认情况下将 53 端口的请求转发到 SmartDNS的 本地端口，此行为由 `Redirect` 配置选项控制。
 
 ### 华硕路由器原生固件 / 梅林固件
 
 --------------
 
-说明：梅林固件派生自华硕固件，理论上可以直接使用华硕配套的安装包使用。但目前未经验证，如有问题，请提交issue。
+**说明：** 梅林固件派生自华硕固件，理论上可以直接使用华硕配套的安装包使用。但目前未经验证，如有问题，请提交 Issue。
 
 1. 准备
    
     在使用此软件时，需要确认路由器是否支持 U 盘，并准备好 U 盘一个。
 
-1. 启用SSH登录
+2. 启用 SSH 登录
    
-    登录管理界面，点击`系统管理`->点击`系统设置`，配置`Enable SSH`为`Lan Only`。  
+    登录管理界面，点击 `系统管理` -> `系统设置`，配置 `Enable SSH` 为 `Lan Only`。  
     SSH 登录用户名密码与管理界面相同。
 
-1. 下载`Download Master`
+3. 下载 `Download Master`
    
-    在管理界面点击`USB相关应用`->点击`Download Master`下载。  
+    在管理界面点击 `USB 相关应用` -> `Download Master` 下载。  
-    下载完成后，启用`Download Master`，如果不需要下载功能，此处可以卸载`Download Master`，但要保证卸载前Download Master是启用的。  
+    下载完成后，启用 `Download Master`，如果不需要下载功能，此时可以卸载 `Download Master`，但要保证卸载前 `Download Master` 是启用的。  
 
-1. 安装SmartDNS
+4. 安装 SmartDNS
    
-    将软件使用winscp上传到路由器的`/tmp/mnt/sda1`目录。（或网上邻居复制到sda1共享目录）
+    将软件包（使用 WinSCP 等）上传到路由器的 `/tmp/mnt/sda1` 目录（或网上邻居复制到 sda1 共享目录），执行如下命令安装
    
    ```shell
-    ipkg install smartdns.xxxxxxx.mipsbig.ipk
+   # ipkg install smartdns.1.yyyy.MM.dd-REL.mipsbig.ipk
    ```
 
-1. 重启路由器生效服务
+5. 重启路由器使服务生效
    
-    待路由器启动后，使用`nslookup -querytype=ptr smartdns`查询域名  
+    待路由器启动后， 执行
-    看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
    
    ```shell
-    pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+   $ nslookup -querytype=ptr smartdns
+   ```
+   
+    查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+   
+   ```shell
+   $ nslookup -querytype=ptr smartdns
    Server:         192.168.1.1
    Address:        192.168.1.1#53
    
@@ -363,10 +401,10 @@ https://github.com/pymumu/smartdns/releases
    smartdns        name = smartdns.
    ```
 
-1. 额外说明
+6. **额外说明**
    
-    上述过程，smartdns将安装到U盘根目录，采用optware的模式运行。
+    上述过程，SmartDNS 将安装到 U 盘根目录，采用 Optware 的模式运行。
-    其目录结构如下： （此处仅列出smartdns相关文件）  
+    其目录结构如下（此处仅列出 SmartDNS 相关文件）： 
    
    ```shell
    U 盘
@@ -385,10 +423,10 @@ https://github.com/pymumu/smartdns/releases
            ....
    ```
    
-    如要修改配置，可以ssh登录路由器，使用vi命令修改  
+    如要修改配置，可以 SSH 登录路由器，使用 vi 命令修改
    
    ```shell
-    vi /opt/etc/smartdns/smartdns.conf
+   # vi /opt/etc/smartdns/smartdns.conf
    ```
    
    也可以通过网上邻居修改，网上邻居共享目录 `sda1` 看不到 `asusware.mipsbig` 目录，但可以直接在`文件管理器`中输入 `asusware.mipsbig\etc\init.d` 访问
@@ -397,7 +435,7 @@ https://github.com/pymumu/smartdns/releases
    \\192.168.1.1\sda1\asusware.mipsbig\etc\init.d
    ```
 
-### optware/entware
+### Optware / Entware
 
 --------------
 
@@ -405,33 +443,38 @@ https://github.com/pymumu/smartdns/releases
    
     在使用此软件时，需要确认路由器是否支持 U 盘，并准备好 U 盘一个。
 
-1. 安装SmartDNS
+2. 安装 SmartDNS
    
-    将软件使用winscp上传到路由器的`/tmp`目录。
+    将软件（使用 WinSCP 等）上传到路由器的 `/tmp` 目录，执行如下命令安装
    
    ```shell
-    ipkg install smartdns.xxxxxxx.mipsbig.ipk
+   # ipkg install smartdns.1.yyyy.MM.dd-REL.mipsbig.ipk
    ```
 
-1. 修改smartdns配置
+3. 修改 SmartDNS 配置
    
    ```shell
-    vi /opt/etc/smartdns/smartdns.conf
+   # vi /opt/etc/smartdns/smartdns.conf
    ```
    
-    另外，如需支持IPV6，可设置工作模式为`2`，将dnsmasq的DNS服务禁用，smartdns为主用DNS服务器。将文件`/opt/etc/smartdns/smartdns-opt.conf`，中的`SMARTDNS_WORKMODE`修改为2.
+    另外，如需支持 IPv6，可设置工作模式为 `2`，将 DNSmasq 的 DNS 服务禁用，设置 SmartDNS 为主用 DNS 服务器。将文件 `/opt/etc/smartdns/smartdns-opt.conf` 中的 `SMARTDNS_WORKMODE` 的值修改为 `2`
    
    ```shell
    SMARTDNS_WORKMODE="2"
    ```
 
-1. 重启路由器生效服务
+4. 重启路由器使服务生效
    
-    待路由器启动后，使用`nslookup -querytype=ptr smartdns`查询域名  
+    待路由器启动后， 执行
-    看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
    
    ```shell
-    pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+   $ nslookup -querytype=ptr smartdns
+   ```
+   
+    查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+   
+   ```shell
+   $ nslookup -querytype=ptr smartdns
    Server:         192.168.1.1
    Address:        192.168.1.1#53
    
@@ -439,19 +482,19 @@ https://github.com/pymumu/smartdns/releases
    smartdns        name = smartdns.
    ```
    
-    注意：若服务没有自动启动，则需要设置optwre/entware自动启动，具体方法参考optware/entware的文档。
+    **注意：** 若服务没有自动启动，则需要设置 Optware / Entware 自动启动，具体方法请参考 Optware/Entware 的文档。
 
-### Windows 10 WSL安装/WSL ubuntu
+### WSL
 
 --------------
 
-1. 安装Windows 10 WSL ubuntu系统
+1. 安装 WSL
    
-    安装Windows 10 WSL运行环境，发行版本选择ubuntu系统。安装步骤请参考[WSL安装说明](https://docs.microsoft.com/en-us/windows/wsl/install-win10)
+    安装 WSL 运行环境，发行版本选择 Ubuntu 系统为例。安装步骤请参考 [WSL 安装说明](https://docs.microsoft.com/zh-CN/windows/wsl/install)
 
-1. 安装smartdns
+2. 安装 SmartDNS
    
-    下载安装包`smartdns.xxxxxxxx.x86-linux-all.tar.gz`，并解压到D盘根目录。解压后目录如下：
+    下载适用于 WSL 的安装包，并解压到如 D 盘根目录。解压后目录如下：
    
    ```shell
    D:\SMARTDNS
@@ -463,32 +506,39 @@ https://github.com/pymumu/smartdns/releases
    │  └─windows
    ├─src
    └─systemd
-
    ```
    
      双击 `D:\smartdns\package\windows` 目录下的 `install.bat` 进行安装。要求输入密码时，请输入 `WLS ubuntu` 的密码。
 
-1. 修改配置
+3. 修改配置
    
-    记事本打开`D:\smartdns\etc\smartdns`目录中的`smartdns.conf`配置文件配置smartdns。具体配置参数参考`配置参数`说明。  
+    用记事本等打开 `D:\smartdns\etc\smartdns` 目录中的 `smartdns.conf` 配置文件配置 SmartDNS。
-    一般情况下，只需要增加`server [IP]:port`, `server-tcp [IP]:port`配置项，
-    尽可能配置多个上游DNS服务器，包括国内外的服务器。配置参数请查看`配置参数`章节。
    
-1. 重新加载配置
+    一般情况下，只需要增加 `server [IP]:port` 和 `server-tcp [IP]:port` 配置项，
+    尽可能配置多个上游DNS服务器，包括国内外的服务器。
    
-    双击`D:\smartdns\package\windows`目录下的`reload.bat`进行安装。要求输入密码时，请输入`WLS ubuntu`的密码。
+    具体配置请参考[配置文件说明](#配置文件说明)。
 
-1. 将DNS请求转发的SmartDNS解析。
+4. 重新加载配置
    
-    将Windows的默认DNS服务器修改为`127.0.0.1`，具体步骤参考[IP配置](https://support.microsoft.com/zh-cn/help/15089/windows-change-tcp-ip-settings)
+    双击 `D:\smartdns\package\windows` 目录下的 `reload.bat` 进行重新加载。要求输入密码时，请输入 `WLS ubuntu` 的密码。
 
-1. 检测服务是否配置成功。
+5. 将 DNS 请求转发到 SmartDNS 解析
    
-    使用`nslookup -querytype=ptr smartdns`查询域名  
+    将 Windows 的默认 DNS 服务器修改为 `127.0.0.1`，具体步骤参考 Windows [更改 TCP/IP 设置](https://support.microsoft.com/zh-cn/help/15089/windows-change-tcp-ip-settings)。
-    看命令结果中的`name`项目是否显示为`smartdns`或`主机名`，如`smartdns`则表示生效  
+
+6. 检测服务是否配置成功
+   
+    执行
    
    ```shell
-    pi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns
+   $ nslookup -querytype=ptr smartdns
+   ```
+   
+    查看命令结果中的 `name` 是否为 `smartdns` 或你的主机名，如果是则表示生效
+   
+   ```shell
+   $ nslookup -querytype=ptr smartdns
    Server:         192.168.1.1
    Address:        192.168.1.1#53
    
@@ -496,110 +546,121 @@ https://github.com/pymumu/smartdns/releases
    smartdns        name = smartdns.
    ```
 
-## 配置参数
+## 配置文件说明
 
-|参数|  功能  |默认值|配置值|例子|
+| 键名 | 功能说明 | 默认值 | 可用值/要求 | 举例 |
-|--|--|--|--|--|
+| :--- | :--- | :--- | :--- | :--- |
-|server-name|DNS服务器名称|操作系统主机名/smartdns|符合主机名规格的字符串|server-name smartdns
+| server-name | DNS 服务器名称 | 操作系统主机名 / smartdns | 符合主机名规格的字符串 | server-name smartdns |
-|bind|DNS监听端口号|[::]:53|可绑定多个端口<br>`IP:PORT`: 服务器IP，端口号。<br>`[-group]`: 请求时使用的DNS服务器组。<br>`[-no-rule-addr]`：跳过address规则。<br>`[-no-rule-nameserver]`：跳过Nameserver规则。<br>`[-no-rule-ipset]`：跳过Ipset规则。<br>`[no-rule-soa]`：跳过SOA(#)规则.<br>`[no-dualstack-selection]`：停用双栈测速。<br>`[-no-speed-check]`：停用测速。<br>`[-no-cache]`：停止缓存|bind :53
+| bind | DNS 监听端口号  | [::]:53 | 可绑定多个端口。<br>IP:PORT: 服务器 IP:端口号<br>[-group]: 请求时使用的 DNS 服务器组<br>[-no-rule-addr]：跳过 address 规则<br>[-no-rule-nameserver]：跳过 Nameserver 规则<br>[-no-rule-ipset]：跳过 ipset 规则<br>[-no-rule-soa]：跳过 SOA(#) 规则<br>[-no-dualstack-selection]：停用双栈测速<br>[-no-speed-check]：停用测速<br>[-no-cache]：停止缓存 | bind :53 |
-|bind-tcp|TCP DNS监听端口号|[::]:53|可绑定多个端口<br>`IP:PORT`: 服务器IP，端口号。<br>`[-group]`: 请求时使用的DNS服务器组。<br>`[-no-rule-addr]`：跳过address规则。<br>`[-no-rule-nameserver]`：跳过Nameserver规则。<br>`[-no-rule-ipset]`：跳过Ipset规则。<br>`[no-rule-soa]`：跳过SOA(#)规则.<br>`[no-dualstack-selection]`：停用双栈测速。<br>`[-no-speed-check]`：停用测速。<br>`[-no-cache]`：停止缓存|bind-tcp :53
+| bind-tcp | DNS TCP 监听端口号 | [::]:53 | 可绑定多个端口。<br>IP:PORT: 服务器 IP:端口号<br>[-group]: 请求时使用的 DNS 服务器组<br>[-no-rule-addr]：跳过 address 规则<br>[-no-rule-nameserver]：跳过 nameserver 规则<br>[-no-rule-ipset]：跳过 ipset 规则。<br>[-no-rule-soa]：跳过 SOA(#) 规则<br>[-no-dualstack-selection]：停用双栈测速<br>[-no-speed-check]：停用测速<br>[-no-cache]：停止缓存 | bind-tcp :53 |
-|cache-size|域名结果缓存个数|512|数字|cache-size 512
+| cache-size | 域名结果缓存个数 | 512 | 大于等于 0 的数字 | cache-size 512 |
-|cache-persist|是否持久化缓存|自动<br>当 `cache-file` 所在的位置有超过 128MB 的可用空间时启用，否则禁用。|[yes\|no]|cache-persist yes
+| cache-persist | 是否持久化缓存 | 自动。<br>当 cache-file 所在的位置有超过 128 MB 的可用空间时启用，否则禁用。 | [yes\|no] | cache-persist yes |
-|cache-file|缓存持久化文件路径|/tmp/smartdns.cache|路径|cache-file /tmp/smartdns.cache
+| cache-file | 缓存持久化文件路径 | /tmp/smartdns.cache | 合法路径字符串 | cache-file /tmp/smartdns.cache |
-|tcp-idle-time|TCP链接空闲超时时间|120|数字|tcp-idle-time 120
+| tcp-idle-time | TCP 链接空闲超时时间 | 120 | 大于等于 0 的数字 | tcp-idle-time 120 |
-|rr-ttl|域名结果TTL|远程查询结果|大于0的数字|rr-ttl 600
+| rr-ttl | 域名结果 TTL | 远程查询结果 | 大于 0 的数字 | rr-ttl 600 |
-|rr-ttl-min|允许的最小TTL值|远程查询结果|大于0的数字|rr-ttl-min 60
+| rr-ttl-min | 允许的最小 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-min 60 |
-|rr-ttl-max|允许的最大TTL值|远程查询结果|大于0的数字|rr-ttl-max 600
+| rr-ttl-max | 允许的最大 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-max 600 |
-|log-level|设置日志级别|error|fatal,error,warn,notice,info,debug|log-level error
+| rr-ttl-reply-max | 允许返回给客户端的最大 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-reply-max 60 |
-|log-file|日志文件路径|/var/log/smartdns.log|路径|log-file /var/log/smartdns.log
+| max-reply-ip-num | 允许返回给客户的最大IP数量 | IP数量 | 大于 0 的数字 | max-reply-ip-num 1 |
-|log-size|日志大小|128K|数字+K,M,G|log-size 128K
+| log-level | 设置日志级别 | error | fatal、error、warn、notice、info 或 debug | log-level error |
-|log-num|日志归档个数|2|数字|log-num 2
+| log-file | 日志文件路径 | /var/log/smartdns.log | 合法路径字符串 | log-file /var/log/smartdns.log |
-|audit-enable|设置审计启用|no|[yes\|no]|audit-enable yes
+| log-size | 日志大小 | 128K | 数字 + K、M 或 G | log-size 128K |
-|audit-file|审计文件路径|/var/log/smartdns-audit.log|路径|audit-file /var/log/smartdns-audit.log
+| log-num | 日志归档个数 | 2 | 大于等于 0 的数字 | log-num 2 |
-|audit-size|审计大小|128K|数字+K,M,G|audit-size 128K
+| audit-enable | 设置审计启用 | no | [yes\|no] | audit-enable yes |
-|audit-num|审计归档个数|2|数字|audit-num 2
+| audit-file | 审计文件路径 | /var/log/smartdns-audit.log | 合法路径字符串 | audit-file /var/log/smartdns-audit.log |
-|conf-file|附加配置文件|无|文件路径|conf-file /etc/smartdns/smartdns.more.conf
+| audit-size | 审计大小 | 128K | 数字 + K、M 或 G | audit-size 128K |
-|server|上游UDP DNS|无|可重复<br>`[ip][:port]`：服务器IP，端口可选。<br>`[-blacklist-ip]`：blacklist-ip参数指定使用blacklist-ip配置IP过滤结果。<br>`[-whitelist-ip]`：whitelist-ip参数指定仅接受whitelist-ip中配置IP范围。<br>`[-group [group] ...]`：DNS服务器所属组，比如office, foreign，和nameserver配套使用。<br>`[-exclude-default-group]`：将DNS服务器从默认组中排除| server 8.8.8.8:53 -blacklist-ip -group g1
+| audit-num | 审计归档个数 | 2 | 大于等于 0 的数字 | audit-num 2 |
-|server-tcp|上游TCP DNS|无|可重复<br>`[ip][:port]`：服务器IP，端口可选。<br>`[-blacklist-ip]`：blacklist-ip参数指定使用blacklist-ip配置IP过滤结果。<br>`[-whitelist-ip]`：whitelist-ip参数指定仅接受whitelist-ip中配置IP范围。<br>`[-group [group] ...]`：DNS服务器所属组，比如office, foreign，和nameserver配套使用。<br>`[-exclude-default-group]`：将DNS服务器从默认组中排除| server-tcp 8.8.8.8:53
+| conf-file | 附加配置文件 | 无 | 合法路径字符串 | conf-file /etc/smartdns/smartdns.more.conf |
-|server-tls|上游TLS DNS|无|可重复<br>`[ip][:port]`：服务器IP，端口可选。<br>`[-spki-pin [sha256-pin]]`: TLS合法性校验SPKI值，base64编码的sha256 SPKI pin值<br>`[-host-name]`：TLS SNI名称。<br>`[-tls-host-verify]`: TLS证书主机名校验。<br> `-no-check-certificate:`：跳过证书校验。<br>`[-blacklist-ip]`：blacklist-ip参数指定使用blacklist-ip配置IP过滤结果。<br>`[-whitelist-ip]`：whitelist-ip参数指定仅接受whitelist-ip中配置IP范围。<br>`[-group [group] ...]`：DNS服务器所属组，比如office, foreign，和nameserver配套使用。<br>`[-exclude-default-group]`：将DNS服务器从默认组中排除| server-tls 8.8.8.8:853
+| server | 上游 UDP DNS | 无 | 可重复。<br>[ip][:port]：服务器 IP:端口（可选）<br>[-blacklist-ip]：配置 IP 过滤结果。<br>[-whitelist-ip]：指定仅接受参数中配置的 IP 范围<br>[-group [group] ...]：DNS 服务器所属组，比如 office 和 foreign，和 nameserver 配套使用<br>[-exclude-default-group]：将 DNS 服务器从默认组中排除 | server 8.8.8.8:53 -blacklist-ip -group g1 |
-|server-https|上游HTTPS DNS|无|可重复<br>`https://[host][:port]/path`：服务器IP，端口可选。<br>`[-spki-pin [sha256-pin]]`: TLS合法性校验SPKI值，base64编码的sha256 SPKI pin值<br>`[-host-name]`：TLS SNI名称<br>`[-http-host]`：http协议头主机名。<br>`[-tls-host-verify]`: TLS证书主机名校验。<br> `-no-check-certificate:`：跳过证书校验。<br>`[-blacklist-ip]`：blacklist-ip参数指定使用blacklist-ip配置IP过滤结果。<br>`[-whitelist-ip]`：whitelist-ip参数指定仅接受whitelist-ip中配置IP范围。<br>`[-group [group] ...]`：DNS服务器所属组，比如office, foreign，和nameserver配套使用。<br>`[-exclude-default-group]`：将DNS服务器从默认组中排除| server-https https://cloudflare-dns.com/dns-query
+| server-tcp | 上游 TCP DNS | 无 | 可重复。<br>[ip][:port]：服务器 IP:端口（可选）<br>[-blacklist-ip]：配置 IP 过滤结果<br>[-whitelist-ip]：指定仅接受参数中配置的 IP 范围。<br>[-group [group] ...]：DNS 服务器所属组，比如 office 和 foreign，和 nameserver 配套使用<br>[-exclude-default-group]：将 DNS 服务器从默认组中排除  | server-tcp 8.8.8.8:53 |
-|speed-check-mode|测速模式选择|无|[ping\|tcp:[80]\|none]|speed-check-mode ping,tcp:80
+| server-tls | 上游 TLS DNS | 无 | 可重复。<br>[ip][:port]：服务器 IP:端口（可选)<br>[-spki-pin [sha256-pin]]：TLS 合法性校验 SPKI 值，base64 编码的 sha256 SPKI pin 值<br>[-host-name]：TLS SNI 名称<br>[-tls-host-verify]：TLS 证书主机名校验<br> [-no-check-certificate]：跳过证书校验<br>[-blacklist-ip]：配置 IP 过滤结果<br>[-whitelist-ip]：仅接受参数中配置的 IP 范围<br>[-group [group] ...]：DNS 服务器所属组，比如 office 和 foreign，和 nameserver 配套使用<br>[-exclude-default-group]：将 DNS 服务器从默认组中排除 | server-tls 8.8.8.8:853 |
-|address|指定域名IP地址|无|address /domain/[ip\|-\|-4\|-6\|#\|#4\|#6] <br>`-`表示忽略 <br>`#`表示返回SOA <br>`4`表示IPV4 <br>`6`表示IPV6| address /www.example.com/1.2.3.4
+| server-https | 上游 HTTPS DNS | 无 | 可重复。<br>https://[host][:port]/path：服务器 IP:端口（可选）<br>[-spki-pin [sha256-pin]]：TLS 合法性校验 SPKI 值，base64 编码的 sha256 SPKI pin 值<br>[-host-name]：TLS SNI 名称<br>[-http-host]：http 协议头主机名<br>[-tls-host-verify]：TLS 证书主机名校验<br> [-no-check-certificate]：跳过证书校验<br>[-blacklist-ip]：配置 IP 过滤结果<br>[-whitelist-ip]：仅接受参数中配置的 IP 范围。<br>[-group [group] ...]：DNS 服务器所属组，比如 office 和 foreign，和 nameserver 配套使用<br>[-exclude-default-group]：将 DNS 服务器从默认组中排除 | server-https https://cloudflare-dns.com/dns-query |
-|nameserver|指定域名使用server组解析|无|nameserver /domain/[group\|-], `group`为组名，`-`表示忽略此规则，配套server中的`-group`参数使用| nameserver /www.example.com/office
+| speed-check-mode | 测速模式选择 | 无 | [ping\|tcp:[80]\|none] | speed-check-mode ping,tcp:80,tcp:443 |
-|ipset|域名IPSET|None|ipset /domain/[ipset\|-\|#[4\|6]:[ipset\|-][,#[4\|6]:[ipset\|-]]], `-`表示忽略|ipset /www.example.com/#4:dns4,#6:-
+| address | 指定域名 IP 地址 | 无 | address /domain/[ip\|-\|-4\|-6\|#\|#4\|#6] <br>- 表示忽略 <br># 表示返回 SOA <br>4 表示 IPv4 <br>6 表示 IPv6 | address /www.example.com/1.2.3.4 |
-|ipset-timeout|设置IPSET超时功能启用|auto|[yes]|ipset-timeout yes
+| nameserver | 指定域名使用 server 组解析 | 无 | nameserver /domain/[group\|-], group 为组名，- 表示忽略此规则，配套 server 中的 -group 参数使用 | nameserver /www.example.com/office |
-|domain-rules|设置域名规则|无|domain-rules /domain/ [-rules...]<br>`[-c\|-speed-check-mode]`: 测速模式，参考`speed-check-mode`配置<br>`[-a\|-address]`: 参考`address`配置<br>`[-n\|-nameserver]`: 参考`nameserver`配置<br>`[-p\|-ipset]`:参考`ipset`配置<br>`[-d\|-dualstack-ip-selection]`: 参考`dualstack-ip-selection`|domain-rules /www.example.com/ -speed-check-mode none
+| ipset | 域名 ipset | 无 | ipset /domain/[ipset\|-\|#[4\|6]:[ipset\|-][,#[4\|6]:[ipset\|-]]]，-表示忽略 | ipset /www.example.com/#4:dns4,#6:- |
-|bogus-nxdomain|假冒IP地址过滤|无|[ip/subnet]，可重复| bogus-nxdomain 1.2.3.4/16
+| ipset-timeout | 设置 ipset 超时功能启用  | 自动 | [yes] | ipset-timeout yes |
-|ignore-ip|忽略IP地址|无|[ip/subnet]，可重复| ignore-ip 1.2.3.4/16
+| domain-rules | 设置域名规则 | 无 | domain-rules /domain/ [-rules...]<br>[-c\|-speed-check-mode]：测速模式，参考 speed-check-mode 配置<br>[-a\|-address]：参考 address 配置<br>[-n\|-nameserver]：参考 nameserver 配置<br>[-p\|-ipset]：参考ipset配置<br>[-d\|-dualstack-ip-selection]：参考 dualstack-ip-selection  | domain-rules /www.example.com/ -speed-check-mode none |
-|whitelist-ip|白名单IP地址|无|[ip/subnet]，可重复| whitelist-ip 1.2.3.4/16
+| bogus-nxdomain | 假冒 IP 地址过滤 | 无 | [ip/subnet]，可重复 | bogus-nxdomain 1.2.3.4/16 |
-|blacklist-ip|黑名单IP地址|无|[ip/subnet]，可重复| blacklist-ip 1.2.3.4/16
+| ignore-ip | 忽略 IP 地址 | 无 | [ip/subnet]，可重复 | ignore-ip 1.2.3.4/16 |
-|force-AAAA-SOA|强制AAAA地址返回SOA|no|[yes\|no]|force-AAAA-SOA yes
+| whitelist-ip | 白名单 IP 地址 | 无 | [ip/subnet]，可重复 | whitelist-ip 1.2.3.4/16 |
-|prefetch-domain|域名预先获取功能|no|[yes\|no]|prefetch-domain yes
+| blacklist-ip | 黑名单 IP 地址 | 无 | [ip/subnet]，可重复 | blacklist-ip 1.2.3.4/16 |
-|serve-expired|过期缓存服务功能|no|[yes\|no]，开启此功能后，如果有请求时尝试回应TTL为0的过期记录，并并发查询记录，以避免查询等待|serve-expired yes
+| force-AAAA-SOA | 强制 AAAA 地址返回 SOA | no | [yes\|no] | force-AAAA-SOA yes |
-|serve-expired-ttl|过期缓存服务最长超时时间|0|秒，0：表示停用超时，> 0表示指定的超时的秒数|serve-expired-ttl 0
+| force-qtype-SOA | 强制指定 qtype 返回 SOA | qtype id | [<qtypeid> \| ...] | force-qtype-SOA 65 28
-|serve-expired-reply-ttl|回应的过期缓存TTL|5|秒，0：表示停用超时，> 0表示指定的超时的秒数|serve-expired-reply-ttl 30
+| prefetch-domain | 域名预先获取功能 | no | [yes\|no] | prefetch-domain yes |
-|dualstack-ip-selection|双栈IP优选|no|[yes\|no]|dualstack-ip-selection yes
+| dnsmasq-lease-file | 支持读取dnsmasq dhcp文件解析本地主机名功能 | 无 | dnsmasq dhcp lease文件路径 | dnsmasq-lease-file /var/lib/misc/dnsmasq.leases |
-|dualstack-ip-selection-threshold|双栈IP优选阈值|30ms|毫秒|dualstack-ip-selection-threshold [0-1000]
+| serve-expired | 过期缓存服务功能 | yes | [yes\|no]，开启此功能后，如果有请求时尝试回应 TTL 为 0 的过期记录，并发查询记录，以避免查询等待 |
-|ca-file|证书文件|/etc/ssl/certs/ca-certificates.crt|路径|ca-file /etc/ssl/certs/ca-certificates.crt
+| serve-expired-ttl | 过期缓存服务最长超时时间 | 0 | 秒，0 表示停用超时，大于 0 表示指定的超时的秒数 | serve-expired-ttl 0 |
-|ca-path|证书文件路径|/etc/ssl/certs|路径|ca-path /etc/ssl/certs
+| serve-expired-reply-ttl | 回应的过期缓存 TTL | 5 | 秒，0 表示停用超时，大于 0 表示指定的超时的秒数 | serve-expired-reply-ttl 30 |
+| dualstack-ip-selection | 双栈 IP 优选 | yes | [yes\|no] | dualstack-ip-selection yes |
+| dualstack-ip-selection-threshold | 双栈 IP 优选阈值 | 15ms | 单位为毫秒（ms） | dualstack-ip-selection-threshold [0-1000] |
+| ca-file | 证书文件 | /etc/ssl/certs/ca-certificates.crt | 合法路径字符串 | ca-file /etc/ssl/certs/ca-certificates.crt |
+| ca-path | 证书文件路径 | /etc/ssl/certs | 合法路径字符串 | ca-path /etc/ssl/certs |
 
-## FAQ
+## 常见问题
+
+1. SmartDNS 和 DNSmasq 有什么区别？
+   
+    SmartDNS 在设计上并不是 DNSmasq 的替代品，它的主要功能集中在 DNS 解析增强上，增强部分有：
    
-1. SmartDNS和DNSMASQ有什么区别  
-    SMARTDNS在设计上并不是替换DNSMASQ的，SMARTDNS主要功能集中在DNS解析增强上，增强部分有：
    * 多上游服务器并发请求，对结果进行测速后，返回最佳结果；
-    * address，ipset域名匹配采用高效算法，查询匹配更加快速高效，路由器设备依然高效。
+   * address、ipset 域名匹配采用高效算法，查询匹配更加快速，即使是路由器设备也依然高效；
-    * 域名匹配支持忽略特定域名，可单独匹配IPv4， IPV6，支持多样化定制。
+   * 域名匹配支持忽略特定域名，可单独匹配 IPv4 和 IPv6，支持多样化定制；
    * 针对广告屏蔽功能做增强，返回 SOA，屏蔽广告效果更佳；
-    * IPV4，IPV6双栈IP优选机制，在双网情况下，选择最快的网络通讯。
+   * IPv4、IPv6 双栈 IP 优选机制，在双网情况下，选择最快的网络通讯；
-    * 支持最新的TLS, HTTPS协议，提供安全的DNS查询能力。
+   * 支持最新的 TLS 和 HTTPS 协议，提供安全的 DNS 查询能力；
-    * ECS支持，是查询结果更佳准确。
+   * ECS 支持，使查询结果更佳准确；
-    * IP黑名单，忽略IP机制，使域名查询更佳准确。
+   * IP 黑名单和忽略 IP 机制，使域名查询更佳准确；
-    * 域名预查询，访问常用网站更加快速。
+   * 域名预查询，访问常用网站更加快速；
-    * 域名TTL可指定，使访问更快速。
+   * 域名 TTL 可指定，使访问更快速；
-    * 高速缓存机制，使访问更快速。
+   * 高速缓存机制，使访问更快速；
-    * 异步日志，审计机制，在记录信息的同时不影响DNS查询性能。
+   * 异步日志，审计机制，在记录信息的同时不影响 DNS 查询性能；
-    * 域名组（group）机制，特定域名使用特定上游服务器组查询，避免隐私泄漏。
+   * 域名组（group）机制，特定域名使用特定上游服务器组查询，避免隐私泄漏；
    * 第二 DNS 支持自定义更多行为。
 
-1. 如何配置上游服务器最佳。  
+2. 如何配置上游服务器最佳？
-    smartdns有测速机制，在配置上游服务器时，建议配置多个上游DNS服务器，包含多个不同区域的服务器，但总数建议在10个左右。推荐配置  
+   
+    SmartDNS 有测速机制，在配置上游服务器时，建议配置多个上游 DNS 服务器，包含多个不同区域的服务器，但总数建议在 10 个左右。推荐搭配
+   
    * 运营商 DNS。
    * 国内公共 DNS，如 `119.29.29.29`, `223.5.5.5`。
    * 国外公共 DNS，如 `8.8.8.8`, `8.8.4.4`。
 
-1. 如何启用审计日志  
+3. 如何启用审计日志？
-    审计日志记录客户端请求的域名，记录信息包括，请求时间，请求IP，请求域名，请求类型，如果要启用审计日志，在配置界面配置`audit-enable yes`启用，`audit-size`, `audit-file`, `audit-num`分别配置审计日志文件大小，审计日志文件路径，和审计日志文件个数。审计日志文件将会压缩存储以节省空间。
+   
+    审计日志记录客户端请求的域名，记录信息包括，请求时间，请求 IP，请求域名，请求类型，如果要启用审计日志，在配置界面配置 `audit-enable yes` 启用，`audit-size`、 `audit-file`、`audit-num` 分别配置审计日志文件大小，审计日志文件路径，和审计日志文件个数。审计日志文件将会压缩存储以节省空间。
+
+4. 如何避免隐私泄漏？
+   
+    默认情况下，SmartDNS 会将请求发送到所有配置的DNS服务器，若上游 DNS 服务器使用DNS，或记录日志，将会导致隐私泄漏。为避免隐私泄漏，请尽量：  
    
-1. 如何避免隐私泄漏  
-    smartdns默认情况下，会将请求发送到所有配置的DNS服务器，若上游DNS服务器使用DNS，或记录日志，将会导致隐私泄漏。为避免隐私泄漏，请尽量：  
    * 配置使用可信的DNS服务器。
    * 优先使用 TLS 查询。
    * 设置上游 DNS 服务器组。
 
-1. 如何屏蔽广告  
+5. 如何屏蔽广告？
-    smartdns具备高性能域名匹配算法，通过域名方式过滤广告非常高效，如要屏蔽广告，只需要配置类似如下记录即可，如，屏蔽`*.ad.com`，则配置：
+   
+    SmartDNS 具备高性能域名匹配算法，通过域名方式过滤广告非常高效，如要屏蔽广告，只需要配置类似如下记录即可，如，屏蔽 `*.ad.com`，则配置：
    
    ```sh
    address /ad.com/#
    ```
    
-    域名的使后缀模式，过滤*.ad.com，`#`表示返回SOA，使屏蔽广告更加高效，如果要单独屏蔽IPV4， 或IPV6， 在`#`后面增加数字，如`#4`表示对IPV4生效。若想忽略特定子域名的屏蔽，可配置如下，如忽略`pass.ad.com`，可配置如下：
+    域名的使后缀模式，过滤 `*.ad.com`，`#` 表示返回 SOA，使屏蔽广告更加高效，如果要单独屏蔽 IPv4 或 IPv6， 在 `#` 后面增加数字，如 `#4` 表示对 IPv4 生效。若想忽略特定子域名的屏蔽，如忽略 `pass.ad.com`，可配置如下：
    
    ```sh
    address /pass.ad.com/-
    ```
 
-1. 如何使用DNS查询分流  
+6. 如何使用 DNS 查询分流？
-    某些情况下，需要将有些域名使用特定的DNS服务器来查询来做到DNS分流。比如。
+   
+    某些情况下，需要将有些域名使用特定的 DNS 服务器来查询来做到 DNS 分流。比如
    
    ```sh
-    .home -> 192.168.1.1
+   .home -> 192.168.1.1 # .home 结尾的域名发送到 192.168.1.1 解析
-    .office -> 10.0.0.1
+   .office -> 10.0.0.1  # .office 结尾的域名发送到 10.0.0.1 解析
    ```
    
-    .home 结尾的域名发送到192.168.1.1解析  
-    .office 结尾的域名发送到10.0.0.1解析
     其他域名采用默认的模式解析。
     这种情况的分流配置如下：
    
@@ -614,62 +675,99 @@ https://github.com/pymumu/smartdns/releases
    nameserver /.office/office
    ```
    
-    通过上述配置即可实现DNS解析分流，如果需要实现按请求端端口分流，可以配置第二DNS服务器，bind配置增加--group参数指定分流名称。
+    通过上述配置即可实现 DNS 解析分流，如果需要实现按请求端端口分流，可以配置第二 DNS 服务器，`bind` 配置增加 `--group` 参数指定分流名称。
    
    ```sh
    bind :7053 -group office
    bind :8053 -group home
    ```
 
-1. IPV4, IPV6双栈IP优选功能如何使用  
+7. IPv4、IPv6 双栈 IP 优选功能如何使用？
-    目前IPV6已经开始普及，但IPV6网络在速度上，某些情况下还不如IPV4，为在双栈网络下获得较好的体验，smartdns提供来双栈IP优选机制，同一个域名，若IPV4的速度远快与IPV6，那么smartdns就会阻止IPV6的解析，让PC使用IPV4访问，具体配置文件通过`dualstack-ip-selection yes`启用此功能，通过`dualstack-ip-selection-threshold [time]`来修改阈值。如果要完全禁止IPV6 AAAA记录解析，可设置`force-AAAA-SOA yes`。
+   
+    目前 IPv6 已经开始普及，但 IPv6 网络在速度上，某些情况下还不如 IPv4。为在双栈网络下获得较好的体验，SmartDNS 提供来双栈IP优选机制，同一个域名，若 IPv4 的速度远快与 IPv6，那么 SmartDNS 就会阻止IPv6的解析、使用 IPv4 访问。可在配置文件中通过设置 `dualstack-ip-selection yes` 启用此功能，通过 `dualstack-ip-selection-threshold [time]` 来修改阈值。如果要完全禁止 IPv6 AAAA记录解析，可设置 `force-AAAA-SOA yes`。
+
+8. 如何提高缓存效率，加快访问速度？
+   
+    SmartDNS 提供了域名缓存机制，对查询的域名，进行缓存，缓存时间符合 DNS TTL 规范。为提高缓存命中率，可采用如下措施：  
+   
+   * 适当增大缓存的记录数
      
-1. 如何提高cache效率，加快访问速度  
-    smartdns提供了域名缓存机制，对查询的域名，进行缓存，缓存时间符合DNS TTL规范。为提高缓存命中率，可采用如下措施：  
-    * 适当增大cache的记录数  
      通过 `cache-size` 来设置缓存记录数。  
+     
      查询压力大的环境下，并且有内存大的机器的情况下，可适当调大。  
    
    * 适当设置最小 TTL 值
+     
      通过 `rr-ttl-min` 将最低 DNS TTL 时间设置为一个合理值，延长缓存时间。
+     
      建议是超时时间设置在 10～30 分钟，避免服务器域名变化时，查询到失效域名。
    
    * 开启域名预获取功能
+     
      通过 `prefetch-domain yes` 来启用域名预先获取功能，提高查询命中率。
-    配合上述ttl超时时间，smartdns将在域名ttl即将超时使，再次发送查询请求，并缓存查询结果供后续使用。频繁访问的域名将会持续缓存。此功能将在空闲时消耗更多的CPU。
+     
+     配合上述 TTL 超时时间，SmartDNS 将在域名 TTL 即将超时时，再次发送查询请求，并缓存查询结果供后续使用。频繁访问的域名将会持续缓存。此功能将在空闲时消耗更多的 CPU。
    
    * 过期缓存服务功能  
+     
      通过 `serve-expired` 来启用过期缓存服务功能，可提高缓存命中率的同时，降低CPU占用。
+     
      此功能会在TTL超时后，将返回 TTL=0 给客户端，并且同时再次发送查询请求，并缓存新的结果给后续使用。
 
-1. 第二DNS如何自定义更多行为  
+9. 第二 DNS 如何自定义更多行为？
+   
    第二 DNS 可以作为其他 DNS 服务器的上游，提供更多的查询行为，通过 bind 配置支持可以绑定多个端口，不同端口可设置不同的标志，实现不同的功能，如
    
    ```sh
-    # 绑定 6053端口，6053端口的请求将采用配置office组的上游查询，且不对结果进行测速，忽略address的配置地址。
+   # 绑定 6053 端口，6053 端口的请求将采用配置 office 组的上游查询，且不对结果进行测速，忽略 address 的配置地址
    bind [::]:6053 -no-speed-check -group office -no-rule-addr
    ```
 
+10. DoT 的 SPKI 如何获取？
+    SPKI 可以通过 DNS 服务商发布的页面获取，如果没有发布，可以通过如下命令获取，其中将对应IP地址更换为要获取 SPKI 的 IP 地址。
+
+    ```sh
+    $ echo | openssl s_client -connect '1.0.0.1:853' 2>/dev/null | openssl x509 -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | openssl enc -base64
+    ```
+
+11. iOS系统解析缓慢问题怎么解决？  
+    IOS14开始，苹果支持了DNS HTTPS(TYPE65)记录的解析，此功能用于快速DNS查询和解决HTTPS链接相关的问题，但当前还是草案，另外会导致广告屏蔽等功能失效，建议通过如下配置关闭TYPE65记录查询。
+
+    ```sh
+    force-qtype-SOA 65
+    ```
+
+12. 如何解析本地主机名称？  
+    smartdns可以配合DNSMASQ的dhcp lease文件支持本地主机名->IP地址的解析，可以配置smartdns读取dnsmasq的lease文件，并支持解析。具体配置参数如下，（注意，DNSMASQ lease文件每个系统可能不一样，需要按实际情况配置）
+
+    ```
+    dnsmasq-lease-file /var/lib/misc/dnsmasq.leases
+    ```
+
+    配置完成后，可以直接使用主机名连接对应的机器。但需要注意：
+
+    * Windows系统默认使用mDNS解析地址，如需要在windows下用使用smartdns解析，则需要在主机名后面增加`.`，表示使用DNS解析。如`ping smartdns.`
+
 ## 编译
 
-smartdns包含了编译软件包的脚本，支持编译luci，debian，openwrt，optare安装包，可执行`package/build-pkg.sh`编译。
+  SmartDNS 提供了编译软件包的脚本（`package/build-pkg.sh`），支持编译 LuCI、Debian、OpenWrt 和 Optware 安装包。
 
-## Donate
+## 捐赠
 
-如果你觉得此项目对你有帮助，请捐助我们，以使项目能持续发展，更加完善。
+如果你觉得此项目对你有帮助，请捐助我们，使项目能持续发展和更加完善。
 
-### PayPal
+### PayPal 贝宝
 
 [![Support via PayPal](https://cdn.rawgit.com/twolfson/paypal-github-button/1.0.0/dist/button.svg)](https://paypal.me/PengNick/)
 
-### Alipay 支付宝
+### AliPay 支付宝
 
-![alipay](https://github.com/pymumu/test/releases/download/blob/alipay_donate.jpg)
+![alipay](doc/alipay_donate.jpg)
 
-### Wechat 微信
+### WeChat Pay 微信支付
 
-![wechat](https://github.com/pymumu/test/releases/download/blob/wechat_donate.jpg)
+![wechat](doc/wechat_donate.jpg)
 
 ## 开源声明
 
-Smartdns 基于GPL V3协议开源。
+SmartDNS 基于 GPL V3 协议开源。

ReadMe_en.md

@@ -281,7 +281,7 @@ https://github.com/pymumu/smartdns/releases
 
     * **Check if the service is configured successfully**
 
-        * Method 1: Query domain name with `nslookup -querytype=ptr 0.0.0.1`
+        * Query domain name with `nslookup -querytype=ptr 0.0.0.1`
         See if the `name` item in the command result is displayed as `smartdns` or `hostname`, such as `smartdns`
 
         ```shell
@@ -293,19 +293,13 @@ https://github.com/pymumu/smartdns/releases
         smartdns         name = smartdns.
         ```
 
-        * Method 2: Use `nslookup` to query the `www.baidu.com` domain name to see if the IP address of Baidu in the result is `only one. If there are multiple IP addresses returned, it means that it is not valid. Please try to check several domain names.
+        * or Query doman name `smartdns `with `nslookup smartdns`
-
          ```shell
-        pi@raspberrypi:~ $ nslookup www.baidu.com 192.168.1.1
+         $ nslookup smartdns
-        Server:         192.168.1.1
-        Address:        192.168.1.1#53
-
-        Non-authoritative answer:
-        www.baidu.com   canonical name = www.a.shifen.com.
-        Name:   www.a.shifen.com
-        Address: 14.215.177.38
          ```
 
+        Check whether the command result resolves the IP address of the router, if so, it means it is working.
+
 1. Start Service
 
     Check the `Enable' in the configuration page to start SmartDNS server.
@@ -503,7 +497,9 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |tcp-idle-time|TCP connection idle timeout|120|integer|tcp-idle-time 120
 |rr-ttl|Domain name TTL|Remote query result|number greater than 0|rr-ttl 600
 |rr-ttl-min|Domain name Minimum TTL|Remote query result|number greater than 0|rr-ttl-min 60
+|rr-ttl-reply-max|Domain name Minimum Reply TTL|Remote query result|number greater than 0|rr-ttl-reply-max 60
 |rr-ttl-max|Domain name Maximum TTL|Remote query result|number greater than 0|rr-ttl-max 600
+|max-reply-ip-num|Maximum number of IPs returned to the client|8|number of IPs, 1~16 |max-reply-ip-num 1
 |log-level|log level|error|fatal,error,warn,notice,info,debug|log-level error
 |log-file|log path|/var/log/smartdns.log|File Pah|log-file /var/log/smartdns.log
 |log-size|log size|128K|number+K,M,G|log-size 128K
@@ -517,7 +513,7 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |server-tcp|Upstream TCP DNS server|None|Repeatable <br>`[ip][:port]`: Server IP, port optional. <br>`[-blacklist-ip]`: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". <br>`[-whitelist-ip]`: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. <br>`[-group [group] ...]`: The group to which the DNS server belongs, such as office, foreign, use with nameserver. <br>`[-exclude-default-group]`: Exclude DNS servers from the default group| server-tcp 8.8.8.8:53
 |server-tls|Upstream TLS DNS server|None|Repeatable <br>`[ip][:port]`: Server IP, port optional. <br>`[-spki-pin [sha256-pin]]`: TLS verify SPKI value, a base64 encoded SHA256 hash<br>`[-host-name]`:TLS Server name. <br>`[-tls-host-verify]`: TLS cert hostname to verify. <br>`-no-check-certificate:`: No check certificate. <br>`[-blacklist-ip]`: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". <br>`[-whitelist-ip]`: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. <br>`[-group [group] ...]`: The group to which the DNS server belongs, such as office, foreign, use with nameserver. <br>`[-exclude-default-group]`: Exclude DNS servers from the default group| server-tls 8.8.8.8:853
 |server-https|Upstream HTTPS DNS server|None|Repeatable <br>`https://[host][:port]/path`: Server IP, port optional. <br>`[-spki-pin [sha256-pin]]`: TLS verify SPKI value, a base64 encoded SHA256 hash<br>`[-host-name]`:TLS Server name<br>`[-http-host]`：http header host. <br>`[-tls-host-verify]`: TLS cert hostname to verify. <br>`-no-check-certificate:`: No check certificate. <br>`[-blacklist-ip]`: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". <br>`[-whitelist-ip]`: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. <br>`[-group [group] ...]`: The group to which the DNS server belongs, such as office, foreign, use with nameserver. <br>`[-exclude-default-group]`: Exclude DNS servers from the default group| server-https https://cloudflare-dns.com/dns-query
-|speed-check-mode|Speed ​​mode|None|[ping\|tcp:[80]\|none]|speed-check-mode ping,tcp:443
+|speed-check-mode|Speed ​​mode|None|[ping\|tcp:[80]\|none]|speed-check-mode ping,tcp:80,tcp:443
 |address|Domain IP address|None|address /domain/[ip\|-\|-4\|-6\|#\|#4\|#6], `-` for ignore, `#` for return SOA, `4` for IPV4, `6` for IPV6| address /www.example.com/1.2.3.4
 |nameserver|To query domain with specific server group|None|nameserver /domain/[group\|-], `group` is the group name, `-` means ignore this rule, use the `-group` parameter in the related server|nameserver /www.example.com/office
 |ipset|Domain IPSet|None|ipset /domain/[ipset\|-\|#[4\|6]:[ipset\|-][,#[4\|6]:[ipset\|-]]], `-` for ignore|ipset /www.example.com/#4:dns4,#6:-
@@ -528,12 +524,14 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |whitelist-ip|ip whitelist|None|[ip/subnet], Repeatable，When the filtering server responds IPs in the IP whitelist, only result in whitelist will be accepted| whitelist-ip 1.2.3.4/16
 |blacklist-ip|ip blacklist|None|[ip/subnet], Repeatable，When the filtering server responds IPs in the IP blacklist, The result will be discarded directly| blacklist-ip 1.2.3.4/16
 |force-AAAA-SOA|force AAAA query return SOA|no|[yes\|no]|force-AAAA-SOA yes
+|force-qtype-SOA|force specific qtype return SOA|qtype id|[qtypeid | ...]|force-qtype-SOA 65 28
 |prefetch-domain|domain prefetch feature|no|[yes\|no]|prefetch-domain yes
-|serve-expired|Cache serve expired feature|no|[yes\|no], Attempts to serve old responses from cache with a TTL of 0 in the response without waiting for the actual resolution to finish.|serve-expired yes
+|dnsmasq-lease-file|Support reading dnsmasq dhcp file to resolve local hostname|None|dnsmasq dhcp lease file| dnsmasq-lease-file /var/lib/misc/dnsmasq.leases
+|serve-expired|Cache serve expired feature|yes|[yes\|no], Attempts to serve old responses from cache with a TTL of 0 in the response without waiting for the actual resolution to finish.|serve-expired yes
 |serve-expired-ttl|Cache serve expired limite TTL|0|second，0：disable，> 0  seconds after expiration|serve-expired-ttl 0
 |serve-expired-reply-ttl|TTL value to use when replying with expired data|5|second，0：disable，> 0  seconds after expiration|serve-expired-reply-ttl 30
-|dualstack-ip-selection|Dualstack ip selection|no|[yes\|no]|dualstack-ip-selection yes
+|dualstack-ip-selection|Dualstack ip selection|yes|[yes\|no]|dualstack-ip-selection yes
-|dualstack-ip-selection-threshold|Dualstack ip select threadhold|30ms|millisecond|dualstack-ip-selection-threshold [0-1000]
+|dualstack-ip-selection-threshold|Dualstack ip select threadhold|15ms|millisecond|dualstack-ip-selection-threshold [0-1000]
 |ca-file|certificate file|/etc/ssl/certs/ca-certificates.crt|path|ca-file /etc/ssl/certs/ca-certificates.crt
 |ca-path|certificates path|/etc/ssl/certs|path|ca-path /etc/ssl/certs
 
@@ -646,6 +644,31 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
     bind [::]:6053 -no-speed-check -group office -no-rule-addr
     ```
 
+1. How to get SPKI of DOT  
+    The SPKI can be obtained from the page published by the DNS service provider. If it is not published, it can be obtained by the following command, replace IP with your own IP.
+
+    ```sh
+    echo | openssl s_client -connect '1.0.0.1:853' 2>/dev/null | openssl x509 -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | openssl enc -base64
+    ```
+
+1. How to solve the problem of slow DNS resolution in iOS system?  
+    Since iOS14, Apple has supported the resolution of DNS HTTPS (TYPE65) records. This function is used for solving problems related to HTTPS connections, but it is still a draft, and it will cause some functions such as adblocking fail. It is recommended to disable it through the following configuration.
+
+    ```sh
+    force-qtype-SOA 65
+    ```
+
+1. How to resolve localhost ip by hostname?
+    smartdns can cooperate with the dhcp server of DNSMASQ to support the resolution of local host name to IP address. You can configure smartdns to read the lease file of dnsmasq and support the resolution. The specific configuration parameters are as follows, (note that the DNSMASQ lease file may be different for each system and needs to be configured according to the actual situation)
+
+    ```sh
+    dnsmasq-lease-file /var/lib/misc/dnsmasq.leases
+    ````\
+
+    After the configuration is complete, you can directly use the host name to connect to the local machine. But need to pay attention:
+
+    * Windows system uses mDNS to resolve addresses by default. If you need to use smartdns to resolve addresses under Windows, you need to add `.` after the host name, indicating that DNS resolution is used. Such as `ping smartdns.`
+
 ## Compile
 
 smartdns contains scripts for compiling packages, supports compiling luci, debian, openwrt, opare installation packages, and can execute `package/build-pkg.sh` compilation.

etc/init.d/smartdns

@@ -68,11 +68,23 @@ case $1 in
 			echo "Stop smartdns server failed."
 			exit 1;
 		fi
-		rm -f "$PIDFILE"
+		LOOP=1
+		while true; do
+			if [ ! -d "/proc/$PID" ]; then
+				break;
+			fi
+
+			if [ $LOOP -gt 12 ]; then
+				kill -9 "$PID"
+				break;
+			fi
+			LOOP=$((LOOP+1))
+			sleep .5
+		done
 		echo "Stop smartdns server success."
 		;;
 	restart)
-		"$0" stop && sleep 1 && "$0" start
+		"$0" stop && "$0" start
 		;;
 	status)
 		PID="$(cat "$PIDFILE" 2>/dev/null)"

etc/smartdns/smartdns.conf

@@ -4,6 +4,12 @@
 #   server-name smartdns
 #
 
+# dns server run ser
+# user [username]
+# example: run as nobody
+#   user nobody
+#
+
 # Include another configuration options
 # conf-file [file]
 # conf-file blacklist-ip.conf
@@ -38,7 +44,7 @@ bind [::]:53
 # dns cache size
 # cache-size [number]
 #   0: for no cache
-cache-size 4096
+cache-size 16384
 
 # enable persist cache when restart
 # cache-persist yes
@@ -77,31 +83,42 @@ cache-size 4096
 # speed check mode
 # speed-check-mode [ping|tcp:port|none|,]
 # example:
-#   speed-check-mode ping,tcp:80
+#   speed-check-mode ping,tcp:80,tcp:443
 #   speed-check-mode tcp:443,ping
 #   speed-check-mode none
 
 # force AAAA query return SOA
 # force-AAAA-SOA [yes|no]
 
+# force specific qtype return soa
+# force-qtype-SOA [qtypeid |...]
+# force-qtype-SOA 65 28
+
 # Enable IPV4, IPV6 dual stack IP optimization selection strategy
 # dualstack-ip-selection-threshold [num] (0~1000)
+# dualstack-ip-allow-force-AAAA [yes|no]
 # dualstack-ip-selection [yes|no]
 # dualstack-ip-selection yes
 
 # edns client subnet
 # edns-client-subnet [ip/subnet]
 # edns-client-subnet 192.168.1.1/24
-# edns-client-subnet [8::8]/56
+# edns-client-subnet 8::8/56
 
 # ttl for all resource record
 # rr-ttl: ttl for all record
 # rr-ttl-min: minimum ttl for resource record
 # rr-ttl-max: maximum ttl for resource record
+# tr-ttl-reply-max: maximum reply ttl for resource record
 # example:
 # rr-ttl 300
 # rr-ttl-min 60
 # rr-ttl-max 86400
+# rr-ttl-reply-max 60
+
+# Maximum number of IPs returned to the client|8|number of IPs, 1~16
+# example:
+# max-reply-ip-num 1
 
 # set log level
 # log-level: [level], level=fatal, error, warn, notice, info, debug
@@ -122,6 +139,9 @@ log-level info
 # audit-size 128k
 # audit-num 2
 
+# Support reading dnsmasq dhcp file to resolve local hostname
+# dnsmasq-lease-file /var/lib/misc/dnsmasq.leases
+
 # certificate file
 # ca-file [file]
 # ca-file /etc/ssl/certs/ca-certificates.crt

package/debian/DEBIAN/changelog

@@ -1,4 +1,4 @@
-smartdns (1.2018.7.9) stable; urgency=low
+smartdns (1:1.2022.04.05) stable; urgency=low
 
   * Initial build
 

package/debian/make.sh

@@ -43,7 +43,9 @@ build()
 	mkdir $ROOT/etc/default/ -p
 	mkdir $ROOT/lib/systemd/system/ -p
 
-	sed -i "s/Version:.*/Version: $VER/" $ROOT/DEBIAN/control
+
+	pkgver=$(echo ${VER}| sed 's/^1\.//g')
+	sed -i "s/Version:.*/Version: ${pkgver}/" $ROOT/DEBIAN/control
 	sed -i "s/Architecture:.*/Architecture: $ARCH/" $ROOT/DEBIAN/control
 	chmod 0755 $ROOT/DEBIAN/prerm
 

package/luci-compat/files/luci/i18n/smartdns.zh-cn.po

@@ -104,13 +104,13 @@ msgid "Cache Size"
 msgstr "缓存大小"
 
 msgid "DNS domain result cache size"
-msgstr "缓存DNS的结果，缓存大小，配置零则不缓存"
+msgstr "缓存DNS的结果，缓存大小，配置零则不缓存（单位：条）"
 
 msgid "Domain TTL"
 msgstr "域名TTL"
 
 msgid "TTL for all domain result."
-msgstr "设置所有域名的TTL值"
+msgstr "设置所有域名的TTL值（单位：秒，下同）"
 
 msgid "Domain TTL Min"
 msgstr "域名TTL最小值"
@@ -124,6 +124,9 @@ msgstr "域名TTL最大值"
 msgid "Maximum TTL for all domain result."
 msgstr "设置所有域名的TTL最大值"
 
+msgid "Maximum Reply TTL for all domain result."
+msgstr "设置返回给客户端的TTL最大值"
+
 msgid "smartdns custom settings"
 msgstr "smartdns 自定义设置，具体配置参数参考指导"
 

package/luci-compat/files/luci/model/cbi/smartdns/smartdns.lua

@@ -70,7 +70,7 @@ end
 ---- Support DualStack ip selection
 o = s:taboption("settings", Flag, "dualstack_ip_selection", translate("Dual-stack IP Selection"), translate("Enable IP selection between IPV4 and IPV6"))
 o.rmempty     = false
-o.default     = o.disabled
+o.default     = o.enabled
 o.cfgvalue    = function(...)
     return Flag.cfgvalue(...) or "0"
 end
@@ -87,7 +87,7 @@ end
 o = s:taboption("settings", Flag, "serve_expired", translate("Serve expired"), 
 	translate("Attempts to serve old responses from cache with a TTL of 0 in the response without waiting for the actual resolution to finish."))
 o.rmempty     = false
-o.default     = o.disabled
+o.default     = o.enabled
 o.cfgvalue    = function(...)
     return Flag.cfgvalue(...) or "0"
 end
@@ -112,15 +112,19 @@ o.rempty      = true
 ---- rr-ttl-min
 o = s:taboption("settings", Value, "rr_ttl_min", translate("Domain TTL Min"), translate("Minimum TTL for all domain result."))
 o.rempty      = true
-o.placeholder = "300"
+o.placeholder = "600"
-o.default     = 300
+o.default     = 600
 o.optional    = true
 
----- second dns server
 ---- rr-ttl-max
 o = s:taboption("settings", Value, "rr_ttl_max", translate("Domain TTL Max"), translate("Maximum TTL for all domain result."))
 o.rempty      = true
 
+---- rr-ttl-reply-max
+o = s:taboption("settings", Value, "rr_ttl_reply_max", translate("Domain TTL Max"), translate("Maximum Reply TTL for all domain result."))
+o.rempty      = true
+
+---- second dns server
 ---- Eanble
 o = s:taboption("seconddns", Flag, "seconddns_enabled", translate("Enable"), translate("Enable or disable second DNS server."))
 o.default     = o.disabled

package/luci/files/luci/i18n/smartdns.zh-cn.po

@@ -110,13 +110,13 @@ msgid "Cache Size"
 msgstr "缓存大小"
 
 msgid "DNS domain result cache size"
-msgstr "缓存DNS的结果，缓存大小，配置零则不缓存"
+msgstr "缓存DNS的结果，缓存大小，配置零则不缓存（单位：条）"
 
 msgid "Domain TTL"
 msgstr "域名TTL"
 
 msgid "TTL for all domain result."
-msgstr "设置所有域名的TTL值"
+msgstr "设置所有域名的TTL值（单位：秒，下同）"
 
 msgid "Domain TTL Min"
 msgstr "域名TTL最小值"
@@ -130,6 +130,9 @@ msgstr "域名TTL最大值"
 msgid "Maximum TTL for all domain result."
 msgstr "设置所有域名的TTL最大值"
 
+msgid "Maximum Reply TTL for all domain result."
+msgstr "设置返回给客户端的TTL最大值"
+
 msgid "smartdns custom settings"
 msgstr "smartdns 自定义设置，具体配置参数参考指导"
 

package/luci/files/root/www/luci-static/resources/view/smartdns/smartdns.js

@@ -188,7 +188,7 @@ return L.view.extend({
 		o = s.taboption("settings", form.Flag, "dualstack_ip_selection", _("Dual-stack IP Selection"),
 			_("Enable IP selection between IPV4 and IPV6"));
 		o.rmempty = false;
-		o.default = o.disabled;
+		o.default = o.enabled;
 
 		// Domain prefetch load ;
 		o = s.taboption("settings", form.Flag, "prefetch_domain", _("Domain prefetch"),
@@ -200,7 +200,7 @@ return L.view.extend({
 		o = s.taboption("settings", form.Flag, "serve_expired", _("Serve expired"),
 			_("Attempts to serve old responses from cache with a TTL of 0 in the response without waiting for the actual resolution to finish."));
 		o.rmempty = false;
-		o.default = o.disabled;
+		o.default = o.enabled;
 
 		// Redirect;
 		o = s.taboption("settings", form.ListValue, "redirect", _("Redirect"), _("SmartDNS redirect mode"));
@@ -223,16 +223,21 @@ return L.view.extend({
 		o = s.taboption("settings", form.Value, "rr_ttl_min", _("Domain TTL Min"),
 			_("Minimum TTL for all domain result."));
 		o.rempty = true;
-		o.placeholder = "300";
+		o.placeholder = "600";
-		o.default = 300;
+		o.default = 600;
 		o.optional = true;
 
-		// second dns server;
 		// rr-ttl-max;
 		o = s.taboption("settings", form.Value, "rr_ttl_max", _("Domain TTL Max"),
 		_("Maximum TTL for all domain result."));
 		o.rempty = true;
 
+		// rr-ttl-reply-max;
+		o = s.taboption("settings", form.Value, "rr_ttl_reply_max", _("Domain Reply TTL Max"),
+		_("Maximum Reply TTL for all domain result."));
+		o.rempty = true;
+		
+		// second dns server;
 		// Eanble;
 		o = s.taboption("seconddns", form.Flag, "seconddns_enabled", _("Enable"),
 			_("Enable or disable second DNS server."));

package/openwrt/files/etc/init.d/smartdns

@@ -289,7 +289,7 @@ load_service()
 		fi
 	}
 	config_get dualstack_ip_selection "$section" "dualstack_ip_selection" "0"
-	[ "$dualstack_ip_selection" = "1" ] && conf_append "dualstack-ip-selection" "yes"
+	[ "$dualstack_ip_selection" = "0" ] && conf_append "dualstack-ip-selection" "no"
 
 	config_get prefetch_domain "$section" "prefetch_domain" "0"
 	[ "$prefetch_domain" = "1" ] && conf_append "prefetch-domain" "yes"
@@ -311,6 +311,9 @@ load_service()
 	config_get rr_ttl_max "$section" "rr_ttl_max" ""
 	[ -z "$rr_ttl_max" ] || conf_append "rr-ttl-max" "$rr_ttl_max"
 
+	config_get rr_ttl_reply_max "$section" "rr_ttl_reply_max" ""
+	[ -z "$rr_ttl_reply_max" ] || conf_append "rr-ttl-reply-max" "$rr_ttl_reply_max"
+
 	config_get log_size "$section" "log_size" "64K"
 	[ -z "$log_size" ] || conf_append "log-size" "$log_size"
 
@@ -374,6 +377,7 @@ load_service()
 	procd_set_param command /usr/sbin/smartdns -f -c $SMARTDNS_CONF $args
 	[ "$RESPAWN" = "1" ] &&	procd_set_param respawn ${respawn_threshold:-3600} ${respawn_timeout:-5} ${respawn_retry:-5}
 	procd_set_param file "$SMARTDNS_CONF"
+	procd_set_param term_timeout 60
 	procd_close_instance
 }
 

package/optware/S50smartdns

@@ -339,7 +339,7 @@ case "$1" in
 		SLEEP="sleep"
 		SLEEPTIME=0.2
 	fi
-	N=30
+	N=300
 	while [ $N -gt 0 ]
 	do
 		pid="$(cat "$SMARTDNS_PID" | head -n 1 2>/dev/null)"
@@ -348,7 +348,13 @@ case "$1" in
 		fi
 
 		if [ ! -d "/proc/$pid" ]; then
-			return 0;
+			return 0
+		fi
+
+		stat="$(cat /proc/${pid}/stat | awk '{print $3}' 2>/dev/null)"
+		if [ "$stat" = "Z" ]; then
+			$SLEEP $SLEEPTIME
+			return 0
 		fi
 
 		$SLEEP $SLEEPTIME 2>/dev/null

src/.gitignore

@@ -0,0 +1,5 @@
+.vscode
+.o
+.DS_Store
+.swp.
+smartdns

src/Makefile

@@ -20,7 +20,7 @@ OBJS=smartdns.o fast_ping.o dns_client.o dns_server.o dns.o util.o tlog.o dns_co
 
 # cflags
 ifndef CFLAGS
-CFLAGS =-O2 -g -Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing 
+CFLAGS =-O2 -g -Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing -funwind-tables -Wmissing-prototypes -Wshadow -Wextra -Wno-unused-parameter -Wno-implicit-fallthrough
 endif
 override CFLAGS +=-Iinclude
 override CFLAGS += -DBASE_FILE_NAME=\"$(notdir $<)\"
@@ -35,7 +35,7 @@ override CXXFLAGS +=-Iinclude
 ifeq ($(STATIC), yes)
 override LDFLAGS += -lssl -lcrypto -Wl,--whole-archive -lpthread -Wl,--no-whole-archive -ldl -static
 else
-override LDFLAGS += -lssl -lcrypto -lpthread 
+override LDFLAGS += -lssl -lcrypto -lpthread -ldl
 endif
 
 .PHONY: all clean

src/dns.h

@@ -23,13 +23,18 @@
 #define DNS_RR_AAAA_LEN 16
 #define DNS_MAX_CNAME_LEN 256
 #define DNS_MAX_OPT_LEN 256
-#define DNS_IN_PACKSIZE (512 * 4)
+#define DNS_IN_PACKSIZE (512 * 8)
-#define DNS_PACKSIZE (512 * 10)
+#define DNS_PACKSIZE (512 * 12)
 #define DNS_DEFAULT_PACKET_SIZE 512
 
 #define DNS_ADDR_FAMILY_IP 1
 #define DNS_ADDR_FAMILY_IPV6 2
 
+/*
+DNS parameters:
+https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
+*/
+
 typedef enum dns_qr {
 	DNS_QR_QUERY = 0,
 	DNS_QR_ANSWER = 1,
@@ -61,6 +66,7 @@ typedef enum dns_type {
 	DNS_T_SRV = 33,
 	DNS_T_OPT = 41,
 	DNS_T_SSHFP = 44,
+	DNS_T_HTTPS = 65,
 	DNS_T_SPF = 99,
 	DNS_T_AXFR = 252,
 	DNS_T_ALL = 255
@@ -68,6 +74,7 @@ typedef enum dns_type {
 
 typedef enum dns_opt_code {
 	DNS_OPT_T_ECS = 8, // OPT ECS
+	DNS_OPT_T_COOKIE = 10, //OPT Cookie
 	DNS_OPT_T_TCP_KEEPALIVE = 11,
 	DNS_OPT_T_ALL = 255
 } dns_opt_code_t;
@@ -112,11 +119,15 @@ struct dns_head {
 	unsigned short nrcount; /* number of addititional resource entries */
 } __attribute__((packed, aligned(2)));
 
-struct dns_rrs {
+#define DNS_PACKET_DICT_SIZE 16
-	unsigned short next;
+struct dns_packet_dict_item {
-	unsigned short len;
+	unsigned short pos;
-	dns_type_t type;
+	unsigned int hash;
-	unsigned char data[0];
+};
+
+struct dns_packet_dict {
+	short dict_count;
+	struct dns_packet_dict_item names[DNS_PACKET_DICT_SIZE];
 };
 
 /* packet haed */
@@ -129,23 +140,26 @@ struct dns_packet {
 	unsigned short optcount;
 	unsigned short optional;
 	unsigned short payloadsize;
+	struct dns_packet_dict namedict;
 	int size;
 	int len;
 	unsigned char data[0];
 };
 
-/* RRS encode/decode context */
+struct dns_rrs {
-struct dns_data_context {
+	struct dns_packet *packet;
-	unsigned char *data;
+	unsigned short next;
-	unsigned char *ptr;
+	unsigned short len;
-	unsigned int maxsize;
+	int type;
+	unsigned char data[0];
 };
 
 /* packet encode/decode context */
 struct dns_context {
 	struct dns_packet *packet;
+	struct dns_packet_dict *namedict;
 	unsigned char *data;
-	unsigned int maxsize;
+	int maxsize;
 	unsigned char *ptr;
 };
 
@@ -169,6 +183,13 @@ struct dns_opt_ecs {
 	unsigned char source_prefix;
 	unsigned char scope_prefix;
 	unsigned char addr[DNS_RR_AAAA_LEN];
+} __attribute__((packed));;
+
+/* OPT COOLIE */
+struct dns_opt_cookie {
+	char server_cookie_len;
+	unsigned char client_cookie[8];
+	unsigned char server_cookie[32];
 };
 
 /* OPT */
@@ -184,29 +205,29 @@ struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, dns_rr_type type, i
 /*
  * Question
  */
-int dns_add_domain(struct dns_packet *packet, char *domain, int qtype, int qclass);
+int dns_add_domain(struct dns_packet *packet, const char *domain, int qtype, int qclass);
 int dns_get_domain(struct dns_rrs *rrs, char *domain, int maxsize, int *qtype, int *qclass);
 
 /*
  * Answers
  */
-int dns_add_CNAME(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname);
+int dns_add_CNAME(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl, const char *cname);
 int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size);
 
-int dns_add_A(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, unsigned char addr[DNS_RR_A_LEN]);
+int dns_add_A(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl, unsigned char addr[DNS_RR_A_LEN]);
 int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[DNS_RR_A_LEN]);
 
-int dns_add_PTR(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname);
+int dns_add_PTR(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl, char *cname);
 int dns_get_PTR(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size);
 
-int dns_add_AAAA(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl,
+int dns_add_AAAA(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl,
 				 unsigned char addr[DNS_RR_AAAA_LEN]);
 int dns_get_AAAA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[DNS_RR_AAAA_LEN]);
 
-int dns_add_SOA(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, struct dns_soa *soa);
+int dns_add_SOA(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl, struct dns_soa *soa);
 int dns_get_SOA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, struct dns_soa *soa);
 
-int dns_add_NS(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname);
+int dns_add_NS(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl, const char *cname);
 int dns_get_NS(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size);
 
 int dns_set_OPT_payload_size(struct dns_packet *packet, int payload_size);
@@ -226,4 +247,12 @@ int dns_encode(unsigned char *data, int size, struct dns_packet *packet);
 
 int dns_packet_init(struct dns_packet *packet, int size, struct dns_head *head);
 
+struct dns_update_param {
+	int id;
+	int ip_ttl;
+	int cname_ttl;
+};
+
+int dns_packet_update(unsigned char *data, int size, struct dns_update_param *param);
+
 #endif

src/dns_cache.c

@@ -162,6 +162,11 @@ void dns_cache_set_data_soa(struct dns_cache_data *dns_cache, int32_t cache_flag
 		goto errout;
 	}
 
+	dns_cache->head.is_soa = 1;
+	if (dns_cache->head.cache_type == CACHE_TYPE_PACKET) {
+		return;
+	}
+
 	struct dns_cache_addr *cache_addr = (struct dns_cache_addr *)dns_cache;
 	if (cache_addr == NULL) {
 		goto errout;
@@ -229,6 +234,7 @@ struct dns_cache_data *dns_cache_new_data_packet(uint32_t cache_flag, void *pack
 	}
 
 	memcpy(cache_packet->data, packet, packet_len);
+	memset(&cache_packet->head, 0, sizeof(cache_packet->head));
 
 	cache_packet->head.cache_flag = cache_flag;
 	cache_packet->head.cache_type = CACHE_TYPE_PACKET;
@@ -237,7 +243,8 @@ struct dns_cache_data *dns_cache_new_data_packet(uint32_t cache_flag, void *pack
 	return (struct dns_cache_data *)cache_packet;
 }
 
-int dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data)
+static int _dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, int inactive,
+							  struct dns_cache_data *cache_data)
 {
 	struct dns_cache *dns_cache = NULL;
 	struct dns_cache_data *old_cache_data = NULL;
@@ -263,11 +270,19 @@ int dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, struct
 	dns_cache->info.qtype = qtype;
 	dns_cache->info.ttl = ttl;
 	dns_cache->info.speed = speed;
-	time(&dns_cache->info.insert_time);
 	old_cache_data = dns_cache->cache_data;
 	dns_cache->cache_data = cache_data;
 	list_del_init(&dns_cache->list);
+
+	if (inactive == 0) {
+		time(&dns_cache->info.insert_time);
+		time(&dns_cache->info.replace_time);
 		list_add_tail(&dns_cache->list, &dns_cache_head.cache_list);
+	} else {
+		time(&dns_cache->info.replace_time);
+		list_add_tail(&dns_cache->list, &dns_cache_head.inactive_list);
+	}
+
 	pthread_mutex_unlock(&dns_cache_head.lock);
 
 	dns_cache_data_free(old_cache_data);
@@ -275,18 +290,48 @@ int dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, struct
 	return 0;
 }
 
-int _dns_cache_insert(struct dns_cache_info *info, struct dns_cache_data *cache_data, struct list_head *head)
+int dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data)
+{
+	return _dns_cache_replace(domain, ttl, qtype, speed, 0, cache_data);
+}
+
+int dns_cache_replace_inactive(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data)
+{
+	return _dns_cache_replace(domain, ttl, qtype, speed, 1, cache_data);
+}
+
+static void _dns_cache_remove_by_domain(const char *domain, dns_type_t qtype)
+{
+	uint32_t key = 0;
+	struct dns_cache *dns_cache = NULL;
+
+	key = hash_string(domain);
+	key = jhash(&qtype, sizeof(qtype), key);
+	pthread_mutex_lock(&dns_cache_head.lock);
+	hash_for_each_possible(dns_cache_head.cache_hash, dns_cache, node, key)
+	{
+		if (dns_cache->info.qtype != qtype) {
+			continue;
+		}
+
+		if (strncmp(domain, dns_cache->info.domain, DNS_MAX_CNAME_LEN) != 0) {
+			continue;
+		}
+
+		_dns_cache_remove(dns_cache);
+		break;
+	}
+
+	pthread_mutex_unlock(&dns_cache_head.lock);
+}
+
+static int _dns_cache_insert(struct dns_cache_info *info, struct dns_cache_data *cache_data, struct list_head *head)
 {
 	uint32_t key = 0;
 	struct dns_cache *dns_cache = NULL;
 
 	/* if cache already exists, free */
-	dns_cache = dns_cache_lookup(info->domain, info->qtype);
+	_dns_cache_remove_by_domain(info->domain, info->qtype);
-	if (dns_cache) {
-		dns_cache_delete(dns_cache);
-		dns_cache_release(dns_cache);
-		dns_cache = NULL;
-	}
 
 	dns_cache = malloc(sizeof(*dns_cache));
 	if (dns_cache == NULL) {
@@ -307,7 +352,7 @@ int _dns_cache_insert(struct dns_cache_info *info, struct dns_cache_data *cache_
 
 	/* Release extra cache, remove oldest cache record */
 	if (atomic_inc_return(&dns_cache_head.num) > dns_cache_head.size) {
-		struct dns_cache *del_cache;
+		struct dns_cache *del_cache = NULL;
 		del_cache = _dns_inactive_cache_first();
 		if (del_cache) {
 			_dns_cache_remove(del_cache);
@@ -348,6 +393,7 @@ int dns_cache_insert(char *domain, int ttl, dns_type_t qtype, int speed, struct
 	info.hitnum_update_add = DNS_CACHE_HITNUM_STEP;
 	info.speed = speed;
 	time(&info.insert_time);
+	time(&info.replace_time);
 
 	return _dns_cache_insert(&info, cache_data, &dns_cache_head.cache_list);
 }
@@ -357,7 +403,7 @@ struct dns_cache *dns_cache_lookup(char *domain, dns_type_t qtype)
 	uint32_t key = 0;
 	struct dns_cache *dns_cache = NULL;
 	struct dns_cache *dns_cache_ret = NULL;
-	time_t now;
+	time_t now = 0;
 
 	if (dns_cache_head.size <= 0) {
 		return NULL;
@@ -400,7 +446,7 @@ struct dns_cache *dns_cache_lookup(char *domain, dns_type_t qtype)
 
 int dns_cache_get_ttl(struct dns_cache *dns_cache)
 {
-	time_t now;
+	time_t now = 0;
 	int ttl = 0;
 	time(&now);
 
@@ -412,15 +458,45 @@ int dns_cache_get_ttl(struct dns_cache *dns_cache)
 	return ttl;
 }
 
-int dns_cache_is_soa(struct dns_cache *dns_cache) {
+int dns_cache_get_cname_ttl(struct dns_cache *dns_cache)
+{
+	time_t now = 0;
+	int ttl = 0;
+	time(&now);
+
+	struct dns_cache_addr *cache_addr = (struct dns_cache_addr *)dns_cache_get_data(dns_cache);
+
+	if (cache_addr->head.cache_type != CACHE_TYPE_ADDR) {
+		return 0;
+	}
+
+	ttl = dns_cache->info.insert_time + cache_addr->addr_data.cname_ttl - now;
+	if (ttl < 0) {
+		return 0;
+	}
+
+	int addr_ttl = dns_cache_get_ttl(dns_cache);
+	if (ttl < addr_ttl && ttl < 0) {
+		return addr_ttl;
+	}
+
+	if (ttl < 0) {
+		return 0;
+	}
+
+	return ttl;
+}
+
+int dns_cache_is_soa(struct dns_cache *dns_cache)
+{
 	if (dns_cache == NULL) {
 		return 0;
 	}
 
-	struct dns_cache_addr *cache_addr = (struct dns_cache_addr *)dns_cache_get_data(dns_cache);
+	if (dns_cache->cache_data->head.is_soa) {
-	if (cache_addr->addr_data.soa) {
 		return 1;
 	}
+
 	return 0;
 }
 
@@ -466,12 +542,16 @@ void dns_cache_update(struct dns_cache *dns_cache)
 	pthread_mutex_unlock(&dns_cache_head.lock);
 }
 
-void _dns_cache_remove_expired_ttl(time_t *now)
+static void _dns_cache_remove_expired_ttl(dns_cache_callback inactive_precallback, int ttl_inactive_pre,
+										  unsigned int max_callback_num, const time_t *now)
 {
 	struct dns_cache *dns_cache = NULL;
-	struct dns_cache *tmp;
+	struct dns_cache *tmp = NULL;
+	unsigned int callback_num = 0;
 	int ttl = 0;
+	LIST_HEAD(checklist);
 
+	pthread_mutex_lock(&dns_cache_head.lock);
 	list_for_each_entry_safe(dns_cache, tmp, &dns_cache_head.inactive_list, list)
 	{
 		ttl = dns_cache->info.insert_time + dns_cache->info.ttl - *now;
@@ -479,21 +559,55 @@ void _dns_cache_remove_expired_ttl(time_t *now)
 			continue;
 		}
 
-		if (dns_cache_head.inactive_list_expired + ttl > 0) {
+		if (dns_cache_head.inactive_list_expired + ttl < 0) {
+			_dns_cache_remove(dns_cache);
 			continue;
 		}
 
-		_dns_cache_remove(dns_cache);
+		ttl = *now - dns_cache->info.replace_time;
+		if (ttl < ttl_inactive_pre || inactive_precallback == NULL) {
+			continue;
+		}
+
+		if (callback_num >= max_callback_num) {
+			continue;
+		}
+
+		if (dns_cache->del_pending == 1) {
+			continue;
+		}
+
+		/* If the TTL time is in the pre-timeout range, call callback function */
+		dns_cache_get(dns_cache);
+		list_add_tail(&dns_cache->check_list, &checklist);
+		dns_cache->del_pending = 1;
+		callback_num++;
+	}
+	pthread_mutex_unlock(&dns_cache_head.lock);
+
+	list_for_each_entry_safe(dns_cache, tmp, &checklist, check_list)
+	{
+		/* run inactive_precallback */
+		if (inactive_precallback) {
+			inactive_precallback(dns_cache);
+		}
+		dns_cache_release(dns_cache);
 	}
 }
 
-void dns_cache_invalidate(dns_cache_preinvalid_callback callback, int ttl_pre)
+void dns_cache_invalidate(dns_cache_callback precallback, int ttl_pre, unsigned int max_callback_num,
+						  dns_cache_callback inactive_precallback, int ttl_inactive_pre)
 {
 	struct dns_cache *dns_cache = NULL;
-	struct dns_cache *tmp;
+	struct dns_cache *tmp = NULL;
-	time_t now;
+	time_t now = 0;
 	int ttl = 0;
 	LIST_HEAD(checklist);
+	unsigned int callback_num = 0;
+
+	if (max_callback_num <= 0) {
+		max_callback_num = -1;
+	}
 
 	if (dns_cache_head.size <= 0) {
 		return;
@@ -506,35 +620,36 @@ void dns_cache_invalidate(dns_cache_preinvalid_callback callback, int ttl_pre)
 		ttl = dns_cache->info.insert_time + dns_cache->info.ttl - now;
 		if (ttl > 0 && ttl < ttl_pre) {
 			/* If the TTL time is in the pre-timeout range, call callback function */
-			if (callback && dns_cache->del_pending == 0) {
+			if (precallback && dns_cache->del_pending == 0 && callback_num < max_callback_num) {
 				list_add_tail(&dns_cache->check_list, &checklist);
 				dns_cache_get(dns_cache);
 				dns_cache->del_pending = 1;
+				callback_num++;
 				continue;
 			}
 		}
 
 		if (ttl < 0) {
-			if (dns_cache_head.enable_inactive && (dns_cache_is_soa(dns_cache) == 0)) {
+			if (dns_cache_head.enable_inactive) {
 				_dns_cache_move_inactive(dns_cache);
 			} else {
 				_dns_cache_remove(dns_cache);
 			}
 		}
 	}
+	pthread_mutex_unlock(&dns_cache_head.lock);
 
 	if (dns_cache_head.enable_inactive && dns_cache_head.inactive_list_expired != 0) {
-		_dns_cache_remove_expired_ttl(&now);
+		_dns_cache_remove_expired_ttl(inactive_precallback, ttl_inactive_pre, max_callback_num, &now);
 	}
 
-	pthread_mutex_unlock(&dns_cache_head.lock);
-
 	list_for_each_entry_safe(dns_cache, tmp, &checklist, check_list)
 	{
 		/* run callback */
-		if (callback) {
+		if (precallback) {
-			callback(dns_cache);
+			precallback(dns_cache);
 		}
+		list_del(&dns_cache->check_list);
 		dns_cache_release(dns_cache);
 	}
 }
@@ -542,8 +657,8 @@ void dns_cache_invalidate(dns_cache_preinvalid_callback callback, int ttl_pre)
 static int _dns_cache_read_record(int fd, uint32_t cache_number)
 {
 
-	int i = 0;
+	unsigned int i = 0;
-	int ret = 0;
+	ssize_t ret = 0;
 	struct dns_cache_record cache_record;
 	struct dns_cache_data_head data_head;
 	struct dns_cache_data *cache_data = NULL;
@@ -611,12 +726,18 @@ errout:
 int dns_cache_load(const char *file)
 {
 	int fd = -1;
-	int ret = 0;
+	ssize_t ret = 0;
+	off_t filesize = 0;
+
 	fd = open(file, O_RDONLY);
 	if (fd < 0) {
 		return 0;
 	}
 
+	filesize = lseek(fd, 0, SEEK_END);
+	lseek(fd, 0, SEEK_SET);
+	posix_fadvise(fd, 0, filesize, POSIX_FADV_WILLNEED | POSIX_FADV_SEQUENTIAL);
+
 	struct dns_cache_file cache_file;
 	ret = read(fd, &cache_file, sizeof(cache_file));
 	if (ret != sizeof(cache_file)) {
@@ -629,11 +750,12 @@ int dns_cache_load(const char *file)
 		goto errout;
 	}
 
-	if (strncmp(cache_file.version, __TIMESTAMP__, DNS_CACHE_VERSION_LEN) != 0) {
+	if (strncmp(cache_file.version, __TIMESTAMP__, DNS_CACHE_VERSION_LEN - 1) != 0) {
 		tlog(TLOG_WARN, "cache version is different, skip load cache.");
 		goto errout;
 	}
 
+	tlog(TLOG_INFO, "load cache file %s, total %d records", file, cache_file.cache_number);
 	if (_dns_cache_read_record(fd, cache_file.cache_number) != 0) {
 		goto errout;
 	}
@@ -660,7 +782,7 @@ static int _dns_cache_write_record(int fd, uint32_t *cache_number, enum CACHE_RE
 		cache_record.magic = MAGIC_CACHE_DATA;
 		cache_record.type = type;
 		memcpy(&cache_record.info, &dns_cache->info, sizeof(struct dns_cache_info));
-		int ret = write(fd, &cache_record, sizeof(cache_record));
+		ssize_t ret = write(fd, &cache_record, sizeof(cache_record));
 		if (ret != sizeof(cache_record)) {
 			tlog(TLOG_ERROR, "write cache failed, %s", strerror(errno));
 			goto errout;
@@ -668,7 +790,7 @@ static int _dns_cache_write_record(int fd, uint32_t *cache_number, enum CACHE_RE
 
 		struct dns_cache_data *cache_data = dns_cache->cache_data;
 		ret = write(fd, cache_data, sizeof(*cache_data) + cache_data->head.size);
-		if (ret != sizeof(*cache_data) + cache_data->head.size) {
+		if (ret != (int)sizeof(*cache_data) + cache_data->head.size) {
 			tlog(TLOG_ERROR, "write cache data failed, %s", strerror(errno));
 			goto errout;
 		}
@@ -752,7 +874,8 @@ errout:
 void dns_cache_destroy(void)
 {
 	struct dns_cache *dns_cache = NULL;
-	struct dns_cache *tmp;
+	struct dns_cache *tmp = NULL;
+
 	pthread_mutex_lock(&dns_cache_head.lock);
 	list_for_each_entry_safe(dns_cache, tmp, &dns_cache_head.inactive_list, list)
 	{

src/dns_cache.h

@@ -50,7 +50,8 @@ enum CACHE_RECORD_TYPE {
 struct dns_cache_data_head {
 	uint32_t cache_flag;
 	enum CACHE_TYPE cache_type;
-	size_t size;
+	int is_soa;
+	ssize_t size;
 };
 
 struct dns_cache_data {
@@ -62,8 +63,8 @@ struct dns_cache_addr {
 	struct dns_cache_data_head head;
 	struct dns_cache_addr_data {
 		unsigned int cname_ttl;
-		char cname[DNS_MAX_CNAME_LEN];
 		char soa;
+		char cname[DNS_MAX_CNAME_LEN];
 		union {
 			unsigned char ipv4_addr[DNS_RR_A_LEN];
 			unsigned char ipv6_addr[DNS_RR_AAAA_LEN];
@@ -84,6 +85,7 @@ struct dns_cache_info {
 	int speed;
 	int hitnum_update_add;
 	time_t insert_time;
+	time_t replace_time;
 	dns_type_t qtype;
 };
 
@@ -123,6 +125,8 @@ int dns_cache_init(int size, int enable_inactive, int inactive_list_expired);
 
 int dns_cache_replace(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data);
 
+int dns_cache_replace_inactive(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data);
+
 int dns_cache_insert(char *domain, int ttl, dns_type_t qtype, int speed, struct dns_cache_data *cache_data);
 
 struct dns_cache *dns_cache_lookup(char *domain, dns_type_t qtype);
@@ -137,12 +141,15 @@ int dns_cache_hitnum_dec_get(struct dns_cache *dns_cache);
 
 void dns_cache_update(struct dns_cache *dns_cache);
 
-typedef void dns_cache_preinvalid_callback(struct dns_cache *dns_cache);
+typedef void dns_cache_callback(struct dns_cache *dns_cache);
 
-void dns_cache_invalidate(dns_cache_preinvalid_callback callback, int ttl_pre);
+void dns_cache_invalidate(dns_cache_callback precallback, int ttl_pre, unsigned int max_callback_num,
+						  dns_cache_callback inactive_precallback, int ttl_inactive_pre);
 
 int dns_cache_get_ttl(struct dns_cache *dns_cache);
 
+int dns_cache_get_cname_ttl(struct dns_cache *dns_cache);
+
 int dns_cache_is_soa(struct dns_cache *dns_cache);
 
 struct dns_cache_data *dns_cache_new_data(void);

src/dns_client.h

@@ -47,17 +47,41 @@ typedef enum dns_result_type {
 #define DNSSERVER_FLAG_CHECK_EDNS (0x1 << 2)
 #define DNSSERVER_FLAG_CHECK_TTL (0x1 << 3)
 
+#define DNS_QUEY_OPTION_ECS_DNS (1 << 0)
+#define DNS_QUEY_OPTION_ECS_IP (1 << 1)
+
 int dns_client_init(void);
 
 int dns_client_set_ecs(char *ip, int subnet);
 
+struct dns_server_info;
 /* query result notify function */
-typedef int (*dns_client_callback)(char *domain, dns_result_type rtype, unsigned int result_flag,
+typedef int (*dns_client_callback)(const char *domain, dns_result_type rtype, struct dns_server_info *server_info,
 								   struct dns_packet *packet, unsigned char *inpacket, int inpacket_len,
 								   void *user_ptr);
 
+unsigned int dns_client_server_result_flag(struct dns_server_info *server_info);
+
+const char *dns_client_get_server_ip(struct dns_server_info *server_info);
+
+int dns_client_get_server_port(struct dns_server_info *server_info);
+
+dns_server_type_t dns_client_get_server_type(struct dns_server_info *server_info);
+
+struct dns_query_ecs_ip {
+	char ip[DNS_MAX_CNAME_LEN];
+	int subnet;
+};
+
+struct dns_query_options {
+	unsigned long long enable_flag;
+	struct dns_opt_ecs ecs_dns;
+	struct dns_query_ecs_ip ecs_ip;
+};
+
 /* query domain */
-int dns_client_query(char *domain, int qtype, dns_client_callback callback, void *user_ptr, const char *group_name);
+int dns_client_query(const char *domain, int qtype, dns_client_callback callback, void *user_ptr, const char *group_name,
+					 struct dns_query_options *options);
 
 void dns_client_exit(void);
 
@@ -104,13 +128,13 @@ int dns_client_add_server(char *server_ip, int port, dns_server_type_t server_ty
 /* remove remote dns server */
 int dns_client_remove_server(char *server_ip, int port, dns_server_type_t server_type);
 
-int dns_client_add_group(char *group_name);
+int dns_client_add_group(const char *group_name);
 
-int dns_client_add_to_group(char *group_name, char *server_ip, int port, dns_server_type_t server_type);
+int dns_client_add_to_group(const char *group_name, char *server_ip, int port, dns_server_type_t server_type);
 
-int dns_client_remove_from_group(char *group_name, char *server_ip, int port, dns_server_type_t server_type);
+int dns_client_remove_from_group(const char *group_name, char *server_ip, int port, dns_server_type_t server_type);
 
-int dns_client_remove_group(char *group_name);
+int dns_client_remove_group(const char *group_name);
 
 int dns_server_num(void);
 

src/dns_conf.c

@@ -21,6 +21,7 @@
 #include "rbtree.h"
 #include "tlog.h"
 #include "util.h"
+#include <errno.h>
 #include <getopt.h>
 #include <libgen.h>
 #include <stdio.h>
@@ -30,6 +31,7 @@
 #include <unistd.h>
 
 #define DEFAULT_DNS_CACHE_SIZE 512
+#define DNS_MAX_REPLY_IP_NUM 8
 
 /* ipset */
 struct dns_ipset_table {
@@ -37,31 +39,48 @@ struct dns_ipset_table {
 };
 static struct dns_ipset_table dns_ipset_table;
 
+struct dns_qtype_soa_table dns_qtype_soa_table;
+
 /* dns groups */
 struct dns_group_table dns_group_table;
 
+struct dns_ptr_table dns_ptr_table;
+
+static char dns_conf_dnsmasq_lease_file[DNS_MAX_PATH];
+static time_t dns_conf_dnsmasq_lease_file_time;
+
+struct dns_hosts_table dns_hosts_table;
+int dns_hosts_record_num;
+
 /* server ip/port  */
 struct dns_bind_ip dns_conf_bind_ip[DNS_MAX_BIND_IP];
 int dns_conf_bind_ip_num = 0;
 int dns_conf_tcp_idle_time = 120;
 
+int dns_conf_max_reply_ip_num = DNS_MAX_REPLY_IP_NUM;
+
 /* cache */
 int dns_conf_cachesize = DEFAULT_DNS_CACHE_SIZE;
 int dns_conf_prefetch = 0;
-int dns_conf_serve_expired = 0;
+int dns_conf_serve_expired = 1;
-int dns_conf_serve_expired_ttl = 0;
+int dns_conf_serve_expired_ttl = 24 * 3600; /* 1 day */
-int dns_conf_serve_expired_reply_ttl = 5;
+int dns_conf_serve_expired_prefetch_time;
+int dns_conf_serve_expired_reply_ttl = 3;
 
 /* upstream servers */
 struct dns_servers dns_conf_servers[DNS_MAX_SERVERS];
 char dns_conf_server_name[DNS_MAX_SERVER_NAME_LEN];
 int dns_conf_server_num;
 
-struct dns_domain_check_order dns_conf_check_order = {
+struct dns_domain_check_orders dns_conf_check_orders = {
-	.order = {DOMAIN_CHECK_ICMP, DOMAIN_CHECK_TCP},
+	.orders =
-	.tcp_port = 80,
+		{
+			{.type = DOMAIN_CHECK_ICMP, .tcp_port = 0},
+			{.type = DOMAIN_CHECK_TCP, .tcp_port = 80},
+			{.type = DOMAIN_CHECK_TCP, .tcp_port = 443},
+		},
 };
-int dns_has_cap_ping = 0;
+static int dns_has_cap_ping = 0;
 
 /* logging */
 int dns_conf_log_level = TLOG_ERROR;
@@ -88,17 +107,21 @@ art_tree dns_conf_domain_rule;
 struct dns_conf_address_rule dns_conf_address_rule;
 
 /* dual-stack selection */
-int dns_conf_dualstack_ip_selection;
+int dns_conf_dualstack_ip_selection = 1;
-int dns_conf_dualstack_ip_selection_threshold = 30;
+int dns_conf_dualstack_ip_allow_force_AAAA;
+int dns_conf_dualstack_ip_selection_threshold = 15;
 
 /* TTL */
 int dns_conf_rr_ttl;
-int dns_conf_rr_ttl_min;
+int dns_conf_rr_ttl_reply_max;
+int dns_conf_rr_ttl_min = 600;
 int dns_conf_rr_ttl_max;
 int dns_conf_force_AAAA_SOA;
-
+int dns_conf_force_no_cname;
 int dns_conf_ipset_timeout_enable;
 
+char dns_conf_user[DNS_CONF_USRNAME_LEN];
+
 /* ECS */
 struct dns_edns_client_subnet dns_conf_ipv4_ecs;
 struct dns_edns_client_subnet dns_conf_ipv6_ecs;
@@ -226,7 +249,7 @@ static void _config_group_table_destroy(void)
 {
 	struct dns_server_groups *group = NULL;
 	struct hlist_node *tmp = NULL;
-	int i;
+	unsigned long i = 0;
 
 	hash_for_each_safe(dns_group_table.group, i, tmp, group, node)
 	{
@@ -238,7 +261,7 @@ static void _config_group_table_destroy(void)
 static int _config_server(int argc, char *argv[], dns_server_type_t type, int default_port)
 {
 	int index = dns_conf_server_num;
-	struct dns_servers *server;
+	struct dns_servers *server = NULL;
 	int port = -1;
 	char *ip = NULL;
 	int opt = 0;
@@ -432,7 +455,7 @@ static int _config_domain_rule_add(char *domain, enum domain_rule type, void *ru
 
 	/* Reverse string, for suffix match */
 	len = strlen(domain);
-	if (len >= sizeof(domain_key)) {
+	if (len >= (int)sizeof(domain_key)) {
 		tlog(TLOG_ERROR, "domain name %s too long", domain);
 		goto errout;
 	}
@@ -493,7 +516,7 @@ static int _config_domain_rule_flag_set(char *domain, unsigned int flag, unsigne
 	int len = 0;
 
 	len = strlen(domain);
-	if (len >= sizeof(domain_key)) {
+	if (len >= (int)sizeof(domain_key)) {
 		tlog(TLOG_ERROR, "domain %s too long", domain);
 		return -1;
 	}
@@ -551,7 +574,7 @@ static void _config_ipset_table_destroy(void)
 {
 	struct dns_ipset_name *ipset_name = NULL;
 	struct hlist_node *tmp = NULL;
-	int i;
+	unsigned long i = 0;
 
 	hash_for_each_safe(dns_ipset_table.ipset, i, tmp, ipset_name, node)
 	{
@@ -596,8 +619,8 @@ static int _conf_domain_rule_ipset(char *domain, const char *ipsetname)
 	struct dns_ipset_rule *ipset_rule = NULL;
 	const char *ipset = NULL;
 	char *copied_name = NULL;
-	enum domain_rule type;
+	enum domain_rule type = 0;
-	int ignore_flag;
+	int ignore_flag = 0;
 
 	copied_name = strdup(ipsetname);
 
@@ -607,10 +630,10 @@ static int _conf_domain_rule_ipset(char *domain, const char *ipsetname)
 
 	for (char *tok = strtok(copied_name, ","); tok; tok = strtok(NULL, ",")) {
 		if (tok[0] == '#') {
-			if (strncmp(tok, "#6:", 3u) == 0) {
+			if (strncmp(tok, "#6:", 3U) == 0) {
 				type = DOMAIN_RULE_IPSET_IPV6;
 				ignore_flag = DOMAIN_FLAG_IPSET_IPV6_IGN;
-			} else if (strncmp(tok, "#4:", 3u) == 0) {
+			} else if (strncmp(tok, "#4:", 3U) == 0) {
 				type = DOMAIN_RULE_IPSET_IPV4;
 				ignore_flag = DOMAIN_FLAG_IPSET_IPV4_IGN;
 			} else {
@@ -687,7 +710,7 @@ static int _conf_domain_rule_address(char *domain, const char *domain_address)
 	struct dns_address_IPV6 *address_ipv6 = NULL;
 	void *address = NULL;
 	char ip[MAX_IP_LEN];
-	int port;
+	int port = 0;
 	struct sockaddr_storage addr;
 	socklen_t addr_len = sizeof(addr);
 	enum domain_rule type = 0;
@@ -739,7 +762,7 @@ static int _conf_domain_rule_address(char *domain, const char *domain_address)
 
 		switch (addr.ss_family) {
 		case AF_INET: {
-			struct sockaddr_in *addr_in;
+			struct sockaddr_in *addr_in = NULL;
 			address_ipv4 = malloc(sizeof(*address_ipv4));
 			if (address_ipv4 == NULL) {
 				goto errout;
@@ -751,7 +774,7 @@ static int _conf_domain_rule_address(char *domain, const char *domain_address)
 			address = address_ipv4;
 		} break;
 		case AF_INET6: {
-			struct sockaddr_in6 *addr_in6;
+			struct sockaddr_in6 *addr_in6 = NULL;
 			addr_in6 = (struct sockaddr_in6 *)&addr;
 			if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
 				address_ipv4 = malloc(sizeof(*address_ipv4));
@@ -810,17 +833,17 @@ errout:
 	return 0;
 }
 
-static int _config_speed_check_mode_parser(struct dns_domain_check_order *check_order, const char *mode)
+static int _config_speed_check_mode_parser(struct dns_domain_check_orders *check_orders, const char *mode)
 {
 	char tmpbuff[DNS_MAX_OPT_LEN];
-	char *field;
+	char *field = NULL;
-	char *ptr;
+	char *ptr = NULL;
 	int order = 0;
 	int port = 80;
 	int i = 0;
 
 	safe_strncpy(tmpbuff, mode, DNS_MAX_OPT_LEN);
-	memset(check_order, 0, sizeof(*check_order));
+	memset(check_orders, 0, sizeof(*check_orders));
 
 	ptr = tmpbuff;
 	do {
@@ -841,7 +864,8 @@ static int _config_speed_check_mode_parser(struct dns_domain_check_order *check_
 				}
 				continue;
 			}
-			check_order->order[order] = DOMAIN_CHECK_ICMP;
+			check_orders->orders[order].type = DOMAIN_CHECK_ICMP;
+			check_orders->orders[order].tcp_port = 0;
 		} else if (strstr(field, "tcp") == field) {
 			char *port_str = strstr(field, ":");
 			if (port_str) {
@@ -851,12 +875,12 @@ static int _config_speed_check_mode_parser(struct dns_domain_check_order *check_
 				}
 			}
 
-			check_order->order[order] = DOMAIN_CHECK_TCP;
+			check_orders->orders[order].type = DOMAIN_CHECK_TCP;
-			check_order->tcp_port = port;
+			check_orders->orders[order].tcp_port = port;
 		} else if (strncmp(field, "none", sizeof("none")) == 0) {
-			check_order->order[order] = DOMAIN_CHECK_NONE;
+			for (i = order; i < DOMAIN_CHECK_NUM; i++) {
-			for (i = order + 1; i < DOMAIN_CHECK_NUM; i++) {
+				check_orders->orders[i].type = DOMAIN_CHECK_NONE;
-				check_order->order[i] = DOMAIN_CHECK_NONE;
+				check_orders->orders[i].tcp_port = 0;
 			}
 
 			return 0;
@@ -880,18 +904,19 @@ static int _config_speed_check_mode(void *data, int argc, char *argv[])
 	}
 
 	safe_strncpy(mode, argv[1], sizeof(mode));
-	return _config_speed_check_mode_parser(&dns_conf_check_order, mode);
+	return _config_speed_check_mode_parser(&dns_conf_check_orders, mode);
 }
 
 static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 {
 	int index = dns_conf_bind_ip_num;
-	struct dns_bind_ip *bind_ip;
+	struct dns_bind_ip *bind_ip = NULL;
 	char *ip = NULL;
 	int opt = 0;
 	char group_name[DNS_GROUP_NAME_LEN];
 	const char *group = NULL;
 	unsigned int server_flag = 0;
+	int i = 0;
 
 	/* clang-format off */
 	static struct option long_options[] = {
@@ -919,6 +944,20 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 		return 0;
 	}
 
+	for (i = 0; i < dns_conf_bind_ip_num; i++) {
+		bind_ip = &dns_conf_bind_ip[i];
+		if (bind_ip->type != type) {
+			continue;
+		}
+
+		if (strncmp(bind_ip->ip, ip, DNS_MAX_IPLEN) != 0) {
+			continue;
+		}
+
+		tlog(TLOG_WARN, "Bind server %s, type %d, already configured, skip.", ip, type);
+		return 0;
+	}
+
 	bind_ip = &dns_conf_bind_ip[index];
 	bind_ip->type = type;
 	bind_ip->flags = 0;
@@ -1105,8 +1144,8 @@ errout:
 
 static radix_node_t *_create_addr_node(char *addr)
 {
-	radix_node_t *node;
+	radix_node_t *node = NULL;
-	void *p;
+	void *p = NULL;
 	prefix_t prefix;
 	const char *errmsg = NULL;
 	radix_tree_t *tree = NULL;
@@ -1171,6 +1210,47 @@ static int _config_iplist_rule(char *subnet, enum address_rule rule)
 	return 0;
 }
 
+static int _config_qtype_soa(void *data, int argc, char *argv[])
+{
+	struct dns_qtype_soa_list *soa_list = NULL;
+	int i = 0;
+
+	if (argc <= 1) {
+		return -1;
+	}
+
+	for (i = 1; i < argc; i++) {
+		soa_list = malloc(sizeof(*soa_list));
+		if (soa_list == NULL) {
+			tlog(TLOG_ERROR, "cannot malloc memory");
+			return -1;
+		}
+
+		memset(soa_list, 0, sizeof(*soa_list));
+		soa_list->qtypeid = atol(argv[i]);
+		if (soa_list->qtypeid == DNS_T_AAAA) {
+			dns_conf_force_AAAA_SOA = 1;
+		}
+		uint32_t key = hash_32_generic(soa_list->qtypeid, 32);
+		hash_add(dns_qtype_soa_table.qtype, &soa_list->node, key);
+	}
+
+	return 0;
+}
+
+static void _config_qtype_soa_table_destroy(void)
+{
+	struct dns_qtype_soa_list *soa_list = NULL;
+	struct hlist_node *tmp = NULL;
+	unsigned long i = 0;
+
+	hash_for_each_safe(dns_qtype_soa_table.qtype, i, tmp, soa_list, node)
+	{
+		hlist_del_init(&soa_list->node);
+		free(soa_list);
+	}
+}
+
 static int _config_blacklist_ip(void *data, int argc, char *argv[])
 {
 	if (argc <= 1) {
@@ -1216,7 +1296,7 @@ static int _conf_edns_client_subnet(void *data, int argc, char *argv[])
 	struct sockaddr_storage addr;
 	socklen_t addr_len = sizeof(addr);
 
-	if (argc <= 1 || data == NULL) {
+	if (argc <= 1) {
 		return -1;
 	}
 
@@ -1259,25 +1339,26 @@ errout:
 
 static int _conf_domain_rule_speed_check(char *domain, const char *mode)
 {
-	struct dns_domain_check_order *check_order;
+	struct dns_domain_check_orders *check_orders = NULL;
 
-	check_order = malloc(sizeof(*check_order));
+	check_orders = malloc(sizeof(*check_orders) * DOMAIN_CHECK_NUM);
-	if (check_order == NULL) {
+	if (check_orders == NULL) {
+		goto errout;
+	}
+	memset(check_orders, 0, sizeof(*check_orders));
+
+	if (_config_speed_check_mode_parser(check_orders, mode) != 0) {
 		goto errout;
 	}
 
-	if (_config_speed_check_mode_parser(check_order, mode) != 0) {
+	if (_config_domain_rule_add(domain, DOMAIN_RULE_CHECKSPEED, check_orders) != 0) {
-		goto errout;
-	}
-
-	if (_config_domain_rule_add(domain, DOMAIN_RULE_CHECKSPEED, check_order) != 0) {
 		goto errout;
 	}
 
 	return 0;
 errout:
-	if (check_order) {
+	if (check_orders) {
-		free(check_order);
+		free(check_orders);
 	}
 	return 0;
 }
@@ -1388,6 +1469,342 @@ errout:
 	return -1;
 }
 
+static struct dns_ptr *_dns_conf_get_ptr(const char *ptr_domain)
+{
+	uint32_t key = 0;
+	struct dns_ptr *ptr = NULL;
+
+	key = hash_string(ptr_domain);
+	hash_for_each_possible(dns_ptr_table.ptr, ptr, node, key)
+	{
+		if (strncmp(ptr->ptr_domain, ptr_domain, DNS_MAX_PTR_LEN) != 0) {
+			continue;
+		}
+
+		return ptr;
+	}
+
+	ptr = malloc(sizeof(*ptr));
+	if (ptr == NULL) {
+		goto errout;
+	}
+
+	safe_strncpy(ptr->ptr_domain, ptr_domain, DNS_MAX_PTR_LEN);
+	hash_add(dns_ptr_table.ptr, &ptr->node, key);
+
+	return ptr;
+errout:
+	if (ptr) {
+		free(ptr);
+	}
+
+	return NULL;
+}
+
+static int _conf_ptr_add(const char *hostname, const char *ip)
+{
+	struct dns_ptr *ptr = NULL;
+	struct sockaddr_storage addr;
+	unsigned char *paddr = NULL;
+	socklen_t addr_len = sizeof(addr);
+	char ptr_domain[DNS_MAX_PTR_LEN];
+
+	if (getaddr_by_host(ip, (struct sockaddr *)&addr, &addr_len) != 0) {
+		goto errout;
+	}
+
+	switch (addr.ss_family) {
+	case AF_INET: {
+		struct sockaddr_in *addr_in = NULL;
+		addr_in = (struct sockaddr_in *)&addr;
+		paddr = (unsigned char *)&(addr_in->sin_addr.s_addr);
+		snprintf(ptr_domain, sizeof(ptr_domain), "%d.%d.%d.%d.in-addr.arpa", paddr[3], paddr[2], paddr[1], paddr[0]);
+	} break;
+	case AF_INET6: {
+		struct sockaddr_in6 *addr_in6 = NULL;
+		addr_in6 = (struct sockaddr_in6 *)&addr;
+		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
+			paddr = addr_in6->sin6_addr.s6_addr + 12;
+			snprintf(ptr_domain, sizeof(ptr_domain), "%d.%d.%d.%d.in-addr.arpa", paddr[3], paddr[2], paddr[1],
+					 paddr[0]);
+		} else {
+			paddr = addr_in6->sin6_addr.s6_addr;
+			snprintf(ptr_domain, sizeof(ptr_domain),
+					 "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x."
+					 "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x."
+					 "%x.ip6.arpa",
+					 paddr[15] & 0xF, (paddr[15] >> 4) & 0xF, paddr[14] & 0xF, (paddr[14] >> 4) & 0xF, paddr[13] & 0xF,
+					 (paddr[13] >> 4) & 0xF, paddr[12] & 0xF, (paddr[12] >> 4) & 0xF, paddr[11] & 0xF,
+					 (paddr[11] >> 4) & 0xF, paddr[10] & 0xF, (paddr[10] >> 4) & 0xF, paddr[9] & 0xF,
+					 (paddr[9] >> 4) & 0xF, paddr[8] & 0xF, (paddr[8] >> 4) & 0xF, paddr[7] & 0xF,
+					 (paddr[7] >> 4) & 0xF, paddr[6] & 0xF, (paddr[6] >> 4) & 0xF, paddr[5] & 0xF,
+					 (paddr[5] >> 4) & 0xF, paddr[4] & 0xF, (paddr[4] >> 4) & 0xF, paddr[3] & 0xF,
+					 (paddr[3] >> 4) & 0xF, paddr[2] & 0xF, (paddr[2] >> 4) & 0xF, paddr[1] & 0xF,
+					 (paddr[1] >> 4) & 0xF, paddr[0] & 0xF, (paddr[0] >> 4) & 0xF);
+		}
+	} break;
+	default:
+		goto errout;
+		break;
+	}
+
+	ptr = _dns_conf_get_ptr(ptr_domain);
+	if (ptr == NULL) {
+		goto errout;
+	}
+
+	safe_strncpy(ptr->hostname, hostname, DNS_MAX_CNAME_LEN);
+
+	return 0;
+
+errout:
+	return -1;
+}
+
+static void _config_ptr_table_destroy(void)
+{
+	struct dns_ptr *ptr = NULL;
+	struct hlist_node *tmp = NULL;
+	unsigned long i = 0;
+
+	hash_for_each_safe(dns_ptr_table.ptr, i, tmp, ptr, node)
+	{
+		hlist_del_init(&ptr->node);
+		free(ptr);
+	}
+}
+
+static struct dns_hosts *_dns_conf_get_hosts(const char *hostname, int dns_type)
+{
+	uint32_t key = 0;
+	struct dns_hosts *host = NULL;
+	char hostname_lower[DNS_MAX_CNAME_LEN];
+
+	key = hash_string(to_lower_case(hostname_lower, hostname, DNS_MAX_CNAME_LEN));
+	key = jhash(&dns_type, sizeof(dns_type), key);
+	hash_for_each_possible(dns_hosts_table.hosts, host, node, key)
+	{
+		if (host->dns_type != dns_type) {
+			continue;
+		}
+		if (strncmp(host->domain, hostname_lower, DNS_MAX_CNAME_LEN) != 0) {
+			continue;
+		}
+
+		return host;
+	}
+
+	host = malloc(sizeof(*host));
+	if (host == NULL) {
+		goto errout;
+	}
+
+	safe_strncpy(host->domain, hostname_lower, DNS_MAX_CNAME_LEN);
+	host->dns_type = dns_type;
+	host->is_soa = 1;
+	hash_add(dns_hosts_table.hosts, &host->node, key);
+
+	return host;
+errout:
+	if (host) {
+		free(host);
+	}
+
+	return NULL;
+}
+
+static int _conf_host_add(const char *hostname, const char *ip, dns_hosts_type host_type)
+{
+	struct dns_hosts *host = NULL;
+	struct dns_hosts *host_other __attribute__((unused));
+
+	struct sockaddr_storage addr;
+	socklen_t addr_len = sizeof(addr);
+	int dns_type = 0;
+	int dns_type_other = 0;
+
+	if (getaddr_by_host(ip, (struct sockaddr *)&addr, &addr_len) != 0) {
+		goto errout;
+	}
+
+	switch (addr.ss_family) {
+	case AF_INET:
+		dns_type = DNS_T_A;
+		dns_type_other = DNS_T_AAAA;
+		break;
+	case AF_INET6: {
+		struct sockaddr_in6 *addr_in6 = NULL;
+		addr_in6 = (struct sockaddr_in6 *)&addr;
+		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
+			dns_type = DNS_T_A;
+			dns_type_other = DNS_T_AAAA;
+		} else {
+			dns_type = DNS_T_AAAA;
+			dns_type_other = DNS_T_A;
+		}
+	} break;
+	default:
+		goto errout;
+		break;
+	}
+
+	host = _dns_conf_get_hosts(hostname, dns_type);
+	if (host == NULL) {
+		goto errout;
+	}
+
+	/* add this to return SOA when addr is not exist */
+	host_other = _dns_conf_get_hosts(hostname, dns_type_other);
+
+	host->host_type = host_type;
+
+	switch (addr.ss_family) {
+	case AF_INET: {
+		struct sockaddr_in *addr_in = NULL;
+		addr_in = (struct sockaddr_in *)&addr;
+		memcpy(host->ipv4_addr, &addr_in->sin_addr.s_addr, 4);
+		host->is_soa = 0;
+	} break;
+	case AF_INET6: {
+		struct sockaddr_in6 *addr_in6 = NULL;
+		addr_in6 = (struct sockaddr_in6 *)&addr;
+		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
+			memcpy(host->ipv4_addr, addr_in6->sin6_addr.s6_addr + 12, 4);
+		} else {
+			memcpy(host->ipv6_addr, addr_in6->sin6_addr.s6_addr, 16);
+		}
+		host->is_soa = 0;
+	} break;
+	default:
+		goto errout;
+	}
+
+	dns_hosts_record_num++;
+	return 0;
+
+errout:
+	return -1;
+}
+
+static int _conf_dhcp_lease_dnsmasq_add(const char *file)
+{
+	FILE *fp = NULL;
+	char line[MAX_LINE_LEN];
+	char ip[DNS_MAX_IPLEN];
+	char hostname[DNS_MAX_CNAME_LEN];
+	int ret = 0;
+	int line_no = 0;
+	int filed_num = 0;
+
+	fp = fopen(file, "r");
+	if (fp == NULL) {
+		tlog(TLOG_WARN, "open file %s error, %s", file, strerror(errno));
+		return 0;
+	}
+
+	line_no = 0;
+	while (fgets(line, MAX_LINE_LEN, fp)) {
+		line_no++;
+		filed_num = sscanf(line, "%*s %*s %64s %256s %*s", ip, hostname);
+		if (filed_num <= 0) {
+			continue;
+		}
+
+		if (strncmp(hostname, "*", DNS_MAX_CNAME_LEN - 1) == 0) {
+			continue;
+		}
+
+		ret = _conf_host_add(hostname, ip, DNS_HOST_TYPE_DNSMASQ);
+		if (ret != 0) {
+			tlog(TLOG_WARN, "add host %s/%s at %d failed", hostname, ip, line_no);
+		}
+
+		ret = _conf_ptr_add(hostname, ip);
+		if (ret != 0) {
+			tlog(TLOG_WARN, "add ptr %s/%s at %d failed.", hostname, ip, line_no);
+		}
+	}
+
+	fclose(fp);
+
+	return 0;
+}
+
+static int _conf_dhcp_lease_dnsmasq_file(void *data, int argc, char *argv[])
+{
+	struct stat statbuf;
+
+	if (argc < 1) {
+		return -1;
+	}
+
+	safe_strncpy(dns_conf_dnsmasq_lease_file, argv[1], DNS_MAX_PATH);
+	if (_conf_dhcp_lease_dnsmasq_add(argv[1]) != 0) {
+		return -1;
+	}
+
+	if (stat(dns_conf_dnsmasq_lease_file, &statbuf) != 0) {
+		return 0;
+	}
+
+	dns_conf_dnsmasq_lease_file_time = statbuf.st_mtime;
+	return 0;
+}
+
+static int _conf_hosts_file(void *data, int argc, char *argv[])
+{
+	return 0;
+}
+
+static void _config_host_table_destroy(void)
+{
+	struct dns_hosts *host = NULL;
+	struct hlist_node *tmp = NULL;
+	unsigned long i = 0;
+
+	hash_for_each_safe(dns_hosts_table.hosts, i, tmp, host, node)
+	{
+		hlist_del_init(&host->node);
+		free(host);
+	}
+
+	dns_hosts_record_num = 0;
+}
+
+int dns_server_check_update_hosts(void)
+{
+	struct stat statbuf;
+	time_t now = 0;
+
+	if (dns_conf_dnsmasq_lease_file[0] == '\0') {
+		return -1;
+	}
+
+	if (stat(dns_conf_dnsmasq_lease_file, &statbuf) != 0) {
+		return -1;
+	}
+
+	if (dns_conf_dnsmasq_lease_file_time == statbuf.st_mtime) {
+		return -1;
+	}
+
+	time(&now);
+
+	if (now - statbuf.st_mtime < 30) {
+		return -1;
+	}
+
+	_config_ptr_table_destroy();
+	_config_host_table_destroy();
+
+	if (_conf_dhcp_lease_dnsmasq_add(dns_conf_dnsmasq_lease_file) != 0) {
+		return -1;
+	}
+
+	dns_conf_dnsmasq_lease_file_time = statbuf.st_mtime;
+	return 0;
+}
+
 static int _config_log_level(void *data, int argc, char *argv[])
 {
 	/* read log level and set */
@@ -1412,6 +1829,35 @@ static int _config_log_level(void *data, int argc, char *argv[])
 	return 0;
 }
 
+static void _config_setup_smartdns_domain(void)
+{
+	char hostname[DNS_MAX_CNAME_LEN];
+	/* get local host name */
+	if (getdomainname(hostname, DNS_MAX_CNAME_LEN) != 0) {
+		gethostname(hostname, DNS_MAX_CNAME_LEN);
+	}
+
+	/* get host name again */
+	if (strncmp(hostname, "(none)", DNS_MAX_CNAME_LEN - 1) == 0) {
+		gethostname(hostname, DNS_MAX_CNAME_LEN);
+	}
+
+	/* if hostname is (none), return smartdns */
+	if (strncmp(hostname, "(none)", DNS_MAX_CNAME_LEN - 1) == 0) {
+		safe_strncpy(hostname, "smartdns", DNS_MAX_CNAME_LEN);
+	}
+
+	if (hostname[0] != '\0') {
+		_config_domain_rule_flag_set(hostname, DOMAIN_FLAG_SMARTDNS_DOMAIN, 0);
+	}
+
+	if (dns_conf_server_name[0] != '\0') {
+		_config_domain_rule_flag_set(dns_conf_server_name, DOMAIN_FLAG_SMARTDNS_DOMAIN, 0);
+	}
+
+	_config_domain_rule_flag_set("smartdns", DOMAIN_FLAG_SMARTDNS_DOMAIN, 0);
+}
+
 static struct config_item _config_item[] = {
 	CONF_STRING("server-name", (char *)dns_conf_server_name, DNS_MAX_SERVER_NAME_LEN),
 	CONF_CUSTOM("bind", _config_bind_ip_udp, NULL),
@@ -1433,7 +1879,9 @@ static struct config_item _config_item[] = {
 	CONF_YESNO("serve-expired", &dns_conf_serve_expired),
 	CONF_INT("serve-expired-ttl", &dns_conf_serve_expired_ttl, 0, CONF_INT_MAX),
 	CONF_INT("serve-expired-reply-ttl", &dns_conf_serve_expired_reply_ttl, 0, CONF_INT_MAX),
+	CONF_INT("serve-expired-prefetch-time", &dns_conf_serve_expired_prefetch_time, 0, CONF_INT_MAX),
 	CONF_YESNO("dualstack-ip-selection", &dns_conf_dualstack_ip_selection),
+	CONF_YESNO("dualstack-ip-allow-force-AAAA", &dns_conf_dualstack_ip_allow_force_AAAA),
 	CONF_INT("dualstack-ip-selection-threshold", &dns_conf_dualstack_ip_selection_threshold, 0, 1000),
 	CONF_CUSTOM("log-level", _config_log_level, NULL),
 	CONF_STRING("log-file", (char *)dns_conf_log_file, DNS_MAX_PATH),
@@ -1447,29 +1895,38 @@ static struct config_item _config_item[] = {
 	CONF_INT("rr-ttl", &dns_conf_rr_ttl, 0, CONF_INT_MAX),
 	CONF_INT("rr-ttl-min", &dns_conf_rr_ttl_min, 0, CONF_INT_MAX),
 	CONF_INT("rr-ttl-max", &dns_conf_rr_ttl_max, 0, CONF_INT_MAX),
+	CONF_INT("rr-ttl-reply-max", &dns_conf_rr_ttl_reply_max, 0, CONF_INT_MAX),
+	CONF_INT("max-reply-ip-num", &dns_conf_max_reply_ip_num, 1, CONF_INT_MAX),
 	CONF_YESNO("force-AAAA-SOA", &dns_conf_force_AAAA_SOA),
+	CONF_YESNO("force-no-CNAME", &dns_conf_force_no_cname),
+	CONF_CUSTOM("force-qtype-SOA", _config_qtype_soa, NULL),
 	CONF_CUSTOM("blacklist-ip", _config_blacklist_ip, NULL),
 	CONF_CUSTOM("whitelist-ip", _conf_whitelist_ip, NULL),
 	CONF_CUSTOM("bogus-nxdomain", _conf_bogus_nxdomain, NULL),
 	CONF_CUSTOM("ignore-ip", _conf_ip_ignore, NULL),
 	CONF_CUSTOM("edns-client-subnet", _conf_edns_client_subnet, NULL),
 	CONF_CUSTOM("domain-rules", _conf_domain_rules, NULL),
+	CONF_CUSTOM("dnsmasq-lease-file", _conf_dhcp_lease_dnsmasq_file, NULL),
+	CONF_CUSTOM("hosts-file", _conf_hosts_file, NULL),
 	CONF_STRING("ca-file", (char *)&dns_conf_ca_file, DNS_MAX_PATH),
 	CONF_STRING("ca-path", (char *)&dns_conf_ca_path, DNS_MAX_PATH),
+	CONF_STRING("user", (char *)&dns_conf_user, sizeof(dns_conf_user)),
 	CONF_CUSTOM("conf-file", config_addtional_file, NULL),
 	CONF_END(),
 };
 
 static int _conf_printf(const char *file, int lineno, int ret)
 {
-	if (ret == CONF_RET_ERR) {
+	switch (ret) {
-		tlog(TLOG_ERROR, "process config file '%s' failed at line %d.", file, lineno);
+	case CONF_RET_ERR:
-		syslog(LOG_NOTICE, "process config file '%s' failed at line %d.", file, lineno);
+	case CONF_RET_WARN:
-		return -1;
+	case CONF_RET_BADCONF:
-	} else if (ret == CONF_RET_WARN) {
 		tlog(TLOG_WARN, "process config file '%s' failed at line %d.", file, lineno);
 		syslog(LOG_NOTICE, "process config file '%s' failed at line %d.", file, lineno);
 		return -1;
+		break;
+	default:
+		break;
 	}
 
 	return 0;
@@ -1477,10 +1934,15 @@ static int _conf_printf(const char *file, int lineno, int ret)
 
 int config_addtional_file(void *data, int argc, char *argv[])
 {
-	char *conf_file = argv[1];
+	char *conf_file = NULL;
 	char file_path[DNS_MAX_PATH];
 	char file_path_dir[DNS_MAX_PATH];
 
+	if (argc < 1) {
+		return -1;
+	}
+
+	conf_file = argv[1];
 	if (conf_file[0] != '/') {
 		safe_strncpy(file_path_dir, conf_get_conf_file(), DNS_MAX_PATH);
 		dirname(file_path_dir);
@@ -1518,7 +1980,12 @@ static int _dns_server_load_conf_init(void)
 	art_tree_init(&dns_conf_domain_rule);
 
 	hash_init(dns_ipset_table.ipset);
+	hash_init(dns_qtype_soa_table.qtype);
 	hash_init(dns_group_table.group);
+	hash_init(dns_hosts_table.hosts);
+	hash_init(dns_ptr_table.ptr);
+
+	_config_setup_smartdns_domain();
 
 	return 0;
 }
@@ -1530,11 +1997,15 @@ void dns_server_load_exit(void)
 	Destroy_Radix(dns_conf_address_rule.ipv6, _config_address_destroy, NULL);
 	_config_ipset_table_destroy();
 	_config_group_table_destroy();
+	_config_ptr_table_destroy();
+	_config_host_table_destroy();
+	_config_qtype_soa_table_destroy();
 }
 
 static int _dns_conf_speed_check_mode_verify(void)
 {
-	int i, j;
+	int i = 0;
+	int j = 0;
 	int print_log = 0;
 
 	if (dns_has_cap_ping == 1) {
@@ -1542,11 +2013,13 @@ static int _dns_conf_speed_check_mode_verify(void)
 	}
 
 	for (i = 0; i < DOMAIN_CHECK_NUM; i++) {
-		if (dns_conf_check_order.order[i] == DOMAIN_CHECK_ICMP) {
+		if (dns_conf_check_orders.orders[i].type == DOMAIN_CHECK_ICMP) {
 			for (j = i + 1; j < DOMAIN_CHECK_NUM; j++) {
-				dns_conf_check_order.order[j - 1] = dns_conf_check_order.order[j];
+				dns_conf_check_orders.orders[j - 1].type = dns_conf_check_orders.orders[j].type;
+				dns_conf_check_orders.orders[j - 1].tcp_port = dns_conf_check_orders.orders[j].tcp_port;
 			}
-			dns_conf_check_order.order[j - 1] = DOMAIN_CHECK_NONE;
+			dns_conf_check_orders.orders[j - 1].type = DOMAIN_CHECK_NONE;
+			dns_conf_check_orders.orders[j - 1].tcp_port = 0;
 			print_log = 1;
 		}
 	}
@@ -1558,13 +2031,33 @@ static int _dns_conf_speed_check_mode_verify(void)
 	return 0;
 }
 
+static int _dns_ping_cap_check(void)
+{
+	int has_ping = 0;
+	int has_raw_cap = 0;
+
+	has_raw_cap = has_network_raw_cap();
+	has_ping = has_unprivileged_ping();
+	if (has_ping == 0) {
+		if (errno == EACCES && has_raw_cap == 0) {
+			tlog(TLOG_WARN, "unpriviledged ping is disabled, please enable by setting net.ipv4.ping_group_range");
+		}
+	}
+
+	if (has_ping == 1 || has_raw_cap == 1) {
+		dns_has_cap_ping = 1;
+	}
+
+	return 0;
+}
+
 static int _dns_conf_load_pre(void)
 {
 	if (_dns_server_load_conf_init() != 0) {
 		goto errout;
 	}
 
-	dns_has_cap_ping = has_network_raw_cap();
+	_dns_ping_cap_check();
 
 	return 0;
 

src/dns_conf.h

@@ -35,10 +35,12 @@ extern "C" {
 #define DNS_MAX_BIND_IP 16
 #define DNS_MAX_SERVERS 64
 #define DNS_MAX_SERVER_NAME_LEN 128
+#define DNS_MAX_PTR_LEN 128
 #define DNS_MAX_IPSET_NAMELEN 32
 #define DNS_GROUP_NAME_LEN 32
 #define DNS_NAX_GROUP_NUMBER 16
 #define DNS_MAX_IPLEN 64
+#define DNS_CONF_USRNAME_LEN 32
 #define DNS_MAX_SPKI_LEN 64
 #define DNS_MAX_URL_LEN 256
 #define DNS_MAX_PATH 1024
@@ -72,7 +74,7 @@ typedef enum {
 #define DOMAIN_CHECK_NONE 0
 #define DOMAIN_CHECK_ICMP 1
 #define DOMAIN_CHECK_TCP 2
-#define DOMAIN_CHECK_NUM 2
+#define DOMAIN_CHECK_NUM 3
 
 #define DOMAIN_FLAG_ADDR_SOA (1 << 0)
 #define DOMAIN_FLAG_ADDR_IPV4_SOA (1 << 1)
@@ -85,6 +87,7 @@ typedef enum {
 #define DOMAIN_FLAG_IPSET_IPV6_IGN (1 << 8)
 #define DOMAIN_FLAG_NAMESERVER_IGNORE (1 << 9)
 #define DOMAIN_FLAG_DUALSTACK_SELECT (1 << 10)
+#define DOMAIN_FLAG_SMARTDNS_DOMAIN (1 << 11)
 
 #define SERVER_FLAG_EXCLUDE_DEFAULT (1 << 0)
 
@@ -136,15 +139,53 @@ struct dns_server_groups {
 };
 
 struct dns_domain_check_order {
-	char order[DOMAIN_CHECK_NUM];
+	char type;
 	unsigned short tcp_port;
 };
 
+struct dns_domain_check_orders {
+	struct dns_domain_check_order orders[DOMAIN_CHECK_NUM];
+};
+
 struct dns_group_table {
 	DECLARE_HASHTABLE(group, 8);
 };
 extern struct dns_group_table dns_group_table;
 
+struct dns_ptr {
+	struct hlist_node node;
+	char ptr_domain[DNS_MAX_PTR_LEN];
+	char hostname[DNS_MAX_CNAME_LEN];
+};
+
+struct dns_ptr_table {
+	DECLARE_HASHTABLE(ptr, 16);
+};
+extern struct dns_ptr_table dns_ptr_table;
+
+typedef enum dns_hosts_type {
+	DNS_HOST_TYPE_HOST = 0,
+	DNS_HOST_TYPE_DNSMASQ = 1,
+} dns_hosts_type;
+
+struct dns_hosts {
+	struct hlist_node node;
+	char domain[DNS_MAX_CNAME_LEN];
+	dns_hosts_type host_type;
+	int dns_type;
+	int is_soa;	
+	union {
+		unsigned char ipv4_addr[DNS_RR_A_LEN];
+		unsigned char ipv6_addr[DNS_RR_AAAA_LEN];
+	};
+};
+
+struct dns_hosts_table {
+	DECLARE_HASHTABLE(hosts, 16);
+};
+extern struct dns_hosts_table dns_hosts_table;
+extern int dns_hosts_record_num;
+
 struct dns_servers {
 	char server[DNS_MAX_IPLEN];
 	unsigned short port;
@@ -203,6 +244,16 @@ struct dns_bind_ip {
 	const char *group;
 };
 
+struct dns_qtype_soa_list {
+	struct hlist_node node;
+	uint32_t qtypeid;
+};
+
+struct dns_qtype_soa_table {
+	DECLARE_HASHTABLE(qtype, 8);
+};
+extern struct dns_qtype_soa_table dns_qtype_soa_table;
+
 extern struct dns_bind_ip dns_conf_bind_ip[DNS_MAX_BIND_IP];
 extern int dns_conf_bind_ip_num;
 
@@ -211,6 +262,7 @@ extern int dns_conf_cachesize;
 extern int dns_conf_prefetch;
 extern int dns_conf_serve_expired;
 extern int dns_conf_serve_expired_ttl;
+extern int dns_conf_serve_expired_prefetch_time;
 extern int dns_conf_serve_expired_reply_ttl;
 extern struct dns_servers dns_conf_servers[DNS_MAX_SERVERS];
 extern int dns_conf_server_num;
@@ -226,7 +278,7 @@ extern char dns_conf_ca_path[DNS_MAX_PATH];
 extern char dns_conf_cache_file[DNS_MAX_PATH];
 extern int dns_conf_cache_persist;
 
-extern struct dns_domain_check_order dns_conf_check_order;
+extern struct dns_domain_check_orders dns_conf_check_orders;
 
 extern struct dns_server_groups dns_conf_server_groups[DNS_NAX_GROUP_NUMBER];
 extern int dns_conf_server_group_num;
@@ -242,14 +294,22 @@ extern art_tree dns_conf_domain_rule;
 extern struct dns_conf_address_rule dns_conf_address_rule;
 
 extern int dns_conf_dualstack_ip_selection;
+extern int dns_conf_dualstack_ip_allow_force_AAAA;
 extern int dns_conf_dualstack_ip_selection_threshold;
 
+extern int dns_conf_max_reply_ip_num;
+
 extern int dns_conf_rr_ttl;
+extern int dns_conf_rr_ttl_reply_max;
 extern int dns_conf_rr_ttl_min;
 extern int dns_conf_rr_ttl_max;
 extern int dns_conf_force_AAAA_SOA;
 extern int dns_conf_ipset_timeout_enable;
 
+extern int dns_conf_force_no_cname;
+
+extern char dns_conf_user[DNS_CONF_USRNAME_LEN];
+
 extern struct dns_edns_client_subnet dns_conf_ipv4_ecs;
 extern struct dns_edns_client_subnet dns_conf_ipv6_ecs;
 
@@ -259,6 +319,8 @@ void dns_server_load_exit(void);
 
 int dns_server_load_conf(const char *file);
 
+int dns_server_check_update_hosts(void);
+
 extern int config_addtional_file(void *data, int argc, char *argv[]);
 #ifdef __cpluscplus
 }

src/dns_server.h

@@ -37,11 +37,11 @@ void dns_server_stop(void);
 void dns_server_exit(void);
 
 /* query result notify function */
-typedef int (*dns_result_callback)(char *domain, dns_rtcode_t rtcode, dns_type_t addr_type, char *ip,
+typedef int (*dns_result_callback)(const char *domain, dns_rtcode_t rtcode, dns_type_t addr_type, char *ip,
 								   unsigned int ping_time, void *user_ptr);
 
 /* query domain */
-int dns_server_query(char *domain, int qtype, uint32_t server_flags, dns_result_callback callback, void *user_ptr);
+int dns_server_query(const char *domain, int qtype, uint32_t server_flags, dns_result_callback callback, void *user_ptr);
 
 #ifdef __cpluscplus
 }

src/fast_ping.c

@@ -97,6 +97,7 @@ struct ping_host_struct {
 	FAST_PING_TYPE type;
 
 	void *userptr;
+	int error;
 	fast_ping_result ping_callback;
 	char host[PING_MAX_HOSTLEN];
 
@@ -123,12 +124,13 @@ struct ping_host_struct {
 };
 
 struct fast_ping_struct {
-	int run;
+	atomic_t run;
 	pthread_t tid;
 	pthread_mutex_t lock;
 	unsigned short ident;
 
 	int epoll_fd;
+	int no_unprivileged_ping;
 	int fd_icmp;
 	struct ping_host_struct icmp_host;
 	int fd_icmp6;
@@ -149,7 +151,7 @@ static int bool_print_log = 1;
 static uint16_t _fast_ping_checksum(uint16_t *header, size_t len)
 {
 	uint32_t sum = 0;
-	int i;
+	unsigned int i = 0;
 
 	for (i = 0; i < len / sizeof(uint16_t); i++) {
 		sum += ntohs(header[i]);
@@ -260,13 +262,13 @@ static uint32_t _fast_ping_hash_key(unsigned int sid, struct sockaddr *addr)
 
 	switch (addr->sa_family) {
 	case AF_INET: {
-		struct sockaddr_in *addr_in;
+		struct sockaddr_in *addr_in = NULL;
 		addr_in = (struct sockaddr_in *)addr;
 		sin_addr = &addr_in->sin_addr.s_addr;
 		sin_addr_len = IPV4_ADDR_LEN;
 	} break;
 	case AF_INET6: {
-		struct sockaddr_in6 *addr_in6;
+		struct sockaddr_in6 *addr_in6 = NULL;
 		addr_in6 = (struct sockaddr_in6 *)addr;
 		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
 			sin_addr = addr_in6->sin6_addr.s6_addr + 12;
@@ -356,7 +358,7 @@ static void _fast_ping_close_host_sock(struct ping_host_struct *ping_host)
 	if (ping_host->fd < 0) {
 		return;
 	}
-	struct epoll_event *event;
+	struct epoll_event *event = NULL;
 	event = (struct epoll_event *)1;
 	epoll_ctl(ping.epoll_fd, EPOLL_CTL_DEL, ping_host->fd, event);
 	close(ping_host->fd);
@@ -365,7 +367,12 @@ static void _fast_ping_close_host_sock(struct ping_host_struct *ping_host)
 
 static void _fast_ping_host_put(struct ping_host_struct *ping_host)
 {
-	if (!atomic_dec_and_test(&ping_host->ref)) {
+	int ref_cnt = atomic_dec_and_test(&ping_host->ref);
+	if (!ref_cnt) {
+		if (ref_cnt < 0) {
+			tlog(TLOG_ERROR, "invalid refcount of ping_host %s", ping_host->host);
+			abort();
+		}
 		return;
 	}
 
@@ -381,11 +388,10 @@ static void _fast_ping_host_put(struct ping_host_struct *ping_host)
 		tv.tv_usec = 0;
 
 		ping_host->ping_callback(ping_host, ping_host->host, PING_RESULT_END, &ping_host->addr, ping_host->addr_len,
-								 ping_host->seq, ping_host->ttl, &tv, ping_host->userptr);
+								 ping_host->seq, ping_host->ttl, &tv, ping_host->error, ping_host->userptr);
 	}
 
-	tlog(TLOG_DEBUG, "ping end, id %d", ping_host->sid);
+	tlog(TLOG_DEBUG, "ping %s end, id %d", ping_host->host, ping_host->sid);
-	// memset(ping_host, 0, sizeof(*ping_host));
 	ping_host->type = FAST_PING_END;
 	free(ping_host);
 }
@@ -409,7 +415,7 @@ static void _fast_ping_host_remove(struct ping_host_struct *ping_host)
 		tv.tv_usec = 0;
 
 		ping_host->ping_callback(ping_host, ping_host->host, PING_RESULT_END, &ping_host->addr, ping_host->addr_len,
-								 ping_host->seq, ping_host->ttl, &tv, ping_host->userptr);
+								 ping_host->seq, ping_host->ttl, &tv, ping_host->error, ping_host->userptr);
 	}
 
 	_fast_ping_host_put(ping_host);
@@ -436,11 +442,11 @@ static int _fast_ping_sendping_v6(struct ping_host_struct *ping_host)
 	packet->msg.seq = ping_host->seq;
 	icmp6->icmp6_cksum = _fast_ping_checksum((void *)packet, sizeof(struct fast_ping_packet));
 
-	len = sendto(ping.fd_icmp6, &ping_host->packet, sizeof(struct fast_ping_packet), 0,
+	len = sendto(ping.fd_icmp6, &ping_host->packet, sizeof(struct fast_ping_packet), 0, &ping_host->addr,
-				 (struct sockaddr *)&ping_host->addr, ping_host->addr_len);
+				 ping_host->addr_len);
 	if (len < 0 || len != sizeof(struct fast_ping_packet)) {
 		int err = errno;
-		if (errno == ENETUNREACH || errno == EINVAL) {
+		if (errno == ENETUNREACH || errno == EINVAL || errno == EADDRNOTAVAIL) {
 			goto errout;
 		}
 
@@ -468,7 +474,7 @@ static int _fast_ping_sendping_v4(struct ping_host_struct *ping_host)
 {
 	struct fast_ping_packet *packet = &ping_host->packet;
 	struct icmp *icmp = &packet->icmp;
-	int len;
+	int len = 0;
 
 	ping_host->seq++;
 	memset(icmp, 0, sizeof(*icmp));
@@ -485,11 +491,10 @@ static int _fast_ping_sendping_v4(struct ping_host_struct *ping_host)
 	packet->msg.cookie = ping_host->cookie;
 	icmp->icmp_cksum = _fast_ping_checksum((void *)packet, sizeof(struct fast_ping_packet));
 
-	len = sendto(ping.fd_icmp, packet, sizeof(struct fast_ping_packet), 0, (struct sockaddr *)&ping_host->addr,
+	len = sendto(ping.fd_icmp, packet, sizeof(struct fast_ping_packet), 0, &ping_host->addr, ping_host->addr_len);
-				 ping_host->addr_len);
 	if (len < 0 || len != sizeof(struct fast_ping_packet)) {
 		int err = errno;
-		if (errno == ENETUNREACH || errno == EINVAL) {
+		if (errno == ENETUNREACH || errno == EINVAL || errno == EADDRNOTAVAIL) {
 			goto errout;
 		}
 		char ping_host_name[PING_MAX_HOSTLEN];
@@ -508,7 +513,7 @@ errout:
 static int _fast_ping_sendping_udp(struct ping_host_struct *ping_host)
 {
 	struct ping_dns_head dns_head;
-	int len;
+	int len = 0;
 	int flag = 0;
 	int fd = 0;
 
@@ -533,10 +538,10 @@ static int _fast_ping_sendping_udp(struct ping_host_struct *ping_host)
 	dns_head.id = htons(ping_host->sid);
 	dns_head.flag = flag;
 	gettimeofday(&ping_host->last, NULL);
-	len = sendto(fd, &dns_head, sizeof(dns_head), 0, (struct sockaddr *)&ping_host->addr, ping_host->addr_len);
+	len = sendto(fd, &dns_head, sizeof(dns_head), 0, &ping_host->addr, ping_host->addr_len);
 	if (len < 0 || len != sizeof(dns_head)) {
 		int err = errno;
-		if (errno == ENETUNREACH || errno == EINVAL) {
+		if (errno == ENETUNREACH || errno == EINVAL || errno == EADDRNOTAVAIL) {
 			goto errout;
 		}
 		char ping_host_name[PING_MAX_HOSTLEN];
@@ -555,7 +560,7 @@ errout:
 static int _fast_ping_sendping_tcp(struct ping_host_struct *ping_host)
 {
 	struct epoll_event event;
-	int flags;
+	int flags = 0;
 	int fd = -1;
 	int yes = 1;
 	const int priority = SOCKET_PRIORITY;
@@ -580,10 +585,10 @@ static int _fast_ping_sendping_tcp(struct ping_host_struct *ping_host)
 	set_sock_lingertime(fd, 0);
 
 	ping_host->seq++;
-	if (connect(fd, (struct sockaddr *)&ping_host->addr, ping_host->addr_len) != 0) {
+	if (connect(fd, &ping_host->addr, ping_host->addr_len) != 0) {
 		if (errno != EINPROGRESS) {
 			char ping_host_name[PING_MAX_HOSTLEN];
-			if (errno == ENETUNREACH || errno == EINVAL) {
+			if (errno == ENETUNREACH || errno == EINVAL || errno == EADDRNOTAVAIL) {
 				goto errout;
 			}
 
@@ -639,6 +644,7 @@ static int _fast_ping_sendping(struct ping_host_struct *ping_host)
 	ping_host->send = 1;
 
 	if (ret != 0) {
+		ping_host->error = errno;
 		return ret;
 	}
 
@@ -658,21 +664,34 @@ static int _fast_ping_create_icmp_sock(FAST_PING_TYPE type)
 
 	switch (type) {
 	case FAST_PING_ICMP:
+		if (ping.no_unprivileged_ping == 0) {
+			fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
+		} else {
 			fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+			if (fd > 0) {
+				_fast_ping_install_filter_v4(fd);
+			}
+		}
 		if (fd < 0) {
 			tlog(TLOG_ERROR, "create icmp socket failed, %s\n", strerror(errno));
 			goto errout;
 		}
-		_fast_ping_install_filter_v4(fd);
 		icmp_host = &ping.icmp_host;
 		break;
 	case FAST_PING_ICMP6:
+		if (ping.no_unprivileged_ping == 0) {
+			fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6);
+		} else {
 			fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
+			if (fd > 0) {
+				_fast_ping_install_filter_v6(fd);
+			}
+		}
+
 		if (fd < 0) {
 			tlog(TLOG_ERROR, "create icmp socket failed, %s\n", strerror(errno));
 			goto errout;
 		}
-		_fast_ping_install_filter_v6(fd);
 		setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof(on));
 		setsockopt(fd, IPPROTO_IPV6, IPV6_2292HOPLIMIT, &on, sizeof(on));
 		setsockopt(fd, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, sizeof(on));
@@ -691,6 +710,9 @@ static int _fast_ping_create_icmp_sock(FAST_PING_TYPE type)
 	setsockopt(fd, SOL_IP, IP_TTL, &val, sizeof(val));
 	setsockopt(fd, IPPROTO_IP, IP_TOS, &ip_tos, sizeof(ip_tos));
 
+	icmp_host->fd = fd;
+	icmp_host->type = type;
+
 	memset(&event, 0, sizeof(event));
 	event.events = EPOLLIN;
 	event.data.ptr = icmp_host;
@@ -698,12 +720,14 @@ static int _fast_ping_create_icmp_sock(FAST_PING_TYPE type)
 		goto errout;
 	}
 
-	icmp_host->fd = fd;
-	icmp_host->type = type;
 	return fd;
 
 errout:
 	close(fd);
+	if (icmp_host) {
+		icmp_host->fd = -1;
+		icmp_host->type = 0;
+	}
 	return -1;
 }
 
@@ -843,13 +867,15 @@ errout:
 
 static void _fast_ping_print_result(struct ping_host_struct *ping_host, const char *host, FAST_PING_RESULT result,
 									struct sockaddr *addr, socklen_t addr_len, int seqno, int ttl, struct timeval *tv,
-									void *userptr)
+									int error, void *userptr)
 {
 	if (result == PING_RESULT_RESPONSE) {
 		double rtt = tv->tv_sec * 1000.0 + tv->tv_usec / 1000.0;
 		tlog(TLOG_INFO, "from %15s: seq=%d ttl=%d time=%.3f\n", host, seqno, ttl, rtt);
 	} else if (result == PING_RESULT_TIMEOUT) {
 		tlog(TLOG_INFO, "from %15s: seq=%d timeout\n", host, seqno);
+	} else if (result == PING_RESULT_ERROR) {
+		tlog(TLOG_DEBUG, "from %15s: error is %s\n", host, strerror(error));
 	} else if (result == PING_RESULT_END) {
 		fast_ping_stop(ping_host);
 	}
@@ -861,7 +887,7 @@ static int _fast_ping_get_addr_by_icmp(const char *ip_str, int port, struct addr
 	struct addrinfo *gai = NULL;
 	int socktype = 0;
 	int domain = -1;
-	FAST_PING_TYPE ping_type;
+	FAST_PING_TYPE ping_type = 0;
 	int sockproto = 0;
 	char *service = NULL;
 
@@ -910,7 +936,7 @@ static int _fast_ping_get_addr_by_tcp(const char *ip_str, int port, struct addri
 {
 	struct addrinfo *gai = NULL;
 	int socktype = 0;
-	FAST_PING_TYPE ping_type;
+	FAST_PING_TYPE ping_type = 0;
 	int sockproto = 0;
 	char *service = NULL;
 	char port_str[MAX_IP_LEN];
@@ -946,7 +972,7 @@ static int _fast_ping_get_addr_by_dns(const char *ip_str, int port, struct addri
 {
 	struct addrinfo *gai = NULL;
 	int socktype = 0;
-	FAST_PING_TYPE ping_type;
+	FAST_PING_TYPE ping_type = 0;
 	int sockproto = 0;
 	char port_str[MAX_IP_LEN];
 	int domain = -1;
@@ -1023,11 +1049,11 @@ struct ping_host_struct *fast_ping_start(PING_TYPE type, const char *host, int c
 {
 	struct ping_host_struct *ping_host = NULL;
 	struct addrinfo *gai = NULL;
-	uint32_t addrkey;
+	uint32_t addrkey = 0;
 	char ip_str[PING_MAX_HOSTLEN];
 	int port = -1;
 	FAST_PING_TYPE ping_type = FAST_PING_END;
-	unsigned int seed;
+	unsigned int seed = 0;
 	int ret = 0;
 
 	if (parse_ip(host, ip_str, &port) != 0) {
@@ -1036,7 +1062,6 @@ struct ping_host_struct *fast_ping_start(PING_TYPE type, const char *host, int c
 
 	ret = _fast_ping_get_addr_by_type(type, ip_str, port, &gai, &ping_type);
 	if (ret != 0) {
-		tlog(TLOG_ERROR, "get addr by type failed, host: %s", host);
 		goto errout;
 	}
 
@@ -1081,15 +1106,21 @@ struct ping_host_struct *fast_ping_start(PING_TYPE type, const char *host, int c
 	pthread_mutex_unlock(&ping.map_lock);
 
 	_fast_ping_host_get(ping_host);
+	_fast_ping_host_get(ping_host);
+	// for ping race condition, get reference count twice
 	if (_fast_ping_sendping(ping_host) != 0) {
 		goto errout_remove;
 	}
 
 	ping_host->run = 1;
 	freeaddrinfo(gai);
+	_fast_ping_host_put(ping_host);
 	return ping_host;
 errout_remove:
+	ping_host->ping_callback(ping_host, ping_host->host, PING_RESULT_ERROR, &ping_host->addr, ping_host->addr_len,
+							 ping_host->seq, ping_host->ttl, NULL, ping_host->error, ping_host->userptr);
 	fast_ping_stop(ping_host);
+	_fast_ping_host_put(ping_host);
 	ping_host = NULL;
 errout:
 	if (gai) {
@@ -1127,22 +1158,24 @@ static void tv_sub(struct timeval *out, struct timeval *in)
 static struct fast_ping_packet *_fast_ping_icmp6_packet(struct ping_host_struct *ping_host, struct msghdr *msg,
 														u_char *packet_data, int data_len)
 {
-	int icmp_len;
+	int icmp_len = 0;
 	struct fast_ping_packet *packet = (struct fast_ping_packet *)packet_data;
 	struct icmp6_hdr *icmp6 = &packet->icmp6;
-	struct cmsghdr *c;
+	struct cmsghdr *c = NULL;
 	int hops = 0;
 
 	for (c = CMSG_FIRSTHDR(msg); c; c = CMSG_NXTHDR(msg, c)) {
-		if (c->cmsg_level != IPPROTO_IPV6)
+		if (c->cmsg_level != IPPROTO_IPV6) {
 			continue;
+		}
 		switch (c->cmsg_type) {
 		case IPV6_HOPLIMIT:
 #ifdef IPV6_2292HOPLIMIT
 		case IPV6_2292HOPLIMIT:
 #endif
-			if (c->cmsg_len < CMSG_LEN(sizeof(int)))
+			if (c->cmsg_len < CMSG_LEN(sizeof(int))) {
 				continue;
+			}
 			memcpy(&hops, CMSG_DATA(c), sizeof(hops));
 		}
 	}
@@ -1159,10 +1192,12 @@ static struct fast_ping_packet *_fast_ping_icmp6_packet(struct ping_host_struct
 		return NULL;
 	}
 
+	if (ping.no_unprivileged_ping) {
 		if (icmp6->icmp6_id != ping.ident) {
 			tlog(TLOG_ERROR, "ident failed, %d:%d", icmp6->icmp6_id, ping.ident);
 			return NULL;
 		}
+	}
 
 	return packet;
 }
@@ -1171,15 +1206,10 @@ static struct fast_ping_packet *_fast_ping_icmp_packet(struct ping_host_struct *
 													   u_char *packet_data, int data_len)
 {
 	struct ip *ip = (struct ip *)packet_data;
-	struct fast_ping_packet *packet;
+	struct fast_ping_packet *packet = NULL;
-	struct icmp *icmp;
+	struct icmp *icmp = NULL;
-	int hlen;
+	int hlen = 0;
-	int icmp_len;
+	int icmp_len = 0;
-
-	if (ip->ip_p != IPPROTO_ICMP) {
-		tlog(TLOG_ERROR, "ip type faild, %d:%d", ip->ip_p, IPPROTO_ICMP);
-		return NULL;
-	}
 
 	hlen = ip->ip_hl << 2;
 	packet = (struct fast_ping_packet *)(packet_data + hlen);
@@ -1197,10 +1227,17 @@ static struct fast_ping_packet *_fast_ping_icmp_packet(struct ping_host_struct *
 		return NULL;
 	}
 
+	if (ping.no_unprivileged_ping) {
+		if (ip->ip_p != IPPROTO_ICMP) {
+			tlog(TLOG_ERROR, "ip type faild, %d:%d", ip->ip_p, IPPROTO_ICMP);
+			return NULL;
+		}
+
 		if (icmp->icmp_id != ping.ident) {
 			tlog(TLOG_ERROR, "ident failed, %d:%d", icmp->icmp_id, ping.ident);
 			return NULL;
 		}
+	}
 
 	return packet;
 }
@@ -1232,18 +1269,18 @@ errout:
 
 static int _fast_ping_process_icmp(struct ping_host_struct *ping_host, struct timeval *now)
 {
-	int len;
+	int len = 0;
 	u_char inpacket[ICMP_INPACKET_SIZE];
 	struct sockaddr_storage from;
-	struct ping_host_struct *recv_ping_host;
+	struct ping_host_struct *recv_ping_host = NULL;
 	struct fast_ping_packet *packet = NULL;
 	socklen_t from_len = sizeof(from);
-	uint32_t addrkey;
+	uint32_t addrkey = 0;
 	struct timeval tvresult = *now;
 	struct timeval *tvsend = NULL;
-	unsigned int sid;
+	unsigned int sid = 0;
-	unsigned int seq;
+	unsigned int seq = 0;
-	unsigned int cookie;
+	unsigned int cookie = 0;
 	struct msghdr msg;
 	struct iovec iov;
 	char ans_data[4096];
@@ -1306,7 +1343,7 @@ static int _fast_ping_process_icmp(struct ping_host_struct *ping_host, struct ti
 	if (recv_ping_host->ping_callback) {
 		recv_ping_host->ping_callback(recv_ping_host, recv_ping_host->host, PING_RESULT_RESPONSE, &recv_ping_host->addr,
 									  recv_ping_host->addr_len, recv_ping_host->seq, recv_ping_host->ttl, &tvresult,
-									  recv_ping_host->userptr);
+									  ping_host->error, recv_ping_host->userptr);
 	}
 
 	recv_ping_host->send = 0;
@@ -1340,7 +1377,8 @@ static int _fast_ping_process_tcp(struct ping_host_struct *ping_host, struct epo
 	tv_sub(&tvresult, tvsend);
 	if (ping_host->ping_callback) {
 		ping_host->ping_callback(ping_host, ping_host->host, PING_RESULT_RESPONSE, &ping_host->addr,
-								 ping_host->addr_len, ping_host->seq, ping_host->ttl, &tvresult, ping_host->userptr);
+								 ping_host->addr_len, ping_host->seq, ping_host->ttl, &tvresult, ping_host->error,
+								 ping_host->userptr);
 	}
 
 	ping_host->send = 0;
@@ -1359,20 +1397,20 @@ errout:
 
 static int _fast_ping_process_udp(struct ping_host_struct *ping_host, struct timeval *now)
 {
-	int len;
+	ssize_t len = 0;
 	u_char inpacket[ICMP_INPACKET_SIZE];
 	struct sockaddr_storage from;
-	struct ping_host_struct *recv_ping_host;
+	struct ping_host_struct *recv_ping_host = NULL;
 	struct ping_dns_head *dns_head = NULL;
 	socklen_t from_len = sizeof(from);
-	uint32_t addrkey;
+	uint32_t addrkey = 0;
 	struct timeval tvresult = *now;
 	struct timeval *tvsend = NULL;
-	unsigned int sid;
+	unsigned int sid = 0;
 	struct msghdr msg;
 	struct iovec iov;
 	char ans_data[4096];
-	struct cmsghdr *cmsg;
+	struct cmsghdr *cmsg = NULL;
 	int ttl = 0;
 
 	memset(&msg, 0, sizeof(msg));
@@ -1407,7 +1445,7 @@ static int _fast_ping_process_udp(struct ping_host_struct *ping_host, struct tim
 
 	from_len = msg.msg_namelen;
 	dns_head = (struct ping_dns_head *)inpacket;
-	if (len < sizeof(*dns_head)) {
+	if (len < (ssize_t)sizeof(*dns_head)) {
 		goto errout;
 	}
 
@@ -1436,7 +1474,7 @@ static int _fast_ping_process_udp(struct ping_host_struct *ping_host, struct tim
 	if (recv_ping_host->ping_callback) {
 		recv_ping_host->ping_callback(recv_ping_host, recv_ping_host->host, PING_RESULT_RESPONSE, &recv_ping_host->addr,
 									  recv_ping_host->addr_len, recv_ping_host->seq, recv_ping_host->ttl, &tvresult,
-									  recv_ping_host->userptr);
+									  ping_host->error, recv_ping_host->userptr);
 	}
 
 	recv_ping_host->send = 0;
@@ -1482,7 +1520,7 @@ static void _fast_ping_remove_all(void)
 	struct ping_host_struct *ping_host = NULL;
 	struct ping_host_struct *ping_host_tmp = NULL;
 	struct hlist_node *tmp = NULL;
-	int i;
+	unsigned long i = 0;
 
 	LIST_HEAD(remove_list);
 
@@ -1504,11 +1542,11 @@ static void _fast_ping_period_run(void)
 	struct ping_host_struct *ping_host = NULL;
 	struct ping_host_struct *ping_host_tmp = NULL;
 	struct hlist_node *tmp = NULL;
-	int i = 0;
+	unsigned long i = 0;
 	struct timeval now;
 	struct timezone tz;
 	struct timeval interval;
-	int64_t millisecond;
+	int64_t millisecond = 0;
 	gettimeofday(&now, &tz);
 	LIST_HEAD(action);
 
@@ -1544,7 +1582,7 @@ static void _fast_ping_period_run(void)
 		millisecond = interval.tv_sec * 1000 + interval.tv_usec / 1000;
 		if (millisecond >= ping_host->timeout && ping_host->send == 1) {
 			ping_host->ping_callback(ping_host, ping_host->host, PING_RESULT_TIMEOUT, &ping_host->addr,
-									 ping_host->addr_len, ping_host->seq, ping_host->ttl, &interval,
+									 ping_host->addr_len, ping_host->seq, ping_host->ttl, &interval, ping_host->error,
 									 ping_host->userptr);
 			ping_host->send = 0;
 		}
@@ -1574,8 +1612,8 @@ static void _fast_ping_period_run(void)
 static void *_fast_ping_work(void *arg)
 {
 	struct epoll_event events[PING_MAX_EVENTS + 1];
-	int num;
+	int num = 0;
-	int i;
+	int i = 0;
 	unsigned long now = {0};
 	struct timeval tvnow = {0};
 	int sleep = 100;
@@ -1585,7 +1623,7 @@ static void *_fast_ping_work(void *arg)
 	sleep_time = sleep;
 	now = get_tick_count() - sleep;
 	expect_time = now + sleep;
-	while (ping.run) {
+	while (atomic_read(&ping.run)) {
 		now = get_tick_count();
 		if (now >= expect_time) {
 			_fast_ping_period_run();
@@ -1625,7 +1663,7 @@ int fast_ping_init(void)
 {
 	pthread_attr_t attr;
 	int epollfd = -1;
-	int ret;
+	int ret = 0;
 	bool_print_log = 1;
 
 	if (ping.epoll_fd > 0) {
@@ -1645,8 +1683,9 @@ int fast_ping_init(void)
 	pthread_mutex_init(&ping.lock, NULL);
 	hash_init(ping.addrmap);
 	ping.epoll_fd = epollfd;
+	ping.no_unprivileged_ping = !has_unprivileged_ping();
 	ping.ident = (getpid() & 0XFFFF);
-	ping.run = 1;
+	atomic_set(&ping.run, 1);
 	ret = pthread_create(&ping.tid, &attr, _fast_ping_work, NULL);
 	if (ret != 0) {
 		tlog(TLOG_ERROR, "create ping work thread failed, %s\n", strerror(errno));
@@ -1655,10 +1694,11 @@ int fast_ping_init(void)
 
 	return 0;
 errout:
-	if (ping.tid > 0) {
+	if (ping.tid) {
 		void *retval = NULL;
-		ping.run = 0;
+		atomic_set(&ping.run, 0);
 		pthread_join(ping.tid, &retval);
+		ping.tid = 0;
 	}
 
 	if (epollfd) {
@@ -1696,10 +1736,11 @@ static void _fast_ping_close_fds(void)
 
 void fast_ping_exit(void)
 {
-	if (ping.tid > 0) {
+	if (ping.tid) {
 		void *ret = NULL;
-		ping.run = 0;
+		atomic_set(&ping.run, 0);
 		pthread_join(ping.tid, &ret);
+		ping.tid = 0;
 	}
 
 	_fast_ping_close_fds();

src/fast_ping.h

@@ -34,13 +34,14 @@ typedef enum {
 typedef enum {
 	PING_RESULT_RESPONSE = 1,
 	PING_RESULT_TIMEOUT = 2,
-	PING_RESULT_END = 3,
+	PING_RESULT_ERROR = 3,
+	PING_RESULT_END = 4,
 } FAST_PING_RESULT;
 
 struct ping_host_struct;
 typedef void (*fast_ping_result)(struct ping_host_struct *ping_host, const char *host, FAST_PING_RESULT result,
 								 struct sockaddr *addr, socklen_t addr_len, int seqno, int ttl, struct timeval *tv,
-								 void *userptr);
+								 int error, void *userptr);
 
 /* start ping */
 struct ping_host_struct *fast_ping_start(PING_TYPE type, const char *host, int count, int interval, int timeout,

src/http_parse.c

@@ -108,7 +108,7 @@ struct http_head_fields *http_head_first_fields(struct http_head *http_head)
 
 const char *http_head_get_fields_value(struct http_head *http_head, const char *name)
 {
-	unsigned long key;
+	uint32_t key;
 	struct http_head_fields *filed;
 
 	key = hash_string(name);
@@ -193,7 +193,7 @@ int http_head_get_data_len(struct http_head *http_head)
 
 static int _http_head_add_fields(struct http_head *http_head, char *name, char *value)
 {
-	unsigned long key = 0;
+	uint32_t key = 0;
 	struct http_head_fields *fields = NULL;
 	fields = malloc(sizeof(*fields));
 	if (fields == NULL) {

src/include/atomic.h

@@ -20,6 +20,11 @@
 #ifndef _GENERIC_ATOMIC_H
 #define _GENERIC_ATOMIC_H
 
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
+#define READ_ONCE(x) \
+({ typeof(x) ___x = ACCESS_ONCE(x); ___x; })
+
 /**
  * Atomic type.
  */
@@ -35,14 +40,20 @@ typedef struct {
  *
  * Atomically reads the value of @v.
  */
-#define atomic_read(v) ((v)->counter)
+static inline int atomic_read(const atomic_t *v)
+{
+	return READ_ONCE((v)->counter);
+}
 
 /**
  * Set atomic variable
  * @param v pointer of type atomic_t
  * @param i required value
  */
-#define atomic_set(v,i) (((v)->counter) = (i))
+static inline void atomic_set(atomic_t *v, int i)
+{
+    v->counter = i;
+}
 
 /**
  * Add to the atomic variable

src/include/conf.h

@@ -30,6 +30,7 @@
 #define CONF_RET_ERR -1
 #define CONF_RET_WARN -2
 #define CONF_RET_NOENT -3
+#define CONF_RET_BADCONF -4
 
 struct config_item {
 	const char *item;

src/include/hash.h

@@ -219,14 +219,16 @@ static inline uint32_t hash32_ptr(const void *ptr)
 	return (uint32_t)val;
 }
 
-static inline unsigned long
+static inline uint32_t hash_string(const char *s)
-hash_string(const char *str)
 {
-	unsigned long v = 0;
+    uint32_t h = 0;
-    const char *c;
+
-	for (c = str; *c; )
+    while (*s) {
-		v = (((v << 1) + (v >> 14)) ^ (*c++)) & 0x3fff;
+        h = h * 31 + *s;
-	return(v);
+        s++;
+    }
+
+    return h;
 }
 
 #endif /* _GENERIC_HASH_H */

src/lib/art.c

@@ -1016,7 +1016,7 @@ static void art_copy_key(art_leaf *leaf, unsigned char *key, int *key_len)
 		return;
 	}
 
-	len = leaf->key_len > *key_len ? *key_len : leaf->key_len;
+	len = (int)leaf->key_len > *key_len ? *key_len : (int)leaf->key_len;
 	memcpy(key, leaf->key, len);
 	*key_len = len;
 }

src/lib/conf.c

@@ -129,7 +129,7 @@ int conf_size(const char *item, void *data, int argc, char *argv[])
 	return 0;
 }
 
-void conf_getopt_reset(void)
+static void conf_getopt_reset(void)
 {
 	static struct option long_options[] = {{"-", 0, 0, 0}, {0, 0, 0, 0}};
 	int argc = 2;
@@ -144,7 +144,7 @@ void conf_getopt_reset(void)
 	optopt = 0;
 }
 
-int conf_parse_args(char *key, char *value, int *argc, char **argv)
+static int conf_parse_args(char *key, char *value, int *argc, char **argv)
 {
 	char *start = NULL;
 	char *ptr = value;
@@ -205,12 +205,9 @@ int conf_parse_args(char *key, char *value, int *argc, char **argv)
 	return 0;
 }
 
-void load_exit(void)
+void load_exit(void) {}
-{
-	return;
-}
 
-int load_conf_printf(const char *file, int lineno, int ret)
+static int load_conf_printf(const char *file, int lineno, int ret)
 {
 	if (ret != CONF_RET_OK) {
 		printf("process config file '%s' failed at line %d.", file, lineno);
@@ -224,15 +221,15 @@ int load_conf_printf(const char *file, int lineno, int ret)
 	return 0;
 }
 
-int load_conf_file(const char *file, struct config_item *items, conf_error_handler handler)
+static int load_conf_file(const char *file, struct config_item *items, conf_error_handler handler)
 {
 	FILE *fp = NULL;
 	char line[MAX_LINE_LEN];
 	char key[MAX_KEY_LEN];
 	char value[MAX_LINE_LEN];
 	int filed_num = 0;
-	int i;
+	int i = 0;
-	int argc;
+	int argc = 0;
 	char *argv[1024];
 	int ret = 0;
 	int call_ret = 0;
@@ -262,6 +259,7 @@ int load_conf_file(const char *file, struct config_item *items, conf_error_handl
 
 		/* if field format is not key = value, error */
 		if (filed_num != 2) {
+			handler(file, line_no, CONF_RET_BADCONF);
 			goto errout;
 		}
 

src/lib/radix.c

@@ -87,7 +87,7 @@ comp_with_mask(unsigned char *addr, unsigned char *dest, unsigned int mask)
 {
 	if (memcmp(addr, dest, mask / 8) == 0) {
 		unsigned int n = mask / 8;
-		unsigned int m = ((~0) << (8 - (mask % 8)));
+		unsigned int m = ((unsigned int)(~0) << (8 - (mask % 8)));
 
 		if (mask % 8 == 0 || (addr[n] & m) == (dest[n] & m))
 			return (1);
@@ -549,7 +549,7 @@ sanitise_mask(unsigned char *addr, unsigned int masklen, unsigned int maskbits)
 	unsigned int j = masklen % 8;
 
 	if (j != 0) {
-		addr[i] &= (~0) << (8 - j);
+		addr[i] &= (unsigned int)(~0) << (8 - j);
 		i++;
 	}
 	for (; i < maskbits / 8; i++)

src/smartdns.c

@@ -31,12 +31,15 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <libgen.h>
+#include <linux/capability.h>
 #include <openssl/err.h>
 #include <openssl/ssl.h>
+#include <pwd.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/prctl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <ucontext.h>
@@ -49,6 +52,78 @@
 
 static int verbose_screen;
 
+int capget(struct __user_cap_header_struct *header, struct __user_cap_data_struct *cap);
+int capset(struct __user_cap_header_struct *header, struct __user_cap_data_struct *cap);
+
+static int get_uid_gid(int *uid, int *gid)
+{
+	struct passwd *result = NULL;
+	struct passwd pwd;
+	char *buf = NULL;
+	ssize_t bufsize = 0;
+	int ret = -1;
+
+	if (dns_conf_user[0] == '\0') {
+		return -1;
+	}
+
+	bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
+	if (bufsize == -1) {
+		bufsize = 1024 * 16;
+	}
+
+	buf = malloc(bufsize);
+	if (buf == NULL) {
+		goto out;
+	}
+
+	ret = getpwnam_r(dns_conf_user, &pwd, buf, bufsize, &result);
+	if (ret != 0) {
+		goto out;
+	}
+
+	*uid = result->pw_uid;
+	*gid = result->pw_gid;
+
+out:
+	if (buf) {
+		free(buf);
+	}
+
+	return ret;
+}
+
+static int drop_root_privilege(void)
+{
+	struct __user_cap_data_struct cap;
+	struct __user_cap_header_struct header;
+	header.version = _LINUX_CAPABILITY_VERSION;
+	header.pid = 0;
+	int uid = 0;
+	int gid = 0;
+	int unused __attribute__((unused)) = 0;
+
+	if (get_uid_gid(&uid, &gid) != 0) {
+		return -1;
+	}
+
+	if (capget(&header, &cap) < 0) {
+		return -1;
+	}
+
+	prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
+	cap.effective |= (1 << CAP_NET_RAW | 1 << CAP_NET_ADMIN);
+	cap.permitted |= (1 << CAP_NET_RAW | 1 << CAP_NET_ADMIN);
+	unused = setuid(uid);
+	unused = setgid(gid);
+	if (capset(&header, &cap) < 0) {
+		return -1;
+	}
+
+	prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0);
+	return 0;
+}
+
 static void _help(void)
 {
 	/* clang-format off */
@@ -112,7 +187,7 @@ static int _smartdns_load_from_resolv(void)
 			continue;
 		}
 
-		if (strncmp(key, "nameserver", MAX_KEY_LEN) != 0) {
+		if (strncmp(key, "nameserver", MAX_KEY_LEN - 1) != 0) {
 			continue;
 		}
 
@@ -138,14 +213,14 @@ static int _smartdns_load_from_resolv(void)
 
 static int _smartdns_add_servers(void)
 {
-	int i = 0;
+	unsigned long i = 0;
 	int j = 0;
 	int ret = 0;
 	struct dns_server_groups *group = NULL;
 	struct dns_servers *server = NULL;
 	struct client_dns_server_flags flags;
 
-	for (i = 0; i < dns_conf_server_num; i++) {
+	for (i = 0; i < (unsigned int)dns_conf_server_num; i++) {
 		memset(&flags, 0, sizeof(flags));
 		switch (dns_conf_servers[i].type) {
 		case DNS_SERVER_UDP: {
@@ -250,7 +325,7 @@ static int _smartdns_destroy_ssl(void)
 
 static int _smartdns_init(void)
 {
-	int ret;
+	int ret = 0;
 	char *logfile = SMARTDNS_LOG_FILE;
 
 	if (dns_conf_log_file[0] != 0) {
@@ -322,9 +397,10 @@ static int _smartdns_run(void)
 
 static void _smartdns_exit(void)
 {
-	dns_server_exit();
+	tlog(TLOG_INFO, "smartdns exit...");
 	dns_client_exit();
 	fast_ping_exit();
+	dns_server_exit();
 	_smartdns_destroy_ssl();
 	tlog_exit();
 	dns_server_load_exit();
@@ -332,6 +408,7 @@ static void _smartdns_exit(void)
 
 static void _sig_exit(int signo)
 {
+	tlog(TLOG_INFO, "stop smartdns by signal %d", signo);
 	dns_server_stop();
 }
 
@@ -363,7 +440,7 @@ static void _sig_error_exit(int signo, siginfo_t *siginfo, void *ct)
 		 "%s %s)\n",
 		 signo, siginfo->si_code, siginfo->si_errno, siginfo->si_pid, getpid(), PC, (unsigned long)siginfo->si_addr,
 		 __DATE__, __TIME__, arch);
-
+	print_stack();
 	sleep(1);
 	_exit(0);
 }
@@ -374,7 +451,8 @@ static int sig_num = sizeof(sig_list) / sizeof(int);
 
 static void _reg_signal(void)
 {
-	struct sigaction act, old;
+	struct sigaction act;
+	struct sigaction old;
 	int i = 0;
 	act.sa_sigaction = _sig_error_exit;
 	sigemptyset(&act.sa_mask);
@@ -387,16 +465,21 @@ static void _reg_signal(void)
 
 int main(int argc, char *argv[])
 {
-	int ret;
+	int ret = 0;
 	int is_forground = 0;
-	int opt;
+	int opt = 0;
 	char config_file[MAX_LINE_LEN];
 	char pid_file[MAX_LINE_LEN];
 	int signal_ignore = 0;
+	sigset_t empty_sigblock;
 
 	safe_strncpy(config_file, SMARTDNS_CONF_FILE, MAX_LINE_LEN);
 	safe_strncpy(pid_file, SMARTDNS_PID_FILE, MAX_LINE_LEN);
 
+	/* patch for Asus router:  unblock all signal*/
+	sigemptyset(&empty_sigblock);
+	sigprocmask(SIG_SETMASK, &empty_sigblock, NULL);
+
 	while ((opt = getopt(argc, argv, "fhc:p:Svx")) != -1) {
 		switch (opt) {
 		case 'f':
@@ -424,6 +507,11 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (dns_server_load_conf(config_file) != 0) {
+		fprintf(stderr, "load config failed.\n");
+		goto errout;
+	}
+
 	if (is_forground == 0) {
 		if (daemon(0, 0) < 0) {
 			fprintf(stderr, "run daemon process failed, %s\n", strerror(errno));
@@ -440,10 +528,10 @@ int main(int argc, char *argv[])
 	}
 
 	signal(SIGPIPE, SIG_IGN);
-	if (dns_server_load_conf(config_file) != 0) {
+	signal(SIGINT, _sig_exit);
-		fprintf(stderr, "load config failed.\n");
+	signal(SIGTERM, _sig_exit);
-		goto errout;
+
-	}
+	drop_root_privilege();
 
 	ret = _smartdns_init();
 	if (ret != 0) {
@@ -451,8 +539,6 @@ int main(int argc, char *argv[])
 		goto errout;
 	}
 
-	signal(SIGINT, _sig_exit);
-	signal(SIGTERM, _sig_exit);
 	atexit(_smartdns_exit);
 
 	return _smartdns_run();

src/tlog.c

@@ -19,6 +19,7 @@
 #include <string.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
+#include <sys/syscall.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -45,6 +46,14 @@
 
 #define TLOG_SEGMENT_MAGIC 0xFF446154
 
+struct linux_dirent64 {
+    unsigned long long d_ino;
+    long long d_off;
+    unsigned short d_reclen;
+    unsigned char d_type;
+    char d_name[256];
+};
+
 struct tlog_log {
     char *buff;
     int buffsize;
@@ -71,7 +80,7 @@ struct tlog_log {
     int multi_log;
     int logscreen;
     int segment_log;
-    unsigned int max_line_size;
+    int max_line_size;
 
     tlog_output_func output_func;
     void *private_data;
@@ -317,7 +326,7 @@ int tlog_localtime(struct tlog_time *tm)
     return _tlog_gettime(tm);
 }
 
-tlog_log *tlog_get_root()
+tlog_log *tlog_get_root(void)
 {
     return tlog.root;
 }
@@ -504,9 +513,12 @@ static int _tlog_vprintf(struct tlog_log *log, vprint_callback print_callback, v
     if (len <= 0) {
         return -1;
     } else if (len >= log->max_line_size) {
-        strncpy(buff, "[LOG TOO LONG, DISCARD]\n", sizeof(buff));
+        len = log->max_line_size;
-        buff[sizeof(buff) - 1] = '\0';
+        buff[len - 1] = '\0';
-        len = strnlen(buff, sizeof(buff));
+        buff[len - 2] = '\n';
+        buff[len - 3] = '.';
+        buff[len - 4] = '.';
+        buff[len - 5] = '.';
     }
 
     pthread_mutex_lock(&tlog.lock);
@@ -919,47 +931,67 @@ static void _tlog_close_all_fd_by_res(void)
     }
 }
 
+static int _tlog_str_to_int(const char *str)
+{
+    int num = 0;
+
+    while (*str >= '0' && *str <= '9') {
+        num = num * 10 + (*str - '0');
+        ++str;
+    }
+
+    if (*str) {
+        return -1;
+    }
+
+    return num;
+}
+
 static void _tlog_close_all_fd(void)
 {
-    char path_name[PATH_MAX];
+#if defined(__linux__)
-    DIR *dir = NULL;
-    struct dirent *ent;
     int dir_fd = -1;
 
-    snprintf(path_name, sizeof(path_name), "/proc/self/fd/");
+    dir_fd = open("/proc/self/fd/", O_RDONLY | O_DIRECTORY);
-    dir = opendir(path_name);
+    if (dir_fd < 0) {
-    if (dir == NULL) {
         goto errout;
     }
 
-    dir_fd = dirfd(dir);
+    char buffer[sizeof(struct linux_dirent64)];
+    int bytes;
+    while ((bytes = syscall(SYS_getdents64, dir_fd,
+                (struct linux_dirent64 *)buffer,
+                sizeof(buffer)))
+        > 0) {
+        struct linux_dirent64 *entry;
+        int offset;
 
-    while ((ent = readdir(dir)) != NULL) {
+        for (offset = 0; offset < bytes; offset += entry->d_reclen) {
-        int fd = atoi(ent->d_name);
+            int fd;
-        if (fd < 0 || dir_fd == fd) {
+            entry = (struct linux_dirent64 *)(buffer + offset);
+            if ((fd = _tlog_str_to_int(entry->d_name)) < 0) {
                 continue;
             }
-        switch (fd) {
-        case STDIN_FILENO:
-        case STDOUT_FILENO:
-        case STDERR_FILENO:
-            continue;
-            break;
-        default:
-            break;
-        }
 
+            if (fd == dir_fd || fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO) {
+                continue;
+            }
             close(fd);
         }
+    }
 
-    closedir(dir);
+    close(dir_fd);
+
+    if (bytes < 0) {
+        goto errout;
+    }
 
     return;
 errout:
-    if (dir) {
+    if (dir_fd > 0) {
-        closedir(dir);
+        close(dir_fd);
     }
-
+#endif
     _tlog_close_all_fd_by_res();
     return;
 }
@@ -1059,7 +1091,7 @@ static int _tlog_archive_log(struct tlog_log *log)
     }
 }
 
-void _tlog_get_log_name_dir(struct tlog_log *log)
+static void _tlog_get_log_name_dir(struct tlog_log *log)
 {
     char log_file[PATH_MAX];
     if (log->fd > 0) {
@@ -1395,6 +1427,35 @@ static int _tlog_root_write_log(struct tlog_log *log, const char *buff, int buff
     return tlog.output_func(&empty_info.info, buff, bufflen, tlog_get_private(log));
 }
 
+static void tlog_wait_zip_fini(void)
+{
+    tlog_log *next;
+    if (tlog.root == NULL) {
+        return;
+    }
+
+    int wait_zip = 1;
+    int time_out = 0;
+    while (wait_zip) {
+        wait_zip = 0;
+        time_out++;
+        next = tlog.log;
+        while (next) {
+            if (next->zip_pid > 0 && wait_zip == 0) {
+                wait_zip = 1;
+                usleep(1000);
+            }
+
+            if (kill(next->zip_pid, 0) != 0 || time_out >= 5000) {
+                next->zip_pid = -1;
+            }
+            next = next->next;
+        }
+    }
+
+    return;
+}
+
 static void *_tlog_work(void *arg)
 {
     int log_len = 0;
@@ -1408,6 +1469,9 @@ static void *_tlog_work(void *arg)
 
     unused = arg;
 
+    // for child process
+    tlog_wait_zip_fini();
+
     while (1) {
         log_len = 0;
         log_extlen = 0;
@@ -1680,6 +1744,12 @@ static void tlog_fork_prepare(void)
     }
 
     pthread_mutex_lock(&tlog.lock);
+    tlog_log *next;
+    next = tlog.log;
+    while (next) {
+        next->multi_log = 1;
+        next = next->next;
+    }
 }
 
 static void tlog_fork_parent(void)
@@ -1699,6 +1769,16 @@ static void tlog_fork_child(void)
         return;
     }
 
+    next = tlog.log;
+    while (next) {
+        next->start = 0;
+        next->end = 0;
+        next->ext_end = 0;
+        next->dropped = 0;
+        next->filesize = 0;
+        next = next->next;
+    }
+
     pthread_attr_init(&attr);
     int ret = pthread_create(&tlog.tid, &attr, _tlog_work, NULL);
     if (ret != 0) {
@@ -1762,10 +1842,11 @@ int tlog_init(const char *logfile, int maxlogsize, int maxlogcount, int buffsize
     }
     return 0;
 errout:
-    if (tlog.tid > 0) {
+    if (tlog.tid) {
         void *retval = NULL;
         tlog.run = 0;
         pthread_join(tlog.tid, &retval);
+        tlog.tid = 0;
     }
 
     pthread_cond_destroy(&tlog.cond);
@@ -1779,13 +1860,14 @@ errout:
 
 void tlog_exit(void)
 {
-    if (tlog.tid > 0) {
+    if (tlog.tid) {
         void *ret = NULL;
         tlog.run = 0;
         pthread_mutex_lock(&tlog.lock);
         pthread_cond_signal(&tlog.cond);
         pthread_mutex_unlock(&tlog.lock);
         pthread_join(tlog.tid, &ret);
+        tlog.tid = 0;
     }
 
     tlog.root = NULL;
@@ -1795,4 +1877,7 @@ void tlog_exit(void)
 
     pthread_cond_destroy(&tlog.cond);
     pthread_mutex_destroy(&tlog.lock);
+
+    tlog_format = NULL;
+    tlog.is_wait = 0;
 }

src/tlog.h

@@ -8,6 +8,7 @@
 #define TLOG_H
 #include <stdarg.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 
 #ifdef __cplusplus
 #include <functional>
@@ -78,7 +79,9 @@ level: Current log Levels
 format: Log formats
 */
 #ifndef BASE_FILE_NAME
-#define BASE_FILE_NAME __FILE__
+#define BASE_FILE_NAME                                                     \
+  (__builtin_strrchr(__FILE__, '/') ? __builtin_strrchr(__FILE__, '/') + 1 \
+                                    : __FILE__)
 #endif
 #define tlog(level, format, ...) tlog_ext(level, BASE_FILE_NAME, __LINE__, __func__, NULL, format, ##__VA_ARGS__)
 

src/util.c

@@ -21,11 +21,14 @@
 #endif
 #include "util.h"
 #include "dns_conf.h"
+#include "tlog.h"
 #include <arpa/inet.h>
+#include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <linux/capability.h>
+#include <linux/limits.h>
 #include <linux/netlink.h>
 #include <netinet/tcp.h>
 #include <openssl/crypto.h>
@@ -33,12 +36,14 @@
 #include <pthread.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <sys/prctl.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
+#include <unwind.h>
 
 #define TMP_BUFF_LEN_32 32
 
@@ -73,7 +78,7 @@
 
 #define NETLINK_ALIGN(len) (((len) + 3) & ~(3))
 
-#define BUFF_SZ 256
+#define BUFF_SZ 1024
 
 struct ipset_netlink_attr {
 	unsigned short len;
@@ -104,12 +109,12 @@ char *gethost_by_addr(char *host, int maxsize, struct sockaddr *addr)
 	host[0] = 0;
 	switch (addr_store->ss_family) {
 	case AF_INET: {
-		struct sockaddr_in *addr_in;
+		struct sockaddr_in *addr_in = NULL;
 		addr_in = (struct sockaddr_in *)addr;
 		inet_ntop(AF_INET, &addr_in->sin_addr, host, maxsize);
 	} break;
 	case AF_INET6: {
-		struct sockaddr_in6 *addr_in6;
+		struct sockaddr_in6 *addr_in6 = NULL;
 		addr_in6 = (struct sockaddr_in6 *)addr;
 		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
 			struct sockaddr_in addr_in4;
@@ -129,7 +134,7 @@ errout:
 	return NULL;
 }
 
-int getaddr_by_host(char *host, struct sockaddr *addr, socklen_t *addr_len)
+int getaddr_by_host(const char *host, struct sockaddr *addr, socklen_t *addr_len)
 {
 	struct addrinfo hints;
 	struct addrinfo *result = NULL;
@@ -172,14 +177,14 @@ int getsocknet_inet(int fd, struct sockaddr *addr, socklen_t *addr_len)
 
 	switch (addr_store.ss_family) {
 	case AF_INET: {
-		struct sockaddr_in *addr_in;
+		struct sockaddr_in *addr_in = NULL;
 		addr_in = (struct sockaddr_in *)addr;
 		addr_in->sin_family = AF_INET;
 		*addr_len = sizeof(struct sockaddr_in);
 		memcpy(addr, addr_in, sizeof(struct sockaddr_in));
 	} break;
 	case AF_INET6: {
-		struct sockaddr_in6 *addr_in6;
+		struct sockaddr_in6 *addr_in6 = NULL;
 		addr_in6 = (struct sockaddr_in6 *)addr;
 		if (IN6_IS_ADDR_V4MAPPED(&addr_in6->sin6_addr)) {
 			struct sockaddr_in addr_in4;
@@ -407,7 +412,7 @@ int parse_uri(char *value, char *scheme, char *host, int *port, char *path)
 	};
 
 	field_len = host_end - process_ptr;
-	if (field_len >= sizeof(host_name)) {
+	if (field_len >= (int)sizeof(host_name)) {
 		return -1;
 	}
 	memcpy(host_name, process_ptr, field_len);
@@ -427,7 +432,7 @@ int parse_uri(char *value, char *scheme, char *host, int *port, char *path)
 
 int set_fd_nonblock(int fd, int nonblock)
 {
-	int ret;
+	int ret = 0;
 	int flags = fcntl(fd, F_GETFL);
 
 	if (flags == -1) {
@@ -469,6 +474,31 @@ char *reverse_string(char *output, const char *input, int len, int to_lower_case
 	return begin;
 }
 
+char *to_lower_case(char *output, const char *input, int len)
+{
+	char *begin = output;
+	int i = 0;
+	if (len <= 0) {
+		*output = 0;
+		return output;
+	}
+
+	len--;
+	while (i < len && *(input + i) != '\0') {
+		*output = *(input + i);
+		if (*output >= 'A' && *output <= 'Z') {
+			/* To lower case */
+			*output = *output + 32;
+		}
+		output++;
+		i++;
+	}
+
+	*output = 0;
+
+	return begin;
+}
+
 static inline void _ipset_add_attr(struct nlmsghdr *netlink_head, uint16_t type, size_t len, const void *data)
 {
 	struct ipset_netlink_attr *attr = (void *)netlink_head + NETLINK_ALIGN(netlink_head->nlmsg_len);
@@ -494,7 +524,7 @@ static int _ipset_socket_init(void)
 	return 0;
 }
 
-static int _ipset_support_timeout(const char *ipsetname)
+static int _ipset_support_timeout(void)
 {
 	if (dns_conf_ipset_timeout_enable) {
 		return 0;
@@ -506,14 +536,15 @@ static int _ipset_support_timeout(const char *ipsetname)
 static int _ipset_operate(const char *ipsetname, const unsigned char addr[], int addr_len, unsigned long timeout,
 						  int operate)
 {
-	struct nlmsghdr *netlink_head;
+	struct nlmsghdr *netlink_head = NULL;
-	struct ipset_netlink_msg *netlink_msg;
+	struct ipset_netlink_msg *netlink_msg = NULL;
 	struct ipset_netlink_attr *nested[3];
 	char buffer[BUFF_SZ];
-	uint8_t proto;
+	uint8_t proto = 0;
-	ssize_t rc;
+	ssize_t rc = 0;
 	int af = 0;
 	static const struct sockaddr_nl snl = {.nl_family = AF_NETLINK};
+	uint32_t expire = 0;
 
 	if (addr_len != IPV4_ADDR_LEN && addr_len != IPV6_ADDR_LEN) {
 		errno = EINVAL;
@@ -567,9 +598,9 @@ static int _ipset_operate(const char *ipsetname, const unsigned char addr[], int
 					addr);
 	nested[1]->len = (void *)buffer + NETLINK_ALIGN(netlink_head->nlmsg_len) - (void *)nested[1];
 
-	if (timeout > 0 && _ipset_support_timeout(ipsetname) == 0) {
+	if (timeout > 0 && _ipset_support_timeout() == 0) {
-		timeout = htonl(timeout);
+		expire = htonl(timeout);
-		_ipset_add_attr(netlink_head, IPSET_ATTR_TIMEOUT | NLA_F_NET_BYTEORDER, sizeof(timeout), &timeout);
+		_ipset_add_attr(netlink_head, IPSET_ATTR_TIMEOUT | NLA_F_NET_BYTEORDER, sizeof(expire), &expire);
 	}
 
 	nested[0]->len = (void *)buffer + NETLINK_ALIGN(netlink_head->nlmsg_len) - (void *)nested[0];
@@ -604,22 +635,30 @@ int ipset_del(const char *ipsetname, const unsigned char addr[], int addr_len)
 
 unsigned char *SSL_SHA256(const unsigned char *d, size_t n, unsigned char *md)
 {
-	SHA256_CTX c;
 	static unsigned char m[SHA256_DIGEST_LENGTH];
 
-	if (md == NULL)
+	if (md == NULL) {
 		md = m;
-	SHA256_Init(&c);
+	}
-	SHA256_Update(&c, d, n);
+
-	SHA256_Final(md, &c);
+	EVP_MD_CTX* ctx = EVP_MD_CTX_create();
-	OPENSSL_cleanse(&c, sizeof(c));
+	if (ctx == NULL) {
+		return NULL;
+	}
+
+	EVP_MD_CTX_init(ctx);
+	EVP_DigestInit_ex(ctx, EVP_sha256(), NULL);
+	EVP_DigestUpdate(ctx, d, n);
+	EVP_DigestFinal_ex(ctx, m, NULL);
+	EVP_MD_CTX_destroy(ctx);
+
 	return (md);
 }
 
 int SSL_base64_decode(const char *in, unsigned char *out)
 {
 	size_t inlen = strlen(in);
-	int outlen;
+	int outlen = 0;
 
 	if (inlen == 0) {
 		return 0;
@@ -642,8 +681,8 @@ errout:
 
 int create_pid_file(const char *pid_file)
 {
-	int fd;
+	int fd = 0;
-	int flags;
+	int flags = 0;
 	char buff[TMP_BUFF_LEN_32];
 
 	/*  create pid file, and lock this file */
@@ -708,7 +747,7 @@ static __attribute__((unused)) void _pthreads_locking_callback(int mode, int typ
 
 static __attribute__((unused)) unsigned long _pthreads_thread_id(void)
 {
-	unsigned long ret;
+	unsigned long ret = 0;
 
 	ret = (unsigned long)pthread_self();
 	return (ret);
@@ -716,16 +755,18 @@ static __attribute__((unused)) unsigned long _pthreads_thread_id(void)
 
 void SSL_CRYPTO_thread_setup(void)
 {
-	int i;
+	int i = 0;
 
 	lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t));
 	lock_count = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(long));
 	if (!lock_cs || !lock_count) {
 		/* Nothing we can do about this...void function! */
-		if (lock_cs)
+		if (lock_cs) {
 			OPENSSL_free(lock_cs);
-		if (lock_count)
+		}
+		if (lock_count) {
 			OPENSSL_free(lock_count);
+		}
 		return;
 	}
 	for (i = 0; i < CRYPTO_num_locks(); i++) {
@@ -733,13 +774,17 @@ void SSL_CRYPTO_thread_setup(void)
 		pthread_mutex_init(&(lock_cs[i]), NULL);
 	}
 
+#if OPENSSL_API_COMPAT < 0x10000000
 	CRYPTO_set_id_callback(_pthreads_thread_id);
+#else
+	CRYPTO_THREADID_set_callback(_pthreads_thread_id);
+#endif
 	CRYPTO_set_locking_callback(_pthreads_locking_callback);
 }
 
 void SSL_CRYPTO_thread_cleanup(void)
 {
-	int i;
+	int i = 0;
 
 	CRYPTO_set_locking_callback(NULL);
 	for (i = 0; i < CRYPTO_num_locks(); i++) {
@@ -776,18 +821,20 @@ static int parse_server_name_extension(const char *, size_t, char *, const char
  */
 int parse_tls_header(const char *data, size_t data_len, char *hostname, const char **hostname_ptr)
 {
-	char tls_content_type;
+	char tls_content_type = 0;
-	char tls_version_major;
+	char tls_version_major = 0;
-	char tls_version_minor;
+	char tls_version_minor = 0;
 	size_t pos = TLS_HEADER_LEN;
-	size_t len;
+	size_t len = 0;
 
-	if (hostname == NULL)
+	if (hostname == NULL) {
 		return -3;
+	}
 
 	/* Check that our TCP payload is at least large enough for a TLS header */
-	if (data_len < TLS_HEADER_LEN)
+	if (data_len < TLS_HEADER_LEN) {
 		return -1;
+	}
 
 	/* SSL 2.0 compatible Client Hello
 	 *
@@ -815,8 +862,9 @@ int parse_tls_header(const char *data, size_t data_len, char *hostname, const ch
 	data_len = MIN(data_len, len);
 
 	/* Check we received entire TLS record length */
-	if (data_len < len)
+	if (data_len < len) {
 		return -1;
+	}
 
 	/*
 	 * Handshake
@@ -838,20 +886,23 @@ int parse_tls_header(const char *data, size_t data_len, char *hostname, const ch
 	pos += 38;
 
 	/* Session ID */
-	if (pos + 1 > data_len)
+	if (pos + 1 > data_len) {
 		return -5;
+	}
 	len = (unsigned char)data[pos];
 	pos += 1 + len;
 
 	/* Cipher Suites */
-	if (pos + 2 > data_len)
+	if (pos + 2 > data_len) {
 		return -5;
+	}
 	len = ((unsigned char)data[pos] << 8) + (unsigned char)data[pos + 1];
 	pos += 2 + len;
 
 	/* Compression Methods */
-	if (pos + 1 > data_len)
+	if (pos + 1 > data_len) {
 		return -5;
+	}
 	len = (unsigned char)data[pos];
 	pos += 1 + len;
 
@@ -860,20 +911,22 @@ int parse_tls_header(const char *data, size_t data_len, char *hostname, const ch
 	}
 
 	/* Extensions */
-	if (pos + 2 > data_len)
+	if (pos + 2 > data_len) {
 		return -5;
+	}
 	len = ((unsigned char)data[pos] << 8) + (unsigned char)data[pos + 1];
 	pos += 2;
 
-	if (pos + len > data_len)
+	if (pos + len > data_len) {
 		return -5;
+	}
 	return parse_extensions(data + pos, len, hostname, hostname_ptr);
 }
 
 static int parse_extensions(const char *data, size_t data_len, char *hostname, const char **hostname_ptr)
 {
 	size_t pos = 0;
-	size_t len;
+	size_t len = 0;
 
 	/* Parse each 4 bytes for the extension header */
 	while (pos + 4 <= data_len) {
@@ -884,15 +937,17 @@ static int parse_extensions(const char *data, size_t data_len, char *hostname, c
 		if (data[pos] == 0x00 && data[pos + 1] == 0x00) {
 			/* There can be only one extension of each type, so we break
 			 * our state and move p to beinnging of the extension here */
-			if (pos + 4 + len > data_len)
+			if (pos + 4 + len > data_len) {
 				return -5;
+			}
 			return parse_server_name_extension(data + pos + 4, len, hostname, hostname_ptr);
 		}
 		pos += 4 + len; /* Advance to the next extension header */
 	}
 	/* Check we ended where we expected to */
-	if (pos != data_len)
+	if (pos != data_len) {
 		return -5;
+	}
 
 	return -2;
 }
@@ -900,13 +955,14 @@ static int parse_extensions(const char *data, size_t data_len, char *hostname, c
 static int parse_server_name_extension(const char *data, size_t data_len, char *hostname, const char **hostname_ptr)
 {
 	size_t pos = 2; /* skip server name list length */
-	size_t len;
+	size_t len = 0;
 
 	while (pos + 3 < data_len) {
 		len = ((unsigned char)data[pos + 1] << 8) + (unsigned char)data[pos + 2];
 
-		if (pos + 3 + len > data_len)
+		if (pos + 3 + len > data_len) {
 			return -5;
+		}
 
 		switch (data[pos]) { /* name type */
 		case 0x00:           /* host_name */
@@ -923,8 +979,9 @@ static int parse_server_name_extension(const char *data, size_t data_len, char *
 		pos += 3 + len;
 	}
 	/* Check we ended where we expected to */
-	if (pos != data_len)
+	if (pos != data_len) {
 		return -5;
+	}
 
 	return -2;
 }
@@ -932,8 +989,12 @@ static int parse_server_name_extension(const char *data, size_t data_len, char *
 void get_compiled_time(struct tm *tm)
 {
 	char s_month[5];
-	int month, day, year;
+	int month = 0;
-	int hour, min, sec;
+	int day = 0;
+	int year = 0;
+	int hour = 0;
+	int min = 0;
+	int sec = 0;
 	static const char *month_names = "JanFebMarAprMayJunJulAugSepOctNovDec";
 
 	sscanf(__DATE__, "%4s %d %d", s_month, &day, &year);
@@ -951,8 +1012,9 @@ void get_compiled_time(struct tm *tm)
 int is_numeric(const char *str)
 {
 	while (*str != '\0') {
-		if (*str < '0' || *str > '9')
+		if (*str < '0' || *str > '9') {
 			return -1;
+		}
 		str++;
 	}
 	return 0;
@@ -969,6 +1031,25 @@ int has_network_raw_cap(void)
 	return 1;
 }
 
+int has_unprivileged_ping(void)
+{
+	int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
+	if (fd < 0) {
+		return 0;
+	}
+
+	close(fd);
+
+	fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6);
+	if (fd < 0) {
+		return 0;
+	}
+
+	close(fd);
+
+	return 1;
+}
+
 int set_sock_keepalive(int fd, int keepidle, int keepinterval, int keepcnt)
 {
 	const int yes = 1;
@@ -1009,3 +1090,91 @@ uint64_t get_free_space(const char *path)
 
 	return size;
 }
+
+struct backtrace_state {
+	void **current;
+	void **end;
+};
+
+static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context *context, void *arg)
+{
+	struct backtrace_state *state = (struct backtrace_state *)(arg);
+	uintptr_t pc = _Unwind_GetIP(context);
+	if (pc) {
+		if (state->current == state->end) {
+			return _URC_END_OF_STACK;
+		}
+
+		*state->current++ = (void *)(pc);
+	}
+	return _URC_NO_REASON;
+}
+
+void print_stack(void)
+{
+	const size_t max_buffer = 30;
+	void *buffer[max_buffer];
+	int idx = 0;
+
+	struct backtrace_state state = {buffer, buffer + max_buffer};
+	_Unwind_Backtrace(unwind_callback, &state);
+	int frame_num = state.current - buffer;
+	if (frame_num == 0) {
+		return;
+	}
+
+	tlog(TLOG_FATAL, "Stack:");
+	for (idx = 0; idx < frame_num; ++idx) {
+		const void *addr = buffer[idx];
+		const char *symbol = "";
+
+		Dl_info info;
+		memset(&info, 0, sizeof(info));
+		if (dladdr(addr, &info) && info.dli_sname) {
+			symbol = info.dli_sname;
+		}
+
+		void *offset = (void *)((char *)(addr) - (char *)(info.dli_fbase));
+		tlog(TLOG_FATAL, "#%.2d: %p %s() from %s+%p", idx + 1, addr, symbol, info.dli_fname, offset);
+	}
+}
+
+void bug_ext(const char *file, int line, const char *func, const char *errfmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, errfmt);
+	tlog_vext(TLOG_FATAL, file, line, func, NULL, errfmt, ap);
+	va_end(ap);
+
+	print_stack();
+	/* trigger BUG */
+	sleep(1);
+	raise(SIGSEGV);
+
+	while (true) {
+		sleep(1);
+	};
+}
+
+int write_file(const char *filename, void *data, int data_len)
+{
+	int fd = open(filename, O_WRONLY|O_CREAT, 0644);
+	if (fd < 0) {
+		return -1;
+	}
+
+	int len = write(fd, data, data_len);
+	if (len < 0) {
+		goto errout;
+	}
+
+	close(fd);
+	return 0;
+errout:
+	if (fd > 0) {
+		close(fd);
+	}
+
+	return -1;
+}

src/util.h

@@ -45,11 +45,21 @@ extern "C" {
 #define PORT_NOT_DEFINED -1
 #define MAX_IP_LEN 64
 
+#ifndef BASE_FILE_NAME
+#define BASE_FILE_NAME                                                     \
+  (__builtin_strrchr(__FILE__, '/') ? __builtin_strrchr(__FILE__, '/') + 1 \
+                                    : __FILE__)
+#endif
+#define BUG(format, ...) bug_ext(BASE_FILE_NAME, __LINE__, __func__, format, ##__VA_ARGS__)
+
+void bug_ext(const char *file, int line, const char *func, const char *errfmt, ...)
+	__attribute__((format(printf, 4, 5))) __attribute__((nonnull(4)));
+
 unsigned long get_tick_count(void);
 
 char *gethost_by_addr(char *host, int maxsize, struct sockaddr *addr);
 
-int getaddr_by_host(char *host, struct sockaddr *addr, socklen_t *addr_len);
+int getaddr_by_host(const char *host, struct sockaddr *addr, socklen_t *addr_len);
 
 int getsocknet_inet(int fd, struct sockaddr *addr, socklen_t *addr_len);
 
@@ -65,6 +75,8 @@ int set_fd_nonblock(int fd, int nonblock);
 
 char *reverse_string(char *output, const char *input, int len, int to_lower_case);
 
+char *to_lower_case(char *output, const char *input, int len);
+
 void print_stack(void);
 
 int ipset_add(const char *ipsetname, const unsigned char addr[], int addr_len, unsigned long timeout);
@@ -102,12 +114,18 @@ int is_numeric(const char *str);
 
 int has_network_raw_cap(void);
 
+int has_unprivileged_ping(void);
+
 int set_sock_keepalive(int fd, int keepidle, int keepinterval, int keepcnt);
 
 int set_sock_lingertime(int fd, int time);
 
 uint64_t get_free_space(const char *path);
 
+void print_stack(void);
+
+int write_file(const char *filename, void *data, int data_len);
+
 #ifdef __cplusplus
 }
 #endif /*__cplusplus */

systemd/smartdns.service.in

@@ -9,10 +9,9 @@ Type=forking
 PIDFile=@RUNSTATEDIR@/smartdns.pid
 EnvironmentFile=@SYSCONFDIR@/default/smartdns
 ExecStart=@SBINDIR@/smartdns -p @RUNSTATEDIR@/smartdns.pid $SMART_DNS_OPTS 
-KillMode=process
 Restart=always
 RestartSec=2
-TimeoutStopSec=5
+TimeoutStopSec=15
 
 [Install]
 WantedBy=multi-user.target