Update readme

smartdns: support no create pid file.
fast_ping: supress error log
2022-08-06 16:24:33 +08:00 · 2022-08-05 22:13:26 +08:00 · 2022-08-04 21:40:18 +08:00 · 2022-08-01 21:58:51 +08:00 · 2022-07-31 15:49:10 +08:00 · 2022-07-25 22:54:27 +08:00
18 changed files with 677 additions and 131 deletions
--- a/40
+++ b/40
@@ -1,35 +1,41 @@
 FROM ubuntu:latest as smartdns-builder
 LABEL previous-stage=smartdns-builder
-COPY . /smartdns/
+
+# prepare builder
+ARG OPENSSL_VER=1.1.1f
 RUN apt update && \
-    apt install -y perl wget make musl-tools musl-dev && \
-    OPENSSL_VER=1.1.1f && \
-    mkdir /build -p && \
+    apt install -y perl curl make musl-tools musl-dev && \
    ln -s /usr/include/linux /usr/include/$(uname -m)-linux-musl && \
    ln -s /usr/include/asm-generic /usr/include/$(uname -m)-linux-musl && \
    ln -s /usr/include/$(uname -m)-linux-gnu/asm /usr/include/$(uname -m)-linux-musl && \
-    cd /build && \
-    wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_${OPENSSL_VER}.orig.tar.gz && \
-    tar xf openssl_${OPENSSL_VER}.orig.tar.gz && \
-    cd openssl-${OPENSSL_VER} && \
+    \
+    mkdir -p /build/openssl && \
+    cd /build/openssl && \
+    curl -sSL http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_${OPENSSL_VER}.orig.tar.gz | tar --strip-components=1 -zxv && \
+    \
    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; \
+        ./config --prefix=/opt/build no-tests ; \
    fi && \
    make all -j8 && make install_sw && \
-    cd /smartdns && \
+    cd / && rm -rf /build
+
+# do make
+COPY . /build/smartdns/
+RUN cd /build/smartdns && \
+    export CC=musl-gcc && \
    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
+    \
+    ( cd package && tar -xvf *.tar.gz && chmod a+x smartdns/etc/init.d/smartdns ) && \
+    \
+    mkdir -p /release/var/log /release/var/run && \
+    cp package/smartdns/etc /release/ -a && \
+    cp package/smartdns/usr /release/ -a && \
+    cd / && rm -rf /build

 FROM busybox:latest
 COPY --from=smartdns-builder /release/ /
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -548,6 +548,8 @@ rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms

 ## 配置文件说明

+配置建议：**smartdns默认已设置为最优模式，适合大部分场景的DNS查询体验改善，一般情况只需要增加上游服务器地址即可，无需做其他配置修改；如有其他配置修改，请务必了解其用途，避免修改后起到反作用。**
+
 | 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 |
@@ -563,11 +565,11 @@ rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
 | 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 |
 | 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-level | 设置日志级别 | error | fatal、error、warn、notice、info 或 debug | log-level error |
-| 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 |
+| log-file | 日志文件路径 | /var/log/smartdns/smartdns.log | 合法路径字符串 | log-file /var/log/smartdns/smartdns.log |
 | log-size | 日志大小 | 128K | 数字 + K、M 或 G | log-size 128K |
 | log-num | 日志归档个数 | 2 | 大于等于 0 的数字 | log-num 2 |
 | audit-enable | 设置审计启用 | no | [yes\|no] | audit-enable yes |
-| 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 |
+| audit-file | 审计文件路径 | /var/log/smartdns/smartdns-audit.log | 合法路径字符串 | audit-file /var/log/smartdns/smartdns-audit.log |
 | audit-size | 审计大小 | 128K | 数字 + K、M 或 G | audit-size 128K |
 | audit-num | 审计归档个数 | 2 | 大于等于 0 的数字 | audit-num 2 |
 | conf-file | 附加配置文件 | 无 | 合法路径字符串 | conf-file /etc/smartdns/smartdns.more.conf |
@@ -576,6 +578,7 @@ rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
 | 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 |
 | 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 |
 | speed-check-mode | 测速模式选择 | 无 | [ping\|tcp:[80]\|none] | speed-check-mode ping,tcp:80,tcp:443 |
+| response-mode | 首次查询响应模式 | first-ping |模式：[fisrt-ping\|fastest-ip\|first-response]<br> [first-ping]: 最快ping响应地址模式，DNS上游最快查询时延+ping时延最短，查询等待与链接体验最佳;<br>[fastest-ip]: 最快IP地址模式，查询到的所有IP地址中ping最短的IP。需等待IP测速; <br>[first-response]: 最快响应的DNS结果，DNS查询等待时间最短，返回的IP地址可能不是最快。| response-mode first-ping |
 | 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 |
 | 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 |
 | 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:- |
@@ -594,6 +597,7 @@ rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
 | 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] |
+| user | 进程运行用户 | root | user [username] | user nobody |
 | 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 |

--- a/ReadMe_en.md
+++ b/ReadMe_en.md
@@ -501,11 +501,11 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |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-file|log path|/var/log/smartdns/smartdns.log|File Pah|log-file /var/log/smartdns/smartdns.log
 |log-size|log size|128K|number+K,M,G|log-size 128K
 |log-num|archived log number|2|Integer|log-num 2
 |audit-enable|audit log enable|no|[yes\|no]|audit-enable yes
-|audit-file|audit log file|/var/log/smartdns-audit.log|File Path|audit-file /var/log/smartdns-audit.log
+|audit-file|audit log file|/var/log/smartdns/smartdns-audit.log|File Path|audit-file /var/log/smartdns/smartdns-audit.log
 |audit-size|audit log size|128K|number+K,M,G|audit-size 128K
 |audit-num|archived audit log number|2|Integer|audit-num 2
 |conf-file|additional conf file|None|File path|conf-file /etc/smartdns/smartdns.more.conf
@@ -514,6 +514,7 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |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:80,tcp:443
+|response-mode|First query response mode|first-ping|Mode: [fisrt-ping\|fastest-ip\|first-response]<br> [first-ping]: The fastest dns + ping response mode, DNS query delay + ping delay is the shortest;<br>[fastest-ip]: The fastest IP address mode, return the fastest ip address, may take some time to test speed. <br>[first-response]: The fastest response DNS result mode, the DNS query waiting time is the shortest. | response-mode first-ping |
 |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:-
@@ -532,6 +533,7 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |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|yes|[yes\|no]|dualstack-ip-selection yes
 |dualstack-ip-selection-threshold|Dualstack ip select threadhold|15ms|millisecond|dualstack-ip-selection-threshold [0-1000]
+|user|run as user|root|user [username]|user nobody
 |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

--- a/etc/smartdns/smartdns.conf
+++ b/etc/smartdns/smartdns.conf
@@ -4,7 +4,7 @@
 #   server-name smartdns
 #

-# dns server run ser
+# dns server run user
 # user [username]
 # example: run as nobody
 #   user nobody
@@ -109,7 +109,7 @@ cache-size 16384
 # 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
+# rr-ttl-reply-max: maximum reply ttl for resource record
 # example:
 # rr-ttl 300
 # rr-ttl-min 60
@@ -120,13 +120,17 @@ cache-size 16384
 # example:
 # max-reply-ip-num 1

+# response mode
+# Experimental feature
+# response-mode [first-ping|fastest-ip|fastest-response]
+
 # set log level
 # log-level: [level], level=fatal, error, warn, notice, info, debug
 # log-file: file path of log file.
 # log-size: size of each log file, support k,m,g
 # log-num: number of logs
 log-level info
-# log-file /var/log/smartdns.log
+# log-file /var/log/smartdns/smartdns.log
 # log-size 128k
 # log-num 2

--- a/src/dns.c
+++ b/src/dns.c
@@ -342,7 +342,7 @@ struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, dns_rr_type type, i
 		break;
 	}

-	/* if not resource record, reutrn null */
+	/* if not resource record, return null */
 	if (start == DNS_RR_END) {
 		return NULL;
 	}
@@ -431,7 +431,7 @@ static int _dns_rr_add_end(struct dns_packet *packet, int type, dns_type_t rtype
 		break;
 	}

-	/* add data to end of dns_packet, and set previouse rrs point to this rrs */
+	/* add data to end of dns_packet, and set previous rrs point to this rrs */
 	if (*start != DNS_RR_END) {
 		rrs_next = (struct dns_rrs *)(packet->data + *start);
 		while (rrs_next->next != DNS_RR_END) {
@@ -731,7 +731,8 @@ int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char
 	return _dns_get_RAW(rrs, domain, maxsize, ttl, cname, &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_add_A(struct dns_packet *packet, dns_rr_type type, const char *domain, int ttl,
+			  unsigned char addr[DNS_RR_A_LEN])
 {
 	return _dns_add_RAW(packet, type, DNS_T_A, domain, ttl, addr, DNS_RR_A_LEN);
 }
@@ -1693,7 +1694,8 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		unsigned char addr[DNS_RR_A_LEN];
 		ret = _dns_decode_raw(context, addr, sizeof(addr));
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode A failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode A failed, %s, len: %d:%d", domain, (int)(context->ptr - context->data),
+				 _dns_left_len(context));
 			return -1;
 		}

@@ -1707,7 +1709,8 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		char cname[DNS_MAX_CNAME_LEN];
 		ret = _dns_decode_CNAME(context, cname, DNS_MAX_CNAME_LEN);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode CNAME failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode CNAME failed, %s, len: %d:%d", domain, (int)(context->ptr - context->data),
+				 _dns_left_len(context));
 			return -1;
 		}

@@ -1721,7 +1724,7 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		struct dns_soa soa;
 		ret = _dns_decode_SOA(context, &soa);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode SOA failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode SOA failed, %s", domain);
 			return -1;
 		}

@@ -1735,7 +1738,7 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		char ns[DNS_MAX_CNAME_LEN];
 		ret = _dns_decode_CNAME(context, ns, DNS_MAX_CNAME_LEN);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode NS failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode NS failed, %s", domain);
 			return -1;
 		}

@@ -1749,7 +1752,7 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		char name[DNS_MAX_CNAME_LEN];
 		ret = _dns_decode_CNAME(context, name, DNS_MAX_CNAME_LEN);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode PTR failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode PTR failed, %s", domain);
 			return -1;
 		}

@@ -1763,7 +1766,7 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		unsigned char addr[DNS_RR_AAAA_LEN];
 		ret = _dns_decode_raw(context, addr, sizeof(addr));
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode AAAA failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode AAAA failed, %s", domain);
 			return -1;
 		}

@@ -1777,12 +1780,12 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)
 		unsigned char *opt_start = context->ptr;
 		ret = _dns_decode_opt(context, type, ttl, rr_len);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode opt failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode opt failed, %s", domain);
 			return -1;
 		}

 		if (context->ptr - opt_start != rr_len) {
-			tlog(TLOG_ERROR, "opt length mismatch, %s\n", domain);
+			tlog(TLOG_DEBUG, "opt length mismatch, %s\n", domain);
 			return -1;
 		}

@@ -1797,7 +1800,7 @@ static int _dns_decode_an(struct dns_context *context, dns_rr_type type)

 		ret = _dns_decode_raw(context, raw_data, rr_len);
 		if (ret < 0) {
-			tlog(TLOG_ERROR, "decode A failed, %s", domain);
+			tlog(TLOG_DEBUG, "decode A failed, %s", domain);
 			return -1;
 		}

@@ -2220,43 +2223,3 @@ int dns_packet_update(unsigned char *data, int size, struct dns_update_param *pa

 	return 0;
 }
-
-#if 0
-void dns_debug(void)
-{
-	unsigned char data[1024];
-	ssize_t len;
-	char buff[4096];
-
-	int fd = open("dns.bin", O_RDWR);
-	if (fd < 0) {
-		return;
-	}
-	len = read(fd, data, 1024);
-	close(fd);
-	if (len < 0) {
-		return;
-	}
-
-	struct dns_packet *packet = (struct dns_packet *)buff;
-	if (dns_decode(packet, 4096, data, len) != 0) {
-		tlog(TLOG_ERROR, "decode failed.\n");
-	}
-
-	memset(data, 0, sizeof(data));
-	len = dns_encode(data, 1024, packet);
-	if (len < 0) {
-		tlog(TLOG_ERROR, "encode failed.");
-	}
-
-	fd = open("dns-cmp.bin", O_CREAT | O_TRUNC | O_RDWR, 0660);
-	write(fd, data, len);
-	close(fd);
-
-	packet = (struct dns_packet *)buff;
-	if (dns_decode(packet, 4096, data, len) != 0) {
-		tlog(TLOG_ERROR, "decode failed.\n");
-	}
-
-}
-#endif
--- a/src/dns_cache.h
+++ b/src/dns_cache.h
@@ -31,7 +31,7 @@
 extern "C" {
 #endif

-#define DNS_CACHE_TTL_MIN 30
+#define DNS_CACHE_TTL_MIN 1
 #define DNS_CACHE_VERSION_LEN 32
 #define MAGIC_NUMBER 0x6548634163536e44
 #define MAGIC_CACHE_DATA 0x44615461
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -574,7 +574,8 @@ errout:
 	return -1;
 }

-static int _dns_client_add_to_pending_group(const char *group_name, char *server_ip, int port, dns_server_type_t server_type)
+static int _dns_client_add_to_pending_group(const char *group_name, char *server_ip, int port,
+											dns_server_type_t server_type)
 {
 	struct dns_server_pending *item = NULL;
 	struct dns_server_pending *tmp = NULL;
@@ -621,8 +622,8 @@ errout:
 }

 /* add server to group */
-static int _dns_client_add_to_group_pending(const char *group_name, char *server_ip, int port, dns_server_type_t server_type,
-											int ispending)
+static int _dns_client_add_to_group_pending(const char *group_name, char *server_ip, int port,
+											dns_server_type_t server_type, int ispending)
 {
 	struct dns_server_info *server_info = NULL;

@@ -1591,8 +1592,11 @@ static int _dns_client_recv(struct dns_server_info *server_info, unsigned char *
 	len = dns_decode(packet, DNS_PACKSIZE, inpacket, inpacket_len);
 	if (len != 0) {
 		char host_name[DNS_MAX_CNAME_LEN];
-		tlog(TLOG_WARN, "decode failed, packet len = %d, tc = %d, id = %d, from = %s\n", inpacket_len, packet->head.tc,
+		tlog(TLOG_INFO, "decode failed, packet len = %d, tc = %d, id = %d, from = %s\n", inpacket_len, packet->head.tc,
 			 packet->head.id, gethost_by_addr(host_name, sizeof(host_name), from));
+		if (dns_save_fail_packet) {
+			dns_packet_save(dns_save_fail_packet_dir, "client", host_name, inpacket, inpacket_len);
+		}
 		return -1;
 	}

@@ -1721,7 +1725,7 @@ static int _DNS_client_create_socket_tcp(struct dns_server_info *server_info)

 	fd = socket(server_info->ai_family, SOCK_STREAM, 0);
 	if (fd < 0) {
-		tlog(TLOG_ERROR, "create socket failed.");
+		tlog(TLOG_ERROR, "create socket failed, %s", strerror(errno));
 		goto errout;
 	}

@@ -1732,7 +1736,7 @@ static int _DNS_client_create_socket_tcp(struct dns_server_info *server_info)

 	/* enable tcp fast open */
 	if (setsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN_CONNECT, &yes, sizeof(yes)) != 0) {
-		tlog(TLOG_DEBUG, "enable TCP fast open failed.");
+		tlog(TLOG_DEBUG, "enable TCP fast open failed, %s", strerror(errno));
 	}

 	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
@@ -1988,6 +1992,11 @@ static int _dns_client_socket_ssl_send(struct dns_server_info *server, const voi
 		return -1;
 	}

+	if (num < 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
 	ret = _ssl_write(server, buf, num);
 	if (ret > 0) {
 		return ret;
@@ -2075,7 +2084,7 @@ static int _dns_client_socket_ssl_recv(struct dns_server_info *server, void *buf
 			return 0;
 		}

-		tlog(TLOG_ERROR, "SSL read fail error no: %s(%lx)\n", ERR_reason_error_string(ssl_err), ssl_err);
+		tlog(TLOG_INFO, "SSL read fail error no: %s(%lx), len: %d\n", ERR_reason_error_string(ssl_err), ssl_err, num);
 		errno = EFAULT;
 		ret = -1;
 		break;
--- a/src/dns_conf.c
+++ b/src/dns_conf.c
@@ -59,6 +59,14 @@ int dns_conf_tcp_idle_time = 120;

 int dns_conf_max_reply_ip_num = DNS_MAX_REPLY_IP_NUM;

+static struct config_enum_list dns_conf_response_mode_enum[] = {
+	{"first-ping", DNS_RESPONSE_MODE_FIRST_PING_IP},
+	{"fastest-ip", DNS_RESPONSE_MODE_FASTEST_IP},
+	{"fastest-response", DNS_RESPONSE_MODE_FASTEST_RESPONSE},
+	{0, 0}};
+
+enum response_mode_type dns_conf_response_mode;
+
 /* cache */
 int dns_conf_cachesize = DEFAULT_DNS_CACHE_SIZE;
 int dns_conf_prefetch = 0;
@@ -122,6 +130,9 @@ int dns_conf_ipset_timeout_enable;

 char dns_conf_user[DNS_CONF_USRNAME_LEN];

+int dns_save_fail_packet;
+char dns_save_fail_packet_dir[DNS_MAX_PATH];
+
 /* ECS */
 struct dns_edns_client_subnet dns_conf_ipv4_ecs;
 struct dns_edns_client_subnet dns_conf_ipv6_ecs;
@@ -1022,7 +1033,7 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 	bind_ip->flags = server_flag;
 	bind_ip->group = group;
 	dns_conf_bind_ip_num++;
-	tlog(TLOG_DEBUG, "bind ip %s, type:%d, flag: %X", ip, type, server_flag);
+	tlog(TLOG_DEBUG, "bind ip %s, type: %d, flag: %X", ip, type, server_flag);

 	return 0;

@@ -1897,6 +1908,7 @@ static struct config_item _config_item[] = {
 	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_ENUM("response-mode", &dns_conf_response_mode, &dns_conf_response_mode_enum),
 	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),
@@ -1911,6 +1923,8 @@ static struct config_item _config_item[] = {
 	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_YESNO("debug-save-fail-packet", &dns_save_fail_packet),
+	CONF_STRING("debug-save-fail-packet-dir", (char *)&dns_save_fail_packet_dir, sizeof(dns_save_fail_packet_dir)),
 	CONF_CUSTOM("conf-file", config_addtional_file, NULL),
 	CONF_END(),
 };
@@ -2059,6 +2073,8 @@ static int _dns_conf_load_pre(void)

 	_dns_ping_cap_check();

+	safe_strncpy(dns_save_fail_packet_dir, SMARTDNS_DEBUG_DIR, sizeof(dns_save_fail_packet_dir));
+
 	return 0;

 errout:
@@ -2069,6 +2085,12 @@ static int _dns_conf_load_post(void)
 {
 	_dns_conf_speed_check_mode_verify();

+	if (dns_conf_cachesize == 0 && dns_conf_response_mode == DNS_RESPONSE_MODE_FASTEST_RESPONSE) {
+		dns_conf_response_mode = DNS_RESPONSE_MODE_FASTEST_IP;
+		tlog(TLOG_WARN, "force set response to %s as cache size is 0",
+			 dns_conf_response_mode_enum[dns_conf_response_mode].name);
+	}
+
 	return 0;
 }

--- a/src/dns_conf.h
+++ b/src/dns_conf.h
@@ -49,9 +49,10 @@ extern "C" {
 #define DEFAULT_DNS_HTTPS_PORT 443
 #define DNS_MAX_CONF_CNAME_LEN 256
 #define SMARTDNS_CONF_FILE "/etc/smartdns/smartdns.conf"
-#define SMARTDNS_LOG_FILE "/var/log/smartdns.log"
-#define SMARTDNS_AUDIT_FILE "/var/log/smartdns-audit.log"
+#define SMARTDNS_LOG_FILE "/var/log/smartdns/smartdns.log"
+#define SMARTDNS_AUDIT_FILE "/var/log/smartdns/smartdns-audit.log"
 #define SMARTDNS_CACHE_FILE "/tmp/smartdns.cache"
+#define SMARTDNS_DEBUG_DIR "/tmp/smartdns"

 enum domain_rule {
 	DOMAIN_RULE_FLAGS = 0,
@@ -298,6 +299,12 @@ 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;
+enum response_mode_type {
+	DNS_RESPONSE_MODE_FIRST_PING_IP = 0,
+	DNS_RESPONSE_MODE_FASTEST_IP,
+	DNS_RESPONSE_MODE_FASTEST_RESPONSE,
+};
+extern enum response_mode_type dns_conf_response_mode;

 extern int dns_conf_rr_ttl;
 extern int dns_conf_rr_ttl_reply_max;
@@ -315,6 +322,9 @@ extern struct dns_edns_client_subnet dns_conf_ipv6_ecs;

 extern char dns_conf_sni_proxy_ip[DNS_MAX_IPLEN];

+extern int dns_save_fail_packet;
+extern char dns_save_fail_packet_dir[DNS_MAX_PATH];
+
 void dns_server_load_exit(void);

 int dns_server_load_conf(const char *file);
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -110,6 +110,8 @@ struct dns_server_post_context {
 	int do_ipset;
 	int do_log_result;
 	int reply_ttl;
+	int cache_ttl;
+	int no_check_add_ip;
 	int do_audit;
 	int do_force_soa;
 	int skip_notify_count;
@@ -477,6 +479,11 @@ static void _dns_server_audit_log(struct dns_server_post_context *context)
 					continue;
 				}

+				if (strncmp(name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(name, request->cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
 				const char *fmt = "%d.%d.%d.%d";
 				if (ip_num > 0) {
 					fmt = ", %d.%d.%d.%d";
@@ -492,6 +499,12 @@ static void _dns_server_audit_log(struct dns_server_post_context *context)
 				if (dns_get_AAAA(rrs, name, DNS_MAX_CNAME_LEN, &ttl, ipv6_addr) != 0) {
 					continue;
 				}
+
+				if (strncmp(name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(name, request->cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
 				const char *fmt = "%s";
 				if (ip_num > 0) {
 					fmt = ", %s";
@@ -543,8 +556,9 @@ static void _dns_server_audit_log(struct dns_server_post_context *context)
 	snprintf(req_time, sizeof(req_time), "[%.4d-%.2d-%.2d %.2d:%.2d:%.2d,%.3d]", tm.year, tm.mon, tm.mday, tm.hour,
 			 tm.min, tm.sec, tm.usec / 1000);

-	tlog_printf(dns_audit, "%s %s query %s, time %lums, type %d, result %s\n", req_time, req_host, request->domain,
-				get_tick_count() - request->send_tick, request->qtype, req_result);
+	tlog_printf(dns_audit, "%s %s query %s, type %d, time %lums, speed: %.1fms, result %s\n", req_time, req_host,
+				request->domain, request->qtype, get_tick_count() - request->send_tick,
+				((float)request->ping_time) / 10, req_result);
 }

 static void _dns_rrs_result_log(struct dns_server_post_context *context, struct dns_ip_address *addr_map)
@@ -872,7 +886,7 @@ static int _dns_server_reply_udp(struct dns_request *request, struct dns_server_
 								 unsigned char *inpacket, int inpacket_len)
 {
 	int send_len = 0;
-	if (atomic_read(&server.run) == 0) {
+	if (atomic_read(&server.run) == 0 || inpacket == NULL || inpacket_len <= 0) {
 		return -1;
 	}

@@ -909,7 +923,7 @@ static int _dns_reply_inpacket(struct dns_request *request, unsigned char *inpac
 }

 static int _dns_server_request_update_cache(struct dns_request *request, dns_type_t qtype,
-											struct dns_cache_data *cache_data, int has_soa)
+											struct dns_cache_data *cache_data, int has_soa, int cache_ttl)
 {
 	int ttl = 0;
 	int speed = 0;
@@ -918,7 +932,11 @@ static int _dns_server_request_update_cache(struct dns_request *request, dns_typ
 		goto errout;
 	}

-	ttl = _dns_server_get_conf_ttl(request->ip_ttl);
+	if (cache_ttl > 0) {
+		ttl = cache_ttl;
+	} else {
+		ttl = _dns_server_get_conf_ttl(request->ip_ttl);
+	}
 	speed = request->ping_time;

 	if (has_soa) {
@@ -926,11 +944,14 @@ static int _dns_server_request_update_cache(struct dns_request *request, dns_typ
 			ttl = _dns_server_get_conf_ttl(request->ip_ttl);
 		} else {
 			ttl = dns_conf_rr_ttl;
+			if (ttl == 0) {
+				ttl = DNS_SERVER_TMOUT_TTL;
+			}
 		}
 		dns_cache_set_data_soa(cache_data, request->server_flags, request->cname, request->ttl_cname);
 	}

-	tlog(TLOG_DEBUG, "cache %s qtype:%d ttl: %d\n", request->domain, qtype, ttl);
+	tlog(TLOG_DEBUG, "cache %s qtype: %d ttl: %d\n", request->domain, qtype, ttl);

 	/* if doing prefetch, update cache only */
 	if (request->prefetch) {
@@ -1006,6 +1027,10 @@ static int _dns_cache_cname_packet(struct dns_server_post_context *context)
 					continue;
 				}

+				if (strncmp(request->cname, name, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
 				ret = dns_add_A(cname_packet, DNS_RRS_AN, request->cname, ttl, ipv4_addr);
 				if (ret != 0) {
 					return -1;
@@ -1018,6 +1043,10 @@ static int _dns_cache_cname_packet(struct dns_server_post_context *context)
 					continue;
 				}

+				if (strncmp(request->cname, name, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
 				ret = dns_add_AAAA(cname_packet, DNS_RRS_AN, request->cname, ttl, ipv6_addr);
 				if (ret != 0) {
 					return -1;
@@ -1234,7 +1263,7 @@ static int _dns_cache_reply_packet(struct dns_server_post_context *context)
 		has_soa = 0;
 	}

-	if (_dns_server_request_update_cache(request, context->qtype, cache_packet, has_soa) != 0) {
+	if (_dns_server_request_update_cache(request, context->qtype, cache_packet, has_soa, context->cache_ttl) != 0) {
 		tlog(TLOG_WARN, "update packet cache failed.");
 	}

@@ -1937,6 +1966,7 @@ static void _dns_server_ping_result(struct ping_host_struct *ping_host, const ch
 	int may_complete = 0;
 	int threshold = 100;
 	struct dns_ip_address *addr_map = NULL;
+	int last_rtt = request->ping_time;

 	if (request == NULL) {
 		return;
@@ -1948,6 +1978,7 @@ static void _dns_server_ping_result(struct ping_host_struct *ping_host, const ch
 		return;
 	} else if (result == PING_RESULT_TIMEOUT) {
 		tlog(TLOG_DEBUG, "ping %s timeout", host);
+		goto out;
 		return;
 	} else if (result == PING_RESULT_ERROR) {
 		if (addr->sa_family != AF_INET6) {
@@ -1965,7 +1996,6 @@ static void _dns_server_ping_result(struct ping_host_struct *ping_host, const ch
 	}

 	int rtt = tv->tv_sec * 10000 + tv->tv_usec / 100;
-	int last_rtt = request->ping_time;

 	if (result == PING_RESULT_RESPONSE) {
 		tlog(TLOG_DEBUG, "from %s: seq=%d time=%d, lasttime=%d id=%d", host, seqno, rtt, last_rtt, request->id);
@@ -2058,10 +2088,18 @@ static void _dns_server_ping_result(struct ping_host_struct *ping_host, const ch
 		break;
 	}

+out:
 	/* If the ping delay is less than the threshold, the result is returned */
-	if (rtt < threshold) {
-		may_complete = 1;
-	} else if (rtt < (int)(get_tick_count() - request->send_tick) * 8) {
+	if (request->ping_time > 0) {
+		if (request->ping_time < threshold) {
+			may_complete = 1;
+		} else if (request->ping_time < (int)(get_tick_count() - request->send_tick) * 8) {
+			may_complete = 1;
+		}
+	}
+
+	/* Get first ping result */
+	if (dns_conf_response_mode == DNS_RESPONSE_MODE_FIRST_PING_IP && last_rtt == -1 && request->ping_time > 0) {
 		may_complete = 1;
 	}

@@ -2204,8 +2242,8 @@ static int _dns_server_is_adblock_ipv6(const unsigned char addr[16])
 	return -1;
 }

-static int _dns_server_process_answer_A(struct dns_rrs *rrs, struct dns_request *request, const char *domain, char *cname,
-										unsigned int result_flag)
+static int _dns_server_process_answer_A(struct dns_rrs *rrs, struct dns_request *request, const char *domain,
+										char *cname, unsigned int result_flag)
 {
 	int ttl = 0;
 	int ip_check_result = 0;
@@ -2282,8 +2320,8 @@ static int _dns_server_process_answer_A(struct dns_rrs *rrs, struct dns_request
 	return 0;
 }

-static int _dns_server_process_answer_AAAA(struct dns_rrs *rrs, struct dns_request *request, const char *domain, char *cname,
-										   unsigned int result_flag)
+static int _dns_server_process_answer_AAAA(struct dns_rrs *rrs, struct dns_request *request, const char *domain,
+										   char *cname, unsigned int result_flag)
 {
 	unsigned char addr[16];
 	char name[DNS_MAX_CNAME_LEN] = {0};
@@ -2408,10 +2446,17 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
 			case DNS_T_NS: {
 				char nsname[DNS_MAX_CNAME_LEN];
 				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, nsname, DNS_MAX_CNAME_LEN);
-				tlog(TLOG_DEBUG, "NS: %s ttl:%d nsname: %s\n", name, ttl, nsname);
+				tlog(TLOG_DEBUG, "NS: %s ttl: %d nsname: %s\n", name, ttl, nsname);
 			} break;
 			case DNS_T_CNAME: {
-				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, cname, DNS_MAX_CNAME_LEN);
+				char domain_name[DNS_MAX_CNAME_LEN] = {0};
+				char domain_cname[DNS_MAX_CNAME_LEN] = {0};
+				dns_get_CNAME(rrs, domain_name, DNS_MAX_CNAME_LEN, &ttl, domain_cname, DNS_MAX_CNAME_LEN);
+				if (strncmp(domain_name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(domain_name, cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+				safe_strncpy(cname, domain_cname, DNS_MAX_CNAME_LEN);
 				tlog(TLOG_DEBUG, "name: %s ttl: %d cname: %s\n", name, ttl, cname);
 			} break;
 			case DNS_T_SOA: {
@@ -2440,8 +2485,8 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
 	return 0;
 }

-static int _dns_server_passthrough_rule_check(struct dns_request *request, const char *domain, struct dns_packet *packet,
-											  unsigned int result_flag, int *pttl)
+static int _dns_server_passthrough_rule_check(struct dns_request *request, const char *domain,
+											  struct dns_packet *packet, unsigned int result_flag, int *pttl)
 {
 	int ttl = 0;
 	char name[DNS_MAX_CNAME_LEN] = {0};
@@ -2486,7 +2531,7 @@ static int _dns_server_passthrough_rule_check(struct dns_request *request, const
 					continue;
 				}

-				tlog(TLOG_DEBUG, "domain: %s TTL:%d IP: %d.%d.%d.%d", name, ttl_tmp, addr[0], addr[1], addr[2],
+				tlog(TLOG_DEBUG, "domain: %s TTL: %d IP: %d.%d.%d.%d", name, ttl_tmp, addr[0], addr[1], addr[2],
 					 addr[3]);

 				/* ip rule check */
@@ -2575,7 +2620,13 @@ static int _dns_server_get_answer(struct dns_server_post_context *context)

 				/* get A result */
 				dns_get_A(rrs, name, DNS_MAX_CNAME_LEN, &ttl, addr);
-				if (_dns_ip_address_check_add(request, name, addr, DNS_T_A) != 0) {
+
+				if (strncmp(name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(name, request->cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
+				if (context->no_check_add_ip == 0 && _dns_ip_address_check_add(request, name, addr, DNS_T_A) != 0) {
 					continue;
 				}

@@ -2599,7 +2650,13 @@ static int _dns_server_get_answer(struct dns_server_post_context *context)
 					continue;
 				}
 				dns_get_AAAA(rrs, name, DNS_MAX_CNAME_LEN, &ttl, addr);
-				if (_dns_ip_address_check_add(request, name, addr, DNS_T_AAAA) != 0) {
+
+				if (strncmp(name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(name, request->cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
+				if (context->no_check_add_ip == 0 && _dns_ip_address_check_add(request, name, addr, DNS_T_AAAA) != 0) {
 					continue;
 				}

@@ -2617,7 +2674,7 @@ static int _dns_server_get_answer(struct dns_server_post_context *context)
 				char cname[DNS_MAX_CNAME_LEN];
 				char name[DNS_MAX_CNAME_LEN] = {0};
 				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, cname, DNS_MAX_CNAME_LEN);
-				tlog(TLOG_DEBUG, "NS: %s ttl:%d cname: %s\n", name, ttl, cname);
+				tlog(TLOG_DEBUG, "NS: %s ttl: %d cname: %s\n", name, ttl, cname);
 			} break;
 			case DNS_T_CNAME: {
 				char cname[DNS_MAX_CNAME_LEN];
@@ -2627,7 +2684,12 @@ static int _dns_server_get_answer(struct dns_server_post_context *context)
 				}

 				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, cname, DNS_MAX_CNAME_LEN);
-				tlog(TLOG_DEBUG, "name:%s ttl: %d cname: %s\n", name, ttl, cname);
+				tlog(TLOG_DEBUG, "name: %s ttl: %d cname: %s\n", name, ttl, cname);
+				if (strncmp(name, request->domain, DNS_MAX_CNAME_LEN - 1) != 0 &&
+					strncmp(name, request->cname, DNS_MAX_CNAME_LEN - 1) != 0) {
+					continue;
+				}
+
 				safe_strncpy(request->cname, cname, DNS_MAX_CNAME_LEN);
 				request->ttl_cname = _dns_server_get_conf_ttl(ttl);
 				request->has_cname = 1;
@@ -2644,9 +2706,6 @@ static int _dns_server_get_answer(struct dns_server_post_context *context)
 					 "%d, minimum: %d",
 					 request->domain, request->qtype, request->soa.mname, request->soa.rname, request->soa.serial,
 					 request->soa.refresh, request->soa.retry, request->soa.expire, request->soa.minimum);
-				if (atomic_inc_return(&request->soa_num) >= (dns_server_num() / 2)) {
-					_dns_server_request_complete(request);
-				}
 			} break;
 			default:
 				break;
@@ -2754,10 +2813,10 @@ static int dns_server_resolve_callback(const char *domain, dns_result_type rtype
 	}

 	if (rtype == DNS_QUERY_RESULT) {
-		tlog(TLOG_DEBUG, "query result from server %s:%d, type: %d", dns_client_get_server_ip(server_info),
+		tlog(TLOG_DEBUG, "query result from server %s: %d, type: %d", dns_client_get_server_ip(server_info),
 			 dns_client_get_server_port(server_info), dns_client_get_server_type(server_info));

-		if (request->passthrough) {
+		if (request->passthrough && atomic_read(&request->notified) == 0) {
 			struct dns_server_post_context context;
 			int ttl = 0;
 			ret = _dns_server_passthrough_rule_check(request, domain, packet, result_flag, &ttl);
@@ -2778,6 +2837,33 @@ static int dns_server_resolve_callback(const char *domain, dns_result_type rtype
 			context.reply_ttl = ttl;
 			return _dns_server_reply_passthrouth(&context);
 		}
+
+		if (request->prefetch == 0 && dns_conf_response_mode == DNS_RESPONSE_MODE_FASTEST_RESPONSE &&
+			atomic_read(&request->notified) == 0) {
+			struct dns_server_post_context context;
+			int ttl = 0;
+			ret = _dns_server_passthrough_rule_check(request, domain, packet, result_flag, &ttl);
+			if (ret != 0) {
+				_dns_server_post_context_init_from(&context, request, packet, inpacket, inpacket_len);
+				context.do_cache = 1;
+				context.do_audit = 1;
+				context.do_reply = 1;
+				context.do_ipset = 1;
+				context.reply_ttl = 2;
+				context.cache_ttl = 2;
+				context.no_check_add_ip = 1;
+				_dns_server_reply_passthrouth(&context);
+				request->cname[0] = 0;
+				request->has_ip = 0;
+				request->has_cname = 0;
+				request->has_ping_result = 0;
+				request->has_soa = 0;
+				request->has_ptr = 0;
+				request->ping_time = -1;
+				request->ip_ttl = 0;
+			}
+		}
+
 		_dns_server_process_answer(request, domain, packet, result_flag);
 		return 0;
 	} else if (rtype == DNS_QUERY_ERR) {
@@ -3447,6 +3533,7 @@ static int _dns_server_process_cache_packet(struct dns_request *request, struct
 	request->ping_time = dns_cache->info.speed;

 	if (dns_decode(context.packet, context.packet_maxlen, cache_packet->data, cache_packet->head.size) != 0) {
+		tlog(TLOG_ERROR, "decode cache failed, %d, %d", context.packet_maxlen, context.inpacket_len);
 		return -1;
 	}

@@ -4073,6 +4160,9 @@ static int _dns_server_recv(struct dns_server_conn_head *conn, unsigned char *in
 	if (decode_len < 0) {
 		tlog(TLOG_DEBUG, "decode failed.\n");
 		ret = RECV_ERROR_INVALID_PACKET;
+		if (dns_save_fail_packet) {
+			dns_packet_save(dns_save_fail_packet_dir, "server", name, inpacket, inpacket_len);
+		}
 		goto errout;
 	}

@@ -4089,6 +4179,8 @@ static int _dns_server_recv(struct dns_server_conn_head *conn, unsigned char *in
 	}

 	if (_dns_server_parser_request(request, packet) != 0) {
+		tlog(TLOG_DEBUG, "parser request failed.");
+		ret = RECV_ERROR_INVALID_PACKET;
 		goto errout;
 	}

@@ -4107,7 +4199,7 @@ static int _dns_server_recv(struct dns_server_conn_head *conn, unsigned char *in
 	return ret;
 errout:
 	if (request) {
-		ret = _dns_server_forward_request(inpacket, inpacket_len);
+		_dns_server_forward_request(inpacket, inpacket_len);
 		_dns_server_request_release(request);
 	}

--- a/src/fast_ping.c
+++ b/src/fast_ping.c
@@ -673,6 +673,12 @@ static int _fast_ping_create_icmp_sock(FAST_PING_TYPE type)
 			}
 		}
 		if (fd < 0) {
+			if (errno == EACCES || errno == EAFNOSUPPORT) {
+				if (bool_print_log == 0) {
+					goto errout;
+				}
+				bool_print_log = 0;
+			}
 			tlog(TLOG_ERROR, "create icmp socket failed, %s\n", strerror(errno));
 			goto errout;
 		}
@@ -689,6 +695,12 @@ static int _fast_ping_create_icmp_sock(FAST_PING_TYPE type)
 		}

 		if (fd < 0) {
+			if (errno == EACCES || errno == EAFNOSUPPORT) {
+				if (bool_print_log == 0) {
+					goto errout;
+				}
+				bool_print_log = 0;
+			}
 			tlog(TLOG_ERROR, "create icmp socket failed, %s\n", strerror(errno));
 			goto errout;
 		}
--- a/src/include/conf.h
+++ b/src/include/conf.h
@@ -64,6 +64,16 @@ struct config_item_size {
 	size_t max;
 };

+struct config_enum_list {
+	char *name;
+	int id;
+};
+
+struct config_enum {
+	int *data;
+	struct config_enum_list *list;
+};
+
 #define CONF_INT(key, value, min_value, max_value)                                                                     \
 	{                                                                                                                  \
 		key, conf_int, &(struct config_item_int)                                                                       \
@@ -92,6 +102,15 @@ struct config_item_size {
 			.data = value, .min = min_value, .max = max_value                                                          \
 		}                                                                                                              \
 	}
+
+#define CONF_ENUM(key, value, enum)                                                                                    \
+	{                                                                                                                  \
+		key, conf_enum, &(struct config_enum)                                                                          \
+		{                                                                                                              \
+			.data = (int *)value, .list = (struct config_enum_list *)enum                                              \
+		}                                                                                                              \
+	}
+
 /*
 * func: int (*func)(void *data, int argc, char *argv[]);
 */
@@ -118,6 +137,8 @@ extern int conf_yesno(const char *item, void *data, int argc, char *argv[]);

 extern int conf_size(const char *item, void *data, int argc, char *argv[]);

+extern int conf_enum(const char *item, void *data, int argc, char *argv[]);
+
 /*
 * Example:
 *  int num = 0;
--- a/src/lib/conf.c
+++ b/src/lib/conf.c
@@ -97,7 +97,6 @@ int conf_yesno(const char *item, void *data, int argc, char *argv[])

 int conf_size(const char *item, void *data, int argc, char *argv[])
 {
-	/* read dns cache size */
 	int base = 1;
 	size_t size = 0;
 	int num = 0;
@@ -129,6 +128,31 @@ int conf_size(const char *item, void *data, int argc, char *argv[])
 	return 0;
 }

+int conf_enum(const char *item, void *data, int argc, char *argv[])
+{
+	struct config_enum *item_enum = data;
+	char *enum_name = argv[1];
+	int i = 0;
+
+	if (argc <= 0) {
+		return -1;
+	}
+
+	for (i = 0; item_enum->list[i].name != NULL; i++) {
+		if (strcmp(enum_name, item_enum->list[i].name) == 0) {
+			*(item_enum->data) = item_enum->list[i].id;
+			return 0;
+		}
+	}
+
+	printf("Not found config value '%s', valid value is:\n", enum_name);
+	for (i = 0; item_enum->list[i].name != NULL; i++) {
+		printf(" %s\n", item_enum->list[i].name);
+	}
+
+	return -1;
+}
+
 static void conf_getopt_reset(void)
 {
 	static struct option long_options[] = {{"-", 0, 0, 0}, {0, 0, 0, 0}};
--- a/src/smartdns.c
+++ b/src/smartdns.c
@@ -114,8 +114,8 @@ static int drop_root_privilege(void)
 	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);
+	unused = setuid(uid);
 	if (capset(&header, &cap) < 0) {
 		return -1;
 	}
@@ -132,7 +132,7 @@ static void _help(void)
 		"Start smartdns server.\n"
 		"  -f            run forground.\n"
 		"  -c [conf]     config file.\n"
-		"  -p [pid]      pid file path\n"
+		"  -p [pid]      pid file path, '-' means don't create pid file.\n"
 		"  -S            ignore segment fault signal.\n"
 		"  -x            verbose screen.\n"
 		"  -v            dispaly version.\n"
@@ -323,15 +323,22 @@ static int _smartdns_destroy_ssl(void)
 	return 0;
 }

-static int _smartdns_init(void)
+static const char *_smartdns_log_path(void)
 {
-	int ret = 0;
 	char *logfile = SMARTDNS_LOG_FILE;

 	if (dns_conf_log_file[0] != 0) {
 		logfile = dns_conf_log_file;
 	}

+	return logfile;
+}
+
+static int _smartdns_init(void)
+{
+	int ret = 0;
+	const char *logfile = _smartdns_log_path();
+
 	ret = tlog_init(logfile, dns_conf_log_size, dns_conf_log_num, 0, 0);
 	if (ret != 0) {
 		tlog(TLOG_ERROR, "start tlog failed.\n");
@@ -341,7 +348,7 @@ static int _smartdns_init(void)
 	tlog_setlogscreen(verbose_screen);
 	tlog_setlevel(dns_conf_log_level);

-	tlog(TLOG_NOTICE, "smartdns starting...(Copyright (C) Nick Peng <pymumu@gmail.com>, build:%s %s)", __DATE__,
+	tlog(TLOG_NOTICE, "smartdns starting...(Copyright (C) Nick Peng <pymumu@gmail.com>, build: %s %s)", __DATE__,
 		 __TIME__);

 	if (_smartdns_init_ssl() != 0) {
@@ -463,6 +470,43 @@ static void _reg_signal(void)
 	}
 }

+static int _smartdns_create_logdir(void)
+{
+	int uid = 0;
+	int gid = 0;
+	char logdir[PATH_MAX] = {0};
+	safe_strncpy(logdir, _smartdns_log_path(), PATH_MAX);
+	dirname(logdir);
+
+	if (access(logdir, F_OK) == 0) {
+		return 0;
+	}
+
+	if (mkdir(logdir, 0750) != 0) {
+		if (errno == EEXIST) {
+			return 0;
+		}
+
+		return -1;
+	}
+
+	int unused __attribute__((unused)) = 0;
+
+	if (get_uid_gid(&uid, &gid) != 0) {
+		return -1;
+	}
+
+	chown(logdir, uid, gid);
+	return 0;
+}
+
+static int _smartdns_init_pre(void)
+{
+	_smartdns_create_logdir();
+
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	int ret = 0;
@@ -480,7 +524,7 @@ int main(int argc, char *argv[])
 	sigemptyset(&empty_sigblock);
 	sigprocmask(SIG_SETMASK, &empty_sigblock, NULL);

-	while ((opt = getopt(argc, argv, "fhc:p:Svx")) != -1) {
+	while ((opt = getopt(argc, argv, "fhc:p:SvxN:")) != -1) {
 		switch (opt) {
 		case 'f':
 			is_forground = 1;
@@ -501,6 +545,10 @@ int main(int argc, char *argv[])
 			_show_version();
 			return 0;
 			break;
+#ifdef DEBUG
+		case 'N':
+			return dns_packet_debug(optarg);
+#endif
 		case 'h':
 			_help();
 			return 1;
@@ -523,7 +571,7 @@ int main(int argc, char *argv[])
 		_reg_signal();
 	}

-	if (create_pid_file(pid_file) != 0) {
+	if (strncmp(pid_file, "-", 2) != 0 && create_pid_file(pid_file) != 0) {
 		goto errout;
 	}

@@ -531,6 +579,11 @@ int main(int argc, char *argv[])
 	signal(SIGINT, _sig_exit);
 	signal(SIGTERM, _sig_exit);

+	if (_smartdns_init_pre() != 0) {
+		fprintf(stderr, "init failed.\n");
+		return 1;
+	}
+
 	drop_root_privilege();

 	ret = _smartdns_init();
--- a/src/tlog.c
+++ b/src/tlog.c
@@ -79,6 +79,7 @@ struct tlog_log {
    int zip_pid;
    int multi_log;
    int logscreen;
+    int no_write_log;
    int segment_log;
    int max_line_size;

@@ -216,7 +217,6 @@ static int _tlog_mkdir(const char *path)
        }

        if (mkdir(path_c, 0750) != 0) {
-            fprintf(stderr, "create directory %s failed, %s\n", path_c, strerror(errno));
            return -1;
        }

@@ -1130,6 +1130,10 @@ static int _tlog_write(struct tlog_log *log, const char *buff, int bufflen)
        unused = write(STDOUT_FILENO, buff, bufflen);
    }

+    if (log->no_write_log) {
+        return 0;
+    }
+
    /* if log file size exceeds threshold, start to compress */
    if (log->multi_log && log->fd > 0) {
        log->filesize = lseek(log->fd, 0, SEEK_END);
@@ -1160,7 +1164,15 @@ static int _tlog_write(struct tlog_log *log, const char *buff, int bufflen)

        char logfile[PATH_MAX * 2];
        if (_tlog_mkdir(log->logdir) != 0) {
-            fprintf(stderr, "create log dir %s failed.\n", log->logdir);
+            if (print_errmsg == 0) {
+                return -1;
+            }
+            print_errmsg = 0;
+            fprintf(stderr, "create log dir %s failed, %s\n", log->logdir, strerror(errno));
+            if (errno == EACCES && log->logscreen == 0) {
+                fprintf(stderr, "no permission to write log file, output log to console\n");
+                tlog_logscreen_only(log, 1);
+            }
            return -1;
        }
        snprintf(logfile, sizeof(logfile), "%s/%s", log->logdir, log->logname);
@@ -1574,11 +1586,26 @@ static void _tlog_log_setlogscreen(struct tlog_log *log, int enable)
    log->logscreen = (enable != 0) ? 1 : 0;
 }

+static void _tlog_log_setlogscreen_only(struct tlog_log *log, int enable)
+{
+    if (log == NULL) {
+        return;
+    }
+
+    log->logscreen = (enable != 0) ? 1 : 0;
+    log->no_write_log = (enable != 0) ? 1 : 0;
+}
+
 void tlog_setlogscreen(int enable)
 {
    _tlog_log_setlogscreen(tlog.root, enable);
 }

+void tlog_setlogscreen_only(int enable)
+{
+    _tlog_log_setlogscreen_only(tlog.root, enable);
+}
+
 int tlog_write_log(char *buff, int bufflen)
 {
    if (unlikely(tlog.root == NULL)) {
@@ -1597,6 +1624,15 @@ void tlog_logscreen(tlog_log *log, int enable)
    _tlog_log_setlogscreen(log, enable);
 }

+void tlog_logscreen_only(tlog_log *log, int enable)
+{
+    if (log == NULL) {
+        return;
+    }
+
+    _tlog_log_setlogscreen_only(log, enable);
+}
+
 int tlog_reg_output_func(tlog_log *log, tlog_output_func output)
 {
    if (log == NULL) {
@@ -1830,13 +1866,13 @@ int tlog_init(const char *logfile, int maxlogsize, int maxlogcount, int buffsize
    }
    tlog_reg_output_func(log, _tlog_root_write_log);

+    tlog.root = log;
    ret = pthread_create(&tlog.tid, &attr, _tlog_work, NULL);
    if (ret != 0) {
        fprintf(stderr, "create tlog work thread failed, %s\n", strerror(errno));
        goto errout;
    }

-    tlog.root = log;
    if (flag & TLOG_SUPPORT_FORK) {
        pthread_atfork(&tlog_fork_prepare, &tlog_fork_parent, &tlog_fork_child);
    }
@@ -1852,6 +1888,7 @@ errout:
    pthread_cond_destroy(&tlog.cond);
    pthread_mutex_destroy(&tlog.lock);
    tlog.run = 0;
+    tlog.root = NULL;

    _tlog_close(log, 1);

--- a/src/tlog.h
+++ b/src/tlog.h
@@ -104,6 +104,9 @@ extern void tlog_set_logfile(const char *logfile);
 /* enalbe log to screen */
 extern void tlog_setlogscreen(int enable);

+/* output log to screen only */
+extern void tlog_setlogscreen_only(int enable);
+
 /* enalbe early log to screen */
 extern void tlog_set_early_printf(int enable);

@@ -184,6 +187,9 @@ extern int tlog_vprintf(tlog_log *log, const char *format, va_list ap);
 /* enalbe log to screen */
 extern void tlog_logscreen(tlog_log *log, int enable);

+/* enalbe log to screen only*/
+extern void tlog_logscreen_only(tlog_log *log, int enable);
+
 /* register output callback */
 typedef int (*tlog_output_func)(struct tlog_log *log, const char *buff, int bufflen);
 extern int tlog_reg_output_func(tlog_log *log, tlog_output_func output);
--- a/src/util.c
+++ b/src/util.c
@@ -34,12 +34,13 @@
 #include <openssl/crypto.h>
 #include <openssl/ssl.h>
 #include <pthread.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
-#include <signal.h>
 #include <sys/prctl.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
@@ -79,6 +80,8 @@
 #define NETLINK_ALIGN(len) (((len) + 3) & ~(3))

 #define BUFF_SZ 1024
+#define PACKET_BUF_SIZE 8192
+#define PACKET_MAGIC 0X11040918

 struct ipset_netlink_attr {
 	unsigned short len;
@@ -641,7 +644,7 @@ unsigned char *SSL_SHA256(const unsigned char *d, size_t n, unsigned char *md)
 		md = m;
 	}

-	EVP_MD_CTX* ctx = EVP_MD_CTX_create();
+	EVP_MD_CTX *ctx = EVP_MD_CTX_create();
 	if (ctx == NULL) {
 		return NULL;
 	}
@@ -1159,7 +1162,7 @@ void bug_ext(const char *file, int line, const char *func, const char *errfmt, .

 int write_file(const char *filename, void *data, int data_len)
 {
-	int fd = open(filename, O_WRONLY|O_CREAT, 0644);
+	int fd = open(filename, O_WRONLY | O_CREAT, 0644);
 	if (fd < 0) {
 		return -1;
 	}
@@ -1178,3 +1181,277 @@ errout:

 	return -1;
 }
+
+int dns_packet_save(const char *dir, const char *type, const char *from, const void *packet, int packet_len)
+{
+	char *data = NULL;
+	int data_len = 0;
+	char filename[BUFF_SZ];
+	char time_s[BUFF_SZ];
+	int ret = -1;
+
+	struct tm *ptm;
+	struct tm tm;
+	struct timeval tmval;
+	struct stat sb;
+
+	if (stat(dir, &sb) != 0) {
+		mkdir(dir, 0750);
+	}
+
+	if (gettimeofday(&tmval, NULL) != 0) {
+		return -1;
+	}
+
+	ptm = localtime_r(&tmval.tv_sec, &tm);
+	if (ptm == NULL) {
+		return -1;
+	}
+
+	ret = snprintf(time_s, sizeof(time_s) - 1, "%.4d-%.2d-%.2d %.2d:%.2d:%.2d.%.3d", ptm->tm_year + 1900,
+				   ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec, (int)(tmval.tv_usec / 1000));
+	ret = snprintf(filename, sizeof(filename) - 1, "%s/%s-%.4d%.2d%.2d-%.2d%.2d%.2d%.1d.packet", dir, type,
+				   ptm->tm_year + 1900, ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec,
+				   (int)(tmval.tv_usec / 100000));
+
+	data = malloc(PACKET_BUF_SIZE);
+	if (data == NULL) {
+		return -1;
+	}
+
+	data_len = snprintf(data, PACKET_BUF_SIZE,
+						"type: %s\n"
+						"from: %s\n"
+						"time: %s\n"
+						"packet-len: %d\n",
+						type, from, time_s, packet_len);
+	if (data_len <= 0 || data_len >= PACKET_BUF_SIZE) {
+		goto out;
+	}
+
+	data[data_len] = 0;
+	data_len++;
+	uint32_t magic = htonl(PACKET_MAGIC);
+	memcpy(data + data_len, &magic, sizeof(magic));
+	data_len += sizeof(magic);
+	int len_in_h = htonl(packet_len);
+	memcpy(data + data_len, &len_in_h, sizeof(len_in_h));
+	data_len += 4;
+	memcpy(data + data_len, packet, packet_len);
+	data_len += packet_len;
+
+	ret = write_file(filename, data, data_len);
+	if (ret != 0) {
+		goto out;
+	}
+
+	ret = 0;
+out:
+	if (data) {
+		free(data);
+	}
+
+	return ret;
+}
+
+#ifdef DEBUG
+struct _dns_read_packet_info {
+	int data_len;
+	int message_len;
+	char *message;
+	int packet_len;
+	uint8_t *packet;
+	uint8_t data[0];
+};
+
+static struct _dns_read_packet_info *_dns_read_packet_file(const char *packet_file)
+{
+	struct _dns_read_packet_info *info = NULL;
+	int fd = 0;
+	int len = 0;
+	int message_len = 0;
+	uint8_t *ptr = NULL;
+
+	info = malloc(sizeof(struct _dns_read_packet_info) + PACKET_BUF_SIZE);
+	fd = open(packet_file, O_RDONLY);
+	if (fd < 0) {
+		printf("open file %s failed, %s\n", packet_file, strerror(errno));
+		goto errout;
+	}
+
+	len = read(fd, info->data, PACKET_BUF_SIZE);
+	if (len < 0) {
+		printf("read file %s failed, %s\n", packet_file, strerror(errno));
+		goto errout;
+	}
+
+	message_len = strnlen((char *)info->data, PACKET_BUF_SIZE);
+	if (message_len >= 512 || message_len >= len) {
+		printf("invalid packet file, bad message len\n");
+		goto errout;
+	}
+
+	info->message_len = message_len;
+	info->message = (char *)info->data;
+
+	ptr = info->data + message_len + 1;
+	uint32_t magic = 0;
+	if (ptr - (uint8_t *)info + sizeof(magic) >= (size_t)len) {
+		printf("invalid packet file, magic length is invalid.\n");
+		goto errout;
+	}
+
+	memcpy(&magic, ptr, sizeof(magic));
+	if (magic != htonl(PACKET_MAGIC)) {
+		printf("invalid packet file, bad magic\n");
+		goto errout;
+	}
+	ptr += sizeof(magic);
+
+	uint32_t packet_len = 0;
+	if (ptr - info->data + sizeof(packet_len) >= (size_t)len) {
+		printf("invalid packet file, packet length is invalid.\n");
+		goto errout;
+	}
+
+	memcpy(&packet_len, ptr, sizeof(packet_len));
+	packet_len = ntohl(packet_len);
+	ptr += sizeof(packet_len);
+	if (packet_len != (size_t)len - (ptr - info->data)) {
+		printf("invalid packet file, packet length is invalid\n");
+		goto errout;
+	}
+
+	info->packet_len = packet_len;
+	info->packet = ptr;
+
+	close(fd);
+	return info;
+errout:
+
+	if (fd > 0) {
+		close(fd);
+	}
+
+	if (info) {
+		free(info);
+	}
+
+	return NULL;
+}
+
+static int _dns_debug_display(struct dns_packet *packet)
+{
+	int i = 0;
+	int j = 0;
+	int ttl = 0;
+	struct dns_rrs *rrs = NULL;
+	int rr_count = 0;
+	char req_host[MAX_IP_LEN];
+
+	for (j = 1; j < DNS_RRS_END; j++) {
+		rrs = dns_get_rrs_start(packet, j, &rr_count);
+		printf("section: %d\n", j);
+		for (i = 0; i < rr_count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) {
+			switch (rrs->type) {
+			case DNS_T_A: {
+				unsigned char addr[4];
+				char name[DNS_MAX_CNAME_LEN] = {0};
+				/* get A result */
+				dns_get_A(rrs, name, DNS_MAX_CNAME_LEN, &ttl, addr);
+				req_host[0] = '\0';
+				inet_ntop(AF_INET, addr, req_host, sizeof(req_host));
+				printf("domain: %s A: %s TTL: %d\n", name, req_host, ttl);
+			} break;
+			case DNS_T_AAAA: {
+				unsigned char addr[16];
+				char name[DNS_MAX_CNAME_LEN] = {0};
+				dns_get_AAAA(rrs, name, DNS_MAX_CNAME_LEN, &ttl, addr);
+				req_host[0] = '\0';
+				inet_ntop(AF_INET6, addr, req_host, sizeof(req_host));
+				printf("domain: %s AAAA: %s TTL:%d\n", name, req_host, ttl);
+			} break;
+			case DNS_T_NS: {
+				char cname[DNS_MAX_CNAME_LEN];
+				char name[DNS_MAX_CNAME_LEN] = {0};
+				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, cname, DNS_MAX_CNAME_LEN);
+				printf("domain: %s TTL: %d NS: %s\n", name, ttl, cname);
+			} break;
+			case DNS_T_CNAME: {
+				char cname[DNS_MAX_CNAME_LEN];
+				char name[DNS_MAX_CNAME_LEN] = {0};
+				if (dns_conf_force_no_cname) {
+					continue;
+				}
+
+				dns_get_CNAME(rrs, name, DNS_MAX_CNAME_LEN, &ttl, cname, DNS_MAX_CNAME_LEN);
+				printf("domain: %s TTL: %d CNAME: %s\n", name, ttl, cname);
+			} break;
+			case DNS_T_SOA: {
+				char name[DNS_MAX_CNAME_LEN] = {0};
+				struct dns_soa soa;
+				dns_get_SOA(rrs, name, 128, &ttl, &soa);
+				printf("domain: %s SOA: mname: %s, rname: %s, serial: %d, refresh: %d, retry: %d, expire: "
+					   "%d, minimum: %d",
+					   name, soa.mname, soa.rname, soa.serial, soa.refresh, soa.retry, soa.expire, soa.minimum);
+			} break;
+			default:
+				break;
+			}
+		}
+		printf("\n");
+	}
+
+	return 0;
+}
+
+int dns_packet_debug(const char *packet_file)
+{
+	struct _dns_read_packet_info *info = NULL;
+	char buff[DNS_PACKSIZE];
+
+	tlog_setlogscreen_only(1);
+	tlog_setlevel(TLOG_DEBUG);
+
+	info = _dns_read_packet_file(packet_file);
+	if (info == NULL) {
+		goto errout;
+	}
+
+	const char *send_env = getenv("SMARTDNS_DEBUG_SEND");
+	if (send_env != NULL) {
+		char ip[32];
+		int port = 53;
+		if (parse_ip(send_env, ip, &port) == 0) {
+			int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+			if (sockfd > 0) {
+				struct sockaddr_in server;
+				server.sin_family = AF_INET;
+				server.sin_port = htons(port);
+				server.sin_addr.s_addr = inet_addr(ip);
+				sendto(sockfd, info->packet, info->packet_len, 0, (struct sockaddr *)&server, sizeof(server));
+				close(sockfd);
+			}
+		}
+	}
+
+	struct dns_packet *packet = (struct dns_packet *)buff;
+	if (dns_decode(packet, DNS_PACKSIZE, info->packet, info->packet_len) != 0) {
+		printf("decode failed.\n");
+		goto errout;
+	}
+
+	_dns_debug_display(packet);
+
+	free(info);
+	return 0;
+
+errout:
+	if (info) {
+		free(info);
+	}
+
+	return -1;
+}
+
+#endif
--- a/src/util.h
+++ b/src/util.h
@@ -126,6 +126,10 @@ void print_stack(void);

 int write_file(const char *filename, void *data, int data_len);

+int dns_packet_save(const char *dir, const char *type, const char *from, const void *packet, int packet_len);
+
+int dns_packet_debug(const char *packet_file);
+
 #ifdef __cplusplus
 }
 #endif /*__cplusplus */
Author	SHA1	Message	Date
Nick Peng	5a2559f064	Update readme	2022-08-06 16:24:33 +08:00
Nick Peng	3605e6ed71	smartdns: support no create pid file.	2022-08-05 22:13:26 +08:00
Nick Peng	6588c9822f	fast_ping: supress error log	2022-08-04 21:40:18 +08:00
honwen.chan	2f1d83cc2c	docker: refine Dockerfile, make cache happy.	2022-08-01 21:58:51 +08:00
Nick Peng	ac042e8bee	dns-debug: support record fail packet for debugging	2022-07-31 15:49:10 +08:00
Nick Peng	ab415f2ee9	feature: support response mode: first-ping, fastest-ip, fastest-response	2022-07-25 22:54:27 +08:00
Nick Peng	d3bbd8edd7	log: set default log path to /var/log/smartdns/ and auto create directory	2022-07-25 22:52:42 +08:00
Nick Peng	9390a49a72	dns_server: make log happy.	2022-07-21 21:45:14 +08:00
Felix Yan	798226ddb3	Correct typos in dns.c	2022-07-17 14:10:00 +08:00