From 8fab75241c59ba821ddd0429fad69fe4045e0313 Mon Sep 17 00:00:00 2001
From: Nick Peng <pymumu@gmail.com>
Date: Sat, 29 Apr 2023 00:21:40 +0800
Subject: [PATCH] smartdns: change pid file path from /var/run to /run

---
 Dockerfile                                |  2 +-
 Makefile                                  |  2 +-
 etc/init.d/smartdns                       |  5 ++++-
 package/openwrt/files/etc/init.d/smartdns |  6 +++++-
 package/optware/S50smartdns               |  5 ++++-
 src/smartdns.c                            | 11 +++++++++--
 6 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 831cc3b..ae06045 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,7 +32,7 @@ RUN cd /build/smartdns && \
     \
     ( cd package && tar -xvf *.tar.gz && chmod a+x smartdns/etc/init.d/smartdns ) && \
     \
-    mkdir -p /release/var/log /release/var/run && \
+    mkdir -p /release/var/log /release/run && \
     cp package/smartdns/etc /release/ -a && \
     cp package/smartdns/usr /release/ -a && \
     cd / && rm -rf /build
diff --git a/Makefile b/Makefile
index 3354baf..4d3dab0 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ DESTDIR :=
 PREFIX := /usr
 SBINDIR := $(PREFIX)/sbin
 SYSCONFDIR := /etc
-RUNSTATEDIR := /var/run
+RUNSTATEDIR := /run
 SYSTEMDSYSTEMUNITDIR := $(shell ${PKG_CONFIG} --variable=systemdsystemunitdir systemd)
 SMARTDNS_SYSTEMD = systemd/smartdns.service
 
diff --git a/etc/init.d/smartdns b/etc/init.d/smartdns
index f0f1cf7..c42221a 100644
--- a/etc/init.d/smartdns
+++ b/etc/init.d/smartdns
@@ -28,7 +28,10 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin
 
 . /etc/default/smartdns
 SMARTDNS=/usr/sbin/smartdns
-PIDFILE=/var/run/smartdns.pid
+PIDFILE=/run/smartdns.pid
+if [ ! -d "/run" ]; then
+	PIDFILE=/var/run/smartdns.pid
+fi
 
 test -x $SMARTDNS || exit 5
 
diff --git a/package/openwrt/files/etc/init.d/smartdns b/package/openwrt/files/etc/init.d/smartdns
index a2d81a1..32ee49d 100644
--- a/package/openwrt/files/etc/init.d/smartdns
+++ b/package/openwrt/files/etc/init.d/smartdns
@@ -22,7 +22,11 @@ USE_PROCD=1
 SERVICE_USE_PID=1
 SERVICE_WRITE_PID=1
 SERVICE_DAEMONIZE=1
-SERVICE_PID_FILE="/var/run/smartdns.pid"
+SERVICE_PID_FILE="/run/smartdns.pid"
+if [ ! -d "/run" ]; then
+	SERVICE_PID_FILE="/var/run/smartdns.pid"
+fi
+
 SMARTDNS_CONF_DIR="/etc/smartdns"
 SMARTDNS_CONF_DOWNLOAD_DIR="$SMARTDNS_CONF_DIR/conf.d"
 SMARTDNS_DOMAIN_LIST_DOWNLOAD_DIR="$SMARTDNS_CONF_DIR/domain-set"
diff --git a/package/optware/S50smartdns b/package/optware/S50smartdns
index b3d7274..51ed987 100644
--- a/package/optware/S50smartdns
+++ b/package/optware/S50smartdns
@@ -18,7 +18,10 @@
 SMARTDNS_BIN=/opt/usr/sbin/smartdns
 SMARTDNS_CONF=/opt/etc/smartdns/smartdns.conf
 DNSMASQ_CONF="/etc/dnsmasq.conf /var/etc/dnsmasq.conf /etc/storage/dnsmasq/dnsmasq.conf"
-SMARTDNS_PID=/var/run/smartdns.pid
+SMARTDNS_PID=/run/smartdns.pid
+if [ ! -d "/run" ]; then
+	SMARTDNS_PID=/var/run/smartdns.pid
+fi
 SMARTDNS_PORT=535
 SMARTDNS_OPT=/opt/etc/smartdns/smartdns-opt.conf
 # workmode 
diff --git a/src/smartdns.c b/src/smartdns.c
index b52efda..506ae4a 100644
--- a/src/smartdns.c
+++ b/src/smartdns.c
@@ -47,7 +47,8 @@
 #include <ucontext.h>
 
 #define MAX_KEY_LEN 64
-#define SMARTDNS_PID_FILE "/var/run/smartdns.pid"
+#define SMARTDNS_PID_FILE "/run/smartdns.pid"
+#define SMARTDNS_LEGACY_PID_FILE "/var/run/smartdns.pid"
 #define TMP_BUFF_LEN_32 32
 
 static int verbose_screen;
@@ -696,9 +697,15 @@ int main(int argc, char *argv[])
 	char pid_file[MAX_LINE_LEN];
 	int signal_ignore = 0;
 	sigset_t empty_sigblock;
+	struct stat sb;
 
 	safe_strncpy(config_file, SMARTDNS_CONF_FILE, MAX_LINE_LEN);
-	safe_strncpy(pid_file, SMARTDNS_PID_FILE, MAX_LINE_LEN);
+
+	if (stat("/run", &sb) == 0 && S_ISDIR(sb.st_mode)) {
+		safe_strncpy(pid_file, SMARTDNS_PID_FILE, MAX_LINE_LEN);
+	} else {
+		safe_strncpy(pid_file, SMARTDNS_LEGACY_PID_FILE, MAX_LINE_LEN);
+	}
 
 	/* patch for Asus router:  unblock all signal*/
 	sigemptyset(&empty_sigblock);