Add try to use /etc/shadowsocks/config.json for ss-redir ss-server ss-tunnel.

src/redir.c

@@ -47,6 +47,7 @@
 
 #include "netutils.h"
 #include "utils.h"
+#include "common.h"
 #include "redir.h"
 
 #ifndef EAGAIN
@@ -653,7 +654,13 @@ int main(int argc, char **argv)
         usage();
         exit(EXIT_FAILURE);
     }
-
+    
+    if(argc == 1) {
+        if(conf_path == NULL) {
+			conf_path = DEFAULT_CONF_PATH;
+        }
+    }
+    
     if (conf_path != NULL) {
         jconf_t *conf = read_jconf(conf_path);
         if (remote_num == 0) {

src/server.c

@@ -1154,7 +1154,13 @@ int main(int argc, char **argv)
         usage();
         exit(EXIT_FAILURE);
     }
-
+    
+    if(argc == 1) {
+        if(conf_path == NULL) {
+			conf_path = DEFAULT_CONF_PATH;
+        }
+    }
+    
     if (conf_path != NULL) {
         jconf_t *conf = read_jconf(conf_path);
         if (server_num == 0) {

src/tunnel.c

@@ -709,7 +709,13 @@ int main(int argc, char **argv)
         usage();
         exit(EXIT_FAILURE);
     }
-
+    
+    if(argc == 1) {
+        if(conf_path == NULL) {
+			conf_path = DEFAULT_CONF_PATH;
+        }
+    }
+    
     if (conf_path != NULL) {
         jconf_t *conf = read_jconf(conf_path);
         if (remote_num == 0) {