add service ip to the configuration

dnsd.conf

@@ -6,10 +6,11 @@
 # https_proxy=<IP>:<PORT>
 
 # The default server URL is set below.
-server_url = https://dns.google.com/
+server_url = https://dns.google.com
 
-# The local service port
+# The local service ip and port
 service_port = 53
+service_ip = 127.0.0.1
 
 # EDNS ECS support default is disabled (0)
 # to enable change the following line to "enable_edns_ecs=true"

inc/dnssec.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016  Behrooz Kamary Aliabadi
+ * Copyright (C) 2016  Behrooz Kamary
 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -68,6 +68,8 @@
 #define OPT_ENABLE_EDNS         "enable_edns_ecs"
 #define OPT_DEFAULT_URL         "https://dns.google.com"
 #define OPT_SERVICE_PORT        "service_port"
+#define OPT_SERVICE_IP          "service_ip"
+#define OPT_SERVICE_IP_LEN      INET6_ADDRSTRLEN
 #define OPT_ENABLE_TRUE         "true"
 #define OPT_ENABLE_FALSE        "false"
 
@@ -91,6 +93,7 @@ struct func_options
     char      https_proxy[OPT_HTTPS_PROXY_LEN];
     char      server_url[OPT_SERVER_URL_LEN];
     char      server_ip_list[OPT_SERVER_IP_LEN];
+    char      service_ip[OPT_SERVICE_IP_LEN];
     uint16_t  server_timeout;
     uint16_t  service_port;
     uint8_t   enable_debug;

src/dnssec.c

@@ -253,7 +253,19 @@ int server()
     server_add.sin_port        = htons(options.service_port);
     server_add.sin_addr.s_addr = htonl(INADDR_ANY);
 
-    LOG_DEBUG("local port (%d)", options.service_port);
+    if (options.service_ip[0] != '\0')
+    {
+        if (inet_pton(AF_INET, options.service_ip, &(server_add.sin_addr)) == 1)
+        {
+            LOG_INFO("service ip (%s)", options.service_ip);
+        }
+        else
+        {
+            LOG_ERROR("invalid service ip (%s)", options.service_ip);
+        }
+    }
+
+    LOG_DEBUG("service port (%d)", options.service_port);
 
     sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
     if (sock < 0)
@@ -811,6 +823,11 @@ int parse_options()
     size_t  len     = 0;
     ssize_t read    = 0;
 
+    options.https_proxy[0]      = 0;
+    options.server_url[0]       = 0;
+    options.server_ip_list[0]   = 0;
+    options.service_ip[0]       = 0;
+
     fp = fopen(options.config_file, "r");
     if (fp == NULL) return EXIT_FAILURE;
 
@@ -845,6 +862,10 @@ int parse_options()
         {
             options.service_port = atoi(line + sizeof(OPT_SERVICE_PORT));
         }
+        else if (strstr(line, OPT_SERVICE_IP) != NULL)
+        {
+            strncpy(options.service_ip, line + sizeof(OPT_SERVICE_IP), OPT_SERVICE_IP_LEN);
+        }
         else if (strstr(line, OPT_ENABLE_EDNS) != NULL)
         {
             if (strcasestr(line, OPT_ENABLE_TRUE) != NULL) options.enable_edns = 1;