Fix #2536

config.json

@@ -1,12 +0,0 @@
-{
-    "server":"la.maxlv.net",
-    "server_port":1080,
-    "local_address":"0.0.0.0",
-    "local_port":1080,
-    "password":"CCCCCCCC",
-    "method":"aes-256-gcm",
-    "timeout":60,
-    "mode":"tcp_and_udp",
-    "plugin":"obfs-local",
-    "plugin_opts":"obfs=http;obfs-host=www.CCCCCCC.com"
-}

src/netutils.c

@@ -99,18 +99,18 @@ parse_local_addr(struct sockaddr_storage *storage_v4,
                 inet_pton(AF_INET, host, &addr->sin_addr);
                 addr->sin_family = AF_INET;
                 LOGI("binding to outbound IPv4 addr: %s", host);
-                return 0;
+                return AF_INET;
             } else if (ip.version == 6) {
                 memset(storage_v6, 0, sizeof(struct sockaddr_storage));
                 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)storage_v6;
                 inet_pton(AF_INET6, host, &addr->sin6_addr);
                 addr->sin6_family = AF_INET6;
                 LOGI("binding to outbound IPv6 addr: %s", host);
-                return 0;
+                return AF_INET6;
             }
         }
     }
-    return -1;
+    return 0;
 }
 
 int

src/server.c

@@ -478,10 +478,12 @@ connect_to_remote(EV_P_ struct addrinfo *res,
     if (is_bind_local_addr) {
         struct sockaddr_storage *local_addr =
             res->ai_family == AF_INET ? &local_addr_v4 : &local_addr_v6;
-        if (bind_to_addr(local_addr, sockfd) == -1) {
-            ERROR("bind_to_addr");
-            close(sockfd);
-            return NULL;
+        if (res->ai_family == local_addr->ss_family) {
+            if (bind_to_addr(local_addr, sockfd) == -1) {
+                ERROR("bind_to_addr");
+                FATAL("cannot bind socket");
+                return NULL;
+            }
         }
     }
 
@@ -1568,6 +1570,8 @@ main(int argc, char **argv)
     int server_num = 0;
     ss_addr_t server_addr[MAX_REMOTE_NUM];
     memset(server_addr, 0, sizeof(ss_addr_t) * MAX_REMOTE_NUM);
+    memset(&local_addr_v4, 0, sizeof(struct sockaddr_storage));
+    memset(&local_addr_v6, 0, sizeof(struct sockaddr_storage));
 
     static struct option long_options[] = {
         { "fast-open",       no_argument,       NULL, GETOPT_VAL_FAST_OPEN   },
@@ -1635,8 +1639,7 @@ main(int argc, char **argv)
             }
             break;
         case 'b':
-            if (parse_local_addr(&local_addr_v4, &local_addr_v6, optarg) == 0)
-                is_bind_local_addr = 1;
+            is_bind_local_addr += parse_local_addr(&local_addr_v4, &local_addr_v6, optarg);
             break;
         case 'p':
             server_port = optarg;
@@ -1760,12 +1763,13 @@ main(int argc, char **argv)
             fast_open = conf->fast_open;
         }
         if (is_bind_local_addr == 0) {
-            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr) == 0)
-                is_bind_local_addr = 1;
-            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v4) == 0)
-                is_bind_local_addr = 1;
-            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v6) == 0)
-                is_bind_local_addr = 1;
+            is_bind_local_addr += parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr);
+        }
+        if (is_bind_local_addr == 0) {
+            is_bind_local_addr += parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v4);
+        }
+        if (is_bind_local_addr == 0) {
+            is_bind_local_addr += parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v6);
         }
 #ifdef HAVE_SETRLIMIT
         if (nofile == 0) {

src/udprelay.c

@@ -377,15 +377,17 @@ create_remote_socket(int ipv6)
         }
 #ifdef MODULE_REMOTE
         if (is_bind_local_addr) {
-            if (bind_to_addr(&local_addr_v6, remote_sock) == -1) {
-                ERROR("bind_to_addr");
-                FATAL("[udp] cannot bind remote");
-                return -1;
+            if (local_addr_v6.ss_family == AF_INET6) {
+                if (bind_to_addr(&local_addr_v6, remote_sock) == -1) {
+                    ERROR("bind_to_addr");
+                    FATAL("[udp] cannot bind socket");
+                    return -1;
+                }
             }
         } else {
 #endif
         if (bind(remote_sock, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
-            FATAL("[udp] cannot bind remote");
+            FATAL("[udp] cannot bind socket");
             return -1;
         }
 #ifdef MODULE_REMOTE
@@ -405,10 +407,12 @@ create_remote_socket(int ipv6)
         }
 #ifdef MODULE_REMOTE
         if (is_bind_local_addr) {
-            if (bind_to_addr(&local_addr_v4, remote_sock) == -1) {
-                ERROR("bind_to_addr");
-                FATAL("[udp] cannot bind remote");
-                return -1;
+            if (local_addr_v4.ss_family == AF_INET) {
+                if (bind_to_addr(&local_addr_v4, remote_sock) == -1) {
+                    ERROR("bind_to_addr");
+                    FATAL("[udp] cannot bind socket");
+                    return -1;
+                }
             }
         } else {
 #endif