Fix errno references when handling socket errors.

[tinc] / src / net_socket.c

diff --git a/src/net_socket.c b/src/net_socket.c
index 30b36a7..939aa9c 100644 (file)
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -1,7 +1,7 @@
 /*
     net_socket.c -- Handle various kinds of sockets.
     Copyright (C) 1998-2005 Ivo Timmermans,
-                  2000-2013 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2014 Guus Sliepen <guus@tinc-vpn.org>
                   2006      Scott Lamb <slamb@slamb.org>
                   2009      Florian Forster <octo@verplant.org>
 
@@ -103,7 +103,7 @@ static bool bind_to_interface(int sd) {
        status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
        if(status) {
                logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
-                               strerror(errno));
+                               sockstrerror(sockerrno));
                return false;
        }
 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
@@ -134,7 +134,7 @@ static bool bind_to_address(connection_t *c) {
                sa.in6.sin6_port = 0;
 
        if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
-               logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", strerror(errno));
+               logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", sockstrerror(sockerrno));
                return false;
        }
 
@@ -179,7 +179,7 @@ int setup_listen_socket(const sockaddr_t *sa) {
                if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
                        closesocket(nfd);
                        logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
-                                  strerror(sockerrno));
+                                  sockstrerror(sockerrno));
                        return -1;
                }
 #else
@@ -247,10 +247,10 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
        setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
 
        if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
-               logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
+               logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, sockstrerror(sockerrno));
 
        if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
-               logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
+               logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, sockstrerror(sockerrno));
 
 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
        if(sa->sa.sa_family == AF_INET6)
@@ -271,8 +271,6 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
                option = 1;
                setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
        }
-#else
-#warning No way to disable IPv4 fragmentation
 #endif
 
 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
@@ -285,8 +283,6 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
                option = 1;
                setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
        }
-#else
-#warning No way to disable IPv6 fragmentation
 #endif
 
        if (!bind_to_interface(nfd)) {
@@ -334,7 +330,7 @@ static void do_outgoing_pipe(connection_t *c, char *command) {
        int fd[2];
 
        if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
-               logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
+               logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", sockstrerror(sockerrno));
                return;
        }
 
@@ -383,13 +379,13 @@ static void handle_meta_write(connection_t *c) {
 
        ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
        if(outlen <= 0) {
-               if(!errno || errno == EPIPE) {
+               if(!sockerrno || sockerrno == EPIPE) {
                        logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
                } else if(sockwouldblock(sockerrno)) {
                        logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
                        return;
                } else {
-                       logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, strerror(errno));
+                       logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, sockstrerror(sockerrno));
                }
 
                terminate_connection(c, c->status.active);
@@ -547,6 +543,39 @@ begin:
        return true;
 }
 
+// Find edges pointing to this node, and use them to build a list of unique, known addresses.
+static struct addrinfo *get_known_addresses(node_t *n) {
+       struct addrinfo *ai = NULL;
+
+       for splay_each(edge_t, e, n->edge_tree) {
+               if(!e->reverse)
+                       continue;
+
+               bool found = false;
+               for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+                       if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
+                               found = true;
+                               break;
+                       }
+               }
+               if(found)
+                       continue;
+
+               struct addrinfo *nai = xzalloc(sizeof *nai);
+               if(ai)
+                       ai->ai_next = nai;
+               ai = nai;
+               ai->ai_family = e->reverse->address.sa.sa_family;
+               ai->ai_socktype = SOCK_STREAM;
+               ai->ai_protocol = IPPROTO_TCP;
+               ai->ai_addrlen = SALEN(e->reverse->address.sa);
+               ai->ai_addr = xmalloc(ai->ai_addrlen);
+               memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
+       }
+
+       return ai;
+}
+
 void setup_outgoing_connection(outgoing_t *outgoing) {
        timeout_del(&outgoing->ev);
 
@@ -564,8 +593,12 @@ void setup_outgoing_connection(outgoing_t *outgoing) {
        outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
 
        if(!outgoing->cfg) {
-               logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
-               return;
+               if(n)
+                       outgoing->aip = outgoing->ai = get_known_addresses(n);
+               if(!outgoing->ai) {
+                       logger(DEBUG_ALWAYS, LOG_ERR, "No address known for %s", outgoing->name);
+                       return;
+               }
        }
 
        do_outgoing_connection(outgoing);