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fix #641
Track the address family of the last failed connection attempt (either immediately or during TLS handshake), then disprefer that address family during reconnection.
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@ -11,6 +11,7 @@ int proxy_port;
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char *proxy_string, *proxy_string_after, *proxy_password;
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unsigned short family; /* 0 = don't care, AF_INET or AF_INET6 */
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unsigned short chosen_family; /* family actually chosen during name resolution */
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char *tag; /* try to keep this tag when connected to server */
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char *address;
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int port;
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@ -43,5 +44,6 @@ unsigned int unix_socket:1; /* Connect using named unix socket */
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unsigned int use_tls:1; /* this connection uses TLS */
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unsigned int tls_verify:1;
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unsigned int no_connect:1; /* don't connect() at all, it's done by plugin */
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unsigned short last_failed_family; /* #641: if we failed to connect to ipv6, try ipv4 and vice versa */
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char *channels;
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char *away_reason;
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@ -168,6 +168,7 @@ server_connect_copy_skeleton(SERVER_CONNECT_REC *src, int connect_info)
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server_connect_ref(dest);
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dest->type = module_get_uniq_id("SERVER CONNECT", 0);
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dest->reconnection = src->reconnection;
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dest->last_failed_family = src->last_failed_family;
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dest->proxy = g_strdup(src->proxy);
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dest->proxy_port = src->proxy_port;
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dest->proxy_string = g_strdup(src->proxy_string);
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@ -156,6 +156,7 @@ static void server_connect_callback_init(SERVER_REC *server, GIOChannel *handle)
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error = net_geterror(handle);
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if (error != 0) {
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server->connection_lost = TRUE;
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server->connrec->last_failed_family = server->connrec->chosen_family;
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server_connect_failed(server, g_strerror(error));
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return;
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}
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@ -176,6 +177,7 @@ static void server_connect_callback_init_ssl(SERVER_REC *server, GIOChannel *han
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error = irssi_ssl_handshake(handle);
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if (error == -1) {
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server->connection_lost = TRUE;
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server->connrec->last_failed_family = server->connrec->chosen_family;
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server_connect_failed(server, NULL);
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return;
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}
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@ -216,6 +218,7 @@ static void server_real_connect(SERVER_REC *server, IPADDR *ip,
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return;
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if (ip != NULL) {
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server->connrec->chosen_family = ip->family;
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own_ip = IPADDR_IS_V6(ip) ? server->connrec->own_ip6 : server->connrec->own_ip4;
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port = server->connrec->proxy != NULL ?
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server->connrec->proxy_port : server->connrec->port;
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@ -241,9 +244,11 @@ static void server_real_connect(SERVER_REC *server, IPADDR *ip,
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server->no_reconnect = TRUE;
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server->connection_lost = TRUE;
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server->connrec->last_failed_family = ip->family;
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server_connect_failed(server, errmsg2 ? errmsg2 : errmsg);
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g_free(errmsg2);
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} else {
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server->connrec->last_failed_family = 0;
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server->handle = net_sendbuffer_create(handle, 0);
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if (server->connrec->use_tls)
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server_connect_callback_init_ssl(server, handle);
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@ -289,11 +294,15 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
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ip = iprec.ip6.family == 0 ? NULL : &iprec.ip6;
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servername = iprec.host6;
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} else {
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/* pick the one that was found, or if both do it like
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/SET resolve_prefer_ipv6 says. */
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/* pick the one that was found. if both were found:
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1. disprefer the last one that failed
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2. prefer ipv4 over ipv6 unless resolve_prefer_ipv6 is set
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*/
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if (iprec.ip4.family == 0 ||
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(iprec.ip6.family != 0 &&
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settings_get_bool("resolve_prefer_ipv6"))) {
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(server->connrec->last_failed_family == AF_INET ||
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(settings_get_bool("resolve_prefer_ipv6") &&
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server->connrec->last_failed_family != AF_INET6)))) {
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ip = &iprec.ip6;
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servername = iprec.host6;
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} else {
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