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fix #641

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Track the address family of the last failed connection attempt
(either immediately or during TLS handshake), then disprefer
that address family during reconnection.
This commit is contained in:
Shivaram Lingamneni 2019-12-09 22:47:59 -05:00
parent 50f8791f1e
commit 7d44964dcd
3 changed files with 15 additions and 3 deletions
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2
src/core/server-connect-rec.h
View File

@ -11,6 +11,7 @@ int proxy_port;
char *proxy_string, *proxy_string_after, *proxy_password;
unsigned short family; /* 0 = don't care, AF_INET or AF_INET6 */
unsigned short chosen_family; /* family actually chosen during name resolution */
char *tag; /* try to keep this tag when connected to server */
char *address;
int port;
@ -43,5 +44,6 @@ unsigned int unix_socket:1; /* Connect using named unix socket */
unsigned int use_tls:1; /* this connection uses TLS */
unsigned int tls_verify:1;
unsigned int no_connect:1; /* don't connect() at all, it's done by plugin */
unsigned short last_failed_family; /* #641: if we failed to connect to ipv6, try ipv4 and vice versa */
char *channels;
char *away_reason;

1
src/core/servers-reconnect.c
View File

@ -168,6 +168,7 @@ server_connect_copy_skeleton(SERVER_CONNECT_REC *src, int connect_info)
server_connect_ref(dest);
dest->type = module_get_uniq_id("SERVER CONNECT", 0);
dest->reconnection = src->reconnection;
dest->last_failed_family = src->last_failed_family;
dest->proxy = g_strdup(src->proxy);
dest->proxy_port = src->proxy_port;
dest->proxy_string = g_strdup(src->proxy_string);

15
src/core/servers.c
View File

@ -156,6 +156,7 @@ static void server_connect_callback_init(SERVER_REC *server, GIOChannel *handle)
error = net_geterror(handle);
if (error != 0) {
server->connection_lost = TRUE;
server->connrec->last_failed_family = server->connrec->chosen_family;
server_connect_failed(server, g_strerror(error));
return;
}
@ -176,6 +177,7 @@ static void server_connect_callback_init_ssl(SERVER_REC *server, GIOChannel *han
error = irssi_ssl_handshake(handle);
if (error == -1) {
server->connection_lost = TRUE;
server->connrec->last_failed_family = server->connrec->chosen_family;
server_connect_failed(server, NULL);
return;
}
@ -216,6 +218,7 @@ static void server_real_connect(SERVER_REC *server, IPADDR *ip,
return;
if (ip != NULL) {
server->connrec->chosen_family = ip->family;
own_ip = IPADDR_IS_V6(ip) ? server->connrec->own_ip6 : server->connrec->own_ip4;
port = server->connrec->proxy != NULL ?
server->connrec->proxy_port : server->connrec->port;
@ -241,9 +244,11 @@ static void server_real_connect(SERVER_REC *server, IPADDR *ip,
server->no_reconnect = TRUE;
server->connection_lost = TRUE;
server->connrec->last_failed_family = ip->family;
server_connect_failed(server, errmsg2 ? errmsg2 : errmsg);
g_free(errmsg2);
} else {
server->connrec->last_failed_family = 0;
server->handle = net_sendbuffer_create(handle, 0);
if (server->connrec->use_tls)
server_connect_callback_init_ssl(server, handle);
@ -289,11 +294,15 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
ip = iprec.ip6.family == 0 ? NULL : &iprec.ip6;
servername = iprec.host6;
} else {
/* pick the one that was found, or if both do it like
/SET resolve_prefer_ipv6 says. */
/* pick the one that was found. if both were found:
1. disprefer the last one that failed
2. prefer ipv4 over ipv6 unless resolve_prefer_ipv6 is set
*/
if (iprec.ip4.family == 0 ||
(iprec.ip6.family != 0 &&
settings_get_bool("resolve_prefer_ipv6"))) {
(server->connrec->last_failed_family == AF_INET ||
(settings_get_bool("resolve_prefer_ipv6") &&
server->connrec->last_failed_family != AF_INET6)))) {
ip = &iprec.ip6;
servername = iprec.host6;
} else {