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/*
netsplit.c : irssi
Copyright (C) 1999 Timo Sirainen
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "modules.h"
#include "signals.h"
#include "commands.h"
#include "misc.h"
#include "irc-server.h"
#include "netsplit.h"
/* How long to keep netsplits in memory (seconds) */
#define NETSPLIT_MAX_REMEMBER (60*30)
static int split_tag;
static NETSPLIT_SERVER_REC *netsplit_server_find(IRC_SERVER_REC *server, const char *servername, const char *destserver)
{
GSList *tmp;
for (tmp = server->split_servers; tmp != NULL; tmp = tmp->next) {
NETSPLIT_SERVER_REC *rec = tmp->data;
if (g_strcasecmp(rec->server, servername) == 0 &&
g_strcasecmp(rec->destserver, destserver) == 0)
return rec;
}
return NULL;
}
static NETSPLIT_SERVER_REC *netsplit_server_create(IRC_SERVER_REC *server, const char *servername, const char *destserver)
{
NETSPLIT_SERVER_REC *rec;
rec = netsplit_server_find(server, servername, destserver);
if (rec != NULL) {
rec->last = time(NULL);
return rec;
}
rec = g_new0(NETSPLIT_SERVER_REC, 1);
rec->last = time(NULL);
rec->server = g_strdup(servername);
rec->destserver = g_strdup(destserver);
server->split_servers = g_slist_append(server->split_servers, rec);
signal_emit("netsplit new server", 2, server, rec);
return rec;
}
static void netsplit_destroy_server(IRC_SERVER_REC *server, NETSPLIT_SERVER_REC *rec)
{
server->split_servers = g_slist_remove(server->split_servers, rec);
g_free(rec->server);
g_free(rec->destserver);
g_free(rec);
}
static NETSPLIT_REC *netsplit_add(IRC_SERVER_REC *server, const char *nick, const char *address, const char *servers)
{
NETSPLIT_REC *rec;
NETSPLIT_CHAN_REC *splitchan;
NICK_REC *nickrec;
GSList *tmp;
char *p, *dupservers;
g_return_val_if_fail(server != NULL, NULL);
g_return_val_if_fail(nick != NULL, NULL);
g_return_val_if_fail(address != NULL, NULL);
/* get splitted servers */
dupservers = g_strdup(servers);
p = strchr(dupservers, ' ');
if (p == NULL) {
g_free(dupservers);
g_return_val_if_fail(p != NULL, NULL);
}
*p++ = '\0';
rec = g_new0(NETSPLIT_REC, 1);
rec->nick = g_strdup(nick);
rec->address = g_strdup(address);
rec->destroy = time(NULL)+NETSPLIT_MAX_REMEMBER;
rec->server = netsplit_server_create(server, dupservers, p);
rec->server->count++;
g_free(dupservers);
/* copy the channel nick records.. */
for (tmp = server->channels; tmp != NULL; tmp = tmp->next) {
CHANNEL_REC *channel = tmp->data;
nickrec = nicklist_find(channel, nick);
if (nickrec == NULL)
continue;
splitchan = g_new0(NETSPLIT_CHAN_REC, 1);
splitchan->name = g_strdup(channel->name);
memcpy(&splitchan->nick, nickrec, sizeof(NICK_REC));
rec->channels = g_slist_append(rec->channels, splitchan);
}
g_hash_table_insert(server->splits, rec->nick, rec);
signal_emit("netsplit add", 1, rec);
return rec;
}
static void netsplit_destroy(IRC_SERVER_REC *server, NETSPLIT_REC *rec)
{
GSList *tmp;
g_return_if_fail(rec != NULL);
signal_emit("netsplit remove", 1, rec);
for (tmp = rec->channels; tmp != NULL; tmp = tmp->next) {
NETSPLIT_CHAN_REC *rec = tmp->data;
g_free(rec->name);
g_free(rec);
}
if (--rec->server->count == 0)
netsplit_destroy_server(server, rec->server);
g_free(rec->nick);
g_free(rec->address);
g_free(rec);
}
static void netsplit_destroy_hash(void *key, NETSPLIT_REC *rec, IRC_SERVER_REC *server)
{
netsplit_destroy(server, rec);
}
NETSPLIT_REC *netsplit_find(IRC_SERVER_REC *server, const char *nick, const char *address)
{
NETSPLIT_REC *rec;
g_return_val_if_fail(server != NULL, NULL);
g_return_val_if_fail(nick != NULL, NULL);
rec = g_hash_table_lookup(server->splits, nick);
if (rec == NULL) return NULL;
return (address == NULL || g_strcasecmp(rec->address, address) == 0) ? rec : NULL;
}
NICK_REC *netsplit_find_channel(IRC_SERVER_REC *server, const char *nick, const char *address, const char *channel)
{
NETSPLIT_REC *rec;
GSList *tmp;
rec = netsplit_find(server, nick, address);
if (rec == NULL) return NULL;
for (tmp = rec->channels; tmp != NULL; tmp = tmp->next) {
NETSPLIT_CHAN_REC *rec = tmp->data;
if (g_strcasecmp(rec->name, channel) == 0)
return &rec->nick;
}
return NULL;
}
/* check if quit message is a netsplit message - there's some paranoia
checks which are probably a bit useless since nowadays IRC servers
add space after quit message if it looks like a netsplit message. */
int quitmsg_is_split(const char *msg)
{
char *host1, *host2, *p;
int ok;
g_return_val_if_fail(msg != NULL, FALSE);
/* must have only two words */
p = strchr(msg, ' ');
if (p == NULL || p == msg || strchr(p+1, ' ') != NULL) return FALSE;
/* check that it looks ok.. */
if (!match_wildcards("*.* *.*", msg) ||
match_wildcards("*..*", msg) || strstr(msg, "))") != NULL)
return FALSE;
/* get the two hosts */
host1 = g_strndup(msg, (int) (p-msg));
host2 = p;
ok = FALSE;
if (g_strcasecmp(host1, host2) != 0) { /* hosts can't be same.. */
/* check that domain length is 2 or 3 */
p = strrchr(host1, '.');
if (p != NULL && (strlen(p+1) == 2 || strlen(p+1) == 3)) {
p = strrchr(host2, '.');
if (p != NULL && (strlen(p+1) == 2 || strlen(p+1) == 3)) {
/* it looks just like a netsplit to me. */
ok = TRUE;
}
}
}
g_free(host1);
return ok;
}
static void split_set_timeout(void *key, NETSPLIT_REC *rec, NETSPLIT_REC *orig)
{
if (rec == orig) {
/* original nick, destroy it in a few seconds.. */
rec->destroy = time(NULL)+4;
} else if (g_strcasecmp(rec->server->server, orig->server->server) == 0 &&
g_strcasecmp(rec->server->destserver, orig->server->destserver) == 0) {
/* same servers -> split over -> destroy old records sooner.. */
rec->destroy = time(NULL)+60;
}
}
static void event_join(const char *data, IRC_SERVER_REC *server, const char *nick, const char *address)
{
NETSPLIT_REC *rec;
/* check if split is over */
rec = g_hash_table_lookup(server->splits, nick);
if (rec != NULL && g_strcasecmp(rec->address, address) == 0) {
/* yep, looks like it is. for same people that had the same
splitted servers set the timeout to one minute.
.. if the user just changed server, he/she can't use the
same nick (unless the server is broken) so don't bother
checking that the nick's server matches the split. */
g_hash_table_foreach(server->splits, (GHFunc) split_set_timeout, rec);
}
}
/* remove the nick from netsplit, but do it last so that other "event join"
signal handlers can check if the join was a netjoin */
static void event_join_last(const char *data, IRC_SERVER_REC *server, const char *nick, const char *address)
{
NETSPLIT_REC *rec;
rec = g_hash_table_lookup(server->splits, nick);
if (rec != NULL) {
g_hash_table_remove(server->splits, rec->nick);
netsplit_destroy(server, rec);
}
}
static void event_quit(const char *data, IRC_SERVER_REC *server, const char *nick, const char *address)
{
g_return_if_fail(data != NULL);
if (*data == ':') data++;
if (g_strcasecmp(nick, server->nick) != 0 && quitmsg_is_split(data)) {
/* netsplit! */
netsplit_add(server, nick, address, data);
}
}
static void sig_disconnected(IRC_SERVER_REC *server)
{
g_return_if_fail(server != NULL);
if (!irc_server_check(server))
return;
g_hash_table_foreach(server->splits, (GHFunc) netsplit_destroy_hash, server);
g_hash_table_destroy(server->splits);
}
static int split_server_check(void *key, NETSPLIT_REC *rec, IRC_SERVER_REC *server)
{
/* Check if this split record is too old.. */
if (rec->destroy > time(NULL))
return FALSE;
netsplit_destroy(server, rec);
return TRUE;
}
static int split_check_old(void)
{
GSList *tmp;
for (tmp = servers; tmp != NULL; tmp = tmp->next) {
IRC_SERVER_REC *server = tmp->data;
if (irc_server_check(server))
g_hash_table_foreach_remove(server->splits, (GHRFunc) split_server_check, server);
}
return 1;
}
void netsplit_init(void)
{
split_tag = g_timeout_add(1000, (GSourceFunc) split_check_old, NULL);
signal_add_first("event join", (SIGNAL_FUNC) event_join);
signal_add_last("event join", (SIGNAL_FUNC) event_join_last);
signal_add_first("event quit", (SIGNAL_FUNC) event_quit);
signal_add("server disconnected", (SIGNAL_FUNC) sig_disconnected);
}
void netsplit_deinit(void)
{
GSList *tmp;
for (tmp = servers; tmp != NULL; tmp = tmp->next)
sig_disconnected(tmp->data);
g_source_remove(split_tag);
signal_remove("event join", (SIGNAL_FUNC) event_join);
signal_remove("event join", (SIGNAL_FUNC) event_join_last);
signal_remove("event quit", (SIGNAL_FUNC) event_quit);
signal_remove("server disconnected", (SIGNAL_FUNC) sig_disconnected);
}
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