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/* irc-cap.c : irssi
Copyright (C) 2015 The Lemon Man
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "module.h"
#include "signals.h"
#include "misc.h"
#include "irc-cap.h"
#include "irc-servers.h"
int cap_toggle (IRC_SERVER_REC *server, char *cap, int enable)
{
if (cap == NULL || *cap == '\0')
return FALSE;
/* If the negotiation hasn't been completed yet just queue the requests */
if (!server->cap_complete) {
if (enable && !gslist_find_string(server->cap_queue, cap)) {
server->cap_queue = g_slist_prepend(server->cap_queue, g_strdup(cap));
return TRUE;
}
else if (!enable && gslist_find_string(server->cap_queue, cap)) {
server->cap_queue = gslist_remove_string(server->cap_queue, cap);
return TRUE;
}
return FALSE;
}
if (enable && !gslist_find_string(server->cap_active, cap)) {
/* Make sure the required cap is supported by the server */
if (!gslist_find_string(server->cap_supported, cap))
return FALSE;
irc_send_cmdv(server, "CAP REQ %s", cap);
return TRUE;
}
else if (!enable && gslist_find_string(server->cap_active, cap)) {
irc_send_cmdv(server, "CAP REQ -%s", cap);
return TRUE;
}
return FALSE;
}
void cap_finish_negotiation (IRC_SERVER_REC *server)
{
if (server->cap_complete)
return;
server->cap_complete = TRUE;
irc_send_cmd_now(server, "CAP END");
signal_emit("server cap end", 1, server);
}
static void cap_emit_signal (IRC_SERVER_REC *server, char *cmd, char *args)
{
char *signal_name;
signal_name = g_strdup_printf("server cap %s %s", cmd, args? args: "");
signal_emit(signal_name, 1, server);
g_free(signal_name);
}
static void event_cap (IRC_SERVER_REC *server, char *args, char *nick, char *address)
{
GSList *tmp;
GString *cmd;
char *params, *evt, *list, **caps;
int i, caps_length, disable, avail_caps;
params = event_get_params(args, 3, NULL, &evt, &list);
if (params == NULL)
return;
/* Strip the trailing whitespaces before splitting the string, some servers send responses with
* superfluous whitespaces that g_strsplit the interprets as tokens */
caps = g_strsplit(g_strchomp(list), " ", -1);
caps_length = g_strv_length(caps);
if (!g_strcmp0(evt, "LS")) {
/* Create a list of the supported caps */
for (i = 0; i < caps_length; i++)
server->cap_supported = g_slist_prepend(server->cap_supported, g_strdup(caps[i]));
/* Request the required caps, if any */
if (server->cap_queue == NULL) {
cap_finish_negotiation(server);
}
else {
cmd = g_string_new("CAP REQ :");
avail_caps = 0;
/* Check whether the cap is supported by the server */
for (tmp = server->cap_queue; tmp != NULL; tmp = tmp->next) {
if (gslist_find_string(server->cap_supported, tmp->data)) {
if (avail_caps > 0)
g_string_append_c(cmd, ' ');
g_string_append(cmd, tmp->data);
avail_caps++;
}
}
/* Clear the queue here */
gslist_free_full(server->cap_queue, (GDestroyNotify) g_free);
server->cap_queue = NULL;
/* If the server doesn't support any cap we requested close the negotiation here */
if (avail_caps > 0)
irc_send_cmd_now(server, cmd->str);
else
cap_finish_negotiation(server);
g_string_free(cmd, TRUE);
}
}
else if (!g_strcmp0(evt, "ACK")) {
int got_sasl = FALSE;
/* Emit a signal for every ack'd cap */
for (i = 0; i < caps_length; i++) {
disable = (*caps[i] == '-');
if (disable)
server->cap_active = gslist_remove_string(server->cap_active, caps[i] + 1);
else
server->cap_active = g_slist_prepend(server->cap_active, g_strdup(caps[i]));
if (!g_strcmp0(caps[i], "sasl"))
got_sasl = TRUE;
cap_emit_signal(server, "ack", caps[i]);
}
/* Hopefully the server has ack'd all the caps requested and we're ready to terminate the
* negotiation, unless sasl was requested. In this case we must not terminate the negotiation
* until the sasl handshake is over. */
if (got_sasl == FALSE)
cap_finish_negotiation(server);
}
else if (!g_strcmp0(evt, "NAK")) {
g_warning("The server answered with a NAK to our CAP request, this should not happen");
/* A NAK'd request means that a required cap can't be enabled or disabled, don't update the
* list of active caps and notify the listeners. */
for (i = 0; i < caps_length; i++)
cap_emit_signal(server, "nak", caps[i]);
}
g_strfreev(caps);
g_free(params);
}
static void event_invalid_cap (IRC_SERVER_REC *server, const char *data, const char *from)
{
/* The server didn't understand one (or more) requested caps, terminate the negotiation.
* This could be handled in a graceful way but since it shouldn't really ever happen this seems a
* good way to deal with 410 errors. */
server->cap_complete = FALSE;
irc_send_cmd_now(server, "CAP END");
}
void cap_init (void)
{
signal_add_first("event cap", (SIGNAL_FUNC) event_cap);
signal_add_first("event 410", (SIGNAL_FUNC) event_invalid_cap);
}
void cap_deinit (void)
{
signal_remove("event cap", (SIGNAL_FUNC) event_cap);
signal_remove("event 410", (SIGNAL_FUNC) event_invalid_cap);
}
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