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/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2013 Wilmer van der Gaast and others *
\********************************************************************/
/* IRCv3 CAP command
*
* Specs:
* - v3.1: http://ircv3.net/specs/core/capability-negotiation-3.1.html
* - v3.2: http://ircv3.net/specs/core/capability-negotiation-3.2.html
*
* */
/*
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 with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "bitlbee.h"
typedef struct {
char *name;
irc_cap_flag_t flag;
} cap_info_t;
static const cap_info_t supported_caps[] = {
{"sasl", CAP_SASL},
{"multi-prefix", CAP_MULTI_PREFIX},
{NULL},
};
static irc_cap_flag_t cap_flag_from_string(char *cap_name)
{
int i;
if (!cap_name || !cap_name[0]) {
return 0;
}
if (cap_name[0] == '-') {
cap_name++;
}
for (i = 0; supported_caps[i].name; i++) {
if (strcmp(supported_caps[i].name, cap_name) == 0) {
return supported_caps[i].flag;
}
}
return 0;
}
static gboolean irc_cmd_cap_req(irc_t *irc, char *caps)
{
int i;
char *lower = NULL;
char **split = NULL;
irc_cap_flag_t new_caps = irc->caps;
if (!caps || !caps[0]) {
return FALSE;
}
lower = g_ascii_strdown(caps, -1);
split = g_strsplit(lower, " ", -1);
g_free(lower);
for (i = 0; split[i]; i++) {
gboolean remove;
irc_cap_flag_t flag;
if (!split[i][0]) {
continue; /* skip empty items (consecutive spaces) */
}
remove = (split[i][0] == '-');
flag = cap_flag_from_string(split[i]);
if (!flag || (remove && !(irc->caps & flag))) {
/* unsupported cap, or removing something that isn't there */
g_strfreev(split);
return FALSE;
}
if (remove) {
new_caps &= ~flag;
} else {
new_caps |= flag;
}
}
/* if we got here, set the new caps and ack */
irc->caps = new_caps;
g_strfreev(split);
return TRUE;
}
/* version can be "302" or NULL, but we don't need cap-3.2 for anything yet */
static void irc_cmd_cap_ls(irc_t *irc, char *version)
{
int i;
GString *str = g_string_sized_new(256);
for (i = 0; supported_caps[i].name; i++) {
if (i != 0) {
g_string_append_c(str, ' ');
}
g_string_append(str, supported_caps[i].name);
}
irc_send_cap(irc, "LS", str->str);
g_string_free(str, TRUE);
}
/* this one looks suspiciously similar to cap ls,
* but cap-3.2 will make them very different */
static void irc_cmd_cap_list(irc_t *irc)
{
int i;
gboolean first = TRUE;
GString *str = g_string_sized_new(256);
for (i = 0; supported_caps[i].name; i++) {
if (irc->caps & supported_caps[i].flag) {
if (!first) {
g_string_append_c(str, ' ');
}
first = FALSE;
g_string_append(str, supported_caps[i].name);
}
}
irc_send_cap(irc, "LIST", str->str);
g_string_free(str, TRUE);
}
void irc_cmd_cap(irc_t *irc, char **cmd)
{
if (!(irc->status & USTATUS_LOGGED_IN)) {
/* Put registration on hold until CAP END */
irc->status |= USTATUS_CAP_PENDING;
}
if (g_strcasecmp(cmd[1], "LS") == 0) {
irc_cmd_cap_ls(irc, cmd[2]);
} else if (g_strcasecmp(cmd[1], "LIST") == 0) {
irc_cmd_cap_list(irc);
} else if (g_strcasecmp(cmd[1], "REQ") == 0) {
gboolean ack = irc_cmd_cap_req(irc, cmd[2]);
irc_send_cap(irc, ack ? "ACK" : "NAK", cmd[2] ? : "");
} else if (g_strcasecmp(cmd[1], "END") == 0) {
irc->status &= ~USTATUS_CAP_PENDING;
if (irc->status & USTATUS_SASL_PLAIN_PENDING) {
irc_send_num(irc, 906, ":SASL authentication aborted");
irc->status &= ~USTATUS_SASL_PLAIN_PENDING;
}
irc_check_login(irc);
} else {
irc_send_num(irc, 410, "%s :Invalid CAP command", cmd[1]);
}
}
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