source: protocols/jabber/jabber.c @ 830864d

/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Jabber module - Main file                                                *
*                                                                           *
*  Copyright 2006-2013 Wilmer van der Gaast <wilmer@gaast.net>              *
*                                                                           *
*  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 <glib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>

#include "ssl_client.h"
#include "xmltree.h"
#include "bitlbee.h"
#include "jabber.h"
#include "oauth.h"
#include "md5.h"

GSList *jabber_connections;

/* First enty is the default */
static const int jabber_port_list[] = {
        5222,
        5223,
        5220,
        5221,
        5224,
        5225,
        5226,
        5227,
        5228,
        5229,
        80,
        443,
        0
};

static jabber_subproto_desc_t jabber_subproto_list[] = {
        { "jabber", JSUB_NONE, NULL, NULL },
        { "gtalk", JSUB_GTALK, &oauth2_service_google, "talk.google.com" },
        { "fb", JSUB_FACEBOOK, &oauth2_service_facebook, "chat.facebook.com" },
        { "hipchat", JSUB_HIPCHAT, NULL, "chat.hipchat.com" },
        { NULL },
};

static void jabber_init(account_t *acc)
{
        set_t *s;
        char str[16];
        jabber_subproto_desc_t *subproto = acc->prpl->data;

        s = set_add(&acc->set, "activity_timeout", "600", set_eval_int, acc);

        s = set_add(&acc->set, "display_name", NULL, NULL, acc);

        if (subproto->oauth2_service) {
                s = set_add(&acc->set, "oauth", "false", set_eval_oauth, acc);
        }

        g_snprintf(str, sizeof(str), "%d", jabber_port_list[0]);
        s = set_add(&acc->set, "port", str, set_eval_int, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        s = set_add(&acc->set, "priority", "0", set_eval_priority, acc);

        s = set_add(&acc->set, "proxy", "<local>;<auto>", NULL, acc);

        s = set_add(&acc->set, "resource", "BitlBee", NULL, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        s = set_add(&acc->set, "resource_select", "activity", NULL, acc);

        s = set_add(&acc->set, "sasl", "true", set_eval_bool, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY | SET_HIDDEN_DEFAULT;

        s = set_add(&acc->set, "server", NULL, set_eval_account, acc);
        s->flags |= SET_NOSAVE | ACC_SET_OFFLINE_ONLY | SET_NULL_OK;

        s = set_add(&acc->set, "ssl", "false", set_eval_bool, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        s = set_add(&acc->set, "tls", "true", set_eval_tls, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        s = set_add(&acc->set, "tls_verify", "true", set_eval_bool, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        s = set_add(&acc->set, "user_agent", "BitlBee", NULL, acc);

        s = set_add(&acc->set, "xmlconsole", "false", set_eval_bool, acc);
        s->flags |= ACC_SET_OFFLINE_ONLY;

        acc->flags |= ACC_FLAG_AWAY_MESSAGE | ACC_FLAG_STATUS_MESSAGE |
                      ACC_FLAG_HANDLE_DOMAINS;

        if (subproto->server) {
                set_setstr(&acc->set, "server", (char *) subproto->server);
        }
}

static void jabber_generate_id_hash(struct jabber_data *jd);

static void jabber_login(account_t *acc)
{
        struct im_connection *ic = imcb_new(acc);
        struct jabber_data *jd = g_new0(struct jabber_data, 1);
        jabber_subproto_desc_t *subproto = acc->prpl->data;
        char *s;

        /* For now this is needed in the _connected() handlers if using
           GLib event handling, to make sure we're not handling events
           on dead connections. */
        jabber_connections = g_slist_prepend(jabber_connections, ic);

        jd->ic = ic;
        ic->proto_data = jd;
        jd->subproto = subproto->id;

        jabber_set_me(ic, acc->user);

        jd->fd = jd->r_inpa = jd->w_inpa = -1;

        if (jd->server == NULL) {
                imcb_error(ic, "Incomplete account name (format it like <username@jabberserver.name>)");
                imc_logout(ic, FALSE);
                return;
        }

        if ((s = strchr(jd->server, '/'))) {
                *s = 0;
                set_setstr(&acc->set, "resource", s + 1);

                /* Also remove the /resource from the original variable so we
                   won't have to do this again every time. */
                s = strchr(acc->user, '/');
                *s = 0;
        }

        jd->node_cache = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, jabber_cache_entry_free);
        jd->buddies = g_hash_table_new(g_str_hash, g_str_equal);

        if (subproto->oauth2_service && set_getbool(&acc->set, "oauth")) {
                GSList *p_in = NULL;
                const char *tok;

                jd->fd = jd->r_inpa = jd->w_inpa = -1;

                jd->oauth2_service = subproto->oauth2_service;

                oauth_params_parse(&p_in, ic->acc->pass);

                /* First see if we have a refresh token, in which case any
                   access token we *might* have has probably expired already
                   anyway. */
                if ((tok = oauth_params_get(&p_in, "refresh_token"))) {
                        sasl_oauth2_refresh(ic, tok);
                }
                /* If we don't have a refresh token, let's hope the access
                   token is still usable. */
                else if ((tok = oauth_params_get(&p_in, "access_token"))) {
                        jd->oauth2_access_token = g_strdup(tok);
                        jabber_connect(ic);
                }
                /* If we don't have any, start the OAuth process now. Don't
                   even open an XMPP connection yet. */
                else {
                        sasl_oauth2_init(ic);
                        ic->flags |= OPT_SLOW_LOGIN;
                }

                oauth_params_free(&p_in);
        } else {
                jabber_connect(ic);
        }
}

/* Separate this from jabber_login() so we can do OAuth first if necessary.
   Putting this in io.c would probably be more correct. */
void jabber_connect(struct im_connection *ic)
{
        account_t *acc = ic->acc;
        struct jabber_data *jd = ic->proto_data;
        int i;
        char *connect_to;
        struct ns_srv_reply **srvl = NULL, *srv = NULL;

        /* Figure out the hostname to connect to. */
        if (acc->server && *acc->server) {
                connect_to = acc->server;
        } else if ((srvl = srv_lookup("xmpp-client", "tcp", jd->server)) ||
                   (srvl = srv_lookup("jabber-client", "tcp", jd->server))) {
                /* Find the lowest-priority one. These usually come
                   back in random/shuffled order. Not looking at
                   weights etc for now. */
                srv = *srvl;
                for (i = 1; srvl[i]; i++) {
                        if (srvl[i]->prio < srv->prio) {
                                srv = srvl[i];
                        }
                }

                connect_to = srv->name;
        } else {
                connect_to = jd->server;
        }

        imcb_log(ic, "Connecting");

        for (i = 0; jabber_port_list[i] > 0; i++) {
                if (set_getint(&acc->set, "port") == jabber_port_list[i]) {
                        break;
                }
        }

        if (jabber_port_list[i] == 0) {
                imcb_log(ic, "Illegal port number");
                imc_logout(ic, FALSE);
                return;
        }

        /* For non-SSL connections we can try to use the port # from the SRV
           reply, but let's not do that when using SSL, SSL usually runs on
           non-standard ports... */
        if (set_getbool(&acc->set, "ssl")) {
                jd->ssl = ssl_connect(connect_to, set_getint(&acc->set, "port"), set_getbool(&acc->set,
                                                                                             "tls_verify"), jabber_connected_ssl,
                                      ic);
                jd->fd = jd->ssl ? ssl_getfd(jd->ssl) : -1;
        } else {
                jd->fd = proxy_connect(connect_to, srv ? srv->port : set_getint(&acc->set,
                                                                                "port"), jabber_connected_plain, ic);
        }
        srv_free(srvl);

        if (jd->fd == -1) {
                imcb_error(ic, "Could not connect to server");
                imc_logout(ic, TRUE);

                return;
        }

        if (set_getbool(&acc->set, "xmlconsole")) {
                jd->flags |= JFLAG_XMLCONSOLE;
                /* Shouldn't really do this at this stage already, maybe. But
                   I think this shouldn't break anything. */
                imcb_add_buddy(ic, JABBER_XMLCONSOLE_HANDLE, NULL);
        }

        jabber_generate_id_hash(jd);
}

/* This generates an unfinished md5_state_t variable. Every time we generate
   an ID, we finish the state by adding a sequence number and take the hash. */
static void jabber_generate_id_hash(struct jabber_data *jd)
{
        md5_byte_t binbuf[4];
        char *s;

        md5_init(&jd->cached_id_prefix);
        md5_append(&jd->cached_id_prefix, (unsigned char *) jd->username, strlen(jd->username));
        md5_append(&jd->cached_id_prefix, (unsigned char *) jd->server, strlen(jd->server));
        s = set_getstr(&jd->ic->acc->set, "resource");
        md5_append(&jd->cached_id_prefix, (unsigned char *) s, strlen(s));
        random_bytes(binbuf, 4);
        md5_append(&jd->cached_id_prefix, binbuf, 4);
}

static void jabber_logout(struct im_connection *ic)
{
        struct jabber_data *jd = ic->proto_data;

        while (jd->filetransfers) {
                imcb_file_canceled(ic, (( struct jabber_transfer *) jd->filetransfers->data)->ft, "Logging out");
        }

        while (jd->streamhosts) {
                jabber_streamhost_t *sh = jd->streamhosts->data;
                jd->streamhosts = g_slist_remove(jd->streamhosts, sh);
                g_free(sh->jid);
                g_free(sh->host);
                g_free(sh);
        }

        if (jd->fd >= 0) {
                jabber_end_stream(ic);
        }

        while (ic->groupchats) {
                jabber_chat_free(ic->groupchats->data);
        }

        if (jd->r_inpa >= 0) {
                b_event_remove(jd->r_inpa);
        }
        if (jd->w_inpa >= 0) {
                b_event_remove(jd->w_inpa);
        }

        if (jd->ssl) {
                ssl_disconnect(jd->ssl);
        }
        if (jd->fd >= 0) {
                closesocket(jd->fd);
        }

        if (jd->tx_len) {
                g_free(jd->txq);
        }

        if (jd->node_cache) {
                g_hash_table_destroy(jd->node_cache);
        }

        jabber_buddy_remove_all(ic);

        xt_free(jd->xt);

        md5_free(&jd->cached_id_prefix);

        g_free(jd->oauth2_access_token);
        g_free(jd->away_message);
        g_free(jd->internal_jid);
        g_free(jd->username);
        g_free(jd->me);
        g_free(jd);

        jabber_connections = g_slist_remove(jabber_connections, ic);
}

static int jabber_buddy_msg(struct im_connection *ic, char *who, char *message, int flags)
{
        struct jabber_data *jd = ic->proto_data;
        struct jabber_buddy *bud;
        struct xt_node *node;
        char *s;
        int st;

        if (g_strcasecmp(who, JABBER_XMLCONSOLE_HANDLE) == 0) {
                return jabber_write(ic, message, strlen(message));
        }

        if (g_strcasecmp(who, JABBER_OAUTH_HANDLE) == 0 &&
            !(jd->flags & OPT_LOGGED_IN) && jd->fd == -1) {
                if (sasl_oauth2_get_refresh_token(ic, message)) {
                        return 1;
                } else {
                        imcb_error(ic, "OAuth failure");
                        imc_logout(ic, TRUE);
                        return 0;
                }
        }

        if ((s = strchr(who, '=')) && jabber_chat_by_jid(ic, s + 1)) {
                bud = jabber_buddy_by_ext_jid(ic, who, 0);
        } else {
                bud = jabber_buddy_by_jid(ic, who, GET_BUDDY_BARE_OK);
        }

        node = xt_new_node("body", message, NULL);
        node = jabber_make_packet("message", "chat", bud ? bud->full_jid : who, node);

        if (bud && (jd->flags & JFLAG_WANT_TYPING) &&
            ((bud->flags & JBFLAG_DOES_XEP85) ||
             !(bud->flags & JBFLAG_PROBED_XEP85))) {
                struct xt_node *act;

                /* If the user likes typing notification and if we don't know
                   (and didn't probe before) if this resource supports XEP85,
                   include a probe in this packet now. Also, if we know this
                   buddy does support XEP85, we have to send this <active/>
                   tag to tell that the user stopped typing (well, that's what
                   we guess when s/he pressed Enter...). */
                act = xt_new_node("active", NULL, NULL);
                xt_add_attr(act, "xmlns", XMLNS_CHATSTATES);
                xt_add_child(node, act);

                /* Just make sure we do this only once. */
                bud->flags |= JBFLAG_PROBED_XEP85;
        }

        st = jabber_write_packet(ic, node);
        xt_free_node(node);

        return st;
}

static GList *jabber_away_states(struct im_connection *ic)
{
        static GList *l = NULL;
        int i;

        if (l == NULL) {
                for (i = 0; jabber_away_state_list[i].full_name; i++) {
                        l = g_list_append(l, (void *) jabber_away_state_list[i].full_name);
                }
        }

        return l;
}

static void jabber_get_info(struct im_connection *ic, char *who)
{
        struct jabber_buddy *bud;

        bud = jabber_buddy_by_jid(ic, who, GET_BUDDY_FIRST);

        while (bud) {
                imcb_log(ic, "Buddy %s (%d) information:", bud->full_jid, bud->priority);
                if (bud->away_state) {
                        imcb_log(ic, "Away state: %s", bud->away_state->full_name);
                }
                imcb_log(ic, "Status message: %s", bud->away_message ? bud->away_message : "(none)");

                bud = bud->next;
        }

        jabber_get_vcard(ic, bud ? bud->full_jid : who);
}

static void jabber_set_away(struct im_connection *ic, char *state_txt, char *message)
{
        struct jabber_data *jd = ic->proto_data;

        /* state_txt == NULL -> Not away.
           Unknown state -> fall back to the first defined away state. */
        if (state_txt == NULL) {
                jd->away_state = NULL;
        } else if ((jd->away_state = jabber_away_state_by_name(state_txt)) == NULL) {
                jd->away_state = jabber_away_state_list;
        }

        g_free(jd->away_message);
        jd->away_message = (message && *message) ? g_strdup(message) : NULL;

        presence_send_update(ic);
}

static void jabber_add_buddy(struct im_connection *ic, char *who, char *group)
{
        struct jabber_data *jd = ic->proto_data;

        if (g_strcasecmp(who, JABBER_XMLCONSOLE_HANDLE) == 0) {
                jd->flags |= JFLAG_XMLCONSOLE;
                imcb_add_buddy(ic, JABBER_XMLCONSOLE_HANDLE, NULL);
                return;
        }

        if (jabber_add_to_roster(ic, who, NULL, group)) {
                presence_send_request(ic, who, "subscribe");
        }
}

static void jabber_remove_buddy(struct im_connection *ic, char *who, char *group)
{
        struct jabber_data *jd = ic->proto_data;

        if (g_strcasecmp(who, JABBER_XMLCONSOLE_HANDLE) == 0) {
                jd->flags &= ~JFLAG_XMLCONSOLE;
                /* Not necessary for now. And for now the code isn't too
                   happy if the buddy is completely gone right after calling
                   this function already.
                imcb_remove_buddy( ic, JABBER_XMLCONSOLE_HANDLE, NULL );
                */
                return;
        }

        /* We should always do this part. Clean up our administration a little bit. */
        jabber_buddy_remove_bare(ic, who);

        if (jabber_remove_from_roster(ic, who)) {
                presence_send_request(ic, who, "unsubscribe");
        }
}

static struct groupchat *jabber_chat_join_(struct im_connection *ic, const char *room, const char *nick,
                                           const char *password, set_t **sets)
{
        struct jabber_data *jd = ic->proto_data;
        char *final_nick;

        /* Ignore the passed nick parameter if we have our own default */
        if (!(final_nick = set_getstr(sets, "nick")) &&
            !(final_nick = set_getstr(&ic->acc->set, "display_name"))) {
                /* Well, whatever, actually use the provided default, then */
                final_nick = (char *) nick;
        }

        if (strchr(room, '@') == NULL) {
                imcb_error(ic, "%s is not a valid Jabber room name. Maybe you mean %s@conference.%s?",
                           room, room, jd->server);
        } else if (jabber_chat_by_jid(ic, room)) {
                imcb_error(ic, "Already present in chat `%s'", room);
        } else {
                return jabber_chat_join(ic, room, final_nick, set_getstr(sets, "password"));
        }

        return NULL;
}

static struct groupchat *jabber_chat_with_(struct im_connection *ic, char *who)
{
        return jabber_chat_with(ic, who);
}

static void jabber_chat_msg_(struct groupchat *c, char *message, int flags)
{
        if (c && message) {
                jabber_chat_msg(c, message, flags);
        }
}

static void jabber_chat_topic_(struct groupchat *c, char *topic)
{
        if (c && topic) {
                jabber_chat_topic(c, topic);
        }
}

static void jabber_chat_leave_(struct groupchat *c)
{
        if (c) {
                jabber_chat_leave(c, NULL);
        }
}

static void jabber_chat_invite_(struct groupchat *c, char *who, char *msg)
{
        struct jabber_data *jd = c->ic->proto_data;
        struct jabber_chat *jc = c->data;
        gchar *msg_alt = NULL;

        if (msg == NULL) {
                msg_alt = g_strdup_printf("%s invited you to %s", jd->me, jc->name);
        }

        if (c && who) {
                jabber_chat_invite(c, who, msg ? msg : msg_alt);
        }

        g_free(msg_alt);
}

static void jabber_keepalive(struct im_connection *ic)
{
        /* Just any whitespace character is enough as a keepalive for XMPP sessions. */
        if (!jabber_write(ic, "\n", 1)) {
                return;
        }

        /* This runs the garbage collection every minute, which means every packet
           is in the cache for about a minute (which should be enough AFAIK). */
        jabber_cache_clean(ic);
}

static int jabber_send_typing(struct im_connection *ic, char *who, int typing)
{
        struct jabber_data *jd = ic->proto_data;
        struct jabber_buddy *bud;

        /* Enable typing notification related code from now. */
        jd->flags |= JFLAG_WANT_TYPING;

        if ((bud = jabber_buddy_by_jid(ic, who, 0)) == NULL) {
                /* Sending typing notifications to unknown buddies is
                   unsupported for now. Shouldn't be a problem, I think. */
                return 0;
        }

        if (bud->flags & JBFLAG_DOES_XEP85) {
                /* We're only allowed to send this stuff if we know the other
                   side supports it. */

                struct xt_node *node;
                char *type;
                int st;

                if (typing & OPT_TYPING) {
                        type = "composing";
                } else if (typing & OPT_THINKING) {
                        type = "paused";
                } else {
                        type = "active";
                }

                node = xt_new_node(type, NULL, NULL);
                xt_add_attr(node, "xmlns", XMLNS_CHATSTATES);
                node = jabber_make_packet("message", "chat", bud->full_jid, node);

                st = jabber_write_packet(ic, node);
                xt_free_node(node);

                return st;
        }

        return 1;
}

void jabber_chat_add_settings(account_t *acc, set_t **head)
{
        /* Meh. Stupid room passwords. Not trying to obfuscate/hide
           them from the user for now. */
        set_add(head, "password", NULL, NULL, NULL);
}

void jabber_chat_free_settings(account_t *acc, set_t **head)
{
        set_del(head, "password");
}

GList *jabber_buddy_action_list(bee_user_t *bu)
{
        static GList *ret = NULL;

        if (ret == NULL) {
                static const struct buddy_action ba[2] = {
                        { "VERSION", "Get client (version) information" },
                };

                ret = g_list_prepend(ret, (void *) ba + 0);
        }

        return ret;
}

void *jabber_buddy_action(struct bee_user *bu, const char *action, char * const args[], void *data)
{
        if (g_strcasecmp(action, "VERSION") == 0) {
                struct jabber_buddy *bud;

                if ((bud = jabber_buddy_by_ext_jid(bu->ic, bu->handle, 0)) == NULL) {
                        bud = jabber_buddy_by_jid(bu->ic, bu->handle, GET_BUDDY_FIRST);
                }
                for (; bud; bud = bud->next) {
                        jabber_iq_version_send(bu->ic, bud, data);
                }
        }

        return NULL;
}

gboolean jabber_handle_is_self(struct im_connection *ic, const char *who)
{
        struct jabber_data *jd = ic->proto_data;

        return ((g_strcasecmp(who, ic->acc->user) == 0) ||
                (jd->internal_jid &&
                 g_strcasecmp(who, jd->internal_jid) == 0));
}

void jabber_initmodule()
{
        int i;
        struct prpl funcs;

        memset(&funcs, 0, sizeof(funcs));

        funcs.mms = 0;                        /* no limit */
        funcs.login = jabber_login;
        funcs.init = jabber_init;
        funcs.logout = jabber_logout;
        funcs.buddy_msg = jabber_buddy_msg;
        funcs.away_states = jabber_away_states;
        funcs.set_away = jabber_set_away;
        funcs.get_info = jabber_get_info;
        funcs.add_buddy = jabber_add_buddy;
        funcs.remove_buddy = jabber_remove_buddy;
        funcs.chat_msg = jabber_chat_msg_;
        funcs.chat_topic = jabber_chat_topic_;
        funcs.chat_invite = jabber_chat_invite_;
        funcs.chat_leave = jabber_chat_leave_;
        funcs.chat_join = jabber_chat_join_;
        funcs.chat_with = jabber_chat_with_;
        funcs.chat_add_settings = jabber_chat_add_settings;
        funcs.chat_free_settings = jabber_chat_free_settings;
        funcs.keepalive = jabber_keepalive;
        funcs.send_typing = jabber_send_typing;
        funcs.handle_cmp = g_strcasecmp;
        funcs.handle_is_self = jabber_handle_is_self;
        funcs.transfer_request = jabber_si_transfer_request;
        funcs.buddy_action_list = jabber_buddy_action_list;
        funcs.buddy_action = jabber_buddy_action;

        for (i = 0; jabber_subproto_list[i].name; i++) {
                struct prpl *subproto = g_memdup(&funcs, sizeof(funcs));
                subproto->name = jabber_subproto_list[i].name;
                subproto->data = &jabber_subproto_list[i];
                register_protocol(subproto);
        }
}