source: protocols/jabber/jabber.c @ e2472dd

/***************************************************************************\
*                                                                           *
*  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 void jabber_init( account_t *acc )
{
        set_t *s;
        char str[16];
        
        s = set_add( &acc->set, "activity_timeout", "600", set_eval_int, acc );
        
        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;
}

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 );
        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;
        
        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( set_getbool( &acc->set, "oauth" ) )
        {
                GSList *p_in = NULL;
                const char *tok;
                
                jd->fd = jd->r_inpa = jd->w_inpa = -1;
                
                if( strstr( jd->server, ".facebook.com" ) )
                        jd->oauth2_service = &oauth2_service_facebook;
                else
                        jd->oauth2_service = &oauth2_service_google;
                
                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 );
        
        g_free( jd->oauth2_access_token );
        g_free( jd->away_message );
        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;
        
        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, 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;
}

void jabber_initmodule()
{
        struct prpl *ret = g_new0( struct prpl, 1 );
        
        ret->name = "jabber";
        ret->mms = 0;                        /* no limit */
        ret->login = jabber_login;
        ret->init = jabber_init;
        ret->logout = jabber_logout;
        ret->buddy_msg = jabber_buddy_msg;
        ret->away_states = jabber_away_states;
        ret->set_away = jabber_set_away;
//      ret->set_info = jabber_set_info;
        ret->get_info = jabber_get_info;
        ret->add_buddy = jabber_add_buddy;
        ret->remove_buddy = jabber_remove_buddy;
        ret->chat_msg = jabber_chat_msg_;
        ret->chat_topic = jabber_chat_topic_;
        ret->chat_invite = jabber_chat_invite_;
        ret->chat_leave = jabber_chat_leave_;
        ret->chat_join = jabber_chat_join_;
        ret->chat_with = jabber_chat_with_;
        ret->chat_add_settings = jabber_chat_add_settings;
        ret->chat_free_settings = jabber_chat_free_settings;
        ret->keepalive = jabber_keepalive;
        ret->send_typing = jabber_send_typing;
        ret->handle_cmp = g_strcasecmp;
        ret->transfer_request = jabber_si_transfer_request;
        ret->buddy_action_list = jabber_buddy_action_list;
        ret->buddy_action = jabber_buddy_action;

        register_protocol( ret );
}