source: protocols/jabber/jabber.c @ fcd5003

/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Jabber module - Main file                                                *
*                                                                           *
*  Copyright 2006 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 "md5.h"
#include "base64.h"

GSList *jabber_connections;

static void jabber_init( account_t *acc )
{
        set_t *s;
        
        s = set_add( &acc->set, "port", JABBER_PORT_DEFAULT, 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, "resource", "BitlBee", NULL, acc );
        s->flags |= ACC_SET_OFFLINE_ONLY;
        
        s = set_add( &acc->set, "resource_select", "priority", NULL, acc );
        
        s = set_add( &acc->set, "server", NULL, set_eval_account, acc );
        s->flags |= ACC_SET_NOSAVE | ACC_SET_OFFLINE_ONLY;
        
        s = set_add( &acc->set, "ssl", "false", set_eval_bool, acc );
        s->flags |= ACC_SET_OFFLINE_ONLY;
        
        s = set_add( &acc->set, "tls", "try", set_eval_tls, acc );
        s->flags |= ACC_SET_OFFLINE_ONLY;
        
        s = set_add( &acc->set, "xmlconsole", "false", set_eval_bool, acc );
        s->flags |= ACC_SET_OFFLINE_ONLY;
}

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 );
        struct ns_srv_reply *srv = NULL;
        char *connect_to, *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->username = g_strdup( acc->user );
        jd->server = strchr( jd->username, '@' );
        
        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;
        }
        
        /* So don't think of free()ing jd->server.. :-) */
        *jd->server = 0;
        jd->server ++;
        
        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;
        }
        
        /* This code isn't really pretty. Backwards compatibility never is... */
        s = acc->server;
        while( s )
        {
                static int had_port = 0;
                
                if( strncmp( s, "ssl", 3 ) == 0 )
                {
                        set_setstr( &acc->set, "ssl", "true" );
                        
                        /* Flush this part so that (if this was the first
                           part of the server string) acc->server gets
                           flushed. We don't want to have to do this another
                           time. :-) */
                        *s = 0;
                        s ++;
                        
                        /* Only set this if the user didn't specify a custom
                           port number already... */
                        if( !had_port )
                                set_setint( &acc->set, "port", 5223 );
                }
                else if( isdigit( *s ) )
                {
                        int i;
                        
                        /* The first character is a digit. It could be an
                           IP address though. Only accept this as a port#
                           if there are only digits. */
                        for( i = 0; isdigit( s[i] ); i ++ );
                        
                        /* If the first non-digit character is a colon or
                           the end of the string, save the port number
                           where it should be. */
                        if( s[i] == ':' || s[i] == 0 )
                        {
                                sscanf( s, "%d", &i );
                                set_setint( &acc->set, "port", i );
                                
                                /* See above. */
                                *s = 0;
                                s ++;
                        }
                        
                        had_port = 1;
                }
                
                s = strchr( s, ':' );
                if( s )
                {
                        *s = 0;
                        s ++;
                }
        }
        
        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 );
        
        /* Figure out the hostname to connect to. */
        if( acc->server && *acc->server )
                connect_to = acc->server;
        else if( ( srv = srv_lookup( "xmpp-client", "tcp", jd->server ) ) ||
                 ( srv = srv_lookup( "jabber-client", "tcp", jd->server ) ) )
                connect_to = srv->name;
        else
                connect_to = jd->server;
        
        imcb_log( ic, "Connecting" );
        
        if( set_getint( &acc->set, "port" ) < JABBER_PORT_MIN ||
            set_getint( &acc->set, "port" ) > JABBER_PORT_MAX )
        {
                imcb_log( ic, "Incorrect port number, must be in the %d-%d range",
                               JABBER_PORT_MIN, JABBER_PORT_MAX );
                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" ), 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 );
        }
        g_free( srv );
        
        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 );
}

static void jabber_generate_id_hash( struct jabber_data *jd )
{
        md5_state_t id_hash;
        md5_byte_t binbuf[16];
        char *s;
        
        md5_init( &id_hash );
        md5_append( &id_hash, (unsigned char *) jd->username, strlen( jd->username ) );
        md5_append( &id_hash, (unsigned char *) jd->server, strlen( jd->server ) );
        s = set_getstr( &jd->ic->acc->set, "resource" );
        md5_append( &id_hash, (unsigned char *) s, strlen( s ) );
        random_bytes( binbuf, 16 );
        md5_append( &id_hash, binbuf, 16 );
        md5_finish( &id_hash, binbuf );
        
        s = base64_encode( binbuf, 9 );
        jd->cached_id_prefix = g_strdup_printf( "%s%s", JABBER_CACHED_ID, s );
        g_free( s );
}

static void jabber_logout( struct im_connection *ic )
{
        struct jabber_data *jd = ic->proto_data;
        
        if( jd->fd >= 0 )
                jabber_end_stream( ic );
        
        while( ic->groupchats )
                jabber_chat_free( ic->groupchats );
        
        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 );
        
        xt_free( jd->xt );
        
        g_free( jd->cached_id_prefix );
        g_free( jd->away_message );
        g_free( jd->username );
        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( ( 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, 0 );
        
        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_data *jd = ic->proto_data;
        struct jabber_buddy *bud;
        
        if( strchr( who, '/' ) )
                bud = jabber_buddy_by_jid( ic, who, 0 );
        else
        {
                char *s = jabber_normalize( who );
                bud = g_hash_table_lookup( jd->buddies, s );
                g_free( s );
        }
        
        while( bud )
        {
                imcb_log( ic, "Buddy %s (%d) information:\nAway state: %s\nAway message: %s",
                                   bud->full_jid, bud->priority,
                                   bud->away_state ? bud->away_state->full_name : "(none)",
                                   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;
        struct jabber_away_state *state;
        
        /* Save all this info. We need it, for example, when changing the priority setting. */
        state = (void *) jabber_away_state_by_name( state_txt );
        jd->away_state = state ? state : (void *) jabber_away_state_list; /* Fall back to "Away" if necessary. */
        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 ) )
                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, char *room, char *nick, char *password )
{
        if( strchr( room, '@' ) == NULL )
                imcb_error( ic, "Invalid room name: %s", room );
        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, password );
        
        return NULL;
}

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_chat *jc = c->data;
        gchar *msg_alt = NULL;

        if( msg == NULL )
                msg_alt = g_strdup_printf( "%s invited you to %s", c->ic->acc->user, 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. */
        jabber_write( ic, "\n", 1 );
        
        /* 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_initmodule()
{
        struct prpl *ret = g_new0( struct prpl, 1 );
        
        ret->name = "jabber";
        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->keepalive = jabber_keepalive;
        ret->send_typing = jabber_send_typing;
        ret->handle_cmp = g_strcasecmp;

        register_protocol( ret );
}