diff options
Diffstat (limited to 'protocols/jabber/si.c')
| -rw-r--r-- | protocols/jabber/si.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/protocols/jabber/si.c b/protocols/jabber/si.c new file mode 100644 index 00000000..454d56b9 --- /dev/null +++ b/protocols/jabber/si.c @@ -0,0 +1,529 @@ +/***************************************************************************\ +* * +* BitlBee - An IRC to IM gateway * +* Jabber module - SI packets * +* * +* Copyright 2007 Uli Meis <a.sporto+bee@gmail.com> * +* * +* 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 "jabber.h" +#include "sha1.h" + +void jabber_si_answer_request( file_transfer_t *ft ); +int jabber_si_send_request(struct im_connection *ic, char *who, struct jabber_transfer *tf ); + +/* file_transfer free() callback */ +void jabber_si_free_transfer( file_transfer_t *ft) +{ + struct jabber_transfer *tf = ft->data; + struct jabber_data *jd = tf->ic->proto_data; + + if ( tf->watch_in ) + b_event_remove( tf->watch_in ); + + jd->filetransfers = g_slist_remove( jd->filetransfers, tf ); + + if( tf->fd != -1 ) + { + closesocket( tf->fd ); + tf->fd = -1; + } + + if( tf->disco_timeout ) + b_event_remove( tf->disco_timeout ); + + g_free( tf->ini_jid ); + g_free( tf->tgt_jid ); + g_free( tf->iq_id ); + g_free( tf->sid ); + g_free( tf ); +} + +/* file_transfer canceled() callback */ +void jabber_si_canceled( file_transfer_t *ft, char *reason ) +{ + struct jabber_transfer *tf = ft->data; + struct xt_node *reply, *iqnode; + + if( tf->accepted ) + return; + + iqnode = jabber_make_packet( "iq", "error", tf->ini_jid, NULL ); + xt_add_attr( iqnode, "id", tf->iq_id ); + reply = jabber_make_error_packet( iqnode, "forbidden", "cancel", "403" ); + xt_free_node( iqnode ); + + if( !jabber_write_packet( tf->ic, reply ) ) + imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" ); + xt_free_node( reply ); + +} + +int jabber_si_check_features( struct jabber_transfer *tf, GSList *features ) { + int foundft = FALSE, foundbt = FALSE, foundsi = FALSE; + + while ( features ) + { + if( !strcmp( features->data, XMLNS_FILETRANSFER ) ) + foundft = TRUE; + if( !strcmp( features->data, XMLNS_BYTESTREAMS ) ) + foundbt = TRUE; + if( !strcmp( features->data, XMLNS_SI ) ) + foundsi = TRUE; + + features = g_slist_next(features); + } + + if( !foundft ) + imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature file transfers" ); + else if( !foundbt ) + imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature byte streams (required)" ); + else if( !foundsi ) + imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature stream initiation (required)" ); + + return foundft && foundbt && foundsi; +} + +void jabber_si_transfer_start( struct jabber_transfer *tf ) { + + if( !jabber_si_check_features( tf, tf->bud->features ) ) + return; + + /* send the request to our buddy */ + jabber_si_send_request( tf->ic, tf->bud->full_jid, tf ); + + /* and start the receive logic */ + imcb_file_recv_start( tf->ic, tf->ft ); + +} + +gboolean jabber_si_waitfor_disco( gpointer data, gint fd, b_input_condition cond ) +{ + struct jabber_transfer *tf = data; + struct jabber_data *jd = tf->ic->proto_data; + + tf->disco_timeout_fired++; + + if( tf->bud->features && jd->have_streamhosts==1 ) { + tf->disco_timeout = 0; + jabber_si_transfer_start( tf ); + return FALSE; + } + + /* 8 seconds should be enough for server and buddy to respond */ + if ( tf->disco_timeout_fired < 16 ) + return TRUE; + + if( !tf->bud->features && jd->have_streamhosts!=1 ) + imcb_log( tf->ic, "Couldn't get buddy's features nor discover all services of the server" ); + else if( !tf->bud->features ) + imcb_log( tf->ic, "Couldn't get buddy's features" ); + else + imcb_log( tf->ic, "Couldn't discover some of the server's services" ); + + tf->disco_timeout = 0; + jabber_si_transfer_start( tf ); + return FALSE; +} + +void jabber_si_transfer_request( struct im_connection *ic, file_transfer_t *ft, char *who ) +{ + struct jabber_transfer *tf; + struct jabber_data *jd = ic->proto_data; + struct jabber_buddy *bud; + char *server = jd->server, *s; + + 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 ); + + if( bud == NULL ) + { + imcb_file_canceled( ic, ft, "Couldn't find buddy (BUG?)" ); + return; + } + + imcb_log( ic, "Trying to send %s(%zd bytes) to %s", ft->file_name, ft->file_size, who ); + + tf = g_new0( struct jabber_transfer, 1 ); + + tf->ic = ic; + tf->ft = ft; + tf->fd = -1; + tf->ft->data = tf; + tf->ft->free = jabber_si_free_transfer; + tf->bud = bud; + ft->write = jabber_bs_send_write; + + jd->filetransfers = g_slist_prepend( jd->filetransfers, tf ); + + /* query buddy's features and server's streaming proxies if neccessary */ + + if( !tf->bud->features ) + jabber_iq_query_features( ic, bud->full_jid ); + + /* If <auto> is not set don't check for proxies */ + if( ( jd->have_streamhosts!=1 ) && ( jd->streamhosts==NULL ) && + ( strstr( set_getstr( &ic->acc->set, "proxy" ), "<auto>" ) != NULL ) ) { + jd->have_streamhosts = 0; + jabber_iq_query_server( ic, server, XMLNS_DISCO_ITEMS ); + } else if ( jd->streamhosts!=NULL ) + jd->have_streamhosts = 1; + + /* if we had to do a query, wait for the result. + * Otherwise fire away. */ + if( !tf->bud->features || jd->have_streamhosts!=1 ) + tf->disco_timeout = b_timeout_add( 500, jabber_si_waitfor_disco, tf ); + else + jabber_si_transfer_start( tf ); +} + +/* + * First function that gets called when a file transfer request comes in. + * A lot to parse. + * + * We choose a stream type from the options given by the initiator. + * Then we wait for imcb to call the accept or cancel callbacks. + */ +int jabber_si_handle_request( struct im_connection *ic, struct xt_node *node, struct xt_node *sinode) +{ + struct xt_node *c, *d, *reply; + char *sid, *ini_jid, *tgt_jid, *iq_id, *s, *ext_jid, *size_s; + struct jabber_buddy *bud; + int requestok = FALSE; + char *name, *cmp; + size_t size; + struct jabber_transfer *tf; + struct jabber_data *jd = ic->proto_data; + file_transfer_t *ft; + + /* All this means we expect something like this: ( I think ) + * <iq from=... to=... id=...> + * <si id=id xmlns=si profile=ft> + * <file xmlns=ft/> + * <feature xmlns=feature> + * <x xmlns=xdata type=submit> + * <field var=stream-method> + * + */ + if( !( ini_jid = xt_find_attr( node, "from" ) ) || + !( tgt_jid = xt_find_attr( node, "to" ) ) || + !( iq_id = xt_find_attr( node, "id" ) ) || + !( sid = xt_find_attr( sinode, "id" ) ) || + !( cmp = xt_find_attr( sinode, "profile" ) ) || + !( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) || + !( d = xt_find_node( sinode->children, "file" ) ) || + !( cmp = xt_find_attr( d, "xmlns" ) ) || + !( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) || + !( name = xt_find_attr( d, "name" ) ) || + !( size_s = xt_find_attr( d, "size" ) ) || + !( 1 == sscanf( size_s, "%zd", &size ) ) || + !( d = xt_find_node( sinode->children, "feature" ) ) || + !( cmp = xt_find_attr( d, "xmlns" ) ) || + !( 0 == strcmp( cmp, XMLNS_FEATURE ) ) || + !( d = xt_find_node( d->children, "x" ) ) || + !( cmp = xt_find_attr( d, "xmlns" ) ) || + !( 0 == strcmp( cmp, XMLNS_XDATA ) ) || + !( cmp = xt_find_attr( d, "type" ) ) || + !( 0 == strcmp( cmp, "form" ) ) || + !( d = xt_find_node( d->children, "field" ) ) || + !( cmp = xt_find_attr( d, "var" ) ) || + !( 0 == strcmp( cmp, "stream-method" ) ) ) + { + imcb_log( ic, "WARNING: Received incomplete Stream Initiation request" ); + } + else + { + /* Check if we support one of the options */ + + c = d->children; + while( ( c = xt_find_node( c, "option" ) ) ) + if( ( d = xt_find_node( c->children, "value" ) ) && + ( d->text != NULL ) && + ( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) ) + { + requestok = TRUE; + break; + } + + if ( !requestok ) + imcb_log( ic, "WARNING: Unsupported file transfer request from %s", ini_jid); + } + + if( requestok ) + { + /* Figure out who the transfer should come frome... */ + + ext_jid = ini_jid; + if( ( s = strchr( ini_jid, '/' ) ) ) + { + if( ( bud = jabber_buddy_by_jid( ic, ini_jid, GET_BUDDY_EXACT ) ) ) + { + bud->last_msg = time( NULL ); + ext_jid = bud->ext_jid ? : bud->bare_jid; + } + else + *s = 0; /* We need to generate a bare JID now. */ + } + + if( !( ft = imcb_file_send_start( ic, ext_jid, name, size ) ) ) + { + imcb_log( ic, "WARNING: Error handling transfer request from %s", ini_jid); + requestok = FALSE; + } + + *s = '/'; + } + else + { + reply = jabber_make_error_packet( node, "item-not-found", "cancel", NULL ); + if (!jabber_write_packet( ic, reply )) + imcb_log( ic, "WARNING: Error generating reply to file transfer request" ); + xt_free_node( reply ); + return XT_HANDLED; + } + + /* Request is fine. */ + + tf = g_new0( struct jabber_transfer, 1 ); + + tf->ini_jid = g_strdup( ini_jid ); + tf->tgt_jid = g_strdup( tgt_jid ); + tf->iq_id = g_strdup( iq_id ); + tf->sid = g_strdup( sid ); + tf->ic = ic; + tf->ft = ft; + tf->fd = -1; + tf->ft->data = tf; + tf->ft->accept = jabber_si_answer_request; + tf->ft->free = jabber_si_free_transfer; + tf->ft->canceled = jabber_si_canceled; + + jd->filetransfers = g_slist_prepend( jd->filetransfers, tf ); + + return XT_HANDLED; +} + +/* + * imc called the accept callback which probably means that the user accepted this file transfer. + * We send our response to the initiator. + * In the next step, the initiator will send us a request for the given stream type. + * (currently that can only be a SOCKS5 bytestream) + */ +void jabber_si_answer_request( file_transfer_t *ft ) { + struct jabber_transfer *tf = ft->data; + struct xt_node *node, *sinode, *reply; + + /* generate response, start with the SI tag */ + sinode = xt_new_node( "si", NULL, NULL ); + xt_add_attr( sinode, "xmlns", XMLNS_SI ); + xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER ); + xt_add_attr( sinode, "id", tf->sid ); + + /* now the file tag */ + node = xt_new_node( "file", NULL, NULL ); + xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER ); + + xt_add_child( sinode, node ); + + /* and finally the feature tag */ + node = xt_new_node( "field", NULL, NULL ); + xt_add_attr( node, "var", "stream-method" ); + xt_add_attr( node, "type", "list-single" ); + + /* Currently all we can do. One could also implement in-band (IBB) */ + xt_add_child( node, xt_new_node( "value", XMLNS_BYTESTREAMS, NULL ) ); + + node = xt_new_node( "x", NULL, node ); + xt_add_attr( node, "xmlns", XMLNS_XDATA ); + xt_add_attr( node, "type", "submit" ); + + node = xt_new_node( "feature", NULL, node ); + xt_add_attr( node, "xmlns", XMLNS_FEATURE ); + + xt_add_child( sinode, node ); + + reply = jabber_make_packet( "iq", "result", tf->ini_jid, sinode ); + xt_add_attr( reply, "id", tf->iq_id ); + + if( !jabber_write_packet( tf->ic, reply ) ) + imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" ); + else + tf->accepted = TRUE; + xt_free_node( reply ); +} + +static xt_status jabber_si_handle_response(struct im_connection *ic, struct xt_node *node, struct xt_node *orig ) +{ + struct xt_node *c, *d; + char *ini_jid = NULL, *tgt_jid, *iq_id, *cmp; + GSList *tflist; + struct jabber_transfer *tf=NULL; + struct jabber_data *jd = ic->proto_data; + + if( !( tgt_jid = xt_find_attr( node, "from" ) ) || + !( ini_jid = xt_find_attr( node, "to" ) ) ) + { + imcb_log( ic, "Invalid SI response from=%s to=%s", tgt_jid, ini_jid ); + return XT_HANDLED; + } + + /* All this means we expect something like this: ( I think ) + * <iq from=... to=... id=...> + * <si xmlns=si> + * [ <file xmlns=ft/> ] <-- not neccessary + * <feature xmlns=feature> + * <x xmlns=xdata type=submit> + * <field var=stream-method> + * <value> + */ + if( !( tgt_jid = xt_find_attr( node, "from" ) ) || + !( ini_jid = xt_find_attr( node, "to" ) ) || + !( iq_id = xt_find_attr( node, "id" ) ) || + !( c = xt_find_node( node->children, "si" ) ) || + !( cmp = xt_find_attr( c, "xmlns" ) ) || + !( strcmp( cmp, XMLNS_SI ) == 0 ) || + !( d = xt_find_node( c->children, "feature" ) ) || + !( cmp = xt_find_attr( d, "xmlns" ) ) || + !( strcmp( cmp, XMLNS_FEATURE ) == 0 ) || + !( d = xt_find_node( d->children, "x" ) ) || + !( cmp = xt_find_attr( d, "xmlns" ) ) || + !( strcmp( cmp, XMLNS_XDATA ) == 0 ) || + !( cmp = xt_find_attr( d, "type" ) ) || + !( strcmp( cmp, "submit" ) == 0 ) || + !( d = xt_find_node( d->children, "field" ) ) || + !( cmp = xt_find_attr( d, "var" ) ) || + !( strcmp( cmp, "stream-method" ) == 0 ) || + !( d = xt_find_node( d->children, "value" ) ) ) + { + imcb_log( ic, "WARNING: Received incomplete Stream Initiation response" ); + return XT_HANDLED; + } + + if( !( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) ) { + /* since we should only have advertised what we can do and the peer should + * only have chosen what we offered, this should never happen */ + imcb_log( ic, "WARNING: Received invalid Stream Initiation response, method %s", d->text ); + + return XT_HANDLED; + } + + /* Let's see if we can find out what this bytestream should be for... */ + + for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) ) + { + struct jabber_transfer *tft = tflist->data; + if( ( strcmp( tft->iq_id, iq_id ) == 0 ) ) + { + tf = tft; + break; + } + } + + if (!tf) + { + imcb_log( ic, "WARNING: Received bytestream request from %s that doesn't match an SI request", ini_jid ); + return XT_HANDLED; + } + + tf->ini_jid = g_strdup( ini_jid ); + tf->tgt_jid = g_strdup( tgt_jid ); + + imcb_log( ic, "File %s: %s accepted the transfer!", tf->ft->file_name, tgt_jid ); + + jabber_bs_send_start( tf ); + + return XT_HANDLED; +} + +int jabber_si_send_request(struct im_connection *ic, char *who, struct jabber_transfer *tf ) +{ + struct xt_node *node, *sinode; + struct jabber_buddy *bud; + + /* who knows how many bits the future holds :) */ + char filesizestr[ 1 + ( int ) ( 0.301029995663981198f * sizeof( size_t ) * 8 ) ]; + + const char *methods[] = + { + XMLNS_BYTESTREAMS, + //XMLNS_IBB, + NULL + }; + const char **m; + char *s; + + /* Maybe we should hash this? */ + tf->sid = g_strdup_printf( "BitlBeeJabberSID%d", tf->ft->local_id ); + + 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 ); + + /* start with the SI tag */ + sinode = xt_new_node( "si", NULL, NULL ); + xt_add_attr( sinode, "xmlns", XMLNS_SI ); + xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER ); + xt_add_attr( sinode, "id", tf->sid ); + +/* if( mimetype ) + xt_add_attr( node, "mime-type", mimetype ); */ + + /* now the file tag */ +/* if( desc ) + node = xt_new_node( "desc", descr, NULL ); */ + node = xt_new_node( "range", NULL, NULL ); + + sprintf( filesizestr, "%zd", tf->ft->file_size ); + node = xt_new_node( "file", NULL, node ); + xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER ); + xt_add_attr( node, "name", tf->ft->file_name ); + xt_add_attr( node, "size", filesizestr ); +/* if (hash) + xt_add_attr( node, "hash", hash ); + if (date) + xt_add_attr( node, "date", date ); */ + + xt_add_child( sinode, node ); + + /* and finally the feature tag */ + node = xt_new_node( "field", NULL, NULL ); + xt_add_attr( node, "var", "stream-method" ); + xt_add_attr( node, "type", "list-single" ); + + for ( m = methods ; *m ; m ++ ) + xt_add_child( node, xt_new_node( "option", NULL, xt_new_node( "value", (char *)*m, NULL ) ) ); + + node = xt_new_node( "x", NULL, node ); + xt_add_attr( node, "xmlns", XMLNS_XDATA ); + xt_add_attr( node, "type", "form" ); + + node = xt_new_node( "feature", NULL, node ); + xt_add_attr( node, "xmlns", XMLNS_FEATURE ); + + xt_add_child( sinode, node ); + + /* and we are there... */ + node = jabber_make_packet( "iq", "set", bud ? bud->full_jid : who, sinode ); + jabber_cache_add( ic, node, jabber_si_handle_response ); + tf->iq_id = g_strdup( xt_find_attr( node, "id" ) ); + + return jabber_write_packet( ic, node ); +} |