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/***************************************************************************\
* *
* 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 );
/* imcb 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 )
{
close( tf->fd );
tf->fd = 0;
}
g_free( tf->ini_jid );
g_free( tf->tgt_jid );
g_free( tf->iq_id );
g_free( tf->sid );
}
/* imcb callback */
void jabber_si_finished( file_transfer_t *ft )
{
struct jabber_transfer *tf = ft->data;
imcb_log( tf->ic, "File %s transferred successfully!" , ft->file_name );
}
/* imcb 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 );
}
/*
* 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;
struct jabber_buddy *bud;
int requestok = FALSE;
char *name;
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" ) ) ||
!( strcmp( xt_find_attr( sinode, "profile" ), XMLNS_FILETRANSFER ) == 0 ) ||
!( d = xt_find_node( sinode->children, "file" ) ) ||
!( strcmp( xt_find_attr( d, "xmlns" ), XMLNS_FILETRANSFER ) == 0 ) ||
!( name = xt_find_attr( d, "name" ) ) ||
!( size = (size_t) atoll( xt_find_attr( d, "size" ) ) ) ||
!( d = xt_find_node( sinode->children, "feature" ) ) ||
!( strcmp( xt_find_attr( d, "xmlns" ), XMLNS_FEATURE ) == 0 ) ||
!( d = xt_find_node( d->children, "x" ) ) ||
!( strcmp( xt_find_attr( d, "xmlns" ), XMLNS_XDATA ) == 0 ) ||
!( strcmp( xt_find_attr( d, "type" ), "form" ) == 0 ) ||
!( d = xt_find_node( d->children, "field" ) ) ||
!( strcmp( xt_find_attr( d, "var" ), "stream-method" ) == 0 ) )
{
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" ) ) &&
( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) )
{
requestok = TRUE;
break;
}
}
if ( requestok )
{
/* Figure out who the transfer should come frome... */
if( ( s = strchr( ini_jid, '/' ) ) )
{
if( ( bud = jabber_buddy_by_jid( ic, ini_jid, GET_BUDDY_EXACT ) ) )
{
bud->last_act = 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
imcb_log( ic, "WARNING: Unsupported file transfer request from %s", ini_jid);
if ( !requestok )
{
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. */
imcb_log( ic, "File transfer request from %s for %s (%zd kb). ", xt_find_attr( node, "from" ), name, size/1024 );
imcb_log( ic, "Accept the DCC transfer if you'd like the file. If you don't, issue the 'transfers reject' command.");
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->ft->data = tf;
tf->ft->accept = jabber_si_answer_request;
tf->ft->free = jabber_si_free_transfer;
tf->ft->finished = jabber_si_finished;
tf->ft->canceled = jabber_si_canceled;
jd->filetransfers = g_slist_prepend( jd->filetransfers, tf );
return XT_HANDLED;
}
/*
* imcb 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 );
}
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