Initial import of jabber file receive and DCC send support. This introduces

only a few changes to bitlbees code, mainly the addition of the "transfers"
command.

This is known to work with Kopete, Psi, and Pidgin (formerly known as gaim).
At least with Pidgin also over a proxy. DCC has only been tested with irssi.
IPV6 is untested but should work.

Currently, only receiving via SOCKS5BYTESREAMS is implemented.  I'm not sure if
the alternative(in-band bytestreams IBB) is worth implementing since I didn't
see a client yet that can do it. Additionally, it is probably very slow and
needs support by the server as well.

1 files changed, 246 insertions, 0 deletions

diff --git a/protocols/jabber/si.c b/protocols/jabber/si.c
new file mode 100644
index 00000000..d16f723a
--- /dev/null
+++ b/protocols/jabber/si.c
@@ -0,0 +1,246 @@
+/***************************************************************************\
+*                                                                           *
+*  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 );
+}