xmpp_component.c

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/*
 * $Id: xmpp_component.c 4585 2008-08-06 08:20:30Z klaus_darilion $
 *
 * XMPP Module
 * This file is part of Kamailio, a free SIP server.
 *
 * Copyright (C) 2006 Voice Sistem S.R.L.
 *
 * Kamailio 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
 *
 * Kamailio 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Andreea Spirea
 *
 */
/*! \file
 * \brief Kamailio XMPP :: XMPP Component interface support
 *  \ingroup xmpp
 */

/*
 * An inbound SIP message:
 *   from sip:user1@domain1 to sip:user2*domain2@gateway_domain
 * is translated to an XMPP message:
 *   from user1*domain1@xmpp_domain to user2@domain2
 *
 * An inbound XMPP message:
 *   from user1@domain1 to user2*domain2@xmpp_domain
 * is translated to a SIP message:
 *   from sip:user1*domain1@gateway_domain to sip:user2@domain2
 *
 * Where '*' is the domain_separator, and gateway_domain and
 * xmpp_domain are defined below.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include "../../sr_module.h"

#include "xmpp.h"
#include "xmpp_api.h"
#include "network.h"
#include "xode.h"

struct xmpp_private_data {
   int fd;     /* socket */
   int running;
};

static int xode_send(int fd, xode x)
{
   char *str = xode_to_str(x);
   int len = strlen(str);
   
   LM_DBG("xode_send [%s]\n", str);

   if (net_send(fd, str, len) != len) {
      LM_ERR("send() error: %s\n", strerror(errno));
      return -1;
   }
   /* should str be freed?!?! */
   return len;
}

static void stream_node_callback(int type, xode node, void *arg) 
{
   struct xmpp_private_data *priv = (struct xmpp_private_data *) arg;
   char *id, *hash, *tag;
   char buf[4096];
   xode x;

   LM_DBG("stream callback: %d: %s\n", type, node ? xode_get_name(node) : "n/a");
   switch (type) {
   case XODE_STREAM_ROOT:
      id = xode_get_attrib(node, "id");
      snprintf(buf, sizeof(buf), "%s%s", id, xmpp_password);
      hash = shahash(buf);
      
      x = xode_new_tag("handshake");
      xode_insert_cdata(x, hash, -1);
      xode_send(priv->fd, x);
      xode_free(x);
      break;
   case XODE_STREAM_NODE:
      tag = xode_get_name(node);
      if (!strcmp(tag, "handshake")) {
         LM_DBG("handshake succeeded\n");
      } else if (!strcmp(tag, "message")) {
         LM_DBG("XMPP IM received\n");
         char *from = xode_get_attrib(node, "from");
         char *to = xode_get_attrib(node, "to");
         char *type = xode_get_attrib(node, "type");
         xode body = xode_get_tag(node, "body");
         char *msg;
         
         if (!type)
            type = "chat";
         if (!strcmp(type, "error")) { 
            LM_DBG("received message error stanza\n");
            goto out;
         }
         
         if (!from || !to || !body) {
            LM_DBG("invalid <message/> attributes\n");
            goto out;
         }

         if (!(msg = xode_get_data(body)))
            msg = "";
         xmpp_send_sip_msg(
            encode_uri_xmpp_sip(from),
            decode_uri_xmpp_sip(to),
            msg);
      } else if (!strcmp(tag, "presence")) {
         /* call presence callbacks */
         LM_DBG("XMPP Presence received\n");
         run_xmpp_callbacks(XMPP_RCV_PRESENCE, xode_to_str(node));
      }else if (!strcmp(tag, "iq")) {
         /* call presence callbacks */
         LM_DBG("XMPP IQ received\n");
         run_xmpp_callbacks(XMPP_RCV_IQ, xode_to_str(node));
      }
      break;
   case XODE_STREAM_ERROR:
      LM_ERR("stream error\n");
      /* fall-through */
   case XODE_STREAM_CLOSE:
      priv->running = 0;
      break;
   }
out:
   xode_free(node);
}

/*!
 *
 */
static int do_send_message_component(struct xmpp_private_data *priv,
      struct xmpp_pipe_cmd *cmd)
{
   xode x;

   LM_DBG("do_send_message_component from=[%s] to=[%s] body=[%s]\n",
         cmd->from, cmd->to, cmd->body);

   x = xode_new_tag("message");
   xode_put_attrib(x, "id", cmd->id); // XXX
   xode_put_attrib(x, "from", encode_uri_sip_xmpp(cmd->from));
   xode_put_attrib(x, "to", decode_uri_sip_xmpp(cmd->to));
   xode_put_attrib(x, "type", "chat");
   xode_insert_cdata(xode_insert_tag(x, "body"), cmd->body, -1);
         
   xode_send(priv->fd, x);
   xode_free(x);

   /* missing error handling here ?!?!*/
   return 0;
}

static int do_send_bulk_message_component(struct xmpp_private_data *priv,
      struct xmpp_pipe_cmd *cmd)
{
   int len;

   LM_DBG("do_send_bulk_message_component from=[%s] to=[%s] body=[%s]\n",
         cmd->from, cmd->to, cmd->body);
   len = strlen(cmd->body);
   if (net_send(priv->fd, cmd->body, len) != len) {
      LM_ERR("do_send_bulk_message_component: %s\n",strerror(errno));
      return -1;
   }
   return 0;
}


int xmpp_component_child_process(int data_pipe)
{
   int fd, maxfd, rv;
   fd_set fdset;
   xode_pool pool;
   xode_stream stream;
   struct xmpp_private_data priv;
   struct xmpp_pipe_cmd *cmd;
   
   while (1) {
      fd = net_connect(xmpp_host, xmpp_port);
      if (fd < 0) {
         sleep(3);
         continue;
      }
      
      priv.fd = fd;
      priv.running = 1;
      
      pool = xode_pool_new();
      stream = xode_stream_new(pool, stream_node_callback, &priv);
      
      net_printf(fd,
         "<?xml version='1.0'?>"
         "<stream:stream xmlns='jabber:component:accept' to='%s' "
         "version='1.0' xmlns:stream='http://etherx.jabber.org/streams'>",
         xmpp_domain);
      
      while (priv.running) {
         FD_ZERO(&fdset);
         FD_SET(data_pipe, &fdset);
         FD_SET(fd, &fdset);
         maxfd = fd > data_pipe ? fd : data_pipe;
         rv = select(maxfd + 1, &fdset, NULL, NULL, NULL);
         
         if (rv < 0) {
            LM_ERR("select() failed: %s\n", strerror(errno));
         } else if (!rv) {
            /* timeout */
         } else if (FD_ISSET(fd, &fdset)) {
            char *buf = net_read_static(fd);

            if (!buf)
               /* connection closed */
               break;

            LM_DBG("server read\n[%s]\n", buf);
            xode_stream_eat(stream, buf, strlen(buf));
         } else if (FD_ISSET(data_pipe, &fdset)) {
            if (read(data_pipe, &cmd, sizeof(cmd)) != sizeof(cmd)) {
               LM_ERR("failed to read from command pipe: %s\n",
                     strerror(errno));
            } else {
               LM_DBG("got pipe cmd %d\n", cmd->type);
               switch (cmd->type) {
               case XMPP_PIPE_SEND_MESSAGE:
                  do_send_message_component(&priv, cmd);
                  break;
               case XMPP_PIPE_SEND_PACKET:
               case XMPP_PIPE_SEND_PSUBSCRIBE:
               case XMPP_PIPE_SEND_PNOTIFY:
                  do_send_bulk_message_component(&priv, cmd);
                  break;
               }
               xmpp_free_pipe_cmd(cmd);
            }
         }
      }
      
      xode_pool_free(pool);
      
      close(fd);
   }
   return 0;
}