osip_transaction.c

libosip2-3.0.3最新版本

      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_INFO3, NULL, "USELESS event!\n"));
      /* message is useless. */
      if (EVT_IS_MSG (evt))
        {
          if (evt->sip != NULL)
            {
              osip_message_free (evt->sip);
            }
        }
  } else
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_INFO4, NULL,
                   "sipevent evt: method called!\n"));
    }
  osip_free (evt);              /* this is the ONLY place for freeing event!! */
  return 1;
}

int
osip_transaction_get_destination (osip_transaction_t * transaction, char **ip,
                                  int *port)
{
  *ip = NULL;
  *port = 0;
  if (transaction == NULL)
    return -1;
  if (transaction->ict_context != NULL)
    {
      *ip = transaction->ict_context->destination;
      *port = transaction->ict_context->port;
      return 0;
  } else if (transaction->nict_context != NULL)
    {
      *ip = transaction->nict_context->destination;
      *port = transaction->nict_context->port;
      return 0;
    }
  return -1;
}

int
osip_transaction_set_srv_record(osip_transaction_t *transaction, osip_srv_record_t *record)
{
	if (transaction==NULL)
		return -1;
	memcpy(&transaction->record, record, sizeof(osip_srv_record_t));
	return 0;
}

int
osip_transaction_set_your_instance (osip_transaction_t * transaction,
                                    void *instance)
{
  if (transaction == NULL)
    return -1;
  transaction->your_instance = instance;
  return 0;
}

void *
osip_transaction_get_your_instance (osip_transaction_t * transaction)
{
  if (transaction == NULL)
    return NULL;
  return transaction->your_instance;
}

int
__osip_transaction_set_state (osip_transaction_t * transaction, state_t state)
{
  if (transaction == NULL)
    return -1;
  transaction->state = state;
  return 0;
}

int
osip_transaction_set_in_socket (osip_transaction_t * transaction, int sock)
{
  if (transaction == NULL)
    return -1;
  transaction->in_socket = sock;
  return 0;
}

int
osip_transaction_set_out_socket (osip_transaction_t * transaction, int sock)
{
  if (transaction == NULL)
    return -1;
  transaction->out_socket = sock;
  return 0;
}

int
__osip_transaction_matching_response_osip_to_xict_17_1_3 (osip_transaction_t *
                                                          tr,
                                                          osip_message_t *
                                                          response)
{
  osip_generic_param_t *b_request;
  osip_generic_param_t *b_response;
  osip_via_t *topvia_response;

  /* some checks to avoid crashing on bad requests */
  if (tr == NULL || (tr->ict_context == NULL && tr->nict_context == NULL) ||
      /* only ict and nict can match a response */
      response == NULL || response->cseq == NULL || response->cseq->method == NULL)
    return -1;

  topvia_response = osip_list_get (&response->vias, 0);
  if (topvia_response == NULL)
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_ERROR, NULL,
                   "Remote UA is not compliant: missing a Via header!\n"));
      return -1;
    }
  osip_via_param_get_byname (tr->topvia, "branch", &b_request);
  if (b_request == NULL)
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_BUG, NULL,
                   "You created a transaction without any branch! THIS IS NOT ALLOWED\n"));
      return -1;
    }
  osip_via_param_get_byname (topvia_response, "branch", &b_response);
  if (b_response == NULL)
    {
#ifdef FWDSUPPORT
      /* the from tag (unique) */
      if (from_tag_match (tr->from, response->from) != 0)
        return -1;
      /* the Cseq field */
      if (cseq_match (tr->cseq, response->cseq) != 0)
        return -1;
      /* the To field */
      if (response->to->url->username == NULL && tr->from->url->username != NULL)
        return -1;
      if (response->to->url->username != NULL && tr->from->url->username == NULL)
        return -1;
      if (response->to->url->username != NULL && tr->from->url->username != NULL)
        {
          if (strcmp (response->to->url->host, tr->from->url->host) ||
              strcmp (response->to->url->username, tr->from->url->username))
            return -1;
      } else
        {
          if (strcmp (response->to->url->host, tr->from->url->host))
            return -1;
        }

      /* the Call-ID field */
      if (call_id_match (tr->callid, response->call_id) != 0)
        return -1;
      return 0;
#else
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_BUG, NULL,
                   "Remote UA is not compliant: missing a branch parameter in  Via header!\n"));
      return -1;
#endif
    }

  /*
     A response matches a client transaction under two
     conditions:

     1.   If the response has the same value of the branch parameter
     in the top Via header field as the branch parameter in the
     top Via header field of the request that created the
     transaction.
   */
  if (0 != strcmp (b_request->gvalue, b_response->gvalue))
    return -1;
  /*  
     2.   If the method parameter in the CSeq header field matches
     the method of the request that created the transaction. The
     method is needed since a CANCEL request constitutes a
     different transaction, but shares the same value of the
     branch parameter.
     AMD NOTE: cseq->method is ALWAYS the same than the METHOD of the request.
   */
  if (0 == strcmp (response->cseq->method, tr->cseq->method))   /* general case */
    return 0;
  return -1;
}

int
__osip_transaction_matching_request_osip_to_xist_17_2_3 (osip_transaction_t *
                                                         tr,
                                                         osip_message_t * request)
{
  osip_generic_param_t *b_origrequest;
  osip_generic_param_t *b_request;
  osip_via_t *topvia_request;
  size_t length_br;
  size_t length_br2;

  /* some checks to avoid crashing on bad requests */
  if (tr == NULL || (tr->ist_context == NULL && tr->nist_context == NULL) ||
      /* only ist and nist can match a request */
      request == NULL || request->cseq == NULL || request->cseq->method == NULL)
    return -1;

  topvia_request = osip_list_get (&request->vias, 0);
  if (topvia_request == NULL)
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_ERROR, NULL,
                   "Remote UA is not compliant: missing a Via header!\n"));
      return -1;
    }
  osip_via_param_get_byname (topvia_request, "branch", &b_request);
  osip_via_param_get_byname (tr->topvia, "branch", &b_origrequest);

  if ((b_origrequest == NULL && b_request != NULL) ||
      (b_origrequest != NULL && b_request == NULL))
    return -1;                  /* one request is compliant, the other one is not... */

  /* Section 17.2.3 Matching Requests to Server Transactions:
     "The branch parameter in the topmost Via header field of the request
     is examined. If it is present and begins with the magic cookie
     "z9hG4bK", the request was generated by a client transaction
     compliant to this specification."
   */

  if (b_origrequest != NULL && b_request != NULL)
    /* case where both request contains a branch */
    {
      if ( ! b_origrequest->gvalue ) return -1;
      if ( ! b_request->gvalue )     return -1;

      length_br = strlen (b_origrequest->gvalue);
      length_br2 = strlen (b_request->gvalue);
      if (length_br != length_br2)
        return -1;

      /* can't be the same */
      if (0 == strncmp (b_origrequest->gvalue, "z9hG4bK", 7)
          && 0 == strncmp (b_request->gvalue, "z9hG4bK", 7))
        {
          /* both request comes from a compliant UA */
          /* The request matches a transaction if the branch parameter
             in the request is equal to the one in the top Via header
             field of the request that created the transaction, the
             sent-by value in the top Via of the request is equal to
             the one in the request that created the transaction, and in
             the case of a CANCEL request, the method of the request
             that created the transaction was also CANCEL.
           */
          if (0 != strcmp (b_origrequest->gvalue, b_request->gvalue))
            return -1;          /* branch param does not match */
          {
            /* check the sent-by values */
            char *b_port = via_get_port (topvia_request);
            char *b_origport = via_get_port (tr->topvia);
            char *b_host = via_get_host (topvia_request);
            char *b_orighost = via_get_host (tr->topvia);

            if ((b_host == NULL || b_orighost == NULL))
              return -1;
            if (0 != strcmp (b_orighost, b_host))
              return -1;

            if (b_port != NULL && b_origport == NULL
                && 0 != strcmp (b_port, "5060"))
              return -1;
            else if (b_origport != NULL && b_port == NULL
                     && 0 != strcmp (b_origport, "5060"))
              return -1;
            else if (b_origport != NULL && b_port != NULL
                     && 0 != strcmp (b_origport, b_port))
              return -1;
          }
#ifdef AC_BUG
          /* audiocodes bug (MP108-fxs-SIP-4-0-282-380) */
          if (0 != osip_from_tag_match (tr->from, request->from))
            return -1;
#endif
          if (                  /* MSG_IS_CANCEL(request)&& <<-- BUG from the spec?
                                   I always check the CSeq */
               (!(0 == strcmp (tr->cseq->method, "INVITE") &&
                  0 == strcmp (request->cseq->method, "ACK")))
               && 0 != strcmp (tr->cseq->method, request->cseq->method))
            return -1;
          return 0;
        }
    }

  /* Back to the old backward compatibilty mechanism for matching requests */
  if (0 != osip_call_id_match (tr->callid, request->call_id))
    return -1;
  if (MSG_IS_ACK (request))
    {
      osip_generic_param_t *tag_from1;
      osip_generic_param_t *tag_from2;

      osip_from_param_get_byname (tr->to, "tag", &tag_from1);
      osip_from_param_get_byname (request->to, "tag", &tag_from2);
      if (tag_from1 == NULL && tag_from2 != NULL)
        {                       /* do not check it as it can be a new tag when the final
                                   answer has a tag while an INVITE doesn't have one */
      } else if (tag_from1 != NULL && tag_from2 == NULL)
        {
          return -1;
      } else
        {
          if (0 != osip_to_tag_match (tr->to, request->to))
            return -1;
        }
  } else
    {
      if (0 != osip_to_tag_match (tr->to, request->to))
        return -1;
    }
  if (0 != osip_from_tag_match (tr->from, request->from))
    return -1;
  if (0 != osip_cseq_match (tr->cseq, request->cseq))
    return -1;
  if (0 != osip_via_match (tr->topvia, topvia_request))
    return -1;
  return 0;
}

osip_event_t *
__osip_transaction_need_timer_x_event (void *xixt, struct timeval *timer,
				       int cond_state,
				       int transactionid,
				       int TIMER_VAL)
{
  struct timeval now;

  osip_gettimeofday (&now, NULL);

  if (xixt == NULL)
    return NULL;
  if (cond_state)
    {
      if (timer->tv_sec == -1)
        return NULL;
      if (osip_timercmp (&now, timer, >))
        return __osip_event_new (TIMER_VAL, transactionid);
    }
  return NULL;
}

int
__osip_transaction_snd_xxx (osip_transaction_t * ist, osip_message_t * msg)
{
  osip_t *osip = (osip_t *) ist->config;
  osip_via_t *via;
  char *host;
  int port;
  osip_generic_param_t *maddr;
  osip_generic_param_t *received;
  osip_generic_param_t *rport;

  via = (osip_via_t *) osip_list_get (&msg->vias, 0);
  if (!via)
    return -1;

  osip_via_param_get_byname (via, "maddr", &maddr);
  osip_via_param_get_byname (via, "received", &received);
  osip_via_param_get_byname (via, "rport", &rport);
  /* 1: user should not use the provided information
     (host and port) if they are using a reliable
     transport. Instead, they should use the already
     open socket attached to this transaction. */
  /* 2: check maddr and multicast usage */
  if (maddr != NULL)
    host = maddr->gvalue;
  /* we should check if this is a multicast address and use
     set the "ttl" in this case. (this must be done in the
     UDP message (not at the SIP layer) */
  else if (received != NULL)
    host = received->gvalue;
  else
    host = via->host;
  
  if (rport == NULL || rport->gvalue == NULL)
    {
      if (via->port != NULL)
	port = osip_atoi (via->port);
          else
            port = 5060;
    } else
      port = osip_atoi (rport->gvalue);
  
  return osip->cb_send_message (ist, msg, host,
				port, ist->out_socket);
  
}