osip_transaction.c

mediastreamer2是开源的网络传输媒体流的库

    statemachine = &ict_fsm;
  else if (transaction->ctx_type == IST)
    statemachine = &ist_fsm;
  else if (transaction->ctx_type == NICT)
    statemachine = &nict_fsm;
  else
    statemachine = &nist_fsm;
#endif

  if (0 != fsm_callmethod (evt->type,
                            transaction->state, statemachine, evt, transaction))
    {
      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 OSIP_BADPARAMETER;
  if (transaction->ict_context != NULL)
    {
      *ip = transaction->ict_context->destination;
      *port = transaction->ict_context->port;
      return OSIP_SUCCESS;
  } else if (transaction->nict_context != NULL)
    {
      *ip = transaction->nict_context->destination;
      *port = transaction->nict_context->port;
      return OSIP_SUCCESS;
    }
  return OSIP_UNDEFINED_ERROR;
}

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

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

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 OSIP_BADPARAMETER;
  transaction->state = state;
  return OSIP_SUCCESS;
}

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

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

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 OSIP_BADPARAMETER;

  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 OSIP_SYNTAXERROR;
    }
  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 OSIP_SYNTAXERROR;
    }
  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 OSIP_UNDEFINED_ERROR;
      /* the Cseq field */
      if (cseq_match (tr->cseq, response->cseq) != 0)
        return OSIP_UNDEFINED_ERROR;
      /* the To field */
      if (response->to->url->username == NULL && tr->from->url->username != NULL)
        return OSIP_UNDEFINED_ERROR;
      if (response->to->url->username != NULL && tr->from->url->username == NULL)
        return OSIP_UNDEFINED_ERROR;
      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 OSIP_UNDEFINED_ERROR;
      } else
        {
          if (strcmp (response->to->url->host, tr->from->url->host))
            return OSIP_UNDEFINED_ERROR;
        }

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

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 OSIP_BADPARAMETER;

  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 OSIP_SYNTAXERROR;
    }
  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 OSIP_SYNTAXERROR;                  /* 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 OSIP_UNDEFINED_ERROR;
      if ( ! b_request->gvalue )     return OSIP_UNDEFINED_ERROR;

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

      /* 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 OSIP_UNDEFINED_ERROR;          /* 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 OSIP_UNDEFINED_ERROR;
            if (0 != strcmp (b_orighost, b_host))
              return OSIP_UNDEFINED_ERROR;

            if (b_port != NULL && b_origport == NULL
                && 0 != strcmp (b_port, "5060"))
              return OSIP_UNDEFINED_ERROR;
            else if (b_origport != NULL && b_port == NULL
                     && 0 != strcmp (b_origport, "5060"))
              return OSIP_UNDEFINED_ERROR;
            else if (b_origport != NULL && b_port != NULL
                     && 0 != strcmp (b_origport, b_port))
              return OSIP_UNDEFINED_ERROR;
          }
#ifdef AC_BUG
          /* audiocodes bug (MP108-fxs-SIP-4-0-282-380) */
          if (0 != osip_from_tag_match (tr->from, request->from))
            return OSIP_UNDEFINED_ERROR;
#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 OSIP_UNDEFINED_ERROR;
          return OSIP_SUCCESS;
        }
    }

  /* Back to the old backward compatibilty mechanism for matching requests */
  if (0 != osip_call_id_match (tr->callid, request->call_id))
    return OSIP_UNDEFINED_ERROR;
  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 OSIP_UNDEFINED_ERROR;
      } else
        {
          if (0 != osip_to_tag_match (tr->to, request->to))
            return OSIP_UNDEFINED_ERROR;
        }
  } else
    {
      if (0 != osip_to_tag_match (tr->to, request->to))
        return OSIP_UNDEFINED_ERROR;
    }
  if (0 != osip_from_tag_match (tr->from, request->from))
    return OSIP_UNDEFINED_ERROR;
  if (0 != osip_cseq_match (tr->cseq, request->cseq))
    return OSIP_UNDEFINED_ERROR;
  if (0 != osip_via_match (tr->topvia, topvia_request))
    return OSIP_UNDEFINED_ERROR;
  return OSIP_SUCCESS;
}

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 OSIP_SYNTAXERROR;

  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);
  
}