udp.c

mediastreamer2是开源的网络传输媒体流的库

      osip_list_add (&eXosip.j_transactions, transaction, 0);

      REMOVE_ELEMENT (eXosip.j_subscribes, js);
      eXosip_subscribe_free (js);
      __eXosip_wakeup ();

      return;
  } else
    {
      osip_transaction_set_your_instance (transaction,
                                          __eXosip_new_jinfo (NULL, jd, js, NULL));
      js->s_ss_status = EXOSIP_SUBCRSTATE_ACTIVE;
    }
#else
  /* modify the status of user */
  if (0 == osip_strncasecmp (sub_state->hvalue, "active", 6))
    {
      js->s_ss_status = EXOSIP_SUBCRSTATE_ACTIVE;
  } else if (0 == osip_strncasecmp (sub_state->hvalue, "pending", 7))
    {
      js->s_ss_status = EXOSIP_SUBCRSTATE_PENDING;
    }

  if (0 == osip_strncasecmp (sub_state->hvalue, "terminated", 10))
    {
      /* delete the dialog! */
      js->s_ss_status = EXOSIP_SUBCRSTATE_TERMINATED;

      {
        eXosip_event_t *je;

        je =
          eXosip_event_init_for_subscribe (EXOSIP_SUBSCRIPTION_NOTIFY, js, jd,
                                           transaction);
        if (je->request == NULL && evt->sip != NULL)
          {
            i = osip_message_clone (evt->sip, &je->request);
            if (i != 0)
              {
                OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_ERROR, NULL,
                                        "failed to clone request for event\n"));
              }
          }

        eXosip_event_add (je);
      }

      sipevent = osip_new_outgoing_sipmessage (answer);
      sipevent->transactionid = transaction->transactionid;
      osip_transaction_add_event (transaction, sipevent);

      osip_list_add (&eXosip.j_transactions, transaction, 0);

      REMOVE_ELEMENT (eXosip.j_subscribes, js);
      eXosip_subscribe_free (js);
      __eXosip_wakeup ();
      return;
  } else
    {
      osip_transaction_set_your_instance (transaction,
                                          __eXosip_new_jinfo (NULL, jd, js, NULL));
    }
#endif

  osip_list_add (jd->d_inc_trs, transaction, 0);

  sipevent = osip_new_outgoing_sipmessage (answer);
  sipevent->transactionid = transaction->transactionid;
  osip_transaction_add_event (transaction, sipevent);

  __eXosip_wakeup ();
  return;
}

static int
eXosip_match_notify_for_subscribe (eXosip_subscribe_t * js,
                                   osip_message_t * notify)
{
  osip_transaction_t *out_sub;

  if (js == NULL)
    return OSIP_BADPARAMETER;
  OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_INFO1, NULL,
                          "Trying to match notify with subscribe\n"));

  out_sub = eXosip_find_last_out_subscribe (js, NULL);
  if (out_sub == NULL || out_sub->orig_request == NULL)
    return OSIP_NOTFOUND;
  OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_INFO1, NULL,
                          "subscribe transaction found\n"));

  /* some checks to avoid crashing on bad requests */
  if (notify == NULL)
    return OSIP_BADPARAMETER;

  if (notify->cseq == NULL || notify->cseq->method == NULL || notify->to == NULL)
    return OSIP_SYNTAXERROR;

  if (0 != osip_call_id_match (out_sub->callid, notify->call_id))
    return OSIP_UNDEFINED_ERROR;

  {
    /* The From tag of outgoing request must match
       the To tag of incoming notify:
     */
    osip_generic_param_t *tag_from;
    osip_generic_param_t *tag_to;

    osip_from_param_get_byname (out_sub->from, "tag", &tag_from);
    osip_from_param_get_byname (notify->to, "tag", &tag_to);
    if (tag_to == NULL || tag_to->gvalue == NULL)
      {
        OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_ERROR, NULL,
                                "Uncompliant user agent: no tag in from of outgoing request\n"));
        return OSIP_SYNTAXERROR;
      }
    if (tag_from == NULL || tag_to->gvalue == NULL)
      {
        OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_ERROR, NULL,
                                "Uncompliant user agent: no tag in to of incoming request\n"));
        return OSIP_SYNTAXERROR;
      }

    if (0 != strcmp (tag_from->gvalue, tag_to->gvalue))
      return OSIP_UNDEFINED_ERROR;
  }

  return OSIP_SUCCESS;
}

#endif


static void
eXosip_process_message_within_dialog (eXosip_call_t * jc,
                                      eXosip_dialog_t * jd,
                                      osip_transaction_t * transaction,
                                      osip_event_t * evt)
{
  osip_list_add (jd->d_inc_trs, transaction, 0);
#ifndef MINISIZE
  osip_transaction_set_your_instance (transaction,
                                      __eXosip_new_jinfo (jc, jd, NULL, NULL));
#else
  osip_transaction_set_your_instance (transaction, __eXosip_new_jinfo (jc, jd));
#endif
  __eXosip_wakeup ();
  return;
}


static void
eXosip_process_newrequest (osip_event_t * evt, int socket)
{
  osip_transaction_t *transaction;
#ifndef MINISIZE
  osip_event_t *evt_answer;
  osip_message_t *answer;
#endif
  int i;
  int ctx_type;
  eXosip_call_t *jc;
#ifndef MINISIZE
  eXosip_subscribe_t *js;
  eXosip_notify_t *jn;
#endif
  eXosip_dialog_t *jd;

  if (MSG_IS_INVITE (evt->sip))
    {
      ctx_type = IST;
  } else if (MSG_IS_ACK (evt->sip))
    {                           /* this should be a ACK for 2xx (but could be a late ACK!) */
      ctx_type = -1;
  } else if (MSG_IS_REQUEST (evt->sip))
    {
      ctx_type = NIST;
  } else
    {                           /* We should handle late response and 200 OK before coming here. */
      ctx_type = -1;
      osip_event_free (evt);
      return;
    }

  transaction = NULL;
  if (ctx_type != -1)
    {
      i = _eXosip_transaction_init (&transaction,
                                    (osip_fsm_type_t) ctx_type,
                                    eXosip.j_osip, evt->sip);
      if (i != 0)
        {
          osip_event_free (evt);
          return;
        }

      osip_transaction_set_in_socket (transaction, socket);
      osip_transaction_set_out_socket (transaction, socket);

      evt->transactionid = transaction->transactionid;
      osip_transaction_set_your_instance (transaction, NULL);

      osip_transaction_add_event (transaction, evt);
    }

  if (MSG_IS_CANCEL (evt->sip))
    {
      /* special handling for CANCEL */
      /* in the new spec, if the CANCEL has a Via branch, then it
         is the same as the one in the original INVITE */
      eXosip_process_cancel (transaction, evt);
      return;
    }

  jd = NULL;
  /* first, look for a Dialog in the map of element */
  for (jc = eXosip.j_calls; jc != NULL; jc = jc->next)
    {
      for (jd = jc->c_dialogs; jd != NULL; jd = jd->next)
        {
          if (jd->d_dialog != NULL)
            {
              if (osip_dialog_match_as_uas (jd->d_dialog, evt->sip) == 0)
                break;
            }
        }
      if (jd != NULL)
        break;
    }

  /* check CSeq */
  if (jd != NULL && transaction != NULL && evt->sip != NULL
      && evt->sip->cseq != NULL && evt->sip->cseq->number != NULL)
    {
      if (jd->d_dialog != NULL && jd->d_dialog->remote_cseq > 0)
        {
          int cseq = osip_atoi (evt->sip->cseq->number);
          if (cseq == jd->d_dialog->remote_cseq)
            {
              OSIP_TRACE (osip_trace
                          (__FILE__, __LINE__, OSIP_ERROR, NULL,
                           "eXosip: receive a request with same cseq??\n"));
              osip_transaction_free (transaction);
              return;
            }
          if (cseq <= jd->d_dialog->remote_cseq)
            {
              eXosip_send_default_answer (jd, transaction, evt, 500,
                                          NULL, "Wrong Lower CSeq", __LINE__);
              return;
            }
        }
    }
#ifndef MINISIZE
  if (ctx_type == IST)
    {
      i = _eXosip_build_response_default (&answer, NULL, 100, evt->sip);
      if (i != 0)
        {
          __eXosip_delete_jinfo (transaction);
          osip_transaction_free (transaction);
          return;
        }

      osip_message_set_content_length (answer, "0");
      /*  send message to transaction layer */

      evt_answer = osip_new_outgoing_sipmessage (answer);
      evt_answer->transactionid = transaction->transactionid;

      /* add the REQUEST & the 100 Trying */
      osip_transaction_add_event (transaction, evt_answer);
      __eXosip_wakeup ();
    }
#endif

  if (jd != NULL)
    {
      osip_transaction_t *old_trn;

      /* it can be:
         1: a new INVITE offer.
         2: a REFER request from one of the party.
         2: a BYE request from one of the party.
         3: a REQUEST with a wrong CSeq.
         4: a NOT-SUPPORTED method with a wrong CSeq.
       */

      if (transaction == NULL)
        {
          /* cannot answer ACK transaction */
      } else if (!MSG_IS_BYE (evt->sip))
        {
          /* reject all requests for a closed dialog */
          old_trn = eXosip_find_last_inc_transaction (jc, jd, "BYE");
          if (old_trn == NULL)
            old_trn = eXosip_find_last_out_transaction (jc, jd, "BYE");

          if (old_trn != NULL)
            {
              osip_list_add (&eXosip.j_transactions, transaction, 0);
              eXosip_send_default_answer (jd, transaction, evt, 481, NULL,
                                          NULL, __LINE__);
              return;
            }
        }

      if (transaction != NULL)  /* NOT for ACK */
        osip_dialog_update_osip_cseq_as_uas (jd->d_dialog, evt->sip);

      if (MSG_IS_INVITE (evt->sip))
        {
          /* the previous transaction MUST be freed */
          old_trn = eXosip_find_last_inc_invite (jc, jd);

          if (old_trn != NULL && old_trn->state != IST_COMPLETED
              && old_trn->state != IST_TERMINATED)
            {
              osip_list_add (&eXosip.j_transactions, transaction, 0);
              eXosip_send_default_answer (jd, transaction, evt, 500,
                                          "Retry Later",
                                          "An INVITE is not terminated", __LINE__);
              return;
            }

          old_trn = eXosip_find_last_out_invite (jc, jd);
          if (old_trn != NULL && old_trn->state != ICT_COMPLETED
              && old_trn->state != ICT_TERMINATED)
            {
              osip_list_add (&eXosip.j_transactions, transaction, 0);
              eXosip_send_default_answer (jd, transaction, evt, 491, NULL,
                                          NULL, __LINE__);
              return;
            }

          /* osip_dialog_update_osip_cseq_as_uas (jd->d_dialog, evt->sip); */
          osip_dialog_update_route_set_as_uas (jd->d_dialog, evt->sip);

          eXosip_process_reinvite (jc, jd, transaction, evt);
      } else if (MSG_IS_BYE (evt->sip))
        {
          osip_generic_param_t *tag_to = NULL;
          if (evt->sip->to != NULL)
            osip_from_param_get_byname (evt->sip->to, "tag", &tag_to);
          if (tag_to == NULL || tag_to->gvalue == NULL)
            {
              OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_ERROR, NULL,
                                      "Uncompliant user agent: missing a tag in To of incoming BYE\n"));
              osip_list_add (&eXosip.j_transactions, transaction, 0);
              eXosip_send_default_answer (jd, transaction, evt, 481,
                                          "Missing tags in BYE",
                                          "Missing tags in BYE", __LINE__);
              return;
            }

          old_trn = eXosip_find_last_inc_transaction (jc, jd, "BYE");

          if (old_trn != NULL)  /* && old_trn->state!=NIST_TERMINATED) */
            {                   /* this situation should NEVER occur?? (we can't receive
                                   two different BYE for one call! */
              osip_list_add (&eXosip.j_transactions, transaction, 0);
              eXosip_send_default_answer (jd, transaction, evt, 500,
                                          "Call Already Terminated",
                                          "A pending BYE has already terminate this call",
                                          __LINE__);
              return;
            }
          /* osip_transaction_free(old_trn); */
          eXosip_process_bye (jc, jd, transaction, evt);
      } else if (MSG_IS_ACK (evt->sip))
        {
          eXosip_process_ack (jc, jd, evt);
      } else
        {
          eXosip_process_message_within_dialog (jc, jd, transaction, evt);
        }
      return;
    }

  if (MSG_IS_ACK (evt->sip))
    {
      /* no transaction has been found for this ACK! */
      osip_event_free (evt);
      return;
    }

  if (MSG_IS_INFO (evt->sip))
    {
      osip_list_add (&eXosip.j_transactions, transaction, 0);
      eXosip_send_default_answer (jd, transaction, evt, 481, NULL, NULL, __LINE__);