jcallback.c

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      else if (jd != NULL && MSG_IS_RESPONSE_FOR (sip, "SUBSCRIBE"))
        {
          eXosip_event_t *je;

          je =
            eXosip_event_init_for_subscribe (EXOSIP_SUBSCRIPTION_PROCEEDING,
                                             js, jd, tr);
          report_event (je, sip);
        }
#endif
      if (MSG_TEST_CODE (sip, 180) && jd != NULL)
        {
          jd->d_STATE = JD_RINGING;
      } else if (MSG_TEST_CODE (sip, 183) && jd != NULL)
        {
          jd->d_STATE = JD_QUEUED;
        }
    }
}

static void
cb_rcv2xx_4invite (osip_transaction_t * tr, osip_message_t * sip)
{
  int i;
  eXosip_dialog_t *jd;
  eXosip_call_t *jc;
  jinfo_t *jinfo = (jinfo_t *) osip_transaction_get_your_instance (tr);

  if (jinfo == NULL)
    return;
  jd = jinfo->jd;
  jc = jinfo->jc;
  if (jd == NULL)               /* This transaction initiate a dialog in the case of
                                   INVITE (else it would be attached to a "jd" element. */
    {
      /* allocate a jd */
      i = eXosip_dialog_init_as_uac (&jd, sip);
      if (i != 0)
        {
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "eXosip: cannot establish a dialog\n"));
          return;
        }
      ADD_ELEMENT (jc->c_dialogs, jd);
      jinfo->jd = jd;
      eXosip_update ();
      osip_transaction_set_your_instance (tr, jinfo);
  } else
    {
      /* Here is a special case:
         We have initiated a dialog and we have received informationnal
         answers from 2 or more remote SIP UA. Those answer can be
         differentiated with the "To" header's tag.

         We have used the first informationnal answer to create a
         dialog, but we now want to be sure the 200ok received is
         for the dialog this dialog.

         We have to check the To tag and if it does not match, we
         just have to modify the existing dialog and replace it. */
      osip_generic_param_t *tag;
      int i;

      i = osip_to_get_tag (sip->to, &tag);
      i = 1;                    /* default is the same dialog */

      if (jd->d_dialog == NULL || jd->d_dialog->remote_tag == NULL)
        {
          /* There are real use-case where a BYE is received/processed before
             the 200ok of the previous INVITE. In this case, jd->d_dialog is
             empty and the transaction should be silently discarded. */
          /* a ACK should still be sent... -but there is no dialog built- */
          return;
        }

      if (jd->d_dialog->remote_tag == NULL && tag == NULL)
        {
        } /* non compliant remote UA -> assume it is the same dialog */
      else if (jd->d_dialog->remote_tag != NULL && tag == NULL)
        {
          i = 0;
        } /* different dialog! */
      else if (jd->d_dialog->remote_tag == NULL && tag != NULL)
        {
          i = 0;
        } /* different dialog! */
      else if (jd->d_dialog->remote_tag != NULL && tag != NULL
               && tag->gvalue != NULL
               && 0 != strcmp (jd->d_dialog->remote_tag, tag->gvalue))
        {
          i = 0;
        }
      /* different dialog! */
      if (i == 1)               /* just update the dialog */
        {
          osip_dialog_update_route_set_as_uac (jd->d_dialog, sip);
          if (jd->d_dialog->remote_tag == NULL)
            osip_dialog_update_tag_as_uac (jd->d_dialog, sip);
          osip_dialog_set_state (jd->d_dialog, DIALOG_CONFIRMED);
      } else
        {
          /* the best thing is to replace the current dialog
             information... Much easier than creating a useless dialog! */
          osip_dialog_free (jd->d_dialog);
          i = osip_dialog_init_as_uac (&(jd->d_dialog), sip);
          if (i != 0)
            {
              OSIP_TRACE (osip_trace
                          (__FILE__, __LINE__, OSIP_ERROR, NULL,
                           "Cannot replace the dialog.\r\n"));
          } else
            {
              jd->d_dialog->local_cseq = jd->d_dialog->local_cseq + jd->d_mincseq;
              jd->d_mincseq = 0;
              OSIP_TRACE (osip_trace
                          (__FILE__, __LINE__, OSIP_WARNING, NULL,
                           "The dialog has been replaced with the new one from 200ok.\r\n"));
            }
        }
    }

  jd->d_STATE = JD_ESTABLISHED;

  /* eXosip_dialog_set_200ok (jd, sip); */

  report_call_event (EXOSIP_CALL_ANSWERED, jc, jd, tr);

  /* look for the SDP information and decide if this answer was for
     an initial INVITE, an HoldCall, or a RetreiveCall */

  /* don't handle hold/unhold by now... */
  /* eXosip_update_audio_session(tr); */

}

#ifndef MINISIZE
static void
cb_rcv2xx_4subscribe (osip_transaction_t * tr, osip_message_t * sip)
{
  int i;
  eXosip_dialog_t *jd;
  eXosip_subscribe_t *js;
  jinfo_t *jinfo = (jinfo_t *) osip_transaction_get_your_instance (tr);

  if (jinfo == NULL)
    return;
  jd = jinfo->jd;
  js = jinfo->js;
  _eXosip_subscribe_set_refresh_interval (js, sip);


  /* for SUBSCRIBE, test if the dialog has been already created
     with a previous NOTIFY */
  if (jd == NULL && js != NULL && js->s_dialogs != NULL
      && MSG_IS_RESPONSE_FOR (sip, "SUBSCRIBE"))
    {
      /* find if existing dialog match the to tag */
      osip_generic_param_t *tag;
      int i;

      i = osip_to_get_tag (sip->to, &tag);
      if (i == 0 && tag != NULL && tag->gvalue != NULL)
        {
          for (jd = js->s_dialogs; jd != NULL; jd = jd->next)
            {
              if (0 == strcmp (jd->d_dialog->remote_tag, tag->gvalue))
                {
                  OSIP_TRACE (osip_trace
                              (__FILE__, __LINE__, OSIP_INFO1, NULL,
                               "eXosip: found established early dialog for this subscribe\n"));
                  jinfo->jd = jd;
                  break;
                }
            }
        }
    }

  if (jd == NULL)               /* This transaction initiate a dialog in the case of
                                   SUBSCRIBE (else it would be attached to a "jd" element. */
    {
      /* allocate a jd */
      i = eXosip_dialog_init_as_uac (&jd, sip);
      if (i != 0)
        {
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "eXosip: cannot establish a dialog\n"));
          return;
        }
      ADD_ELEMENT (js->s_dialogs, jd);
      jinfo->jd = jd;
      eXosip_update ();
      osip_transaction_set_your_instance (tr, jinfo);
  } else
    {
      osip_dialog_update_route_set_as_uac (jd->d_dialog, sip);
      if (jd->d_dialog->remote_tag == NULL)
        osip_dialog_update_tag_as_uac (jd->d_dialog, sip);
      osip_dialog_set_state (jd->d_dialog, DIALOG_CONFIRMED);
    }

  jd->d_STATE = JD_ESTABLISHED;
  /* look for the body information */

  {
    eXosip_event_t *je;

    je =
      eXosip_event_init_for_subscribe (EXOSIP_SUBSCRIPTION_ANSWERED, js, jd, tr);
    report_event (je, sip);
  }

}

#endif

static int
_eXosip_update_expires_according_to_contact (eXosip_reg_t * jreg,
                                             osip_transaction_t * tr,
                                             osip_message_t * sip)
{
  osip_contact_t *co_register;
  int pos;
  if (jreg == NULL)
    return OSIP_BADPARAMETER;

  /* only update if only one Contact was in INVITE */
  if (tr->orig_request == NULL)
    return OSIP_BADPARAMETER;

  if (osip_list_size (&tr->orig_request->contacts) != 1)
    return OSIP_SUCCESS;


  /* search for matching contact (line parameter must be equal) */
  pos = 0;
  co_register = (osip_contact_t *) osip_list_get (&sip->contacts, pos);
  while (co_register != NULL)
    {
      osip_uri_param_t *line_param = NULL;
      if (co_register->url != NULL)
        osip_uri_uparam_get_byname (co_register->url, "line", &line_param);

      if (line_param != NULL && line_param->gvalue != NULL)
        {
          if (osip_strcasecmp (jreg->r_line, line_param->gvalue) == 0)
            {
              /* found contact */
              int val;
              osip_generic_param_t *exp_param = NULL;
              osip_contact_param_get_byname (co_register, "expires", &exp_param);
              if (exp_param != NULL && exp_param->gvalue != NULL)
                {
                  val = atoi (exp_param->gvalue);
                  /* update only if expires value has REALLY be
                     decreased (more than one minutes):
                     In many cases value is decreased because a few seconds has
                     elapsed when server send the 200ok. */
                  if (val < jreg->r_reg_period - 60)
                    {
                      jreg->r_reg_period = val + 60;
                      return OSIP_SUCCESS;
                    }
                }
              return OSIP_SUCCESS;
            }
        }

      pos++;
      co_register = (osip_contact_t *) osip_list_get (&sip->contacts, pos);
    }



  return OSIP_NOTFOUND;
}


static void
cb_rcv2xx (int type, osip_transaction_t * tr, osip_message_t * sip)
{
  eXosip_dialog_t *jd;
  eXosip_call_t *jc;
#ifndef MINISIZE
  eXosip_subscribe_t *js;
  eXosip_notify_t *jn;
#endif
  jinfo_t *jinfo = (jinfo_t *) osip_transaction_get_your_instance (tr);

  OSIP_TRACE (osip_trace
              (__FILE__, __LINE__, OSIP_INFO3, NULL, "cb_rcv2xx (id=%i)\r\n",
               tr->transactionid));

  udp_tl_learn_port_from_via (sip);

#ifndef MINISIZE
  if (MSG_IS_RESPONSE_FOR (sip, "PUBLISH"))
    {
      eXosip_pub_t *pub = NULL;
      eXosip_event_t *je;
      int i;

      i = _eXosip_pub_update (&pub, tr, sip);
      if (i != 0)
        {
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "cb_rcv2xx (id=%i) No publication to update\r\n",
                       tr->transactionid));
        }
      if (pub != NULL)
        {
          /* update registration interval */
          osip_header_t *exp;

          osip_message_header_get_byname (sip, "expires", 0, &exp);
          if (exp != NULL && exp->hvalue != NULL)
            {
              int val = atoi (exp->hvalue);
              if (val > 0)
                {
                  /* update only if expires value has REALLY be
                     decreased (more than one minutes):
                     In many cases value is decreased because a few seconds has
                     elapsed when server send the 200ok. */
                  if (val < pub->p_period - 60)
                    {
                      pub->p_period = val + 60;
                    }
                }
            }
          pub->p_retry = 0;     /* reset value */
        }

      je = eXosip_event_init_for_message (EXOSIP_MESSAGE_ANSWERED, tr);
      report_event (je, sip);
      return;
  } else
#endif
  if (MSG_IS_RESPONSE_FOR (sip, "REGISTER"))
    {
      eXosip_event_t *je;
      eXosip_reg_t *jreg = NULL;

      /* find matching j_reg */
      _eXosip_reg_find (&jreg, tr);
      if (jreg != NULL)
        {
          /* update registration interval */
          osip_header_t *exp;

          osip_message_header_get_byname (sip, "expires", 0, &exp);
          if (exp != NULL && exp->hvalue != NULL)
            {
              int val = atoi (exp->hvalue);
              if (val > 0)
                {
                  /* update only if expires value has REALLY be
                     decreased (more than one minutes):
                     In many cases value is decreased because a few seconds has
                     elapsed when server send the 200ok. */
                  if (val < jreg->r_reg_period - 60)
                    {
                      jreg->r_reg_period = val + 60;
                    }
                }
            }

          _eXosip_update_expires_according_to_contact (jreg, tr, sip);

          je = eXosip_event_init_for_reg (EXOSIP_REGISTRATION_SUCCESS, jreg, tr);
          report_event (je, sip);
          jreg->r_retry = 0;    /* reset value */
        }

      return;
    }

  if (jinfo == NULL)
    return;
  jd = jinfo->jd;
  jc = jinfo->jc;
#ifndef MINISIZE
  jn = jinfo->jn;
  js = jinfo->js;
#endif

  if (jd != NULL)
    jd->d_retry = 0;            /* reset marker for authentication */
  if (jc != NULL)
    jc->c_retry = 0;            /* reset marker for authentication */
#ifndef MINISIZE
  if (js != NULL)
    js->s_retry = 0;            /* reset marker for authentication */
#endif

  if (MSG_IS_RESPONSE_FOR (sip, "INVITE"))
    {
      cb_rcv2xx_4invite (tr, sip);
  } else if (MSG_IS_RESPONSE_FOR (sip, "BYE"))
    {
      if (jd != NULL)
        jd->d_STATE = JD_TERMINATED;
      report_call_event (EXOSIP_CALL_MESSAGE_ANSWERED, jc, jd, tr);
    }