Hu Chunming / sip_server

/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <osipparser2/internal.h>

#include <osipparser2/osip_port.h>
#include <osipparser2/osip_message.h>
#include <osipparser2/osip_parser.h>

int osip_cseq_init(osip_cseq_t **cseq) {
  *cseq = (osip_cseq_t *) osip_malloc(sizeof(osip_cseq_t));

  if (*cseq == NULL)
    return OSIP_NOMEM;

  (*cseq)->method = NULL;
  (*cseq)->number = NULL;
  return OSIP_SUCCESS;
}

/* fills the cseq header of message.               */
/* INPUT :  char *hvalue | value of header.   */
/* OUTPUT: osip_message_t *sip | structure to save results. */
/* returns -1 on error. */
int osip_message_set_cseq(osip_message_t *sip, const char *hvalue) {
  int i;

  if (hvalue == NULL || hvalue[0] == '\0')
    return OSIP_SUCCESS;

  if (sip->cseq != NULL)
    return OSIP_BADPARAMETER;

  i = osip_cseq_init(&(sip->cseq));

  if (i != 0)
    return i;

  sip->message_property = 2;
  i = osip_cseq_parse(sip->cseq, hvalue);

  if (i != 0) {
    osip_cseq_free(sip->cseq);
    sip->cseq = NULL;
    return i;
  }

  return OSIP_SUCCESS;
}

/* fills the cseq strucuture.                      */
/* INPUT : char *hvalue | value of header.         */
/* OUTPUT: osip_message_t *sip | structure to save results. */
/* returns -1 on error. */
int osip_cseq_parse(osip_cseq_t *cseq, const char *hvalue) {
  char *method = NULL;
  const char *end = NULL;

  if (cseq == NULL || hvalue == NULL)
    return OSIP_BADPARAMETER;

  cseq->number = NULL;
  cseq->method = NULL;

  method = strchr(hvalue, ' '); /* SEARCH FOR SPACE */

  if (method == NULL)
    return OSIP_SYNTAXERROR;

  end = hvalue + strlen(hvalue);

  if (method - hvalue + 1 < 2)
    return OSIP_SYNTAXERROR;

  cseq->number = (char *) osip_malloc(method - hvalue + 1);

  if (cseq->number == NULL)
    return OSIP_NOMEM;

  osip_clrncpy(cseq->number, hvalue, method - hvalue);

  if (end - method + 1 < 2)
    return OSIP_SYNTAXERROR;

  cseq->method = (char *) osip_malloc(end - method + 1);

  if (cseq->method == NULL)
    return OSIP_NOMEM;

  osip_clrncpy(cseq->method, method + 1, end - method);

  return OSIP_SUCCESS; /* ok */
}

#ifndef MINISIZE
/* returns the cseq header.            */
/* INPUT : osip_message_t *sip | sip message.   */
/* returns null on error. */
osip_cseq_t *osip_message_get_cseq(const osip_message_t *sip) {
  return sip->cseq;
}
#endif

char *osip_cseq_get_number(osip_cseq_t *cseq) {
  return cseq->number;
}

char *osip_cseq_get_method(osip_cseq_t *cseq) {
  return cseq->method;
}

void osip_cseq_set_number(osip_cseq_t *cseq, char *number) {
  cseq->number = (char *) number;
}

void osip_cseq_set_method(osip_cseq_t *cseq, char *method) {
  cseq->method = (char *) method;
}

/* returns the cseq header as a string.          */
/* INPUT : osip_cseq_t *cseq | cseq header.  */
/* returns null on error. */
int osip_cseq_to_str(const osip_cseq_t *cseq, char **dest) {
  size_t len;

  *dest = NULL;

  if ((cseq == NULL) || (cseq->number == NULL) || (cseq->method == NULL))
    return OSIP_BADPARAMETER;

  len = strlen(cseq->method) + strlen(cseq->number) + 2;
  *dest = (char *) osip_malloc(len);

  if (*dest == NULL)
    return OSIP_NOMEM;

  snprintf(*dest, len, "%s %s", cseq->number, cseq->method);
  return OSIP_SUCCESS;
}

/* deallocates a osip_cseq_t structure.  */
/* INPUT : osip_cseq_t *cseq | cseq. */
void osip_cseq_free(osip_cseq_t *cseq) {
  if (cseq == NULL)
    return;

  osip_free(cseq->method);
  osip_free(cseq->number);
  osip_free(cseq);
}

int osip_cseq_clone(const osip_cseq_t *cseq, osip_cseq_t **dest) {
  int i;
  osip_cseq_t *cs;

  *dest = NULL;

  if (cseq == NULL)
    return OSIP_BADPARAMETER;

  if (cseq->method == NULL)
    return OSIP_BADPARAMETER;

  if (cseq->number == NULL)
    return OSIP_BADPARAMETER;

  i = osip_cseq_init(&cs);

  if (i != 0) {
    osip_cseq_free(cs);
    return i;
  }

  cs->method = osip_strdup(cseq->method);
  cs->number = osip_strdup(cseq->number);

  *dest = cs;
  return OSIP_SUCCESS;
}

int osip_cseq_match(osip_cseq_t *cseq1, osip_cseq_t *cseq2) {
  if (cseq1 == NULL || cseq2 == NULL)
    return OSIP_BADPARAMETER;

  if (cseq1->number == NULL || cseq2->number == NULL || cseq1->method == NULL || cseq2->method == NULL)
    return OSIP_BADPARAMETER;

  if (0 == strcmp(cseq1->number, cseq2->number)) {
    if (0 == strcmp(cseq2->method, "INVITE") || 0 == strcmp(cseq2->method, "ACK")) {
      if (0 == strcmp(cseq1->method, "INVITE") || 0 == strcmp(cseq1->method, "ACK"))
        return OSIP_SUCCESS;

    } else {
      if (0 == strcmp(cseq1->method, cseq2->method))
        return OSIP_SUCCESS;
    }
  }

  return OSIP_UNDEFINED_ERROR;
}