sip_feature.c

Sofia SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.

/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2005 Nokia Corporation.
 *
 * Contact: Pekka Pessi <[e-mail]>
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

/**@CFILE sip_feature.c 
 *
 * @brief Feature-related SIP header handling
 *
 * @author Pekka Pessi <[e-mail]>.
 *
 * @date Created: Tue Jun 13 02:57:51 2000 ppessi
 */

#include "config.h"

/* Avoid casting sip_t to msg_pub_t and sip_header_t to msg_header_t */
#define MSG_PUB_T       struct sip_s
#define MSG_HDR_T       union sip_header_u

#include "sofia-sip/sip_parser.h"

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

/* ====================================================================== */

/**@SIP_HEADER sip_allow Allow Header
 *
 * The Allow header lists the set of methods supported by the user agent
 * generating the message.  Its syntax is defined in @RFC3261 as
 * follows:
 * 
 * @code
 *    Allow  =  "Allow" HCOLON [Method *(COMMA Method)]
 * @endcode
 *
 * The parsed Allow header is stored in #sip_allow_t structure.
 *
 * Note that SIP methods are case-sensitive: "INVITE" method is different from
 * "Invite".
 *
 * @sa msg_header_find_item(), msg_header_replace_item(),
 * msg_header_remove_item()
 */

/**@ingroup sip_allow
 * @typedef struct msg_list_s sip_allow_t; 
 *
 * The structure #sip_allow_t contains representation of an @Allow header.
 *
 * The #sip_allow_t is defined as follows:
 * @code
 * typedef struct msg_allow_s
 * {
 *   msg_common_t       k_common[1];  // Common fragment info
 *   msg_list_t        *k_next;	      // Link to next header
 *   msg_param_t       *k_items;      // List of items
 *   uint32_t           k_bitmap;     // Bitmap of allowed methods
 * } sip_allow_t;
 * @endcode
 *
 * @note The field @a k_bitmap was added in @VERSION_1_12_5.
 */

#define sip_allow_dup_xtra msg_list_dup_xtra
#define sip_allow_dup_one  msg_list_dup_one
static msg_update_f sip_allow_update;

msg_hclass_t sip_allow_class[] = 
SIP_HEADER_CLASS(allow, "Allow", "", k_items, list, allow);

issize_t sip_allow_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_allow_t *k = (sip_allow_t *)h;
  issize_t retval = msg_commalist_d(home, &s, &k->k_items, msg_token_scan);
  msg_header_update_params(k->k_common, 0);
  return retval;
}

issize_t sip_allow_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_is_allow(h));
  return msg_list_e(b, bsiz, h, f);
}

static int sip_allow_update(msg_common_t *h, 
			  char const *name, isize_t namelen,
			  char const *value)
{
  sip_allow_t *k = (sip_allow_t *)h;

  if (name == NULL) {
    k->k_bitmap = 0;
  }
  else {
    sip_method_t method = sip_method_code(name);

    if (method >= 0 && method < 32) 
      k->k_bitmap |= 1 << method;
  }

  return 0;
}

/** Return true if the method is listed in @Allow header. */
int sip_is_allowed(sip_allow_t const *allow,
		   sip_method_t method,
		   char const *name)
{
  if (method < sip_method_unknown || !allow)
    return 0;

  if (sip_method_unknown < method && method < 32)
    /* Well-known method */
    return (allow->k_bitmap & (1 << method)) != 0;

  if (method == sip_method_unknown &&
      (allow->k_bitmap & (1 << sip_method_unknown)) == 0)
    return 0;

  return msg_header_find_item(allow->k_common, name) != NULL;
}


/* ====================================================================== */

/**@SIP_HEADER sip_proxy_require Proxy-Require Header
 *
 * The Proxy-Require header is used to indicate proxy-sensitive features
 * that @b MUST be supported by the proxy.  Its syntax is defined in @RFC3261
 * as follows:
 * 
 * @code
 *    Proxy-Require  =  "Proxy-Require" HCOLON option-tag *(COMMA option-tag)
 * @endcode
 *
 *
 * The parsed Proxy-Require header is stored in #sip_proxy_require_t structure.
 */

/**@ingroup sip_proxy_require
 * @typedef struct msg_list_s sip_proxy_require_t; 
 *
 * The structure #sip_proxy_require_t contains representation of an 
 * @ProxyRequire header.
 *
 * The #sip_proxy_require_t is defined as follows:
 * @code
 * typedef struct msg_list_s
 * {
 *   msg_common_t       k_common[1];  // Common fragment info
 *   msg_list_t        *k_next;	      // Dummy link
 *   msg_param_t       *k_items;      // List of items
 * } sip_proxy_require_t;
 * @endcode
 */

msg_hclass_t sip_proxy_require_class[] = 
SIP_HEADER_CLASS_LIST(proxy_require, "Proxy-Require", "", list);

issize_t sip_proxy_require_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_proxy_require_t *k = (sip_proxy_require_t *)h;
  return msg_commalist_d(home, &s, &k->k_items, msg_token_scan);
}

issize_t sip_proxy_require_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_is_proxy_require(h));
  return msg_list_e(b, bsiz, h, f);
}

/* ====================================================================== */

/**@SIP_HEADER sip_require Require Header
 *
 * The Require header is used by clients to tell user agent servers about
 * options that the client expects the server to support in order to
 * properly process the request.  Its syntax is defined in @RFC3261 
 * as follows:
 * 
 * @code
 *    Require       =  "Require" HCOLON option-tag *(COMMA option-tag)
 * @endcode
 *
 * The parsed Require header is stored in #sip_require_t structure.
 */

/**@ingroup sip_require
 * @typedef struct msg_list_s sip_require_t; 
 *
 * The structure #sip_require_t contains representation of an 
 * @Require header.
 *
 * The #sip_require_t is defined as follows:
 * @code
 * typedef struct msg_list_s
 * {
 *   msg_common_t       k_common[1];  // Common fragment info
 *   msg_list_t        *k_next;	      // Link to next header
 *   msg_param_t       *k_items;      // List of items
 * } sip_require_t;
 * @endcode
 */

msg_hclass_t sip_require_class[] = 
SIP_HEADER_CLASS_LIST(require, "Require", "", list);

issize_t sip_require_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_require_t *k = (sip_require_t *)h;
  return msg_commalist_d(home, &s, &k->k_items, msg_token_scan);
}

issize_t sip_require_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_is_require(h));
  return msg_list_e(b, bsiz, h, f);
}

/* ====================================================================== */

/**@SIP_HEADER sip_supported Supported Header
 *
 * The Supported header enumerates all the capabilities of the client or
 * server.  Its syntax is defined in @RFC3261 as follows:
 * 
 * @code
 *    Supported  =  ( "Supported" / "k" ) HCOLON
 *                  [option-tag *(COMMA option-tag)]
 * @endcode
 *
 * The parsed option-tags of Supported header
 * are stored in #sip_supported_t structure.
 */

/**@ingroup sip_supported
 * @typedef struct msg_list_s sip_supported_t; 
 *
 * The structure #sip_supported_t contains representation of an 
 * @Supported header.
 *
 * The #sip_supported_t is defined as follows:
 * @code
 * typedef struct msg_list_s
 * {
 *   msg_common_t       k_common[1];  // Common fragment info
 *   msg_list_t        *k_next;	      // Link to next header
 *   msg_param_t       *k_items;      // List of items
 * } sip_supported_t;
 * @endcode
 */


msg_hclass_t sip_supported_class[] = 
SIP_HEADER_CLASS_LIST(supported, "Supported", "k", list);

issize_t sip_supported_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_supported_t *k = (sip_supported_t *)h;
  return msg_commalist_d(home, &s, &k->k_items, msg_token_scan);
}

issize_t sip_supported_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_is_supported(h));
  return msg_list_e(b, bsiz, h, f);
}

/* ====================================================================== */

/**@SIP_HEADER sip_unsupported Unsupported Header
 *
 * The Unsupported header lists the features not supported by the server.
 * Its syntax is defined in @RFC3261 as follows:
 *