sip_extra.c

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

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

/**@SIP_HEADER sip_priority Priority Header
 * 
 * The Priority request-header field indicates the urgency of the request as
 * perceived by the client. Its syntax is defined in @RFC3261 as follows:
 * 
 * @code
 *    Priority        =  "Priority" HCOLON priority-value
 *    priority-value  =  "emergency" / "urgent" / "normal"
 *                       / "non-urgent" / other-priority
 *    other-priority  =  token
 * @endcode
 * 
 *
 * The parsed Priority header is stored in #sip_priority_t structure.
 */

/**@ingroup sip_priority
 * @typedef struct msg_generic_s sip_priority_t; 
 *
 * The structure #sip_priority_t contains representation of a SIP 
 * @Priority header.
 *
 * The #sip_priority_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Dummy link to next header
 *   char const    *g_string;	    // Priority token
 * } sip_priority_t;
 * @endcode
 */

msg_hclass_t sip_priority_class[] = 
SIP_HEADER_CLASS_G(priority, "Priority", "", single);

issize_t sip_priority_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_priority_t *priority = (sip_priority_t *)h;
  
  if (msg_token_d(&s, &priority->g_string) < 0)
    return -1;

  if (*s && !IS_LWS(*s))	/* Something extra after priority token? */
    return -1;

  return 0;
}

issize_t sip_priority_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_priority_p(h));
  return sip_generic_e(b, bsiz, h, f);
}

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

/**@SIP_HEADER sip_server Server Header
 * 
 * The Server response-header field contains information about the software
 * used by the user agent server to handle the request. Its syntax is
 * defined in @RFC2616 section 14.38 and @RFC3261 as follows:
 * 
 * @code
 *    Server           =  "Server" HCOLON server-val *(LWS server-val)
 *    server-val       =  product / comment
 *    product          =  token [SLASH product-version]
 *    product-version  =  token
 * @endcode
 *
 * The parsed Server header is stored in #sip_server_t structure.
 */

/**@ingroup sip_server
 * @typedef struct msg_generic_s sip_server_t; 
 *
 * The structure #sip_server_t contains representation of a SIP 
 * @Server header.
 *
 * The #sip_server_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Link to next header
 *   char const    *g_string;	    // Server tokens
 * } sip_server_t;
 * @endcode
 */

msg_hclass_t sip_server_class[] = 
SIP_HEADER_CLASS_G(server, "Server", "", single);

issize_t sip_server_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  return sip_generic_d(home, h, s, slen);
}

issize_t sip_server_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_server_p(h));
  return sip_generic_e(b, bsiz, h, f);
}

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

/**@SIP_HEADER sip_subject Subject Header
 * 
 * The Subject header provides a summary or indicates the nature of the
 * request. Its syntax is defined in @RFC3261 as follows:
 * 
 * @code
 *    Subject  =  ( "Subject" / "s" ) HCOLON [TEXT-UTF8-TRIM]
 * @endcode
 * 
 * The parsed Subject header is stored in #sip_subject_t structure.
 */

/**@ingroup sip_subject
 * @typedef struct msg_generic_s sip_subject_t; 
 *
 * The structure #sip_subject_t contains representation of a SIP 
 * @Subject header.
 *
 * The #sip_subject_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Link to next header
 *   char const    *g_string;	    // Subject text
 * } sip_subject_t;
 * @endcode
 */

msg_hclass_t sip_subject_class[] = 
SIP_HEADER_CLASS_G(subject, "Subject", "s", single);

issize_t sip_subject_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  return sip_generic_d(home, h, s, slen);
}

issize_t sip_subject_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_subject_p(h));
  return sip_generic_e(b, bsiz, h, f);
}

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

/**@SIP_HEADER sip_timestamp Timestamp Header
 * 
 * The @b Timestamp header describes when the client sent the request to the
 * server, and it is used by the client to adjust its retransmission
 * intervals. Its syntax is defined in @RFC3261 as follows:
 * 
 * @code
 *    Timestamp  =  "Timestamp" HCOLON 1*(DIGIT)
 *                   [ "." *(DIGIT) ] [ LWS delay ]
 *    delay      =  *(DIGIT) [ "." *(DIGIT) ]
 * @endcode
 * 
 * The parsed Timestamp header is stored in #sip_timestamp_t structure.
 */

/**@ingroup sip_timestamp
 * @typedef struct sip_timestamp_s sip_timestamp_t; 
 *
 * The structure #sip_timestamp_t contains representation of a SIP 
 * @Timestamp header.
 *
 * The #sip_timestamp_t is defined as follows:
 * @code
 * typedef struct sip_timestamp_s
 * {
 *   sip_common_t        ts_common[1]; // Common fragment info
 *   sip_error_t        *ts_next;      // Dummy link
 *   char const         *ts_stamp;     // Original timestamp
 *   char const         *ts_delay;     // Delay at UAS
 * } sip_timestamp_t;
 * @endcode
 */

static isize_t sip_timestamp_dup_xtra(sip_header_t const *h, isize_t offset);
static char *sip_timestamp_dup_one(sip_header_t *dst,
				   sip_header_t const *src,
				   char *b,
				   isize_t xtra);
#define sip_timestamp_update NULL

msg_hclass_t sip_timestamp_class[] = 
SIP_HEADER_CLASS(timestamp, "Timestamp", "", ts_common, single,
		 timestamp);

issize_t sip_timestamp_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_timestamp_t *ts = (sip_timestamp_t*)h;

  ts->ts_stamp = s;
  s += span_digit(s); 
  if (s == ts->ts_stamp)
    return -1;
  if (*s == '.') { s += span_digit(s + 1) + 1; }

  if (IS_LWS(*s)) {
    *s = '\0';
    s += span_lws(s + 1) + 1;
    ts->ts_delay = s;
    s += span_digit(s); if (*s == '.') { s += span_digit(s + 1) + 1; }
  }

  if (!*s || IS_LWS(*s))
    *s++ = '\0';
  else
    return -1;
  
  return 0;
}

issize_t sip_timestamp_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  sip_timestamp_t const *ts = h->sh_timestamp;
  char *end = b + bsiz, *b0 = b;

  assert(sip_timestamp_p(h));

  MSG_STRING_E(b, end, ts->ts_stamp);
  if (ts->ts_delay) {
    MSG_CHAR_E(b, end, ' ');
    MSG_STRING_E(b, end, ts->ts_delay);
  }

  MSG_TERM_E(b, end);
    
  return b - b0;
}

static
isize_t sip_timestamp_dup_xtra(sip_header_t const *h, isize_t offset)
{
  sip_timestamp_t const *ts = h->sh_timestamp;

  offset += MSG_STRING_SIZE(ts->ts_stamp);
  offset += MSG_STRING_SIZE(ts->ts_delay);

  return offset;
}

static
char *sip_timestamp_dup_one(sip_header_t *dst,
			    sip_header_t const *src,
			    char *b,
			    isize_t xtra)
{
  sip_timestamp_t *ts = dst->sh_timestamp;
  sip_timestamp_t const *o = src->sh_timestamp;
  char *end = b + xtra;

  MSG_STRING_DUP(b, ts->ts_stamp, o->ts_stamp);
  MSG_STRING_DUP(b, ts->ts_delay, o->ts_delay);

  assert(b <= end); (void)end;

  return b;
}

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

/**@SIP_HEADER sip_user_agent User-Agent Header
 * 
 * The User-Agent header contains information about the client user agent
 * originating the request. Its syntax is defined in [H14.43, S10.45] as
 * follows:
 * 
 * @code
 *    User-Agent       =  "User-Agent" HCOLON server-val *(LWS server-val)
 *    server-val       =  product / comment
 *    product          =  token [SLASH product-version]
 *    product-version  =  token
 * @endcode
 * 
 * The parsed User-Agent header is stored in #sip_user_agent_t structure.
 */

/**@ingroup sip_user_agent
 * @typedef struct msg_generic_s sip_user_agent_t; 
 *
 * The structure #sip_user_agent_t contains representation of a SIP 
 * @UserAgent header.
 *
 * The #sip_user_agent_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Link to next header
 *   char const    *g_string;	    // User-Agent components
 * } sip_user_agent_t;
 * @endcode
 */

msg_hclass_t sip_user_agent_class[] = 
SIP_HEADER_CLASS_G(user_agent, "User-Agent", "", single);

issize_t sip_user_agent_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  return sip_generic_d(home, h, s, slen);
}

issize_t sip_user_agent_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  assert(sip_user_agent_p(h));
  return sip_generic_e(b, bsiz, h, f);
}

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

/**@SIP_HEADER sip_etag SIP-ETag Header
 * 
 * The @b SIP-ETag header field identifies the published event state. Its
 * syntax is defined in @RFC3903 as follows:
 * 
 * @code
 *      SIP-ETag           = "SIP-ETag" HCOLON entity-tag
 *      entity-tag         = token
 * @endcode
 *
 * The parsed SIP-ETag header is stored in #sip_etag_t structure.
 */

/**@ingroup sip_etag
 * @typedef struct msg_generic_s sip_etag_t; 
 *
 * The structure #sip_etag_t contains representation of a SIP 
 * @SIPETag header.
 *
 * The #sip_etag_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Link to next header
 *   char const    *g_string;	    // entity-tag
 * } sip_etag_t;
 * @endcode
 */

msg_hclass_t sip_etag_class[] = 
SIP_HEADER_CLASS_G(etag, "SIP-ETag", "", single);

issize_t sip_etag_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_etag_t *etag = (sip_etag_t *)h;

  return msg_token_d(&s, &etag->g_value);
}

issize_t sip_etag_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  return msg_generic_e(b, bsiz, h, f);
}

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

/**@SIP_HEADER sip_if_match SIP-If-Match Header
 * 
 * The @b SIP-If-Match header field identifies the specific entity of event
 * state that the request is refreshing, modifying or removing. Its syntax
 * is defined in @RFC3903 as follows:
 * 
 * @code
 *      SIP-If-Match       = "SIP-If-Match" HCOLON entity-tag
 *      entity-tag         = token
 * @endcode
 *
 * The parsed SIP-If-Match header is stored in #sip_if_match_t structure.
 */

/**@ingroup sip_if_match
 * @typedef struct msg_generic_s sip_if_match_t; 
 *
 * The structure #sip_if_match_t contains representation of a SIP 
 * @SIPIfMatch header.
 *
 * The #sip_if_match_t is defined as follows:
 * @code
 * typedef struct msg_generic_s
 * {
 *   msg_common_t   g_common[1];    // Common fragment info
 *   msg_generic_t *g_next;	    // Link to next header
 *   char const    *g_string;	    // entity-tag
 * } sip_if_match_t;
 * @endcode
 */

msg_hclass_t sip_if_match_class[] = 
SIP_HEADER_CLASS_G(if_match, "SIP-If-Match", "", single);

issize_t sip_if_match_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  return sip_etag_d(home, h, s, slen);
}

issize_t sip_if_match_e(char b[], isize_t bsiz, sip_header_t const *h, int f)
{
  return sip_etag_e(b, bsiz, h, f);
}

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

/** Parsing @CallInfo, @ErrorInfo. */
static
issize_t sip_info_d(su_home_t *home, sip_header_t *h, char *s, isize_t slen)
{
  sip_call_info_t *ci = h->sh_call_info;
  char *end = s + slen;

  assert(h);

  while (*s == ',')
    s += span_lws(s + 1) + 1;

  if (sip_name_addr_d(home, &s, NULL, ci->ci_url, &ci->ci_params, NULL) < 0)
    return -1;

  /* Recurse */
  return msg_parse_next_field(home, h, s, end - s);
}

isize_t sip_info_dup_xtra(sip_header_t const *h, isize_t offset)
{
  sip_call_info_t const *ci = h->sh_call_info;

  return sip_name_addr_xtra(NULL,
			    ci->ci_url,
			    ci->ci_params,
			    offset);
}

char *sip_info_dup_one(sip_header_t *dst,
		       sip_header_t const *src,
		       char *b,
		       isize_t xtra)
{
  sip_call_info_t *ci = dst->sh_call_info;
  sip_call_info_t const *o = src->sh_call_info;

  return sip_name_addr_dup(NULL, NULL,
			   ci->ci_url, o->ci_url,
			   &ci->ci_params, o->ci_params,
			   b, xtra);
}

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

#if SU_HAVE_EXPERIMENTAL

/**@SIP_HEADER sip_suppress_body_if_match Suppress-Body-If-Match Header
 *
 * The @b Suppress-Body-If-Match header field identifies a SIP event content
 * already known by the watcher. Its syntax is defined in
 * draft-niemi-sip-subnot-etags-01 as follows:
 *
 * @code
 *    Suppress-Body-If-Match = "Suppress-Body-If-Match" HCOLON entity-tag
 *    entity-tag             = token