inline int rtsp_media_aggregate_control_enable(void *sdp)
{
const char* control;
// rfc 2326 C.1.1 Control URL (p80)
// If found at the session level, the attribute indicates the URL for aggregate control
control = sdp_attribute_find(sdp, "control");
return (control && *control) ? 1 : 0;
}
// rfc 2326 C.1.1 Control URL (p81)
// look for a base URL in the following order:
// 1. The RTSP Content-Base field
// 2. The RTSP Content-Location field
// 3. The RTSP request URL
static int rtsp_get_session_uri(void *sdp, char* uri, size_t bytes, const char* requri, const char* baseuri, const char* location)
{
char path[256] = {0};
const char* control;
// C.1.1 Control URL (p81)
// If this attribute contains only an asterisk (*), then the URL is
// treated as if it were an empty embedded URL, and thus inherits the entire base URL.
control = sdp_attribute_find(sdp, "control");
if(!control || 0==*control || '*' == *control)
control = "";
strncpy(uri, control, bytes-1);
if(!isAbsoluteURL(uri) && baseuri && *baseuri)
{
if(*uri)
{
uri_join(path, sizeof(path), baseuri, uri);
baseuri = path;
}
strncpy(uri, baseuri, bytes-1);
}
if(!isAbsoluteURL(uri) && location && *location)
{
if(*uri)
{
uri_join(path, sizeof(path), location, uri);
location = path;
}
strncpy(uri, location, bytes-1);
}
if(!isAbsoluteURL(uri) && requri && *requri)
{
if(*uri)
{
uri_join(path, sizeof(path), requri, uri);
requri = path;
}
strncpy(uri, requri, bytes-1);
}
return 0;
}
/** Find a mapped attribute.
*
* A mapped attribute has form 'a=<name>:<pt> <value>' where pt is a RTP
* payload type, integer in range 0..127. For example, "a=atmmap" [@RFC3108]
* is a mapped attribute. Note that common mapped attributes, "a=rtpmap" and
* "a=fmtp" are already parsed as list of #sdp_rtpmap_t in #sdp_media_t.
*
* @param a pointer to first attribute in the list
* @param name name of the attribute
* @param pt payload type number (must be 0..127)
* @param return_result return value parameter for mapped attribute value
*
* @return Pointer to a matching attribute structure, or NULL.
*
* If a matching attribute is found, @a return_result will point to part of
* the attribute after the payload type and whitespace.
*/
sdp_attribute_t *sdp_attribute_mapped_find(sdp_attribute_t const *a,
char const *name,
int pt, char **return_result)
{
char pt_value[4];
size_t pt_len;
if (return_result)
*return_result = NULL;
if (0 > pt || pt > 127)
return NULL;
snprintf(pt_value, sizeof(pt_value), "%u", (unsigned)pt);
pt_len = strlen(pt_value);
for (; (a = sdp_attribute_find(a, name)); a = a->a_next) {
char const *value = a->a_value;
size_t wlen;
if (strncmp(value, pt_value, pt_len))
continue;
wlen = strspn(value + pt_len, " \t");
if (wlen == 0 || value[pt_len + wlen] == '\0')
continue;
if (return_result)
*return_result = (char *)value + pt_len + wlen;
return (sdp_attribute_t *)a;
}
return NULL;
}
char *janus_sdp_anonymize(const char *sdp) {
if(sdp == NULL)
return NULL;
sdp_session_t *anon = NULL;
sdp_parser_t *parser = sdp_parse(home, sdp, strlen(sdp), 0);
if(!(anon = sdp_session(parser))) {
JANUS_LOG(LOG_ERR, "Error parsing/merging SDP: %s\n", sdp_parsing_error(parser));
sdp_parser_free(parser);
return NULL;
}
/* c= */
if(anon->sdp_connection && anon->sdp_connection->c_address) {
anon->sdp_connection->c_address = "1.1.1.1";
}
/* a= */
if(anon->sdp_attributes) {
/* These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(anon->sdp_attributes, "ice-ufrag"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-ufrag");
while(sdp_attribute_find(anon->sdp_attributes, "ice-pwd"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-pwd");
while(sdp_attribute_find(anon->sdp_attributes, "ice-options"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-options");
while(sdp_attribute_find(anon->sdp_attributes, "fingerprint"))
sdp_attribute_remove(&anon->sdp_attributes, "fingerprint");
while(sdp_attribute_find(anon->sdp_attributes, "group"))
sdp_attribute_remove(&anon->sdp_attributes, "group");
while(sdp_attribute_find(anon->sdp_attributes, "msid-semantic"))
sdp_attribute_remove(&anon->sdp_attributes, "msid-semantic");
}
/* m= */
if(anon->sdp_media) {
int audio = 0, video = 0;
#ifdef HAVE_SCTP
int data = 0;
#endif
sdp_media_t *m = anon->sdp_media;
while(m) {
if(m->m_type == sdp_media_audio && m->m_port > 0) {
audio++;
m->m_port = audio == 1 ? 1 : 0;
} else if(m->m_type == sdp_media_video && m->m_port > 0) {
video++;
m->m_port = video == 1 ? 1 : 0;
#ifdef HAVE_SCTP
} else if(m->m_type == sdp_media_application) {
if(m->m_proto_name != NULL && !strcasecmp(m->m_proto_name, "DTLS/SCTP") && m->m_port != 0) {
data++;
m->m_port = data == 1 ? 1 : 0;
} else {
m->m_port = 0;
}
#endif
} else {
m->m_port = 0;
}
/* c= */
if(m->m_connections) {
sdp_connection_t *c = m->m_connections;
while(c) {
if(c->c_address) {
c->c_address = "1.1.1.1";
}
c = c->c_next;
}
}
/* a= */
if(m->m_attributes) {
/* These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(m->m_attributes, "ice-ufrag"))
sdp_attribute_remove(&m->m_attributes, "ice-ufrag");
while(sdp_attribute_find(m->m_attributes, "ice-pwd"))
sdp_attribute_remove(&m->m_attributes, "ice-pwd");
while(sdp_attribute_find(m->m_attributes, "ice-options"))
sdp_attribute_remove(&m->m_attributes, "ice-options");
while(sdp_attribute_find(m->m_attributes, "crypto"))
sdp_attribute_remove(&m->m_attributes, "crypto");
while(sdp_attribute_find(m->m_attributes, "fingerprint"))
sdp_attribute_remove(&m->m_attributes, "fingerprint");
while(sdp_attribute_find(m->m_attributes, "setup"))
sdp_attribute_remove(&m->m_attributes, "setup");
while(sdp_attribute_find(m->m_attributes, "connection"))
sdp_attribute_remove(&m->m_attributes, "connection");
while(sdp_attribute_find(m->m_attributes, "group"))
sdp_attribute_remove(&m->m_attributes, "group");
while(sdp_attribute_find(m->m_attributes, "mid"))
sdp_attribute_remove(&m->m_attributes, "mid");
while(sdp_attribute_find(m->m_attributes, "msid"))
sdp_attribute_remove(&m->m_attributes, "msid");
while(sdp_attribute_find(m->m_attributes, "msid-semantic"))
sdp_attribute_remove(&m->m_attributes, "msid-semantic");
while(sdp_attribute_find(m->m_attributes, "rtcp"))
sdp_attribute_remove(&m->m_attributes, "rtcp");
while(sdp_attribute_find(m->m_attributes, "rtcp-mux"))
sdp_attribute_remove(&m->m_attributes, "rtcp-mux");
while(sdp_attribute_find(m->m_attributes, "candidate"))
sdp_attribute_remove(&m->m_attributes, "candidate");
while(sdp_attribute_find(m->m_attributes, "ssrc"))
sdp_attribute_remove(&m->m_attributes, "ssrc");
while(sdp_attribute_find(m->m_attributes, "ssrc-group"))
sdp_attribute_remove(&m->m_attributes, "ssrc-group");
while(sdp_attribute_find(m->m_attributes, "extmap")) /* TODO Actually implement RTP extensions */
sdp_attribute_remove(&m->m_attributes, "extmap");
while(sdp_attribute_find(m->m_attributes, "sctpmap"))
sdp_attribute_remove(&m->m_attributes, "sctpmap");
}
if(m->m_type != sdp_media_application && m->m_mode == sdp_sendrecv) {
/* FIXME sendrecv hack: sofia-sdp doesn't print sendrecv, but we want it to */
sdp_attribute_t *fakedir = calloc(1, sizeof(sdp_attribute_t));
fakedir->a_size = sizeof(sdp_attribute_t);
fakedir->a_name = g_strdup("jfmod");
fakedir->a_value = g_strdup("sr");
sdp_attribute_append(&m->m_attributes, fakedir);
}
m = m->m_next;
}
}
char buf[BUFSIZE];
sdp_printer_t *printer = sdp_print(home, anon, buf, BUFSIZE, 0);
if(sdp_message(printer)) {
int retval = sdp_message_size(printer);
sdp_printer_free(printer);
sdp_parser_free(parser);
/* FIXME Take care of the sendrecv hack, if needed */
char *replace = strstr(buf, "a=jfmod:sr");
while(replace != NULL) {
memcpy(replace, "a=sendrecv", strlen("a=sendrecv"));
replace++;
replace = strstr(replace, "a=jfmod:sr");
}
JANUS_LOG(LOG_VERB, " -------------------------------------------\n");
JANUS_LOG(LOG_VERB, " >> Anonymized (%zu --> %d bytes)\n", strlen(sdp), retval);
JANUS_LOG(LOG_VERB, " -------------------------------------------\n");
JANUS_LOG(LOG_VERB, "%s\n", buf);
return g_strdup(buf);
} else {
JANUS_LOG(LOG_ERR, "Error anonymizing SDP: %s\n", sdp_printing_error(printer));
sdp_printer_free(printer);
sdp_parser_free(parser);
return NULL;
}
}
char *janus_sdp_anonymize(const char *sdp) {
if(sdp == NULL)
return NULL;
//~ su_home_t home[1] = { SU_HOME_INIT(home) };
sdp_session_t *anon = NULL;
sdp_parser_t *parser = sdp_parse(home, sdp, strlen(sdp), 0);
if(!(anon = sdp_session(parser))) {
JANUS_DEBUG("Error parsing/merging SDP: %s\n", sdp_parsing_error(parser));
return NULL;
}
//~ /* o= */
//~ if(anon->sdp_origin && anon->sdp_origin->o_username) {
//~ free(anon->sdp_origin->o_username);
//~ anon->sdp_origin->o_username = strdup("JANUS");
//~ }
/* c= */
if(anon->sdp_connection && anon->sdp_connection->c_address) {
//~ free(anon->sdp_connection->c_address);
anon->sdp_connection->c_address = strdup("1.1.1.1");
}
/* a= */
if(anon->sdp_attributes) {
/* FIXME These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(anon->sdp_attributes, "ice-ufrag"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-ufrag");
while(sdp_attribute_find(anon->sdp_attributes, "ice-pwd"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-pwd");
while(sdp_attribute_find(anon->sdp_attributes, "ice-options"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-options");
while(sdp_attribute_find(anon->sdp_attributes, "fingerprint"))
sdp_attribute_remove(&anon->sdp_attributes, "fingerprint");
while(sdp_attribute_find(anon->sdp_attributes, "group"))
sdp_attribute_remove(&anon->sdp_attributes, "group");
while(sdp_attribute_find(anon->sdp_attributes, "msid-semantic"))
sdp_attribute_remove(&anon->sdp_attributes, "msid-semantic");
}
/* m= */
int a_sendrecv = 0, v_sendrecv = 0;
if(anon->sdp_media) {
int audio = 0, video = 0;
sdp_media_t *m = anon->sdp_media;
while(m) {
if(m->m_type == sdp_media_audio) {
audio++;
m->m_port = audio == 1 ? 1 : 0;
} else if(m->m_type == sdp_media_video) {
video++;
m->m_port = audio == 1 ? 1 : 0;
} else {
m->m_port = 0;
}
/* c= */
if(m->m_connections) {
sdp_connection_t *c = m->m_connections;
while(c) {
if(c->c_address) {
//~ free(c->c_address);
c->c_address = strdup("1.1.1.1");
}
c = c->c_next;
}
}
/* a= */
if(m->m_attributes) {
/* FIXME These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(m->m_attributes, "ice-ufrag"))
sdp_attribute_remove(&m->m_attributes, "ice-ufrag");
while(sdp_attribute_find(m->m_attributes, "ice-pwd"))
sdp_attribute_remove(&m->m_attributes, "ice-pwd");
while(sdp_attribute_find(m->m_attributes, "ice-options"))
sdp_attribute_remove(&m->m_attributes, "ice-options");
while(sdp_attribute_find(m->m_attributes, "crypto"))
sdp_attribute_remove(&m->m_attributes, "crypto");
while(sdp_attribute_find(m->m_attributes, "fingerprint"))
sdp_attribute_remove(&m->m_attributes, "fingerprint");
while(sdp_attribute_find(m->m_attributes, "setup"))
sdp_attribute_remove(&m->m_attributes, "setup");
while(sdp_attribute_find(m->m_attributes, "connection"))
sdp_attribute_remove(&m->m_attributes, "connection");
while(sdp_attribute_find(m->m_attributes, "group"))
sdp_attribute_remove(&m->m_attributes, "group");
while(sdp_attribute_find(m->m_attributes, "msid-semantic"))
sdp_attribute_remove(&m->m_attributes, "msid-semantic");
while(sdp_attribute_find(m->m_attributes, "rtcp"))
sdp_attribute_remove(&m->m_attributes, "rtcp");
while(sdp_attribute_find(m->m_attributes, "rtcp-mux"))
sdp_attribute_remove(&m->m_attributes, "rtcp-mux");
while(sdp_attribute_find(m->m_attributes, "candidate"))
sdp_attribute_remove(&m->m_attributes, "candidate");
while(sdp_attribute_find(m->m_attributes, "ssrc"))
sdp_attribute_remove(&m->m_attributes, "ssrc");
while(sdp_attribute_find(m->m_attributes, "extmap")) /* TODO Actually implement RTP extensions */
sdp_attribute_remove(&m->m_attributes, "extmap");
}
/* FIXME sendrecv hack: sofia-sdp doesn't print sendrecv, but we want it to */
if(m->m_mode == sdp_sendrecv) {
m->m_mode = sdp_inactive;
if(m->m_type == sdp_media_audio)
a_sendrecv = 1;
else if(m->m_type == sdp_media_video)
v_sendrecv = 1;
}
m = m->m_next;
}
}
char buf[BUFSIZE];
sdp_printer_t *printer = sdp_print(home, anon, buf, BUFSIZE, 0);
if(sdp_message(printer)) {
int retval = sdp_message_size(printer);
sdp_printer_free(printer);
/* FIXME Take care of the sendrecv hack */
if(a_sendrecv || v_sendrecv) {
char *replace = strstr(buf, "a=inactive");
while(replace != NULL) {
memcpy(replace, "a=sendrecv", strlen("a=sendrecv"));
replace++;
replace = strstr(replace, "a=inactive");
}
}
JANUS_PRINT(" -------------------------------------------\n");
JANUS_PRINT(" >> Anonymized (%zu --> %d bytes)\n", strlen(sdp), retval);
JANUS_PRINT(" -------------------------------------------\n");
JANUS_PRINT("%s\n", buf);
return g_strdup(buf);
} else {
JANUS_DEBUG("Error anonymizing SDP: %s\n", sdp_printing_error(printer));
return NULL;
}
}
