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sdp.cpp 20.83 KiB
/*
* Copyright (C) 2009 Savoir-Faire Linux inc.
*
* Author: Emmanuel Milou <emmanuel.milou@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "sdp.h"
#include "global.h"
#include "manager.h"
#define ZRTP_VERSION "1.10"
static const pj_str_t STR_AUDIO = { (char*) "audio", 5};
static const pj_str_t STR_VIDEO = { (char*) "video", 5};
static const pj_str_t STR_IN = { (char*) "IN", 2 };
static const pj_str_t STR_IP4 = { (char*) "IP4", 3};
static const pj_str_t STR_IP6 = { (char*) "IP6", 3};
static const pj_str_t STR_RTP_AVP = { (char*) "RTP/AVP", 7 };
static const pj_str_t STR_SDP_NAME = { (char*) "sflphone", 8 };
static const pj_str_t STR_SENDRECV = { (char*) "sendrecv", 8 };
static const pj_str_t STR_RTPMAP = { (char*) "rtpmap", 6 };
static const pj_str_t STR_CRYPTO = { (char*) "crypto", 6 };
Sdp::Sdp (pj_pool_t *pool)
: _local_media_cap()
, _session_media (0)
, _negociator (NULL)
, _ip_addr ("")
, _local_offer (NULL)
, _negociated_offer (NULL)
, _pool (NULL)
, _local_extern_audio_port (0)
{
_pool = pool;
}
Sdp::~Sdp()
{
//unsigned int k;
/*
for( k=0; k<_session_media.size(); k++ ){
delete _session_media[k];
_session_media[k] = 0;
}*/
//for( k=0; k<_local_media_cap.size(); k++ ){
// delete _local_media_cap[k];
//_local_media_cap[k] = 0;
//}
}
void Sdp::set_media_descriptor_line (sdpMedia *media, pjmedia_sdp_media** p_med)
{
pjmedia_sdp_media* med;
pjmedia_sdp_rtpmap rtpmap;
pjmedia_sdp_attr *attr;
AudioCodec *codec;
int count, i;
std::string tmp;
med = PJ_POOL_ZALLOC_T (_pool, pjmedia_sdp_media);
// Get the right media format
pj_strdup (_pool, &med->desc.media,
(media->get_media_type() == MIME_TYPE_AUDIO) ? &STR_AUDIO : &STR_VIDEO);
med->desc.port_count = 1;
med->desc.port = media->get_port();
pj_strdup (_pool, &med->desc.transport, &STR_RTP_AVP);
// Media format ( RTP payload )
count = media->get_media_codec_list().size();
med->desc.fmt_count = count;
// add the payload list
for (i=0; i<count; i++) {
codec = media->get_media_codec_list() [i];
tmp = this->convert_int_to_string (codec->getPayload ());
_debug ("%s", tmp.c_str());
pj_strdup2 (_pool, &med->desc.fmt[i], tmp.c_str());
// Add a rtpmap field for each codec
// We could add one only for dynamic payloads because the codecs with static RTP payloads
// are entirely defined in the RFC 3351, but if we want to add other attributes like an asymmetric
// connection, the rtpmap attribute will be useful to specify for which codec it is applicable
rtpmap.pt = med->desc.fmt[i];
rtpmap.enc_name = pj_str ( (char*) codec->getCodecName().c_str());
rtpmap.clock_rate = codec->getClockRate();
// Add the channel number only if different from 1
if (codec->getChannel() > 1)
rtpmap.param = pj_str ( (char*) codec->getChannel());
else
rtpmap.param.slen = 0;
pjmedia_sdp_rtpmap_to_attr (_pool, &rtpmap, &attr);
med->attr[med->attr_count++] = attr;
}
// Add the direction stream
attr = (pjmedia_sdp_attr*) pj_pool_zalloc (_pool, sizeof (pjmedia_sdp_attr));
pj_strdup2 (_pool, &attr->name, media->get_stream_direction_str().c_str());
med->attr[ med->attr_count++] = attr;
if (!_zrtp_hello_hash.empty()) {
try {
sdp_add_zrtp_attribute (med,_zrtp_hello_hash);
} catch (...) {
throw;
}
} else {
_debug ("No hash specified");
}
*p_med = med;
}
int Sdp::create_local_offer ()
{
pj_status_t status;
_debug ("Create local offer");
// Build local media capabilities
set_local_media_capabilities ();
// Reference: RFC 4566 [5]
/* Create and initialize basic SDP session */
this->_local_offer = PJ_POOL_ZALLOC_T (_pool, pjmedia_sdp_session);
this->_local_offer->conn = PJ_POOL_ZALLOC_T (_pool, pjmedia_sdp_conn);
/* Initialize the fields of the struct */
sdp_add_protocol();
sdp_add_origin();
sdp_add_session_name();
sdp_add_connection_info();
sdp_add_timing();
//sdp_addAttributes( _pool );
sdp_add_media_description();
if(!_srtp_crypto.empty()) {
sdp_add_sdes_attribute(_srtp_crypto);
}
//toString ();
// Validate the sdp session
status = pjmedia_sdp_validate (this->_local_offer);
if (status != PJ_SUCCESS)
return status;
return PJ_SUCCESS;
}
int Sdp::create_initial_offer()
{
pj_status_t status;
pjmedia_sdp_neg_state state;
_debug ("Create initial offer");
// Build the SDP session descriptor
status = create_local_offer();
if (status != PJ_SUCCESS) {
_debug (" Error: Failled to create initial offer");
return status;
}
// Create the SDP negociator instance with local offer
status = pjmedia_sdp_neg_create_w_local_offer (_pool, get_local_sdp_session(), &_negociator);
if (status != PJ_SUCCESS) {
_debug (" Error: Failled to create an initial SDP negociator");
return status;
}
state = pjmedia_sdp_neg_get_state (_negociator);
PJ_ASSERT_RETURN (status == PJ_SUCCESS, 1);
_debug (" Initial offer created succesfully");
return PJ_SUCCESS;
}
int Sdp::receiving_initial_offer (pjmedia_sdp_session* remote)
{
// Create the SDP negociator instance by calling
// pjmedia_sdp_neg_create_w_remote_offer with the remote offer, and by providing the local offer ( optional )
pj_status_t status;
// Create the SDP negociator instance by calling
// pjmedia_sdp_neg_create_w_remote_offer with the remote offer, and by providing the local offer ( optional )
// Build the local offer to respond
status = create_local_offer();
if (status != PJ_SUCCESS) {
return status;
}
// Retrieve some useful remote information
this->set_media_transport_info_from_remote_sdp (remote);
status = pjmedia_sdp_neg_create_w_remote_offer (_pool,
get_local_sdp_session(), remote, &_negociator);
PJ_ASSERT_RETURN (status == PJ_SUCCESS, 1);
return PJ_SUCCESS;
}
pj_status_t Sdp::check_sdp_answer (pjsip_inv_session *inv, pjsip_rx_data *rdata)
{
static const pj_str_t str_application = { (char*) "application", 11 };
static const pj_str_t str_sdp = { (char*) "sdp", 3 };
pj_status_t status;
pjsip_msg * message = NULL;
pjmedia_sdp_session * remote_sdp = NULL;
if (pjmedia_sdp_neg_get_state (inv->neg) == PJMEDIA_SDP_NEG_STATE_LOCAL_OFFER) {
message = rdata->msg_info.msg;
if (message == NULL) {
_debug ("No message");
return PJMEDIA_SDP_EINSDP;
}
if (message->body == NULL) {
_debug ("Empty message body");
return PJMEDIA_SDP_EINSDP;
}
if (pj_stricmp (&message->body->content_type.type, &str_application) || pj_stricmp (&message->body->content_type.subtype, &str_sdp)) {
_debug ("Incoming Message does not contain SDP");
return PJMEDIA_SDP_EINSDP;
}
// Parse the SDP body.
status = pjmedia_sdp_parse (rdata->tp_info.pool, (char*) message->body->data, message->body->len, &remote_sdp);
if (status == PJ_SUCCESS) {
status = pjmedia_sdp_validate (remote_sdp);
}
if (status != PJ_SUCCESS) {
_debug ("SDP cannot be validated");
return PJMEDIA_SDP_EINSDP;
}
// This is an answer
_debug ("Got SDP answer %s", pjsip_rx_data_get_info (rdata));
status = pjmedia_sdp_neg_set_remote_answer (inv->pool, inv->neg, remote_sdp);
if (status != PJ_SUCCESS) {
_debug ("An error occured while processing remote answer %s", pjsip_rx_data_get_info (rdata)); return PJMEDIA_SDP_EINSDP;
}
// Prefer our codecs to remote when possible
pjmedia_sdp_neg_set_prefer_remote_codec_order (inv->neg, 0);
status = pjmedia_sdp_neg_negotiate (inv->pool, inv->neg, 0);
_debug ("Negotiation returned with status %d PJ_SUCCESS being %d", status, PJ_SUCCESS);
} else {
_debug ("No need to check sdp answer since we are UAS");
return PJ_SUCCESS;
}
return status;
}
void Sdp::sdp_add_protocol (void)
{
this->_local_offer->origin.version = 0;
}
void Sdp::sdp_add_origin (void)
{
pj_time_val tv;
pj_gettimeofday (&tv);
this->_local_offer->origin.user = pj_str (pj_gethostname()->ptr);
// Use Network Time Protocol format timestamp to ensure uniqueness.
this->_local_offer->origin.id = tv.sec + 2208988800UL;
// The type of network ( IN for INternet )
this->_local_offer->origin.net_type = STR_IN;
// The type of address
this->_local_offer->origin.addr_type = STR_IP4;
// The address of the machine from which the session was created
this->_local_offer->origin.addr = pj_str ( (char*) _ip_addr.c_str());
}
void Sdp::sdp_add_session_name (void)
{
this->_local_offer->name = STR_SDP_NAME;
}
void Sdp::sdp_add_connection_info (void)
{
this->_local_offer->conn->net_type = _local_offer->origin.net_type;
this->_local_offer->conn->addr_type = _local_offer->origin.addr_type;
this->_local_offer->conn->addr = _local_offer->origin.addr;
}
void Sdp::sdp_add_timing (void)
{
// RFC 3264: An offer/answer model session description protocol
// As the session is created and destroyed through an external signaling mean (SIP), the line
// should have a value of "0 0".
this->_local_offer->time.start = this->_local_offer->time.stop = 0;
}
void Sdp::sdp_add_attributes()
{
pjmedia_sdp_attr *a;
this->_local_offer->attr_count = 1;
a = PJ_POOL_ZALLOC_T (_pool, pjmedia_sdp_attr);
a->name=STR_SENDRECV;
_local_offer->attr[0] = a;
}
void Sdp::sdp_add_media_description()
{
pjmedia_sdp_media* med;
int nb_media, i;
med = PJ_POOL_ZALLOC_T (_pool, pjmedia_sdp_media);
nb_media = get_local_media_cap().size();
this->_local_offer->media_count = nb_media;
for (i=0; i<nb_media; i++) {
set_media_descriptor_line (get_local_media_cap() [i], &med);
this->_local_offer->media[i] = med;
}
}
// @TODO crypto should be a vector of string
void Sdp::sdp_add_sdes_attribute (std::vector<std::string>& crypto)
{
// temporary buffer used to store crypto attribute
char tempbuf[256];
std::vector<std::string>::iterator iter = crypto.begin();
while(iter != crypto.end()) {
// the attribute to add to sdp
pjmedia_sdp_attr *attribute = (pjmedia_sdp_attr*) pj_pool_zalloc(_pool, sizeof(pjmedia_sdp_attr));
attribute->name = pj_strdup3(_pool, "crypto");
// _debug("crypto from sdp: %s", crypto.c_str());
int len = pj_ansi_snprintf(tempbuf, sizeof(tempbuf),
"%.*s",(int)(*iter).size(), (*iter).c_str());
attribute->value.slen = len;
attribute->value.ptr = (char*) pj_pool_alloc (_pool, attribute->value.slen+1);
pj_memcpy (attribute->value.ptr, tempbuf, attribute->value.slen+1);
// get number of media for this SDP
int media_count = _local_offer->media_count;
// add crypto attribute to media
for(int i = 0; i < media_count; i++) {
if(pjmedia_sdp_media_add_attr(_local_offer->media[i], attribute) != PJ_SUCCESS) {
// if(pjmedia_sdp_attr_add(&(_local_offer->attr_count), _local_offer->attr, attribute) != PJ_SUCCESS){
throw sdpException();
}
}
iter++;
}
}
void Sdp::sdp_add_zrtp_attribute (pjmedia_sdp_media* media, std::string hash)
{
pjmedia_sdp_attr *attribute;
char tempbuf[256];
int len;
attribute = (pjmedia_sdp_attr*) pj_pool_zalloc (_pool, sizeof (pjmedia_sdp_attr));
attribute->name = pj_strdup3 (_pool, "zrtp-hash");
/* Format: ":version value" */
len = pj_ansi_snprintf (tempbuf, sizeof (tempbuf),
"%.*s %.*s",
4,
ZRTP_VERSION,
(int) hash.size(),
hash.c_str());
attribute->value.slen = len;
attribute->value.ptr = (char*) pj_pool_alloc (_pool, attribute->value.slen+1);
pj_memcpy (attribute->value.ptr, tempbuf, attribute->value.slen+1);
if (pjmedia_sdp_media_add_attr (media, attribute) != PJ_SUCCESS) {
throw sdpException();
}
}
std::string Sdp::media_to_string (void)
{
int size, i;
std::ostringstream res;
size = _local_media_cap.size();
for (i = 0; i < size ; i++) {
res << _local_media_cap[i]->to_string();
}
res << std::endl;
return res.str();
}
void Sdp::clean_session_media()
{
_session_media.clear();
}
void Sdp::set_negotiated_sdp (const pjmedia_sdp_session *sdp)
{
int nb_media, nb_codecs;
int i,j, port;
pjmedia_sdp_media *current;
sdpMedia *media;
std::string type, dir;
CodecsMap codecs_list;
CodecsMap::iterator iter;
pjmedia_sdp_attr *attribute = NULL;
pjmedia_sdp_rtpmap *rtpmap;
_negociated_offer = (pjmedia_sdp_session*) sdp;
codecs_list = Manager::instance().getCodecDescriptorMap().getCodecsMap();
// retrieve the media information
nb_media = _negociated_offer->media_count;
for (i=0; i<nb_media ; i++) {
// Retrieve the media
current = _negociated_offer->media[i];
type = current->desc.media.ptr;
port = current->desc.port;
media = new sdpMedia (type, port);
// Retrieve the payload
nb_codecs = current->desc.fmt_count; // Must be one
for (j=0 ; j<nb_codecs ; j++) {
attribute = pjmedia_sdp_media_find_attr (current, &STR_RTPMAP, NULL);
// pj_strtoul(attribute->pt)
if (!attribute)
return;
pjmedia_sdp_attr_to_rtpmap (_pool, attribute, &rtpmap);
// _debug("================== set_negociated_offer ===================== %i", pj_strtoul(&rtpmap->pt));
// _debug("================== set_negociated_offer ===================== %s", current->desc.fmt[j].ptr);
// _debug("================== set_negociated_offer ===================== %i", atoi(current->desc.fmt[j].ptr));
iter = codecs_list.find ( (AudioCodecType) pj_strtoul (&rtpmap->pt));
if (iter==codecs_list.end())
return;
media->add_codec (iter->second);
}
_session_media.push_back (media);
}
}
AudioCodec* Sdp::get_session_media (void)
{
int nb_media;
int nb_codec;
AudioCodec *codec = NULL;
std::vector<sdpMedia*> media_list;
_debug ("Executing sdp line %d - get_session_media ()", __LINE__);
media_list = get_session_media_list ();
nb_media = media_list.size();
if (nb_media > 0) {
nb_codec = media_list[0]->get_media_codec_list().size();
if (nb_codec > 0) {
codec = media_list[0]->get_media_codec_list() [0];
}
}
return codec;
}
void Sdp::toString (void)
{
std::ostringstream sdp;
int count, i;
sdp << "origin= " << _local_offer->origin.user.ptr << "\n";
sdp << "origin.id= " << _local_offer->origin.id << "\n";
sdp << "origin.version= " << _local_offer->origin.version<< "\n";
sdp << "origin.net_type= " << _local_offer->origin.net_type.ptr<< "\n";
sdp << "origin.addr_type= " << _local_offer->origin.addr_type.ptr<< "\n";
sdp << "name=" << _local_offer->name.ptr<< "\n";
sdp << "conn.net_type=" << _local_offer->conn->net_type.ptr<< "\n";
sdp << "conn.addr_type=" << _local_offer->conn->addr_type.ptr<< "\n";
sdp << "conn.addr=" << _local_offer->conn->addr.ptr<< "\n";
sdp << "start=" <<_local_offer->time.start<< "\n";
sdp << "stop=" <<_local_offer->time.stop<< "\n";
sdp << "attr_count=" << _local_offer->attr_count << "\n";
sdp << "media_count=" << _local_offer->media_count << "\n"; sdp << "m=" << _local_offer->media[0]->desc.media.ptr << " ";
sdp << _local_offer->media[0]->desc.port << " ";
sdp << _local_offer->media[0]->desc.transport.ptr << " ";
count = _local_offer->media[0]->desc.fmt_count;
for (i=0; i<count; i++) {
sdp << _local_offer->media[0]->desc.fmt[i].ptr << " ";
}
sdp << "\n";
_debug ("LOCAL SDP: \n%s", sdp.str().c_str());
}
void Sdp::set_local_media_capabilities ()
{
CodecOrder selected_codecs;
unsigned int i;
sdpMedia *audio;
CodecsMap codecs_list;
CodecsMap::iterator iter;
// Clean it first
_local_media_cap.clear();
_debug ("Fetch local media capabilities. Local extern audio port: %i" , get_local_extern_audio_port());
/* Only one audio media used right now */
audio = new sdpMedia (MIME_TYPE_AUDIO);
audio->set_port (get_local_extern_audio_port());
/* We retrieve the codecs selected by the user */
selected_codecs = Manager::instance().getCodecDescriptorMap().getActiveCodecs();
codecs_list = Manager::instance().getCodecDescriptorMap().getCodecsMap();
for (i=0; i<selected_codecs.size(); i++) {
iter=codecs_list.find (selected_codecs[i]);
if (iter!=codecs_list.end()) {
audio->add_codec (iter->second);
}
}
_local_media_cap.push_back (audio);
}
void Sdp::attribute_port_to_all_media (int port)
{
std::vector<sdpMedia*> medias;
int i, size;
set_local_extern_audio_port (port);
medias = get_local_media_cap ();
size = medias.size();
for (i=0; i<size; i++) {
medias[i]->set_port (port);
}
}
std::string Sdp::convert_int_to_string (int value)
{
std::ostringstream result;
result << value;
return result.str();
}
void Sdp::set_remote_ip_from_sdp (const pjmedia_sdp_session *r_sdp)
{
std::string remote_ip (r_sdp->conn->addr.ptr, r_sdp->conn->addr.slen);
_debug (" Remote IP from fetching SDP: %s", remote_ip.c_str());
this->set_remote_ip (remote_ip);
}
void Sdp::set_remote_audio_port_from_sdp (pjmedia_sdp_media *r_media)
{
int remote_port;
remote_port = r_media->desc.port;
_debug (" Remote Audio Port from fetching SDP: %d", remote_port);
this->set_remote_audio_port (remote_port);
}
void Sdp::set_media_transport_info_from_remote_sdp (const pjmedia_sdp_session *remote_sdp)
{
_debug ("Fetching media from sdp");
pjmedia_sdp_media *r_media;
this->get_remote_sdp_media_from_offer (remote_sdp, &r_media);
if (r_media==NULL) {
_debug ("SDP Failure: no remote sdp media found in the remote offer");
return;
}
this->set_remote_audio_port_from_sdp (r_media);
this->set_remote_ip_from_sdp (remote_sdp);
}
void Sdp::get_remote_sdp_media_from_offer (const pjmedia_sdp_session* remote_sdp, pjmedia_sdp_media** r_media)
{
int count, i;
count = remote_sdp->media_count;
*r_media = NULL;
for (i = 0; i < count; ++i) {
if (pj_stricmp2 (&remote_sdp->media[i]->desc.media, "audio") == 0) {
*r_media = remote_sdp->media[i];
return;
}
}
}
void Sdp::get_remote_sdp_crypto_from_offer (const pjmedia_sdp_session* remote_sdp, CryptoOffer& crypto_offer)
{
int i, j;
int attr_count, media_count;
pjmedia_sdp_attr *attribute;
pjmedia_sdp_media *media;
// get the number of media for this sdp session
media_count = remote_sdp->media_count;
// *r_crypto = pjmedia_sdp_media_find_attr(attribute, &STR_CRYPTO, NULL);
_debug("****************** Parse for Crypto ********************");
CryptoOffer remoteOffer;
// iterate over all media
for (i = 0; i < media_count; ++i) {
// _debug("%.*s", (int)remote_sdp->attr[i]->name.slen, remote_sdp->attr[i]->name.ptr);
// _debug("%.*s", (int)remote_sdp->attr[i]->value.slen, remote_sdp->attr[i]->value.ptr);
// get media
media = remote_sdp->media[i];
// get number of attribute for this memdia
attr_count = media->attr_count;
// iterate over all attribute for this media
for(j = 0; j < attr_count; j++) {
attribute = media->attr[j];
// test if this attribute is a crypto
if (pj_stricmp2 (&attribute->name, "crypto") == 0) {
_debug("****************** Found a Crypto ********************");
std::string attr(attribute->value.ptr, attribute->value.slen);
// @TODO our parser require the "a=crypto:" to be present
std::string full_attr = "a=crypto:";
full_attr += attr;
crypto_offer.push_back(full_attr);
}
}
}
}