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yate/libs/ysdp/session.cpp

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/**
* session.cpp
* This file is part of the YATE Project http://YATE.null.ro
*
* SDP media handling
*
* Yet Another Telephony Engine - a fully featured software PBX and IVR
* Copyright (C) 2004-2023 Null Team
*
* This software is distributed under multiple licenses;
* see the COPYING file in the main directory for licensing
* information for this specific distribution.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
*
* 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.
*/
#include <yatesdp.h>
namespace TelEngine {
/*
* SDPSession
*/
SDPSession::SDPSession(SDPParser* parser)
: m_parser(parser), m_mediaStatus(MediaMissing),
m_rtpForward(false), m_sdpForward(parser->sdpForward()), m_rtpMedia(0),
m_sdpSession(0), m_sdpVersion(0), m_sdpHash(YSTRING_INIT_HASH),
m_secure(m_parser->m_secure), m_rfc2833(m_parser->m_rfc2833),
m_ipv6(false), m_gpmd(parser->m_gpmd),
m_amrExtra(""), m_parsedParams(0), m_createSdpParams(""),
m_enabler(0), m_ptr(0)
{
setSdpDebug();
}
SDPSession::SDPSession(SDPParser* parser, NamedList& params)
: m_parser(parser), m_mediaStatus(MediaMissing),
m_rtpForward(false), m_sdpForward(parser->sdpForward()), m_rtpMedia(0),
m_sdpSession(0), m_sdpVersion(0), m_sdpHash(YSTRING_INIT_HASH),
m_ipv6(false), m_gpmd(false),
m_amrExtra(""), m_parsedParams(0), m_createSdpParams(""),
m_enabler(0), m_ptr(0)
{
setSdpDebug();
m_rtpForward = params.getBoolValue(YSTRING("rtp_forward"));
m_sdpForward = params.getBoolValue(YSTRING("forward_sdp"),m_sdpForward);
m_secure = params.getBoolValue(YSTRING("secure"),parser->m_secure);
m_gpmd = params.getBoolValue(YSTRING("forward_gpmd"),parser->m_gpmd);
m_rfc2833 = parser->m_rfc2833;
setRfc2833(params,false);
}
SDPSession::~SDPSession()
{
resetSdp();
}
// Set new media list. Return true if changed
bool SDPSession::setMedia(ObjList* media, bool preserveExisting)
{
if (media == m_rtpMedia)
return false;
DDebug(m_enabler,DebugAll,"SDPSession::setMedia(%p) [%p]",media,m_ptr);
ObjList* tmp = m_rtpMedia;
m_rtpMedia = media;
bool chg = m_rtpMedia != 0;
if (tmp) {
chg = false;
for (ObjList* o = tmp->skipNull(); o; o = o->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
if (media) {
ObjList* l = media->find(*m);
SDPMedia* newMedia = l ? static_cast<SDPMedia*>(l->get()) : 0;
if (newMedia && m->sameAs(newMedia,m_parser->ignorePort(),preserveExisting)) {
if (preserveExisting && m->isStarted()) {
XDebug(m_enabler,DebugAll,
"SDPSession::setMedia(%p) keeping existing media='%s' format='%s' [%p]",
media,m->c_str(),m->format().c_str(),m_ptr);
newMedia->keepRtp(*m);
}
continue;
}
}
chg = true;
mediaChanged(*m);
}
TelEngine::destruct(tmp);
}
printRtpMedia("Set media");
return chg;
}
// Put the list of net media in a parameter list
void SDPSession::putMedia(NamedList& msg, ObjList* mList, bool putPort, const NamedList* sessParams)
{
if (sessParams) {
const char* prefix = sessParams->safe("ssdp_");
for (ObjList* o = sessParams->paramList()->skipNull(); o; o = o->skipNext()) {
const NamedString* ns = static_cast<const NamedString*>(o->get());
msg.addParam(prefix + ns->name(),*ns);
}
}
if (!mList)
return;
bool audio = false;
bool other = false;
for (mList = mList->skipNull(); mList; mList = mList->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(mList->get());
m->putMedia(msg,putPort);
if (m->isAudio())
audio = true;
else
other = true;
}
if (other && !audio)
msg.setParam("media",String::boolText(false));
}
// Update the RFC 2833 availability and payload
void SDPSession::setRfc2833(const String& value, int rate)
{
m_rfc2833.update(rate,value,m_parser->m_rfc2833);
}
// Update the RFC 2833 availability and payload
void SDPSession::setRfc2833(const NamedList& params, bool force)
{
m_rfc2833.update(params,m_parser->m_rfc2833,force);
#ifdef DEBUG
String tmp;
TraceDebug(m_traceId,m_enabler,DebugAll,"Updated RFC 2833: %s [%p]",m_rfc2833.dump(tmp).c_str(),m_ptr);
#endif
}
// Build and dispatch a chan.rtp message for a given media. Update media on success
bool SDPSession::dispatchRtp(SDPMedia* media, const char* addr, bool start,
bool pick, RefObject* context)
{
DDebug(m_enabler,DebugAll,"SDPSession::dispatchRtp(%p,%s,%u,%u,%p) [%p]",
media,addr,start,pick,context,m_ptr);
Message* m = buildChanRtp(media,addr,start,context);
if (m)
dispatchingRtp(m,media);
if (!(m && Engine::dispatch(m))) {
TelEngine::destruct(m);
return false;
}
media->update(*m,start);
if (!pick) {
TelEngine::destruct(m);
return true;
}
m_rtpForward = false;
m_rtpLocalAddr = m->getValue("localip",m_rtpLocalAddr);
m_mediaStatus = m_rtpLocalAddr.null() ? MediaMuted : MediaStarted;
String sdpPrefix = m->getValue("osdp-prefix","osdp");
if (sdpPrefix) {
if (!sdpPrefix.endsWith("_"))
sdpPrefix += "_";
unsigned int n = m->length();
int dir = SDPMedia::DirUnknown;
for (unsigned int j = 0; j < n; j++) {
const NamedString* param = m->getParam(j);
if (!param)
continue;
String tmp = param->name();
if (tmp.startSkip(sdpPrefix,false) && tmp) {
DDebug(m_enabler,DebugInfo,
"Updating (from RTP message) %s parameter '%s' to '%s' [%p]",
media->c_str(),tmp.c_str(),param->c_str(),this);
media->parameter(tmp,*param,false);
SDPMedia::setDirection(dir,tmp);
}
}
media->direction(dir,false);
}
if (m_secure) {
int tag = m->getIntValue("crypto_tag",1);
tag = m->getIntValue("ocrypto_tag",tag);
const String* suite = m->getParam("ocrypto_suite");
const String* key = m->getParam("ocrypto_key");
const String* params = m->getParam("ocrypto_params");
if (suite && key && (tag >= 0)) {
String sdes(tag);
sdes << " " << *suite << " " << *key;
if (params)
sdes << " " << *params;
media->crypto(sdes,false);
}
}
TelEngine::destruct(m);
return true;
}
// Repeatedly calls dispatchRtp() for each media in the list
// Update it on success. Remove it on failure
bool SDPSession::dispatchRtp(const char* addr, bool start, RefObject* context)
{
if (!m_rtpMedia)
return false;
DDebug(m_enabler,DebugAll,"SDPSession::dispatchRtp(%s,%u,%p) [%p]",
addr,start,context,m_ptr);
bool ok = false;
ObjList* o = m_rtpMedia->skipNull();
while (o) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
if (dispatchRtp(m,addr,start,true,context)) {
ok = true;
o = o->skipNext();
}
else {
TraceDebug(m_traceId,m_enabler,DebugMild,
"Removing failed SDP media '%s' format '%s' from offer [%p]",
m->c_str(),m->format().safe(),m_ptr);
o->remove();
o = o->skipNull();
}
}
return ok;
}
// Try to start RTP for all media
bool SDPSession::startRtp(RefObject* context)
{
if (m_rtpForward || !m_rtpMedia || (m_mediaStatus != MediaStarted))
return false;
DDebug(m_enabler,DebugAll,"SDPSession::startRtp(%p) [%p]",context,m_ptr);
bool ok = false;
for (ObjList* o = m_rtpMedia->skipNull(); o; o = o->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
ok = dispatchRtp(m,m_rtpAddr,true,false,context) || ok;
}
return ok;
}
// Update from parameters. Build a default SDP if no media is found in params
bool SDPSession::updateSDP(const NamedList& params, bool defaults)
{
DDebug(m_enabler,DebugAll,"SDPSession::updateSdp('%s',%s) [%p]",
params.c_str(),String::boolText(defaults),m_ptr);
const char* sdpPrefix = params.getValue("osdp-prefix","osdp");
updateSessionParams(params);
ObjList* lst = 0;
unsigned int n = params.length();
String defFormats;
m_parser->getAudioFormats(defFormats);
for (unsigned int i = 0; i < n; i++) {
const NamedString* p = params.getParam(i);
if (!p)
continue;
// search for media or media_MEDIANAME parameters
String tmp(p->name());
if (!tmp.startSkip("media",false))
continue;
if (tmp && (tmp[0] != '_'))
continue;
// since we found at least one media declaration disable defaults
defaults = false;
// now tmp holds the suffix for the media, null for audio
bool audio = tmp.null();
// check if media is supported, default only for audio
if (!p->toBoolean(audio))
continue;
String fmts = params.getValue("formats" + tmp);
if (audio && fmts.null())
fmts = defFormats;
if (fmts.null())
continue;
String trans = params.getValue("transport" + tmp,"RTP/AVP");
String crypto;
if (m_secure)
crypto = params.getValue("crypto" + tmp);
if (audio)
tmp = "audio";
else
tmp >> "_";
SDPMedia* rtp = 0;
// try to take the media descriptor from the old list
if (m_rtpMedia) {
ObjList* om = m_rtpMedia->find(tmp);
if (om)
rtp = static_cast<SDPMedia*>(om->remove(false));
}
bool append = false;
if (rtp)
rtp->update(fmts);
else {
rtp = new SDPMedia(tmp,trans,fmts);
append = true;
}
rtp->crypto(crypto,false);
if (sdpPrefix) {
String prefix;
prefix << sdpPrefix << rtp->suffix() << "_";
for (unsigned int j = 0; j < n; j++) {
const NamedString* param = params.getParam(j);
if (!param)
continue;
tmp = param->name();
if (tmp.startSkip(prefix,false) && (tmp.find('_') < 0)) {
DDebug(m_enabler,DebugInfo,"%s (SDP update) %s parameter '%s' to '%s' [%p]",
append ? "Adding" : "Updating",rtp->c_str(),tmp.c_str(),param->c_str(),this);
rtp->parameter(tmp,*param,append);
}
}
}
if (!lst)
lst = new ObjList;
lst->append(rtp);
}
if (defaults && !lst) {
lst = new ObjList;
lst->append(new SDPMedia("audio","RTP/AVP",params.getValue("formats",defFormats)));
}
return setMedia(lst);
}
// Update RTP/SDP data from parameters
// Return true if media changed
bool SDPSession::updateRtpSDP(const NamedList& params)
{
DDebug(m_enabler,DebugAll,"SDPSession::updateRtpSDP(%s) [%p]",params.c_str(),m_ptr);
String addr;
ObjList* tmp = updateRtpSDP(params,addr,m_rtpMedia);
if (tmp) {
updateSessionParams(params);
bool chg = (m_rtpLocalAddr != addr);
m_rtpLocalAddr = addr;
return setMedia(tmp) || chg;
}
return false;
}
// Utility used in createSDP
static int addIP(String& buf, const char* addr, int family = SocketAddr::Unknown)
{
if (family != SocketAddr::IPv4 && family != SocketAddr::IPv6) {
if (addr) {
family = SocketAddr::family(addr);
if (family != SocketAddr::IPv4 && family != SocketAddr::IPv6)
family = SocketAddr::IPv4;
}
else
family = SocketAddr::IPv4;
}
if (family == SocketAddr::IPv4)
buf << "IN IP4 ";
else
buf << "IN IP6 ";
if (!TelEngine::null(addr))
buf << addr;
else if (family == SocketAddr::IPv4)
buf << SocketAddr::ipv4NullAddr();
else
buf << SocketAddr::ipv6NullAddr();
return family;
}
// Utility used in createSDP
// Build a 'fmtp' line if not already done. Add a parameter to it
static inline void setFmtpLine(String*& line, int payload, const char* param)
{
if (line)
line->append(param,";");
else {
line = new String("fmtp:");
*line << payload << " " << param;
}
}
// Creates a SDP body from transport address and list of media descriptors
// Use own list if given media list is 0
MimeSdpBody* SDPSession::createSDP(const char* addr, ObjList* mediaList)
{
DDebug(m_enabler,DebugAll,"SDPSession::createSDP('%s',%p) [%p]",addr,mediaList,m_ptr);
ObjList* mList = mediaList;
if (!mList)
mList = m_rtpMedia;
// if we got no media descriptors we simply create no SDP
if (!mList)
return 0;
if (!m_sdpSession)
m_sdpVersion = m_sdpSession = Time::secNow();
// override the address with the externally advertised if needed
if (addr && m_rtpNatAddr)
addr = m_rtpNatAddr;
if (!m_originAddr)
m_originAddr = addr ? addr : m_host.safe();
// no address means on hold or muted
String origin;
int f = addIP(origin,m_originAddr);
String conn;
addIP(conn,addr,f);
MimeSdpBody* sdp = new MimeSdpBody(true);
sdp->addLine("v","0");
// insert incomplete origin just for hashing purpose
NamedString* org = sdp->addLine("o",origin);
sdp->addLine("s",m_parser->m_sessionName);
sdp->addLine("c",conn);
sdp->addLine("t","0 0");
Lock lock(m_parser);
addSdpParams(sdp,m_createSdpParams);
int sessDir = 0;
// TODO: Add session level direction
bool defcodecs = m_parser->m_codecs.getBoolValue("default",true);
for (ObjList* ml = mList->skipNull(); ml; ml = ml->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(ml->get());
Rfc2833 rfc2833;
if (m->isAudio()) {
if (!m_rtpForward) {
const Rfc2833& mr = m->rfc2833();
for (int i = 0; i < Rfc2833::RateCount; ++i)
rfc2833[i] = (mr[i] >= 0) ? mr[i] : m_rfc2833[i];
}
else
rfc2833 = m->rfc2833();
}
String mline(m->fmtList());
ObjList* l = mline.split(',',false);
mline = *m;
mline << " " << (m->localPort() ? m->localPort().c_str() : "0") << " " << m->transport();
ObjList* map = m->mappings().split(',',false);
ObjList rtpmap;
ObjList* dest = &rtpmap;
String frm;
int ptime = 0;
ObjList* f = l;
Rfc2833 rfc2833Send;
for (; f; f = f->next()) {
const String* s = static_cast<const String*>(f->get());
if (s) {
if (*s == "g729b")
continue;
int payload = s->toInteger(SDPParser::s_payloads,-1);
int defcode = payload;
String tmp = *s;
tmp << "=";
bool found = false;
for (ObjList* pl = map; pl; pl = pl->next()) {
const String* mapping = static_cast<const String*>(pl->get());
if (!mapping)
continue;
found = mapping->startsWith(tmp);
if (!found) {
for (ObjList* o = pl->skipNext(); o; o = o->skipNext()) {
const String* tmpM = static_cast<const String*>(o->get());
if (tmpM->startsWith(tmp)) {
found = true;
mapping = tmpM;
break;
}
}
}
if (found) {
payload = -1;
tmp = *mapping;
tmp >> "=" >> payload;
found = true;
XDebug(m_enabler,DebugAll,"RTP mapped payload %d for '%s' [%p]",
payload,s->c_str(),m_ptr);
break;
}
String tmp2 = *mapping;
int pload;
tmp2 >> "=" >> pload;
if (payload == pload) {
XDebug(m_enabler,DebugAll,"RTP conflict for payload %d, allocating new [%p]",
payload,m_ptr);
payload = -1;
u_int32_t bmap = 0;
for (ObjList* sl = map; sl; sl = sl->next()) {
mapping = static_cast<const String*>(sl->get());
if (!mapping)
continue;
tmp2 = *mapping;
pload = 0;
tmp2 >> "=" >> pload;
if (pload >= 96 && pload < 127)
bmap |= 1 << (pload - 96);
}
// allocate free and non-standard is possible
for (pload = 96; pload < 127; pload++) {
if (rfc2833.includes(pload))
continue;
if (lookup(pload,SDPParser::s_rtpmap))
continue;
if ((bmap & (1 << (pload - 96))) == 0) {
payload = pload;
break;
}
}
if (payload >= 0)
break;
// none free, allocate from "standard" ones too
for (pload = 96; pload < 127; pload++) {
if (rfc2833.includes(pload))
continue;
if ((bmap & (1 << (pload - 96))) == 0) {
payload = pload;
break;
}
}
break;
}
}
if (payload >= 0) {
if (!found) {
tmp = *s;
tmp << "=" << payload;
map->append(new String(tmp));
}
if (defcode < 0)
defcode = payload;
const char* map = lookup(defcode,SDPParser::s_rtpmap);
if (map && m_parser->m_codecs.getBoolValue(*s,defcodecs && DataTranslator::canConvert(*s))) {
// Update RFC 2833 support to advertise
if (m->isAudio()) {
int r = Rfc2833::fmtRate(*s);
if (r < Rfc2833::RateCount)
rfc2833Send[r] = rfc2833[r];
}
frm << " " << payload;
String* temp = new String("rtpmap:");
*temp << payload << " " << map;
dest = dest->append(temp);
const String* fmtp = m->getParam("fmtp:" + *s);
temp = 0;
if (*s == YSTRING("ilbc20")) {
ptime = 20;
setFmtpLine(temp,payload,"mode=20");
}
else if (*s == YSTRING("ilbc30")) {
ptime = 30;
setFmtpLine(temp,payload,"mode=30");
}
else if (*s == YSTRING("g729")) {
setFmtpLine(temp,payload,"annexb=");
*temp << ((0 != l->find("g729b")) ? "yes" : "no");
}
else if (*s == YSTRING("amr") || s->startsWith("amr/")) {
setFmtpLine(temp,payload,"octet-align=0");
if (!m_rtpForward && m_amrExtra) {
addFmtpAmrExtra(*temp,fmtp);
fmtp = 0;
}
}
else if (*s == YSTRING("amr-o") || s->startsWith("amr-o/")) {
setFmtpLine(temp,payload,"octet-align=1");
if (!m_rtpForward && m_amrExtra) {
addFmtpAmrExtra(*temp,fmtp);
fmtp = 0;
}
}
if (fmtp)
setFmtpLine(temp,payload,*fmtp);
if (temp)
dest = dest->append(temp);
if (mediaList || m_gpmd) {
// RTP forward propagates General Purpose Media Descriptor
const String* gpmd = m->getParam("gpmd:" + *s);
if (gpmd) {
temp = new String("gpmd:");
*temp << payload << " " << *gpmd;
dest = dest->append(temp);
}
}
}
}
}
}
TelEngine::destruct(l);
TelEngine::destruct(map);
if (frm && m->isAudio()) {
for (int i = 0; i < Rfc2833::RateCount; ++i) {
if (rfc2833Send[i] < 0)
continue;
frm << " " << rfc2833Send[i];
String* s = new String;
s->printf("rtpmap:%d telephone-event/%s",rfc2833Send[i],Rfc2833::rateValue(i).c_str());
dest = dest->append(s);
}
}
if (frm.null()) {
if (m->isAudio() || !m->fmtList()) {
TraceDebug(m_traceId,m_enabler,DebugMild,"No formats for '%s', excluding from SDP [%p]",
m->c_str(),m_ptr);
continue;
}
TraceDebug(m_traceId,m_enabler,DebugInfo,"Assuming formats '%s' for media '%s' [%p]",
m->fmtList(),m->c_str(),m_ptr);
frm << " " << m->fmtList();
// brutal but effective
for (char* p = const_cast<char*>(frm.c_str()); *p; p++) {
if (*p == ',')
*p = ' ';
}
}
if (ptime) {
String* temp = new String("ptime:");
*temp << ptime;
dest = dest->append(temp);
}
sdp->addLine("m",mline + frm);
bool enc = false;
bool addedDir = false;
if (m->isModified())
addSdpParams(sdp,*m,&enc,&addedDir);
for (f = rtpmap.skipNull(); f; f = f->skipNext()) {
String* s = static_cast<String*>(f->get());
if (s)
sdp->addLine("a",*s);
}
if (addr && m->localCrypto()) {
sdp->addLine("a","crypto:" + m->localCrypto());
if (!enc)
sdp->addLine("a","encryption:optional");
}
if (!addedDir) {
const char* dir = lookup(m->direction(sessDir),SDPMedia::s_sdpDir);
if (dir)
sdp->addLine("a",dir);
}
}
// increment version if body hash changed
if ((YSTRING_INIT_HASH != m_sdpHash) && (sdp->hash() != m_sdpHash))
m_sdpVersion++;
m_sdpHash = sdp->hash();
// insert version in the origin line
origin.clear();
origin << "yate " << m_sdpSession << " " << m_sdpVersion << " " << *org;
*org = origin;
return sdp;
}
// Creates a SDP body for the current media status
MimeSdpBody* SDPSession::createSDP()
{
switch (m_mediaStatus) {
case MediaStarted:
return createSDP(getRtpAddr());
case MediaMuted:
return createSDP(0);
default:
return 0;
}
}
// Creates a SDP from RTP address data present in message
MimeSdpBody* SDPSession::createPasstroughSDP(NamedList& msg, bool update,
bool allowEmptyAddr)
{
XDebug(m_enabler,DebugAll,"createPasstroughSDP(%s,%u,%u) [%p]",
msg.c_str(),update,allowEmptyAddr,m_ptr);
String tmp = msg.getValue("rtp_forward");
msg.clearParam("rtp_forward");
if (!(m_rtpForward && tmp.toBoolean()))
return 0;
String* raw = msg.getParam("sdp_raw");
if (raw && m_sdpForward) {
msg.setParam("rtp_forward","accepted");
return new MimeSdpBody("application/sdp",raw->safe(),raw->length());
}
updateSessionParams(msg);
String addr;
ObjList* lst = updateRtpSDP(msg,addr,update ? m_rtpMedia : 0,allowEmptyAddr);
if (!lst)
return 0;
MimeSdpBody* sdp = createSDP(addr,lst);
if (update) {
m_rtpLocalAddr = addr;
setMedia(lst);
}
else
TelEngine::destruct(lst);
if (sdp)
msg.setParam("rtp_forward","accepted");
return sdp;
}
// Update media format lists from parameters
void SDPSession::updateFormats(const NamedList& msg, bool changeMedia)
{
if (!m_rtpMedia)
return;
unsigned int n = msg.length();
unsigned int i;
if (changeMedia) {
// check if any media is to be removed
for (i = 0; i < n; i++) {
const NamedString* p = msg.getParam(i);
if (!p)
continue;
// search for media or media_MEDIANAME parameters
String tmp = p->name();
if (!tmp.startSkip("media",false))
continue;
if (tmp && (tmp[0] != '_'))
continue;
// only check for explicit disabled media
if (p->toBoolean(true))
continue;
if (tmp.null())
tmp = "audio";
else
tmp = tmp.substr(1);
SDPMedia* rtp = static_cast<SDPMedia*>(m_rtpMedia->operator[](tmp));
if (!rtp)
continue;
TraceDebug(m_traceId,m_enabler,DebugNote,"Removing disabled media '%s' [%p]",
tmp.c_str(),m_ptr);
m_rtpMedia->remove(rtp,false);
mediaChanged(*rtp);
TelEngine::destruct(rtp);
}
}
for (i = 0; i < n; i++) {
const NamedString* p = msg.getParam(i);
if (!p)
continue;
// search for formats_MEDIANAME parameters
String tmp = p->name();
if (!tmp.startSkip("formats",false))
continue;
if (tmp && (tmp[0] != '_'))
continue;
const char* trans = 0;
// make sure we don't re-add explicitely disabled media
if (changeMedia && msg.getBoolValue("media"+tmp,true))
trans = msg.getValue("transport"+tmp);
if (tmp.null())
tmp = "audio";
else
tmp = tmp.substr(1);
SDPMedia* rtp = static_cast<SDPMedia*>(m_rtpMedia->operator[](tmp));
if (rtp) {
if (rtp->update(*p))
TraceDebug(m_traceId,m_enabler,DebugNote,"Formats for '%s' changed to '%s' [%p]",
tmp.c_str(),rtp->formats().c_str(),m_ptr);
}
else if (*p) {
TraceDebug(m_traceId,m_enabler,DebugNote,"Got formats '%s' for absent media '%s' [%p]",
p->c_str(),tmp.c_str(),m_ptr);
if (trans) {
rtp = new SDPMedia(tmp,trans,p->c_str());
m_rtpMedia->append(rtp);
mediaChanged(*rtp);
}
}
}
String sdpPrefix = msg.getValue("osdp-prefix");
if (!sdpPrefix)
return;
if (!sdpPrefix.endsWith("_"))
sdpPrefix += "_";
for (i = 0; i < n; i++) {
const NamedString* param = msg.getParam(i);
if (!param)
continue;
String tmp = param->name();
if (!tmp.startSkip(sdpPrefix,false))
continue;
int sep = tmp.find("_");
String media("audio");
if (sep > 0) {
media = tmp.substr(0,sep);
tmp = tmp.substr(sep + 1);
}
if (tmp.null() || (tmp.find("_") >= 0))
continue;
SDPMedia* rtp = static_cast<SDPMedia*>(m_rtpMedia->operator[](media));
if (rtp) {
DDebug(m_enabler,DebugInfo,"Updating (formats update) %s parameter '%s' to '%s' [%p]",
media.c_str(),tmp.c_str(),param->c_str(),this);
rtp->parameter(tmp,*param,false);
}
}
}
// Add raw SDP forwarding parameter
bool SDPSession::addSdpParams(NamedList& msg, const MimeBody* body)
{
if (!(m_sdpForward && body))
return false;
const MimeSdpBody* sdp =
static_cast<const MimeSdpBody*>(body->isSDP() ? body : body->getFirst("application/sdp"));
if (!sdp)
return false;
const DataBlock& raw = sdp->getBody();
String tmp((const char*)raw.data(),raw.length());
return addSdpParams(msg,tmp);
}
// Add raw SDP forwarding parameter
bool SDPSession::addSdpParams(NamedList& msg, const String& rawSdp)
{
if (!m_sdpForward)
return false;
msg.setParam("rtp_forward","yes");
msg.addParam("sdp_raw",rawSdp);
return true;
}
// Add RTP forwarding parameters to a message
bool SDPSession::addRtpParams(NamedList& msg, const String& natAddr,
const MimeBody* body, bool force, bool allowEmptyAddr)
{
XDebug(m_enabler,DebugAll,"addRtpParams(%s,%s,%p,%u,%u) media=%p rtpaddr=%s [%p]",
msg.c_str(),natAddr.c_str(),body,force,allowEmptyAddr,m_rtpMedia,
m_rtpAddr.c_str(),m_ptr);
if (!(m_rtpMedia && (m_rtpAddr || allowEmptyAddr)))
return false;
putMedia(msg,false);
if (force || (!startRtp() && m_rtpForward)) {
if (natAddr)
msg.addParam("rtp_nat_addr",natAddr);
msg.addParam("rtp_forward","yes");
msg.addParam("rtp_addr",m_rtpAddr);
for (ObjList* o = m_rtpMedia->skipNull(); o; o = o->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
msg.addParam("rtp_port" + m->suffix(),m->remotePort());
if (m->isAudio())
m->rfc2833().put(msg);
}
addSdpParams(msg,body);
return true;
}
return false;
}
// Reset this object to default values
void SDPSession::resetSdp(bool all)
{
m_mediaStatus = MediaMissing;
TelEngine::destruct(m_rtpMedia);
m_rtpForward = false;
m_sdpForward = false;
m_externalAddr.clear();
m_rtpAddr.clear();
m_rtpLocalAddr.clear();
m_sdpSession = 0;
m_sdpVersion = 0;
m_host.clear();
if (all) {
m_secure = m_parser->secure();
m_gpmd = m_parser->gpmd();
m_rfc2833 = m_parser->rfc2833();
}
setSessionParams(0);
m_createSdpParams.clearParams();
}
// Build a populated chan.rtp message
Message* SDPSession::buildChanRtp(SDPMedia* media, const char* addr, bool start, RefObject* context)
{
if (!(media && addr))
return 0;
Message* m = buildChanRtp(context);
if (!m)
return 0;
if (media->id())
m->addParam("rtpid",media->id());
m->addParam("media",*media);
m->addParam("transport",media->transport());
m->addParam("direction","bidir");
if (media->format())
m->addParam("format",media->format());
m->addParam("ipv6_support",String::boolText(m_ipv6));
if (m_rtpLocalAddr)
m->addParam("localip",m_rtpLocalAddr);
m->addParam("remoteip",addr);
if (start) {
m->addParam("remoteport",media->remotePort());
int payload = SDPMedia::payloadMapping(media->mappings(),media->format());
if (payload >= 0)
m->addParam("payload",String(payload));
int evpayload = media->selectRfc2833(media->format());
if (evpayload >= 0)
m->addParam("evpayload",String(evpayload));
else
m->addParam("evpayload",String::boolText(false));
}
if (m_secure) {
if (media->remoteCrypto()) {
String sdes = media->remoteCrypto();
static const Regexp r("^\\([0-9]\\+\\) \\+\\([^ ]\\+\\) \\+\\([^ ]\\+\\) *\\(.*\\)$");
if (sdes.matches(r)) {
m->addParam("secure",String::boolText(true));
m->addParam("crypto_tag",sdes.matchString(1));
m->addParam("crypto_suite",sdes.matchString(2));
m->addParam("crypto_key",sdes.matchString(3));
if (sdes.matchLength(4))
m->addParam("crypto_params",sdes.matchString(4));
}
else
TraceDebug(m_traceId,m_enabler,DebugWarn,"Invalid SDES: '%s' [%p]",sdes.c_str(),m_ptr);
}
else if (media->securable())
m->addParam("secure",String::boolText(true));
}
else
media->crypto(0,true);
unsigned int n = media->length();
for (unsigned int i = 0; i < n; i++) {
const NamedString* param = media->getParam(i);
if (!param)
continue;
m->addParam("sdp_" + param->name(),*param);
}
return m;
}
// Check if local RTP data changed for at least one media
bool SDPSession::localRtpChanged() const
{
if (!m_rtpMedia)
return false;
for (ObjList* o = m_rtpMedia->skipNull(); o; o = o->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
if (m->localChanged())
return true;
}
return false;
}
// Set or reset the local RTP data changed flag for all media
void SDPSession::setLocalRtpChanged(bool chg)
{
if (!m_rtpMedia)
return;
for (ObjList* o = m_rtpMedia->skipNull(); o; o = o->skipNext())
(static_cast<SDPMedia*>(o->get()))->setLocalChanged(chg);
}
// Update RTP/SDP data from parameters
ObjList* SDPSession::updateRtpSDP(const NamedList& params, String& rtpAddr, ObjList* oldList,
bool allowEmptyAddr)
{
XDebug(DebugAll,"SDPSession::updateRtpSDP(%s,%s,%p,%u)",
params.c_str(),rtpAddr.c_str(),oldList,allowEmptyAddr);
rtpAddr = params.getValue("rtp_addr");
if (!(rtpAddr || allowEmptyAddr))
return 0;
const char* sdpPrefix = params.getValue("osdp-prefix","osdp");
ObjList* lst = 0;
unsigned int n = params.length();
for (unsigned int i = 0; i < n; i++) {
const NamedString* p = params.getParam(i);
if (!p)
continue;
// search for rtp_port or rtp_port_MEDIANAME parameters
String tmp = p->name();
if (!tmp.startSkip("rtp_port",false))
continue;
if (tmp && (tmp[0] != '_'))
continue;
// now tmp holds the suffix for the media, null for audio
bool audio = tmp.null();
// check if media is supported, default only for audio
if (!params.getBoolValue("media" + tmp,audio))
continue;
int port = p->toInteger();
if (!(port || allowEmptyAddr))
continue;
const char* fmts = params.getValue("formats" + tmp);
if (!fmts)
continue;
String trans = params.getValue("transport" + tmp,"RTP/AVP");
if (audio)
tmp = "audio";
else
tmp >> "_";
SDPMedia* rtp = 0;
// try to take the media descriptor from the old list
if (oldList) {
ObjList* om = oldList->find(tmp);
if (om)
rtp = static_cast<SDPMedia*>(om->remove(false));
}
bool append = false;
if (rtp)
rtp->update(fmts,-1,port);
else {
rtp = new SDPMedia(tmp,trans,fmts,-1,port);
append = true;
}
int dir = SDPMedia::DirUnknown;
if (sdpPrefix) {
for (unsigned int j = 0; j < n; j++) {
const NamedString* param = params.getParam(j);
if (!param)
continue;
tmp = param->name();
if (tmp.startSkip(sdpPrefix + rtp->suffix() + "_",false) && (tmp.find('_') < 0)) {
rtp->parameter(tmp,*param,append);
SDPMedia::setDirection(dir,tmp);
}
}
}
rtp->mappings(params.getValue("rtp_mapping" + rtp->suffix()));
if (audio) {
Rfc2833 rfc2833;
for (int i = 0; i < Rfc2833::RateCount; ++i) {
if (i == Rfc2833::Rate8khz)
rfc2833[i] = params.getIntValue(YSTRING("rtp_rfc2833"),-1);
else
rfc2833[i] = params.getIntValue("rtp_rfc2833_" + Rfc2833::rateValue(i),-1);
}
rtp->rfc2833(rfc2833);
}
rtp->crypto(params.getValue("crypto" + rtp->suffix()),false);
rtp->direction(dir,false);
if (!lst)
lst = new ObjList;
lst->append(rtp);
}
return lst;
}
// Media changed notification.
void SDPSession::mediaChanged(const SDPMedia& media)
{
XDebug(m_enabler,DebugAll,"SDPSession::mediaChanged('%s' %p)%s%s [%p]",
media.c_str(),&media,(media.id() ? " id=" : ""),media.id().safe(),m_ptr);
}
// Dispatch rtp notification
void SDPSession::dispatchingRtp(Message*& msg, SDPMedia* media)
{
XDebug(m_enabler,DebugAll,"SDPSession::dispatchingRtp(%p,%p) [%p]",msg,media,m_ptr);
}
// Set data used in debug
void SDPSession::setSdpDebug(DebugEnabler* enabler, void* ptr, const String& traceId)
{
m_enabler = enabler ? enabler : static_cast<DebugEnabler*>(m_parser);
m_ptr = ptr ? ptr : (void*)this;
m_traceId = traceId;
}
// Print current media to output
void SDPSession::printRtpMedia(const char* reason)
{
if (!(m_rtpMedia && m_enabler->debugAt(DebugAll)))
return;
String tmp;
for (ObjList* o = m_rtpMedia->skipNull(); o; o = o->skipNext()) {
SDPMedia* m = static_cast<SDPMedia*>(o->get());
if (tmp)
tmp << " ";
tmp << m->c_str() << "=" << m->formats();
}
TraceDebug(m_traceId,m_enabler,DebugAll,"%s: %s [%p]",reason,tmp.c_str(),m_ptr);
}
// Set extra parameters for formats
void SDPSession::setFormatsExtra(const NamedList& list, bool out)
{
const String* amr = list.getParam(out ? YSTRING("oamr_extra") : YSTRING("iamr_extra"));
m_amrExtra.assign("");
m_amrExtra.clearParams();
if (!TelEngine::null(amr)) {
ObjList* l = amr->split(';',false);
ObjList* o = l->skipNull();
if (o) {
m_amrExtra.assign(*amr);
for (; o; o = o->skipNext()) {
const String* s = static_cast<String*>(o->get());
int pos = s->find('=');
if (pos >= 0) {
String n = s->substr(0,pos + 1).trimBlanks();
if (n) {
m_amrExtra.addParam(n,s->substr(pos + 1));
continue;
}
}
m_amrExtra.addParam(*s,0);
}
}
TelEngine::destruct(l);
}
}
// Parse a received SDP body, process session level parameters.
NamedList* SDPSession::parseSessionParams(const MimeSdpBody* sdp)
{
NamedList* nl = 0;
for (const ObjList* o = (sdp ? sdp->lines().skipNull() : 0); o; o = o->skipNext()) {
const NamedString* l = static_cast<const NamedString*>(o->get());
if (l->name() == YSTRING("m"))
break;
const char* pref = 0;
if (l->name() == YSTRING("b"))
pref = "BW-";
else if (l->name() != YSTRING("a"))
continue;
NamedString* ns = 0;
int pos = l->find(':');
if (pos >= 0)
ns = new NamedString(pref + l->substr(0,pos),l->substr(pos + 1));
else
ns = new NamedString(pref + *l);
XDebug(m_enabler,DebugAll,"Parsed sess SDP param %s='%s' [%p]",
ns->name().c_str(),ns->safe(),m_ptr);
if (!nl) {
Lock lck(m_parser);
String pref = m_parser->m_ssdpParam;
if (!pref)
break;
nl = new NamedList(pref + "_");
}
nl->addParam(ns);
}
return nl;
}
// Replace SDP sesison
void SDPSession::updateSessionParams(const NamedList& nl)
{
String pref;
Lock lck(m_parser);
if (m_parser->m_ssdpParam)
pref = "o" + m_parser->m_ssdpParam;
lck.drop();
pref = nl.getValue(YSTRING("ossdp-prefix"),pref);
XDebug(m_enabler,DebugAll,"updateSessionParams('%s') pref='%s' [%p]",
nl.c_str(),pref.c_str(),m_ptr);
if (!pref)
return;
pref << "_";
m_createSdpParams.clearParams();
int pLen = pref.length();
for (ObjList* o = nl.paramList()->skipNull(); o; o = o->skipNext()) {
const NamedString* p = static_cast<const NamedString*>(o->get());
if (p->name().startsWith(pref) && p->name().rfind('_') < pLen) {
NamedString* ns = new NamedString(p->name().substr(pLen),*p);
m_createSdpParams.addParam(ns);
XDebug(m_enabler,DebugAll,"Added sess create SDP param %s='%s' [%p]",
ns->name().c_str(),ns->safe(),m_ptr);
}
}
}
// Add extra AMR params to fmtp line
void SDPSession::addFmtpAmrExtra(String& buf, const String* fmtp)
{
if (TelEngine::null(fmtp)) {
buf.append(m_amrExtra,";");
return;
}
// Remove from 'fmtp' parameters we are setting from extra
ObjList* l = fmtp->split(';',false);
for (ObjList* f = l->skipNull(); f;) {
String& s = *static_cast<String*>(f->get());
s = s.trimBlanks();
NamedString* found = 0;
if (s) {
int pos = s.find('=');
if (pos >= 0) {
for (ObjList* o = m_amrExtra.paramList()->skipNull(); o; o = o->skipNext()) {
NamedString* ns = static_cast<NamedString*>(o->get());
if (s.startsWith(ns->name())) {
found = ns;
break;
}
}
}
else
found = m_amrExtra.getParam(s);
}
if (found) {
f->remove();
f = f->skipNull();
}
else
f = f->skipNext();
}
buf.append(m_amrExtra,";");
buf.append(l,";");
TelEngine::destruct(l);
}
// Add session or media parameters
void SDPSession::addSdpParams(MimeSdpBody* sdp, const NamedList& params, bool* enc, bool* dir)
{
for (ObjList* o = params.paramList()->skipNull(); o; o = o->skipNext()) {
const NamedString* p = static_cast<const NamedString*>(o->get());
if (p->name().find(':') >= 0)
continue;
const char* type = "a";
String tmp = p->name();
if (tmp.startSkip("BW-",false)) {
if (!tmp)
continue;
type = "b";
}
else {
if (dir)
*dir = *dir || lookup(tmp,SDPMedia::s_sdpDir);
if (enc)
*enc = *enc || (tmp == YSTRING("encryption"));
}
if (*p)
tmp << ":" << *p;
sdp->addLine(type,tmp);
}
}
}; // namespace TelEngine
/* vi: set ts=8 sw=4 sts=4 noet: */
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