/*! \brief Function which adds ICE attributes to a media stream */
static void add_ice_to_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media, pj_pool_t *pool, pjmedia_sdp_media *media)
{
struct ast_rtp_engine_ice *ice;
struct ao2_container *candidates;
const char *username, *password;
pj_str_t stmp;
pjmedia_sdp_attr *attr;
struct ao2_iterator it_candidates;
struct ast_rtp_engine_ice_candidate *candidate;
if (!session->endpoint->media.rtp.ice_support || !(ice = ast_rtp_instance_get_ice(session_media->rtp)) ||
!(candidates = ice->get_local_candidates(session_media->rtp))) {
return;
}
if ((username = ice->get_ufrag(session_media->rtp))) {
attr = pjmedia_sdp_attr_create(pool, "ice-ufrag", pj_cstr(&stmp, username));
media->attr[media->attr_count++] = attr;
}
if ((password = ice->get_password(session_media->rtp))) {
attr = pjmedia_sdp_attr_create(pool, "ice-pwd", pj_cstr(&stmp, password));
media->attr[media->attr_count++] = attr;
}
it_candidates = ao2_iterator_init(candidates, 0);
for (; (candidate = ao2_iterator_next(&it_candidates)); ao2_ref(candidate, -1)) {
struct ast_str *attr_candidate = ast_str_create(128);
ast_str_set(&attr_candidate, -1, "%s %u %s %d %s ", candidate->foundation, candidate->id, candidate->transport,
candidate->priority, ast_sockaddr_stringify_addr_remote(&candidate->address));
ast_str_append(&attr_candidate, -1, "%s typ ", ast_sockaddr_stringify_port(&candidate->address));
switch (candidate->type) {
case AST_RTP_ICE_CANDIDATE_TYPE_HOST:
ast_str_append(&attr_candidate, -1, "host");
break;
case AST_RTP_ICE_CANDIDATE_TYPE_SRFLX:
ast_str_append(&attr_candidate, -1, "srflx");
break;
case AST_RTP_ICE_CANDIDATE_TYPE_RELAYED:
ast_str_append(&attr_candidate, -1, "relay");
break;
}
if (!ast_sockaddr_isnull(&candidate->relay_address)) {
ast_str_append(&attr_candidate, -1, " raddr %s rport", ast_sockaddr_stringify_addr_remote(&candidate->relay_address));
ast_str_append(&attr_candidate, -1, " %s", ast_sockaddr_stringify_port(&candidate->relay_address));
}
attr = pjmedia_sdp_attr_create(pool, "candidate", pj_cstr(&stmp, ast_str_buffer(attr_candidate)));
media->attr[media->attr_count++] = attr;
ast_free(attr_candidate);
}
ao2_iterator_destroy(&it_candidates);
ao2_ref(candidates, -1);
}
void Sdp::addZrtpAttribute(pjmedia_sdp_media* media, std::string hash)
{
/* Format: ":version value" */
std::string val = "1.10 " + hash;
pj_str_t value = { (char*)val.c_str(), val.size() };
pjmedia_sdp_attr *attr = pjmedia_sdp_attr_create(memPool_, "zrtp-hash", &value);
if (pjmedia_sdp_media_add_attr(media, attr) != PJ_SUCCESS)
throw SdpException("Could not add zrtp attribute to media");
}
void Sdp::addSdesAttribute(const std::vector<std::string>& crypto)
{
for (std::vector<std::string>::const_iterator iter = crypto.begin();
iter != crypto.end(); ++iter) {
pj_str_t val = { (char*)(*iter).c_str(), (*iter).size() };
pjmedia_sdp_attr *attr = pjmedia_sdp_attr_create(memPool_, "crypto", &val);
for (unsigned i = 0; i < localSession_->media_count; i++)
if (pjmedia_sdp_media_add_attr(localSession_->media[i], attr) != PJ_SUCCESS)
throw SdpException("Could not add sdes attribute to media");
}
}
pjmedia_sdp_media *Sdp::setMediaDescriptorLine()
{
pjmedia_sdp_media *med = PJ_POOL_ZALLOC_T(memPool_, pjmedia_sdp_media);
med->desc.media = pj_str((char*)"audio");
med->desc.port_count = 1;
med->desc.port = localAudioPort_;
// in case of sdes, media are tagged as "RTP/SAVP", RTP/AVP elsewhere
med->desc.transport = pj_str(srtpCrypto_.empty() ? (char*)"RTP/AVP" : (char*)"RTP/SAVP");
med->desc.fmt_count = codec_list_.size();
for (unsigned i=0; i<med->desc.fmt_count; i++) {
sfl::Codec *codec = codec_list_[i];
std::ostringstream result;
result << (int)codec->getPayloadType();
pj_strdup2(memPool_, &med->desc.fmt[i], result.str().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
pjmedia_sdp_rtpmap rtpmap;
rtpmap.pt = med->desc.fmt[i];
rtpmap.enc_name = pj_str((char*) codec->getMimeSubtype().c_str());
// G722 require G722/8000 media description even if it is 16000 codec
if (codec->getPayloadType() == 9) {
rtpmap.clock_rate = 8000;
} else {
rtpmap.clock_rate = codec->getClockRate();
}
rtpmap.param.ptr = ((char* const)"");
rtpmap.param.slen = 0;
pjmedia_sdp_attr *attr;
pjmedia_sdp_rtpmap_to_attr(memPool_, &rtpmap, &attr);
med->attr[med->attr_count++] = attr;
}
med->attr[ med->attr_count++] = pjmedia_sdp_attr_create(memPool_, "sendrecv", NULL);
if (!zrtpHelloHash_.empty())
addZrtpAttribute(med, zrtpHelloHash_);
setTelephoneEventRtpmap(med);
return med;
}
static pjmedia_sdp_attr* generate_fmtp_attr(pj_pool_t *pool, struct ast_format *format, int rtp_code)
{
struct ast_str *fmtp0 = ast_str_alloca(256);
pj_str_t fmtp1;
pjmedia_sdp_attr *attr = NULL;
char *tmp;
ast_format_generate_sdp_fmtp(format, rtp_code, &fmtp0);
if (ast_str_strlen(fmtp0)) {
tmp = ast_str_buffer(fmtp0) + ast_str_strlen(fmtp0) - 1;
/* remove any carriage return line feeds */
while (*tmp == '\r' || *tmp == '\n') --tmp;
*++tmp = '\0';
/* ast...generate gives us everything, just need value */
tmp = strchr(ast_str_buffer(fmtp0), ':');
if (tmp && tmp + 1) {
fmtp1 = pj_str(tmp + 1);
} else {
fmtp1 = pj_str(ast_str_buffer(fmtp0));
}
attr = pjmedia_sdp_attr_create(pool, "fmtp", &fmtp1);
}
return attr;
}
static int add_crypto_to_stream(struct ast_sip_session *session,
struct ast_sip_session_media *session_media,
pj_pool_t *pool, pjmedia_sdp_media *media)
{
pj_str_t stmp;
pjmedia_sdp_attr *attr;
enum ast_rtp_dtls_hash hash;
const char *crypto_attribute;
struct ast_rtp_engine_dtls *dtls;
static const pj_str_t STR_NEW = { "new", 3 };
static const pj_str_t STR_EXISTING = { "existing", 8 };
static const pj_str_t STR_ACTIVE = { "active", 6 };
static const pj_str_t STR_PASSIVE = { "passive", 7 };
static const pj_str_t STR_ACTPASS = { "actpass", 7 };
static const pj_str_t STR_HOLDCONN = { "holdconn", 8 };
switch (session_media->encryption) {
case AST_SIP_MEDIA_ENCRYPT_NONE:
case AST_SIP_MEDIA_TRANSPORT_INVALID:
break;
case AST_SIP_MEDIA_ENCRYPT_SDES:
if (!session_media->srtp) {
session_media->srtp = ast_sdp_srtp_alloc();
if (!session_media->srtp) {
return -1;
}
}
crypto_attribute = ast_sdp_srtp_get_attrib(session_media->srtp,
0 /* DTLS running? No */,
session->endpoint->media.rtp.srtp_tag_32 /* 32 byte tag length? */);
if (!crypto_attribute) {
/* No crypto attribute to add, bad news */
return -1;
}
attr = pjmedia_sdp_attr_create(pool, "crypto", pj_cstr(&stmp, crypto_attribute));
media->attr[media->attr_count++] = attr;
break;
case AST_SIP_MEDIA_ENCRYPT_DTLS:
if (setup_dtls_srtp(session, session_media)) {
return -1;
}
dtls = ast_rtp_instance_get_dtls(session_media->rtp);
if (!dtls) {
return -1;
}
switch (dtls->get_connection(session_media->rtp)) {
case AST_RTP_DTLS_CONNECTION_NEW:
attr = pjmedia_sdp_attr_create(pool, "connection", &STR_NEW);
media->attr[media->attr_count++] = attr;
break;
case AST_RTP_DTLS_CONNECTION_EXISTING:
attr = pjmedia_sdp_attr_create(pool, "connection", &STR_EXISTING);
media->attr[media->attr_count++] = attr;
break;
default:
break;
}
switch (dtls->get_setup(session_media->rtp)) {
case AST_RTP_DTLS_SETUP_ACTIVE:
attr = pjmedia_sdp_attr_create(pool, "setup", &STR_ACTIVE);
media->attr[media->attr_count++] = attr;
break;
case AST_RTP_DTLS_SETUP_PASSIVE:
attr = pjmedia_sdp_attr_create(pool, "setup", &STR_PASSIVE);
media->attr[media->attr_count++] = attr;
break;
case AST_RTP_DTLS_SETUP_ACTPASS:
attr = pjmedia_sdp_attr_create(pool, "setup", &STR_ACTPASS);
media->attr[media->attr_count++] = attr;
break;
case AST_RTP_DTLS_SETUP_HOLDCONN:
attr = pjmedia_sdp_attr_create(pool, "setup", &STR_HOLDCONN);
media->attr[media->attr_count++] = attr;
break;
default:
break;
}
hash = dtls->get_fingerprint_hash(session_media->rtp);
crypto_attribute = dtls->get_fingerprint(session_media->rtp);
if (crypto_attribute && (hash == AST_RTP_DTLS_HASH_SHA1 || hash == AST_RTP_DTLS_HASH_SHA256)) {
RAII_VAR(struct ast_str *, fingerprint, ast_str_create(64), ast_free);
if (!fingerprint) {
return -1;
}
if (hash == AST_RTP_DTLS_HASH_SHA1) {
ast_str_set(&fingerprint, 0, "SHA-1 %s", crypto_attribute);
} else {
ast_str_set(&fingerprint, 0, "SHA-256 %s", crypto_attribute);
}
attr = pjmedia_sdp_attr_create(pool, "fingerprint", pj_cstr(&stmp, ast_str_buffer(fingerprint)));
media->attr[media->attr_count++] = attr;
}
break;
}
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index)
{
struct transport_srtp *srtp = (struct transport_srtp*) tp;
pjmedia_sdp_media *m_rem, *m_loc;
enum { MAXLEN = 512 };
char buffer[MAXLEN];
int buffer_len;
pj_status_t status;
pjmedia_sdp_attr *attr;
pj_str_t attr_value;
unsigned i, j;
PJ_ASSERT_RETURN(tp && sdp_pool && sdp_local, PJ_EINVAL);
srtp->offerer_side = sdp_remote == NULL;
m_rem = sdp_remote ? sdp_remote->media[media_index] : NULL;
m_loc = sdp_local->media[media_index];
/* Bypass if media transport is not RTP/AVP or RTP/SAVP */
if (pj_stricmp(&m_loc->desc.transport, &ID_RTP_AVP) != 0 &&
pj_stricmp(&m_loc->desc.transport, &ID_RTP_SAVP) != 0)
goto BYPASS_SRTP;
/* If the media is inactive, do nothing. */
if (pjmedia_sdp_media_find_attr(m_loc, &ID_INACTIVE, NULL) ||
(m_rem && pjmedia_sdp_media_find_attr(m_rem, &ID_INACTIVE, NULL)))
goto BYPASS_SRTP;
/* Check remote media transport & set local media transport
* based on SRTP usage option.
*/
if (srtp->offerer_side) {
/* Generate transport */
switch (srtp->setting.use) {
case PJMEDIA_SRTP_DISABLED:
goto BYPASS_SRTP;
case PJMEDIA_SRTP_OPTIONAL:
m_loc->desc.transport =
(srtp->peer_use == PJMEDIA_SRTP_MANDATORY)?
ID_RTP_SAVP : ID_RTP_AVP;
break;
case PJMEDIA_SRTP_MANDATORY:
m_loc->desc.transport = ID_RTP_SAVP;
break;
}
/* Generate crypto attribute if not yet */
if (pjmedia_sdp_media_find_attr(m_loc, &ID_CRYPTO, NULL) == NULL) {
for (i=0; i<srtp->setting.crypto_count; ++i) {
/* Offer crypto-suites based on setting. */
buffer_len = MAXLEN;
status = generate_crypto_attr_value(srtp->pool, buffer, &buffer_len,
&srtp->setting.crypto[i],
i+1);
if (status != PJ_SUCCESS)
return status;
/* If buffer_len==0, just skip the crypto attribute. */
if (buffer_len) {
pj_strset(&attr_value, buffer, buffer_len);
attr = pjmedia_sdp_attr_create(srtp->pool, ID_CRYPTO.ptr,
&attr_value);
m_loc->attr[m_loc->attr_count++] = attr;
}
}
}
} else {
/* Answerer side */
pj_assert(sdp_remote && m_rem);
/* Generate transport */
switch (srtp->setting.use) {
case PJMEDIA_SRTP_DISABLED:
if (pj_stricmp(&m_rem->desc.transport, &ID_RTP_SAVP) == 0)
return PJMEDIA_SRTP_ESDPINTRANSPORT;
goto BYPASS_SRTP;
case PJMEDIA_SRTP_OPTIONAL:
m_loc->desc.transport = m_rem->desc.transport;
break;
case PJMEDIA_SRTP_MANDATORY:
if (pj_stricmp(&m_rem->desc.transport, &ID_RTP_SAVP) != 0)
return PJMEDIA_SRTP_ESDPINTRANSPORT;
m_loc->desc.transport = ID_RTP_SAVP;
break;
}
/* Generate crypto attribute if not yet */
if (pjmedia_sdp_media_find_attr(m_loc, &ID_CRYPTO, NULL) == NULL) {
pjmedia_srtp_crypto tmp_rx_crypto;
pj_bool_t has_crypto_attr = PJ_FALSE;
int matched_idx = -1;
int chosen_tag = 0;
int tags[64]; /* assume no more than 64 crypto attrs in a media */
unsigned cr_attr_count = 0;
/* Find supported crypto-suite, get the tag, and assign policy_local */
for (i=0; i<m_rem->attr_count; ++i) {
if (pj_stricmp(&m_rem->attr[i]->name, &ID_CRYPTO) != 0)
continue;
has_crypto_attr = PJ_TRUE;
status = parse_attr_crypto(srtp->pool, m_rem->attr[i],
&tmp_rx_crypto, &tags[cr_attr_count]);
if (status != PJ_SUCCESS)
return status;
/* Check duplicated tag */
for (j=0; j<cr_attr_count; ++j) {
if (tags[j] == tags[cr_attr_count]) {
DEACTIVATE_MEDIA(sdp_pool, m_loc);
return PJMEDIA_SRTP_ESDPDUPCRYPTOTAG;
}
}
if (matched_idx == -1) {
/* lets see if the crypto-suite offered is supported */
for (j=0; j<srtp->setting.crypto_count; ++j)
if (pj_stricmp(&tmp_rx_crypto.name,
&srtp->setting.crypto[j].name) == 0)
{
int cs_idx = get_crypto_idx(&tmp_rx_crypto.name);
/* Force to use test key */
/* bad keys for snom: */
//char *hex_test_key = "58b29c5c8f42308120ce857e439f2d"
// "7810a8b10ad0b1446be5470faea496";
//char *hex_test_key = "20a26aac7ba062d356ff52b61e3993"
// "ccb78078f12c64db94b9c294927fd0";
//pj_str_t *test_key = &srtp->setting.crypto[j].key;
//char *raw_test_key = pj_pool_zalloc(srtp->pool, 64);
//hex_string_to_octet_string(
// raw_test_key,
// hex_test_key,
// strlen(hex_test_key));
//pj_strset(test_key, raw_test_key,
// crypto_suites[cs_idx].cipher_key_len);
/* EO Force to use test key */
if (tmp_rx_crypto.key.slen !=
(int)crypto_suites[cs_idx].cipher_key_len)
return PJMEDIA_SRTP_EINKEYLEN;
srtp->rx_policy_neg = tmp_rx_crypto;
chosen_tag = tags[cr_attr_count];
matched_idx = j;
break;
}
}
cr_attr_count++;
}
/* Check crypto negotiation result */
switch (srtp->setting.use) {
case PJMEDIA_SRTP_DISABLED:
pj_assert(!"Should never reach here");
break;
case PJMEDIA_SRTP_OPTIONAL:
/* bypass SRTP when no crypto-attr and remote uses RTP/AVP */
if (!has_crypto_attr &&
pj_stricmp(&m_rem->desc.transport, &ID_RTP_AVP) == 0)
goto BYPASS_SRTP;
/* bypass SRTP when nothing match and remote uses RTP/AVP */
else if (matched_idx == -1 &&
pj_stricmp(&m_rem->desc.transport, &ID_RTP_AVP) == 0)
goto BYPASS_SRTP;
break;
case PJMEDIA_SRTP_MANDATORY:
/* Do nothing, intentional */
break;
}
/* No crypto attr */
if (!has_crypto_attr) {
DEACTIVATE_MEDIA(sdp_pool, m_loc);
return PJMEDIA_SRTP_ESDPREQCRYPTO;
}
/* No crypto match */
if (matched_idx == -1) {
DEACTIVATE_MEDIA(sdp_pool, m_loc);
return PJMEDIA_SRTP_ENOTSUPCRYPTO;
}
/* we have to generate crypto answer,
* with srtp->tx_policy_neg matched the offer
* and rem_tag contains matched offer tag.
*/
buffer_len = MAXLEN;
status = generate_crypto_attr_value(srtp->pool, buffer, &buffer_len,
&srtp->setting.crypto[matched_idx],
chosen_tag);
if (status != PJ_SUCCESS)
return status;
srtp->tx_policy_neg = srtp->setting.crypto[matched_idx];
/* If buffer_len==0, just skip the crypto attribute. */
if (buffer_len) {
pj_strset(&attr_value, buffer, buffer_len);
attr = pjmedia_sdp_attr_create(sdp_pool, ID_CRYPTO.ptr,
&attr_value);
m_loc->attr[m_loc->attr_count++] = attr;
}
/* At this point, we get valid rx_policy_neg & tx_policy_neg. */
}
}
goto PROPAGATE_MEDIA_CREATE;
BYPASS_SRTP:
srtp->bypass_srtp = PJ_TRUE;
PROPAGATE_MEDIA_CREATE:
return pjmedia_transport_encode_sdp(srtp->member_tp, sdp_pool,
sdp_local, sdp_remote, media_index);
}
/* Update media direction based on peer's media direction */
static void update_media_direction(pj_pool_t *pool,
const pjmedia_sdp_media *remote,
pjmedia_sdp_media *local)
{
pjmedia_dir old_dir = PJMEDIA_DIR_ENCODING_DECODING,
new_dir;
/* Get the media direction of local SDP */
if (pjmedia_sdp_media_find_attr2(local, "sendonly", NULL))
old_dir = PJMEDIA_DIR_ENCODING;
else if (pjmedia_sdp_media_find_attr2(local, "recvonly", NULL))
old_dir = PJMEDIA_DIR_DECODING;
else if (pjmedia_sdp_media_find_attr2(local, "inactive", NULL))
old_dir = PJMEDIA_DIR_NONE;
new_dir = old_dir;
/* Adjust local media direction based on remote media direction */
if (pjmedia_sdp_media_find_attr2(remote, "inactive", NULL) != NULL) {
/* If remote has "a=inactive", then local is inactive too */
new_dir = PJMEDIA_DIR_NONE;
} else if(pjmedia_sdp_media_find_attr2(remote, "sendonly", NULL) != NULL) {
/* If remote has "a=sendonly", then set local to "recvonly" if
* it is currently "sendrecv". Otherwise if local is NOT "recvonly",
* then set local direction to "inactive".
*/
switch (old_dir) {
case PJMEDIA_DIR_ENCODING_DECODING:
new_dir = PJMEDIA_DIR_DECODING;
break;
case PJMEDIA_DIR_DECODING:
/* No change */
break;
default:
new_dir = PJMEDIA_DIR_NONE;
break;
}
} else if(pjmedia_sdp_media_find_attr2(remote, "recvonly", NULL) != NULL) {
/* If remote has "a=recvonly", then set local to "sendonly" if
* it is currently "sendrecv". Otherwise if local is NOT "sendonly",
* then set local direction to "inactive"
*/
switch (old_dir) {
case PJMEDIA_DIR_ENCODING_DECODING:
new_dir = PJMEDIA_DIR_ENCODING;
break;
case PJMEDIA_DIR_ENCODING:
/* No change */
break;
default:
new_dir = PJMEDIA_DIR_NONE;
break;
}
} else {
/* Remote indicates "sendrecv" capability. No change to local
* direction
*/
}
if (new_dir != old_dir) {
pjmedia_sdp_attr *a = NULL;
remove_all_media_directions(local);
switch (new_dir) {
case PJMEDIA_DIR_NONE:
a = pjmedia_sdp_attr_create(pool, "inactive", NULL);
break;
case PJMEDIA_DIR_ENCODING:
a = pjmedia_sdp_attr_create(pool, "sendonly", NULL);
break;
case PJMEDIA_DIR_DECODING:
a = pjmedia_sdp_attr_create(pool, "recvonly", NULL);
break;
default:
/* sendrecv */
break;
}
if (a) {
pjmedia_sdp_media_add_attr(local, a);
}
}
}
/*
* The encode_sdp() is called when we're about to send SDP to remote party,
* either as SDP offer or as SDP answer.
*/
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *local_sdp,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
struct tp_zrtp *zrtp = (struct tp_zrtp*)tp;
int32_t numVersions, i;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
/* If "rem_sdp" is not NULL, it means we're encoding SDP answer. You may
* do some more checking on the SDP's once again to make sure that
* everything is okay before we send SDP.
*/
if (rem_sdp)
{
/* Do checking stuffs here.. */
}
/* Add zrtp-hash attributes to both INVITE and 200 OK. */
numVersions = zrtp_getNumberSupportedVersions(zrtp->zrtpCtx);
for (i = 0; i < numVersions; i++) {
char *zrtp_hello_hash = zrtp_getHelloHash(zrtp->zrtpCtx, i);
if (zrtp_hello_hash && *zrtp_hello_hash) {
int zrtp_hello_hash_len = strlen(zrtp_hello_hash);
pj_str_t *zrtp_hash_str = PJ_POOL_ALLOC_T(sdp_pool, pj_str_t);
pjmedia_sdp_attr *zrtp_hash = NULL;
zrtp_hash_str->ptr = zrtp_hello_hash;
zrtp_hash_str->slen = zrtp_hello_hash_len;
zrtp_hash = pjmedia_sdp_attr_create(sdp_pool, "zrtp-hash", zrtp_hash_str);
if (zrtp_hash &&
pjmedia_sdp_attr_add(&local_sdp->media[media_index]->attr_count, local_sdp->media[media_index]->attr, zrtp_hash) == PJ_SUCCESS) {
PJ_LOG(4, (THIS_FILE, "attribute added: a=zrtp-hash:%s", zrtp_hello_hash));
}
else {
PJ_LOG(4, (THIS_FILE, "error adding attribute: a=zrtp-hash:%s", zrtp_hello_hash));
}
}
}
/* You may do anything to the local_sdp, e.g. adding new attributes, or
* even modifying the SDP if you want.
*/
if (0)
{
/* Say we add a proprietary attribute here.. */
pjmedia_sdp_attr *my_attr;
my_attr = PJ_POOL_ALLOC_T(sdp_pool, pjmedia_sdp_attr);
pj_strdup2(sdp_pool, &my_attr->name, "X-zrtp");
pj_strdup2(sdp_pool, &my_attr->value, "some value");
pjmedia_sdp_attr_add(&local_sdp->media[media_index]->attr_count,
local_sdp->media[media_index]->attr,
my_attr);
}
/* And then pass the call to slave transport to let it encode its
* information in the SDP. You may choose to call encode_sdp() to slave
* first before adding your custom attributes if you want.
*/
return pjmedia_transport_encode_sdp(zrtp->slave_tp, sdp_pool, local_sdp, rem_sdp, media_index);
}
/*! \brief Function which creates an outgoing stream */
static int create_outgoing_sdp_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
struct pjmedia_sdp_session *sdp)
{
pj_pool_t *pool = session->inv_session->pool_prov;
static const pj_str_t STR_IN = { "IN", 2 };
static const pj_str_t STR_IP4 = { "IP4", 3};
static const pj_str_t STR_IP6 = { "IP6", 3};
static const pj_str_t STR_UDPTL = { "udptl", 5 };
static const pj_str_t STR_T38 = { "t38", 3 };
static const pj_str_t STR_TRANSFERREDTCF = { "transferredTCF", 14 };
static const pj_str_t STR_LOCALTCF = { "localTCF", 8 };
static const pj_str_t STR_T38UDPFEC = { "t38UDPFEC", 9 };
static const pj_str_t STR_T38UDPREDUNDANCY = { "t38UDPRedundancy", 16 };
struct t38_state *state;
pjmedia_sdp_media *media;
const char *hostip = NULL;
struct ast_sockaddr addr;
char tmp[512];
pj_str_t stmp;
if (!session->endpoint->media.t38.enabled) {
return 1;
} else if ((session->t38state != T38_LOCAL_REINVITE) && (session->t38state != T38_PEER_REINVITE) &&
(session->t38state != T38_ENABLED)) {
return 1;
} else if (!(state = t38_state_get_or_alloc(session))) {
return -1;
} else if (t38_initialize_session(session, session_media)) {
return -1;
}
if (!(media = pj_pool_zalloc(pool, sizeof(struct pjmedia_sdp_media))) ||
!(media->conn = pj_pool_zalloc(pool, sizeof(struct pjmedia_sdp_conn)))) {
return -1;
}
media->desc.media = pj_str(session_media->stream_type);
media->desc.transport = STR_UDPTL;
if (ast_strlen_zero(session->endpoint->media.address)) {
hostip = ast_sip_get_host_ip_string(session->endpoint->media.t38.ipv6 ? pj_AF_INET6() : pj_AF_INET());
} else {
hostip = session->endpoint->media.address;
}
if (ast_strlen_zero(hostip)) {
return -1;
}
media->conn->net_type = STR_IN;
media->conn->addr_type = session->endpoint->media.t38.ipv6 ? STR_IP6 : STR_IP4;
pj_strdup2(pool, &media->conn->addr, hostip);
ast_udptl_get_us(session_media->udptl, &addr);
media->desc.port = (pj_uint16_t) ast_sockaddr_port(&addr);
media->desc.port_count = 1;
media->desc.fmt[media->desc.fmt_count++] = STR_T38;
snprintf(tmp, sizeof(tmp), "%u", state->our_parms.version);
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxVersion", pj_cstr(&stmp, tmp));
snprintf(tmp, sizeof(tmp), "%u", t38_get_rate(state->our_parms.rate));
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38MaxBitRate", pj_cstr(&stmp, tmp));
if (state->our_parms.fill_bit_removal) {
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxFillBitRemoval", NULL);
}
if (state->our_parms.transcoding_mmr) {
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxTranscodingMMR", NULL);
}
if (state->our_parms.transcoding_jbig) {
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxTranscodingJBIG", NULL);
}
switch (state->our_parms.rate_management) {
case AST_T38_RATE_MANAGEMENT_TRANSFERRED_TCF:
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxRateManagement", &STR_TRANSFERREDTCF);
break;
case AST_T38_RATE_MANAGEMENT_LOCAL_TCF:
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxRateManagement", &STR_LOCALTCF);
break;
}
snprintf(tmp, sizeof(tmp), "%u", ast_udptl_get_local_max_datagram(session_media->udptl));
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxMaxDatagram", pj_cstr(&stmp, tmp));
switch (ast_udptl_get_error_correction_scheme(session_media->udptl)) {
case UDPTL_ERROR_CORRECTION_NONE:
break;
case UDPTL_ERROR_CORRECTION_FEC:
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxUdpEC", &STR_T38UDPFEC);
break;
case UDPTL_ERROR_CORRECTION_REDUNDANCY:
media->attr[media->attr_count++] = pjmedia_sdp_attr_create(pool, "T38FaxUdpEC", &STR_T38UDPREDUNDANCY);
break;
}
sdp->media[sdp->media_count++] = media;
return 1;
}
/* Encode ICE information in SDP */
static pj_status_t encode_session_in_sdp(struct transport_ice *tp_ice,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
unsigned media_index,
unsigned comp_cnt,
pj_bool_t restart_session)
{
enum {
ATTR_BUF_LEN = 160, /* Max len of a=candidate attr */
RATTR_BUF_LEN= 160 /* Max len of a=remote-candidates attr */
};
pjmedia_sdp_media *m = sdp_local->media[media_index];
pj_str_t local_ufrag, local_pwd;
pjmedia_sdp_attr *attr;
pj_status_t status;
/* Must have a session */
PJ_ASSERT_RETURN(pj_ice_strans_has_sess(tp_ice->ice_st), PJ_EBUG);
/* Get ufrag and pwd from current session */
pj_ice_strans_get_ufrag_pwd(tp_ice->ice_st, &local_ufrag, &local_pwd,
NULL, NULL);
/* The listing of candidates depends on whether ICE has completed
* or not. When ICE has completed:
*
* 9.1.2.2: Existing Media Streams with ICE Completed
* The agent MUST include a candidate attributes for candidates
* matching the default destination for each component of the
* media stream, and MUST NOT include any other candidates.
*
* When ICE has not completed, we shall include all candidates.
*
* Except when we have detected that remote is offering to restart
* the session, in this case we will answer with full ICE SDP and
* new ufrag/pwd pair.
*/
if (!restart_session && pj_ice_strans_sess_is_complete(tp_ice->ice_st)) {
const pj_ice_sess_check *check;
char *attr_buf;
pjmedia_sdp_conn *conn;
pjmedia_sdp_attr *a_rtcp;
pj_str_t rem_cand;
unsigned comp;
/* Encode ice-ufrag attribute */
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_UFRAG.ptr,
&local_ufrag);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
/* Encode ice-pwd attribute */
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_PWD.ptr,
&local_pwd);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
/* Prepare buffer */
attr_buf = (char*) pj_pool_alloc(sdp_pool, ATTR_BUF_LEN);
rem_cand.ptr = (char*) pj_pool_alloc(sdp_pool, RATTR_BUF_LEN);
rem_cand.slen = 0;
/* 9.1.2.2: Existing Media Streams with ICE Completed
* The default destination for media (i.e., the values of
* the IP addresses and ports in the m and c line used for
* that media stream) MUST be the local candidate from the
* highest priority nominated pair in the valid list for each
* component.
*/
check = pj_ice_strans_get_valid_pair(tp_ice->ice_st, 1);
if (check == NULL) {
pj_assert(!"Shouldn't happen");
return PJ_EBUG;
}
/* Override connection line address and media port number */
conn = m->conn;
if (conn == NULL)
conn = sdp_local->conn;
conn->addr.ptr = (char*) pj_pool_alloc(sdp_pool,
PJ_INET6_ADDRSTRLEN);
pj_sockaddr_print(&check->lcand->addr, conn->addr.ptr,
PJ_INET6_ADDRSTRLEN, 0);
conn->addr.slen = pj_ansi_strlen(conn->addr.ptr);
m->desc.port = pj_sockaddr_get_port(&check->lcand->addr);
/* Override address RTCP attribute if it's present */
if (comp_cnt == 2 &&
(check = pj_ice_strans_get_valid_pair(tp_ice->ice_st,
COMP_RTCP)) != NULL &&
(a_rtcp = pjmedia_sdp_attr_find(m->attr_count, m->attr,
&STR_RTCP, 0)) != NULL)
{
pjmedia_sdp_attr_remove(&m->attr_count, m->attr, a_rtcp);
a_rtcp = pjmedia_sdp_attr_create_rtcp(sdp_pool,
&check->lcand->addr);
if (a_rtcp)
pjmedia_sdp_attr_add(&m->attr_count, m->attr, a_rtcp);
}
/* Encode only candidates matching the default destination
* for each component
*/
for (comp=0; comp < comp_cnt; ++comp) {
int len;
pj_str_t value;
/* Get valid pair for this component */
check = pj_ice_strans_get_valid_pair(tp_ice->ice_st, comp+1);
if (check == NULL)
continue;
/* Print and add local candidate in the pair */
value.ptr = attr_buf;
value.slen = print_sdp_cand_attr(attr_buf, ATTR_BUF_LEN,
check->lcand);
if (value.slen < 0) {
pj_assert(!"Not enough attr_buf to print candidate");
return PJ_EBUG;
}
attr = pjmedia_sdp_attr_create(sdp_pool, STR_CANDIDATE.ptr,
&value);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
/* Append to a=remote-candidates attribute */
if (pj_ice_strans_get_role(tp_ice->ice_st) ==
PJ_ICE_SESS_ROLE_CONTROLLING)
{
char rem_addr[PJ_INET6_ADDRSTRLEN];
pj_sockaddr_print(&check->rcand->addr, rem_addr,
sizeof(rem_addr), 0);
len = pj_ansi_snprintf(
rem_cand.ptr + rem_cand.slen,
RATTR_BUF_LEN - rem_cand.slen,
"%s%u %s %u",
(rem_cand.slen==0? "" : " "),
comp+1, rem_addr,
pj_sockaddr_get_port(&check->rcand->addr)
);
if (len < 1 || len >= RATTR_BUF_LEN) {
pj_assert(!"Not enough buffer to print "
"remote-candidates");
return PJ_EBUG;
}
rem_cand.slen += len;
}
}
/* 9.1.2.2: Existing Media Streams with ICE Completed
* In addition, if the agent is controlling, it MUST include
* the a=remote-candidates attribute for each media stream
* whose check list is in the Completed state. The attribute
* contains the remote candidates from the highest priority
* nominated pair in the valid list for each component of that
* media stream.
*/
if (pj_ice_strans_get_role(tp_ice->ice_st) ==
PJ_ICE_SESS_ROLE_CONTROLLING)
{
attr = pjmedia_sdp_attr_create(sdp_pool, STR_REM_CAND.ptr,
&rem_cand);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
}
} else if (pj_ice_strans_has_sess(tp_ice->ice_st)) {
/* Encode all candidates to SDP media */
char *attr_buf;
unsigned comp;
/* If ICE is not restarted, encode current ICE ufrag/pwd.
* Otherwise generate new one.
*/
if (!restart_session) {
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_UFRAG.ptr,
&local_ufrag);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_PWD.ptr,
&local_pwd);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
} else {
pj_str_t str;
str.slen = PJ_ICE_UFRAG_LEN;
str.ptr = (char*) pj_pool_alloc(sdp_pool, str.slen);
pj_create_random_string(str.ptr, str.slen);
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_UFRAG.ptr, &str);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
str.ptr = (char*) pj_pool_alloc(sdp_pool, str.slen);
pj_create_random_string(str.ptr, str.slen);
attr = pjmedia_sdp_attr_create(sdp_pool, STR_ICE_PWD.ptr, &str);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
}
/* Create buffer to encode candidates as SDP attribute */
attr_buf = (char*) pj_pool_alloc(sdp_pool, ATTR_BUF_LEN);
for (comp=0; comp < comp_cnt; ++comp) {
unsigned cand_cnt;
pj_ice_sess_cand cand[PJ_ICE_ST_MAX_CAND];
unsigned i;
cand_cnt = PJ_ARRAY_SIZE(cand);
status = pj_ice_strans_enum_cands(tp_ice->ice_st, comp+1,
&cand_cnt, cand);
if (status != PJ_SUCCESS)
return status;
for (i=0; i<cand_cnt; ++i) {
pj_str_t value;
value.slen = print_sdp_cand_attr(attr_buf, ATTR_BUF_LEN,
&cand[i]);
if (value.slen < 0) {
pj_assert(!"Not enough attr_buf to print candidate");
return PJ_EBUG;
}
value.ptr = attr_buf;
attr = pjmedia_sdp_attr_create(sdp_pool,
STR_CANDIDATE.ptr,
&value);
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
}
}
} else {
/* ICE has failed, application should have terminated this call */
}
/* Removing a=rtcp line when there is only one component. */
if (comp_cnt == 1) {
attr = pjmedia_sdp_attr_find(m->attr_count, m->attr, &STR_RTCP, NULL);
if (attr)
pjmedia_sdp_attr_remove(&m->attr_count, m->attr, attr);
}
return PJ_SUCCESS;
}
void Sdp::addAttributeToLocalAudioMedia(const char *attr)
{
if (localSession_)
pjmedia_sdp_media_add_attr(localSession_->media[0], pjmedia_sdp_attr_create(memPool_, attr, NULL));
}
