/*! \brief Function which applies a negotiated stream */
static int apply_negotiated_sdp_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
const struct pjmedia_sdp_session *local, const struct pjmedia_sdp_media *local_stream,
const struct pjmedia_sdp_session *remote, const struct pjmedia_sdp_media *remote_stream)
{
RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
char host[NI_MAXHOST];
struct t38_state *state;
if (!session_media->udptl) {
return 0;
}
if (!(state = t38_state_get_or_alloc(session))) {
return -1;
}
ast_copy_pj_str(host, remote_stream->conn ? &remote_stream->conn->addr : &remote->conn->addr, sizeof(host));
/* Ensure that the address provided is valid */
if (ast_sockaddr_resolve(&addrs, host, PARSE_PORT_FORBID, AST_AF_UNSPEC) <= 0) {
/* The provided host was actually invalid so we error out this negotiation */
return -1;
}
ast_sockaddr_set_port(addrs, remote_stream->desc.port);
ast_udptl_set_peer(session_media->udptl, addrs);
t38_interpret_sdp(state, session, session_media, remote_stream);
return 0;
}
/*! \brief Function which negotiates an incoming media stream */
static int negotiate_incoming_sdp_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
const struct pjmedia_sdp_session *sdp, const struct pjmedia_sdp_media *stream)
{
char host[NI_MAXHOST];
RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free_ptr);
enum ast_format_type media_type = stream_to_media_type(session_media->stream_type);
/* If no type formats have been configured reject this stream */
if (!ast_format_cap_has_type(session->endpoint->media.codecs, media_type)) {
return 0;
}
/* Ensure incoming transport is compatible with the endpoint's configuration */
if (!session->endpoint->media.rtp.use_received_transport &&
check_endpoint_media_transport(session->endpoint, stream) == AST_SIP_MEDIA_TRANSPORT_INVALID) {
return -1;
}
ast_copy_pj_str(host, stream->conn ? &stream->conn->addr : &sdp->conn->addr, sizeof(host));
/* Ensure that the address provided is valid */
if (ast_sockaddr_resolve(&addrs, host, PARSE_PORT_FORBID, AST_AF_UNSPEC) <= 0) {
/* The provided host was actually invalid so we error out this negotiation */
return -1;
}
/* Using the connection information create an appropriate RTP instance */
if (!session_media->rtp && create_rtp(session, session_media, ast_sockaddr_is_ipv6(addrs))) {
return -1;
}
if (session->endpoint->media.rtp.use_received_transport) {
pj_strdup(session->inv_session->pool, &session_media->transport, &stream->desc.transport);
}
if (setup_media_encryption(session, session_media, stream)) {
return -1;
}
if (set_caps(session, session_media, stream)) {
return -1;
}
if (media_type == AST_FORMAT_TYPE_AUDIO) {
apply_packetization(session, session_media, stream);
}
return 1;
}
static int extract_contact_addr(pjsip_contact_hdr *contact, struct ast_sockaddr **addrs)
{
pjsip_sip_uri *sip_uri;
char host[256];
if (!contact || contact->star) {
*addrs = NULL;
return 0;
}
if (!PJSIP_URI_SCHEME_IS_SIP(contact->uri) && !PJSIP_URI_SCHEME_IS_SIPS(contact->uri)) {
*addrs = NULL;
return 0;
}
sip_uri = pjsip_uri_get_uri(contact->uri);
ast_copy_pj_str(host, &sip_uri->host, sizeof(host));
return ast_sockaddr_resolve(addrs, host, PARSE_PORT_FORBID, AST_AF_UNSPEC);
}
/*! \brief Return the first entry from ast_sockaddr_resolve filtered by address family
*
* \warning Using this function probably means you have a faulty design.
* \note This function was taken from the function of the same name in chan_sip.c
*/
static int ast_sockaddr_resolve_first_af(struct ast_sockaddr *addr,
const char* name, int flag, int family)
{
struct ast_sockaddr *addrs;
int addrs_cnt;
addrs_cnt = ast_sockaddr_resolve(&addrs, name, flag, family);
if (addrs_cnt <= 0) {
return 1;
}
if (addrs_cnt > 1) {
ast_debug(1, "Multiple addresses, using the first one only\n");
}
ast_sockaddr_copy(addr, &addrs[0]);
ast_free(addrs);
return 0;
}
/*! \brief Function which negotiates an incoming media stream */
static int negotiate_incoming_sdp_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
const struct pjmedia_sdp_session *sdp, const struct pjmedia_sdp_media *stream)
{
struct t38_state *state;
char host[NI_MAXHOST];
RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
if (!session->endpoint->media.t38.enabled) {
ast_debug(3, "Declining; T.38 not enabled on session\n");
return -1;
}
if (!(state = t38_state_get_or_alloc(session))) {
return -1;
}
if ((session->t38state == T38_REJECTED) || (session->t38state == T38_DISABLED)) {
ast_debug(3, "Declining; T.38 state is rejected or declined\n");
t38_change_state(session, session_media, state, T38_DISABLED);
return -1;
}
ast_copy_pj_str(host, stream->conn ? &stream->conn->addr : &sdp->conn->addr, sizeof(host));
/* Ensure that the address provided is valid */
if (ast_sockaddr_resolve(&addrs, host, PARSE_PORT_FORBID, AST_AF_INET) <= 0) {
/* The provided host was actually invalid so we error out this negotiation */
ast_debug(3, "Declining; provided host is invalid\n");
return -1;
}
/* Check the address family to make sure it matches configured */
if ((ast_sockaddr_is_ipv6(addrs) && !session->endpoint->media.t38.ipv6) ||
(ast_sockaddr_is_ipv4(addrs) && session->endpoint->media.t38.ipv6)) {
/* The address does not match configured */
ast_debug(3, "Declining, provided host does not match configured address family\n");
return -1;
}
return 1;
}
/*! \brief Function which negotiates an incoming media stream */
static int negotiate_incoming_sdp_stream(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
const struct pjmedia_sdp_session *sdp, const struct pjmedia_sdp_media *stream)
{
char host[NI_MAXHOST];
RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
enum ast_media_type media_type = stream_to_media_type(session_media->stream_type);
enum ast_sip_session_media_encryption encryption = AST_SIP_MEDIA_ENCRYPT_NONE;
int res;
/* If port is 0, ignore this media stream */
if (!stream->desc.port) {
ast_debug(3, "Media stream '%s' is already declined\n", session_media->stream_type);
return 0;
}
/* If no type formats have been configured reject this stream */
if (!ast_format_cap_has_type(session->endpoint->media.codecs, media_type)) {
ast_debug(3, "Endpoint has no codecs for media type '%s', declining stream\n", session_media->stream_type);
return 0;
}
/* Ensure incoming transport is compatible with the endpoint's configuration */
if (!session->endpoint->media.rtp.use_received_transport) {
encryption = check_endpoint_media_transport(session->endpoint, stream);
if (encryption == AST_SIP_MEDIA_TRANSPORT_INVALID) {
return -1;
}
}
ast_copy_pj_str(host, stream->conn ? &stream->conn->addr : &sdp->conn->addr, sizeof(host));
/* Ensure that the address provided is valid */
if (ast_sockaddr_resolve(&addrs, host, PARSE_PORT_FORBID, AST_AF_UNSPEC) <= 0) {
/* The provided host was actually invalid so we error out this negotiation */
return -1;
}
/* Using the connection information create an appropriate RTP instance */
if (!session_media->rtp && create_rtp(session, session_media, ast_sockaddr_is_ipv6(addrs))) {
return -1;
}
res = setup_media_encryption(session, session_media, sdp, stream);
if (res) {
if (!session->endpoint->media.rtp.encryption_optimistic) {
/* If optimistic encryption is disabled and crypto should have been enabled
* but was not this session must fail.
*/
return -1;
}
/* There is no encryption, sad. */
session_media->encryption = AST_SIP_MEDIA_ENCRYPT_NONE;
}
/* If we've been explicitly configured to use the received transport OR if
* encryption is on and crypto is present use the received transport.
* This is done in case of optimistic because it may come in as RTP/AVP or RTP/SAVP depending
* on the configuration of the remote endpoint (optimistic themselves or mandatory).
*/
if ((session->endpoint->media.rtp.use_received_transport) ||
((encryption == AST_SIP_MEDIA_ENCRYPT_SDES) && !res)) {
pj_strdup(session->inv_session->pool, &session_media->transport, &stream->desc.transport);
}
if (set_caps(session, session_media, stream)) {
return 0;
}
return 1;
}