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/* $Id$ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/transport_ice.h>
#include <pjnath/errno.h>
#include <pj/assert.h>
#include <pj/log.h>
#include <pj/pool.h>
#include <pj/rand.h>
#define THIS_FILE "transport_ice.c"
#if 0
# define TRACE__(expr) PJ_LOG(5,expr)
#else
# define TRACE__(expr)
#endif
enum oa_role
{
ROLE_NONE,
ROLE_OFFERER,
ROLE_ANSWERER
};
struct sdp_state
{
unsigned match_comp_cnt; /* Matching number of components */
pj_bool_t ice_mismatch; /* Address doesn't match candidates */
pj_bool_t ice_restart; /* Offer to restart ICE */
pj_ice_sess_role local_role; /* Our role */
};
struct transport_ice
{
pjmedia_transport base;
pj_pool_t *pool;
int af;
unsigned options; /**< Transport options. */
unsigned comp_cnt;
pj_ice_strans *ice_st;
pjmedia_ice_cb cb;
unsigned media_option;
pj_bool_t initial_sdp;
enum oa_role oa_role; /**< Last role in SDP offer/answer */
struct sdp_state rem_offer_state;/**< Describes the remote offer */
void *stream;
pj_sockaddr remote_rtp;
pj_sockaddr remote_rtcp;
unsigned addr_len; /**< Length of addresses. */
pj_bool_t use_ice;
pj_sockaddr rtp_src_addr; /**< Actual source RTP address. */
pj_sockaddr rtcp_src_addr; /**< Actual source RTCP address. */
unsigned rtp_src_cnt; /**< How many pkt from this addr. */
unsigned rtcp_src_cnt; /**< How many pkt from this addr. */
unsigned tx_drop_pct; /**< Percent of tx pkts to drop. */
unsigned rx_drop_pct; /**< Percent of rx pkts to drop. */
void (*rtp_cb)(void*,
void*,
pj_ssize_t);
void (*rtcp_cb)(void*,
void*,
pj_ssize_t);
};
/*
* These are media transport operations.
*/
static pj_status_t transport_get_info (pjmedia_transport *tp,
pjmedia_transport_info *info);
static pj_status_t transport_attach (pjmedia_transport *tp,
void *user_data,
const pj_sockaddr_t *rem_addr,
const pj_sockaddr_t *rem_rtcp,
unsigned addr_len,
void (*rtp_cb)(void*,
void*,
pj_ssize_t),
void (*rtcp_cb)(void*,
void*,
pj_ssize_t));
static void transport_detach (pjmedia_transport *tp,
void *strm);
static pj_status_t transport_send_rtp( pjmedia_transport *tp,
const void *pkt,
pj_size_t size);
static pj_status_t transport_send_rtcp(pjmedia_transport *tp,
const void *pkt,
pj_size_t size);
static pj_status_t transport_send_rtcp2(pjmedia_transport *tp,
const pj_sockaddr_t *addr,
unsigned addr_len,
const void *pkt,
pj_size_t size);
static pj_status_t transport_media_create(pjmedia_transport *tp,
pj_pool_t *pool,
unsigned options,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index);
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *tmp_pool,
pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index);
static pj_status_t transport_media_start(pjmedia_transport *tp,
pj_pool_t *pool,
const pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index);
static pj_status_t transport_media_stop(pjmedia_transport *tp);
static pj_status_t transport_simulate_lost(pjmedia_transport *tp,
pjmedia_dir dir,
unsigned pct_lost);
static pj_status_t transport_destroy (pjmedia_transport *tp);
/*
* And these are ICE callbacks.
*/
static void ice_on_rx_data(pj_ice_strans *ice_st,
unsigned comp_id,
void *pkt, pj_size_t size,
const pj_sockaddr_t *src_addr,
unsigned src_addr_len);
static void ice_on_ice_complete(pj_ice_strans *ice_st,
pj_ice_strans_op op,
pj_status_t status);
static pjmedia_transport_op transport_ice_op =
{
&transport_get_info,
&transport_attach,
&transport_detach,
&transport_send_rtp,
&transport_send_rtcp,
&transport_send_rtcp2,
&transport_media_create,
&transport_encode_sdp,
&transport_media_start,
&transport_media_stop,
&transport_simulate_lost,
&transport_destroy
};
static const pj_str_t STR_RTP_AVP = { "RTP/AVP", 7 };
static const pj_str_t STR_CANDIDATE = { "candidate", 9};
static const pj_str_t STR_REM_CAND = { "remote-candidates", 17 };
static const pj_str_t STR_ICE_LITE = { "ice-lite", 8};
static const pj_str_t STR_ICE_MISMATCH = { "ice-mismatch", 12};
static const pj_str_t STR_ICE_UFRAG = { "ice-ufrag", 9 };
static const pj_str_t STR_ICE_PWD = { "ice-pwd", 7 };
static const pj_str_t STR_IP4 = { "IP4", 3 };
static const pj_str_t STR_IP6 = { "IP6", 3 };
static const pj_str_t STR_RTCP = { "rtcp", 4 };
static const pj_str_t STR_BANDW_RR = { "RR", 2 };
static const pj_str_t STR_BANDW_RS = { "RS", 2 };
enum {
COMP_RTP = 1,
COMP_RTCP = 2
};
/*
* Create ICE media transport.
*/
PJ_DEF(pj_status_t) pjmedia_ice_create(pjmedia_endpt *endpt,
const char *name,
unsigned comp_cnt,
const pj_ice_strans_cfg *cfg,
const pjmedia_ice_cb *cb,
pjmedia_transport **p_tp)
{
return pjmedia_ice_create2(endpt, name, comp_cnt, cfg, cb, 0, p_tp);
}
/*
* Create ICE media transport.
*/
PJ_DEF(pj_status_t) pjmedia_ice_create2(pjmedia_endpt *endpt,
const char *name,
unsigned comp_cnt,
const pj_ice_strans_cfg *cfg,
const pjmedia_ice_cb *cb,
unsigned options,
pjmedia_transport **p_tp)
{
return pjmedia_ice_create3(endpt, name, comp_cnt, cfg, cb,
options, NULL, p_tp);
}
/*
* Create ICE media transport.
*/
PJ_DEF(pj_status_t) pjmedia_ice_create3(pjmedia_endpt *endpt,
const char *name,
unsigned comp_cnt,
const pj_ice_strans_cfg *cfg,
const pjmedia_ice_cb *cb,
unsigned options,
void *user_data,
pjmedia_transport **p_tp)
{
pj_pool_t *pool;
pj_ice_strans_cb ice_st_cb;
pj_ice_strans_cfg ice_st_cfg;
struct transport_ice *tp_ice;
pj_status_t status;
PJ_ASSERT_RETURN(endpt && comp_cnt && cfg && p_tp, PJ_EINVAL);
/* Create transport instance */
pool = pjmedia_endpt_create_pool(endpt, name, 512, 512);
tp_ice = PJ_POOL_ZALLOC_T(pool, struct transport_ice);
tp_ice->pool = pool;
tp_ice->af = cfg->af;
tp_ice->options = options;
tp_ice->comp_cnt = comp_cnt;
pj_ansi_strcpy(tp_ice->base.name, pool->obj_name);
tp_ice->base.op = &transport_ice_op;
tp_ice->base.type = PJMEDIA_TRANSPORT_TYPE_ICE;
tp_ice->base.user_data = user_data;
tp_ice->initial_sdp = PJ_TRUE;
tp_ice->oa_role = ROLE_NONE;
tp_ice->use_ice = PJ_FALSE;
pj_memcpy(&ice_st_cfg, cfg, sizeof(pj_ice_strans_cfg));
if (cb)
pj_memcpy(&tp_ice->cb, cb, sizeof(pjmedia_ice_cb));
/* Assign return value first because ICE might call callback
* in create()
*/
*p_tp = &tp_ice->base;
/* Configure ICE callbacks */
pj_bzero(&ice_st_cb, sizeof(ice_st_cb));
ice_st_cb.on_ice_complete = &ice_on_ice_complete;
ice_st_cb.on_rx_data = &ice_on_rx_data;
/* Configure RTP socket buffer settings, if not set */
if (ice_st_cfg.comp[COMP_RTP-1].so_rcvbuf_size == 0) {
ice_st_cfg.comp[COMP_RTP-1].so_rcvbuf_size =
PJMEDIA_TRANSPORT_SO_RCVBUF_SIZE;
}
if (ice_st_cfg.comp[COMP_RTP-1].so_sndbuf_size == 0) {
ice_st_cfg.comp[COMP_RTP-1].so_sndbuf_size =
PJMEDIA_TRANSPORT_SO_SNDBUF_SIZE;
}
/* Create ICE */
status = pj_ice_strans_create(name, &ice_st_cfg, comp_cnt, tp_ice,
&ice_st_cb, &tp_ice->ice_st);
if (status != PJ_SUCCESS) {
pj_pool_release(pool);
*p_tp = NULL;
return status;
}
/* Done */
return PJ_SUCCESS;
}
PJ_DEF(pj_grp_lock_t *) pjmedia_ice_get_grp_lock(pjmedia_transport *tp)
{
PJ_ASSERT_RETURN(tp, NULL);
return pj_ice_strans_get_grp_lock(((struct transport_ice *)tp)->ice_st);
}
/* Disable ICE when SDP from remote doesn't contain a=candidate line */
static void set_no_ice(struct transport_ice *tp_ice, const char *reason,
pj_status_t err)
{
if (err != PJ_SUCCESS) {
char errmsg[PJ_ERR_MSG_SIZE];
pj_strerror(err, errmsg, sizeof(errmsg));
PJ_LOG(4,(tp_ice->base.name,
"Stopping ICE, reason=%s:%s", reason, errmsg));
} else {
PJ_LOG(4,(tp_ice->base.name,
"Stopping ICE, reason=%s", reason));
}
if (tp_ice->ice_st) {
pj_ice_strans_stop_ice(tp_ice->ice_st);
}
tp_ice->use_ice = PJ_FALSE;
}
/* Create SDP candidate attribute */
static int print_sdp_cand_attr(char *buffer, int max_len,
const pj_ice_sess_cand *cand)
{
char ipaddr[PJ_INET6_ADDRSTRLEN+2];
int len, len2;
len = pj_ansi_snprintf( buffer, max_len,
"%.*s %u UDP %u %s %u typ ",
(int)cand->foundation.slen,
cand->foundation.ptr,
(unsigned)cand->comp_id,
cand->prio,
pj_sockaddr_print(&cand->addr, ipaddr,
sizeof(ipaddr), 0),
(unsigned)pj_sockaddr_get_port(&cand->addr));
if (len < 1 || len >= max_len)
return -1;
switch (cand->type) {
case PJ_ICE_CAND_TYPE_HOST:
len2 = pj_ansi_snprintf(buffer+len, max_len-len, "host");
break;
case PJ_ICE_CAND_TYPE_SRFLX:
case PJ_ICE_CAND_TYPE_RELAYED:
case PJ_ICE_CAND_TYPE_PRFLX:
len2 = pj_ansi_snprintf(buffer+len, max_len-len,
"%s raddr %s rport %d",
pj_ice_get_cand_type_name(cand->type),
pj_sockaddr_print(&cand->rel_addr, ipaddr,
sizeof(ipaddr), 0),
(int)pj_sockaddr_get_port(&cand->rel_addr));
break;
default:
pj_assert(!"Invalid candidate type");
len2 = -1;
break;
}
if (len2 < 1 || len2 >= max_len-len)
return -1;
return len+len2;
}
/* Get ice-ufrag and ice-pwd attribute */
static void get_ice_attr(const pjmedia_sdp_session *rem_sdp,
const pjmedia_sdp_media *rem_m,
const pjmedia_sdp_attr **p_ice_ufrag,
const pjmedia_sdp_attr **p_ice_pwd)
{
pjmedia_sdp_attr *attr;
/* Find ice-ufrag attribute in media descriptor */
attr = pjmedia_sdp_attr_find(rem_m->attr_count, rem_m->attr,
&STR_ICE_UFRAG, NULL);
if (attr == NULL) {
/* Find ice-ufrag attribute in session descriptor */
attr = pjmedia_sdp_attr_find(rem_sdp->attr_count, rem_sdp->attr,
&STR_ICE_UFRAG, NULL);
}
*p_ice_ufrag = attr;
/* Find ice-pwd attribute in media descriptor */
attr = pjmedia_sdp_attr_find(rem_m->attr_count, rem_m->attr,
&STR_ICE_PWD, NULL);
if (attr == NULL) {
/* Find ice-pwd attribute in session descriptor */
attr = pjmedia_sdp_attr_find(rem_sdp->attr_count, rem_sdp->attr,
&STR_ICE_PWD, NULL);
}
*p_ice_pwd = attr;
}
/* Encode and add "a=ice-mismatch" attribute in the SDP */
static void encode_ice_mismatch(pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
unsigned media_index)
{
pjmedia_sdp_attr *attr;
pjmedia_sdp_media *m = sdp_local->media[media_index];
attr = PJ_POOL_ALLOC_T(sdp_pool, pjmedia_sdp_attr);
attr->name = STR_ICE_MISMATCH;
attr->value.slen = 0;
pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr);
}
/* 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) &&
pj_ice_strans_get_state(tp_ice->ice_st) != PJ_ICE_STRANS_STATE_FAILED)
{
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 - rem_cand.slen) {
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) &&
pj_ice_strans_get_state(tp_ice->ice_st) !=
PJ_ICE_STRANS_STATE_FAILED)
{
/* 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);
/* If RTCP is not in use, we MUST send b=RS:0 and b=RR:0. */
pj_assert(m->bandw_count + 2 <= PJ_ARRAY_SIZE(m->bandw));
if (m->bandw_count + 2 <= PJ_ARRAY_SIZE(m->bandw)) {
m->bandw[m->bandw_count] = PJ_POOL_ZALLOC_T(sdp_pool,
pjmedia_sdp_bandw);
pj_memcpy(&m->bandw[m->bandw_count]->modifier, &STR_BANDW_RS,
sizeof(pj_str_t));
m->bandw_count++;
m->bandw[m->bandw_count] = PJ_POOL_ZALLOC_T(sdp_pool,
pjmedia_sdp_bandw);
pj_memcpy(&m->bandw[m->bandw_count]->modifier, &STR_BANDW_RR,
sizeof(pj_str_t));
m->bandw_count++;
}
}
return PJ_SUCCESS;
}
/* Parse a=candidate line */
static pj_status_t parse_cand(const char *obj_name,
pj_pool_t *pool,
const pj_str_t *orig_input,
pj_ice_sess_cand *cand)
{
pj_str_t input;
char *token, *host;
int af;
pj_str_t s;
pj_status_t status = PJNATH_EICEINCANDSDP;
pj_bzero(cand, sizeof(*cand));
pj_strdup_with_null(pool, &input, orig_input);
PJ_UNUSED_ARG(obj_name);
/* Foundation */
token = strtok(input.ptr, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE foundation in candidate"));
goto on_return;
}
pj_strdup2(pool, &cand->foundation, token);
/* Component ID */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE component ID in candidate"));
goto on_return;
}
cand->comp_id = (pj_uint8_t) atoi(token);
/* Transport */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE transport in candidate"));
goto on_return;
}
if (pj_ansi_stricmp(token, "UDP") != 0) {
TRACE__((obj_name,
"Expecting ICE UDP transport only in candidate"));
goto on_return;
}
/* Priority */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE priority in candidate"));
goto on_return;
}
cand->prio = atoi(token);
/* Host */
host = strtok(NULL, " ");
if (!host) {
TRACE__((obj_name, "Expecting ICE host in candidate"));
goto on_return;
}
/* Detect address family */
if (pj_ansi_strchr(host, ':'))
af = pj_AF_INET6();
else
af = pj_AF_INET();
/* Assign address */
if (pj_sockaddr_init(af, &cand->addr, pj_cstr(&s, host), 0)) {
TRACE__((obj_name, "Invalid ICE candidate address"));
goto on_return;
}
/* Port */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE port number in candidate"));
goto on_return;
}
pj_sockaddr_set_port(&cand->addr, (pj_uint16_t)atoi(token));
/* typ */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE \"typ\" in candidate"));
goto on_return;
}
if (pj_ansi_stricmp(token, "typ") != 0) {
TRACE__((obj_name, "Expecting ICE \"typ\" in candidate"));
goto on_return;
}
/* candidate type */
token = strtok(NULL, " ");
if (!token) {
TRACE__((obj_name, "Expecting ICE candidate type in candidate"));
goto on_return;
}
if (pj_ansi_stricmp(token, "host") == 0) {
cand->type = PJ_ICE_CAND_TYPE_HOST;
} else if (pj_ansi_stricmp(token, "srflx") == 0) {
cand->type = PJ_ICE_CAND_TYPE_SRFLX;
} else if (pj_ansi_stricmp(token, "relay") == 0) {
cand->type = PJ_ICE_CAND_TYPE_RELAYED;
} else if (pj_ansi_stricmp(token, "prflx") == 0) {
cand->type = PJ_ICE_CAND_TYPE_PRFLX;
} else {
PJ_LOG(5,(obj_name, "Invalid ICE candidate type %s in candidate",
token));
goto on_return;
}
status = PJ_SUCCESS;
on_return:
return status;
}
/* Create initial SDP offer */
static pj_status_t create_initial_offer(struct transport_ice *tp_ice,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *loc_sdp,
unsigned media_index)
{
pj_status_t status;
/* Encode ICE in SDP */
status = encode_session_in_sdp(tp_ice, sdp_pool, loc_sdp, media_index,
tp_ice->comp_cnt, PJ_FALSE);
if (status != PJ_SUCCESS) {
set_no_ice(tp_ice, "Error encoding SDP answer", status);
return status;
}
return PJ_SUCCESS;
}
/* Verify incoming offer */
static pj_status_t verify_ice_sdp(struct transport_ice *tp_ice,
pj_pool_t *tmp_pool,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index,
pj_ice_sess_role current_ice_role,
struct sdp_state *sdp_state)
{
const pjmedia_sdp_media *rem_m;
const pjmedia_sdp_attr *ufrag_attr, *pwd_attr;
const pjmedia_sdp_conn *rem_conn;
pj_bool_t comp1_found=PJ_FALSE, comp2_found=PJ_FALSE, has_rtcp=PJ_FALSE;
pj_sockaddr rem_conn_addr, rtcp_addr;
unsigned i;
pj_status_t status;
rem_m = rem_sdp->media[media_index];
/* Get the "ice-ufrag" and "ice-pwd" attributes */
get_ice_attr(rem_sdp, rem_m, &ufrag_attr, &pwd_attr);
/* If "ice-ufrag" or "ice-pwd" are not found, disable ICE */
if (ufrag_attr==NULL || pwd_attr==NULL) {
sdp_state->match_comp_cnt = 0;
return PJ_SUCCESS;
}
/* Verify that default target for each component matches one of the
* candidate for the component. Otherwise stop ICE with ICE ice_mismatch
* error.
*/
/* Component 1 is the c= line */
rem_conn = rem_m->conn;
if (rem_conn == NULL)
rem_conn = rem_sdp->conn;
if (!rem_conn)
return PJMEDIA_SDP_EMISSINGCONN;
/* Verify address family matches */
if ((tp_ice->af==pj_AF_INET() &&
pj_strcmp(&rem_conn->addr_type, &STR_IP4)!=0) ||
(tp_ice->af==pj_AF_INET6() &&
pj_strcmp(&rem_conn->addr_type, &STR_IP6)!=0))
{
return PJMEDIA_SDP_ETPORTNOTEQUAL;
}
/* Assign remote connection address */
status = pj_sockaddr_init(tp_ice->af, &rem_conn_addr, &rem_conn->addr,
(pj_uint16_t)rem_m->desc.port);
if (status != PJ_SUCCESS)
return status;
if (tp_ice->comp_cnt > 1) {
const pjmedia_sdp_attr *attr;
/* Get default RTCP candidate from a=rtcp line, if present, otherwise
* calculate default RTCP candidate from default RTP target.
*/
attr = pjmedia_sdp_attr_find(rem_m->attr_count, rem_m->attr,
&STR_RTCP, NULL);
has_rtcp = (attr != NULL);
if (attr) {
pjmedia_sdp_rtcp_attr rtcp_attr;
status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp_attr);
if (status != PJ_SUCCESS) {
/* Error parsing a=rtcp attribute */
return status;
}
if (rtcp_attr.addr.slen) {
/* Verify address family matches */
if ((tp_ice->af==pj_AF_INET() &&
pj_strcmp(&rtcp_attr.addr_type, &STR_IP4)!=0) ||
(tp_ice->af==pj_AF_INET6() &&
pj_strcmp(&rtcp_attr.addr_type, &STR_IP6)!=0))
{
return PJMEDIA_SDP_ETPORTNOTEQUAL;
}
/* Assign RTCP address */
status = pj_sockaddr_init(tp_ice->af, &rtcp_addr,
&rtcp_attr.addr,
(pj_uint16_t)rtcp_attr.port);
if (status != PJ_SUCCESS) {
return PJMEDIA_SDP_EINRTCP;
}
} else {
/* Assign RTCP address */
status = pj_sockaddr_init(tp_ice->af, &rtcp_addr,
NULL,
(pj_uint16_t)rtcp_attr.port);
if (status != PJ_SUCCESS) {
return PJMEDIA_SDP_EINRTCP;
}
pj_sockaddr_copy_addr(&rtcp_addr, &rem_conn_addr);
}
} else {
unsigned rtcp_port;
rtcp_port = pj_sockaddr_get_port(&rem_conn_addr) + 1;
pj_sockaddr_cp(&rtcp_addr, &rem_conn_addr);
pj_sockaddr_set_port(&rtcp_addr, (pj_uint16_t)rtcp_port);
}
}
/* Find the default addresses in a=candidate attributes.
*/
for (i=0; i<rem_m->attr_count; ++i) {
pj_ice_sess_cand cand;
if (pj_strcmp(&rem_m->attr[i]->name, &STR_CANDIDATE)!=0)
continue;
status = parse_cand(tp_ice->base.name, tmp_pool,
&rem_m->attr[i]->value, &cand);
if (status != PJ_SUCCESS) {
PJ_LOG(4,(tp_ice->base.name,
"Error in parsing SDP candidate attribute '%.*s', "
"candidate is ignored",
(int)rem_m->attr[i]->value.slen,
rem_m->attr[i]->value.ptr));
continue;
}
if (!comp1_found && cand.comp_id==COMP_RTP &&
pj_sockaddr_cmp(&rem_conn_addr, &cand.addr)==0)
{
comp1_found = PJ_TRUE;
} else if (!comp2_found && cand.comp_id==COMP_RTCP &&
pj_sockaddr_cmp(&rtcp_addr, &cand.addr)==0)
{
comp2_found = PJ_TRUE;
}
if (cand.comp_id == COMP_RTCP)
has_rtcp = PJ_TRUE;
if (comp1_found && (comp2_found || tp_ice->comp_cnt==1))
break;
}
/* Check matched component count and ice_mismatch */
if (comp1_found && (tp_ice->comp_cnt==1 || !has_rtcp)) {
sdp_state->match_comp_cnt = 1;
sdp_state->ice_mismatch = PJ_FALSE;
} else if (comp1_found && comp2_found) {
sdp_state->match_comp_cnt = 2;
sdp_state->ice_mismatch = PJ_FALSE;
} else {
sdp_state->match_comp_cnt = (tp_ice->comp_cnt > 1 && has_rtcp)? 2 : 1;
sdp_state->ice_mismatch = PJ_TRUE;
}
/* Detect remote restarting session */
if (pj_ice_strans_has_sess(tp_ice->ice_st) &&
(pj_ice_strans_sess_is_running(tp_ice->ice_st) ||
pj_ice_strans_sess_is_complete(tp_ice->ice_st)))
{
pj_str_t rem_run_ufrag, rem_run_pwd;
pj_ice_strans_get_ufrag_pwd(tp_ice->ice_st, NULL, NULL,
&rem_run_ufrag, &rem_run_pwd);
if (pj_strcmp(&ufrag_attr->value, &rem_run_ufrag) ||
pj_strcmp(&pwd_attr->value, &rem_run_pwd))
{
/* Remote offers to restart ICE */
sdp_state->ice_restart = PJ_TRUE;
} else {
sdp_state->ice_restart = PJ_FALSE;
}
} else {
sdp_state->ice_restart = PJ_FALSE;
}
/* Detect our role */
if (current_ice_role==PJ_ICE_SESS_ROLE_CONTROLLING) {
sdp_state->local_role = PJ_ICE_SESS_ROLE_CONTROLLING;
} else {
if (pjmedia_sdp_attr_find(rem_sdp->attr_count, rem_sdp->attr,
&STR_ICE_LITE, NULL) != NULL)
{
/* Remote is ICE Lite */
sdp_state->local_role = PJ_ICE_SESS_ROLE_CONTROLLING;
} else {
sdp_state->local_role = PJ_ICE_SESS_ROLE_CONTROLLED;
}
}
PJ_LOG(4,(tp_ice->base.name,
"Processing SDP: support ICE=%u, common comp_cnt=%u, "
"ice_mismatch=%u, ice_restart=%u, local_role=%s",
(sdp_state->match_comp_cnt != 0),
sdp_state->match_comp_cnt,
sdp_state->ice_mismatch,
sdp_state->ice_restart,
pj_ice_sess_role_name(sdp_state->local_role)));
return PJ_SUCCESS;
}
/* Verify incoming offer and create initial answer */
static pj_status_t create_initial_answer(struct transport_ice *tp_ice,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *loc_sdp,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
const pjmedia_sdp_media *rem_m = rem_sdp->media[media_index];
pj_status_t status;
/* Check if media is removed (just in case) */
if (rem_m->desc.port == 0) {
return PJ_SUCCESS;
}
/* Verify the offer */
status = verify_ice_sdp(tp_ice, sdp_pool, rem_sdp, media_index,
PJ_ICE_SESS_ROLE_CONTROLLED,
&tp_ice->rem_offer_state);
if (status != PJ_SUCCESS) {
set_no_ice(tp_ice, "Invalid SDP offer", status);
return status;
}
/* Does remote support ICE? */
if (tp_ice->rem_offer_state.match_comp_cnt==0) {
set_no_ice(tp_ice, "No ICE found in SDP offer", PJ_SUCCESS);
return PJ_SUCCESS;
}
/* ICE ice_mismatch? */
if (tp_ice->rem_offer_state.ice_mismatch) {
set_no_ice(tp_ice, "ICE ice_mismatch in remote offer", PJ_SUCCESS);
encode_ice_mismatch(sdp_pool, loc_sdp, media_index);
return PJ_SUCCESS;
}
/* Encode ICE in SDP */
status = encode_session_in_sdp(tp_ice, sdp_pool, loc_sdp, media_index,
tp_ice->rem_offer_state.match_comp_cnt,
PJ_FALSE);
if (status != PJ_SUCCESS) {
set_no_ice(tp_ice, "Error encoding SDP answer", status);
return status;
}
return PJ_SUCCESS;
}
/* Create subsequent SDP offer */
static pj_status_t create_subsequent_offer(struct transport_ice *tp_ice,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *loc_sdp,
unsigned media_index)
{
unsigned comp_cnt;
if (pj_ice_strans_has_sess(tp_ice->ice_st) == PJ_FALSE) {
/* We don't have ICE */
return PJ_SUCCESS;
}
comp_cnt = pj_ice_strans_get_running_comp_cnt(tp_ice->ice_st);
return encode_session_in_sdp(tp_ice, sdp_pool, loc_sdp, media_index,
comp_cnt, PJ_FALSE);
}
/* Create subsequent SDP answer */
static pj_status_t create_subsequent_answer(struct transport_ice *tp_ice,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *loc_sdp,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
pj_status_t status;
/* We have a session */
status = verify_ice_sdp(tp_ice, sdp_pool, rem_sdp, media_index,
PJ_ICE_SESS_ROLE_CONTROLLED,
&tp_ice->rem_offer_state);
if (status != PJ_SUCCESS) {
/* Something wrong with the offer */
return status;
}
if (pj_ice_strans_has_sess(tp_ice->ice_st)) {
/*
* Received subsequent offer while we have ICE active.
*/
if (tp_ice->rem_offer_state.match_comp_cnt == 0) {
/* Remote no longer offers ICE */
return PJ_SUCCESS;
}
if (tp_ice->rem_offer_state.ice_mismatch) {
encode_ice_mismatch(sdp_pool, loc_sdp, media_index);
return PJ_SUCCESS;
}
status = encode_session_in_sdp(tp_ice, sdp_pool, loc_sdp, media_index,
tp_ice->rem_offer_state.match_comp_cnt,
tp_ice->rem_offer_state.ice_restart);
if (status != PJ_SUCCESS)
return status;
/* Done */
} else {
/*
* Received subsequent offer while we DON'T have ICE active.
*/
if (tp_ice->rem_offer_state.match_comp_cnt == 0) {
/* Remote does not support ICE */
return PJ_SUCCESS;
}
if (tp_ice->rem_offer_state.ice_mismatch) {
encode_ice_mismatch(sdp_pool, loc_sdp, media_index);
return PJ_SUCCESS;
}
/* Looks like now remote is offering ICE, so we need to create
* ICE session now.
*/
status = pj_ice_strans_init_ice(tp_ice->ice_st,
PJ_ICE_SESS_ROLE_CONTROLLED,
NULL, NULL);
if (status != PJ_SUCCESS) {
/* Fail to create new ICE session */
return status;
}
status = encode_session_in_sdp(tp_ice, sdp_pool, loc_sdp, media_index,
tp_ice->rem_offer_state.match_comp_cnt,
tp_ice->rem_offer_state.ice_restart);
if (status != PJ_SUCCESS)
return status;
/* Done */
}
return PJ_SUCCESS;
}
/*
* For both UAC and UAS, pass in the SDP before sending it to remote.
* This will add ICE attributes to the SDP.
*/
static pj_status_t transport_media_create(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
unsigned options,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
pj_ice_sess_role ice_role;
pj_status_t status;
PJ_UNUSED_ARG(media_index);
PJ_UNUSED_ARG(sdp_pool);
tp_ice->media_option = options;
tp_ice->oa_role = ROLE_NONE;
tp_ice->initial_sdp = PJ_TRUE;
/* Init ICE, the initial role is set now based on availability of
* rem_sdp, but it will be checked again later.
*/
ice_role = (rem_sdp==NULL ? PJ_ICE_SESS_ROLE_CONTROLLING :
PJ_ICE_SESS_ROLE_CONTROLLED);
status = pj_ice_strans_init_ice(tp_ice->ice_st, ice_role, NULL, NULL);
/* Done */
return status;
}
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
pj_status_t status;
/* Validate media transport */
/* This transport only support RTP/AVP transport, unless if
* transport checking is disabled
*/
if ((tp_ice->media_option & PJMEDIA_TPMED_NO_TRANSPORT_CHECKING) == 0) {
pjmedia_sdp_media *loc_m, *rem_m;
rem_m = rem_sdp? rem_sdp->media[media_index] : NULL;
loc_m = sdp_local->media[media_index];
if (pj_stricmp(&loc_m->desc.transport, &STR_RTP_AVP) ||
(rem_m && pj_stricmp(&rem_m->desc.transport, &STR_RTP_AVP)))
{
pjmedia_sdp_media_deactivate(sdp_pool, loc_m);
return PJMEDIA_SDP_EINPROTO;
}
}
if (tp_ice->initial_sdp) {
if (rem_sdp) {
status = create_initial_answer(tp_ice, sdp_pool, sdp_local,
rem_sdp, media_index);
} else {
status = create_initial_offer(tp_ice, sdp_pool, sdp_local,
media_index);
}
} else {
if (rem_sdp) {
status = create_subsequent_answer(tp_ice, sdp_pool, sdp_local,
rem_sdp, media_index);
} else {
status = create_subsequent_offer(tp_ice, sdp_pool, sdp_local,
media_index);
}
}
if (status==PJ_SUCCESS) {
if (rem_sdp)
tp_ice->oa_role = ROLE_ANSWERER;
else
tp_ice->oa_role = ROLE_OFFERER;
}
return status;
}
/* Start ICE session with the specified remote SDP */
static pj_status_t start_ice(struct transport_ice *tp_ice,
pj_pool_t *tmp_pool,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
pjmedia_sdp_media *rem_m = rem_sdp->media[media_index];
const pjmedia_sdp_attr *ufrag_attr, *pwd_attr;
pj_ice_sess_cand *cand;
unsigned i, cand_cnt;
pj_status_t status;
get_ice_attr(rem_sdp, rem_m, &ufrag_attr, &pwd_attr);
/* Allocate candidate array */
cand = (pj_ice_sess_cand*)
pj_pool_calloc(tmp_pool, PJ_ICE_MAX_CAND,
sizeof(pj_ice_sess_cand));
/* Get all candidates in the media */
cand_cnt = 0;
for (i=0; i<rem_m->attr_count && cand_cnt < PJ_ICE_MAX_CAND; ++i) {
pjmedia_sdp_attr *attr;
attr = rem_m->attr[i];
if (pj_strcmp(&attr->name, &STR_CANDIDATE)!=0)
continue;
/* Parse candidate */
status = parse_cand(tp_ice->base.name, tmp_pool, &attr->value,
&cand[cand_cnt]);
if (status != PJ_SUCCESS) {
PJ_LOG(4,(tp_ice->base.name,
"Error in parsing SDP candidate attribute '%.*s', "
"candidate is ignored",
(int)attr->value.slen, attr->value.ptr));
continue;
}
cand_cnt++;
}
/* Start ICE */
return pj_ice_strans_start_ice(tp_ice->ice_st, &ufrag_attr->value,
&pwd_attr->value, cand_cnt, cand);
}
/*
* Start ICE checks when both offer and answer have been negotiated
* by SDP negotiator.
*/
static pj_status_t transport_media_start(pjmedia_transport *tp,
pj_pool_t *tmp_pool,
const pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *rem_sdp,
unsigned media_index)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
pjmedia_sdp_media *rem_m;
enum oa_role current_oa_role;
pj_bool_t initial_oa;
pj_status_t status;
PJ_ASSERT_RETURN(tp && tmp_pool && rem_sdp, PJ_EINVAL);
PJ_ASSERT_RETURN(media_index < rem_sdp->media_count, PJ_EINVAL);
rem_m = rem_sdp->media[media_index];
initial_oa = tp_ice->initial_sdp;
current_oa_role = tp_ice->oa_role;
/* SDP has been negotiated */
tp_ice->initial_sdp = PJ_FALSE;
tp_ice->oa_role = ROLE_NONE;
/* Nothing to do if we don't have ICE session */
if (pj_ice_strans_has_sess(tp_ice->ice_st) == PJ_FALSE) {
return PJ_SUCCESS;
}
/* Special case for Session Timer. The re-INVITE for session refresh
* doesn't call transport_encode_sdp(), causing current_oa_role to
* be set to ROLE_NONE. This is a workaround.
*/
if (current_oa_role == ROLE_NONE) {
current_oa_role = ROLE_OFFERER;
}
/* Processing depends on the offer/answer role */
if (current_oa_role == ROLE_OFFERER) {
/*
* We are offerer. So this will be the first time we see the
* remote's SDP.
*/
struct sdp_state answer_state;
/* Verify the answer */
status = verify_ice_sdp(tp_ice, tmp_pool, rem_sdp, media_index,
PJ_ICE_SESS_ROLE_CONTROLLING, &answer_state);
if (status != PJ_SUCCESS) {
/* Something wrong in the SDP answer */
set_no_ice(tp_ice, "Invalid remote SDP answer", status);
return status;
}
/* Does it have ICE? */
if (answer_state.match_comp_cnt == 0) {
/* Remote doesn't support ICE */
set_no_ice(tp_ice, "Remote answer doesn't support ICE",
PJ_SUCCESS);
return PJ_SUCCESS;
}
/* Check if remote has reported ice-mismatch */
if (pjmedia_sdp_attr_find(rem_m->attr_count, rem_m->attr,
&STR_ICE_MISMATCH, NULL) != NULL)
{
/* Remote has reported ice-mismatch */
set_no_ice(tp_ice,
"Remote answer contains 'ice-mismatch' attribute",
PJ_SUCCESS);
return PJ_SUCCESS;
}
/* Check if remote has indicated a restart */
if (answer_state.ice_restart) {
PJ_LOG(2,(tp_ice->base.name,
"Warning: remote has signalled ICE restart in SDP "
"answer which is disallowed. Remote ICE negotiation"
" may fail."));
}
/* Check if the answer itself is mismatched */
if (answer_state.ice_mismatch) {
/* This happens either when a B2BUA modified remote answer but
* strangely didn't modify our offer, or remote is not capable
* of detecting mismatch in our offer (it didn't put
* 'ice-mismatch' attribute in the answer).
*/
PJ_LOG(2,(tp_ice->base.name,
"Warning: remote answer mismatch, but it does not "
"reject our offer with 'ice-mismatch'. ICE negotiation "
"may fail"));
}
/* Do nothing if ICE is complete or running */
if (pj_ice_strans_sess_is_running(tp_ice->ice_st)) {
PJ_LOG(4,(tp_ice->base.name,
"Ignored offer/answer because ICE is running"));
return PJ_SUCCESS;
}
if (pj_ice_strans_sess_is_complete(tp_ice->ice_st)) {
PJ_LOG(4,(tp_ice->base.name, "ICE session unchanged"));
return PJ_SUCCESS;
}
/* Start ICE */
} else {
/*
* We are answerer. We've seen and negotiated remote's SDP
* before, and the result is in "rem_offer_state".
*/
const pjmedia_sdp_attr *ufrag_attr, *pwd_attr;
/* Check for ICE in remote offer */
if (tp_ice->rem_offer_state.match_comp_cnt == 0) {
/* No ICE attribute present */
set_no_ice(tp_ice, "Remote no longer offers ICE",
PJ_SUCCESS);
return PJ_SUCCESS;
}
/* Check for ICE ice_mismatch condition in the offer */
if (tp_ice->rem_offer_state.ice_mismatch) {
set_no_ice(tp_ice, "Remote offer mismatch: ",
PJNATH_EICEMISMATCH);
return PJ_SUCCESS;
}
/* If ICE is complete and remote doesn't request restart,
* then leave the session as is.
*/
if (!initial_oa && tp_ice->rem_offer_state.ice_restart == PJ_FALSE) {
/* Remote has not requested ICE restart, so session is
* unchanged.
*/
PJ_LOG(4,(tp_ice->base.name, "ICE session unchanged"));
return PJ_SUCCESS;
}
/* Either remote has requested ICE restart or this is our
* first answer.
*/
/* Stop ICE */
if (!initial_oa) {
set_no_ice(tp_ice, "restarting by remote request..", PJ_SUCCESS);
/* We have put new ICE ufrag and pwd in the answer. Now
* create a new ICE session with that ufrag/pwd pair.
*/
get_ice_attr(sdp_local, sdp_local->media[media_index],
&ufrag_attr, &pwd_attr);
status = pj_ice_strans_init_ice(tp_ice->ice_st,
tp_ice->rem_offer_state.local_role,
&ufrag_attr->value,
&pwd_attr->value);
if (status != PJ_SUCCESS) {
PJ_LOG(1,(tp_ice->base.name,
"ICE re-initialization failed (status=%d)!",
status));
return status;
}
}
/* Ticket #977: Update role if turns out we're supposed to be the
* Controlling agent (e.g. when talking to ice-lite peer).
*/
if (tp_ice->rem_offer_state.local_role==PJ_ICE_SESS_ROLE_CONTROLLING &&
pj_ice_strans_has_sess(tp_ice->ice_st))
{
pj_ice_strans_change_role(tp_ice->ice_st,
PJ_ICE_SESS_ROLE_CONTROLLING);
}
/* start ICE */
}
/* Now start ICE */
status = start_ice(tp_ice, tmp_pool, rem_sdp, media_index);
if (status != PJ_SUCCESS) {
PJ_LOG(1,(tp_ice->base.name,
"ICE restart failed (status=%d)!",
status));
return status;
}
/* Done */
tp_ice->use_ice = PJ_TRUE;
return PJ_SUCCESS;
}
static pj_status_t transport_media_stop(pjmedia_transport *tp)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
set_no_ice(tp_ice, "media stop requested", PJ_SUCCESS);
return PJ_SUCCESS;
}
static pj_status_t transport_get_info(pjmedia_transport *tp,
pjmedia_transport_info *info)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
pj_ice_sess_cand cand;
pj_status_t status;
pj_bzero(&info->sock_info, sizeof(info->sock_info));
info->sock_info.rtp_sock = info->sock_info.rtcp_sock = PJ_INVALID_SOCKET;
/* Get RTP default address */
status = pj_ice_strans_get_def_cand(tp_ice->ice_st, 1, &cand);
if (status != PJ_SUCCESS)
return status;
pj_sockaddr_cp(&info->sock_info.rtp_addr_name, &cand.addr);
/* Get RTCP default address */
if (tp_ice->comp_cnt > 1) {
status = pj_ice_strans_get_def_cand(tp_ice->ice_st, 2, &cand);
if (status != PJ_SUCCESS)
return status;
pj_sockaddr_cp(&info->sock_info.rtcp_addr_name, &cand.addr);
}
/* Set remote address originating RTP & RTCP if this transport has
* ICE activated or received any packets.
*/
if (tp_ice->use_ice || tp_ice->rtp_src_cnt) {
info->src_rtp_name = tp_ice->rtp_src_addr;
}
if (tp_ice->use_ice || tp_ice->rtcp_src_cnt) {
info->src_rtcp_name = tp_ice->rtcp_src_addr;
}
/* Fill up transport specific info */
if (info->specific_info_cnt < PJ_ARRAY_SIZE(info->spc_info)) {
pjmedia_transport_specific_info *tsi;
pjmedia_ice_transport_info *ii;
unsigned i;
pj_assert(sizeof(*ii) <= sizeof(tsi->buffer));
tsi = &info->spc_info[info->specific_info_cnt++];
tsi->type = PJMEDIA_TRANSPORT_TYPE_ICE;
tsi->cbsize = sizeof(*ii);
ii = (pjmedia_ice_transport_info*) tsi->buffer;
pj_bzero(ii, sizeof(*ii));
ii->active = tp_ice->use_ice;
if (pj_ice_strans_has_sess(tp_ice->ice_st))
ii->role = pj_ice_strans_get_role(tp_ice->ice_st);
else
ii->role = PJ_ICE_SESS_ROLE_UNKNOWN;
ii->sess_state = pj_ice_strans_get_state(tp_ice->ice_st);
ii->comp_cnt = pj_ice_strans_get_running_comp_cnt(tp_ice->ice_st);
for (i=1; i<=ii->comp_cnt && i<=PJ_ARRAY_SIZE(ii->comp); ++i) {
const pj_ice_sess_check *chk;
chk = pj_ice_strans_get_valid_pair(tp_ice->ice_st, i);
if (chk) {
ii->comp[i-1].lcand_type = chk->lcand->type;
pj_sockaddr_cp(&ii->comp[i-1].lcand_addr,
&chk->lcand->addr);
ii->comp[i-1].rcand_type = chk->rcand->type;
pj_sockaddr_cp(&ii->comp[i-1].rcand_addr,
&chk->rcand->addr);
}
}
}
return PJ_SUCCESS;
}
static pj_status_t transport_attach (pjmedia_transport *tp,
void *stream,
const pj_sockaddr_t *rem_addr,
const pj_sockaddr_t *rem_rtcp,
unsigned addr_len,
void (*rtp_cb)(void*,
void*,
pj_ssize_t),
void (*rtcp_cb)(void*,
void*,
pj_ssize_t))
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
tp_ice->stream = stream;
tp_ice->rtp_cb = rtp_cb;
tp_ice->rtcp_cb = rtcp_cb;
pj_memcpy(&tp_ice->remote_rtp, rem_addr, addr_len);
pj_memcpy(&tp_ice->remote_rtcp, rem_rtcp, addr_len);
tp_ice->addr_len = addr_len;
/* Init source RTP & RTCP addresses and counter */
tp_ice->rtp_src_addr = tp_ice->remote_rtp;
tp_ice->rtcp_src_addr = tp_ice->remote_rtcp;
tp_ice->rtp_src_cnt = 0;
tp_ice->rtcp_src_cnt = 0;
return PJ_SUCCESS;
}
static void transport_detach(pjmedia_transport *tp,
void *strm)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
/* TODO: need to solve ticket #460 here */
tp_ice->rtp_cb = NULL;
tp_ice->rtcp_cb = NULL;
tp_ice->stream = NULL;
PJ_UNUSED_ARG(strm);
}
static pj_status_t transport_send_rtp(pjmedia_transport *tp,
const void *pkt,
pj_size_t size)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
/* Simulate packet lost on TX direction */
if (tp_ice->tx_drop_pct) {
if ((pj_rand() % 100) <= (int)tp_ice->tx_drop_pct) {
PJ_LOG(5,(tp_ice->base.name,
"TX RTP packet dropped because of pkt lost "
"simulation"));
return PJ_SUCCESS;
}
}
return pj_ice_strans_sendto(tp_ice->ice_st, 1,
pkt, size, &tp_ice->remote_rtp,
tp_ice->addr_len);
}
static pj_status_t transport_send_rtcp(pjmedia_transport *tp,
const void *pkt,
pj_size_t size)
{
return transport_send_rtcp2(tp, NULL, 0, pkt, size);
}
static pj_status_t transport_send_rtcp2(pjmedia_transport *tp,
const pj_sockaddr_t *addr,
unsigned addr_len,
const void *pkt,
pj_size_t size)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
if (tp_ice->comp_cnt > 1) {
if (addr == NULL) {
addr = &tp_ice->remote_rtcp;
addr_len = pj_sockaddr_get_len(addr);
}
return pj_ice_strans_sendto(tp_ice->ice_st, 2, pkt, size,
addr, addr_len);
} else {
return PJ_SUCCESS;
}
}
static void ice_on_rx_data(pj_ice_strans *ice_st, unsigned comp_id,
void *pkt, pj_size_t size,
const pj_sockaddr_t *src_addr,
unsigned src_addr_len)
{
struct transport_ice *tp_ice;
pj_bool_t discard = PJ_FALSE;
tp_ice = (struct transport_ice*) pj_ice_strans_get_user_data(ice_st);
if (comp_id==1 && tp_ice->rtp_cb) {
/* Simulate packet lost on RX direction */
if (tp_ice->rx_drop_pct) {
if ((pj_rand() % 100) <= (int)tp_ice->rx_drop_pct) {
PJ_LOG(5,(tp_ice->base.name,
"RX RTP packet dropped because of pkt lost "
"simulation"));
return;
}
}
/* See if source address of RTP packet is different than the
* configured address, and switch RTP remote address to
* source packet address after several consecutive packets
* have been received.
*/
if (!tp_ice->use_ice) {
pj_bool_t enable_switch =
((tp_ice->options & PJMEDIA_ICE_NO_SRC_ADDR_CHECKING)==0);
if (!enable_switch ||
pj_sockaddr_cmp(&tp_ice->remote_rtp, src_addr) == 0)
{
/* Don't switch while we're receiving from remote_rtp */
tp_ice->rtp_src_cnt = 0;
} else {
++tp_ice->rtp_src_cnt;
/* Check if the source address is recognized. */
if (pj_sockaddr_cmp(src_addr, &tp_ice->rtp_src_addr) != 0) {
/* Remember the new source address. */
pj_sockaddr_cp(&tp_ice->rtp_src_addr, src_addr);
/* Reset counter */
tp_ice->rtp_src_cnt = 0;
discard = PJ_TRUE;
}
if (tp_ice->rtp_src_cnt < PJMEDIA_RTP_NAT_PROBATION_CNT) {
discard = PJ_TRUE;
} else {
char addr_text[80];
/* Set remote RTP address to source address */
pj_sockaddr_cp(&tp_ice->remote_rtp, &tp_ice->rtp_src_addr);
tp_ice->addr_len = pj_sockaddr_get_len(&tp_ice->remote_rtp);
/* Reset counter */
tp_ice->rtp_src_cnt = 0;
PJ_LOG(4,(tp_ice->base.name,
"Remote RTP address switched to %s",
pj_sockaddr_print(&tp_ice->remote_rtp, addr_text,
sizeof(addr_text), 3)));
/* Also update remote RTCP address if actual RTCP source
* address is not heard yet.
*/
if (!pj_sockaddr_has_addr(&tp_ice->rtcp_src_addr)) {
pj_uint16_t port;
pj_sockaddr_cp(&tp_ice->remote_rtcp,
&tp_ice->remote_rtp);
port = (pj_uint16_t)
(pj_sockaddr_get_port(&tp_ice->remote_rtp)+1);
pj_sockaddr_set_port(&tp_ice->remote_rtcp, port);
PJ_LOG(4,(tp_ice->base.name,
"Remote RTCP address switched to predicted "
"address %s",
pj_sockaddr_print(&tp_ice->remote_rtcp,
addr_text,
sizeof(addr_text), 3)));
}
}
}
}
if (!discard)
(*tp_ice->rtp_cb)(tp_ice->stream, pkt, size);
} else if (comp_id==2 && tp_ice->rtcp_cb) {
/* Check if RTCP source address is the same as the configured
* remote address, and switch the address when they are
* different.
*/
if (!tp_ice->use_ice &&
(tp_ice->options & PJMEDIA_ICE_NO_SRC_ADDR_CHECKING)==0)
{
if (pj_sockaddr_cmp(&tp_ice->remote_rtcp, src_addr) == 0) {
tp_ice->rtcp_src_cnt = 0;
} else {
char addr_text[80];
++tp_ice->rtcp_src_cnt;
if (tp_ice->rtcp_src_cnt < PJMEDIA_RTCP_NAT_PROBATION_CNT) {
discard = PJ_TRUE;
} else {
tp_ice->rtcp_src_cnt = 0;
pj_sockaddr_cp(&tp_ice->rtcp_src_addr, src_addr);
pj_sockaddr_cp(&tp_ice->remote_rtcp, src_addr);
pj_assert(tp_ice->addr_len==pj_sockaddr_get_len(src_addr));
PJ_LOG(4,(tp_ice->base.name,
"Remote RTCP address switched to %s",
pj_sockaddr_print(&tp_ice->remote_rtcp,
addr_text, sizeof(addr_text),
3)));
}
}
}
if (!discard)
(*tp_ice->rtcp_cb)(tp_ice->stream, pkt, size);
}
PJ_UNUSED_ARG(src_addr_len);
}
static void ice_on_ice_complete(pj_ice_strans *ice_st,
pj_ice_strans_op op,
pj_status_t result)
{
struct transport_ice *tp_ice;
tp_ice = (struct transport_ice*) pj_ice_strans_get_user_data(ice_st);
/* Notify application */
if (tp_ice->cb.on_ice_complete)
(*tp_ice->cb.on_ice_complete)(&tp_ice->base, op, result);
}
/* Simulate lost */
static pj_status_t transport_simulate_lost(pjmedia_transport *tp,
pjmedia_dir dir,
unsigned pct_lost)
{
struct transport_ice *ice = (struct transport_ice*) tp;
PJ_ASSERT_RETURN(tp && pct_lost <= 100, PJ_EINVAL);
if (dir & PJMEDIA_DIR_ENCODING)
ice->tx_drop_pct = pct_lost;
if (dir & PJMEDIA_DIR_DECODING)
ice->rx_drop_pct = pct_lost;
return PJ_SUCCESS;
}
/*
* Destroy ICE media transport.
*/
static pj_status_t transport_destroy(pjmedia_transport *tp)
{
struct transport_ice *tp_ice = (struct transport_ice*)tp;
if (tp_ice->ice_st) {
pj_ice_strans_destroy(tp_ice->ice_st);
tp_ice->ice_st = NULL;
}
if (tp_ice->pool) {
pj_pool_t *pool = tp_ice->pool;
tp_ice->pool = NULL;
pj_pool_release(pool);
}
return PJ_SUCCESS;
}