/* Start ICE negotiation on the endpoint, based on parameter from
* the other endpoint.
*/
static pj_status_t start_ice(struct ice_ept *ept, const struct ice_ept *remote)
{
pj_ice_sess_cand rcand[32];
unsigned i, rcand_cnt = 0;
pj_status_t status;
/* Enum remote candidates */
for (i=0; i<remote->cfg.comp_cnt; ++i) {
unsigned cnt = PJ_ARRAY_SIZE(rcand) - rcand_cnt;
status = pj_ice_strans_enum_cands(remote->ice, i+1, &cnt, rcand+rcand_cnt);
if (status != PJ_SUCCESS) {
app_perror(INDENT "err: pj_ice_strans_enum_cands()", status);
return status;
}
rcand_cnt += cnt;
}
status = pj_ice_strans_start_ice(ept->ice, &remote->ufrag, &remote->pass,
rcand_cnt, rcand);
if (status != PJ_SUCCESS) {
app_perror(INDENT "err: pj_ice_strans_start_ice()", status);
return status;
}
return PJ_SUCCESS;
}
static int extract_sdp_to_xml(struct ice_trans_s* icetrans,char buffer[], unsigned maxlen, ice_option_t opt, char *usrid)
{
char *p = buffer;
unsigned comp;
int printed;
pj_str_t local_ufrag, local_pwd;
pj_status_t status;
//Me: add
PRINT(" <registerPeer>");
PRINT("<device> <uniqueId>%s</uniqueId> </device>", usrid);
/* Write "dummy" SDP v=, o=, s=, and t= lines */
// Me: comment
//PRINT("v=0\no=- 3414953978 3414953978 IN IP4 localhost\ns=ice\nt=0 0\n");
/* Get ufrag and pwd from current session */
pj_ice_strans_get_ufrag_pwd(icetrans->icest, &local_ufrag, &local_pwd,
NULL, NULL);
/* Write the a=ice-ufrag and a=ice-pwd attributes */
// Me: comment
//PRINT("a=ice-ufrag:%.*s\na=ice-pwd:%.*s\n",
// (int)local_ufrag.slen,
// local_ufrag.ptr,
// (int)local_pwd.slen,
// local_pwd.ptr);
PRINT("<ufrag>%.*s</ufrag> <pwd>%.*s</pwd>",
(int)local_ufrag.slen,
local_ufrag.ptr,
(int)local_pwd.slen,
local_pwd.ptr);
PRINT(" <candidateList>");
/* Write each component */
for (comp=0; comp<opt.comp_cnt; ++comp) {
unsigned j, cand_cnt;
pj_ice_sess_cand cand[PJ_ICE_ST_MAX_CAND];
char ipaddr[PJ_INET6_ADDRSTRLEN];
/* Get default candidate for the component */
status = pj_ice_strans_get_def_cand(icetrans->icest, comp+1, &cand[0]);
if (status != PJ_SUCCESS)
return -status;
/* Write the default address */
if (comp==0) {
/* For component 1, default address is in m= and c= lines */
// Me: comment
// PRINT("m=audio %d RTP/AVP 0\n"
// "c=IN IP4 %s\n",
// (int)pj_sockaddr_get_port(&cand[0].addr),
// pj_sockaddr_print(&cand[0].addr, ipaddr,
// sizeof(ipaddr), 0));
PRINT("<comp_1> <port>%d</port>"
"<ip>%s</ip> </comp_1>",
(int)pj_sockaddr_get_port(&cand[0].addr),
pj_sockaddr_print(&cand[0].addr, ipaddr,
sizeof(ipaddr), 0));
} else if (comp==1) {
/* For component 2, default address is in a=rtcp line */
//Me: comment
//PRINT("a=rtcp:%d IN IP4 %s\n",
// (int)pj_sockaddr_get_port(&cand[0].addr),
// pj_sockaddr_print(&cand[0].addr, ipaddr,
// sizeof(ipaddr), 0));
} else {
/* For other components, we'll just invent this.. */
// Me: comment
//PRINT("a=Xice-defcand:%d IN IP4 %s\n",
// (int)pj_sockaddr_get_port(&cand[0].addr),
// pj_sockaddr_print(&cand[0].addr, ipaddr,
// sizeof(ipaddr), 0));
}
/* Enumerate all candidates for this component */
cand_cnt = PJ_ARRAY_SIZE(cand);
status = pj_ice_strans_enum_cands(icetrans->icest, comp+1,
&cand_cnt, cand);
if (status != PJ_SUCCESS)
return -status;
/* And encode the candidates as SDP */
//const int buffer_xml_len = 2048;
//char buffer_xml[buffer_xml_len];
for (j=0; j<cand_cnt; ++j) {
printed = print_cand_to_xml(p, maxlen - (unsigned)(p-buffer), &cand[j]);
if (printed < 0)
return -PJ_ETOOSMALL;
// printed = print_cand_to_xml(p, maxlen - (unsigned)(p-buffer), &cand[j]);
// if (printed < 0)
// return -PJ_ETOOSMALL;
p += printed;
}
}
PRINT("</candidateList>");
PRINT(" </registerPeer>");
if (p == buffer+maxlen)
return -PJ_ETOOSMALL;
*p = '\0';
//printf("DEBUGGGGGG: %s \n", (p - buffer);
return (int)(p - buffer);
}
int krx_ice_start_session(krx_ice* k) {
pj_status_t r;
if(!k) { return - 1; }
if(!k->ice_st) { return -2; }
if(pj_ice_strans_has_sess(k->ice_st)) {
printf("Error: ice already has a session.\n");
return -3;
}
r = pj_ice_strans_init_ice(k->ice_st, PJ_ICE_SESS_ROLE_CONTROLLED, NULL, NULL);
if(r != PJ_SUCCESS) {
printf("Error: cannot initialize an ice session.\n");
return -4;
}
/* this is where we can create an sdp */
char sdp_buf[8096] = { 0 } ;
sprintf(sdp_buf,
"v=0\n"
"o=- 123456789 34234324 IN IP4 localhost\n" /* - [identifier] [session version] IN IP4 localhost */
"s=krx_ice\n" /* software */
"t=0 0\n" /* start, ending time */
"a=ice-ufrag:%s\n"
"a=ice-pwd:%s\n"
,
k->ice_ufrag,
k->ice_pwd
);
/* write each component */
for(int i = 0; i < k->ncomp; ++i) {
pj_ice_sess_cand cand[PJ_ICE_ST_MAX_CAND] = { 0 } ;
char ipaddr[PJ_INET6_ADDRSTRLEN] = { 0 } ;
/* get default candidate for component, note that compoments start numbering from 1, not zero. */
r = pj_ice_strans_get_def_cand(k->ice_st, 1, &cand[0]);
if(r != PJ_SUCCESS) {
printf("Error: cannot retrieve default candidate for component: %d\n", i+1);
continue;
}
if(i == 0) {
int offset = strlen(sdp_buf);
sprintf(sdp_buf + offset,
"m=video %d RTP/SAVPF 120\n"
"c=IN IP4 %s\n"
,
(int)pj_sockaddr_get_port(&cand[0].addr),
pj_sockaddr_print(&cand[0].addr, ipaddr, sizeof(ipaddr), 0)
);
/* print all candidates */
unsigned num_cands = PJ_ARRAY_SIZE(cand);
printf("Found number of candidates: %d\n", num_cands);
// (ice_st && ice_st->ice && comp_id && comp_id <= ice_st->comp_cnt && count && cand),
printf("ice: %p\n", k->ice_st);
r = pj_ice_strans_enum_cands(k->ice_st, i + 1, &num_cands, cand);
if(r != PJ_SUCCESS) {
printf("Error: cannot retrieve candidates.\n");
exit(1);
}
#if 1
for(int j = 0; j < num_cands; ++j) {
int offset = strlen(sdp_buf);
char* start_addr = sdp_buf + offset;
krx_ice_candidate_to_string(sdp_buf, sizeof(sdp_buf)-offset, &cand[j]);
char* end_addr = sdp_buf + strlen(sdp_buf);
printf("--------\n%s\n--------------\n", sdp_buf);
}
offset = strlen(sdp_buf);
char* start_addr = sdp_buf + offset;
krx_ice_candidate_to_string(sdp_buf + offset, sizeof(sdp_buf)-offset, &cand[1]);
char* end_addr = sdp_buf + strlen(sdp_buf);
#endif
}
}
printf("SDP: %s\n", sdp_buf);
r = pj_ice_strans_init_ice(k->ice_st, PJ_ICE_SESS_ROLE_CONTROLLED, NULL, NULL);
CHECK_PJ_STATUS(r, "Error: cannot init ice session.\n", -4);
return 0;
}
/*
* Encode ICE information in SDP.
*/
static int encode_session(char buffer[], unsigned maxlen)
{
char *p = buffer;
unsigned comp;
int printed;
pj_str_t local_ufrag, local_pwd;
pj_status_t status;
/* Write "dummy" SDP v=, o=, s=, and t= lines */
PRINT("v=0\no=- 3414953978 3414953978 IN IP4 localhost\ns=ice\nt=0 0\n",
0, 0, 0, 0, 0, 0);
/* Get ufrag and pwd from current session */
pj_ice_strans_get_ufrag_pwd(icedemo.icest, &local_ufrag, &local_pwd,
NULL, NULL);
/* Write the a=ice-ufrag and a=ice-pwd attributes */
PRINT("a=ice-ufrag:%.*s\na=ice-pwd:%.*s\n",
(int)local_ufrag.slen,
local_ufrag.ptr,
(int)local_pwd.slen,
local_pwd.ptr,
0, 0);
/* Write each component */
for (comp=0; comp<icedemo.opt.comp_cnt; ++comp) {
unsigned j, cand_cnt;
pj_ice_sess_cand cand[PJ_ICE_ST_MAX_CAND];
char ipaddr[PJ_INET6_ADDRSTRLEN];
/* Get default candidate for the component */
status = pj_ice_strans_get_def_cand(icedemo.icest, comp+1, &cand[0]);
if (status != PJ_SUCCESS)
return -status;
/* Write the default address */
if (comp==0) {
/* For component 1, default address is in m= and c= lines */
PRINT("m=audio %d RTP/AVP 0\n"
"c=IN IP4 %s\n",
(int)pj_sockaddr_get_port(&cand[0].addr),
pj_sockaddr_print(&cand[0].addr, ipaddr,
sizeof(ipaddr), 0),
0, 0, 0, 0);
} else if (comp==1) {
/* For component 2, default address is in a=rtcp line */
PRINT("a=rtcp:%d IN IP4 %s\n",
(int)pj_sockaddr_get_port(&cand[0].addr),
pj_sockaddr_print(&cand[0].addr, ipaddr,
sizeof(ipaddr), 0),
0, 0, 0, 0);
} else {
/* For other components, we'll just invent this.. */
PRINT("a=Xice-defcand:%d IN IP4 %s\n",
(int)pj_sockaddr_get_port(&cand[0].addr),
pj_sockaddr_print(&cand[0].addr, ipaddr,
sizeof(ipaddr), 0),
0, 0, 0, 0);
}
/* Enumerate all candidates for this component */
status = pj_ice_strans_enum_cands(icedemo.icest, comp+1,
&cand_cnt, cand);
if (status != PJ_SUCCESS)
return -status;
/* And encode the candidates as SDP */
for (j=0; j<cand_cnt; ++j) {
printed = print_cand(p, maxlen - (p-buffer), &cand[j]);
if (printed < 0)
return -PJ_ETOOSMALL;
p += printed;
}
}
if (p == buffer+maxlen)
return -PJ_ETOOSMALL;
*p = '\0';
return p - buffer;
}
/* 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;
}
