/*
* Dump STUN message to a printable string output.
*/
PJ_DEF(char*) pj_stun_msg_dump(const pj_stun_msg *msg,
char *buffer,
unsigned length,
unsigned *printed_len)
{
char *p, *end;
int len;
unsigned i;
PJ_ASSERT_RETURN(msg && buffer && length, NULL);
PJ_CHECK_STACK();
p = buffer;
end = buffer + length;
len = pj_ansi_snprintf(p, end-p, "STUN %s %s\n",
pj_stun_get_method_name(msg->hdr.type),
pj_stun_get_class_name(msg->hdr.type));
APPLY();
len = pj_ansi_snprintf(p, end-p,
" Hdr: length=%d, magic=%08x, tsx_id=%08x%08x%08x\n"
" Attributes:\n",
msg->hdr.length,
msg->hdr.magic,
*(pj_uint32_t*)&msg->hdr.tsx_id[0],
*(pj_uint32_t*)&msg->hdr.tsx_id[4],
*(pj_uint32_t*)&msg->hdr.tsx_id[8]);
APPLY();
for (i=0; i<msg->attr_count; ++i) {
len = print_attr(p, (unsigned)(end-p), msg->attr[i]);
APPLY();
}
on_return:
*p = '\0';
if (printed_len)
*printed_len = (unsigned)(p-buffer);
return buffer;
#undef APPLY
}
static pj_bool_t turn_on_data_recvfrom(pj_activesock_t *asock,
void *data,
pj_size_t size,
const pj_sockaddr_t *src_addr,
int addr_len,
pj_status_t status)
{
test_server *test_srv;
pj_pool_t *pool;
turn_allocation *alloc;
pj_stun_msg *req, *resp = NULL;
pj_str_t auth_key = { NULL, 0 };
char client_info[PJ_INET6_ADDRSTRLEN+10];
unsigned i;
pj_ssize_t len;
if (status != PJ_SUCCESS)
return PJ_TRUE;
pj_sockaddr_print(src_addr, client_info, sizeof(client_info), 3);
test_srv = (test_server*) pj_activesock_get_user_data(asock);
pool = pj_pool_create(test_srv->stun_cfg->pf, NULL, 512, 512, NULL);
/* Find the client */
for (i=0; i<test_srv->turn_alloc_cnt; i++) {
if (pj_sockaddr_cmp(&test_srv->turn_alloc[i].client_addr, src_addr)==0)
break;
}
if (pj_stun_msg_check((pj_uint8_t*)data, size, PJ_STUN_NO_FINGERPRINT_CHECK)!=PJ_SUCCESS) {
/* Not STUN message, this probably is a ChannelData */
pj_turn_channel_data cd;
const pj_turn_channel_data *pcd = (const pj_turn_channel_data*)data;
pj_ssize_t sent;
if (i==test_srv->turn_alloc_cnt) {
/* Invalid data */
PJ_LOG(1,(THIS_FILE,
"TURN Server received strayed data"));
goto on_return;
}
alloc = &test_srv->turn_alloc[i];
cd.ch_number = pj_ntohs(pcd->ch_number);
cd.length = pj_ntohs(pcd->length);
/* For UDP check the packet length */
if (size < cd.length+sizeof(cd)) {
PJ_LOG(1,(THIS_FILE,
"TURN Server: ChannelData discarded: UDP size error"));
goto on_return;
}
/* Lookup peer */
for (i=0; i<alloc->perm_cnt; ++i) {
if (alloc->chnum[i] == cd.ch_number)
break;
}
if (i==alloc->perm_cnt) {
PJ_LOG(1,(THIS_FILE,
"TURN Server: ChannelData discarded: invalid channel number"));
goto on_return;
}
/* Relay the data to peer */
sent = cd.length;
pj_activesock_sendto(alloc->sock, &alloc->send_key,
pcd+1, &sent, 0,
&alloc->perm[i],
pj_sockaddr_get_len(&alloc->perm[i]));
/* Done */
goto on_return;
}
status = pj_stun_msg_decode(pool, (pj_uint8_t*)data, size,
PJ_STUN_IS_DATAGRAM | PJ_STUN_CHECK_PACKET |
PJ_STUN_NO_FINGERPRINT_CHECK,
&req, NULL, NULL);
if (status != PJ_SUCCESS) {
char errmsg[PJ_ERR_MSG_SIZE];
pj_strerror(status, errmsg, sizeof(errmsg));
PJ_LOG(1,("", "STUN message decode error from client %s: %s", client_info, errmsg));
goto on_return;
}
if (i==test_srv->turn_alloc_cnt) {
/* New client */
//pj_str_t ip_addr;
pj_stun_username_attr *uname;
pj_activesock_cb alloc_sock_cb;
turn_allocation *alloc;
/* Must be Allocate request */
if (req->hdr.type != PJ_STUN_ALLOCATE_REQUEST) {
PJ_LOG(1,(THIS_FILE, "Invalid %s %s from client %s",
pj_stun_get_method_name(req->hdr.type),
pj_stun_get_class_name(req->hdr.type),
client_info));
if (PJ_STUN_IS_REQUEST(req->hdr.type))
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_BAD_REQUEST, NULL, &resp);
goto send_pkt;
}
test_srv->turn_stat.rx_allocate_cnt++;
/* Skip if we're not responding to Allocate request */
if (!test_srv->turn_respond_allocate)
return PJ_TRUE;
/* Check if we have too many clients */
if (test_srv->turn_alloc_cnt == MAX_TURN_ALLOC) {
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_INSUFFICIENT_CAPACITY, NULL, &resp);
goto send_pkt;
}
/* Get USERNAME attribute */
uname = (pj_stun_username_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_USERNAME, 0);
/* Reject if it doesn't have MESSAGE-INTEGRITY or USERNAME attributes or
* the user is incorrect
*/
if (pj_stun_msg_find_attr(req, PJ_STUN_ATTR_MESSAGE_INTEGRITY, 0) == NULL ||
uname==NULL || pj_stricmp2(&uname->value, TURN_USERNAME) != 0)
{
pj_str_t tmp;
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_UNAUTHORIZED, NULL, &resp);
pj_stun_msg_add_string_attr(pool, resp, PJ_STUN_ATTR_REALM, &test_srv->domain);
pj_stun_msg_add_string_attr(pool, resp, PJ_STUN_ATTR_NONCE, pj_cstr(&tmp, TURN_NONCE));
goto send_pkt;
}
pj_bzero(&alloc_sock_cb, sizeof(alloc_sock_cb));
alloc_sock_cb.on_data_recvfrom = &alloc_on_data_recvfrom;
/* Create allocation */
alloc = &test_srv->turn_alloc[test_srv->turn_alloc_cnt];
alloc->perm_cnt = 0;
alloc->test_srv = test_srv;
pj_memcpy(&alloc->client_addr, src_addr, addr_len);
pj_ioqueue_op_key_init(&alloc->send_key, sizeof(alloc->send_key));
alloc->pool = pj_pool_create(test_srv->stun_cfg->pf, "alloc", 512, 512, NULL);
/* Create relay socket */
pj_sockaddr_in_init(&alloc->alloc_addr.ipv4, NULL, 0);
pj_gethostip(pj_AF_INET(), &alloc->alloc_addr);
status = pj_activesock_create_udp(alloc->pool, &alloc->alloc_addr, NULL,
test_srv->stun_cfg->ioqueue,
&alloc_sock_cb, alloc,
&alloc->sock, &alloc->alloc_addr);
if (status != PJ_SUCCESS) {
pj_pool_release(alloc->pool);
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_SERVER_ERROR, NULL, &resp);
goto send_pkt;
}
//pj_sockaddr_set_str_addr(pj_AF_INET(), &alloc->alloc_addr, &ip_addr);
pj_activesock_set_user_data(alloc->sock, alloc);
status = pj_activesock_start_recvfrom(alloc->sock, alloc->pool, 1500, 0);
if (status != PJ_SUCCESS) {
pj_activesock_close(alloc->sock);
pj_pool_release(alloc->pool);
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_SERVER_ERROR, NULL, &resp);
goto send_pkt;
}
/* Create Data indication */
status = pj_stun_msg_create(alloc->pool, PJ_STUN_DATA_INDICATION,
PJ_STUN_MAGIC, NULL, &alloc->data_ind);
if (status != PJ_SUCCESS) {
pj_activesock_close(alloc->sock);
pj_pool_release(alloc->pool);
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_SERVER_ERROR, NULL, &resp);
goto send_pkt;
}
pj_stun_msg_add_sockaddr_attr(alloc->pool, alloc->data_ind,
PJ_STUN_ATTR_XOR_PEER_ADDR, PJ_TRUE,
&alloc->alloc_addr,
pj_sockaddr_get_len(&alloc->alloc_addr));
pj_stun_msg_add_binary_attr(alloc->pool, alloc->data_ind,
PJ_STUN_ATTR_DATA, (pj_uint8_t*)"", 1);
/* Create response */
resp = create_success_response(test_srv, alloc, req, pool, 600, &auth_key);
if (resp == NULL) {
pj_activesock_close(alloc->sock);
pj_pool_release(alloc->pool);
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_SERVER_ERROR, NULL, &resp);
goto send_pkt;
}
++test_srv->turn_alloc_cnt;
} else {
alloc = &test_srv->turn_alloc[i];
if (req->hdr.type == PJ_STUN_ALLOCATE_REQUEST) {
test_srv->turn_stat.rx_allocate_cnt++;
/* Skip if we're not responding to Allocate request */
if (!test_srv->turn_respond_allocate)
return PJ_TRUE;
resp = create_success_response(test_srv, alloc, req, pool, 0, &auth_key);
} else if (req->hdr.type == PJ_STUN_REFRESH_REQUEST) {
pj_stun_lifetime_attr *lf_attr;
test_srv->turn_stat.rx_refresh_cnt++;
/* Skip if we're not responding to Refresh request */
if (!test_srv->turn_respond_refresh)
return PJ_TRUE;
lf_attr = (pj_stun_lifetime_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_LIFETIME, 0);
if (lf_attr && lf_attr->value != 0) {
resp = create_success_response(test_srv, alloc, req, pool, 600, &auth_key);
pj_array_erase(test_srv->turn_alloc, sizeof(test_srv->turn_alloc[0]),
test_srv->turn_alloc_cnt, i);
--test_srv->turn_alloc_cnt;
} else
resp = create_success_response(test_srv, alloc, req, pool, 0, &auth_key);
} else if (req->hdr.type == PJ_STUN_CREATE_PERM_REQUEST) {
for (i=0; i<req->attr_count; ++i) {
if (req->attr[i]->type == PJ_STUN_ATTR_XOR_PEER_ADDR) {
pj_stun_xor_peer_addr_attr *pa = (pj_stun_xor_peer_addr_attr*)req->attr[i];
unsigned j;
for (j=0; j<alloc->perm_cnt; ++j) {
if (pj_sockaddr_cmp(&alloc->perm[j], &pa->sockaddr)==0)
break;
}
if (j==alloc->perm_cnt && alloc->perm_cnt < MAX_TURN_PERM) {
char peer_info[PJ_INET6_ADDRSTRLEN];
pj_sockaddr_print(&pa->sockaddr, peer_info, sizeof(peer_info), 3);
pj_sockaddr_cp(&alloc->perm[alloc->perm_cnt], &pa->sockaddr);
++alloc->perm_cnt;
PJ_LOG(5,("", "Permission %s added to client %s, perm_cnt=%d",
peer_info, client_info, alloc->perm_cnt));
}
}
}
resp = create_success_response(test_srv, alloc, req, pool, 0, &auth_key);
} else if (req->hdr.type == PJ_STUN_SEND_INDICATION) {
pj_stun_xor_peer_addr_attr *pa;
pj_stun_data_attr *da;
test_srv->turn_stat.rx_send_ind_cnt++;
pa = (pj_stun_xor_peer_addr_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_XOR_PEER_ADDR, 0);
da = (pj_stun_data_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_DATA, 0);
if (pa && da) {
unsigned j;
char peer_info[PJ_INET6_ADDRSTRLEN];
pj_ssize_t sent;
pj_sockaddr_print(&pa->sockaddr, peer_info, sizeof(peer_info), 3);
for (j=0; j<alloc->perm_cnt; ++j) {
if (pj_sockaddr_cmp(&alloc->perm[j], &pa->sockaddr)==0)
break;
}
if (j==alloc->perm_cnt) {
PJ_LOG(5,("", "SendIndication to %s is rejected (no permission)",
peer_info, client_info, alloc->perm_cnt));
} else {
PJ_LOG(5,(THIS_FILE, "Relaying %d bytes data from client %s to peer %s, "
"perm_cnt=%d",
da->length, client_info, peer_info, alloc->perm_cnt));
sent = da->length;
pj_activesock_sendto(alloc->sock, &alloc->send_key,
da->data, &sent, 0,
&pa->sockaddr,
pj_sockaddr_get_len(&pa->sockaddr));
}
} else {
PJ_LOG(1,(THIS_FILE, "Invalid Send Indication from %s", client_info));
}
} else if (req->hdr.type == PJ_STUN_CHANNEL_BIND_REQUEST) {
pj_stun_xor_peer_addr_attr *pa;
pj_stun_channel_number_attr *cna;
unsigned j, cn;
pa = (pj_stun_xor_peer_addr_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_XOR_PEER_ADDR, 0);
cna = (pj_stun_channel_number_attr*)
pj_stun_msg_find_attr(req, PJ_STUN_ATTR_CHANNEL_NUMBER, 0);
cn = PJ_STUN_GET_CH_NB(cna->value);
resp = create_success_response(test_srv, alloc, req, pool, 0, &auth_key);
for (j=0; j<alloc->perm_cnt; ++j) {
if (pj_sockaddr_cmp(&alloc->perm[j], &pa->sockaddr)==0)
break;
}
if (i==alloc->perm_cnt) {
if (alloc->perm_cnt==MAX_TURN_PERM) {
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_INSUFFICIENT_CAPACITY, NULL, &resp);
goto send_pkt;
}
pj_sockaddr_cp(&alloc->perm[i], &pa->sockaddr);
++alloc->perm_cnt;
}
alloc->chnum[i] = cn;
resp = create_success_response(test_srv, alloc, req, pool, 0, &auth_key);
} else if (PJ_STUN_IS_REQUEST(req->hdr.type)) {
pj_stun_msg_create_response(pool, req, PJ_STUN_SC_BAD_REQUEST, NULL, &resp);
}
}
send_pkt:
if (resp) {
status = pj_stun_msg_encode(resp, (pj_uint8_t*)data, MAX_STUN_PKT,
0, &auth_key, &size);
if (status != PJ_SUCCESS)
goto on_return;
len = size;
status = pj_activesock_sendto(asock, &test_srv->send_key, data, &len,
0, src_addr, addr_len);
}
on_return:
pj_pool_release(pool);
return PJ_TRUE;
}
