static void
check_af (const char *name, int family, socklen_t addrlen)
{
struct sockaddr_storage addr;
uint8_t buf[100];
StunAgent agent;
StunMessage msg;
uint16_t known_attributes[] = {STUN_ATTRIBUTE_USERNAME, STUN_ATTRIBUTE_MESSAGE_INTEGRITY, STUN_ATTRIBUTE_ERROR_CODE, 0};
stun_agent_init (&agent, known_attributes,
STUN_COMPATIBILITY_RFC5389, STUN_AGENT_USAGE_USE_FINGERPRINT);
assert (addrlen <= sizeof (addr));
memset (&addr, 0, sizeof (addr));
stun_agent_init_request (&agent, &msg, buf, sizeof(buf), STUN_BINDING);
if (stun_message_append_addr (&msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
(struct sockaddr *) &addr, addrlen) !=
STUN_MESSAGE_RETURN_UNSUPPORTED_ADDRESS)
fatal ("Unknown address family test failed");
if (stun_message_append_xor_addr (&msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
&addr, addrlen) !=
STUN_MESSAGE_RETURN_UNSUPPORTED_ADDRESS)
fatal ("Unknown address family xor test failed");
addr.ss_family = family;
if (stun_message_append_addr (&msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
(struct sockaddr *) &addr, addrlen - 1) !=
STUN_MESSAGE_RETURN_INVALID)
fatal ("Too small %s sockaddr test failed", name);
if (stun_message_append_xor_addr (&msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
&addr, addrlen - 1) != STUN_MESSAGE_RETURN_INVALID)
fatal ("Too small %s sockaddr xor test failed", name);
if (stun_message_append_addr (&msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
(struct sockaddr *) &addr, addrlen) != STUN_MESSAGE_RETURN_SUCCESS)
fatal ("%s sockaddr test failed", name);
if (stun_message_append_xor_addr (&msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
&addr, addrlen) != STUN_MESSAGE_RETURN_SUCCESS)
fatal ("%s sockaddr xor test failed", name);
}
static int dgram_process (int sock, StunAgent *oldagent, StunAgent *newagent)
{
union {
struct sockaddr_storage storage;
struct sockaddr addr;
} addr;
socklen_t addr_len;
uint8_t buf[STUN_MAX_MESSAGE_SIZE];
size_t buf_len = 0;
size_t len = 0;
StunMessage request;
StunMessage response;
StunValidationStatus validation;
StunAgent *agent = NULL;
gint ret;
addr_len = sizeof (struct sockaddr_in);
recv_packet:
len = recvfrom (sock, buf, sizeof(buf), 0,
&addr.addr, &addr_len);
if (drop_stun_packets) {
g_debug ("Dropping STUN packet as requested");
return -1;
}
if (len == (size_t)-1) {
return -1;
}
validation = stun_agent_validate (newagent, &request, buf, len, NULL, 0);
if (validation == STUN_VALIDATION_SUCCESS) {
agent = newagent;
} else {
validation = stun_agent_validate (oldagent, &request, buf, len, NULL, 0);
agent = oldagent;
}
/* Unknown attributes */
if (validation == STUN_VALIDATION_UNKNOWN_REQUEST_ATTRIBUTE) {
buf_len = stun_agent_build_unknown_attributes_error (agent, &response, buf,
sizeof (buf), &request);
goto send_buf;
}
/* Mal-formatted packets */
if (validation != STUN_VALIDATION_SUCCESS ||
stun_message_get_class (&request) != STUN_REQUEST) {
goto recv_packet;
}
switch (stun_message_get_method (&request)) {
case STUN_BINDING:
stun_agent_init_response (agent, &response, buf, sizeof (buf), &request);
if (stun_message_has_cookie (&request))
stun_message_append_xor_addr (&response,
STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
&addr.storage, addr_len);
else
stun_message_append_addr (&response, STUN_ATTRIBUTE_MAPPED_ADDRESS,
&addr.addr, addr_len);
break;
case STUN_SHARED_SECRET:
case STUN_ALLOCATE:
case STUN_SET_ACTIVE_DST:
case STUN_CONNECT:
case STUN_OLD_SET_ACTIVE_DST:
case STUN_IND_DATA:
case STUN_IND_CONNECT_STATUS:
case STUN_CHANNELBIND:
default:
if (!stun_agent_init_error (agent, &response, buf, sizeof (buf),
&request, STUN_ERROR_BAD_REQUEST)) {
g_debug ("STUN error message not initialized properly");
g_assert_not_reached();
}
}
buf_len = stun_agent_finish_message (agent, &response, NULL, 0);
send_buf:
g_cancellable_cancel (global_cancellable);
g_debug ("Ready to send a STUN response");
g_assert (g_mutex_trylock (stun_mutex_ptr));
got_stun_packet = TRUE;
while (send_stun) {
g_debug ("Waiting for signal. State is %d", global_lagent_state);
g_cond_wait (stun_signal_ptr, stun_mutex_ptr);
}
g_mutex_unlock (stun_mutex_ptr);
len = sendto (sock, buf, buf_len, 0,
&addr.addr, addr_len);
g_debug ("STUN response sent");
drop_stun_packets = TRUE;
ret = (len < buf_len) ? -1 : 0;
return ret;
}
/** Various responses test */
static void responses (void)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof (addr);
ssize_t val;
size_t len;
int servfd, fd;
uint8_t buf[STUN_MAX_MESSAGE_SIZE];
uint8_t req[STUN_MAX_MESSAGE_SIZE];
size_t req_len;
StunAgent agent;
StunMessage msg;
StunMessage req_msg;
uint16_t known_attributes[] = {
STUN_ATTRIBUTE_MAPPED_ADDRESS,
STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
STUN_ATTRIBUTE_PRIORITY,
STUN_ATTRIBUTE_USERNAME,
STUN_ATTRIBUTE_MESSAGE_INTEGRITY,
STUN_ATTRIBUTE_ERROR_CODE, 0};
stun_agent_init (&agent, known_attributes,
STUN_COMPATIBILITY_RFC5389, 0);
/* Allocate a local UDP port for server */
servfd = listen_dgram ();
assert (servfd != -1);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
/* Allocate a client socket and connect to server */
fd = socket (addr.ss_family, SOCK_DGRAM, 0);
assert (fd != -1);
/* Send error response */
req_len = stun_usage_bind_create (&agent, &req_msg, req, sizeof(req));
assert (req_len > 0);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = sendto (fd, req, req_len, MSG_DONTWAIT | MSG_NOSIGNAL,
(struct sockaddr *)&addr, addrlen);
assert (val >= 0);
val = recvfrom (servfd, buf, 1000, MSG_DONTWAIT, NULL, 0);
assert (val >= 0);
assert (stun_agent_validate (&agent, &msg, buf, val, NULL, NULL)
== STUN_VALIDATION_SUCCESS);
stun_agent_init_error (&agent, &msg, buf, sizeof (buf),
&msg, STUN_ERROR_SERVER_ERROR);
len = stun_agent_finish_message (&agent, &msg, NULL, 0);
assert (len > 0);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = stun_usage_bind_process (&msg, (struct sockaddr *) &addr, &addrlen,
(struct sockaddr *) &addr, &addrlen);
assert (val == STUN_USAGE_BIND_RETURN_ERROR);
/* Send response with a no mapped address at all */
req_len = stun_usage_bind_create (&agent, &req_msg, req, sizeof(req));
assert (req_len > 0);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = sendto (fd, req, req_len, MSG_DONTWAIT | MSG_NOSIGNAL,
(struct sockaddr *)&addr, addrlen);
assert (val >= 0);
val = recvfrom (servfd, buf, 1000, MSG_DONTWAIT, NULL, 0);
assert (val >= 0);
assert (stun_agent_validate (&agent, &msg, buf, val, NULL, NULL)
== STUN_VALIDATION_SUCCESS);
stun_agent_init_response (&agent, &msg, buf, sizeof (buf), &msg);
len = stun_agent_finish_message (&agent, &msg, NULL, 0);
assert (len > 0);
assert (stun_agent_validate (&agent, &msg, buf, len, NULL, NULL)
== STUN_VALIDATION_SUCCESS);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = stun_usage_bind_process (&msg, (struct sockaddr *) &addr, &addrlen,
(struct sockaddr *) &addr, &addrlen);
assert (val == STUN_USAGE_BIND_RETURN_ERROR);
/* Send old-style response */
req_len = stun_usage_bind_create (&agent, &req_msg, req, sizeof(req));
assert (req_len > 0);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = sendto (fd, req, req_len, MSG_DONTWAIT | MSG_NOSIGNAL,
(struct sockaddr *)&addr, addrlen);
assert (val >= 0);
val = recvfrom (servfd, buf, 1000, MSG_DONTWAIT, NULL, 0);
assert (val >= 0);
assert (stun_agent_validate (&agent, &msg, buf, val, NULL, NULL)
== STUN_VALIDATION_SUCCESS);
stun_agent_init_response (&agent, &msg, buf, sizeof (buf), &msg);
assert (stun_message_append_addr (&msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
(struct sockaddr *) &addr, addrlen) == STUN_MESSAGE_RETURN_SUCCESS);
len = stun_agent_finish_message (&agent, &msg, NULL, 0);
assert (len > 0);
assert (stun_agent_validate (&agent, &msg, buf, len, NULL, NULL)
== STUN_VALIDATION_SUCCESS);
val = getsockname (servfd, (struct sockaddr *)&addr, &addrlen);
assert (val == 0);
val = stun_usage_bind_process (&msg, (struct sockaddr *) &addr, &addrlen,
(struct sockaddr *) &addr, &addrlen);
assert (val == STUN_USAGE_BIND_RETURN_SUCCESS);
/* End */
close (servfd);
val = close (fd);
assert (val == 0);
}
StunUsageIceReturn
stun_usage_ice_conncheck_create_reply (StunAgent *agent, StunMessage *req,
StunMessage *msg, uint8_t *buf, size_t *plen,
const struct sockaddr *src, socklen_t srclen,
bool *control, uint64_t tie,
StunUsageIceCompatibility compatibility)
{
const char *username = NULL;
uint16_t username_len;
size_t len = *plen;
uint64_t q;
StunMessageReturn val = STUN_MESSAGE_RETURN_SUCCESS;
StunUsageIceReturn ret = STUN_USAGE_ICE_RETURN_SUCCESS;
#define err( code ) \
stun_bind_error (agent, msg, buf, &len, req, code); \
*plen = len
*plen = 0;
stun_debug ("STUN Reply (buffer size = %u)...\n", (unsigned)len);
if (stun_message_get_class (req) != STUN_REQUEST)
{
stun_debug (" Unhandled non-request (class %u) message.\n",
stun_message_get_class (req));
return STUN_USAGE_ICE_RETURN_INVALID_REQUEST;
}
if (stun_message_get_method (req) != STUN_BINDING)
{
stun_debug (" Bad request (method %u) message.\n",
stun_message_get_method (req));
err (STUN_ERROR_BAD_REQUEST);
return STUN_USAGE_ICE_RETURN_INVALID_METHOD;
}
/* Role conflict handling */
assert (control != NULL);
if (stun_message_find64 (req, *control ? STUN_ATTRIBUTE_ICE_CONTROLLING
: STUN_ATTRIBUTE_ICE_CONTROLLED, &q) == STUN_MESSAGE_RETURN_SUCCESS)
{
stun_debug ("STUN Role Conflict detected:\n");
if (tie < q)
{
stun_debug (" switching role from \"controll%s\" to \"controll%s\"\n",
*control ? "ing" : "ed", *control ? "ed" : "ing");
*control = !*control;
ret = STUN_USAGE_ICE_RETURN_ROLE_CONFLICT;
}
else
{
stun_debug (" staying \"controll%s\" (sending error)\n",
*control ? "ing" : "ed");
err (STUN_ERROR_ROLE_CONFLICT);
return STUN_USAGE_ICE_RETURN_SUCCESS;
}
} else {
stun_debug ("STUN Role not specified by peer!\n");
}
if (stun_agent_init_response (agent, msg, buf, len, req) == FALSE) {
stun_debug ("Unable to create response\n");
goto failure;
}
if (compatibility == STUN_USAGE_ICE_COMPATIBILITY_MSN) {
StunTransactionId transid;
uint32_t magic_cookie;
stun_message_id (msg, transid);
magic_cookie = *((uint32_t *) transid);
val = stun_message_append_xor_addr_full (msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
src, srclen, htonl (magic_cookie));
} else if (stun_message_has_cookie (msg)) {
val = stun_message_append_xor_addr (msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
src, srclen);
} else {
val = stun_message_append_addr (msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
src, srclen);
}
if (val != STUN_MESSAGE_RETURN_SUCCESS) {
stun_debug (" Mapped address problem: %d\n", val);
goto failure;
}
username = (const char *)stun_message_find (req,
STUN_ATTRIBUTE_USERNAME, &username_len);
if (username) {
val = stun_message_append_bytes (msg, STUN_ATTRIBUTE_USERNAME,
username, username_len);
}
if (val != STUN_MESSAGE_RETURN_SUCCESS) {
stun_debug ("Error appending username: %d\n", val);
goto failure;
}
/* the stun agent will automatically use the password of the request */
len = stun_agent_finish_message (agent, msg, NULL, 0);
if (len == 0)
goto failure;
*plen = len;
stun_debug (" All done (response size: %u)\n", (unsigned)len);
return ret;
failure:
assert (*plen == 0);
stun_debug (" Fatal error formatting Response: %d\n", val);
switch (val)
{
case STUN_MESSAGE_RETURN_NOT_ENOUGH_SPACE:
return STUN_USAGE_ICE_RETURN_MEMORY_ERROR;
case STUN_MESSAGE_RETURN_INVALID:
case STUN_MESSAGE_RETURN_UNSUPPORTED_ADDRESS:
return STUN_USAGE_ICE_RETURN_INVALID_ADDRESS;
default:
return STUN_USAGE_ICE_RETURN_ERROR;
}
}
static int dgram_process (int sock, StunAgent *oldagent, StunAgent *newagent)
{
union {
struct sockaddr_storage storage;
struct sockaddr addr;
} addr;
socklen_t addr_len;
uint8_t buf[STUN_MAX_MESSAGE_SIZE];
size_t buf_len = 0;
size_t len = 0;
StunMessage request;
StunMessage response;
StunValidationStatus validation;
StunAgent *agent = NULL;
addr_len = sizeof (struct sockaddr_in);
len = recvfrom (sock, buf, sizeof(buf), 0, &addr.addr, &addr_len);
if (len == (size_t)-1)
return -1;
validation = stun_agent_validate (newagent, &request, buf, len, NULL, 0);
if (validation == STUN_VALIDATION_SUCCESS) {
agent = newagent;
}
else {
validation = stun_agent_validate (oldagent, &request, buf, len, NULL, 0);
agent = oldagent;
}
/* Unknown attributes */
if (validation == STUN_VALIDATION_UNKNOWN_REQUEST_ATTRIBUTE)
{
buf_len = stun_agent_build_unknown_attributes_error (agent, &response, buf,
sizeof (buf), &request);
goto send_buf;
}
/* Mal-formatted packets */
if (validation != STUN_VALIDATION_SUCCESS ||
stun_message_get_class (&request) != STUN_REQUEST) {
return -1;
}
switch (stun_message_get_method (&request))
{
case STUN_BINDING:
stun_agent_init_response (agent, &response, buf, sizeof (buf), &request);
if (stun_message_has_cookie (&request))
stun_message_append_xor_addr (&response,
STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS, &addr.addr, addr_len);
else
stun_message_append_addr (&response, STUN_ATTRIBUTE_MAPPED_ADDRESS,
&addr.addr, addr_len);
break;
case STUN_SHARED_SECRET:
case STUN_ALLOCATE:
case STUN_SEND:
case STUN_CONNECT:
case STUN_IND_SEND:
case STUN_IND_DATA:
case STUN_CREATEPERMISSION:
case STUN_CHANNELBIND:
default:
if (!stun_agent_init_error (agent, &response, buf, sizeof (buf),
&request, STUN_ERROR_BAD_REQUEST))
return -1;
}
buf_len = stun_agent_finish_message (agent, &response, NULL, 0);
send_buf:
len = sendto (sock, buf, buf_len, 0, &addr.addr, addr_len);
return (len < buf_len) ? -1 : 0;
}
static int dgram_process (int sock, StunAgent *oldagent, StunAgent *newagent)
{
struct sockaddr_storage addr;
uint8_t buf[STUN_MAX_MESSAGE_SIZE];
char ctlbuf[CMSG_SPACE (sizeof (struct in6_pktinfo))];
struct iovec iov = { buf, sizeof (buf) };
StunMessage request;
StunMessage response;
StunValidationStatus validation;
StunAgent *agent = NULL;
struct msghdr mh =
{
.msg_name = (struct sockaddr *)&addr,
.msg_namelen = sizeof (addr),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = ctlbuf,
.msg_controllen = sizeof (ctlbuf)
};
size_t len = recv_safe (sock, &mh);
if (len == (size_t)-1)
return -1;
validation = stun_agent_validate (newagent, &request, buf, len, NULL, 0);
if (validation == STUN_VALIDATION_SUCCESS) {
agent = newagent;
}
else {
validation = stun_agent_validate (oldagent, &request, buf, len, NULL, 0);
agent = oldagent;
}
/* Unknown attributes */
if (validation == STUN_VALIDATION_UNKNOWN_REQUEST_ATTRIBUTE)
{
stun_agent_build_unknown_attributes_error (agent, &response, buf,
sizeof (buf), &request);
goto send_buf;
}
/* Mal-formatted packets */
if (validation != STUN_VALIDATION_SUCCESS ||
stun_message_get_class (&request) != STUN_REQUEST) {
return -1;
}
switch (stun_message_get_method (&request))
{
case STUN_BINDING:
stun_agent_init_response (agent, &response, buf, sizeof (buf), &request);
if (stun_message_has_cookie (&request))
stun_message_append_xor_addr (&response,
STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
mh.msg_name, mh.msg_namelen);
else
stun_message_append_addr (&response, STUN_ATTRIBUTE_MAPPED_ADDRESS,
mh.msg_name, mh.msg_namelen);
break;
default:
stun_agent_init_error (agent, &response, buf, sizeof (buf),
&request, STUN_ERROR_BAD_REQUEST);
}
iov.iov_len = stun_agent_finish_message (agent, &response, NULL, 0);
send_buf:
len = send_safe (sock, &mh);
return (len < iov.iov_len) ? -1 : 0;
}
static int run (int family, int protocol, unsigned port)
{
StunAgent oldagent;
StunAgent newagent;
int sock = listen_socket (family, SOCK_DGRAM, protocol, port);
if (sock == -1)
return -1;
stun_agent_init (&oldagent, known_attributes,
STUN_COMPATIBILITY_RFC3489, 0);
stun_agent_init (&newagent, known_attributes,
STUN_COMPATIBILITY_RFC5389, STUN_AGENT_USAGE_USE_FINGERPRINT);
for (;;)
dgram_process (sock, &oldagent, &newagent);
}
StunUsageIceReturn
stun_usage_ice_conncheck_create_reply (StunAgent *agent, StunMessage *req,
StunMessage *msg, uint8_t *buf, size_t *plen,
const struct sockaddr_storage *src, socklen_t srclen,
bool *control, uint64_t tie,
StunUsageIceCompatibility compatibility)
{
const char *username = NULL;
uint16_t username_len;
size_t len = *plen;
uint64_t q;
StunMessageReturn val = STUN_MESSAGE_RETURN_SUCCESS;
StunUsageIceReturn ret = STUN_USAGE_ICE_RETURN_SUCCESS;
#define err( code ) \
stun_bind_error (agent, msg, buf, &len, req, code); \
*plen = len
*plen = 0;
stun_debug ("STUN Reply (buffer size = %u)...", (unsigned)len);
if (stun_message_get_class (req) != STUN_REQUEST)
{
stun_debug (" Unhandled non-request (class %u) message.",
stun_message_get_class (req));
return STUN_USAGE_ICE_RETURN_INVALID_REQUEST;
}
if (stun_message_get_method (req) != STUN_BINDING)
{
stun_debug (" Bad request (method %u) message.",
stun_message_get_method (req));
err (STUN_ERROR_BAD_REQUEST);
return STUN_USAGE_ICE_RETURN_INVALID_METHOD;
}
/* Role conflict handling */
assert (control != NULL);
if (stun_message_find64 (req, *control ? STUN_ATTRIBUTE_ICE_CONTROLLING
: STUN_ATTRIBUTE_ICE_CONTROLLED, &q) == STUN_MESSAGE_RETURN_SUCCESS)
{
/* we have the ice-controlling/controlled attribute,
* and there's a role conflict
*/
stun_debug ("STUN Role Conflict detected:");
/* According to ICE RFC 5245, section 7.2.1.1, we consider the four
* possible cases when a role conflict is detected: two cases are
* resolved by switching role locally, and the two other cases are
* handled by responding with a STUN error.
*/
if ((tie < q && *control) || (tie >= q && !*control))
{
stun_debug (" switching role from \"controll%s\" to \"controll%s\"",
*control ? "ing" : "ed", *control ? "ed" : "ing");
*control = !*control;
ret = STUN_USAGE_ICE_RETURN_ROLE_CONFLICT;
}
else
{
stun_debug (" staying \"controll%s\" (sending error)",
*control ? "ing" : "ed");
err (STUN_ERROR_ROLE_CONFLICT);
return STUN_USAGE_ICE_RETURN_ROLE_CONFLICT;
}
} else {
if (stun_message_find64 (req, *control ? STUN_ATTRIBUTE_ICE_CONTROLLED
: STUN_ATTRIBUTE_ICE_CONTROLLING, &q) != STUN_MESSAGE_RETURN_SUCCESS)
{
/* we don't have the expected ice-controlling/controlled
* attribute
*/
if (compatibility == STUN_USAGE_ICE_COMPATIBILITY_RFC5245 ||
compatibility == STUN_USAGE_ICE_COMPATIBILITY_MSICE2)
{
stun_debug ("STUN Role not specified by peer!");
}
}
}
if (stun_agent_init_response (agent, msg, buf, len, req) == FALSE) {
stun_debug ("Unable to create response");
goto failure;
}
if (compatibility == STUN_USAGE_ICE_COMPATIBILITY_MSN) {
union {
StunTransactionId transid;
uint32_t magic_cookie;
} conv;
stun_message_id (msg, conv.transid);
val = stun_message_append_xor_addr_full (msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
src, srclen, htonl (conv.magic_cookie));
} else if (stun_message_has_cookie (msg) &&
compatibility != STUN_USAGE_ICE_COMPATIBILITY_GOOGLE) {
val = stun_message_append_xor_addr (msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS,
src, srclen);
} else {
val = stun_message_append_addr (msg, STUN_ATTRIBUTE_MAPPED_ADDRESS,
(struct sockaddr *) src, srclen);
}
if (val != STUN_MESSAGE_RETURN_SUCCESS) {
stun_debug (" Mapped address problem: %d", val);
goto failure;
}
username = (const char *)stun_message_find (req,
STUN_ATTRIBUTE_USERNAME, &username_len);
if (username) {
val = stun_message_append_bytes (msg, STUN_ATTRIBUTE_USERNAME,
username, username_len);
}
if (val != STUN_MESSAGE_RETURN_SUCCESS) {
stun_debug ("Error appending username: %d", val);
goto failure;
}
if (compatibility == STUN_USAGE_ICE_COMPATIBILITY_MSICE2) {
val = stun_message_append32 (msg,
STUN_ATTRIBUTE_MS_IMPLEMENTATION_VERSION, 2);
if (val != STUN_MESSAGE_RETURN_SUCCESS) {
stun_debug ("Error appending implementation version: %d", val);
goto failure;
}
}
/* the stun agent will automatically use the password of the request */
len = stun_agent_finish_message (agent, msg, NULL, 0);
if (len == 0)
goto failure;
*plen = len;
stun_debug (" All done (response size: %u)", (unsigned)len);
return ret;
failure:
assert (*plen == 0);
stun_debug (" Fatal error formatting Response: %d", val);
switch (val)
{
case STUN_MESSAGE_RETURN_NOT_ENOUGH_SPACE:
return STUN_USAGE_ICE_RETURN_MEMORY_ERROR;
case STUN_MESSAGE_RETURN_INVALID:
case STUN_MESSAGE_RETURN_UNSUPPORTED_ADDRESS:
return STUN_USAGE_ICE_RETURN_INVALID_ADDRESS;
case STUN_MESSAGE_RETURN_SUCCESS:
assert (0); /* shouldn’t be reached */
case STUN_MESSAGE_RETURN_NOT_FOUND:
default:
return STUN_USAGE_ICE_RETURN_ERROR;
}
}
