/**
* @brief Open a LLSocket and do a blocking connect to the chosen host.
*
* Checks for a successful connection, and makes sure the connection is closed if it fails.
*
* @param host The host to open the connection to.
* @return The created socket. Will evaluate as NULL if the connection is unsuccessful.
*/
static LLSocket::ptr_t tcp_open_channel(LLHost host)
{
LLSocket::ptr_t socket = LLSocket::create(NULL, LLSocket::STREAM_TCP);
bool connected = socket->blockingConnect(host);
if (!connected)
{
tcp_close_channel(&socket);
}
return socket;
}
// static
LLSocket::ptr_t LLSocket::create(apr_socket_t* socket, apr_pool_t* pool)
{
LLSocket::ptr_t rv;
if(!socket)
{
return rv;
}
rv = ptr_t(new LLSocket(socket, pool));
rv->mPort = PORT_EPHEMERAL;
rv->setNonBlocking();
return rv;
}
// static
LLSocket::ptr_t LLSocket::create(apr_socket_t* socket, apr_pool_t* pool)
{
LLMemType m1(LLMemType::MTYPE_IO_TCP);
LLSocket::ptr_t rv;
if(!socket)
{
return rv;
}
rv = ptr_t(new LLSocket(socket, pool));
rv->mPort = PORT_EPHEMERAL;
rv->setOptions();
return rv;
}
/**
* @brief Send one TCP packet and receive one in return.
*
* This operation is done synchronously with a 1000ms timeout. Therefore, it should not be used when a blocking
* operation would impact the operation of the viewer.
*
* @param handle_ptr Pointer to a connected LLSocket of type STREAM_TCP.
* @param dataout Data to send.
* @param outlen Length of dataout.
* @param datain Buffer for received data. Undefined if return value is not APR_SUCCESS.
* @param maxinlen Maximum possible length of received data. Short reads are allowed.
* @return Indicates APR status code of exchange. APR_SUCCESS if exchange was successful, -1 if invalid data length was received.
*/
static apr_status_t tcp_blocking_handshake(LLSocket::ptr_t handle, char * dataout, apr_size_t outlen, char * datain, apr_size_t maxinlen)
{
apr_socket_t* apr_socket = handle->getSocket();
apr_status_t rv = APR_SUCCESS;
apr_size_t expected_len = outlen;
handle->setBlocking(1000);
rv = apr_socket_send(apr_socket, dataout, &outlen);
if (APR_SUCCESS != rv)
{
LL_WARNS("Proxy") << "Error sending data to proxy control channel, status: " << rv << LL_ENDL;
ll_apr_warn_status(rv);
}
else if (expected_len != outlen)
{
LL_WARNS("Proxy") << "Incorrect data length sent. Expected: " << expected_len <<
" Sent: " << outlen << LL_ENDL;
rv = -1;
}
if (APR_SUCCESS == rv)
{
expected_len = maxinlen;
rv = apr_socket_recv(apr_socket, datain, &maxinlen);
if (rv != APR_SUCCESS)
{
LL_WARNS("Proxy") << "Error receiving data from proxy control channel, status: " << rv << LL_ENDL;
ll_apr_warn_status(rv);
}
else if (expected_len < maxinlen)
{
LL_WARNS("Proxy") << "Incorrect data length received. Expected: " << expected_len <<
" Received: " << maxinlen << LL_ENDL;
rv = -1;
}
}
handle->setNonBlocking();
return rv;
}
// static
LLSocket::ptr_t LLSocket::create(apr_status_t& status, LLSocket::ptr_t& listen_socket)
{
if (!listen_socket->getSocket())
{
status = APR_ENOSOCKET;
return LLSocket::ptr_t();
}
LLSocket::ptr_t rv(new LLSocket);
LL_DEBUGS() << "accepting socket" << LL_ENDL;
status = apr_socket_accept(&rv->mSocket, listen_socket->getSocket(), rv->mPool());
if (status != APR_SUCCESS)
{
rv->mSocket = NULL;
rv.reset();
return rv;
}
rv->mPort = PORT_EPHEMERAL;
rv->setNonBlocking();
return rv;
}
// static
LLSocket::ptr_t LLSocket::create(apr_status_t& status, LLSocket::ptr_t& listen_socket)
{
LLMemType m1(LLMemType::MTYPE_IO_TCP);
if (!listen_socket->getSocket())
{
status = APR_ENOSOCKET;
return LLSocket::ptr_t();
}
LLSocket::ptr_t rv(new LLSocket);
lldebugs << "accepting socket" << llendl;
status = apr_socket_accept(&rv->mSocket, listen_socket->getSocket(), rv->mPool());
if (status != APR_SUCCESS)
{
rv->mSocket = NULL;
rv.reset();
return rv;
}
rv->mPort = PORT_EPHEMERAL;
rv->setNonBlocking();
return rv;
}
// static
LLSocket::ptr_t LLSocket::create(apr_pool_t* pool, EType type, U16 port)
{
LLMemType m1(LLMemType::MTYPE_IO_TCP);
LLSocket::ptr_t rv;
apr_socket_t* socket = NULL;
apr_pool_t* new_pool = NULL;
apr_status_t status = APR_EGENERAL;
// create a pool for the socket
status = apr_pool_create(&new_pool, pool);
if(ll_apr_warn_status(status))
{
if(new_pool) apr_pool_destroy(new_pool);
return rv;
}
if(STREAM_TCP == type)
{
status = apr_socket_create(
&socket,
APR_INET,
SOCK_STREAM,
APR_PROTO_TCP,
new_pool);
}
else if(DATAGRAM_UDP == type)
{
status = apr_socket_create(
&socket,
APR_INET,
SOCK_DGRAM,
APR_PROTO_UDP,
new_pool);
}
else
{
if(new_pool) apr_pool_destroy(new_pool);
return rv;
}
if(ll_apr_warn_status(status))
{
if(new_pool) apr_pool_destroy(new_pool);
return rv;
}
rv = ptr_t(new LLSocket(socket, new_pool));
if(port > 0)
{
apr_sockaddr_t* sa = NULL;
status = apr_sockaddr_info_get(
&sa,
APR_ANYADDR,
APR_UNSPEC,
port,
0,
new_pool);
if(ll_apr_warn_status(status))
{
rv.reset();
return rv;
}
// This allows us to reuse the address on quick down/up. This
// is unlikely to create problems.
ll_apr_warn_status(apr_socket_opt_set(socket, APR_SO_REUSEADDR, 1));
status = apr_socket_bind(socket, sa);
if(ll_apr_warn_status(status))
{
rv.reset();
return rv;
}
lldebugs << "Bound " << ((DATAGRAM_UDP == type) ? "udp" : "tcp")
<< " socket to port: " << sa->port << llendl;
if(STREAM_TCP == type)
{
// If it's a stream based socket, we need to tell the OS
// to keep a queue of incoming connections for ACCEPT.
lldebugs << "Setting listen state for socket." << llendl;
status = apr_socket_listen(
socket,
LL_DEFAULT_LISTEN_BACKLOG);
if(ll_apr_warn_status(status))
{
rv.reset();
return rv;
}
}
}
else
{
// we need to indicate that we have an ephemeral port if the
// previous calls were successful. It will
port = PORT_EPHEMERAL;
}
rv->mPort = port;
rv->setOptions();
return rv;
}