/*!
* @brief Allocates a streaming TCP server channel.
* @param remote Pointer to the remote instance.
* @param packet Pointer to the request packet.
* @returns Indication of success or failure.
* @retval ERROR_SUCCESS Opening the server channel completed successfully.
*/
DWORD request_net_tcp_server_channel_open(Remote * remote, Packet * packet)
{
DWORD dwResult = ERROR_SUCCESS;
TcpServerContext * ctx = NULL;
Packet * response = NULL;
char * localHost = NULL;
StreamChannelOps chops = { 0 };
USHORT localPort = 0;
BOOL v4Fallback = FALSE;
do
{
response = packet_create_response(packet);
if (!response)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. response == NULL", ERROR_NOT_ENOUGH_MEMORY);
}
ctx = (TcpServerContext *)malloc(sizeof(TcpServerContext));
if (!ctx)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. ctx == NULL", ERROR_NOT_ENOUGH_MEMORY);
}
memset(ctx, 0, sizeof(TcpServerContext));
ctx->remote = remote;
localPort = (USHORT)(packet_get_tlv_value_uint(packet, TLV_TYPE_LOCAL_PORT) & 0xFFFF);
if (!localPort)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. localPort == NULL", ERROR_INVALID_HANDLE);
}
localHost = packet_get_tlv_value_string(packet, TLV_TYPE_LOCAL_HOST);
ctx->fd = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, 0, 0, 0);
if (ctx->fd == INVALID_SOCKET)
{
v4Fallback = TRUE;
}
else
{
int no = 0;
if (setsockopt(ctx->fd, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&no, sizeof(no)) == SOCKET_ERROR)
{
// fallback to ipv4 - we're probably running on Windows XP or earlier here, which means that to
// support IPv4 and IPv6 we'd need to create two separate sockets. IPv6 on XP isn't that common
// so instead, we'll just revert back to v4 and listen on that one address instead.
closesocket(ctx->fd);
v4Fallback = TRUE;
}
}
struct sockaddr_in6 sockAddr = { 0 };
DWORD sockAddrSize = 0;
if (v4Fallback)
{
struct sockaddr_in* v4Addr = (struct sockaddr_in*)&sockAddr;
v4Addr->sin_addr.s_addr = localHost == NULL ? htons(INADDR_ANY) : inet_addr(localHost);
v4Addr->sin_family = AF_INET;
v4Addr->sin_port = htons(localPort);
sockAddrSize = sizeof(struct sockaddr_in);
}
else
{
// TODO: add IPv6 address binding support
sockAddr.sin6_addr = in6addr_any;
sockAddr.sin6_family = AF_INET6;
sockAddr.sin6_port = htons(localPort);
sockAddrSize = sizeof(struct sockaddr_in6);
}
if (bind(ctx->fd, (SOCKADDR *)&sockAddr, sockAddrSize) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. bind failed");
}
if (listen(ctx->fd, SOMAXCONN) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. listen failed");
}
ctx->notify = WSACreateEvent();
if (ctx->notify == WSA_INVALID_EVENT)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. WSACreateEvent failed");
}
if (WSAEventSelect(ctx->fd, ctx->notify, FD_ACCEPT) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. WSAEventSelect failed");
}
ctx->ipv6 = !v4Fallback;
memset(&chops, 0, sizeof(StreamChannelOps));
chops.native.context = ctx;
chops.native.close = tcp_channel_server_close;
ctx->channel = channel_create_stream(0, CHANNEL_FLAG_SYNCHRONOUS, &chops);
if (!ctx->channel)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. channel_create_stream failed", ERROR_INVALID_HANDLE);
}
scheduler_insert_waitable(ctx->notify, ctx, NULL, (WaitableNotifyRoutine)tcp_channel_server_notify, NULL);
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID, channel_get_id(ctx->channel));
dprintf("[TCP-SERVER] request_net_tcp_server_channel_open. tcp server %s:%d on channel %d", localHost, localPort, channel_get_id(ctx->channel));
} while (0);
packet_transmit_response(dwResult, remote, response);
do
{
if (dwResult == ERROR_SUCCESS)
{
break;
}
dprintf("[TCP-SERVER] Error encountered %u 0x%x", dwResult, dwResult);
if (!ctx)
{
break;
}
if (ctx->fd)
{
dprintf("[TCP-SERVER] Destroying socket");
closesocket(ctx->fd);
}
if (ctx->channel)
{
dprintf("[TCP-SERVER] Destroying channel");
channel_destroy(ctx->channel, packet);
}
free(ctx);
} while (0);
return dwResult;
}
/*
* Creates a connection to a remote host and builds a logical channel to
* represent it.
*
*/
DWORD create_tcp_client_channel(Remote *remote, LPCSTR remoteHost, USHORT remotePort, Channel **outChannel)
{
StreamChannelOps chops;
TcpClientContext *ctx = NULL;
DWORD result = ERROR_SUCCESS;
Channel *channel = NULL;
struct sockaddr_in s;
SOCKET clientFd = 0;
if (outChannel)
*outChannel = NULL;
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d", remoteHost, remotePort );
do
{
// Allocate a client socket
if ((clientFd = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, 0)) == INVALID_SOCKET)
{
clientFd = 0;
result = GetLastError();
break;
}
s.sin_family = AF_INET;
s.sin_port = htons(remotePort);
s.sin_addr.s_addr = inet_addr(remoteHost);
// Resolve the host name locally
if (s.sin_addr.s_addr == (DWORD)-1)
{
struct hostent *h;
if (!(h = gethostbyname(remoteHost)))
{
result = GetLastError();
break;
}
memcpy(&s.sin_addr.s_addr, h->h_addr, h->h_length);
}
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d connecting...", remoteHost, remotePort );
// Try to connect to the host/port
if (connect(clientFd, (struct sockaddr *)&s, sizeof(s)) == SOCKET_ERROR)
{
result = GetLastError();
break;
}
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d connected!", remoteHost, remotePort );
// Allocate the client context for tracking the connection
if (!(ctx = (TcpClientContext *)malloc( sizeof(TcpClientContext))))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Initialize the context attributes
memset(ctx, 0, sizeof(TcpClientContext));
ctx->remote = remote;
ctx->fd = clientFd;
// Initialize the channel operations structure
memset(&chops, 0, sizeof(chops));
chops.native.context = ctx;
chops.native.write = tcp_channel_client_write;
chops.native.close = tcp_channel_client_close;
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d creating the channel", remoteHost, remotePort );
// Allocate an uninitialized channel for associated with this connection
if (!(channel = channel_create_stream(0, 0,&chops)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Save the channel context association
ctx->channel = channel;
// Finally, create a waitable event and insert it into the scheduler's
// waitable list
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d creating the notify", remoteHost, remotePort );
if ((ctx->notify = WSACreateEvent()))
{
WSAEventSelect(ctx->fd, ctx->notify, FD_READ|FD_CLOSE);
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d created the notify %.8x", remoteHost, remotePort, ctx->notify );
scheduler_insert_waitable( ctx->notify, ctx, (WaitableNotifyRoutine)tcp_channel_client_local_notify);
}
} while (0);
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d all done", remoteHost, remotePort );
// Clean up on failure
if (result != ERROR_SUCCESS)
{
dprintf( "[TCP] create_tcp_client_channel. host=%s, port=%d cleaning up failed connection", remoteHost, remotePort );
if (ctx)
free_tcp_client_context(ctx);
if (clientFd)
closesocket(clientFd);
channel = NULL;
}
if (outChannel)
*outChannel = channel;
return result;
}
/*!
* @brief Create a TCP client channel from a socket.
* @param serverCtx Pointer to the TCP server context.
* @param sock The socket handle.
* @returns Pointer to the newly created client context.
*/
TcpClientContext * tcp_channel_server_create_client(TcpServerContext * serverCtx, SOCKET sock)
{
DWORD dwResult = ERROR_SUCCESS;
TcpClientContext * clientctx = NULL;
StreamChannelOps chops = { 0 };
do
{
if (!serverCtx)
{
BREAK_WITH_ERROR("[TCP-SERVER] tcp_channel_server_create_client. serverCtx == NULL", ERROR_INVALID_HANDLE);
}
clientctx = (TcpClientContext *)malloc(sizeof(TcpClientContext));
if (!clientctx)
{
BREAK_WITH_ERROR("[TCP-SERVER] tcp_channel_server_create_client. clientctx == NULL", ERROR_NOT_ENOUGH_MEMORY);
}
memset(clientctx, 0, sizeof(TcpClientContext));
clientctx->remote = serverCtx->remote;
clientctx->fd = sock;
clientctx->notify = WSACreateEvent();
if (clientctx->notify == WSA_INVALID_EVENT)
{
BREAK_ON_WSAERROR("[TCP-SERVER] tcp_channel_server_create_client. WSACreateEvent failed");
}
if (WSAEventSelect(clientctx->fd, clientctx->notify, FD_READ | FD_CLOSE) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] tcp_channel_server_create_client. WSAEventSelect failed");
}
memset(&chops, 0, sizeof(StreamChannelOps));
chops.native.context = clientctx;
chops.native.write = tcp_channel_client_write;
chops.native.close = tcp_channel_client_close;
clientctx->channel = channel_create_stream(0, 0, &chops);
if (!clientctx->channel)
{
BREAK_WITH_ERROR("[TCP-SERVER] tcp_channel_server_create_client. clientctx->channel == NULL", ERROR_INVALID_HANDLE);
}
dwResult = scheduler_insert_waitable(clientctx->notify, clientctx, NULL, (WaitableNotifyRoutine)tcp_channel_client_local_notify, NULL);
} while (0);
if (dwResult != ERROR_SUCCESS)
{
if (clientctx)
{
free(clientctx);
clientctx = NULL;
}
}
return clientctx;
}
/*!
* @brief Allocates a streaming TCP server channel.
* @param remote Pointer to the remote instance.
* @param packet Pointer to the request packet.
* @returns Indication of success or failure.
* @retval ERROR_SUCCESS Opening the server channel completed successfully.
*/
DWORD request_net_tcp_server_channel_open(Remote * remote, Packet * packet)
{
DWORD dwResult = ERROR_SUCCESS;
TcpServerContext * ctx = NULL;
Packet * response = NULL;
char * lhost = NULL;
SOCKADDR_IN saddr = { 0 };
StreamChannelOps chops = { 0 };
USHORT lport = 0;
do
{
response = packet_create_response(packet);
if (!response)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. response == NULL", ERROR_NOT_ENOUGH_MEMORY);
}
ctx = (TcpServerContext *)malloc(sizeof(TcpServerContext));
if (!ctx)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. ctx == NULL", ERROR_NOT_ENOUGH_MEMORY);
}
memset(ctx, 0, sizeof(TcpServerContext));
ctx->remote = remote;
lport = (USHORT)(packet_get_tlv_value_uint(packet, TLV_TYPE_LOCAL_PORT) & 0xFFFF);
if (!lport)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. lport == NULL", ERROR_INVALID_HANDLE);
}
lhost = packet_get_tlv_value_string(packet, TLV_TYPE_LOCAL_HOST);
if (!lhost)
{
lhost = "0.0.0.0";
}
ctx->fd = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, 0, 0);
if (ctx->fd == INVALID_SOCKET)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. WSASocket failed");
}
saddr.sin_family = AF_INET;
saddr.sin_port = htons(lport);
saddr.sin_addr.s_addr = inet_addr(lhost);
if (bind(ctx->fd, (SOCKADDR *)&saddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
{
#ifdef _WIN32
dwResult = WSAGetLastError();
if (dwResult != WSAEADDRNOTAVAIL)
#else
dwResult = errno;
if (dwResult != EADDRNOTAVAIL)
#endif
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. bind failed");
}
dprintf("[TCP-SERVER] Failed to bind to %s, trying 0.0.0.0 ...", lhost);
// try again, but this time bind to any/all interfaces.
lhost = "0.0.0.0";
saddr.sin_addr.s_addr = inet_addr(lhost);
if (bind(ctx->fd, (SOCKADDR *)&saddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. bind failed");
}
dwResult = ERROR_SUCCESS;
}
if (listen(ctx->fd, SOMAXCONN) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. listen failed");
}
ctx->notify = WSACreateEvent();
if (ctx->notify == WSA_INVALID_EVENT)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. WSACreateEvent failed");
}
if (WSAEventSelect(ctx->fd, ctx->notify, FD_ACCEPT) == SOCKET_ERROR)
{
BREAK_ON_WSAERROR("[TCP-SERVER] request_net_tcp_server_channel_open. WSAEventSelect failed");
}
memset(&chops, 0, sizeof(StreamChannelOps));
chops.native.context = ctx;
chops.native.close = tcp_channel_server_close;
ctx->channel = channel_create_stream(0, CHANNEL_FLAG_SYNCHRONOUS, &chops);
if (!ctx->channel)
{
BREAK_WITH_ERROR("[TCP-SERVER] request_net_tcp_server_channel_open. channel_create_stream failed", ERROR_INVALID_HANDLE);
}
scheduler_insert_waitable(ctx->notify, ctx, NULL, (WaitableNotifyRoutine)tcp_channel_server_notify, NULL);
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID, channel_get_id(ctx->channel));
dprintf("[TCP-SERVER] request_net_tcp_server_channel_open. tcp server %s:%d on channel %d", lhost, lport, channel_get_id(ctx->channel));
} while (0);
packet_transmit_response(dwResult, remote, response);
do
{
if (dwResult == ERROR_SUCCESS)
{
break;
}
dprintf("[TCP-SERVER] Error encountered %u 0x%x", dwResult, dwResult);
if (!ctx)
{
break;
}
if (ctx->fd)
{
dprintf("[TCP-SERVER] Destroying socket");
closesocket(ctx->fd);
}
if (ctx->channel)
{
dprintf("[TCP-SERVER] Destroying channel");
channel_destroy(ctx->channel, packet);
}
free(ctx);
} while (0);
return dwResult;
}
