Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

base/applications/mstsc/tcp.c

@@ -0,0 +1,926 @@
+/* -*- c-basic-offset: 8 -*-
+   rdesktop: A Remote Desktop Protocol client.
+   Protocol services - TCP layer
+   Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
+   Copyright 2005-2011 Peter Astrand <astrand@cendio.se> for Cendio AB
+   Copyright 2012-2013 Henrik Andersson <hean01@cendio.se> for Cendio AB
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "precomp.h"
+#ifdef WITH_SSL
+#include <sspi.h>
+#include <schannel.h>
+#endif
+
+#ifdef _WIN32
+#define socklen_t int
+#define TCP_CLOSE(_sck) closesocket(_sck)
+#define TCP_STRERROR "tcp error"
+#define TCP_SLEEP(_n) Sleep(_n)
+#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK)
+#else /* _WIN32 */
+#define TCP_CLOSE(_sck) close(_sck)
+#define TCP_STRERROR strerror(errno)
+#define TCP_SLEEP(_n) sleep(_n)
+#define TCP_BLOCKS (errno == EWOULDBLOCK)
+#endif /* _WIN32 */
+
+#ifndef INADDR_NONE
+#define INADDR_NONE ((unsigned long) -1)
+#endif
+
+#ifdef WITH_SCARD
+#define STREAM_COUNT 8
+#else
+#define STREAM_COUNT 1
+#endif
+
+#ifdef WITH_SSL
+typedef struct
+{
+	CtxtHandle ssl_ctx;
+	SecPkgContext_StreamSizes ssl_sizes;
+	char *ssl_buf;
+	char *extra_buf;
+	size_t extra_len;
+	char *peek_msg;
+	char *peek_msg_mem;
+	size_t peek_len;
+	DWORD security_flags;
+} netconn_t;
+static char * g_ssl_server = NULL;
+static RD_BOOL g_ssl_initialized = False;
+static RD_BOOL cred_handle_initialized = False;
+static RD_BOOL have_compat_cred_handle = False;
+static SecHandle cred_handle, compat_cred_handle;
+static netconn_t g_ssl1;
+static netconn_t *g_ssl = NULL;
+#endif /* WITH_SSL */
+static int g_sock;
+static struct stream g_in;
+static struct stream g_out[STREAM_COUNT];
+int g_tcp_port_rdp = TCP_PORT_RDP;
+extern RD_BOOL g_user_quit;
+extern RD_BOOL g_network_error;
+extern RD_BOOL g_reconnect_loop;
+
+/* Initialise TCP transport data packet */
+STREAM
+tcp_init(uint32 maxlen)
+{
+	static int cur_stream_id = 0;
+	STREAM result = NULL;
+
+#ifdef WITH_SCARD
+	scard_lock(SCARD_LOCK_TCP);
+#endif
+	result = &g_out[cur_stream_id];
+	cur_stream_id = (cur_stream_id + 1) % STREAM_COUNT;
+
+	if (maxlen > result->size)
+	{
+		result->data = (uint8 *) xrealloc(result->data, maxlen);
+		result->size = maxlen;
+	}
+
+	result->p = result->data;
+	result->end = result->data + result->size;
+#ifdef WITH_SCARD
+	scard_unlock(SCARD_LOCK_TCP);
+#endif
+	return result;
+}
+
+#ifdef WITH_SSL
+
+RD_BOOL send_ssl_chunk(const void *msg, size_t size)
+{
+	SecBuffer bufs[4] = {
+		{g_ssl->ssl_sizes.cbHeader, SECBUFFER_STREAM_HEADER, g_ssl->ssl_buf},
+		{size,  SECBUFFER_DATA, g_ssl->ssl_buf+g_ssl->ssl_sizes.cbHeader},
+		{g_ssl->ssl_sizes.cbTrailer, SECBUFFER_STREAM_TRAILER, g_ssl->ssl_buf+g_ssl->ssl_sizes.cbHeader+size},
+		{0, SECBUFFER_EMPTY, NULL}
+	};
+	SecBufferDesc buf_desc = {SECBUFFER_VERSION, sizeof(bufs)/sizeof(*bufs), bufs};
+	SECURITY_STATUS res;
+	int tcp_res;
+
+	memcpy(bufs[1].pvBuffer, msg, size);
+	res = EncryptMessage(&g_ssl->ssl_ctx, 0, &buf_desc, 0);
+	if (res != SEC_E_OK)
+	{
+		error("EncryptMessage failed: %d\n", res);
+		return False;
+	}
+
+	tcp_res = send(g_sock, g_ssl->ssl_buf, bufs[0].cbBuffer+bufs[1].cbBuffer+bufs[2].cbBuffer, 0);
+	if (tcp_res < 1)
+	{
+		error("send failed: %d (%s)\n", tcp_res, TCP_STRERROR);
+		return False;
+	}
+
+	return True;
+}
+
+DWORD read_ssl_chunk(void *buf, SIZE_T buf_size, BOOL blocking, SIZE_T *ret_size, BOOL *eof)
+{
+	const SIZE_T ssl_buf_size = g_ssl->ssl_sizes.cbHeader+g_ssl->ssl_sizes.cbMaximumMessage+g_ssl->ssl_sizes.cbTrailer;
+	SecBuffer bufs[4];
+	SecBufferDesc buf_desc = {SECBUFFER_VERSION, sizeof(bufs)/sizeof(*bufs), bufs};
+	SSIZE_T size, buf_len = 0;
+	int i;
+	SECURITY_STATUS res;
+
+	//assert(conn->extra_len < ssl_buf_size);
+
+	if (g_ssl->extra_len)
+	{
+		memcpy(g_ssl->ssl_buf, g_ssl->extra_buf, g_ssl->extra_len);
+		buf_len = g_ssl->extra_len;
+		g_ssl->extra_len = 0;
+		xfree(g_ssl->extra_buf);
+		g_ssl->extra_buf = NULL;
+	}
+
+	size = recv(g_sock, g_ssl->ssl_buf+buf_len, ssl_buf_size-buf_len, 0);
+	if (size < 0)
+	{
+		if (!buf_len)
+		{
+			if (size == -1 && TCP_BLOCKS)
+			{
+				return WSAEWOULDBLOCK;
+			}
+			error("recv failed: %d (%s)\n", size, TCP_STRERROR);
+			return -1;//ERROR_INTERNET_CONNECTION_ABORTED;
+		}
+	}
+	else
+	{
+		buf_len += size;
+	}
+
+	if (!buf_len)
+	{
+		*eof = TRUE;
+		*ret_size = 0;
+		return ERROR_SUCCESS;
+	}
+
+	*eof = FALSE;
+
+	do
+	{
+		memset(bufs, 0, sizeof(bufs));
+		bufs[0].BufferType = SECBUFFER_DATA;
+		bufs[0].cbBuffer = buf_len;
+		bufs[0].pvBuffer = g_ssl->ssl_buf;
+
+		res = DecryptMessage(&g_ssl->ssl_ctx, &buf_desc, 0, NULL);
+		switch (res)
+		{
+		case SEC_E_OK:
+			break;
+		case SEC_I_CONTEXT_EXPIRED:
+			*eof = TRUE;
+			return ERROR_SUCCESS;
+		case SEC_E_INCOMPLETE_MESSAGE:
+			//assert(buf_len < ssl_buf_size);
+
+			size = recv(g_sock, g_ssl->ssl_buf+buf_len, ssl_buf_size-buf_len, 0);
+			if (size < 1)
+			{
+				if (size == -1 && TCP_BLOCKS)
+				{
+					/* FIXME: Optimize extra_buf usage. */
+					g_ssl->extra_buf = xmalloc(buf_len);
+					if (!g_ssl->extra_buf)
+						return ERROR_NOT_ENOUGH_MEMORY;
+
+					g_ssl->extra_len = buf_len;
+					memcpy(g_ssl->extra_buf, g_ssl->ssl_buf, g_ssl->extra_len);
+					return WSAEWOULDBLOCK;
+				}
+
+				error("recv failed: %d (%s)\n", size, TCP_STRERROR);
+				return -1;//ERROR_INTERNET_CONNECTION_ABORTED;
+			}
+
+			buf_len += size;
+			continue;
+		default:
+			error("DecryptMessage failed: %d\n", res);
+			return -1;//ERROR_INTERNET_CONNECTION_ABORTED;
+		}
+	}
+	while (res != SEC_E_OK);
+
+	for (i=0; i < sizeof(bufs)/sizeof(*bufs); i++)
+	{
+		if (bufs[i].BufferType == SECBUFFER_DATA)
+		{
+			size = min(buf_size, bufs[i].cbBuffer);
+			memcpy(buf, bufs[i].pvBuffer, size);
+			if (size < bufs[i].cbBuffer)
+			{
+				//assert(!conn->peek_len);
+				g_ssl->peek_msg_mem = g_ssl->peek_msg = xmalloc(bufs[i].cbBuffer - size);
+				if (!g_ssl->peek_msg)
+					return ERROR_NOT_ENOUGH_MEMORY;
+				g_ssl->peek_len = bufs[i].cbBuffer-size;
+				memcpy(g_ssl->peek_msg, (char*)bufs[i].pvBuffer+size, g_ssl->peek_len);
+			}
+
+			*ret_size = size;
+		}
+	}
+
+	for (i=0; i < sizeof(bufs)/sizeof(*bufs); i++)
+	{
+		if (bufs[i].BufferType == SECBUFFER_EXTRA)
+		{
+			g_ssl->extra_buf = xmalloc(bufs[i].cbBuffer);
+			if (!g_ssl->extra_buf)
+				return ERROR_NOT_ENOUGH_MEMORY;
+
+			g_ssl->extra_len = bufs[i].cbBuffer;
+			memcpy(g_ssl->extra_buf, bufs[i].pvBuffer, g_ssl->extra_len);
+		}
+	}
+
+	return ERROR_SUCCESS;
+}
+#endif /* WITH_SSL */
+/* Send TCP transport data packet */
+void
+tcp_send(STREAM s)
+{
+	int length = s->end - s->data;
+	int sent, total = 0;
+
+	if (g_network_error == True)
+		return;
+
+#ifdef WITH_SCARD
+	scard_lock(SCARD_LOCK_TCP);
+#endif
+	while (total < length)
+	{
+#ifdef WITH_SSL
+		if (g_ssl)
+		{
+			const BYTE *ptr = s->data + total;
+			size_t chunk_size;
+
+			sent = 0;
+
+			while (length - total)
+			{
+				chunk_size = min(length - total, g_ssl->ssl_sizes.cbMaximumMessage);
+				if (!send_ssl_chunk(ptr, chunk_size))
+				{
+#ifdef WITH_SCARD
+					scard_unlock(SCARD_LOCK_TCP);
+#endif
+
+					//error("send_ssl_chunk: %d (%s)\n", sent, TCP_STRERROR);
+					g_network_error = True;
+					return;
+				}
+
+				sent += chunk_size;
+				ptr += chunk_size;
+				length -= chunk_size;
+			}
+		}
+		else
+		{
+#endif /* WITH_SSL */
+			sent = send(g_sock, (const char *)s->data + total, length - total, 0);
+			if (sent <= 0)
+			{
+				if (sent == -1 && TCP_BLOCKS)
+				{
+					TCP_SLEEP(0);
+					sent = 0;
+				}
+				else
+				{
+#ifdef WITH_SCARD
+					scard_unlock(SCARD_LOCK_TCP);
+#endif
+
+					error("send: %d (%s)\n", sent, TCP_STRERROR);
+					g_network_error = True;
+					return;
+				}
+			}
+#ifdef WITH_SSL
+		}
+#endif /* WITH_SSL */
+		total += sent;
+	}
+#ifdef WITH_SCARD
+	scard_unlock(SCARD_LOCK_TCP);
+#endif
+}
+
+/* Receive a message on the TCP layer */
+STREAM
+tcp_recv(STREAM s, uint32 length)
+{
+	uint32 new_length, end_offset, p_offset;
+	int rcvd = 0;
+
+	if (g_network_error == True)
+		return NULL;
+
+	if (s == NULL)
+	{
+		/* read into "new" stream */
+		if (length > g_in.size)
+		{
+			g_in.data = (uint8 *) xrealloc(g_in.data, length);
+			g_in.size = length;
+		}
+		g_in.end = g_in.p = g_in.data;
+		s = &g_in;
+	}
+	else
+	{
+		/* append to existing stream */
+		new_length = (s->end - s->data) + length;
+		if (new_length > s->size)
+		{
+			p_offset = s->p - s->data;
+			end_offset = s->end - s->data;
+			s->data = (uint8 *) xrealloc(s->data, new_length);
+			s->size = new_length;
+			s->p = s->data + p_offset;
+			s->end = s->data + end_offset;
+		}
+	}
+
+	while (length > 0)
+	{
+#ifdef WITH_SSL
+		if (!g_ssl)
+#endif /* WITH_SSL */
+		{
+			if (!ui_select(g_sock))
+			{
+				/* User quit */
+				g_user_quit = True;
+				return NULL;
+			}
+		}
+
+#ifdef WITH_SSL
+		if (g_ssl)
+		{
+			SIZE_T size = 0;
+			BOOL eof;
+			DWORD res;
+
+			if (g_ssl->peek_msg)
+			{
+				size = min(length, g_ssl->peek_len);
+				memcpy(s->end, g_ssl->peek_msg, size);
+				g_ssl->peek_len -= size;
+				g_ssl->peek_msg += size;
+				s->end += size;
+
+				if (!g_ssl->peek_len)
+				{
+					xfree(g_ssl->peek_msg_mem);
+					g_ssl->peek_msg_mem = g_ssl->peek_msg = NULL;
+				}
+
+				return s;
+			}
+
+			do
+			{
+				res = read_ssl_chunk((BYTE*)s->end, length, TRUE, &size, &eof);
+				if (res != ERROR_SUCCESS)
+				{
+					if (res == WSAEWOULDBLOCK)
+					{
+						if (size)
+						{
+ 							res = ERROR_SUCCESS;
+						}
+					}
+					else
+					{
+						error("read_ssl_chunk: %d (%s)\n", res, TCP_STRERROR);
+						g_network_error = True;
+						return NULL;
+					}
+					break;
+				}
+			}
+			while (!size && !eof);
+			rcvd = size;
+		}
+		else
+		{
+#endif /* WITH_SSL */
+			rcvd = recv(g_sock, (char *)s->end, length, 0);
+			if (rcvd < 0)
+			{
+				if (rcvd == -1 && TCP_BLOCKS)
+				{
+					rcvd = 0;
+				}
+				else
+				{
+					error("recv: %d (%s)\n", rcvd, TCP_STRERROR);
+					g_network_error = True;
+					return NULL;
+				}
+			}
+			else if (rcvd == 0)
+			{
+				error("Connection closed\n");
+				return NULL;
+			}
+#ifdef WITH_SSL
+		}
+#endif /* WITH_SSL */
+
+		s->end += rcvd;
+		length -= rcvd;
+	}
+
+	return s;
+}
+
+#ifdef WITH_SSL
+
+RD_BOOL
+ensure_cred_handle(void)
+{
+	SECURITY_STATUS res = SEC_E_OK;
+
+	if (!cred_handle_initialized)
+	{
+		SCHANNEL_CRED cred = {SCHANNEL_CRED_VERSION};
+		SecPkgCred_SupportedProtocols prots;
+
+		res = AcquireCredentialsHandleW(NULL, (WCHAR*)UNISP_NAME_W, SECPKG_CRED_OUTBOUND, NULL, &cred,
+				NULL, NULL, &cred_handle, NULL);
+		if (res == SEC_E_OK)
+		{
+			res = QueryCredentialsAttributesA(&cred_handle, SECPKG_ATTR_SUPPORTED_PROTOCOLS, &prots);
+			if (res != SEC_E_OK || (prots.grbitProtocol & SP_PROT_TLS1_1PLUS_CLIENT))
+			{
+				cred.grbitEnabledProtocols = prots.grbitProtocol & ~SP_PROT_TLS1_1PLUS_CLIENT;
+				res = AcquireCredentialsHandleW(NULL, (WCHAR*)UNISP_NAME_W, SECPKG_CRED_OUTBOUND, NULL, &cred,
+						NULL, NULL, &compat_cred_handle, NULL);
+				have_compat_cred_handle = res == SEC_E_OK;
+			}
+		}
+
+		cred_handle_initialized = res == SEC_E_OK;
+	}
+
+	if (res != SEC_E_OK)
+	{
+		error("ensure_cred_handle failed: %ld\n", res);
+		return False;
+	}
+
+	return True;
+}
+
+DWORD
+ssl_handshake(RD_BOOL compat_mode)
+{
+	SecBuffer out_buf = {0, SECBUFFER_TOKEN, NULL}, in_bufs[2] = {{0, SECBUFFER_TOKEN}, {0, SECBUFFER_EMPTY}};
+	SecBufferDesc out_desc = {SECBUFFER_VERSION, 1, &out_buf}, in_desc = {SECBUFFER_VERSION, 2, in_bufs};
+	SecHandle *cred = &cred_handle;
+	BYTE *read_buf;
+	SIZE_T read_buf_size = 2048;
+	ULONG attrs = 0;
+	CtxtHandle ctx;
+	SSIZE_T size;
+	SECURITY_STATUS status;
+	DWORD res = ERROR_SUCCESS;
+
+	const DWORD isc_req_flags = ISC_REQ_ALLOCATE_MEMORY|ISC_REQ_USE_SESSION_KEY|ISC_REQ_CONFIDENTIALITY
+		|ISC_REQ_SEQUENCE_DETECT|ISC_REQ_REPLAY_DETECT|ISC_REQ_MANUAL_CRED_VALIDATION;
+
+	if (!ensure_cred_handle())
+		return -1;
+
+	if (compat_mode) {
+		if (!have_compat_cred_handle)
+			return -1;
+		cred = &compat_cred_handle;
+	}
+
+	read_buf = xmalloc(read_buf_size);
+	if (!read_buf)
+		return ERROR_OUTOFMEMORY;
+
+	if (!g_ssl_server)
+		return -1;
+
+	status = InitializeSecurityContextA(cred, NULL, g_ssl_server, isc_req_flags, 0, 0, NULL, 0,
+			&ctx, &out_desc, &attrs, NULL);
+
+	//assert(status != SEC_E_OK);
+
+	while (status == SEC_I_CONTINUE_NEEDED || status == SEC_E_INCOMPLETE_MESSAGE)
+	{
+		if (out_buf.cbBuffer)
+		{
+			//assert(status == SEC_I_CONTINUE_NEEDED);
+
+			size = send(g_sock, out_buf.pvBuffer, out_buf.cbBuffer, 0);
+			if (size != out_buf.cbBuffer)
+			{
+				error("send failed: %d (%s)\n", size, TCP_STRERROR);
+				status = -1;
+				break;
+			}
+
+			FreeContextBuffer(out_buf.pvBuffer);
+			out_buf.pvBuffer = NULL;
+			out_buf.cbBuffer = 0;
+		}
+
+		if (status == SEC_I_CONTINUE_NEEDED)
+		{
+			//assert(in_bufs[1].cbBuffer < read_buf_size);
+
+			memmove(read_buf, (BYTE*)in_bufs[0].pvBuffer+in_bufs[0].cbBuffer-in_bufs[1].cbBuffer, in_bufs[1].cbBuffer);
+			in_bufs[0].cbBuffer = in_bufs[1].cbBuffer;
+
+			in_bufs[1].BufferType = SECBUFFER_EMPTY;
+			in_bufs[1].cbBuffer = 0;
+			in_bufs[1].pvBuffer = NULL;
+		}
+
+		//assert(in_bufs[0].BufferType == SECBUFFER_TOKEN);
+		//assert(in_bufs[1].BufferType == SECBUFFER_EMPTY);
+
+		if (in_bufs[0].cbBuffer + 1024 > read_buf_size)
+		{
+			BYTE *new_read_buf = xrealloc(read_buf, read_buf_size + 1024);
+			if (!new_read_buf)
+			{
+				status = E_OUTOFMEMORY;
+				break;
+			}
+
+			in_bufs[0].pvBuffer = read_buf = new_read_buf;
+			read_buf_size += 1024;
+		}
+
+		size = recv(g_sock, (char *)read_buf + in_bufs[0].cbBuffer, read_buf_size - in_bufs[0].cbBuffer, 0);
+		if (size < 1)
+		{
+			error("recv failed: %d (%s)\n", size, TCP_STRERROR);
+			res = -1;
+			break;
+		}
+
+		in_bufs[0].cbBuffer += size;
+		in_bufs[0].pvBuffer = read_buf;
+		status = InitializeSecurityContextA(cred, &ctx, g_ssl_server,  isc_req_flags, 0, 0, &in_desc,
+				0, NULL, &out_desc, &attrs, NULL);
+
+		if (status == SEC_E_OK) {
+			if (SecIsValidHandle(&g_ssl->ssl_ctx))
+				DeleteSecurityContext(&g_ssl->ssl_ctx);
+			g_ssl->ssl_ctx = ctx;
+
+			if (in_bufs[1].BufferType == SECBUFFER_EXTRA)
+			{
+				//FIXME("SECBUFFER_EXTRA not supported\n");
+			}
+
+			status = QueryContextAttributesW(&ctx, SECPKG_ATTR_STREAM_SIZES, &g_ssl->ssl_sizes);
+			if (status != SEC_E_OK)
+			{
+				//error("Can't determine ssl buffer sizes: %ld\n", status);
+				break;
+			}
+
+			g_ssl->ssl_buf = xmalloc(g_ssl->ssl_sizes.cbHeader + g_ssl->ssl_sizes.cbMaximumMessage
+					+ g_ssl->ssl_sizes.cbTrailer);
+			if (!g_ssl->ssl_buf)
+			{
+				res = GetLastError();
+				break;
+			}
+		}
+	}
+
+	xfree(read_buf);
+
+	if (status != SEC_E_OK || res != ERROR_SUCCESS)
+	{
+		error("Failed to establish SSL connection: %08x (%u)\n", status, res);
+		xfree(g_ssl->ssl_buf);
+		g_ssl->ssl_buf = NULL;
+		return res ? res : -1;
+	}
+
+	return ERROR_SUCCESS;
+}
+
+/* Establish a SSL/TLS 1.0 connection */
+RD_BOOL
+tcp_tls_connect(void)
+{
+	int err;
+	char tcp_port_rdp_s[10];
+
+	if (!g_ssl_initialized)
+	{
+		g_ssl = &g_ssl1;
+		SecInvalidateHandle(&g_ssl->ssl_ctx);
+
+		g_ssl_initialized = True;
+	}
+
+	snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
+	if ((err = ssl_handshake(FALSE)) != 0)
+	{
+		goto fail;
+	}
+
+	return True;
+
+      fail:
+	g_ssl = NULL;
+	return False;
+}
+
+/* Get public key from server of TLS 1.0 connection */
+RD_BOOL
+tcp_tls_get_server_pubkey(STREAM s)
+{
+	const CERT_CONTEXT *cert = NULL;
+	SECURITY_STATUS status;
+
+	s->data = s->p = NULL;
+	s->size = 0;
+
+	if (g_ssl == NULL)
+		goto out;
+	status = QueryContextAttributesW(&g_ssl->ssl_ctx, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (void*)&cert);
+	if (status != SEC_E_OK)
+	{
+		error("tcp_tls_get_server_pubkey: QueryContextAttributesW() failed %ld\n", status);
+		goto out;
+	}
+
+	s->size = cert->cbCertEncoded;
+	if (s->size < 1)
+	{
+		error("tcp_tls_get_server_pubkey: cert->cbCertEncoded = %ld\n", cert->cbCertEncoded);
+		goto out;
+	}
+
+	s->data = s->p = (unsigned char *)xmalloc(s->size);
+	memcpy(cert->pbCertEncoded, &s->p, s->size);
+	s->p = s->data;
+	s->end = s->p + s->size;
+
+      out:
+	if (cert)
+		CertFreeCertificateContext(cert);
+	return (s->size != 0);
+}
+#endif /* WITH_SSL */
+
+/* Establish a connection on the TCP layer */
+RD_BOOL
+tcp_connect(char *server)
+{
+	socklen_t option_len;
+	uint32 option_value;
+	int i;
+
+#ifdef IPv6
+
+	int n;
+	struct addrinfo hints, *res, *ressave;
+	char tcp_port_rdp_s[10];
+
+	snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
+
+	memset(&hints, 0, sizeof(struct addrinfo));
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+
+	if ((n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res)))
+	{
+		error("getaddrinfo: %s\n", gai_strerror(n));
+		return False;
+	}
+
+	ressave = res;
+	g_sock = -1;
+	while (res)
+	{
+		g_sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+		if (!(g_sock < 0))
+		{
+			if (connect(g_sock, res->ai_addr, res->ai_addrlen) == 0)
+				break;
+			TCP_CLOSE(g_sock);
+			g_sock = -1;
+		}
+		res = res->ai_next;
+	}
+	freeaddrinfo(ressave);
+
+	if (g_sock == -1)
+	{
+		error("%s: unable to connect\n", server);
+		return False;
+	}
+
+#else /* no IPv6 support */
+
+	struct hostent *nslookup;
+	struct sockaddr_in servaddr;
+
+	if ((nslookup = gethostbyname(server)) != NULL)
+	{
+		memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
+	}
+	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
+	{
+		error("%s: unable to resolve host\n", server);
+		return False;
+	}
+
+	if ((g_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+	{
+		error("socket: %s\n", TCP_STRERROR);
+		return False;
+	}
+
+	servaddr.sin_family = AF_INET;
+	servaddr.sin_port = htons((uint16) g_tcp_port_rdp);
+
+	if (connect(g_sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
+	{
+		if (!g_reconnect_loop)
+			error("connect: %s\n", TCP_STRERROR);
+
+		TCP_CLOSE(g_sock);
+		g_sock = -1;
+		return False;
+	}
+
+#endif /* IPv6 */
+
+	option_value = 1;
+	option_len = sizeof(option_value);
+	setsockopt(g_sock, IPPROTO_TCP, TCP_NODELAY, (void *) &option_value, option_len);
+	/* receive buffer must be a least 16 K */
+	if (getsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value, &option_len) == 0)
+	{
+		if (option_value < (1024 * 16))
+		{
+			option_value = 1024 * 16;
+			option_len = sizeof(option_value);
+			setsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value,
+				   option_len);
+		}
+	}
+
+	g_in.size = 4096;
+	g_in.data = (uint8 *) xmalloc(g_in.size);
+
+	for (i = 0; i < STREAM_COUNT; i++)
+	{
+		g_out[i].size = 4096;
+		g_out[i].data = (uint8 *) xmalloc(g_out[i].size);
+	}
+
+#ifdef WITH_SSL
+	g_ssl_server = xmalloc(strlen(server)+1);
+#endif /* WITH_SSL */
+
+	return True;
+}
+
+/* Disconnect on the TCP layer */
+void
+tcp_disconnect(void)
+{
+#ifdef WITH_SSL
+	if (g_ssl)
+	{
+		xfree(g_ssl->peek_msg_mem);
+		g_ssl->peek_msg_mem = NULL;
+		g_ssl->peek_msg = NULL;
+		g_ssl->peek_len = 0;
+		xfree(g_ssl->ssl_buf);
+		g_ssl->ssl_buf = NULL;
+		xfree(g_ssl->extra_buf);
+		g_ssl->extra_buf = NULL;
+		g_ssl->extra_len = 0;
+		if (SecIsValidHandle(&g_ssl->ssl_ctx))
+			DeleteSecurityContext(&g_ssl->ssl_ctx);
+		if (cred_handle_initialized)
+			FreeCredentialsHandle(&cred_handle);
+		if (have_compat_cred_handle)
+			FreeCredentialsHandle(&compat_cred_handle);
+		if (g_ssl_server)
+		{
+			xfree(g_ssl_server);
+			g_ssl_server = NULL;
+		}
+		g_ssl = NULL;
+		g_ssl_initialized = False;
+	}
+#endif /* WITH_SSL */
+	TCP_CLOSE(g_sock);
+	g_sock = -1;
+}
+
+char *
+tcp_get_address()
+{
+	static char ipaddr[32];
+	struct sockaddr_in sockaddr;
+	socklen_t len = sizeof(sockaddr);
+	if (getsockname(g_sock, (struct sockaddr *) &sockaddr, &len) == 0)
+	{
+		uint8 *ip = (uint8 *) & sockaddr.sin_addr;
+		sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
+	}
+	else
+		strcpy(ipaddr, "127.0.0.1");
+	return ipaddr;
+}
+
+RD_BOOL
+tcp_is_connected()
+{
+	struct sockaddr_in sockaddr;
+	socklen_t len = sizeof(sockaddr);
+	if (getpeername(g_sock, (struct sockaddr *) &sockaddr, &len))
+		return True;
+	return False;
+}
+
+/* reset the state of the tcp layer */
+/* Support for Session Directory */
+void
+tcp_reset_state(void)
+{
+	int i;
+
+	/* Clear the incoming stream */
+	if (g_in.data != NULL)
+		xfree(g_in.data);
+	g_in.p = NULL;
+	g_in.end = NULL;
+	g_in.data = NULL;
+	g_in.size = 0;
+	g_in.iso_hdr = NULL;
+	g_in.mcs_hdr = NULL;
+	g_in.sec_hdr = NULL;
+	g_in.rdp_hdr = NULL;
+	g_in.channel_hdr = NULL;
+
+	/* Clear the outgoing stream(s) */
+	for (i = 0; i < STREAM_COUNT; i++)
+	{
+		if (g_out[i].data != NULL)
+			xfree(g_out[i].data);
+		g_out[i].p = NULL;
+		g_out[i].end = NULL;
+		g_out[i].data = NULL;
+		g_out[i].size = 0;
+		g_out[i].iso_hdr = NULL;
+		g_out[i].mcs_hdr = NULL;
+		g_out[i].sec_hdr = NULL;
+		g_out[i].rdp_hdr = NULL;
+		g_out[i].channel_hdr = NULL;
+	}
+}