rdesktop/trunk/tcp.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - TCP layer
   Copyright (C) Matthew Chapman 1999-2005

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef _WIN32
#include <unistd.h>             /* select read write close */
#include <sys/socket.h>         /* socket connect setsockopt */
#include <sys/time.h>           /* timeval */
#include <netdb.h>              /* gethostbyname */
#include <netinet/in.h>         /* sockaddr_in */
#include <netinet/tcp.h>        /* TCP_NODELAY */
#include <arpa/inet.h>          /* inet_addr */
#include <errno.h>              /* errno */
#endif

#include "rdesktop.h"

#ifdef _WIN32
#define socklen_t int
#define TCP_CLOSE(_sck) closesocket(_sck)
#define TCP_STRERROR "tcp error"
#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK)
#else
#define TCP_CLOSE(_sck) close(_sck)
#define TCP_STRERROR strerror(errno)
#define TCP_BLOCKS (errno == EWOULDBLOCK)
#endif

#ifndef INADDR_NONE
#define INADDR_NONE ((unsigned long) -1)
#endif

static int g_sock;
static struct stream g_in;
#ifndef WITH_SCARD
static struct stream g_out;
#endif
int g_tcp_port_rdp = TCP_PORT_RDP;

/* wait till socket is ready to write or timeout */
static BOOL
tcp_can_send(int sck, int millis)
{
        fd_set wfds;
        struct timeval time;
        int sel_count;

        time.tv_sec = millis / 1000;
        time.tv_usec = (millis * 1000) % 1000000;
        FD_ZERO(&wfds);
        FD_SET(sck, &wfds);
        sel_count = select(sck + 1, 0, &wfds, 0, &time);
        if (sel_count > 0)
        {
                return True;
        }
        return False;
}

/* Initialise TCP transport data packet */
STREAM
tcp_init(uint32 maxlen)
{
        STREAM result = NULL;

#ifdef WITH_SCARD
        scard_lock(SCARD_LOCK_TCP);
        result = scard_tcp_init();
#else
        result = &g_out;
#endif

        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;
}

/* Send TCP transport data packet */
void
tcp_send(STREAM s)
{
        int length = s->end - s->data;
        int sent, total = 0;

#ifdef WITH_SCARD
        scard_lock(SCARD_LOCK_TCP);
#endif
        while (total < length)
        {
                sent = send(g_sock, s->data + total, length - total, 0);
                if (sent <= 0)
                {
                        if (sent == -1 && TCP_BLOCKS)
                        {
                                tcp_can_send(g_sock, 100);
                                sent = 0;
                        }
                        else
                        {
                                error("send: %s\n", TCP_STRERROR);
                                return;
                        }
                }
                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 (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)
        {
                if (!ui_select(g_sock))
                        /* User quit */
                        return NULL;

                rcvd = recv(g_sock, s->end, length, 0);
                if (rcvd < 0)
                {
                        if (rcvd == -1 && TCP_BLOCKS)
                        {
                                rcvd = 0;
                        }
                        else
                        {
                                error("recv: %s\n", TCP_STRERROR);
                                return NULL;
                        }
                }
                else if (rcvd == 0)
                {
                        error("Connection closed\n");
                        return NULL;
                }

                s->end += rcvd;
                length -= rcvd;
        }

        return s;
}

/* Establish a connection on the TCP layer */
BOOL
tcp_connect(char *server)
{
        socklen_t option_len;
        uint32 option_value;

#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)
        {
                error("connect: %s\n", TCP_STRERROR);
                TCP_CLOSE(g_sock);
                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);

#ifdef WITH_SCARD
        scard_tcp_connect();
#else
        g_out.size = 4096;
        g_out.data = (uint8 *) xmalloc(g_out.size);
#endif

        return True;
}

/* Disconnect on the TCP layer */
void
tcp_disconnect(void)
{
        TCP_CLOSE(g_sock);
}

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;
}

/* reset the state of the tcp layer */
/* Support for Session Directory */
void
tcp_reset_state(void)
{
        g_sock = -1;            /* reset socket */

        /* 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) */
#ifdef WITH_SCARD
        scard_tcp_reset_state();
#else
        if (g_out.data != NULL)
                xfree(g_out.data);
        g_out.p = NULL;
        g_out.end = NULL;
        g_out.data = NULL;
        g_out.size = 0;
        g_out.iso_hdr = NULL;
        g_out.mcs_hdr = NULL;
        g_out.sec_hdr = NULL;
        g_out.rdp_hdr = NULL;
        g_out.channel_hdr = NULL;
#endif
}
1	astrand	963	/* -- c-basic-offset: 8 --
2	matty	3	rdesktop: A Remote Desktop Protocol client.
3			Protocol services - TCP layer
4	stargo	828	Copyright (C) Matthew Chapman 1999-2005
5	jsorg71	1349
6	matty	3	This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10	jsorg71	1349
11	matty	3	This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15	jsorg71	376
16	matty	3	You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19			*/
20
21	jsorg71	1349	#ifndef _WIN32
22	matty	24	#include <unistd.h> /* select read write close */
23			#include <sys/socket.h> /* socket connect setsockopt */
24			#include <sys/time.h> /* timeval */
25			#include <netdb.h> /* gethostbyname */
26			#include <netinet/in.h> /* sockaddr_in */
27			#include <netinet/tcp.h> /* TCP_NODELAY */
28			#include <arpa/inet.h> /* inet_addr */
29			#include <errno.h> /* errno */
30	jsorg71	1349	#endif
31
32	matty	10	#include "rdesktop.h"
33	matty	3
34	jsorg71	1349	#ifdef _WIN32
35			#define socklen_t int
36			#define TCP_CLOSE(_sck) closesocket(_sck)
37			#define TCP_STRERROR "tcp error"
38			#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK)
39			#else
40			#define TCP_CLOSE(_sck) close(_sck)
41			#define TCP_STRERROR strerror(errno)
42			#define TCP_BLOCKS (errno == EWOULDBLOCK)
43			#endif
44
45	matthewc	306	#ifndef INADDR_NONE
46			#define INADDR_NONE ((unsigned long) -1)
47			#endif
48
49	jsorg71	1349	static int g_sock;
50			static struct stream g_in;
51	stargo	1309	#ifndef WITH_SCARD
52	jsorg71	1349	static struct stream g_out;
53	stargo	1309	#endif
54	jsorg71	710	int g_tcp_port_rdp = TCP_PORT_RDP;
55	matty	10
56	jsorg71	1349	/* wait till socket is ready to write or timeout */
57			static BOOL
58			tcp_can_send(int sck, int millis)
59			{
60			fd_set wfds;
61			struct timeval time;
62			int sel_count;
63
64			time.tv_sec = millis / 1000;
65			time.tv_usec = (millis * 1000) % 1000000;
66			FD_ZERO(&wfds);
67			FD_SET(sck, &wfds);
68			sel_count = select(sck + 1, 0, &wfds, 0, &time);
69			if (sel_count > 0)
70			{
71			return True;
72			}
73			return False;
74			}
75
76	matty	10	/* Initialise TCP transport data packet */
77	matty	25	STREAM
78	jsorg71	376	tcp_init(uint32 maxlen)
79	matty	3	{
80	stargo	1309	STREAM result = NULL;
81
82			#ifdef WITH_SCARD
83	stargo	1328	scard_lock(SCARD_LOCK_TCP);
84	stargo	1309	result = scard_tcp_init();
85			#else
86	jsorg71	1349	result = &g_out;
87	stargo	1309	#endif
88
89			if (maxlen > result->size)
90	matty	3	{
91	stargo	1309	result->data = (uint8 *) xrealloc(result->data, maxlen);
92			result->size = maxlen;
93	matty	3	}
94
95	stargo	1309	result->p = result->data;
96			result->end = result->data + result->size;
97			#ifdef WITH_SCARD
98	stargo	1328	scard_unlock(SCARD_LOCK_TCP);
99	stargo	1309	#endif
100			return result;
101	matty	3	}
102
103			/* Send TCP transport data packet */
104	matty	25	void
105			tcp_send(STREAM s)
106	matty	3	{
107	matty	24	int length = s->end - s->data;
108	matty	3	int sent, total = 0;
109
110	stargo	1309	#ifdef WITH_SCARD
111	stargo	1328	scard_lock(SCARD_LOCK_TCP);
112	stargo	1309	#endif
113	matty	3	while (total < length)
114			{
115	jsorg71	1349	sent = send(g_sock, s->data + total, length - total, 0);
116	matty	3	if (sent <= 0)
117			{
118	jsorg71	1349	if (sent == -1 && TCP_BLOCKS)
119			{
120			tcp_can_send(g_sock, 100);
121			sent = 0;
122			}
123			else
124			{
125			error("send: %s\n", TCP_STRERROR);
126			return;
127			}
128	matty	3	}
129			total += sent;
130			}
131	stargo	1309	#ifdef WITH_SCARD
132	stargo	1328	scard_unlock(SCARD_LOCK_TCP);
133	stargo	1309	#endif
134	matty	3	}
135
136			/* Receive a message on the TCP layer */
137	matty	25	STREAM
138	matthewc	423	tcp_recv(STREAM s, uint32 length)
139	matty	3	{
140	jsorg71	1349	uint32 new_length, end_offset, p_offset;
141	matty	33	int rcvd = 0;
142	matty	3
143	matthewc	423	if (s == NULL)
144	matty	10	{
145	matthewc	423	/* read into "new" stream */
146	jsorg71	1349	if (length > g_in.size)
147	matthewc	423	{
148	jsorg71	1349	g_in.data = (uint8 *) xrealloc(g_in.data, length);
149			g_in.size = length;
150	matthewc	423	}
151	jsorg71	1349	g_in.end = g_in.p = g_in.data;
152			s = &g_in;
153	matty	10	}
154	matthewc	423	else
155			{
156			/* append to existing stream */
157			new_length = (s->end - s->data) + length;
158			if (new_length > s->size)
159			{
160			p_offset = s->p - s->data;
161			end_offset = s->end - s->data;
162			s->data = (uint8 *) xrealloc(s->data, new_length);
163			s->size = new_length;
164			s->p = s->data + p_offset;
165			s->end = s->data + end_offset;
166			}
167			}
168	matty	3
169			while (length > 0)
170			{
171	jsorg71	1349	if (!ui_select(g_sock))
172	astrand	275	/* User quit */
173			return NULL;
174	matty	3
175	jsorg71	1349	rcvd = recv(g_sock, s->end, length, 0);
176	astrand	546	if (rcvd < 0)
177	matty	3	{
178	jsorg71	1349	if (rcvd == -1 && TCP_BLOCKS)
179			{
180			rcvd = 0;
181			}
182			else
183			{
184			error("recv: %s\n", TCP_STRERROR);
185			return NULL;
186			}
187	matty	33	}
188	astrand	546	else if (rcvd == 0)
189			{
190			error("Connection closed\n");
191			return NULL;
192			}
193	matty	9
194	matthewc	423	s->end += rcvd;
195	matty	33	length -= rcvd;
196	matty	3	}
197
198	matthewc	423	return s;
199	matty	10	}
200
201			/* Establish a connection on the TCP layer */
202	matty	25	BOOL
203			tcp_connect(char *server)
204	matty	10	{
205	jsorg71	1349	socklen_t option_len;
206			uint32 option_value;
207	astrand	440
208			#ifdef IPv6
209
210			int n;
211			struct addrinfo hints, res, ressave;
212			char tcp_port_rdp_s[10];
213
214	jsorg71	710	snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
215	astrand	440
216			memset(&hints, 0, sizeof(struct addrinfo));
217			hints.ai_family = AF_UNSPEC;
218			hints.ai_socktype = SOCK_STREAM;
219
220	stargo	728	if ((n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res)))
221	astrand	440	{
222	astrand	443	error("getaddrinfo: %s\n", gai_strerror(n));
223	astrand	440	return False;
224			}
225
226			ressave = res;
227	jsorg71	1349	g_sock = -1;
228	astrand	440	while (res)
229			{
230	jsorg71	1349	g_sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
231			if (!(g_sock < 0))
232	astrand	440	{
233	jsorg71	1349	if (connect(g_sock, res->ai_addr, res->ai_addrlen) == 0)
234	astrand	440	break;
235	jsorg71	1349	TCP_CLOSE(g_sock);
236			g_sock = -1;
237	astrand	440	}
238			res = res->ai_next;
239			}
240			freeaddrinfo(ressave);
241
242	jsorg71	1349	if (g_sock == -1)
243	astrand	443	{
244			error("%s: unable to connect\n", server);
245			return False;
246			}
247
248	astrand	440	#else /* no IPv6 support */
249
250	matty	10	struct hostent *nslookup;
251			struct sockaddr_in servaddr;
252
253			if ((nslookup = gethostbyname(server)) != NULL)
254			{
255	astrand	82	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
256	matty	10	}
257	matthewc	303	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
258	matty	10	{
259	matty	30	error("%s: unable to resolve host\n", server);
260	matty	10	return False;
261			}
262
263	jsorg71	1349	if ((g_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
264	matty	10	{
265	jsorg71	1349	error("socket: %s\n", TCP_STRERROR);
266	matty	10	return False;
267			}
268
269			servaddr.sin_family = AF_INET;
270	jsorg71	1349	servaddr.sin_port = htons((uint16) g_tcp_port_rdp);
271	matty	10
272	jsorg71	1349	if (connect(g_sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
273	matty	10	{
274	jsorg71	1349	error("connect: %s\n", TCP_STRERROR);
275			TCP_CLOSE(g_sock);
276	matty	10	return False;
277			}
278
279	astrand	440	#endif /* IPv6 */
280
281	jsorg71	1349	option_value = 1;
282			option_len = sizeof(option_value);
283			setsockopt(g_sock, IPPROTO_TCP, TCP_NODELAY, (void *) &option_value, option_len);
284			/* receive buffer must be a least 16 K */
285			if (getsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value, &option_len) == 0)
286			{
287			if (option_value < (1024 * 16))
288			{
289			option_value = 1024 * 16;
290			option_len = sizeof(option_value);
291	astrand	1362	setsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value,
292			option_len);
293	jsorg71	1349	}
294			}
295	matty	10
296	jsorg71	1349	g_in.size = 4096;
297			g_in.data = (uint8 *) xmalloc(g_in.size);
298	matty	10
299	stargo	1309	#ifdef WITH_SCARD
300			scard_tcp_connect();
301			#else
302	jsorg71	1349	g_out.size = 4096;
303			g_out.data = (uint8 *) xmalloc(g_out.size);
304	stargo	1309	#endif
305	matty	10
306	matty	3	return True;
307			}
308	matty	10
309			/* Disconnect on the TCP layer */
310	matty	25	void
311	matthewc	192	tcp_disconnect(void)
312	matty	10	{
313	jsorg71	1349	TCP_CLOSE(g_sock);
314	matty	10	}
315	n-ki	625
316			char *
317			tcp_get_address()
318			{
319			static char ipaddr[32];
320			struct sockaddr_in sockaddr;
321	stargo	872	socklen_t len = sizeof(sockaddr);
322	jsorg71	1349	if (getsockname(g_sock, (struct sockaddr *) &sockaddr, &len) == 0)
323	n-ki	625	{
324	astrand	1362	uint8 ip = (uint8 ) & sockaddr.sin_addr;
325	n-ki	625	sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
326			}
327			else
328			strcpy(ipaddr, "127.0.0.1");
329			return ipaddr;
330			}
331	astrand	977
332			/* reset the state of the tcp layer */
333			/* Support for Session Directory */
334			void
335			tcp_reset_state(void)
336			{
337	jsorg71	1349	g_sock = -1; /* reset socket */
338	astrand	977
339			/* Clear the incoming stream */
340	jsorg71	1349	if (g_in.data != NULL)
341			xfree(g_in.data);
342			g_in.p = NULL;
343			g_in.end = NULL;
344			g_in.data = NULL;
345			g_in.size = 0;
346			g_in.iso_hdr = NULL;
347			g_in.mcs_hdr = NULL;
348			g_in.sec_hdr = NULL;
349			g_in.rdp_hdr = NULL;
350			g_in.channel_hdr = NULL;
351	astrand	977
352	stargo	1309	/* Clear the outgoing stream(s) */
353			#ifdef WITH_SCARD
354			scard_tcp_reset_state();
355			#else
356	jsorg71	1349	if (g_out.data != NULL)
357			xfree(g_out.data);
358			g_out.p = NULL;
359			g_out.end = NULL;
360			g_out.data = NULL;
361			g_out.size = 0;
362			g_out.iso_hdr = NULL;
363			g_out.mcs_hdr = NULL;
364			g_out.sec_hdr = NULL;
365			g_out.rdp_hdr = NULL;
366			g_out.channel_hdr = NULL;
367	stargo	1309	#endif
368	astrand	977	}