trunk/rdesktop/tcp.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - TCP layer
   Copyright (C) Matthew Chapman 1999-2002
   
   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.
*/

#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 */
#include "rdesktop.h"

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

static int sock;
static struct stream in;
static struct stream out;
extern int tcp_port_rdp;

/* Initialise TCP transport data packet */
STREAM
tcp_init(uint32 maxlen)
{
        if (maxlen > out.size)
        {
                out.data = (uint8 *) xrealloc(out.data, maxlen);
                out.size = maxlen;
        }

        out.p = out.data;
        out.end = out.data + out.size;
        return &out;
}

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

        while (total < length)
        {
                sent = send(sock, s->data + total, length - total, 0);
                if (sent <= 0)
                {
                        error("send: %s\n", strerror(errno));
                        return;
                }

                total += sent;
        }
}

/* Receive a message on the TCP layer */
STREAM
tcp_recv(STREAM s, uint32 length)
{
        unsigned int new_length, end_offset, p_offset;
        int rcvd = 0;

        if (s == NULL)
        {
                /* read into "new" stream */
                if (length > in.size)
                {
                        in.data = (uint8 *) xrealloc(in.data, length);
                        in.size = length;
                }
                in.end = in.p = in.data;
                s = &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(sock))
                        /* User quit */
                        return NULL;

                rcvd = recv(sock, s->end, length, 0);
                if (rcvd <= 0)
                {
                        error("recv: %s\n", strerror(errno));
                        return NULL;
                }

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

        return s;
}

/* Establish a connection on the TCP layer */
BOOL
tcp_connect(char *server)
{
        int true_value = 1;

#ifdef IPv6

        int n;
        struct addrinfo hints, *res, *ressave;
        char tcp_port_rdp_s[10];

        snprintf(tcp_port_rdp_s, 10, "%d", tcp_port_rdp);

        memset(&hints, 0, sizeof(struct addrinfo));
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;

        n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res);

        if (n < 0)
        {
                error("getaddrinfo: %s\n", gai_strerror(n));
                return False;
        }

        ressave = res;
        sock = -1;
        while (res)
        {
                sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
                if (!(sock < 0))
                {
                        if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
                                break;
                        close(sock);
                        sock = -1;
                }
                res = res->ai_next;
        }
        freeaddrinfo(ressave);

        if (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 ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
        {
                error("socket: %s\n", strerror(errno));
                return False;
        }

        servaddr.sin_family = AF_INET;
        servaddr.sin_port = htons(tcp_port_rdp);

        if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
        {
                error("connect: %s\n", strerror(errno));
                close(sock);
                return False;
        }

#endif /* IPv6 */

        setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));

        in.size = 4096;
        in.data = (uint8 *) xmalloc(in.size);

        out.size = 4096;
        out.data = (uint8 *) xmalloc(out.size);

        return True;
}

/* Disconnect on the TCP layer */
void
tcp_disconnect(void)
{
        close(sock);
}
1	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Protocol services - TCP layer
4	Copyright (C) Matthew Chapman 1999-2002
5
6	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
11	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
16	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	#include <unistd.h> /* select read write close */
22	#include <sys/socket.h> /* socket connect setsockopt */
23	#include <sys/time.h> /* timeval */
24	#include <netdb.h> /* gethostbyname */
25	#include <netinet/in.h> /* sockaddr_in */
26	#include <netinet/tcp.h> /* TCP_NODELAY */
27	#include <arpa/inet.h> /* inet_addr */
28	#include <errno.h> /* errno */
29	#include "rdesktop.h"
30
31	#ifndef INADDR_NONE
32	#define INADDR_NONE ((unsigned long) -1)
33	#endif
34
35	static int sock;
36	static struct stream in;
37	static struct stream out;
38	extern int tcp_port_rdp;
39
40	/* Initialise TCP transport data packet */
41	STREAM
42	tcp_init(uint32 maxlen)
43	{
44	if (maxlen > out.size)
45	{
46	out.data = (uint8 *) xrealloc(out.data, maxlen);
47	out.size = maxlen;
48	}
49
50	out.p = out.data;
51	out.end = out.data + out.size;
52	return &out;
53	}
54
55	/* Send TCP transport data packet */
56	void
57	tcp_send(STREAM s)
58	{
59	int length = s->end - s->data;
60	int sent, total = 0;
61
62	while (total < length)
63	{
64	sent = send(sock, s->data + total, length - total, 0);
65	if (sent <= 0)
66	{
67	error("send: %s\n", strerror(errno));
68	return;
69	}
70
71	total += sent;
72	}
73	}
74
75	/* Receive a message on the TCP layer */
76	STREAM
77	tcp_recv(STREAM s, uint32 length)
78	{
79	unsigned int new_length, end_offset, p_offset;
80	int rcvd = 0;
81
82	if (s == NULL)
83	{
84	/* read into "new" stream */
85	if (length > in.size)
86	{
87	in.data = (uint8 *) xrealloc(in.data, length);
88	in.size = length;
89	}
90	in.end = in.p = in.data;
91	s = &in;
92	}
93	else
94	{
95	/* append to existing stream */
96	new_length = (s->end - s->data) + length;
97	if (new_length > s->size)
98	{
99	p_offset = s->p - s->data;
100	end_offset = s->end - s->data;
101	s->data = (uint8 *) xrealloc(s->data, new_length);
102	s->size = new_length;
103	s->p = s->data + p_offset;
104	s->end = s->data + end_offset;
105	}
106	}
107
108	while (length > 0)
109	{
110	if (!ui_select(sock))
111	/* User quit */
112	return NULL;
113
114	rcvd = recv(sock, s->end, length, 0);
115	if (rcvd <= 0)
116	{
117	error("recv: %s\n", strerror(errno));
118	return NULL;
119	}
120
121	s->end += rcvd;
122	length -= rcvd;
123	}
124
125	return s;
126	}
127
128	/* Establish a connection on the TCP layer */
129	BOOL
130	tcp_connect(char *server)
131	{
132	int true_value = 1;
133
134	#ifdef IPv6
135
136	int n;
137	struct addrinfo hints, res, ressave;
138	char tcp_port_rdp_s[10];
139
140	snprintf(tcp_port_rdp_s, 10, "%d", tcp_port_rdp);
141
142	memset(&hints, 0, sizeof(struct addrinfo));
143	hints.ai_family = AF_UNSPEC;
144	hints.ai_socktype = SOCK_STREAM;
145
146	n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res);
147
148	if (n < 0)
149	{
150	error("getaddrinfo: %s\n", gai_strerror(n));
151	return False;
152	}
153
154	ressave = res;
155	sock = -1;
156	while (res)
157	{
158	sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
159	if (!(sock < 0))
160	{
161	if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
162	break;
163	close(sock);
164	sock = -1;
165	}
166	res = res->ai_next;
167	}
168	freeaddrinfo(ressave);
169
170	if (sock == -1)
171	{
172	error("%s: unable to connect\n", server);
173	return False;
174	}
175
176	#else /* no IPv6 support */
177
178	struct hostent *nslookup;
179	struct sockaddr_in servaddr;
180
181	if ((nslookup = gethostbyname(server)) != NULL)
182	{
183	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
184	}
185	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
186	{
187	error("%s: unable to resolve host\n", server);
188	return False;
189	}
190
191	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
192	{
193	error("socket: %s\n", strerror(errno));
194	return False;
195	}
196
197	servaddr.sin_family = AF_INET;
198	servaddr.sin_port = htons(tcp_port_rdp);
199
200	if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
201	{
202	error("connect: %s\n", strerror(errno));
203	close(sock);
204	return False;
205	}
206
207	#endif /* IPv6 */
208
209	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
210
211	in.size = 4096;
212	in.data = (uint8 *) xmalloc(in.size);
213
214	out.size = 4096;
215	out.data = (uint8 *) xmalloc(out.size);
216
217	return True;
218	}
219
220	/* Disconnect on the TCP layer */
221	void
222	tcp_disconnect(void)
223	{
224	close(sock);
225	}