rdesktop/trunk/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;
int g_tcp_port_rdp = 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;
                }
                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)
{
        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", g_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(g_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);
}

char *
tcp_get_address()
{
        static char ipaddr[32];
        struct sockaddr_in sockaddr;
        size_t len = sizeof(sockaddr);
        if (getsockname(sock, (struct sockaddr *) &sockaddr, &len) == 0)
        {
                unsigned char *ip = (unsigned char *) &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;
}
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	int g_tcp_port_rdp = 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	else if (rcvd == 0)
121	{
122	error("Connection closed\n");
123	return NULL;
124	}
125
126	s->end += rcvd;
127	length -= rcvd;
128	}
129
130	return s;
131	}
132
133	/* Establish a connection on the TCP layer */
134	BOOL
135	tcp_connect(char *server)
136	{
137	int true_value = 1;
138
139	#ifdef IPv6
140
141	int n;
142	struct addrinfo hints, res, ressave;
143	char tcp_port_rdp_s[10];
144
145	snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
146
147	memset(&hints, 0, sizeof(struct addrinfo));
148	hints.ai_family = AF_UNSPEC;
149	hints.ai_socktype = SOCK_STREAM;
150
151	n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res);
152
153	if (n < 0)
154	{
155	error("getaddrinfo: %s\n", gai_strerror(n));
156	return False;
157	}
158
159	ressave = res;
160	sock = -1;
161	while (res)
162	{
163	sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
164	if (!(sock < 0))
165	{
166	if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
167	break;
168	close(sock);
169	sock = -1;
170	}
171	res = res->ai_next;
172	}
173	freeaddrinfo(ressave);
174
175	if (sock == -1)
176	{
177	error("%s: unable to connect\n", server);
178	return False;
179	}
180
181	#else /* no IPv6 support */
182
183	struct hostent *nslookup;
184	struct sockaddr_in servaddr;
185
186	if ((nslookup = gethostbyname(server)) != NULL)
187	{
188	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
189	}
190	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
191	{
192	error("%s: unable to resolve host\n", server);
193	return False;
194	}
195
196	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
197	{
198	error("socket: %s\n", strerror(errno));
199	return False;
200	}
201
202	servaddr.sin_family = AF_INET;
203	servaddr.sin_port = htons(g_tcp_port_rdp);
204
205	if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
206	{
207	error("connect: %s\n", strerror(errno));
208	close(sock);
209	return False;
210	}
211
212	#endif /* IPv6 */
213
214	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
215
216	in.size = 4096;
217	in.data = (uint8 *) xmalloc(in.size);
218
219	out.size = 4096;
220	out.data = (uint8 *) xmalloc(out.size);
221
222	return True;
223	}
224
225	/* Disconnect on the TCP layer */
226	void
227	tcp_disconnect(void)
228	{
229	close(sock);
230	}
231
232	char *
233	tcp_get_address()
234	{
235	static char ipaddr[32];
236	struct sockaddr_in sockaddr;
237	size_t len = sizeof(sockaddr);
238	if (getsockname(sock, (struct sockaddr *) &sockaddr, &len) == 0)
239	{
240	unsigned char ip = (unsigned char ) &sockaddr.sin_addr;
241	sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
242	}
243	else
244	strcpy(ipaddr, "127.0.0.1");
245	return ipaddr;
246	}