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(uint32 length)
{
        int rcvd = 0;

        if (length > in.size)
        {
                in.data = (uint8 *) xrealloc(in.data, length);
                in.size = length;
        }

        in.end = in.p = in.data;

        while (length > 0)
        {
                if (!ui_select(sock))
                        /* User quit */
                        return NULL;

                rcvd = recv(sock, in.end, length, 0);
                if (rcvd == -1)
                {
                        error("recv: %s\n", strerror(errno));
                        return NULL;
                }

                in.end += rcvd;
                length -= rcvd;
        }

        return &in;
}

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

        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;
        }

        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(uint32 length)
78	{
79	int rcvd = 0;
80
81	if (length > in.size)
82	{
83	in.data = (uint8 *) xrealloc(in.data, length);
84	in.size = length;
85	}
86
87	in.end = in.p = in.data;
88
89	while (length > 0)
90	{
91	if (!ui_select(sock))
92	/* User quit */
93	return NULL;
94
95	rcvd = recv(sock, in.end, length, 0);
96	if (rcvd == -1)
97	{
98	error("recv: %s\n", strerror(errno));
99	return NULL;
100	}
101
102	in.end += rcvd;
103	length -= rcvd;
104	}
105
106	return &in;
107	}
108
109	/* Establish a connection on the TCP layer */
110	BOOL
111	tcp_connect(char *server)
112	{
113	struct hostent *nslookup;
114	struct sockaddr_in servaddr;
115	int true_value = 1;
116
117	if ((nslookup = gethostbyname(server)) != NULL)
118	{
119	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
120	}
121	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
122	{
123	error("%s: unable to resolve host\n", server);
124	return False;
125	}
126
127	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
128	{
129	error("socket: %s\n", strerror(errno));
130	return False;
131	}
132
133	servaddr.sin_family = AF_INET;
134	servaddr.sin_port = htons(tcp_port_rdp);
135
136	if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
137	{
138	error("connect: %s\n", strerror(errno));
139	close(sock);
140	return False;
141	}
142
143	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
144
145	in.size = 4096;
146	in.data = (uint8 *) xmalloc(in.size);
147
148	out.size = 4096;
149	out.data = (uint8 *) xmalloc(out.size);
150
151	return True;
152	}
153
154	/* Disconnect on the TCP layer */
155	void
156	tcp_disconnect(void)
157	{
158	close(sock);
159	}