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	matty	3	/*
2			rdesktop: A Remote Desktop Protocol client.
3			Protocol services - TCP layer
4	matthewc	207	Copyright (C) Matthew Chapman 1999-2002
5	matty	3
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	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	matty	24	#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	matty	10	#include "rdesktop.h"
30	matty	3
31	matthewc	306	#ifndef INADDR_NONE
32			#define INADDR_NONE ((unsigned long) -1)
33			#endif
34
35	matty	10	static int sock;
36			static struct stream in;
37			static struct stream out;
38	jsorg71	58	extern int tcp_port_rdp;
39	matty	10
40			/* Initialise TCP transport data packet */
41	matty	25	STREAM
42	jsorg71	376	tcp_init(uint32 maxlen)
43	matty	3	{
44	matty	10	if (maxlen > out.size)
45	matty	3	{
46	jsorg71	376	out.data = (uint8*)xrealloc(out.data, maxlen);
47	matty	10	out.size = maxlen;
48	matty	3	}
49
50	matty	10	out.p = out.data;
51			out.end = out.data + out.size;
52			return &out;
53	matty	3	}
54
55			/* Send TCP transport data packet */
56	matty	25	void
57			tcp_send(STREAM s)
58	matty	3	{
59	matty	24	int length = s->end - s->data;
60	matty	3	int sent, total = 0;
61
62			while (total < length)
63			{
64	matty	33	sent = send(sock, s->data + total, length - total, 0);
65	matty	3	if (sent <= 0)
66			{
67	matty	33	error("send: %s\n", strerror(errno));
68	matty	10	return;
69	matty	3	}
70
71			total += sent;
72			}
73			}
74
75			/* Receive a message on the TCP layer */
76	matty	25	STREAM
77	jsorg71	376	tcp_recv(uint32 length)
78	matty	3	{
79	matty	33	int rcvd = 0;
80	matty	3
81	matty	10	if (length > in.size)
82			{
83	jsorg71	376	in.data = (uint8*)xrealloc(in.data, length);
84	matty	10	in.size = length;
85			}
86	matty	3
87	matty	10	in.end = in.p = in.data;
88
89	matty	3	while (length > 0)
90			{
91	astrand	275	if (!ui_select(sock))
92			/* User quit */
93			return NULL;
94	matty	3
95	matty	33	rcvd = recv(sock, in.end, length, 0);
96			if (rcvd == -1)
97	matty	3	{
98	matty	33	error("recv: %s\n", strerror(errno));
99			return NULL;
100			}
101	matty	9
102	matty	33	in.end += rcvd;
103			length -= rcvd;
104	matty	3	}
105
106	matty	10	return &in;
107			}
108
109			/* Establish a connection on the TCP layer */
110	matty	25	BOOL
111			tcp_connect(char *server)
112	matty	10	{
113			struct hostent *nslookup;
114			struct sockaddr_in servaddr;
115	jsorg71	376	int true_value = 1;
116	matty	10
117			if ((nslookup = gethostbyname(server)) != NULL)
118			{
119	astrand	82	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
120	matty	10	}
121	matthewc	303	else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
122	matty	10	{
123	matty	30	error("%s: unable to resolve host\n", server);
124	matty	10	return False;
125			}
126
127			if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
128			{
129	matty	30	error("socket: %s\n", strerror(errno));
130	matty	10	return False;
131			}
132
133			servaddr.sin_family = AF_INET;
134	jsorg71	58	servaddr.sin_port = htons(tcp_port_rdp);
135	matty	10
136	astrand	82	if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
137	matty	10	{
138	matty	30	error("connect: %s\n", strerror(errno));
139	matty	10	close(sock);
140			return False;
141			}
142
143	jsorg71	376	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
144	matty	10
145			in.size = 4096;
146	jsorg71	376	in.data = (uint8*)xmalloc(in.size);
147	matty	10
148			out.size = 4096;
149	jsorg71	376	out.data = (uint8*)xmalloc(out.size);
150	matty	10
151	matty	3	return True;
152			}
153	matty	10
154			/* Disconnect on the TCP layer */
155	matty	25	void
156	matthewc	192	tcp_disconnect(void)
157	matty	10	{
158			close(sock);
159			}