trunk/rdesktop/tcp.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - TCP layer
   Copyright (C) Matthew Chapman 1999-2000
   
   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"

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

/* Initialise TCP transport data packet */
STREAM tcp_init(int maxlen)
{
        if (maxlen > out.size)
        {
                out.data = 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 = write(sock, s->data + total, length - total);

                if (sent <= 0)
                {
                        STATUS("write: %s\n", strerror(errno));
                        return;
                }

                total += sent;
        }
}

/* Receive a message on the TCP layer */
STREAM tcp_recv(int length)
{
        int ret, rcvd = 0;
        struct timeval tv;
        fd_set rfds;

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

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

        while (length > 0)
        {
                ui_process_events();

                FD_ZERO(&rfds);
                FD_SET(sock, &rfds);
                tv.tv_sec = 0;
                tv.tv_usec = 100;

                ret = select(sock + 1, &rfds, NULL, NULL, &tv);

                if (ret)
                {
                        rcvd = read(sock, in.end, length);

                        if (rcvd <= 0)
                        {
                                STATUS("read: %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 = 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)))
        {
                STATUS("%s: unable to resolve host\n", server);
                return False;
        }

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

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

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

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

        return True;
}

/* Disconnect on the TCP layer */
void tcp_disconnect()
{
        close(sock);
}
1	matty	3	/*
2			rdesktop: A Remote Desktop Protocol client.
3			Protocol services - TCP layer
4			Copyright (C) Matthew Chapman 1999-2000
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	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	matty	10	static int sock;
32			static struct stream in;
33			static struct stream out;
34
35			/* Initialise TCP transport data packet */
36			STREAM tcp_init(int maxlen)
37	matty	3	{
38	matty	10	if (maxlen > out.size)
39	matty	3	{
40	matty	10	out.data = xrealloc(out.data, maxlen);
41			out.size = maxlen;
42	matty	3	}
43
44	matty	10	out.p = out.data;
45			out.end = out.data + out.size;
46			return &out;
47	matty	3	}
48
49			/* Send TCP transport data packet */
50	matty	10	void tcp_send(STREAM s)
51	matty	3	{
52	matty	24	int length = s->end - s->data;
53	matty	3	int sent, total = 0;
54
55			while (total < length)
56			{
57	matty	10	sent = write(sock, s->data + total, length - total);
58	matty	3
59			if (sent <= 0)
60			{
61	matty	10	STATUS("write: %s\n", strerror(errno));
62			return;
63	matty	3	}
64
65			total += sent;
66			}
67			}
68
69			/* Receive a message on the TCP layer */
70	matty	10	STREAM tcp_recv(int length)
71	matty	3	{
72	matty	9	int ret, rcvd = 0;
73			struct timeval tv;
74			fd_set rfds;
75	matty	3
76	matty	10	if (length > in.size)
77			{
78			in.data = xrealloc(in.data, length);
79			in.size = length;
80			}
81	matty	3
82	matty	10	in.end = in.p = in.data;
83
84	matty	3	while (length > 0)
85			{
86	matty	10	ui_process_events();
87	matty	3
88	matty	9	FD_ZERO(&rfds);
89	matty	10	FD_SET(sock, &rfds);
90	matty	9	tv.tv_sec = 0;
91			tv.tv_usec = 100;
92
93	matty	24	ret = select(sock + 1, &rfds, NULL, NULL, &tv);
94	matty	9
95			if (ret)
96	matty	3	{
97	matty	10	rcvd = read(sock, in.end, length);
98	matty	9
99			if (rcvd <= 0)
100			{
101	matty	10	STATUS("read: %s\n", strerror(errno));
102			return NULL;
103	matty	9	}
104
105	matty	10	in.end += rcvd;
106	matty	9	length -= rcvd;
107	matty	3	}
108			}
109
110	matty	10	return &in;
111			}
112
113			/* Establish a connection on the TCP layer */
114			BOOL tcp_connect(char *server)
115			{
116			struct hostent *nslookup;
117			struct sockaddr_in servaddr;
118			int true = 1;
119
120			if ((nslookup = gethostbyname(server)) != NULL)
121			{
122	matty	24	memcpy(&servaddr.sin_addr, nslookup->h_addr,
123			sizeof(servaddr.sin_addr));
124	matty	10	}
125	matty	12	else if (!(servaddr.sin_addr.s_addr = inet_addr(server)))
126	matty	10	{
127			STATUS("%s: unable to resolve host\n", server);
128			return False;
129			}
130
131			if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
132			{
133			STATUS("socket: %s\n", strerror(errno));
134			return False;
135			}
136
137			servaddr.sin_family = AF_INET;
138			servaddr.sin_port = htons(TCP_PORT_RDP);
139
140	matty	24	if (connect
141			(sock, (struct sockaddr *) &servaddr,
142			sizeof(struct sockaddr)) < 0)
143	matty	10	{
144			STATUS("connect: %s\n", strerror(errno));
145			close(sock);
146			return False;
147			}
148
149	matty	24	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true,
150			sizeof(true));
151	matty	10
152			in.size = 4096;
153			in.data = xmalloc(in.size);
154
155			out.size = 4096;
156			out.data = xmalloc(out.size);
157
158	matty	3	return True;
159			}
160	matty	10
161			/* Disconnect on the TCP layer */
162			void tcp_disconnect()
163			{
164			close(sock);
165			}