trunk/rdesktop/tcp.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - TCP layer
   Copyright (C) Matthew Chapman 1999-2001
   
   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)
                {
                        error("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)
                        {
                                error("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)))
        {
                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,
                   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	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Protocol services - TCP layer
4	Copyright (C) Matthew Chapman 1999-2001
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	static int sock;
32	static struct stream in;
33	static struct stream out;
34
35	/* Initialise TCP transport data packet */
36	STREAM
37	tcp_init(int maxlen)
38	{
39	if (maxlen > out.size)
40	{
41	out.data = xrealloc(out.data, maxlen);
42	out.size = maxlen;
43	}
44
45	out.p = out.data;
46	out.end = out.data + out.size;
47	return &out;
48	}
49
50	/* Send TCP transport data packet */
51	void
52	tcp_send(STREAM s)
53	{
54	int length = s->end - s->data;
55	int sent, total = 0;
56
57	while (total < length)
58	{
59	sent = write(sock, s->data + total, length - total);
60
61	if (sent <= 0)
62	{
63	error("write: %s\n", strerror(errno));
64	return;
65	}
66
67	total += sent;
68	}
69	}
70
71	/* Receive a message on the TCP layer */
72	STREAM
73	tcp_recv(int length)
74	{
75	int ret, rcvd = 0;
76	struct timeval tv;
77	fd_set rfds;
78
79	if (length > in.size)
80	{
81	in.data = xrealloc(in.data, length);
82	in.size = length;
83	}
84
85	in.end = in.p = in.data;
86
87	while (length > 0)
88	{
89	ui_process_events();
90
91	FD_ZERO(&rfds);
92	FD_SET(sock, &rfds);
93	tv.tv_sec = 0;
94	tv.tv_usec = 100;
95
96	ret = select(sock + 1, &rfds, NULL, NULL, &tv);
97
98	if (ret)
99	{
100	rcvd = read(sock, in.end, length);
101
102	if (rcvd <= 0)
103	{
104	error("read: %s\n", strerror(errno));
105	return NULL;
106	}
107
108	in.end += rcvd;
109	length -= rcvd;
110	}
111	}
112
113	return &in;
114	}
115
116	/* Establish a connection on the TCP layer */
117	BOOL
118	tcp_connect(char *server)
119	{
120	struct hostent *nslookup;
121	struct sockaddr_in servaddr;
122	int true = 1;
123
124	if ((nslookup = gethostbyname(server)) != NULL)
125	{
126	memcpy(&servaddr.sin_addr, nslookup->h_addr,
127	sizeof(servaddr.sin_addr));
128	}
129	else if (!(servaddr.sin_addr.s_addr = inet_addr(server)))
130	{
131	error("%s: unable to resolve host\n", server);
132	return False;
133	}
134
135	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
136	{
137	error("socket: %s\n", strerror(errno));
138	return False;
139	}
140
141	servaddr.sin_family = AF_INET;
142	servaddr.sin_port = htons(TCP_PORT_RDP);
143
144	if (connect
145	(sock, (struct sockaddr *) &servaddr,
146	sizeof(struct sockaddr)) < 0)
147	{
148	error("connect: %s\n", strerror(errno));
149	close(sock);
150	return False;
151	}
152
153	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true,
154	sizeof(true));
155
156	in.size = 4096;
157	in.data = xmalloc(in.size);
158
159	out.size = 4096;
160	out.data = xmalloc(out.size);
161
162	return True;
163	}
164
165	/* Disconnect on the TCP layer */
166	void
167	tcp_disconnect()
168	{
169	close(sock);
170	}