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	matty	25	STREAM
37			tcp_init(int maxlen)
38	matty	3	{
39	matty	10	if (maxlen > out.size)
40	matty	3	{
41	matty	10	out.data = xrealloc(out.data, maxlen);
42			out.size = maxlen;
43	matty	3	}
44
45	matty	10	out.p = out.data;
46			out.end = out.data + out.size;
47			return &out;
48	matty	3	}
49
50			/* Send TCP transport data packet */
51	matty	25	void
52			tcp_send(STREAM s)
53	matty	3	{
54	matty	24	int length = s->end - s->data;
55	matty	3	int sent, total = 0;
56
57			while (total < length)
58			{
59	matty	10	sent = write(sock, s->data + total, length - total);
60	matty	3
61			if (sent <= 0)
62			{
63	matty	10	STATUS("write: %s\n", strerror(errno));
64			return;
65	matty	3	}
66
67			total += sent;
68			}
69			}
70
71			/* Receive a message on the TCP layer */
72	matty	25	STREAM
73			tcp_recv(int length)
74	matty	3	{
75	matty	9	int ret, rcvd = 0;
76			struct timeval tv;
77			fd_set rfds;
78	matty	3
79	matty	10	if (length > in.size)
80			{
81			in.data = xrealloc(in.data, length);
82			in.size = length;
83			}
84	matty	3
85	matty	10	in.end = in.p = in.data;
86
87	matty	3	while (length > 0)
88			{
89	matty	10	ui_process_events();
90	matty	3
91	matty	9	FD_ZERO(&rfds);
92	matty	10	FD_SET(sock, &rfds);
93	matty	9	tv.tv_sec = 0;
94			tv.tv_usec = 100;
95
96	matty	24	ret = select(sock + 1, &rfds, NULL, NULL, &tv);
97	matty	9
98			if (ret)
99	matty	3	{
100	matty	10	rcvd = read(sock, in.end, length);
101	matty	9
102			if (rcvd <= 0)
103			{
104	matty	10	STATUS("read: %s\n", strerror(errno));
105			return NULL;
106	matty	9	}
107
108	matty	10	in.end += rcvd;
109	matty	9	length -= rcvd;
110	matty	3	}
111			}
112
113	matty	10	return &in;
114			}
115
116			/* Establish a connection on the TCP layer */
117	matty	25	BOOL
118			tcp_connect(char *server)
119	matty	10	{
120			struct hostent *nslookup;
121			struct sockaddr_in servaddr;
122			int true = 1;
123
124			if ((nslookup = gethostbyname(server)) != NULL)
125			{
126	matty	24	memcpy(&servaddr.sin_addr, nslookup->h_addr,
127			sizeof(servaddr.sin_addr));
128	matty	10	}
129	matty	12	else if (!(servaddr.sin_addr.s_addr = inet_addr(server)))
130	matty	10	{
131			STATUS("%s: unable to resolve host\n", server);
132			return False;
133			}
134
135			if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
136			{
137			STATUS("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	matty	24	if (connect
145			(sock, (struct sockaddr *) &servaddr,
146			sizeof(struct sockaddr)) < 0)
147	matty	10	{
148			STATUS("connect: %s\n", strerror(errno));
149			close(sock);
150			return False;
151			}
152
153	matty	24	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true,
154			sizeof(true));
155	matty	10
156			in.size = 4096;
157			in.data = xmalloc(in.size);
158
159			out.size = 4096;
160			out.data = xmalloc(out.size);
161
162	matty	3	return True;
163			}
164	matty	10
165			/* Disconnect on the TCP layer */
166	matty	25	void
167			tcp_disconnect()
168	matty	10	{
169			close(sock);
170			}