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 = 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(int length)
{
        int rcvd = 0;

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

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

        while (length > 0)
        {
                ui_select(sock);

                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 = 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	matty	3	/*
2			rdesktop: A Remote Desktop Protocol client.
3			Protocol services - TCP layer
4	matty	30	Copyright (C) Matthew Chapman 1999-2001
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
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	33	sent = send(sock, s->data + total, length - total, 0);
60	matty	3	if (sent <= 0)
61			{
62	matty	33	error("send: %s\n", strerror(errno));
63	matty	10	return;
64	matty	3	}
65
66			total += sent;
67			}
68			}
69
70			/* Receive a message on the TCP layer */
71	matty	25	STREAM
72			tcp_recv(int length)
73	matty	3	{
74	matty	33	int rcvd = 0;
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	33	ui_select(sock);
87	matty	3
88	matty	33	rcvd = recv(sock, in.end, length, 0);
89			if (rcvd == -1)
90	matty	3	{
91	matty	33	error("recv: %s\n", strerror(errno));
92			return NULL;
93			}
94	matty	9
95	matty	33	in.end += rcvd;
96			length -= rcvd;
97	matty	3	}
98
99	matty	10	return &in;
100			}
101
102			/* Establish a connection on the TCP layer */
103	matty	25	BOOL
104			tcp_connect(char *server)
105	matty	10	{
106			struct hostent *nslookup;
107			struct sockaddr_in servaddr;
108			int true = 1;
109
110			if ((nslookup = gethostbyname(server)) != NULL)
111			{
112	matty	24	memcpy(&servaddr.sin_addr, nslookup->h_addr,
113			sizeof(servaddr.sin_addr));
114	matty	10	}
115	matty	12	else if (!(servaddr.sin_addr.s_addr = inet_addr(server)))
116	matty	10	{
117	matty	30	error("%s: unable to resolve host\n", server);
118	matty	10	return False;
119			}
120
121			if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
122			{
123	matty	30	error("socket: %s\n", strerror(errno));
124	matty	10	return False;
125			}
126
127			servaddr.sin_family = AF_INET;
128			servaddr.sin_port = htons(TCP_PORT_RDP);
129
130	matty	24	if (connect
131			(sock, (struct sockaddr *) &servaddr,
132			sizeof(struct sockaddr)) < 0)
133	matty	10	{
134	matty	30	error("connect: %s\n", strerror(errno));
135	matty	10	close(sock);
136			return False;
137			}
138
139	matty	24	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true,
140			sizeof(true));
141	matty	10
142			in.size = 4096;
143			in.data = xmalloc(in.size);
144
145			out.size = 4096;
146			out.data = xmalloc(out.size);
147
148	matty	3	return True;
149			}
150	matty	10
151			/* Disconnect on the TCP layer */
152	matty	25	void
153			tcp_disconnect()
154	matty	10	{
155			close(sock);
156			}