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	/*
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 = send(sock, s->data + total, length - total, 0);
60	if (sent <= 0)
61	{
62	error("send: %s\n", strerror(errno));
63	return;
64	}
65
66	total += sent;
67	}
68	}
69
70	/* Receive a message on the TCP layer */
71	STREAM
72	tcp_recv(int length)
73	{
74	int rcvd = 0;
75
76	if (length > in.size)
77	{
78	in.data = xrealloc(in.data, length);
79	in.size = length;
80	}
81
82	in.end = in.p = in.data;
83
84	while (length > 0)
85	{
86	ui_select(sock);
87
88	rcvd = recv(sock, in.end, length, 0);
89	if (rcvd == -1)
90	{
91	error("recv: %s\n", strerror(errno));
92	return NULL;
93	}
94
95	in.end += rcvd;
96	length -= rcvd;
97	}
98
99	return &in;
100	}
101
102	/* Establish a connection on the TCP layer */
103	BOOL
104	tcp_connect(char *server)
105	{
106	struct hostent *nslookup;
107	struct sockaddr_in servaddr;
108	int true = 1;
109
110	if ((nslookup = gethostbyname(server)) != NULL)
111	{
112	memcpy(&servaddr.sin_addr, nslookup->h_addr,
113	sizeof(servaddr.sin_addr));
114	}
115	else if (!(servaddr.sin_addr.s_addr = inet_addr(server)))
116	{
117	error("%s: unable to resolve host\n", server);
118	return False;
119	}
120
121	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
122	{
123	error("socket: %s\n", strerror(errno));
124	return False;
125	}
126
127	servaddr.sin_family = AF_INET;
128	servaddr.sin_port = htons(TCP_PORT_RDP);
129
130	if (connect
131	(sock, (struct sockaddr *) &servaddr,
132	sizeof(struct sockaddr)) < 0)
133	{
134	error("connect: %s\n", strerror(errno));
135	close(sock);
136	return False;
137	}
138
139	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true,
140	sizeof(true));
141
142	in.size = 4096;
143	in.data = xmalloc(in.size);
144
145	out.size = 4096;
146	out.data = xmalloc(out.size);
147
148	return True;
149	}
150
151	/* Disconnect on the TCP layer */
152	void
153	tcp_disconnect()
154	{
155	close(sock);
156	}