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/tcp.h> /* TCP_NODELAY */
#include <arpa/inet.h>  /* inet_aton */
#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 (!inet_aton(server, &servaddr.sin_addr))
        {
                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, &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 1999-2000
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	#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/tcp.h> /* TCP_NODELAY */
26	#include <arpa/inet.h> /* inet_aton */
27	#include <errno.h> /* errno */
28	#include "rdesktop.h"
29
30	static int sock;
31	static struct stream in;
32	static struct stream out;
33
34	/* Initialise TCP transport data packet */
35	STREAM tcp_init(int maxlen)
36	{
37	if (maxlen > out.size)
38	{
39	out.data = xrealloc(out.data, maxlen);
40	out.size = maxlen;
41	}
42
43	out.p = out.data;
44	out.end = out.data + out.size;
45	return &out;
46	}
47
48	/* Send TCP transport data packet */
49	void tcp_send(STREAM s)
50	{
51	int length = s->end - s->data;
52	int sent, total = 0;
53
54	while (total < length)
55	{
56	sent = write(sock, s->data + total, length - total);
57
58	if (sent <= 0)
59	{
60	STATUS("write: %s\n", strerror(errno));
61	return;
62	}
63
64	total += sent;
65	}
66	}
67
68	/* Receive a message on the TCP layer */
69	STREAM tcp_recv(int length)
70	{
71	int ret, rcvd = 0;
72	struct timeval tv;
73	fd_set rfds;
74
75	if (length > in.size)
76	{
77	in.data = xrealloc(in.data, length);
78	in.size = length;
79	}
80
81	in.end = in.p = in.data;
82
83	while (length > 0)
84	{
85	ui_process_events();
86
87	FD_ZERO(&rfds);
88	FD_SET(sock, &rfds);
89	tv.tv_sec = 0;
90	tv.tv_usec = 100;
91
92	ret = select(sock+1, &rfds, NULL, NULL, &tv);
93
94	if (ret)
95	{
96	rcvd = read(sock, in.end, length);
97
98	if (rcvd <= 0)
99	{
100	STATUS("read: %s\n", strerror(errno));
101	return NULL;
102	}
103
104	in.end += rcvd;
105	length -= rcvd;
106	}
107	}
108
109	return &in;
110	}
111
112	/* Establish a connection on the TCP layer */
113	BOOL tcp_connect(char *server)
114	{
115	struct hostent *nslookup;
116	struct sockaddr_in servaddr;
117	int true = 1;
118
119	if ((nslookup = gethostbyname(server)) != NULL)
120	{
121	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
122	}
123	else if (!inet_aton(server, &servaddr.sin_addr))
124	{
125	STATUS("%s: unable to resolve host\n", server);
126	return False;
127	}
128
129	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
130	{
131	STATUS("socket: %s\n", strerror(errno));
132	return False;
133	}
134
135	servaddr.sin_family = AF_INET;
136	servaddr.sin_port = htons(TCP_PORT_RDP);
137
138	if (connect(sock, (struct sockaddr *)&servaddr, sizeof(struct sockaddr)) < 0)
139	{
140	STATUS("connect: %s\n", strerror(errno));
141	close(sock);
142	return False;
143	}
144
145	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &true, sizeof(true));
146
147	in.size = 4096;
148	in.data = xmalloc(in.size);
149
150	out.size = 4096;
151	out.data = xmalloc(out.size);
152
153	return True;
154	}
155
156	/* Disconnect on the TCP layer */
157	void tcp_disconnect()
158	{
159	close(sock);
160	}