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