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 "includes.h"

/* Establish a connection on the TCP layer */
HCONN tcp_connect(char *server)
{
        struct hostent *nslookup;
        struct sockaddr_in servaddr;
        struct connection *conn;
        int sock;
        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))
        {
                fprintf(stderr, "%s: unable to resolve host\n", server);
                return NULL;
        }

        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
        {
                fprintf(stderr, "socket: %s\n", strerror(errno));
                return NULL;
        }

        servaddr.sin_family = AF_INET;
        servaddr.sin_port = htons(TCP_PORT_RDP);

        if (connect(sock, (struct sockaddr *)&servaddr, sizeof(struct sockaddr)) < 0)
        {
                fprintf(stderr, "connect: %s\n", strerror(errno));
                close(sock);
                return NULL;
        }

        setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &true, sizeof(true));

        conn = xmalloc(sizeof(struct connection));
        STREAM_INIT(conn->in,  False);
        STREAM_INIT(conn->out, True);

        conn->tcp_socket = sock;
        return conn;
}

/* Disconnect on the TCP layer */
void tcp_disconnect(HCONN conn)
{
        close(conn->tcp_socket);
        free(conn);
}

/* Send TCP transport data packet */
BOOL tcp_send(HCONN conn)
{
        int length = conn->out.end;
        int sent, total = 0;

        while (total < length)
        {
                sent = write(conn->tcp_socket, conn->out.data + total,
                             length - total);

                if (sent <= 0)
                {
                        fprintf(stderr, "write: %s\n", strerror(errno));
                        return False;
                }

                total += sent;
        }

        conn->out.offset = 0;
        conn->out.end = conn->out.size;
        return True;
}

/* Receive a message on the TCP layer */
BOOL tcp_recv(HCONN conn, int length)
{
        int ret, rcvd = 0;
        struct timeval tv;
        fd_set rfds;

        STREAM_SIZE(conn->in, length);
        conn->in.end = conn->in.offset = 0;

        while (length > 0)
        {
                ui_process_events(conn->wnd, conn);

                FD_ZERO(&rfds);
                FD_SET(conn->tcp_socket, &rfds);
                tv.tv_sec = 0;
                tv.tv_usec = 100;

                ret = select(conn->tcp_socket+1, &rfds, NULL, NULL, &tv);

                if (ret)
                {
                        rcvd = read(conn->tcp_socket, conn->in.data
                                        + conn->in.end, length);

                        if (rcvd <= 0)
                        {
                                fprintf(stderr, "read: %s\n",
                                                strerror(errno));
                                return False;
                        }

                        conn->in.end += rcvd;
                        length -= rcvd;
                }
        }

        return True;
}
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 "includes.h"
22
23	/* Establish a connection on the TCP layer */
24	HCONN tcp_connect(char *server)
25	{
26	struct hostent *nslookup;
27	struct sockaddr_in servaddr;
28	struct connection *conn;
29	int sock;
30	int true = 1;
31
32	if ((nslookup = gethostbyname(server)) != NULL)
33	{
34	memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
35	}
36	else if (!inet_aton(server, &servaddr.sin_addr))
37	{
38	fprintf(stderr, "%s: unable to resolve host\n", server);
39	return NULL;
40	}
41
42	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
43	{
44	fprintf(stderr, "socket: %s\n", strerror(errno));
45	return NULL;
46	}
47
48	servaddr.sin_family = AF_INET;
49	servaddr.sin_port = htons(TCP_PORT_RDP);
50
51	if (connect(sock, (struct sockaddr *)&servaddr, sizeof(struct sockaddr)) < 0)
52	{
53	fprintf(stderr, "connect: %s\n", strerror(errno));
54	close(sock);
55	return NULL;
56	}
57
58	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &true, sizeof(true));
59
60	conn = xmalloc(sizeof(struct connection));
61	STREAM_INIT(conn->in, False);
62	STREAM_INIT(conn->out, True);
63
64	conn->tcp_socket = sock;
65	return conn;
66	}
67
68	/* Disconnect on the TCP layer */
69	void tcp_disconnect(HCONN conn)
70	{
71	close(conn->tcp_socket);
72	free(conn);
73	}
74
75	/* Send TCP transport data packet */
76	BOOL tcp_send(HCONN conn)
77	{
78	int length = conn->out.end;
79	int sent, total = 0;
80
81	while (total < length)
82	{
83	sent = write(conn->tcp_socket, conn->out.data + total,
84	length - total);
85
86	if (sent <= 0)
87	{
88	fprintf(stderr, "write: %s\n", strerror(errno));
89	return False;
90	}
91
92	total += sent;
93	}
94
95	conn->out.offset = 0;
96	conn->out.end = conn->out.size;
97	return True;
98	}
99
100	/* Receive a message on the TCP layer */
101	BOOL tcp_recv(HCONN conn, int length)
102	{
103	int ret, rcvd = 0;
104	struct timeval tv;
105	fd_set rfds;
106
107	STREAM_SIZE(conn->in, length);
108	conn->in.end = conn->in.offset = 0;
109
110	while (length > 0)
111	{
112	ui_process_events(conn->wnd, conn);
113
114	FD_ZERO(&rfds);
115	FD_SET(conn->tcp_socket, &rfds);
116	tv.tv_sec = 0;
117	tv.tv_usec = 100;
118
119	ret = select(conn->tcp_socket+1, &rfds, NULL, NULL, &tv);
120
121	if (ret)
122	{
123	rcvd = read(conn->tcp_socket, conn->in.data
124	+ conn->in.end, length);
125
126	if (rcvd <= 0)
127	{
128	fprintf(stderr, "read: %s\n",
129	strerror(errno));
130	return False;
131	}
132
133	conn->in.end += rcvd;
134	length -= rcvd;
135	}
136	}
137
138	return True;
139	}