2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static const char sccsid[] = "@(#)network.c 8.2 (Berkeley) 12/15/93";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/types.h>
43 #include <sys/socket.h>
49 #include <arpa/telnet.h>
58 Ring netoring, netiring;
59 unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
62 * Initialize internal network data structures.
68 if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) {
71 if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) {
79 * Check to see if any out-of-band data exists on a socket (for
80 * Telnet "synch" processing).
86 static struct timeval timeout = { 0, 0 };
92 FD_SET(net, &excepts);
93 value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
94 } while ((value == -1) && (errno == EINTR));
101 if (FD_ISSET(net, &excepts)) {
112 * Sets "neturg" to the current location.
118 ring_mark(&netoring);
124 * Send as much data as possible to the network,
125 * handling requests for urgent data.
127 * The return value indicates whether we did any
138 ring_encrypt(&netoring, encrypt_output);
139 #endif /* ENCRYPTION */
140 if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
141 if (!ring_at_mark(&netoring)) {
142 n = send(net, (char *)netoring.consume, n, 0); /* normal write */
145 * In 4.2 (and 4.3) systems, there is some question about
146 * what byte in a sendOOB operation is the "OOB" data.
147 * To make ourselves compatible, we only send ONE byte
148 * out of band, the one WE THINK should be OOB (though
149 * we really have more the TCP philosophy of urgent data
150 * rather than the Unix philosophy of OOB data).
152 n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
156 if (errno != ENOBUFS && errno != EWOULDBLOCK) {
160 ring_clear_mark(&netoring);
161 ExitString("Connection closed by foreign host.\n", 1);
167 Dump('>', netoring.consume, n);
170 ring_consumed(&netoring, n);
172 * If we sent all, and more to send, then recurse to pick
175 if ((n1 == n) && ring_full_consecutive(&netoring)) {