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.
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34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: src/usr.bin/telnet/network.c,v 1.2.14.1 2002/04/13 11:07:13 markm Exp $");
39 static const char sccsid[] = "@(#)network.c 8.2 (Berkeley) 12/15/93";
42 #include <sys/types.h>
43 #include <sys/socket.h>
48 #include <arpa/telnet.h>
57 Ring netoring, netiring;
58 unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
61 * Initialize internal network data structures.
67 if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) {
70 if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) {
78 * Check to see if any out-of-band data exists on a socket (for
79 * Telnet "synch" processing).
85 static struct timeval timeout = { 0, 0 };
91 FD_SET(net, &excepts);
92 value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
93 } while ((value == -1) && (errno == EINTR));
100 if (FD_ISSET(net, &excepts)) {
111 * Sets "neturg" to the current location.
117 ring_mark(&netoring);
123 * Send as much data as possible to the network,
124 * handling requests for urgent data.
126 * The return value indicates whether we did any
135 if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
136 if (!ring_at_mark(&netoring)) {
137 n = send(net, (char *)netoring.consume, n, 0); /* normal write */
140 * In 4.2 (and 4.3) systems, there is some question about
141 * what byte in a sendOOB operation is the "OOB" data.
142 * To make ourselves compatible, we only send ONE byte
143 * out of band, the one WE THINK should be OOB (though
144 * we really have more the TCP philosophy of urgent data
145 * rather than the Unix philosophy of OOB data).
147 n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
151 if (errno != ENOBUFS && errno != EWOULDBLOCK) {
155 ring_clear_mark(&netoring);
156 longjmp(peerdied, -1);
162 Dump('>', netoring.consume, n);
165 ring_consumed(&netoring, n);
167 * If we sent all, and more to send, then recurse to pick
170 if ((n1 == n) && ring_full_consecutive(&netoring)) {