PageRenderTime 26ms CodeModel.GetById 10ms app.highlight 11ms RepoModel.GetById 2ms app.codeStats 0ms

/crypto/heimdal/appl/telnet/telnet/network.c

https://bitbucket.org/freebsd/freebsd-head/
C | 173 lines | 87 code | 20 blank | 66 comment | 32 complexity | 5420c5fb5d7c575d078399461f495597 MD5 | raw file
  1/*
  2 * Copyright (c) 1988, 1993
  3 *	The Regents of the University of California.  All rights reserved.
  4 *
  5 * Redistribution and use in source and binary forms, with or without
  6 * modification, are permitted provided that the following conditions
  7 * are met:
  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.
 20 *
 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
 31 * SUCH DAMAGE.
 32 */
 33
 34#include "telnet_locl.h"
 35
 36RCSID("$Id$");
 37
 38Ring		netoring, netiring;
 39size_t		netobufsize = 64*1024;
 40size_t		netibufsize = 64*1024;
 41
 42/*
 43 * Initialize internal network data structures.
 44 */
 45
 46void
 47init_network(void)
 48{
 49    void *obuf, *ibuf;
 50
 51    if ((obuf = malloc(netobufsize)) == NULL)
 52	exit(1);
 53    if ((ibuf = malloc(netibufsize)) == NULL)
 54	exit(1);
 55
 56    if (ring_init(&netoring, obuf, netobufsize) != 1) {
 57	exit(1);
 58    }
 59    if (ring_init(&netiring, ibuf, netibufsize) != 1) {
 60	exit(1);
 61    }
 62    NetTrace = stdout;
 63}
 64
 65
 66/*
 67 * Check to see if any out-of-band data exists on a socket (for
 68 * Telnet "synch" processing).
 69 */
 70
 71int
 72stilloob(void)
 73{
 74    static struct timeval timeout = { 0 };
 75    fd_set	excepts;
 76    int value;
 77
 78    do {
 79	FD_ZERO(&excepts);
 80	if (net >= FD_SETSIZE)
 81	    errx (1, "fd too large");
 82	FD_SET(net, &excepts);
 83	value = select(net+1, 0, 0, &excepts, &timeout);
 84    } while ((value == -1) && (errno == EINTR));
 85
 86    if (value < 0) {
 87	perror("select");
 88	quit();
 89	/* NOTREACHED */
 90    }
 91    if (FD_ISSET(net, &excepts)) {
 92	return 1;
 93    } else {
 94	return 0;
 95    }
 96}
 97
 98
 99/*
100 *  setneturg()
101 *
102 *	Sets "neturg" to the current location.
103 */
104
105void
106setneturg(void)
107{
108    ring_mark(&netoring);
109}
110
111
112/*
113 *  netflush
114 *		Send as much data as possible to the network,
115 *	handling requests for urgent data.
116 *
117 *		The return value indicates whether we did any
118 *	useful work.
119 */
120
121
122int
123netflush(void)
124{
125    int n, n1;
126
127#if	defined(ENCRYPTION)
128    if (encrypt_output)
129	ring_encrypt(&netoring, encrypt_output);
130#endif
131    if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
132	if (!ring_at_mark(&netoring)) {
133	    n = send(net, (char *)netoring.consume, n, 0); /* normal write */
134	} else {
135	    /*
136	     * In 4.2 (and 4.3) systems, there is some question about
137	     * what byte in a sendOOB operation is the "OOB" data.
138	     * To make ourselves compatible, we only send ONE byte
139	     * out of band, the one WE THINK should be OOB (though
140	     * we really have more the TCP philosophy of urgent data
141	     * rather than the Unix philosophy of OOB data).
142	     */
143	    n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
144	}
145    }
146    if (n < 0) {
147	if (errno != ENOBUFS && errno != EWOULDBLOCK) {
148	    setcommandmode();
149	    perror(hostname);
150	    NetClose(net);
151	    ring_clear_mark(&netoring);
152	    longjmp(peerdied, -1);
153	    /*NOTREACHED*/
154	}
155	n = 0;
156    }
157    if (netdata && n) {
158	Dump('>', netoring.consume, n);
159    }
160    if (n) {
161	ring_consumed(&netoring, n);
162	/*
163	 * If we sent all, and more to send, then recurse to pick
164	 * up the other half.
165	 */
166	if ((n1 == n) && ring_full_consecutive(&netoring)) {
167	    netflush();
168	}
169	return 1;
170    } else {
171	return 0;
172    }
173}