freebsd-dev/usr.bin/telnet/network.c
Mark Murray 012b940383 Code merge and diff reduction between this and crypto telnet.
Also remove useless AUTHENTICATION code. We have never compiled this
here, and it is doubtful that it even works without crypto.
2001-08-20 12:21:31 +00:00

180 lines
4.5 KiB
C

/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static const char sccsid[] = "@(#)network.c 8.2 (Berkeley) 12/15/93";
#else
static const char rcsid[] =
"$FreeBSD$";
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <arpa/telnet.h>
#include <unistd.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "fdset.h"
Ring netoring, netiring;
unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
/*
* Initialize internal network data structures.
*/
void
init_network()
{
if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) {
exit(1);
}
if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) {
exit(1);
}
NetTrace = stdout;
}
/*
* Check to see if any out-of-band data exists on a socket (for
* Telnet "synch" processing).
*/
int
stilloob()
{
static struct timeval timeout = { 0 };
fd_set excepts;
int value;
do {
FD_ZERO(&excepts);
FD_SET(net, &excepts);
value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
} while ((value == -1) && (errno == EINTR));
if (value < 0) {
perror("select");
(void) quit();
/* NOTREACHED */
}
if (FD_ISSET(net, &excepts)) {
return 1;
} else {
return 0;
}
}
/*
* setneturg()
*
* Sets "neturg" to the current location.
*/
void
setneturg()
{
ring_mark(&netoring);
}
/*
* netflush
* Send as much data as possible to the network,
* handling requests for urgent data.
*
* The return value indicates whether we did any
* useful work.
*/
int
netflush()
{
register int n, n1;
if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
if (!ring_at_mark(&netoring)) {
n = send(net, (char *)netoring.consume, n, 0); /* normal write */
} else {
/*
* In 4.2 (and 4.3) systems, there is some question about
* what byte in a sendOOB operation is the "OOB" data.
* To make ourselves compatible, we only send ONE byte
* out of band, the one WE THINK should be OOB (though
* we really have more the TCP philosophy of urgent data
* rather than the Unix philosophy of OOB data).
*/
n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
}
}
if (n < 0) {
if (errno != ENOBUFS && errno != EWOULDBLOCK) {
setcommandmode();
perror(hostname);
(void)NetClose(net);
ring_clear_mark(&netoring);
longjmp(peerdied, -1);
/*NOTREACHED*/
}
n = 0;
}
if (netdata && n) {
Dump('>', netoring.consume, n);
}
if (n) {
ring_consumed(&netoring, n);
/*
* If we sent all, and more to send, then recurse to pick
* up the other half.
*/
if ((n1 == n) && ring_full_consecutive(&netoring)) {
(void) netflush();
}
return 1;
} else {
return 0;
}
}