diff options
Diffstat (limited to 'comms/tn3270/files/telnet/network.c')
| -rw-r--r-- | comms/tn3270/files/telnet/network.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/comms/tn3270/files/telnet/network.c b/comms/tn3270/files/telnet/network.c new file mode 100644 index 00000000000..f2aefd91159 --- /dev/null +++ b/comms/tn3270/files/telnet/network.c @@ -0,0 +1,180 @@ +/* $NetBSD: network.c,v 1.1.1.1 2010/01/17 01:33:29 dholland Exp $ */ +/* From NetBSD: network.c,v 1.17 2004/03/20 23:26:05 heas Exp */ + +/* + * 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. 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. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)network.c 8.2 (Berkeley) 12/15/93"; +#else +__RCSID("$NetBSD: network.c,v 1.1.1.1 2010/01/17 01:33:29 dholland Exp $"); +#endif +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/time.h> + +#include <errno.h> +#include <unistd.h> +#include <poll.h> + +#include <arpa/telnet.h> + +#include "ring.h" +#include "defines.h" +#include "externs.h" + +Ring netoring, netiring; +unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ]; + +/* + * Initialize internal network data structures. + */ + +void +init_network(void) +{ + 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(void) +{ + struct pollfd set[1]; + int value; + + set[0].fd = net; + set[0].events = POLLPRI; + do { + value = poll(set, 1, 0); + } while ((value == -1) && (errno == EINTR)); + + if (value < 0) { + perror("poll"); + (void) quit(0, NULL); + /* NOTREACHED */ + } + if (set[0].revents & POLLPRI) { + return 1; + } else { + return 0; + } +} + + +/* + * setneturg() + * + * Sets "neturg" to the current location. + */ + +void +setneturg(void) +{ + 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(void) +{ + int n, n1; + +#ifdef ENCRYPTION + if (encrypt_output) + ring_encrypt(&netoring, encrypt_output); +#endif /* ENCRYPTION */ + 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); + ExitString("Connection closed by foreign host.\n", 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; + } +} |