741 lines
15 KiB
C
741 lines
15 KiB
C
/* $NetBSD: sys_bsd.c,v 1.31 2004/03/20 23:26:05 heas Exp $ */
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/*
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* Copyright (c) 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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from: static char sccsid[] = "@(#)sys_bsd.c 8.4 (Berkeley) 5/30/95";
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#else
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__RCSID("$NetBSD: sys_bsd.c,v 1.31 2004/03/20 23:26:05 heas Exp $");
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#endif
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#endif /* not lint */
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/*
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* The following routines try to encapsulate what is system dependent
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* (at least between 4.x and dos) which is used in telnet.c.
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*/
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <poll.h>
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#include <arpa/telnet.h>
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#include "ring.h"
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#include "defines.h"
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#include "externs.h"
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#include "types.h"
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#define SIG_FUNC_RET void
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SIG_FUNC_RET susp(int);
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SIG_FUNC_RET ayt(int);
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SIG_FUNC_RET intr(int);
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SIG_FUNC_RET intr2(int);
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SIG_FUNC_RET sendwin(int);
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SIG_FUNC_RET deadpeer(int);
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int
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tout, /* Output file descriptor */
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tin, /* Input file descriptor */
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net;
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struct termios old_tc = { 0 };
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extern struct termios new_tc;
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# ifndef TCSANOW
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# ifdef TCSETS
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# define TCSANOW TCSETS
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# define TCSADRAIN TCSETSW
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# define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
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# else
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# ifdef TCSETA
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# define TCSANOW TCSETA
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# define TCSADRAIN TCSETAW
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# define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
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# else
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# define TCSANOW TIOCSETA
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# define TCSADRAIN TIOCSETAW
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# define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
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# endif
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# endif
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# define tcsetattr(f, a, t) ioctl(f, a, (char *)t)
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# define cfgetospeed(ptr) ((ptr)->c_cflag&CBAUD)
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# ifdef CIBAUD
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# define cfgetispeed(ptr) (((ptr)->c_cflag&CIBAUD) >> IBSHIFT)
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# else
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# define cfgetispeed(ptr) cfgetospeed(ptr)
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# endif
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# endif /* TCSANOW */
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void
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init_sys(void)
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{
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tout = fileno(stdout);
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tin = fileno(stdin);
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errno = 0;
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}
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int
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TerminalWrite(char *buf, int n)
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{
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return write(tout, buf, n);
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}
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int
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TerminalRead(unsigned char *buf, int n)
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{
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return read(tin, buf, n);
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}
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/*
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*
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*/
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int
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TerminalAutoFlush(void)
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{
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return 1;
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}
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#ifdef KLUDGELINEMODE
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extern int kludgelinemode;
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#endif
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/*
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* TerminalSpecialChars()
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*
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* Look at an input character to see if it is a special character
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* and decide what to do.
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*
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* Output:
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*
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* 0 Don't add this character.
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* 1 Do add this character
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*/
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int
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TerminalSpecialChars(int c)
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{
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if (c == termIntChar) {
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intp();
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return 0;
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} else if (c == termQuitChar) {
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#ifdef KLUDGELINEMODE
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if (kludgelinemode)
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sendbrk();
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else
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#endif
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sendabort();
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return 0;
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} else if (c == termEofChar) {
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if (my_want_state_is_will(TELOPT_LINEMODE)) {
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sendeof();
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return 0;
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}
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return 1;
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} else if (c == termSuspChar) {
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sendsusp();
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return(0);
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} else if (c == termFlushChar) {
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xmitAO(); /* Transmit Abort Output */
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return 0;
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} else if (!MODE_LOCAL_CHARS(globalmode)) {
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if (c == termKillChar) {
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xmitEL();
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return 0;
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} else if (c == termEraseChar) {
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xmitEC(); /* Transmit Erase Character */
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return 0;
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}
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}
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return 1;
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}
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/*
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* Flush output to the terminal
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*/
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void
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TerminalFlushOutput(void)
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{
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int com = 0;
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(void) ioctl(fileno(stdout), TIOCFLUSH, &com);
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}
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void
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TerminalSaveState(void)
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{
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tcgetattr(0, &old_tc);
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new_tc = old_tc;
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}
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cc_t *
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tcval(int func)
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{
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switch(func) {
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case SLC_IP: return(&termIntChar);
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case SLC_ABORT: return(&termQuitChar);
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case SLC_EOF: return(&termEofChar);
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case SLC_EC: return(&termEraseChar);
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case SLC_EL: return(&termKillChar);
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case SLC_XON: return(&termStartChar);
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case SLC_XOFF: return(&termStopChar);
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case SLC_FORW1: return(&termForw1Char);
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case SLC_FORW2: return(&termForw2Char);
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case SLC_AO: return(&termFlushChar);
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case SLC_SUSP: return(&termSuspChar);
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case SLC_EW: return(&termWerasChar);
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case SLC_RP: return(&termRprntChar);
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case SLC_LNEXT: return(&termLiteralNextChar);
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case SLC_AYT: return(&termAytChar);
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case SLC_SYNCH:
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case SLC_BRK:
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case SLC_EOR:
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default:
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return((cc_t *)0);
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}
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}
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void
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TerminalDefaultChars(void)
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{
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memmove(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc));
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}
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#ifdef notdef
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void
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TerminalRestoreState(void)
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{
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}
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#endif
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/*
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* TerminalNewMode - set up terminal to a specific mode.
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* MODE_ECHO: do local terminal echo
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* MODE_FLOW: do local flow control
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* MODE_TRAPSIG: do local mapping to TELNET IAC sequences
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* MODE_EDIT: do local line editing
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*
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* Command mode:
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* MODE_ECHO|MODE_EDIT|MODE_FLOW|MODE_TRAPSIG
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* local echo
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* local editing
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* local xon/xoff
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* local signal mapping
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*
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* Linemode:
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* local/no editing
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* Both Linemode and Single Character mode:
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* local/remote echo
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* local/no xon/xoff
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* local/no signal mapping
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*/
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void
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TerminalNewMode(int f)
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{
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static int prevmode = 0;
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struct termios tmp_tc;
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int onoff;
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int old;
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cc_t esc;
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globalmode = f&~MODE_FORCE;
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if (prevmode == f)
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return;
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/*
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* Write any outstanding data before switching modes
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* ttyflush() returns 0 only when there is no more data
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* left to write out, it returns -1 if it couldn't do
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* anything at all, otherwise it returns 1 + the number
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* of characters left to write.
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#ifndef USE_TERMIO
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* We would really like to ask the kernel to wait for the output
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* to drain, like we can do with the TCSADRAIN, but we don't have
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* that option. The only ioctl that waits for the output to
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* drain, TIOCSETP, also flushes the input queue, which is NOT
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* what we want (TIOCSETP is like TCSADFLUSH).
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#endif
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*/
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old = ttyflush(SYNCHing|flushout);
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if (old < 0 || old > 1) {
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tcgetattr(tin, &tmp_tc);
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do {
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/*
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* Wait for data to drain, then flush again.
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*/
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tcsetattr(tin, TCSADRAIN, &tmp_tc);
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old = ttyflush(SYNCHing|flushout);
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} while (old < 0 || old > 1);
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}
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old = prevmode;
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prevmode = f&~MODE_FORCE;
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tmp_tc = new_tc;
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if (f&MODE_ECHO) {
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tmp_tc.c_lflag |= ECHO;
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tmp_tc.c_oflag |= ONLCR;
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if (crlf)
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tmp_tc.c_iflag |= ICRNL;
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} else {
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tmp_tc.c_lflag &= ~ECHO;
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tmp_tc.c_oflag &= ~ONLCR;
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# ifdef notdef
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if (crlf)
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tmp_tc.c_iflag &= ~ICRNL;
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# endif
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}
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if ((f&MODE_FLOW) == 0) {
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tmp_tc.c_iflag &= ~(IXOFF|IXON); /* Leave the IXANY bit alone */
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} else {
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if (restartany < 0) {
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tmp_tc.c_iflag |= IXOFF|IXON; /* Leave the IXANY bit alone */
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} else if (restartany > 0) {
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tmp_tc.c_iflag |= IXOFF|IXON|IXANY;
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} else {
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tmp_tc.c_iflag |= IXOFF|IXON;
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tmp_tc.c_iflag &= ~IXANY;
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}
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}
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if ((f&MODE_TRAPSIG) == 0) {
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tmp_tc.c_lflag &= ~ISIG;
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localchars = 0;
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} else {
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tmp_tc.c_lflag |= ISIG;
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localchars = 1;
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}
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if (f&MODE_EDIT) {
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tmp_tc.c_lflag |= ICANON;
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} else {
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tmp_tc.c_lflag &= ~ICANON;
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tmp_tc.c_iflag &= ~ICRNL;
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tmp_tc.c_cc[VMIN] = 1;
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tmp_tc.c_cc[VTIME] = 0;
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}
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if ((f&(MODE_EDIT|MODE_TRAPSIG)) == 0) {
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tmp_tc.c_lflag &= ~IEXTEN;
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}
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|
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if (f&MODE_SOFT_TAB) {
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# ifdef OXTABS
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tmp_tc.c_oflag |= OXTABS;
|
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# endif
|
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# ifdef TABDLY
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tmp_tc.c_oflag &= ~TABDLY;
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tmp_tc.c_oflag |= TAB3;
|
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# endif
|
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} else {
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# ifdef OXTABS
|
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tmp_tc.c_oflag &= ~OXTABS;
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# endif
|
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# ifdef TABDLY
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tmp_tc.c_oflag &= ~TABDLY;
|
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# endif
|
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}
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|
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if (f&MODE_LIT_ECHO) {
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# ifdef ECHOCTL
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tmp_tc.c_lflag &= ~ECHOCTL;
|
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# endif
|
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} else {
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# ifdef ECHOCTL
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tmp_tc.c_lflag |= ECHOCTL;
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# endif
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}
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|
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if (f == -1) {
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onoff = 0;
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||
} else {
|
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if (f & MODE_INBIN)
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tmp_tc.c_iflag &= ~ISTRIP;
|
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else
|
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tmp_tc.c_iflag |= ISTRIP;
|
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if (f & MODE_OUTBIN) {
|
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tmp_tc.c_cflag &= ~(CSIZE|PARENB);
|
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tmp_tc.c_cflag |= CS8;
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tmp_tc.c_oflag &= ~OPOST;
|
||
} else {
|
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tmp_tc.c_cflag &= ~(CSIZE|PARENB);
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tmp_tc.c_cflag |= old_tc.c_cflag & (CSIZE|PARENB);
|
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tmp_tc.c_oflag |= OPOST;
|
||
}
|
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onoff = 1;
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}
|
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|
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if (f != -1) {
|
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(void) signal(SIGTSTP, susp);
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(void) signal(SIGINFO, ayt);
|
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#if defined(USE_TERMIO) && defined(NOKERNINFO)
|
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tmp_tc.c_lflag |= NOKERNINFO;
|
||
#endif
|
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/*
|
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* We don't want to process ^Y here. It's just another
|
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* character that we'll pass on to the back end. It has
|
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* to process it because it will be processed when the
|
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* user attempts to read it, not when we send it.
|
||
*/
|
||
# ifdef VDSUSP
|
||
tmp_tc.c_cc[VDSUSP] = (cc_t)(_POSIX_VDISABLE);
|
||
# endif
|
||
/*
|
||
* If the VEOL character is already set, then use VEOL2,
|
||
* otherwise use VEOL.
|
||
*/
|
||
esc = (rlogin != _POSIX_VDISABLE) ? rlogin : escape;
|
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if ((tmp_tc.c_cc[VEOL] != esc)
|
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# ifdef VEOL2
|
||
&& (tmp_tc.c_cc[VEOL2] != esc)
|
||
# endif
|
||
) {
|
||
if (tmp_tc.c_cc[VEOL] == (cc_t)(_POSIX_VDISABLE))
|
||
tmp_tc.c_cc[VEOL] = esc;
|
||
# ifdef VEOL2
|
||
else if (tmp_tc.c_cc[VEOL2] == (cc_t)(_POSIX_VDISABLE))
|
||
tmp_tc.c_cc[VEOL2] = esc;
|
||
# endif
|
||
}
|
||
} else {
|
||
(void) signal(SIGINFO, (void (*)(int)) ayt_status);
|
||
(void) signal(SIGTSTP, SIG_DFL);
|
||
(void) sigsetmask(sigblock(0) & ~(1<<(SIGTSTP-1)));
|
||
tmp_tc = old_tc;
|
||
}
|
||
if (tcsetattr(tin, TCSADRAIN, &tmp_tc) < 0)
|
||
tcsetattr(tin, TCSANOW, &tmp_tc);
|
||
|
||
ioctl(tin, FIONBIO, (char *)&onoff);
|
||
ioctl(tout, FIONBIO, (char *)&onoff);
|
||
#if defined(TN3270)
|
||
if (noasynchtty == 0) {
|
||
ioctl(tin, FIOASYNC, (char *)&onoff);
|
||
}
|
||
#endif /* defined(TN3270) */
|
||
|
||
}
|
||
|
||
void
|
||
TerminalSpeeds(long *ispeed, long *ospeed)
|
||
{
|
||
long in, out;
|
||
|
||
out = cfgetospeed(&old_tc);
|
||
in = cfgetispeed(&old_tc);
|
||
if (in == 0)
|
||
in = out;
|
||
|
||
*ispeed = in;
|
||
*ospeed = out;
|
||
}
|
||
|
||
int
|
||
TerminalWindowSize(long *rows, long *cols)
|
||
{
|
||
struct winsize ws;
|
||
|
||
if (ioctl(fileno(stdin), TIOCGWINSZ, (char *)&ws) >= 0) {
|
||
*rows = ws.ws_row;
|
||
*cols = ws.ws_col;
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
NetClose(int fd)
|
||
{
|
||
return close(fd);
|
||
}
|
||
|
||
|
||
void
|
||
NetNonblockingIO(int fd, int onoff)
|
||
{
|
||
ioctl(fd, FIONBIO, (char *)&onoff);
|
||
}
|
||
|
||
#ifdef TN3270
|
||
void
|
||
NetSigIO(int fd, int onoff)
|
||
{
|
||
ioctl(fd, FIOASYNC, (char *)&onoff); /* hear about input */
|
||
}
|
||
|
||
void
|
||
NetSetPgrp(int fd)
|
||
{
|
||
int myPid;
|
||
|
||
myPid = getpid();
|
||
fcntl(fd, F_SETOWN, myPid);
|
||
}
|
||
#endif /*defined(TN3270)*/
|
||
|
||
/*
|
||
* Various signal handling routines.
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
SIG_FUNC_RET
|
||
intr(int sig)
|
||
{
|
||
if (localchars) {
|
||
intp();
|
||
return;
|
||
}
|
||
setcommandmode();
|
||
longjmp(toplevel, -1);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
SIG_FUNC_RET
|
||
intr2(int sig)
|
||
{
|
||
if (localchars) {
|
||
#ifdef KLUDGELINEMODE
|
||
if (kludgelinemode)
|
||
sendbrk();
|
||
else
|
||
#endif
|
||
sendabort();
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
SIG_FUNC_RET
|
||
susp(int sig)
|
||
{
|
||
if ((rlogin != _POSIX_VDISABLE) && rlogin_susp())
|
||
return;
|
||
if (localchars)
|
||
sendsusp();
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
SIG_FUNC_RET
|
||
sendwin(int sig)
|
||
{
|
||
if (connected) {
|
||
sendnaws();
|
||
}
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
SIG_FUNC_RET
|
||
ayt(int sig)
|
||
{
|
||
if (connected)
|
||
sendayt();
|
||
else
|
||
ayt_status();
|
||
}
|
||
|
||
|
||
void
|
||
sys_telnet_init(void)
|
||
{
|
||
(void) signal(SIGINT, intr);
|
||
(void) signal(SIGQUIT, intr2);
|
||
(void) signal(SIGPIPE, SIG_IGN);
|
||
(void) signal(SIGWINCH, sendwin);
|
||
(void) signal(SIGTSTP, susp);
|
||
(void) signal(SIGINFO, ayt);
|
||
|
||
setconnmode(0);
|
||
|
||
NetNonblockingIO(net, 1);
|
||
|
||
#ifdef TN3270
|
||
if (noasynchnet == 0) { /* DBX can't handle! */
|
||
NetSigIO(net, 1);
|
||
NetSetPgrp(net);
|
||
}
|
||
#endif /* defined(TN3270) */
|
||
|
||
if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -1) {
|
||
perror("SetSockOpt");
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Process rings -
|
||
*
|
||
* This routine tries to fill up/empty our various rings.
|
||
*
|
||
* The parameter specifies whether this is a poll operation,
|
||
* or a block-until-something-happens operation.
|
||
*
|
||
* The return value is 1 if something happened, 0 if not, < 0 if an
|
||
* error occurred.
|
||
*/
|
||
|
||
int
|
||
process_rings(int netin, int netout, int netex, int ttyin, int ttyout,
|
||
int dopoll) /* If 0, then block until something to do */
|
||
{
|
||
struct pollfd set[3];
|
||
int c;
|
||
/* One wants to be a bit careful about setting returnValue
|
||
* to one, since a one implies we did some useful work,
|
||
* and therefore probably won't be called to block next
|
||
* time (TN3270 mode only).
|
||
*/
|
||
int returnValue = 0;
|
||
|
||
set[0].fd = net;
|
||
set[0].events = (netout ? POLLOUT : 0) | (netin ? POLLIN : 0) |
|
||
(netex ? POLLPRI : 0);
|
||
set[1].fd = tout;
|
||
set[1].events = ttyout ? POLLOUT : 0;
|
||
set[2].fd = tin;
|
||
set[2].events = ttyin ? POLLIN : 0;
|
||
|
||
if ((c = poll(set, 3, dopoll ? 0 : INFTIM)) < 0) {
|
||
if (c == -1) {
|
||
/*
|
||
* we can get EINTR if we are in line mode,
|
||
* and the user does an escape (TSTP), or
|
||
* some other signal generator.
|
||
*/
|
||
if (errno == EINTR) {
|
||
return 0;
|
||
}
|
||
#ifdef TN3270
|
||
/*
|
||
* we can get EBADF if we were in transparent
|
||
* mode, and the transcom process died.
|
||
*/
|
||
if (errno == EBADF)
|
||
return 0;
|
||
#endif /* defined(TN3270) */
|
||
/* I don't like this, does it ever happen? */
|
||
printf("sleep(5) from telnet, after poll\r\n");
|
||
sleep(5);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Any urgent data?
|
||
*/
|
||
if (set[0].revents & POLLPRI) {
|
||
SYNCHing = 1;
|
||
(void) ttyflush(1); /* flush already enqueued data */
|
||
}
|
||
|
||
/*
|
||
* Something to read from the network...
|
||
*/
|
||
if (set[0].revents & POLLIN) {
|
||
int canread;
|
||
|
||
canread = ring_empty_consecutive(&netiring);
|
||
c = recv(net, (char *)netiring.supply, canread, 0);
|
||
if (c < 0 && errno == EWOULDBLOCK) {
|
||
c = 0;
|
||
} else if (c <= 0) {
|
||
return -1;
|
||
}
|
||
if (netdata) {
|
||
Dump('<', netiring.supply, c);
|
||
}
|
||
if (c)
|
||
ring_supplied(&netiring, c);
|
||
returnValue = 1;
|
||
}
|
||
|
||
/*
|
||
* Something to read from the tty...
|
||
*/
|
||
if (set[2].revents & POLLIN) {
|
||
c = TerminalRead(ttyiring.supply, ring_empty_consecutive(&ttyiring));
|
||
if (c < 0 && errno == EIO)
|
||
c = 0;
|
||
if (c < 0 && errno == EWOULDBLOCK) {
|
||
c = 0;
|
||
} else {
|
||
if (c < 0) {
|
||
return -1;
|
||
}
|
||
if (c == 0) {
|
||
/* must be an EOF... */
|
||
if (MODE_LOCAL_CHARS(globalmode) && isatty(tin)) {
|
||
*ttyiring.supply = termEofChar;
|
||
c = 1;
|
||
} else {
|
||
clienteof = 1;
|
||
shutdown(net, 1);
|
||
return 0;
|
||
}
|
||
}
|
||
if (termdata) {
|
||
Dump('<', ttyiring.supply, c);
|
||
}
|
||
ring_supplied(&ttyiring, c);
|
||
}
|
||
returnValue = 1; /* did something useful */
|
||
}
|
||
|
||
if (set[0].revents & POLLOUT) {
|
||
returnValue |= netflush();
|
||
}
|
||
|
||
if (set[1].revents & (POLLHUP|POLLNVAL))
|
||
return(-1);
|
||
|
||
if (set[1].revents & POLLOUT) {
|
||
returnValue |= (ttyflush(SYNCHing|flushout) > 0);
|
||
}
|
||
|
||
return returnValue;
|
||
}
|