sys_bsd.c revision 275508 
1/*
2 * Copyright (c) 1988, 1990, 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#if 0
35#ifndef lint
36static const char sccsid[] = "@(#)sys_bsd.c	8.4 (Berkeley) 5/30/95";
37#endif
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: stable/10/contrib/telnet/telnet/sys_bsd.c 275508 2014-12-05 12:23:29Z ngie $");
41
42/*
43 * The following routines try to encapsulate what is system dependent
44 * (at least between 4.x and dos) which is used in telnet.c.
45 */
46
47#include <sys/param.h>
48#include <sys/socket.h>
49#include <sys/time.h>
50#include <err.h>
51#include <errno.h>
52#include <fcntl.h>
53#include <signal.h>
54#include <stdlib.h>
55#include <unistd.h>
56#include <arpa/telnet.h>
57
58#include "ring.h"
59#include "fdset.h"
60#include "defines.h"
61#include "externs.h"
62#include "types.h"
63#include "baud.h"
64
65int
66	tout,			/* Output file descriptor */
67	tin,			/* Input file descriptor */
68	net;
69
70#ifndef	USE_TERMIO
71struct	tchars otc = { 0 }, ntc = { 0 };
72struct	ltchars oltc = { 0 }, nltc = { 0 };
73struct	sgttyb ottyb = { 0 }, nttyb = { 0 };
74int	olmode = 0;
75# define cfgetispeed(ptr)	(ptr)->sg_ispeed
76# define cfgetospeed(ptr)	(ptr)->sg_ospeed
77# define old_tc ottyb
78
79#else	/* USE_TERMIO */
80struct	termio old_tc = { 0, 0, 0, 0, {}, 0, 0 };
81
82# ifndef	TCSANOW
83#  ifdef TCSETS
84#   define	TCSANOW		TCSETS
85#   define	TCSADRAIN	TCSETSW
86#   define	tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
87#  else
88#   ifdef TCSETA
89#    define	TCSANOW		TCSETA
90#    define	TCSADRAIN	TCSETAW
91#    define	tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
92#   else
93#    define	TCSANOW		TIOCSETA
94#    define	TCSADRAIN	TIOCSETAW
95#    define	tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
96#   endif
97#  endif
98#  define	tcsetattr(f, a, t) ioctl(f, a, (char *)t)
99#  define	cfgetospeed(ptr)	((ptr)->c_cflag&CBAUD)
100#  ifdef CIBAUD
101#   define	cfgetispeed(ptr)	(((ptr)->c_cflag&CIBAUD) >> IBSHIFT)
102#  else
103#   define	cfgetispeed(ptr)	cfgetospeed(ptr)
104#  endif
105# endif /* TCSANOW */
106# ifdef	sysV88
107# define TIOCFLUSH TC_PX_DRAIN
108# endif
109#endif	/* USE_TERMIO */
110
111static fd_set *ibitsp, *obitsp, *xbitsp;
112int fdsn;
113
114#ifdef	SIGINT
115static SIG_FUNC_RET intr(int);
116#endif	/* SIGINT */
117#ifdef	SIGQUIT
118static SIG_FUNC_RET intr2(int);
119#endif	/* SIGQUIT */
120#ifdef	SIGTSTP
121static SIG_FUNC_RET susp(int);
122#endif	/* SIGTSTP */
123#ifdef	SIGINFO
124static SIG_FUNC_RET ayt(int);
125#endif
126
127void
128init_sys(void)
129{
130    tout = fileno(stdout);
131    tin = fileno(stdin);
132    errno = 0;
133}
134
135int
136TerminalWrite(char *buf, int n)
137{
138    return write(tout, buf, n);
139}
140
141int
142TerminalRead(char *buf, int n)
143{
144    return read(tin, buf, n);
145}
146
147/*
148 *
149 */
150
151int
152TerminalAutoFlush(void)
153{
154#if	defined(LNOFLSH)
155    int flush;
156
157    ioctl(0, TIOCLGET, (char *)&flush);
158    return !(flush&LNOFLSH);	/* if LNOFLSH, no autoflush */
159#else	/* LNOFLSH */
160    return 1;
161#endif	/* LNOFLSH */
162}
163
164#ifdef	KLUDGELINEMODE
165extern int kludgelinemode;
166#endif
167/*
168 * TerminalSpecialChars()
169 *
170 * Look at an input character to see if it is a special character
171 * and decide what to do.
172 *
173 * Output:
174 *
175 *	0	Don't add this character.
176 *	1	Do add this character
177 */
178
179int
180TerminalSpecialChars(int c)
181{
182    if (c == termIntChar) {
183	intp();
184	return 0;
185    } else if (c == termQuitChar) {
186#ifdef	KLUDGELINEMODE
187	if (kludgelinemode)
188	    sendbrk();
189	else
190#endif
191	    sendabort();
192	return 0;
193    } else if (c == termEofChar) {
194	if (my_want_state_is_will(TELOPT_LINEMODE)) {
195	    sendeof();
196	    return 0;
197	}
198	return 1;
199    } else if (c == termSuspChar) {
200	sendsusp();
201	return(0);
202    } else if (c == termFlushChar) {
203	xmitAO();		/* Transmit Abort Output */
204	return 0;
205    } else if (!MODE_LOCAL_CHARS(globalmode)) {
206	if (c == termKillChar) {
207	    xmitEL();
208	    return 0;
209	} else if (c == termEraseChar) {
210	    xmitEC();		/* Transmit Erase Character */
211	    return 0;
212	}
213    }
214    return 1;
215}
216
217
218/*
219 * Flush output to the terminal
220 */
221
222void
223TerminalFlushOutput(void)
224{
225#ifdef	TIOCFLUSH
226    (void) ioctl(fileno(stdout), TIOCFLUSH, (char *) 0);
227#else
228    (void) ioctl(fileno(stdout), TCFLSH, (char *) 0);
229#endif
230}
231
232void
233TerminalSaveState(void)
234{
235#ifndef	USE_TERMIO
236    ioctl(0, TIOCGETP, (char *)&ottyb);
237    ioctl(0, TIOCGETC, (char *)&otc);
238    ioctl(0, TIOCGLTC, (char *)&oltc);
239    ioctl(0, TIOCLGET, (char *)&olmode);
240
241    ntc = otc;
242    nltc = oltc;
243    nttyb = ottyb;
244
245#else	/* USE_TERMIO */
246    tcgetattr(0, &old_tc);
247
248    new_tc = old_tc;
249
250#ifndef	VDISCARD
251    termFlushChar = CONTROL('O');
252#endif
253#ifndef	VWERASE
254    termWerasChar = CONTROL('W');
255#endif
256#ifndef	VREPRINT
257    termRprntChar = CONTROL('R');
258#endif
259#ifndef	VLNEXT
260    termLiteralNextChar = CONTROL('V');
261#endif
262#ifndef	VSTART
263    termStartChar = CONTROL('Q');
264#endif
265#ifndef	VSTOP
266    termStopChar = CONTROL('S');
267#endif
268#ifndef	VSTATUS
269    termAytChar = CONTROL('T');
270#endif
271#endif	/* USE_TERMIO */
272}
273
274cc_t *
275tcval(int func)
276{
277    switch(func) {
278    case SLC_IP:	return(&termIntChar);
279    case SLC_ABORT:	return(&termQuitChar);
280    case SLC_EOF:	return(&termEofChar);
281    case SLC_EC:	return(&termEraseChar);
282    case SLC_EL:	return(&termKillChar);
283    case SLC_XON:	return(&termStartChar);
284    case SLC_XOFF:	return(&termStopChar);
285    case SLC_FORW1:	return(&termForw1Char);
286#ifdef	USE_TERMIO
287    case SLC_FORW2:	return(&termForw2Char);
288# ifdef	VDISCARD
289    case SLC_AO:	return(&termFlushChar);
290# endif
291# ifdef	VSUSP
292    case SLC_SUSP:	return(&termSuspChar);
293# endif
294# ifdef	VWERASE
295    case SLC_EW:	return(&termWerasChar);
296# endif
297# ifdef	VREPRINT
298    case SLC_RP:	return(&termRprntChar);
299# endif
300# ifdef	VLNEXT
301    case SLC_LNEXT:	return(&termLiteralNextChar);
302# endif
303# ifdef	VSTATUS
304    case SLC_AYT:	return(&termAytChar);
305# endif
306#endif
307
308    case SLC_SYNCH:
309    case SLC_BRK:
310    case SLC_EOR:
311    default:
312	return((cc_t *)0);
313    }
314}
315
316void
317TerminalDefaultChars(void)
318{
319#ifndef	USE_TERMIO
320    ntc = otc;
321    nltc = oltc;
322    nttyb.sg_kill = ottyb.sg_kill;
323    nttyb.sg_erase = ottyb.sg_erase;
324#else	/* USE_TERMIO */
325    memcpy(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc));
326# ifndef	VDISCARD
327    termFlushChar = CONTROL('O');
328# endif
329# ifndef	VWERASE
330    termWerasChar = CONTROL('W');
331# endif
332# ifndef	VREPRINT
333    termRprntChar = CONTROL('R');
334# endif
335# ifndef	VLNEXT
336    termLiteralNextChar = CONTROL('V');
337# endif
338# ifndef	VSTART
339    termStartChar = CONTROL('Q');
340# endif
341# ifndef	VSTOP
342    termStopChar = CONTROL('S');
343# endif
344# ifndef	VSTATUS
345    termAytChar = CONTROL('T');
346# endif
347#endif	/* USE_TERMIO */
348}
349
350/*
351 * TerminalNewMode - set up terminal to a specific mode.
352 *	MODE_ECHO: do local terminal echo
353 *	MODE_FLOW: do local flow control
354 *	MODE_TRAPSIG: do local mapping to TELNET IAC sequences
355 *	MODE_EDIT: do local line editing
356 *
357 *	Command mode:
358 *		MODE_ECHO|MODE_EDIT|MODE_FLOW|MODE_TRAPSIG
359 *		local echo
360 *		local editing
361 *		local xon/xoff
362 *		local signal mapping
363 *
364 *	Linemode:
365 *		local/no editing
366 *	Both Linemode and Single Character mode:
367 *		local/remote echo
368 *		local/no xon/xoff
369 *		local/no signal mapping
370 */
371
372void
373TerminalNewMode(int f)
374{
375    static int prevmode = 0;
376#ifndef	USE_TERMIO
377    struct tchars tc;
378    struct ltchars ltc;
379    struct sgttyb sb;
380    int lmode;
381#else	/* USE_TERMIO */
382    struct termio tmp_tc;
383#endif	/* USE_TERMIO */
384    int onoff;
385    int old;
386    cc_t esc;
387
388    globalmode = f&~MODE_FORCE;
389    if (prevmode == f)
390	return;
391
392    /*
393     * Write any outstanding data before switching modes
394     * ttyflush() returns 0 only when there is no more data
395     * left to write out, it returns -1 if it couldn't do
396     * anything at all, otherwise it returns 1 + the number
397     * of characters left to write.
398#ifndef	USE_TERMIO
399     * We would really like ask the kernel to wait for the output
400     * to drain, like we can do with the TCSADRAIN, but we don't have
401     * that option.  The only ioctl that waits for the output to
402     * drain, TIOCSETP, also flushes the input queue, which is NOT
403     * what we want (TIOCSETP is like TCSADFLUSH).
404#endif
405     */
406    old = ttyflush(SYNCHing|flushout);
407    if (old < 0 || old > 1) {
408#ifdef	USE_TERMIO
409	tcgetattr(tin, &tmp_tc);
410#endif	/* USE_TERMIO */
411	do {
412	    /*
413	     * Wait for data to drain, then flush again.
414	     */
415#ifdef	USE_TERMIO
416	    tcsetattr(tin, TCSADRAIN, &tmp_tc);
417#endif	/* USE_TERMIO */
418	    old = ttyflush(SYNCHing|flushout);
419	} while (old < 0 || old > 1);
420    }
421
422    old = prevmode;
423    prevmode = f&~MODE_FORCE;
424#ifndef	USE_TERMIO
425    sb = nttyb;
426    tc = ntc;
427    ltc = nltc;
428    lmode = olmode;
429#else
430    tmp_tc = new_tc;
431#endif
432
433    if (f&MODE_ECHO) {
434#ifndef	USE_TERMIO
435	sb.sg_flags |= ECHO;
436#else
437	tmp_tc.c_lflag |= ECHO;
438	tmp_tc.c_oflag |= ONLCR;
439	if (crlf)
440		tmp_tc.c_iflag |= ICRNL;
441#endif
442    } else {
443#ifndef	USE_TERMIO
444	sb.sg_flags &= ~ECHO;
445#else
446	tmp_tc.c_lflag &= ~ECHO;
447	tmp_tc.c_oflag &= ~ONLCR;
448#endif
449    }
450
451    if ((f&MODE_FLOW) == 0) {
452#ifndef	USE_TERMIO
453	tc.t_startc = _POSIX_VDISABLE;
454	tc.t_stopc = _POSIX_VDISABLE;
455#else
456	tmp_tc.c_iflag &= ~(IXOFF|IXON);	/* Leave the IXANY bit alone */
457    } else {
458	if (restartany < 0) {
459		tmp_tc.c_iflag |= IXOFF|IXON;	/* Leave the IXANY bit alone */
460	} else if (restartany > 0) {
461		tmp_tc.c_iflag |= IXOFF|IXON|IXANY;
462	} else {
463		tmp_tc.c_iflag |= IXOFF|IXON;
464		tmp_tc.c_iflag &= ~IXANY;
465	}
466#endif
467    }
468
469    if ((f&MODE_TRAPSIG) == 0) {
470#ifndef	USE_TERMIO
471	tc.t_intrc = _POSIX_VDISABLE;
472	tc.t_quitc = _POSIX_VDISABLE;
473	tc.t_eofc = _POSIX_VDISABLE;
474	ltc.t_suspc = _POSIX_VDISABLE;
475	ltc.t_dsuspc = _POSIX_VDISABLE;
476#else
477	tmp_tc.c_lflag &= ~ISIG;
478#endif
479	localchars = 0;
480    } else {
481#ifdef	USE_TERMIO
482	tmp_tc.c_lflag |= ISIG;
483#endif
484	localchars = 1;
485    }
486
487    if (f&MODE_EDIT) {
488#ifndef	USE_TERMIO
489	sb.sg_flags &= ~CBREAK;
490	sb.sg_flags |= CRMOD;
491#else
492	tmp_tc.c_lflag |= ICANON;
493#endif
494    } else {
495#ifndef	USE_TERMIO
496	sb.sg_flags |= CBREAK;
497	if (f&MODE_ECHO)
498	    sb.sg_flags |= CRMOD;
499	else
500	    sb.sg_flags &= ~CRMOD;
501#else
502	tmp_tc.c_lflag &= ~ICANON;
503	tmp_tc.c_iflag &= ~ICRNL;
504	tmp_tc.c_cc[VMIN] = 1;
505	tmp_tc.c_cc[VTIME] = 0;
506#endif
507    }
508
509    if ((f&(MODE_EDIT|MODE_TRAPSIG)) == 0) {
510#ifndef	USE_TERMIO
511	ltc.t_lnextc = _POSIX_VDISABLE;
512#else
513# ifdef VLNEXT
514	tmp_tc.c_cc[VLNEXT] = (cc_t)(_POSIX_VDISABLE);
515# endif
516#endif
517    }
518
519    if (f&MODE_SOFT_TAB) {
520#ifndef USE_TERMIO
521	sb.sg_flags |= XTABS;
522#else
523# ifdef	OXTABS
524	tmp_tc.c_oflag |= OXTABS;
525# endif
526# ifdef	TABDLY
527	tmp_tc.c_oflag &= ~TABDLY;
528	tmp_tc.c_oflag |= TAB3;
529# endif
530#endif
531    } else {
532#ifndef USE_TERMIO
533	sb.sg_flags &= ~XTABS;
534#else
535# ifdef	OXTABS
536	tmp_tc.c_oflag &= ~OXTABS;
537# endif
538# ifdef	TABDLY
539	tmp_tc.c_oflag &= ~TABDLY;
540# endif
541#endif
542    }
543
544    if (f&MODE_LIT_ECHO) {
545#ifndef USE_TERMIO
546	lmode &= ~LCTLECH;
547#else
548# ifdef	ECHOCTL
549	tmp_tc.c_lflag &= ~ECHOCTL;
550# endif
551#endif
552    } else {
553#ifndef USE_TERMIO
554	lmode |= LCTLECH;
555#else
556# ifdef	ECHOCTL
557	tmp_tc.c_lflag |= ECHOCTL;
558# endif
559#endif
560    }
561
562    if (f == -1) {
563	onoff = 0;
564    } else {
565#ifndef	USE_TERMIO
566	if (f & MODE_OUTBIN)
567		lmode |= LLITOUT;
568	else
569		lmode &= ~LLITOUT;
570
571	if (f & MODE_INBIN)
572		lmode |= LPASS8;
573	else
574		lmode &= ~LPASS8;
575#else
576	if (f & MODE_INBIN)
577		tmp_tc.c_iflag &= ~ISTRIP;
578	else
579		tmp_tc.c_iflag |= ISTRIP;
580	if (f & MODE_OUTBIN) {
581		tmp_tc.c_cflag &= ~(CSIZE|PARENB);
582		tmp_tc.c_cflag |= CS8;
583		tmp_tc.c_oflag &= ~OPOST;
584	} else {
585		tmp_tc.c_cflag &= ~(CSIZE|PARENB);
586		tmp_tc.c_cflag |= old_tc.c_cflag & (CSIZE|PARENB);
587		tmp_tc.c_oflag |= OPOST;
588	}
589#endif
590	onoff = 1;
591    }
592
593    if (f != -1) {
594#ifdef  SIGINT
595	(void) signal(SIGINT, intr);
596#endif
597#ifdef  SIGQUIT
598	(void) signal(SIGQUIT, intr2);
599#endif
600#ifdef	SIGTSTP
601	(void) signal(SIGTSTP, susp);
602#endif	/* SIGTSTP */
603#ifdef	SIGINFO
604	(void) signal(SIGINFO, ayt);
605#endif
606#if	defined(USE_TERMIO) && defined(NOKERNINFO)
607	tmp_tc.c_lflag |= NOKERNINFO;
608#endif
609	/*
610	 * We don't want to process ^Y here.  It's just another
611	 * character that we'll pass on to the back end.  It has
612	 * to process it because it will be processed when the
613	 * user attempts to read it, not when we send it.
614	 */
615#ifndef	USE_TERMIO
616	ltc.t_dsuspc = _POSIX_VDISABLE;
617#else
618# ifdef	VDSUSP
619	tmp_tc.c_cc[VDSUSP] = (cc_t)(_POSIX_VDISABLE);
620# endif
621#endif
622#ifdef	USE_TERMIO
623	/*
624	 * If the VEOL character is already set, then use VEOL2,
625	 * otherwise use VEOL.
626	 */
627	esc = (rlogin != _POSIX_VDISABLE) ? rlogin : escape;
628	if ((tmp_tc.c_cc[VEOL] != esc)
629# ifdef	VEOL2
630	    && (tmp_tc.c_cc[VEOL2] != esc)
631# endif
632	    ) {
633		if (tmp_tc.c_cc[VEOL] == (cc_t)(_POSIX_VDISABLE))
634		    tmp_tc.c_cc[VEOL] = esc;
635# ifdef	VEOL2
636		else if (tmp_tc.c_cc[VEOL2] == (cc_t)(_POSIX_VDISABLE))
637		    tmp_tc.c_cc[VEOL2] = esc;
638# endif
639	}
640#else
641	if (tc.t_brkc == (cc_t)(_POSIX_VDISABLE))
642		tc.t_brkc = esc;
643#endif
644    } else {
645#ifdef	SIGINFO
646	(void) signal(SIGINFO, (void (*)(int))ayt_status);
647#endif
648#ifdef  SIGINT
649	(void) signal(SIGINT, SIG_DFL);
650#endif
651#ifdef  SIGQUIT
652	(void) signal(SIGQUIT, SIG_DFL);
653#endif
654#ifdef	SIGTSTP
655	(void) signal(SIGTSTP, SIG_DFL);
656# ifndef SOLARIS
657	(void) sigsetmask(sigblock(0) & ~(1<<(SIGTSTP-1)));
658# else	/* SOLARIS */
659	(void) sigrelse(SIGTSTP);
660# endif	/* SOLARIS */
661#endif	/* SIGTSTP */
662#ifndef USE_TERMIO
663	ltc = oltc;
664	tc = otc;
665	sb = ottyb;
666	lmode = olmode;
667#else
668	tmp_tc = old_tc;
669#endif
670    }
671#ifndef USE_TERMIO
672    ioctl(tin, TIOCLSET, (char *)&lmode);
673    ioctl(tin, TIOCSLTC, (char *)&ltc);
674    ioctl(tin, TIOCSETC, (char *)&tc);
675    ioctl(tin, TIOCSETN, (char *)&sb);
676#else
677    if (tcsetattr(tin, TCSADRAIN, &tmp_tc) < 0)
678	tcsetattr(tin, TCSANOW, &tmp_tc);
679#endif
680
681    ioctl(tin, FIONBIO, (char *)&onoff);
682    ioctl(tout, FIONBIO, (char *)&onoff);
683
684}
685
686void
687TerminalSpeeds(long *ispeed, long *ospeed)
688{
689#ifdef	DECODE_BAUD
690    struct termspeeds *tp;
691#endif	/* DECODE_BAUD */
692    long in, out;
693
694    out = cfgetospeed(&old_tc);
695    in = cfgetispeed(&old_tc);
696    if (in == 0)
697	in = out;
698
699#ifdef	DECODE_BAUD
700    tp = termspeeds;
701    while ((tp->speed != -1) && (tp->value < in))
702	tp++;
703    *ispeed = tp->speed;
704
705    tp = termspeeds;
706    while ((tp->speed != -1) && (tp->value < out))
707	tp++;
708    *ospeed = tp->speed;
709#else	/* DECODE_BAUD */
710	*ispeed = in;
711	*ospeed = out;
712#endif	/* DECODE_BAUD */
713}
714
715int
716TerminalWindowSize(long *rows, long *cols)
717{
718#ifdef	TIOCGWINSZ
719    struct winsize ws;
720
721    if (ioctl(fileno(stdin), TIOCGWINSZ, (char *)&ws) >= 0) {
722	*rows = ws.ws_row;
723	*cols = ws.ws_col;
724	return 1;
725    }
726#endif	/* TIOCGWINSZ */
727    return 0;
728}
729
730int
731NetClose(int fd)
732{
733    return close(fd);
734}
735
736static void
737NetNonblockingIO(int fd, int onoff)
738{
739    ioctl(fd, FIONBIO, (char *)&onoff);
740}
741
742
743/*
744 * Various signal handling routines.
745 */
746
747/* ARGSUSED */
748SIG_FUNC_RET
749intr(int sig __unused)
750{
751    if (localchars) {
752	intp();
753	return;
754    }
755    setcommandmode();
756    longjmp(toplevel, -1);
757}
758
759/* ARGSUSED */
760SIG_FUNC_RET
761intr2(int sig __unused)
762{
763    if (localchars) {
764#ifdef	KLUDGELINEMODE
765	if (kludgelinemode)
766	    sendbrk();
767	else
768#endif
769	    sendabort();
770	return;
771    }
772}
773
774#ifdef	SIGTSTP
775/* ARGSUSED */
776SIG_FUNC_RET
777susp(int sig __unused)
778{
779    if ((rlogin != _POSIX_VDISABLE) && rlogin_susp())
780	return;
781    if (localchars)
782	sendsusp();
783}
784#endif
785
786#ifdef	SIGWINCH
787/* ARGSUSED */
788static SIG_FUNC_RET
789sendwin(int sig __unused)
790{
791    if (connected) {
792	sendnaws();
793    }
794}
795#endif
796
797#ifdef	SIGINFO
798/* ARGSUSED */
799SIG_FUNC_RET
800ayt(int sig __unused)
801{
802    if (connected)
803	sendayt();
804    else
805	ayt_status();
806}
807#endif
808
809
810void
811sys_telnet_init(void)
812{
813    (void) signal(SIGINT, intr);
814    (void) signal(SIGQUIT, intr2);
815    (void) signal(SIGPIPE, SIG_IGN);
816#ifdef	SIGWINCH
817    (void) signal(SIGWINCH, sendwin);
818#endif
819#ifdef	SIGTSTP
820    (void) signal(SIGTSTP, susp);
821#endif
822#ifdef	SIGINFO
823    (void) signal(SIGINFO, ayt);
824#endif
825
826    setconnmode(0);
827
828    NetNonblockingIO(net, 1);
829
830#if	defined(SO_OOBINLINE)
831    if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -1) {
832	perror("SetSockOpt");
833    }
834#endif	/* defined(SO_OOBINLINE) */
835}
836
837/*
838 * Process rings -
839 *
840 *	This routine tries to fill up/empty our various rings.
841 *
842 *	The parameter specifies whether this is a poll operation,
843 *	or a block-until-something-happens operation.
844 *
845 *	The return value is 1 if something happened, 0 if not.
846 */
847
848int
849process_rings(int netin, int netout, int netex, int ttyin, int ttyout, int poll)
850{
851    int c;
852    int returnValue = 0;
853    static struct timeval TimeValue = { 0, 0 };
854    int maxfd = -1;
855    int tmp;
856
857    if ((netout || netin || netex) && net > maxfd)
858	maxfd = net;
859
860    if (ttyout && tout > maxfd)
861	maxfd = tout;
862    if (ttyin && tin > maxfd)
863	maxfd = tin;
864    tmp = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask);
865    if (tmp > fdsn) {
866	if (ibitsp)
867	    free(ibitsp);
868	if (obitsp)
869	    free(obitsp);
870	if (xbitsp)
871	    free(xbitsp);
872
873	fdsn = tmp;
874	if ((ibitsp = (fd_set *)malloc(fdsn)) == NULL)
875	    err(1, "malloc");
876	if ((obitsp = (fd_set *)malloc(fdsn)) == NULL)
877	    err(1, "malloc");
878	if ((xbitsp = (fd_set *)malloc(fdsn)) == NULL)
879	    err(1, "malloc");
880	memset(ibitsp, 0, fdsn);
881	memset(obitsp, 0, fdsn);
882	memset(xbitsp, 0, fdsn);
883    }
884
885    if (netout)
886	FD_SET(net, obitsp);
887    if (ttyout)
888	FD_SET(tout, obitsp);
889    if (ttyin)
890	FD_SET(tin, ibitsp);
891    if (netin)
892	FD_SET(net, ibitsp);
893    if (netex)
894	FD_SET(net, xbitsp);
895    if ((c = select(maxfd + 1, ibitsp, obitsp, xbitsp,
896	     (poll == 0)? (struct timeval *)0 : &TimeValue)) < 0) {
897	if (c == -1) {
898		    /*
899		     * we can get EINTR if we are in line mode,
900		     * and the user does an escape (TSTP), or
901		     * some other signal generator.
902		     */
903	    if (errno == EINTR) {
904		return 0;
905	    }
906		    /* I don't like this, does it ever happen? */
907	    printf("sleep(5) from telnet, after select: %s\r\n", strerror(errno));
908	    sleep(5);
909	}
910	return 0;
911    }
912
913    /*
914     * Any urgent data?
915     */
916    if (FD_ISSET(net, xbitsp)) {
917	FD_CLR(net, xbitsp);
918	SYNCHing = 1;
919	(void) ttyflush(1);	/* flush already enqueued data */
920    }
921
922    /*
923     * Something to read from the network...
924     */
925    if (FD_ISSET(net, ibitsp)) {
926	int canread;
927
928	FD_CLR(net, ibitsp);
929	canread = ring_empty_consecutive(&netiring);
930#if	!defined(SO_OOBINLINE)
931	    /*
932	     * In 4.2 (and some early 4.3) systems, the
933	     * OOB indication and data handling in the kernel
934	     * is such that if two separate TCP Urgent requests
935	     * come in, one byte of TCP data will be overlaid.
936	     * This is fatal for Telnet, but we try to live
937	     * with it.
938	     *
939	     * In addition, in 4.2 (and...), a special protocol
940	     * is needed to pick up the TCP Urgent data in
941	     * the correct sequence.
942	     *
943	     * What we do is:  if we think we are in urgent
944	     * mode, we look to see if we are "at the mark".
945	     * If we are, we do an OOB receive.  If we run
946	     * this twice, we will do the OOB receive twice,
947	     * but the second will fail, since the second
948	     * time we were "at the mark", but there wasn't
949	     * any data there (the kernel doesn't reset
950	     * "at the mark" until we do a normal read).
951	     * Once we've read the OOB data, we go ahead
952	     * and do normal reads.
953	     *
954	     * There is also another problem, which is that
955	     * since the OOB byte we read doesn't put us
956	     * out of OOB state, and since that byte is most
957	     * likely the TELNET DM (data mark), we would
958	     * stay in the TELNET SYNCH (SYNCHing) state.
959	     * So, clocks to the rescue.  If we've "just"
960	     * received a DM, then we test for the
961	     * presence of OOB data when the receive OOB
962	     * fails (and AFTER we did the normal mode read
963	     * to clear "at the mark").
964	     */
965	if (SYNCHing) {
966	    int atmark;
967	    static int bogus_oob = 0, first = 1;
968
969	    ioctl(net, SIOCATMARK, (char *)&atmark);
970	    if (atmark) {
971		c = recv(net, netiring.supply, canread, MSG_OOB);
972		if ((c == -1) && (errno == EINVAL)) {
973		    c = recv(net, netiring.supply, canread, 0);
974		    if (clocks.didnetreceive < clocks.gotDM) {
975			SYNCHing = stilloob(net);
976		    }
977		} else if (first && c > 0) {
978		    /*
979		     * Bogosity check.  Systems based on 4.2BSD
980		     * do not return an error if you do a second
981		     * recv(MSG_OOB).  So, we do one.  If it
982		     * succeeds and returns exactly the same
983		     * data, then assume that we are running
984		     * on a broken system and set the bogus_oob
985		     * flag.  (If the data was different, then
986		     * we probably got some valid new data, so
987		     * increment the count...)
988		     */
989		    int i;
990		    i = recv(net, netiring.supply + c, canread - c, MSG_OOB);
991		    if (i == c &&
992			memcmp(netiring.supply, netiring.supply + c, i) == 0) {
993			bogus_oob = 1;
994			first = 0;
995		    } else if (i < 0) {
996			bogus_oob = 0;
997			first = 0;
998		    } else
999			c += i;
1000		}
1001		if (bogus_oob && c > 0) {
1002		    int i;
1003		    /*
1004		     * Bogosity.  We have to do the read
1005		     * to clear the atmark to get out of
1006		     * an infinate loop.
1007		     */
1008		    i = read(net, netiring.supply + c, canread - c);
1009		    if (i > 0)
1010			c += i;
1011		}
1012	    } else {
1013		c = recv(net, netiring.supply, canread, 0);
1014	    }
1015	} else {
1016	    c = recv(net, netiring.supply, canread, 0);
1017	}
1018	settimer(didnetreceive);
1019#else	/* !defined(SO_OOBINLINE) */
1020	c = recv(net, (char *)netiring.supply, canread, 0);
1021#endif	/* !defined(SO_OOBINLINE) */
1022	if (c < 0 && errno == EWOULDBLOCK) {
1023	    c = 0;
1024	} else if (c <= 0) {
1025	    return -1;
1026	}
1027	if (netdata) {
1028	    Dump('<', netiring.supply, c);
1029	}
1030	if (c)
1031	    ring_supplied(&netiring, c);
1032	returnValue = 1;
1033    }
1034
1035    /*
1036     * Something to read from the tty...
1037     */
1038    if (FD_ISSET(tin, ibitsp)) {
1039	FD_CLR(tin, ibitsp);
1040	c = TerminalRead(ttyiring.supply, ring_empty_consecutive(&ttyiring));
1041	if (c < 0 && errno == EIO)
1042	    c = 0;
1043	if (c < 0 && errno == EWOULDBLOCK) {
1044	    c = 0;
1045	} else {
1046	    /* EOF detection for line mode!!!! */
1047	    if ((c == 0) && MODE_LOCAL_CHARS(globalmode) && isatty(tin)) {
1048			/* must be an EOF... */
1049		*ttyiring.supply = termEofChar;
1050		c = 1;
1051	    }
1052	    if (c <= 0) {
1053		return -1;
1054	    }
1055	    if (termdata) {
1056		Dump('<', ttyiring.supply, c);
1057	    }
1058	    ring_supplied(&ttyiring, c);
1059	}
1060	returnValue = 1;		/* did something useful */
1061    }
1062
1063    if (FD_ISSET(net, obitsp)) {
1064	FD_CLR(net, obitsp);
1065	returnValue |= netflush();
1066    }
1067    if (FD_ISSET(tout, obitsp)) {
1068	FD_CLR(tout, obitsp);
1069	returnValue |= (ttyflush(SYNCHing|flushout) > 0);
1070    }
1071
1072    return returnValue;
1073}
1074