subr.c revision 21673 
1/*
2 * Copyright (c) 1983, 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#ifndef lint
35/*static char sccsid[] = "from: @(#)subr.c	8.1 (Berkeley) 6/4/93";*/
36static char rcsid[] = "$FreeBSD: head/libexec/getty/subr.c 21673 1997-01-14 07:20:47Z jkh $";
37#endif /* not lint */
38
39/*
40 * Melbourne getty.
41 */
42#define COMPAT_43
43#include <stdlib.h>
44#include <unistd.h>
45#include <string.h>
46#include <termios.h>
47#include <sys/ioctl.h>
48#include <sys/param.h>
49#ifdef DEBUG
50#include <stdio.h>
51#endif
52
53#include "gettytab.h"
54#include "pathnames.h"
55#include "extern.h"
56
57
58#ifdef COMPAT_43
59static void	compatflags __P((long));
60#endif
61
62/*
63 * Get a table entry.
64 */
65void
66gettable(name, buf)
67	const char *name;
68	char *buf;
69{
70	register struct gettystrs *sp;
71	register struct gettynums *np;
72	register struct gettyflags *fp;
73	long n;
74	const char *dba[2];
75	dba[0] = _PATH_GETTYTAB;
76	dba[1] = 0;
77
78	if (cgetent(&buf, dba, name) != 0)
79		return;
80
81	for (sp = gettystrs; sp->field; sp++)
82		cgetstr(buf, sp->field, &sp->value);
83	for (np = gettynums; np->field; np++) {
84		if (cgetnum(buf, np->field, &n) == -1)
85			np->set = 0;
86		else {
87			np->set = 1;
88			np->value = n;
89		}
90	}
91	for (fp = gettyflags; fp->field; fp++) {
92		if (cgetcap(buf, fp->field, ':') == NULL)
93			fp->set = 0;
94		else {
95			fp->set = 1;
96			fp->value = 1 ^ fp->invrt;
97		}
98	}
99#ifdef DEBUG
100	printf("name=\"%s\", buf=\"%s\"\r\n", name, buf);
101	for (sp = gettystrs; sp->field; sp++)
102		printf("cgetstr: %s=%s\r\n", sp->field, sp->value);
103	for (np = gettynums; np->field; np++)
104		printf("cgetnum: %s=%d\r\n", np->field, np->value);
105	for (fp = gettyflags; fp->field; fp++)
106		printf("cgetflags: %s='%c' set='%c'\r\n", fp->field,
107		       fp->value + '0', fp->set + '0');
108#endif /* DEBUG */
109}
110
111void
112gendefaults()
113{
114	register struct gettystrs *sp;
115	register struct gettynums *np;
116	register struct gettyflags *fp;
117
118	for (sp = gettystrs; sp->field; sp++)
119		if (sp->value)
120			sp->defalt = sp->value;
121	for (np = gettynums; np->field; np++)
122		if (np->set)
123			np->defalt = np->value;
124	for (fp = gettyflags; fp->field; fp++)
125		if (fp->set)
126			fp->defalt = fp->value;
127		else
128			fp->defalt = fp->invrt;
129}
130
131void
132setdefaults()
133{
134	register struct gettystrs *sp;
135	register struct gettynums *np;
136	register struct gettyflags *fp;
137
138	for (sp = gettystrs; sp->field; sp++)
139		if (!sp->value)
140			sp->value = sp->defalt;
141	for (np = gettynums; np->field; np++)
142		if (!np->set)
143			np->value = np->defalt;
144	for (fp = gettyflags; fp->field; fp++)
145		if (!fp->set)
146			fp->value = fp->defalt;
147}
148
149static char **
150charnames[] = {
151	&ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
152	&SU, &DS, &RP, &FL, &WE, &LN, 0
153};
154
155static char *
156charvars[] = {
157	&tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
158	&tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
159	&tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
160	&tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
161	&tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
162};
163
164void
165setchars()
166{
167	register int i;
168	register const char *p;
169
170	for (i = 0; charnames[i]; i++) {
171		p = *charnames[i];
172		if (p && *p)
173			*charvars[i] = *p;
174		else
175			*charvars[i] = _POSIX_VDISABLE;
176	}
177}
178
179/* Macros to clear/set/test flags. */
180#define	SET(t, f)	(t) |= (f)
181#define	CLR(t, f)	(t) &= ~(f)
182#define	ISSET(t, f)	((t) & (f))
183
184void
185setflags(n)
186	int n;
187{
188	register tcflag_t iflag, oflag, cflag, lflag;
189
190#ifdef COMPAT_43
191	switch (n) {
192	case 0:
193		if (F0set) {
194			compatflags(F0);
195			return;
196		}
197		break;
198	case 1:
199		if (F1set) {
200			compatflags(F1);
201			return;
202		}
203		break;
204	default:
205		if (F2set) {
206			compatflags(F2);
207			return;
208		}
209		break;
210	}
211#endif
212
213	switch (n) {
214	case 0:
215		if (C0set && I0set && L0set && O0set) {
216			tmode.c_cflag = C0;
217			tmode.c_iflag = I0;
218			tmode.c_lflag = L0;
219			tmode.c_oflag = O0;
220			return;
221		}
222		break;
223	case 1:
224		if (C1set && I1set && L1set && O1set) {
225			tmode.c_cflag = C1;
226			tmode.c_iflag = I1;
227			tmode.c_lflag = L1;
228			tmode.c_oflag = O1;
229			return;
230		}
231		break;
232	default:
233		if (C2set && I2set && L2set && O2set) {
234			tmode.c_cflag = C2;
235			tmode.c_iflag = I2;
236			tmode.c_lflag = L2;
237			tmode.c_oflag = O2;
238			return;
239		}
240		break;
241	}
242
243	iflag = omode.c_iflag;
244	oflag = omode.c_oflag;
245	cflag = omode.c_cflag;
246	lflag = omode.c_lflag;
247
248	if (NP) {
249		CLR(cflag, CSIZE|PARENB);
250		SET(cflag, CS8);
251		CLR(iflag, ISTRIP|INPCK|IGNPAR);
252	} else if (AP || EP || OP) {
253		CLR(cflag, CSIZE);
254		SET(cflag, CS7|PARENB);
255		SET(iflag, ISTRIP);
256		if (OP && !EP) {
257			SET(iflag, INPCK|IGNPAR);
258			SET(cflag, PARODD);
259			if (AP)
260				CLR(iflag, INPCK);
261		} else if (EP && !OP) {
262			SET(iflag, INPCK|IGNPAR);
263			CLR(cflag, PARODD);
264			if (AP)
265				CLR(iflag, INPCK);
266		} else if (AP || (EP && OP)) {
267			CLR(iflag, INPCK|IGNPAR);
268			CLR(cflag, PARODD);
269		}
270	} /* else, leave as is */
271
272#if 0
273	if (UC)
274		f |= LCASE;
275#endif
276
277	if (HC)
278		SET(cflag, HUPCL);
279	else
280		CLR(cflag, HUPCL);
281
282	if (MB)
283		SET(cflag, MDMBUF);
284	else
285		CLR(cflag, MDMBUF);
286
287	if (NL) {
288		SET(iflag, ICRNL);
289		SET(oflag, ONLCR|OPOST);
290	} else {
291		CLR(iflag, ICRNL);
292		CLR(oflag, ONLCR);
293	}
294
295	if (!HT)
296		SET(oflag, OXTABS|OPOST);
297	else
298		CLR(oflag, OXTABS);
299
300#ifdef XXX_DELAY
301	SET(f, delaybits());
302#endif
303
304	if (n == 1) {		/* read mode flags */
305		if (RW) {
306			iflag = 0;
307			CLR(oflag, OPOST);
308			CLR(cflag, CSIZE|PARENB);
309			SET(cflag, CS8);
310			lflag = 0;
311		} else {
312			CLR(lflag, ICANON);
313		}
314		goto out;
315	}
316
317	if (n == 0)
318		goto out;
319
320#if 0
321	if (CB)
322		SET(f, CRTBS);
323#endif
324
325	if (CE)
326		SET(lflag, ECHOE);
327	else
328		CLR(lflag, ECHOE);
329
330	if (CK)
331		SET(lflag, ECHOKE);
332	else
333		CLR(lflag, ECHOKE);
334
335	if (PE)
336		SET(lflag, ECHOPRT);
337	else
338		CLR(lflag, ECHOPRT);
339
340	if (EC)
341		SET(lflag, ECHO);
342	else
343		CLR(lflag, ECHO);
344
345	if (XC)
346		SET(lflag, ECHOCTL);
347	else
348		CLR(lflag, ECHOCTL);
349
350	if (DX)
351		SET(lflag, IXANY);
352	else
353		CLR(lflag, IXANY);
354
355out:
356	tmode.c_iflag = iflag;
357	tmode.c_oflag = oflag;
358	tmode.c_cflag = cflag;
359	tmode.c_lflag = lflag;
360}
361
362#ifdef COMPAT_43
363/*
364 * Old TTY => termios, snatched from <sys/kern/tty_compat.c>
365 */
366void
367compatflags(flags)
368register long flags;
369{
370	register tcflag_t iflag, oflag, cflag, lflag;
371
372	iflag = BRKINT|ICRNL|IMAXBEL|IXON|IXANY;
373	oflag = OPOST|ONLCR|OXTABS;
374	cflag = CREAD;
375	lflag = ICANON|ISIG|IEXTEN;
376
377	if (ISSET(flags, TANDEM))
378		SET(iflag, IXOFF);
379	else
380		CLR(iflag, IXOFF);
381	if (ISSET(flags, ECHO))
382		SET(lflag, ECHO);
383	else
384		CLR(lflag, ECHO);
385	if (ISSET(flags, CRMOD)) {
386		SET(iflag, ICRNL);
387		SET(oflag, ONLCR);
388	} else {
389		CLR(iflag, ICRNL);
390		CLR(oflag, ONLCR);
391	}
392	if (ISSET(flags, XTABS))
393		SET(oflag, OXTABS);
394	else
395		CLR(oflag, OXTABS);
396
397
398	if (ISSET(flags, RAW)) {
399		iflag &= IXOFF;
400		CLR(lflag, ISIG|ICANON|IEXTEN);
401		CLR(cflag, PARENB);
402	} else {
403		SET(iflag, BRKINT|IXON|IMAXBEL);
404		SET(lflag, ISIG|IEXTEN);
405		if (ISSET(flags, CBREAK))
406			CLR(lflag, ICANON);
407		else
408			SET(lflag, ICANON);
409		switch (ISSET(flags, ANYP)) {
410		case 0:
411			CLR(cflag, PARENB);
412			break;
413		case ANYP:
414			SET(cflag, PARENB);
415			CLR(iflag, INPCK);
416			break;
417		case EVENP:
418			SET(cflag, PARENB);
419			SET(iflag, INPCK);
420			CLR(cflag, PARODD);
421			break;
422		case ODDP:
423			SET(cflag, PARENB);
424			SET(iflag, INPCK);
425			SET(cflag, PARODD);
426			break;
427		}
428	}
429
430	/* Nothing we can do with CRTBS. */
431	if (ISSET(flags, PRTERA))
432		SET(lflag, ECHOPRT);
433	else
434		CLR(lflag, ECHOPRT);
435	if (ISSET(flags, CRTERA))
436		SET(lflag, ECHOE);
437	else
438		CLR(lflag, ECHOE);
439	/* Nothing we can do with TILDE. */
440	if (ISSET(flags, MDMBUF))
441		SET(cflag, MDMBUF);
442	else
443		CLR(cflag, MDMBUF);
444	if (ISSET(flags, NOHANG))
445		CLR(cflag, HUPCL);
446	else
447		SET(cflag, HUPCL);
448	if (ISSET(flags, CRTKIL))
449		SET(lflag, ECHOKE);
450	else
451		CLR(lflag, ECHOKE);
452	if (ISSET(flags, CTLECH))
453		SET(lflag, ECHOCTL);
454	else
455		CLR(lflag, ECHOCTL);
456	if (!ISSET(flags, DECCTQ))
457		SET(iflag, IXANY);
458	else
459		CLR(iflag, IXANY);
460	CLR(lflag, TOSTOP|FLUSHO|PENDIN|NOFLSH);
461	SET(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));
462
463	if (ISSET(flags, RAW|LITOUT|PASS8)) {
464		CLR(cflag, CSIZE);
465		SET(cflag, CS8);
466		if (!ISSET(flags, RAW|PASS8))
467			SET(iflag, ISTRIP);
468		else
469			CLR(iflag, ISTRIP);
470		if (!ISSET(flags, RAW|LITOUT))
471			SET(oflag, OPOST);
472		else
473			CLR(oflag, OPOST);
474	} else {
475		CLR(cflag, CSIZE);
476		SET(cflag, CS7);
477		SET(iflag, ISTRIP);
478		SET(oflag, OPOST);
479	}
480
481	tmode.c_iflag = iflag;
482	tmode.c_oflag = oflag;
483	tmode.c_cflag = cflag;
484	tmode.c_lflag = lflag;
485}
486#endif
487
488#ifdef XXX_DELAY
489struct delayval {
490	unsigned	delay;		/* delay in ms */
491	int		bits;
492};
493
494/*
495 * below are random guesses, I can't be bothered checking
496 */
497
498struct delayval	crdelay[] = {
499	{ 1,		CR1 },
500	{ 2,		CR2 },
501	{ 3,		CR3 },
502	{ 83,		CR1 },
503	{ 166,		CR2 },
504	{ 0,		CR3 },
505};
506
507struct delayval nldelay[] = {
508	{ 1,		NL1 },		/* special, calculated */
509	{ 2,		NL2 },
510	{ 3,		NL3 },
511	{ 100,		NL2 },
512	{ 0,		NL3 },
513};
514
515struct delayval	bsdelay[] = {
516	{ 1,		BS1 },
517	{ 0,		0 },
518};
519
520struct delayval	ffdelay[] = {
521	{ 1,		FF1 },
522	{ 1750,		FF1 },
523	{ 0,		FF1 },
524};
525
526struct delayval	tbdelay[] = {
527	{ 1,		TAB1 },
528	{ 2,		TAB2 },
529	{ 3,		XTABS },	/* this is expand tabs */
530	{ 100,		TAB1 },
531	{ 0,		TAB2 },
532};
533
534int
535delaybits()
536{
537	register int f;
538
539	f  = adelay(CD, crdelay);
540	f |= adelay(ND, nldelay);
541	f |= adelay(FD, ffdelay);
542	f |= adelay(TD, tbdelay);
543	f |= adelay(BD, bsdelay);
544	return (f);
545}
546
547int
548adelay(ms, dp)
549	register ms;
550	register struct delayval *dp;
551{
552	if (ms == 0)
553		return (0);
554	while (dp->delay && ms > dp->delay)
555		dp++;
556	return (dp->bits);
557}
558#endif
559
560char	editedhost[MAXHOSTNAMELEN];
561
562void
563edithost(pat)
564	register const char *pat;
565{
566	register const char *host = HN;
567	register char *res = editedhost;
568
569	if (!pat)
570		pat = "";
571	while (*pat) {
572		switch (*pat) {
573
574		case '#':
575			if (*host)
576				host++;
577			break;
578
579		case '@':
580			if (*host)
581				*res++ = *host++;
582			break;
583
584		default:
585			*res++ = *pat;
586			break;
587
588		}
589		if (res == &editedhost[sizeof editedhost - 1]) {
590			*res = '\0';
591			return;
592		}
593		pat++;
594	}
595	if (*host)
596		strncpy(res, host, sizeof editedhost - (res - editedhost) - 1);
597	else
598		*res = '\0';
599	editedhost[sizeof editedhost - 1] = '\0';
600}
601
602static struct speedtab {
603	int	speed;
604	int	uxname;
605} speedtab[] = {
606	{ 50,	B50 },
607	{ 75,	B75 },
608	{ 110,	B110 },
609	{ 134,	B134 },
610	{ 150,	B150 },
611	{ 200,	B200 },
612	{ 300,	B300 },
613	{ 600,	B600 },
614	{ 1200,	B1200 },
615	{ 1800,	B1800 },
616	{ 2400,	B2400 },
617	{ 4800,	B4800 },
618	{ 9600,	B9600 },
619	{ 19200, EXTA },
620	{ 19,	EXTA },		/* for people who say 19.2K */
621	{ 38400, EXTB },
622	{ 38,	EXTB },
623	{ 7200,	EXTB },		/* alternative */
624	{ 57600, B57600 },
625	{ 115200, B115200 },
626	{ 0 }
627};
628
629int
630speed(val)
631	int val;
632{
633	register struct speedtab *sp;
634
635	if (val <= B115200)
636		return (val);
637
638	for (sp = speedtab; sp->speed; sp++)
639		if (sp->speed == val)
640			return (sp->uxname);
641
642	return (B300);		/* default in impossible cases */
643}
644
645void
646makeenv(env)
647	char *env[];
648{
649	static char termbuf[128] = "TERM=";
650	register char *p, *q;
651	register char **ep;
652
653	ep = env;
654	if (TT && *TT) {
655		strcat(termbuf, TT);
656		*ep++ = termbuf;
657	}
658	if ((p = EV)) {
659		q = p;
660		while ((q = strchr(q, ','))) {
661			*q++ = '\0';
662			*ep++ = p;
663			p = q;
664		}
665		if (*p)
666			*ep++ = p;
667	}
668	*ep = (char *)0;
669}
670
671/*
672 * This speed select mechanism is written for the Develcon DATASWITCH.
673 * The Develcon sends a string of the form "B{speed}\n" at a predefined
674 * baud rate. This string indicates the user's actual speed.
675 * The routine below returns the terminal type mapped from derived speed.
676 */
677struct	portselect {
678	const char	*ps_baud;
679	const char	*ps_type;
680} portspeeds[] = {
681	{ "B110",	"std.110" },
682	{ "B134",	"std.134" },
683	{ "B150",	"std.150" },
684	{ "B300",	"std.300" },
685	{ "B600",	"std.600" },
686	{ "B1200",	"std.1200" },
687	{ "B2400",	"std.2400" },
688	{ "B4800",	"std.4800" },
689	{ "B9600",	"std.9600" },
690	{ "B19200",	"std.19200" },
691	{ 0 }
692};
693
694const char *
695portselector()
696{
697	char c, baud[20];
698	const char *type = "default";
699	register struct portselect *ps;
700	int len;
701
702	alarm(5*60);
703	for (len = 0; len < sizeof (baud) - 1; len++) {
704		if (read(STDIN_FILENO, &c, 1) <= 0)
705			break;
706		c &= 0177;
707		if (c == '\n' || c == '\r')
708			break;
709		if (c == 'B')
710			len = 0;	/* in case of leading garbage */
711		baud[len] = c;
712	}
713	baud[len] = '\0';
714	for (ps = portspeeds; ps->ps_baud; ps++)
715		if (strcmp(ps->ps_baud, baud) == 0) {
716			type = ps->ps_type;
717			break;
718		}
719	sleep(2);	/* wait for connection to complete */
720	return (type);
721}
722
723/*
724 * This auto-baud speed select mechanism is written for the Micom 600
725 * portselector. Selection is done by looking at how the character '\r'
726 * is garbled at the different speeds.
727 */
728#include <sys/time.h>
729
730const char *
731autobaud()
732{
733	int rfds;
734	struct timeval timeout;
735	char c;
736	const char *type = "9600-baud";
737
738	(void)tcflush(0, TCIOFLUSH);
739	rfds = 1 << 0;
740	timeout.tv_sec = 5;
741	timeout.tv_usec = 0;
742	if (select(32, (fd_set *)&rfds, (fd_set *)NULL,
743	    (fd_set *)NULL, &timeout) <= 0)
744		return (type);
745	if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
746		return (type);
747	timeout.tv_sec = 0;
748	timeout.tv_usec = 20;
749	(void) select(32, (fd_set *)NULL, (fd_set *)NULL,
750	    (fd_set *)NULL, &timeout);
751	(void)tcflush(0, TCIOFLUSH);
752	switch (c & 0377) {
753
754	case 0200:		/* 300-baud */
755		type = "300-baud";
756		break;
757
758	case 0346:		/* 1200-baud */
759		type = "1200-baud";
760		break;
761
762	case  015:		/* 2400-baud */
763	case 0215:
764		type = "2400-baud";
765		break;
766
767	default:		/* 4800-baud */
768		type = "4800-baud";
769		break;
770
771	case 0377:		/* 9600-baud */
772		type = "9600-baud";
773		break;
774	}
775	return (type);
776}
777