1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Melbourne getty.
34 */
35 #include <sys/ioctl.h>
36 #include <sys/param.h>
37 #include <sys/time.h>
38
39 #include <poll.h>
40 #include <regex.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <syslog.h>
44 #include <termios.h>
45 #include <unistd.h>
46
47 #include "gettytab.h"
48 #include "pathnames.h"
49 #include "extern.h"
50
51 /*
52 * Get a table entry.
53 */
54 void
gettable(const char * name)55 gettable(const char *name)
56 {
57 char *buf = NULL;
58 struct gettystrs *sp;
59 struct gettynums *np;
60 struct gettyflags *fp;
61 long n;
62 int l;
63 char *p;
64 static char path_gettytab[PATH_MAX];
65 char *dba[2];
66
67 static int firsttime = 1;
68
69 strlcpy(path_gettytab, _PATH_GETTYTAB, sizeof(path_gettytab));
70 dba[0] = path_gettytab;
71 dba[1] = NULL;
72
73 if (firsttime) {
74 /*
75 * we need to strdup() anything in the strings array
76 * initially in order to simplify things later
77 */
78 for (sp = gettystrs; sp->field; sp++)
79 if (sp->value != NULL) {
80 /* handle these ones more carefully */
81 if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
82 l = 2;
83 else
84 l = strlen(sp->value) + 1;
85 if ((p = malloc(l)) != NULL)
86 strlcpy(p, sp->value, l);
87 /*
88 * replace, even if NULL, else we'll
89 * have problems with free()ing static mem
90 */
91 sp->value = p;
92 }
93 firsttime = 0;
94 }
95
96 switch (cgetent(&buf, dba, name)) {
97 case 1:
98 syslog(LOG_ERR, "getty: couldn't resolve 'tc=' in gettytab '%s'", name);
99 return;
100 case 0:
101 break;
102 case -1:
103 syslog(LOG_ERR, "getty: unknown gettytab entry '%s'", name);
104 return;
105 case -2:
106 syslog(LOG_ERR, "getty: retrieving gettytab entry '%s': %m", name);
107 return;
108 case -3:
109 syslog(LOG_ERR, "getty: recursive 'tc=' reference gettytab entry '%s'", name);
110 return;
111 default:
112 syslog(LOG_ERR, "getty: unexpected cgetent() error for entry '%s'", name);
113 return;
114 }
115
116 for (sp = gettystrs; sp->field; sp++) {
117 if ((l = cgetstr(buf, sp->field, &p)) >= 0) {
118 if (sp->value) {
119 /* prefer existing value */
120 if (strcmp(p, sp->value) != 0)
121 free(sp->value);
122 else {
123 free(p);
124 p = sp->value;
125 }
126 }
127 sp->value = p;
128 } else if (l == -1) {
129 free(sp->value);
130 sp->value = NULL;
131 }
132 }
133
134 for (np = gettynums; np->field; np++) {
135 if (cgetnum(buf, np->field, &n) == -1)
136 np->set = 0;
137 else {
138 np->set = 1;
139 np->value = n;
140 }
141 }
142
143 for (fp = gettyflags; fp->field; fp++) {
144 if (cgetcap(buf, fp->field, ':') == NULL)
145 fp->set = 0;
146 else {
147 fp->set = 1;
148 fp->value = 1 ^ fp->invrt;
149 }
150 }
151 free(buf);
152 }
153
154 void
gendefaults(void)155 gendefaults(void)
156 {
157 struct gettystrs *sp;
158 struct gettynums *np;
159 struct gettyflags *fp;
160
161 for (sp = gettystrs; sp->field; sp++)
162 if (sp->value)
163 sp->defalt = strdup(sp->value);
164 for (np = gettynums; np->field; np++)
165 if (np->set)
166 np->defalt = np->value;
167 for (fp = gettyflags; fp->field; fp++)
168 if (fp->set)
169 fp->defalt = fp->value;
170 else
171 fp->defalt = fp->invrt;
172 }
173
174 void
setdefaults(void)175 setdefaults(void)
176 {
177 struct gettystrs *sp;
178 struct gettynums *np;
179 struct gettyflags *fp;
180
181 for (sp = gettystrs; sp->field; sp++)
182 if (!sp->value)
183 sp->value = !sp->defalt ?
184 sp->defalt : strdup(sp->defalt);
185 for (np = gettynums; np->field; np++)
186 if (!np->set)
187 np->value = np->defalt;
188 for (fp = gettyflags; fp->field; fp++)
189 if (!fp->set)
190 fp->value = fp->defalt;
191 }
192
193 static char **
194 charnames[] = {
195 &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
196 &SU, &DS, &RP, &FL, &WE, &LN, 0
197 };
198
199 #define CV(a) (char *)(&tmode.c_cc[a])
200
201 static char *
202 charvars[] = {
203 CV(VERASE), CV(VKILL), CV(VINTR),
204 CV(VQUIT), CV(VSTART), CV(VSTOP),
205 CV(VEOF), CV(VEOL), CV(VSUSP),
206 CV(VDSUSP), CV(VREPRINT), CV(VDISCARD),
207 CV(VWERASE), CV(VLNEXT), 0
208 };
209
210 void
setchars(void)211 setchars(void)
212 {
213 int i;
214 const char *p;
215
216 for (i = 0; charnames[i]; i++) {
217 p = *charnames[i];
218 if (p && *p)
219 *charvars[i] = *p;
220 else
221 *charvars[i] = _POSIX_VDISABLE;
222 }
223 }
224
225 /* Macros to clear/set/test flags. */
226 #define SET(t, f) (t) |= (f)
227 #define CLR(t, f) (t) &= ~(f)
228 #define ISSET(t, f) ((t) & (f))
229
230 void
set_flags(int n)231 set_flags(int n)
232 {
233 tcflag_t iflag, oflag, cflag, lflag;
234
235
236 switch (n) {
237 case 0:
238 if (C0set && I0set && L0set && O0set) {
239 tmode.c_cflag = C0;
240 tmode.c_iflag = I0;
241 tmode.c_lflag = L0;
242 tmode.c_oflag = O0;
243 return;
244 }
245 break;
246 case 1:
247 if (C1set && I1set && L1set && O1set) {
248 tmode.c_cflag = C1;
249 tmode.c_iflag = I1;
250 tmode.c_lflag = L1;
251 tmode.c_oflag = O1;
252 return;
253 }
254 break;
255 default:
256 if (C2set && I2set && L2set && O2set) {
257 tmode.c_cflag = C2;
258 tmode.c_iflag = I2;
259 tmode.c_lflag = L2;
260 tmode.c_oflag = O2;
261 return;
262 }
263 break;
264 }
265
266 iflag = omode.c_iflag;
267 oflag = omode.c_oflag;
268 cflag = omode.c_cflag;
269 lflag = omode.c_lflag;
270
271 if (NP) {
272 CLR(cflag, CSIZE|PARENB);
273 SET(cflag, CS8);
274 CLR(iflag, ISTRIP|INPCK|IGNPAR);
275 } else if (AP || EP || OP) {
276 CLR(cflag, CSIZE);
277 SET(cflag, CS7|PARENB);
278 SET(iflag, ISTRIP);
279 if (OP && !EP) {
280 SET(iflag, INPCK|IGNPAR);
281 SET(cflag, PARODD);
282 if (AP)
283 CLR(iflag, INPCK);
284 } else if (EP && !OP) {
285 SET(iflag, INPCK|IGNPAR);
286 CLR(cflag, PARODD);
287 if (AP)
288 CLR(iflag, INPCK);
289 } else if (AP || (EP && OP)) {
290 CLR(iflag, INPCK|IGNPAR);
291 CLR(cflag, PARODD);
292 }
293 } /* else, leave as is */
294
295 #if 0
296 if (UC)
297 f |= LCASE;
298 #endif
299
300 if (HC)
301 SET(cflag, HUPCL);
302 else
303 CLR(cflag, HUPCL);
304
305 if (MB)
306 SET(cflag, MDMBUF);
307 else
308 CLR(cflag, MDMBUF);
309
310 if (HW)
311 SET(cflag, CRTSCTS);
312 else
313 CLR(cflag, CRTSCTS);
314
315 if (NL) {
316 SET(iflag, ICRNL);
317 SET(oflag, ONLCR|OPOST);
318 } else {
319 CLR(iflag, ICRNL);
320 CLR(oflag, ONLCR);
321 }
322
323 if (!HT)
324 SET(oflag, OXTABS|OPOST);
325 else
326 CLR(oflag, OXTABS);
327
328 #ifdef XXX_DELAY
329 SET(f, delaybits());
330 #endif
331
332 if (n == 1) { /* read mode flags */
333 if (RW) {
334 iflag = 0;
335 CLR(oflag, OPOST);
336 CLR(cflag, CSIZE|PARENB);
337 SET(cflag, CS8);
338 lflag = 0;
339 } else {
340 CLR(lflag, ICANON);
341 }
342 goto out;
343 }
344
345 if (n == 0)
346 goto out;
347
348 #if 0
349 if (CB)
350 SET(f, CRTBS);
351 #endif
352
353 if (CE)
354 SET(lflag, ECHOE);
355 else
356 CLR(lflag, ECHOE);
357
358 if (CK)
359 SET(lflag, ECHOKE);
360 else
361 CLR(lflag, ECHOKE);
362
363 if (PE)
364 SET(lflag, ECHOPRT);
365 else
366 CLR(lflag, ECHOPRT);
367
368 if (EC)
369 SET(lflag, ECHO);
370 else
371 CLR(lflag, ECHO);
372
373 if (XC)
374 SET(lflag, ECHOCTL);
375 else
376 CLR(lflag, ECHOCTL);
377
378 if (DX)
379 SET(lflag, IXANY);
380 else
381 CLR(lflag, IXANY);
382
383 out:
384 tmode.c_iflag = iflag;
385 tmode.c_oflag = oflag;
386 tmode.c_cflag = cflag;
387 tmode.c_lflag = lflag;
388 }
389
390
391 #ifdef XXX_DELAY
392 struct delayval {
393 unsigned delay; /* delay in ms */
394 int bits;
395 };
396
397 /*
398 * below are random guesses, I can't be bothered checking
399 */
400
401 struct delayval crdelay[] = {
402 { 1, CR1 },
403 { 2, CR2 },
404 { 3, CR3 },
405 { 83, CR1 },
406 { 166, CR2 },
407 { 0, CR3 },
408 };
409
410 struct delayval nldelay[] = {
411 { 1, NL1 }, /* special, calculated */
412 { 2, NL2 },
413 { 3, NL3 },
414 { 100, NL2 },
415 { 0, NL3 },
416 };
417
418 struct delayval bsdelay[] = {
419 { 1, BS1 },
420 { 0, 0 },
421 };
422
423 struct delayval ffdelay[] = {
424 { 1, FF1 },
425 { 1750, FF1 },
426 { 0, FF1 },
427 };
428
429 struct delayval tbdelay[] = {
430 { 1, TAB1 },
431 { 2, TAB2 },
432 { 3, XTABS }, /* this is expand tabs */
433 { 100, TAB1 },
434 { 0, TAB2 },
435 };
436
437 int
delaybits(void)438 delaybits(void)
439 {
440 int f;
441
442 f = adelay(CD, crdelay);
443 f |= adelay(ND, nldelay);
444 f |= adelay(FD, ffdelay);
445 f |= adelay(TD, tbdelay);
446 f |= adelay(BD, bsdelay);
447 return (f);
448 }
449
450 int
adelay(int ms,struct delayval * dp)451 adelay(int ms, struct delayval *dp)
452 {
453 if (ms == 0)
454 return (0);
455 while (dp->delay && ms > dp->delay)
456 dp++;
457 return (dp->bits);
458 }
459 #endif
460
461 char editedhost[MAXHOSTNAMELEN];
462
463 void
edithost(const char * pattern)464 edithost(const char *pattern)
465 {
466 regex_t regex;
467 regmatch_t *match;
468 int found;
469
470 if (pattern == NULL || *pattern == '\0')
471 goto copyasis;
472 if (regcomp(®ex, pattern, REG_EXTENDED) != 0)
473 goto copyasis;
474
475 match = calloc(regex.re_nsub + 1, sizeof(*match));
476 if (match == NULL) {
477 regfree(®ex);
478 goto copyasis;
479 }
480
481 found = !regexec(®ex, HN, regex.re_nsub + 1, match, 0);
482 if (found) {
483 size_t subex, totalsize;
484
485 /*
486 * We found a match. If there were no parenthesized
487 * subexpressions in the pattern, use entire matched
488 * string as ``editedhost''; otherwise use the first
489 * matched subexpression.
490 */
491 subex = !!regex.re_nsub;
492 totalsize = match[subex].rm_eo - match[subex].rm_so + 1;
493 strlcpy(editedhost, HN + match[subex].rm_so, totalsize >
494 sizeof(editedhost) ? sizeof(editedhost) : totalsize);
495 }
496 free(match);
497 regfree(®ex);
498 if (found)
499 return;
500 /*
501 * In case of any errors, or if the pattern did not match, pass
502 * the original hostname as is.
503 */
504 copyasis:
505 strlcpy(editedhost, HN, sizeof(editedhost));
506 }
507
508 static struct speedtab {
509 int speed;
510 int uxname;
511 } speedtab[] = {
512 { 50, B50 },
513 { 75, B75 },
514 { 110, B110 },
515 { 134, B134 },
516 { 150, B150 },
517 { 200, B200 },
518 { 300, B300 },
519 { 600, B600 },
520 { 1200, B1200 },
521 { 1800, B1800 },
522 { 2400, B2400 },
523 { 4800, B4800 },
524 { 9600, B9600 },
525 { 19200, EXTA },
526 { 19, EXTA }, /* for people who say 19.2K */
527 { 38400, EXTB },
528 { 38, EXTB },
529 { 7200, EXTB }, /* alternative */
530 { 57600, B57600 },
531 { 115200, B115200 },
532 { 230400, B230400 },
533 { 0, 0 }
534 };
535
536 int
speed(int val)537 speed(int val)
538 {
539 struct speedtab *sp;
540
541 if (val <= B230400)
542 return (val);
543
544 for (sp = speedtab; sp->speed; sp++)
545 if (sp->speed == val)
546 return (sp->uxname);
547
548 return (B300); /* default in impossible cases */
549 }
550
551 void
makeenv(char * env[])552 makeenv(char *env[])
553 {
554 static char termbuf[128] = "TERM=";
555 char *p, *q;
556 char **ep;
557
558 ep = env;
559 if (TT && *TT) {
560 strlcat(termbuf, TT, sizeof(termbuf));
561 *ep++ = termbuf;
562 }
563 if ((p = EV)) {
564 q = p;
565 while ((q = strchr(q, ','))) {
566 *q++ = '\0';
567 *ep++ = p;
568 p = q;
569 }
570 if (*p)
571 *ep++ = p;
572 }
573 *ep = (char *)0;
574 }
575
576 /*
577 * This speed select mechanism is written for the Develcon DATASWITCH.
578 * The Develcon sends a string of the form "B{speed}\n" at a predefined
579 * baud rate. This string indicates the user's actual speed.
580 * The routine below returns the terminal type mapped from derived speed.
581 */
582 static struct portselect {
583 const char *ps_baud;
584 const char *ps_type;
585 } portspeeds[] = {
586 { "B110", "std.110" },
587 { "B134", "std.134" },
588 { "B150", "std.150" },
589 { "B300", "std.300" },
590 { "B600", "std.600" },
591 { "B1200", "std.1200" },
592 { "B2400", "std.2400" },
593 { "B4800", "std.4800" },
594 { "B9600", "std.9600" },
595 { "B19200", "std.19200" },
596 { NULL, NULL }
597 };
598
599 const char *
portselector(void)600 portselector(void)
601 {
602 char c, baud[20];
603 const char *type = "default";
604 struct portselect *ps;
605 size_t len;
606
607 alarm(5*60);
608 for (len = 0; len < sizeof (baud) - 1; len++) {
609 if (read(STDIN_FILENO, &c, 1) <= 0)
610 break;
611 c &= 0177;
612 if (c == '\n' || c == '\r')
613 break;
614 if (c == 'B')
615 len = 0; /* in case of leading garbage */
616 baud[len] = c;
617 }
618 baud[len] = '\0';
619 for (ps = portspeeds; ps->ps_baud; ps++)
620 if (strcmp(ps->ps_baud, baud) == 0) {
621 type = ps->ps_type;
622 break;
623 }
624 sleep(2); /* wait for connection to complete */
625 return (type);
626 }
627
628 /*
629 * This auto-baud speed select mechanism is written for the Micom 600
630 * portselector. Selection is done by looking at how the character '\r'
631 * is garbled at the different speeds.
632 */
633 const char *
autobaud(void)634 autobaud(void)
635 {
636 struct pollfd set[1];
637 struct timespec timeout;
638 char c;
639 const char *type = "9600-baud";
640
641 (void)tcflush(0, TCIOFLUSH);
642 set[0].fd = STDIN_FILENO;
643 set[0].events = POLLIN;
644 if (poll(set, 1, 5000) <= 0)
645 return (type);
646 if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
647 return (type);
648 timeout.tv_sec = 0;
649 timeout.tv_nsec = 20000;
650 (void)nanosleep(&timeout, NULL);
651 (void)tcflush(0, TCIOFLUSH);
652 switch (c & 0377) {
653
654 case 0200: /* 300-baud */
655 type = "300-baud";
656 break;
657
658 case 0346: /* 1200-baud */
659 type = "1200-baud";
660 break;
661
662 case 015: /* 2400-baud */
663 case 0215:
664 type = "2400-baud";
665 break;
666
667 default: /* 4800-baud */
668 type = "4800-baud";
669 break;
670
671 case 0377: /* 9600-baud */
672 type = "9600-baud";
673 break;
674 }
675 return (type);
676 }
677