libexec/getty/subr.c

   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  * @(#)from: subr.c     8.1 (Berkeley) 6/4/93
  32  * $FreeBSD: head/libexec/getty/subr.c 329724 2018-02-21 15:57:24Z trasz $
  33  */
  34
  35 /*
  36  * Melbourne getty.
  37  */
  38 #include <sys/ioctl.h>
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41
  42 #include <poll.h>
  43 #include <regex.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <syslog.h>
  47 #include <termios.h>
  48 #include <unistd.h>
  49
  50 #include "gettytab.h"
  51 #include "pathnames.h"
  52 #include "extern.h"
  53
  54 /*
  55  * Get a table entry.
  56  */
  57 void
  58 gettable(const char *name, char *buf)
  59 {
  60         struct gettystrs *sp;
  61         struct gettynums *np;
  62         struct gettyflags *fp;
  63         long n;
  64         int l;
  65         char *p;
  66         static char path_gettytab[PATH_MAX];
  67         char *dba[2];
  68
  69         static int firsttime = 1;
  70
  71         strlcpy(path_gettytab, _PATH_GETTYTAB, sizeof(path_gettytab));
  72         dba[0] = path_gettytab;
  73         dba[1] = NULL;
  74
  75         if (firsttime) {
  76                 /*
  77                  * we need to strdup() anything in the strings array
  78                  * initially in order to simplify things later
  79                  */
  80                 for (sp = gettystrs; sp->field; sp++)
  81                         if (sp->value != NULL) {
  82                                 /* handle these ones more carefully */
  83                                 if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
  84                                         l = 2;
  85                                 else
  86                                         l = strlen(sp->value) + 1;
  87                                 if ((p = malloc(l)) != NULL) {
  88                                         strncpy(p, sp->value, l);
  89                                         p[l-1] = '\0';
  90                                 }
  91                                 /*
  92                                  * replace, even if NULL, else we'll
  93                                  * have problems with free()ing static mem
  94                                  */
  95                                 sp->value = p;
  96                         }
  97                 firsttime = 0;
  98         }
  99
 100         switch (cgetent(&buf, dba, name)) {
 101         case 1:
 102                 syslog(LOG_ERR, "getty: couldn't resolve 'tc=' in gettytab '%s'", name);
 103                 return;
 104         case 0:
 105                 break;
 106         case -1:
 107                 syslog(LOG_ERR, "getty: unknown gettytab entry '%s'", name);
 108                 return;
 109         case -2:
 110                 syslog(LOG_ERR, "getty: retrieving gettytab entry '%s': %m", name);
 111                 return;
 112         case -3:
 113                 syslog(LOG_ERR, "getty: recursive 'tc=' reference gettytab entry '%s'", name);
 114                 return;
 115         default:
 116                 syslog(LOG_ERR, "getty: unexpected cgetent() error for entry '%s'", name);
 117                 return;
 118         }
 119
 120         for (sp = gettystrs; sp->field; sp++) {
 121                 if ((l = cgetstr(buf, sp->field, &p)) >= 0) {
 122                         if (sp->value) {
 123                                 /* prefer existing value */
 124                                 if (strcmp(p, sp->value) != 0)
 125                                         free(sp->value);
 126                                 else {
 127                                         free(p);
 128                                         p = sp->value;
 129                                 }
 130                         }
 131                         sp->value = p;
 132                 } else if (l == -1) {
 133                         free(sp->value);
 134                         sp->value = NULL;
 135                 }
 136         }
 137
 138         for (np = gettynums; np->field; np++) {
 139                 if (cgetnum(buf, np->field, &n) == -1)
 140                         np->set = 0;
 141                 else {
 142                         np->set = 1;
 143                         np->value = n;
 144                 }
 145         }
 146
 147         for (fp = gettyflags; fp->field; fp++) {
 148                 if (cgetcap(buf, fp->field, ':') == NULL)
 149                         fp->set = 0;
 150                 else {
 151                         fp->set = 1;
 152                         fp->value = 1 ^ fp->invrt;
 153                 }
 154         }
 155 }
 156
 157 void
 158 gendefaults(void)
 159 {
 160         struct gettystrs *sp;
 161         struct gettynums *np;
 162         struct gettyflags *fp;
 163
 164         for (sp = gettystrs; sp->field; sp++)
 165                 if (sp->value)
 166                         sp->defalt = strdup(sp->value);
 167         for (np = gettynums; np->field; np++)
 168                 if (np->set)
 169                         np->defalt = np->value;
 170         for (fp = gettyflags; fp->field; fp++)
 171                 if (fp->set)
 172                         fp->defalt = fp->value;
 173                 else
 174                         fp->defalt = fp->invrt;
 175 }
 176
 177 void
 178 setdefaults(void)
 179 {
 180         struct gettystrs *sp;
 181         struct gettynums *np;
 182         struct gettyflags *fp;
 183
 184         for (sp = gettystrs; sp->field; sp++)
 185                 if (!sp->value)
 186                         sp->value = !sp->defalt ? sp->defalt
 187                                                 : strdup(sp->defalt);
 188         for (np = gettynums; np->field; np++)
 189                 if (!np->set)
 190                         np->value = np->defalt;
 191         for (fp = gettyflags; fp->field; fp++)
 192                 if (!fp->set)
 193                         fp->value = fp->defalt;
 194 }
 195
 196 static char **
 197 charnames[] = {
 198         &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
 199         &SU, &DS, &RP, &FL, &WE, &LN, 0
 200 };
 201
 202 static char *
 203 charvars[] = {
 204         &tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
 205         &tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
 206         &tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
 207         &tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
 208         &tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
 209 };
 210
 211 void
 212 setchars(void)
 213 {
 214         int i;
 215         const char *p;
 216
 217         for (i = 0; charnames[i]; i++) {
 218                 p = *charnames[i];
 219                 if (p && *p)
 220                         *charvars[i] = *p;
 221                 else
 222                         *charvars[i] = _POSIX_VDISABLE;
 223         }
 224 }
 225
 226 /* Macros to clear/set/test flags. */
 227 #define SET(t, f)       (t) |= (f)
 228 #define CLR(t, f)       (t) &= ~(f)
 229 #define ISSET(t, f)     ((t) & (f))
 230
 231 void
 232 set_flags(int n)
 233 {
 234         tcflag_t iflag, oflag, cflag, lflag;
 235
 236
 237         switch (n) {
 238         case 0:
 239                 if (C0set && I0set && L0set && O0set) {
 240                         tmode.c_cflag = C0;
 241                         tmode.c_iflag = I0;
 242                         tmode.c_lflag = L0;
 243                         tmode.c_oflag = O0;
 244                         return;
 245                 }
 246                 break;
 247         case 1:
 248                 if (C1set && I1set && L1set && O1set) {
 249                         tmode.c_cflag = C1;
 250                         tmode.c_iflag = I1;
 251                         tmode.c_lflag = L1;
 252                         tmode.c_oflag = O1;
 253                         return;
 254                 }
 255                 break;
 256         default:
 257                 if (C2set && I2set && L2set && O2set) {
 258                         tmode.c_cflag = C2;
 259                         tmode.c_iflag = I2;
 260                         tmode.c_lflag = L2;
 261                         tmode.c_oflag = O2;
 262                         return;
 263                 }
 264                 break;
 265         }
 266
 267         iflag = omode.c_iflag;
 268         oflag = omode.c_oflag;
 269         cflag = omode.c_cflag;
 270         lflag = omode.c_lflag;
 271
 272         if (NP) {
 273                 CLR(cflag, CSIZE|PARENB);
 274                 SET(cflag, CS8);
 275                 CLR(iflag, ISTRIP|INPCK|IGNPAR);
 276         } else if (AP || EP || OP) {
 277                 CLR(cflag, CSIZE);
 278                 SET(cflag, CS7|PARENB);
 279                 SET(iflag, ISTRIP);
 280                 if (OP && !EP) {
 281                         SET(iflag, INPCK|IGNPAR);
 282                         SET(cflag, PARODD);
 283                         if (AP)
 284                                 CLR(iflag, INPCK);
 285                 } else if (EP && !OP) {
 286                         SET(iflag, INPCK|IGNPAR);
 287                         CLR(cflag, PARODD);
 288                         if (AP)
 289                                 CLR(iflag, INPCK);
 290                 } else if (AP || (EP && OP)) {
 291                         CLR(iflag, INPCK|IGNPAR);
 292                         CLR(cflag, PARODD);
 293                 }
 294         } /* else, leave as is */
 295
 296         if (HC)
 297                 SET(cflag, HUPCL);
 298         else
 299                 CLR(cflag, HUPCL);
 300
 301         if (MB)
 302                 SET(cflag, MDMBUF);
 303         else
 304                 CLR(cflag, MDMBUF);
 305
 306         if (HW)
 307                 SET(cflag, CRTSCTS);
 308         else
 309                 CLR(cflag, CRTSCTS);
 310
 311         if (NL) {
 312                 SET(iflag, ICRNL);
 313                 SET(oflag, ONLCR|OPOST);
 314         } else {
 315                 CLR(iflag, ICRNL);
 316                 CLR(oflag, ONLCR);
 317         }
 318
 319         if (!HT)
 320                 SET(oflag, OXTABS|OPOST);
 321         else
 322                 CLR(oflag, OXTABS);
 323
 324 #ifdef XXX_DELAY
 325         SET(f, delaybits());
 326 #endif
 327
 328         if (n == 1) {           /* read mode flags */
 329                 if (RW) {
 330                         iflag = 0;
 331                         CLR(oflag, OPOST);
 332                         CLR(cflag, CSIZE|PARENB);
 333                         SET(cflag, CS8);
 334                         lflag = 0;
 335                 } else {
 336                         CLR(lflag, ICANON);
 337                 }
 338                 goto out;
 339         }
 340
 341         if (n == 0)
 342                 goto out;
 343
 344 #if 0
 345         if (CB)
 346                 SET(f, CRTBS);
 347 #endif
 348
 349         if (CE)
 350                 SET(lflag, ECHOE);
 351         else
 352                 CLR(lflag, ECHOE);
 353
 354         if (CK)
 355                 SET(lflag, ECHOKE);
 356         else
 357                 CLR(lflag, ECHOKE);
 358
 359         if (PE)
 360                 SET(lflag, ECHOPRT);
 361         else
 362                 CLR(lflag, ECHOPRT);
 363
 364         if (EC)
 365                 SET(lflag, ECHO);
 366         else
 367                 CLR(lflag, ECHO);
 368
 369         if (XC)
 370                 SET(lflag, ECHOCTL);
 371         else
 372                 CLR(lflag, ECHOCTL);
 373
 374         if (DX)
 375                 SET(lflag, IXANY);
 376         else
 377                 CLR(lflag, IXANY);
 378
 379 out:
 380         tmode.c_iflag = iflag;
 381         tmode.c_oflag = oflag;
 382         tmode.c_cflag = cflag;
 383         tmode.c_lflag = lflag;
 384 }
 385
 386
 387 #ifdef XXX_DELAY
 388 struct delayval {
 389         unsigned        delay;          /* delay in ms */
 390         int             bits;
 391 };
 392
 393 /*
 394  * below are random guesses, I can't be bothered checking
 395  */
 396
 397 struct delayval crdelay[] = {
 398         { 1,            CR1 },
 399         { 2,            CR2 },
 400         { 3,            CR3 },
 401         { 83,           CR1 },
 402         { 166,          CR2 },
 403         { 0,            CR3 },
 404 };
 405
 406 struct delayval nldelay[] = {
 407         { 1,            NL1 },          /* special, calculated */
 408         { 2,            NL2 },
 409         { 3,            NL3 },
 410         { 100,          NL2 },
 411         { 0,            NL3 },
 412 };
 413
 414 struct delayval bsdelay[] = {
 415         { 1,            BS1 },
 416         { 0,            0 },
 417 };
 418
 419 struct delayval ffdelay[] = {
 420         { 1,            FF1 },
 421         { 1750,         FF1 },
 422         { 0,            FF1 },
 423 };
 424
 425 struct delayval tbdelay[] = {
 426         { 1,            TAB1 },
 427         { 2,            TAB2 },
 428         { 3,            XTABS },        /* this is expand tabs */
 429         { 100,          TAB1 },
 430         { 0,            TAB2 },
 431 };
 432
 433 int
 434 delaybits(void)
 435 {
 436         int f;
 437
 438         f  = adelay(CD, crdelay);
 439         f |= adelay(ND, nldelay);
 440         f |= adelay(FD, ffdelay);
 441         f |= adelay(TD, tbdelay);
 442         f |= adelay(BD, bsdelay);
 443         return (f);
 444 }
 445
 446 int
 447 adelay(int ms, struct delayval *dp)
 448 {
 449         if (ms == 0)
 450                 return (0);
 451         while (dp->delay && ms > dp->delay)
 452                 dp++;
 453         return (dp->bits);
 454 }
 455 #endif
 456
 457 char    editedhost[MAXHOSTNAMELEN];
 458
 459 void
 460 edithost(const char *pattern)
 461 {
 462         regex_t regex;
 463         regmatch_t *match;
 464         int found;
 465
 466         if (pattern == NULL || *pattern == '\0')
 467                 goto copyasis;
 468         if (regcomp(&regex, pattern, REG_EXTENDED) != 0)
 469                 goto copyasis;
 470
 471         match = calloc(regex.re_nsub + 1, sizeof(*match));
 472         if (match == NULL) {
 473                 regfree(&regex);
 474                 goto copyasis;
 475         }
 476
 477         found = !regexec(&regex, HN, regex.re_nsub + 1, match, 0);
 478         if (found) {
 479                 size_t subex, totalsize;
 480
 481                 /*
 482                  * We found a match.  If there were no parenthesized
 483                  * subexpressions in the pattern, use entire matched
 484                  * string as ``editedhost''; otherwise use the first
 485                  * matched subexpression.
 486                  */
 487                 subex = !!regex.re_nsub;
 488                 totalsize = match[subex].rm_eo - match[subex].rm_so + 1;
 489                 strlcpy(editedhost, HN + match[subex].rm_so, totalsize >
 490                     sizeof(editedhost) ? sizeof(editedhost) : totalsize);
 491         }
 492         free(match);
 493         regfree(&regex);
 494         if (found)
 495                 return;
 496         /*
 497          * In case of any errors, or if the pattern did not match, pass
 498          * the original hostname as is.
 499          */
 500  copyasis:
 501         strlcpy(editedhost, HN, sizeof(editedhost));
 502 }
 503
 504 static struct speedtab {
 505         int     speed;
 506         int     uxname;
 507 } speedtab[] = {
 508         { 50,   B50 },
 509         { 75,   B75 },
 510         { 110,  B110 },
 511         { 134,  B134 },
 512         { 150,  B150 },
 513         { 200,  B200 },
 514         { 300,  B300 },
 515         { 600,  B600 },
 516         { 1200, B1200 },
 517         { 1800, B1800 },
 518         { 2400, B2400 },
 519         { 4800, B4800 },
 520         { 9600, B9600 },
 521         { 19200, EXTA },
 522         { 19,   EXTA },         /* for people who say 19.2K */
 523         { 38400, EXTB },
 524         { 38,   EXTB },
 525         { 7200, EXTB },         /* alternative */
 526         { 57600, B57600 },
 527         { 115200, B115200 },
 528         { 230400, B230400 },
 529         { 0, 0 }
 530 };
 531
 532 int
 533 speed(int val)
 534 {
 535         struct speedtab *sp;
 536
 537         if (val <= B230400)
 538                 return (val);
 539
 540         for (sp = speedtab; sp->speed; sp++)
 541                 if (sp->speed == val)
 542                         return (sp->uxname);
 543
 544         return (B300);          /* default in impossible cases */
 545 }
 546
 547 void
 548 makeenv(char *env[])
 549 {
 550         static char termbuf[128] = "TERM=";
 551         char *p, *q;
 552         char **ep;
 553
 554         ep = env;
 555         if (TT && *TT) {
 556                 strlcat(termbuf, TT, sizeof(termbuf));
 557                 *ep++ = termbuf;
 558         }
 559         if ((p = EV)) {
 560                 q = p;
 561                 while ((q = strchr(q, ','))) {
 562                         *q++ = '\0';
 563                         *ep++ = p;
 564                         p = q;
 565                 }
 566                 if (*p)
 567                         *ep++ = p;
 568         }
 569         *ep = NULL;
 570 }
 571
 572 /*
 573  * This speed select mechanism is written for the Develcon DATASWITCH.
 574  * The Develcon sends a string of the form "B{speed}\n" at a predefined
 575  * baud rate. This string indicates the user's actual speed.
 576  * The routine below returns the terminal type mapped from derived speed.
 577  */
 578 static struct   portselect {
 579         const char      *ps_baud;
 580         const char      *ps_type;
 581 } portspeeds[] = {
 582         { "B110",       "std.110" },
 583         { "B134",       "std.134" },
 584         { "B150",       "std.150" },
 585         { "B300",       "std.300" },
 586         { "B600",       "std.600" },
 587         { "B1200",      "std.1200" },
 588         { "B2400",      "std.2400" },
 589         { "B4800",      "std.4800" },
 590         { "B9600",      "std.9600" },
 591         { "B19200",     "std.19200" },
 592         { "B38400",     "std.38400" },
 593         { "B57600",     "std.57600" },
 594         { "B115200",    "std.115200" },
 595         { "B230400",    "std.230400" },
 596         { NULL, NULL }
 597 };
 598
 599 const char *
 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 *
 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 }