libexec/getty/subr.c

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 #if 0
  32 static char sccsid[] = "@(#)from: subr.c        8.1 (Berkeley) 6/4/93";
  33 #endif
  34 static const char rcsid[] =
  35   "$FreeBSD$";
  36 #endif /* not lint */
  37
  38 /*
  39  * Melbourne getty.
  40  */
  41 #include <sys/ioctl.h>
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44
  45 #include <poll.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <syslog.h>
  49 #include <termios.h>
  50 #include <unistd.h>
  51
  52 #include "gettytab.h"
  53 #include "pathnames.h"
  54 #include "extern.h"
  55
  56
  57
  58 /*
  59  * Get a table entry.
  60  */
  61 void
  62 gettable(const char *name, char *buf)
  63 {
  64         struct gettystrs *sp;
  65         struct gettynums *np;
  66         struct gettyflags *fp;
  67         long n;
  68         int l;
  69         char *p;
  70         char *msg = NULL;
  71         const char *dba[2];
  72
  73         static int firsttime = 1;
  74
  75         dba[0] = _PATH_GETTYTAB;
  76         dba[1] = NULL;
  77
  78         if (firsttime) {
  79                 /*
  80                  * we need to strdup() anything in the strings array
  81                  * initially in order to simplify things later
  82                  */
  83                 for (sp = gettystrs; sp->field; sp++)
  84                         if (sp->value != NULL) {
  85                                 /* handle these ones more carefully */
  86                                 if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
  87                                         l = 2;
  88                                 else
  89                                         l = strlen(sp->value) + 1;
  90                                 if ((p = malloc(l)) != NULL) {
  91                                         strncpy(p, sp->value, l);
  92                                         p[l-1] = '\0';
  93                                 }
  94                                 /*
  95                                  * replace, even if NULL, else we'll
  96                                  * have problems with free()ing static mem
  97                                  */
  98                                 sp->value = p;
  99                         }
 100                 firsttime = 0;
 101         }
 102
 103         switch (cgetent(&buf, (char **)dba, (char *)name)) {
 104         case 1:
 105                 msg = "%s: couldn't resolve 'tc=' in gettytab '%s'";
 106         case 0:
 107                 break;
 108         case -1:
 109                 msg = "%s: unknown gettytab entry '%s'";
 110                 break;
 111         case -2:
 112                 msg = "%s: retrieving gettytab entry '%s': %m";
 113                 break;
 114         case -3:
 115                 msg = "%s: recursive 'tc=' reference gettytab entry '%s'";
 116                 break;
 117         default:
 118                 msg = "%s: unexpected cgetent() error for entry '%s'";
 119                 break;
 120         }
 121
 122         if (msg != NULL) {
 123                 syslog(LOG_ERR, msg, "getty", name);
 124                 return;
 125         }
 126
 127         for (sp = gettystrs; sp->field; sp++) {
 128                 if ((l = cgetstr(buf, (char*)sp->field, &p)) >= 0) {
 129                         if (sp->value) {
 130                                 /* prefer existing value */
 131                                 if (strcmp(p, sp->value) != 0)
 132                                         free(sp->value);
 133                                 else {
 134                                         free(p);
 135                                         p = sp->value;
 136                                 }
 137                         }
 138                         sp->value = p;
 139                 } else if (l == -1) {
 140                         free(sp->value);
 141                         sp->value = NULL;
 142                 }
 143         }
 144
 145         for (np = gettynums; np->field; np++) {
 146                 if (cgetnum(buf, (char*)np->field, &n) == -1)
 147                         np->set = 0;
 148                 else {
 149                         np->set = 1;
 150                         np->value = n;
 151                 }
 152         }
 153
 154         for (fp = gettyflags; fp->field; fp++) {
 155                 if (cgetcap(buf, (char *)fp->field, ':') == NULL)
 156                         fp->set = 0;
 157                 else {
 158                         fp->set = 1;
 159                         fp->value = 1 ^ fp->invrt;
 160                 }
 161         }
 162 }
 163
 164 void
 165 gendefaults(void)
 166 {
 167         struct gettystrs *sp;
 168         struct gettynums *np;
 169         struct gettyflags *fp;
 170
 171         for (sp = gettystrs; sp->field; sp++)
 172                 if (sp->value)
 173                         sp->defalt = strdup(sp->value);
 174         for (np = gettynums; np->field; np++)
 175                 if (np->set)
 176                         np->defalt = np->value;
 177         for (fp = gettyflags; fp->field; fp++)
 178                 if (fp->set)
 179                         fp->defalt = fp->value;
 180                 else
 181                         fp->defalt = fp->invrt;
 182 }
 183
 184 void
 185 setdefaults(void)
 186 {
 187         struct gettystrs *sp;
 188         struct gettynums *np;
 189         struct gettyflags *fp;
 190
 191         for (sp = gettystrs; sp->field; sp++)
 192                 if (!sp->value)
 193                         sp->value = !sp->defalt ? sp->defalt
 194                                                 : strdup(sp->defalt);
 195         for (np = gettynums; np->field; np++)
 196                 if (!np->set)
 197                         np->value = np->defalt;
 198         for (fp = gettyflags; fp->field; fp++)
 199                 if (!fp->set)
 200                         fp->value = fp->defalt;
 201 }
 202
 203 static char **
 204 charnames[] = {
 205         &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
 206         &SU, &DS, &RP, &FL, &WE, &LN, 0
 207 };
 208
 209 static char *
 210 charvars[] = {
 211         &tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
 212         &tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
 213         &tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
 214         &tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
 215         &tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
 216 };
 217
 218 void
 219 setchars(void)
 220 {
 221         int i;
 222         const char *p;
 223
 224         for (i = 0; charnames[i]; i++) {
 225                 p = *charnames[i];
 226                 if (p && *p)
 227                         *charvars[i] = *p;
 228                 else
 229                         *charvars[i] = _POSIX_VDISABLE;
 230         }
 231 }
 232
 233 /* Macros to clear/set/test flags. */
 234 #define SET(t, f)       (t) |= (f)
 235 #define CLR(t, f)       (t) &= ~(f)
 236 #define ISSET(t, f)     ((t) & (f))
 237
 238 void
 239 set_flags(int n)
 240 {
 241         tcflag_t iflag, oflag, cflag, lflag;
 242
 243
 244         switch (n) {
 245         case 0:
 246                 if (C0set && I0set && L0set && O0set) {
 247                         tmode.c_cflag = C0;
 248                         tmode.c_iflag = I0;
 249                         tmode.c_lflag = L0;
 250                         tmode.c_oflag = O0;
 251                         return;
 252                 }
 253                 break;
 254         case 1:
 255                 if (C1set && I1set && L1set && O1set) {
 256                         tmode.c_cflag = C1;
 257                         tmode.c_iflag = I1;
 258                         tmode.c_lflag = L1;
 259                         tmode.c_oflag = O1;
 260                         return;
 261                 }
 262                 break;
 263         default:
 264                 if (C2set && I2set && L2set && O2set) {
 265                         tmode.c_cflag = C2;
 266                         tmode.c_iflag = I2;
 267                         tmode.c_lflag = L2;
 268                         tmode.c_oflag = O2;
 269                         return;
 270                 }
 271                 break;
 272         }
 273
 274         iflag = omode.c_iflag;
 275         oflag = omode.c_oflag;
 276         cflag = omode.c_cflag;
 277         lflag = omode.c_lflag;
 278
 279         if (NP) {
 280                 CLR(cflag, CSIZE|PARENB);
 281                 SET(cflag, CS8);
 282                 CLR(iflag, ISTRIP|INPCK|IGNPAR);
 283         } else if (AP || EP || OP) {
 284                 CLR(cflag, CSIZE);
 285                 SET(cflag, CS7|PARENB);
 286                 SET(iflag, ISTRIP);
 287                 if (OP && !EP) {
 288                         SET(iflag, INPCK|IGNPAR);
 289                         SET(cflag, PARODD);
 290                         if (AP)
 291                                 CLR(iflag, INPCK);
 292                 } else if (EP && !OP) {
 293                         SET(iflag, INPCK|IGNPAR);
 294                         CLR(cflag, PARODD);
 295                         if (AP)
 296                                 CLR(iflag, INPCK);
 297                 } else if (AP || (EP && OP)) {
 298                         CLR(iflag, INPCK|IGNPAR);
 299                         CLR(cflag, PARODD);
 300                 }
 301         } /* else, leave as is */
 302
 303 #if 0
 304         if (UC)
 305                 f |= LCASE;
 306 #endif
 307
 308         if (HC)
 309                 SET(cflag, HUPCL);
 310         else
 311                 CLR(cflag, HUPCL);
 312
 313         if (MB)
 314                 SET(cflag, MDMBUF);
 315         else
 316                 CLR(cflag, MDMBUF);
 317
 318         if (HW)
 319                 SET(cflag, CRTSCTS);
 320         else
 321                 CLR(cflag, CRTSCTS);
 322
 323         if (NL) {
 324                 SET(iflag, ICRNL);
 325                 SET(oflag, ONLCR|OPOST);
 326         } else {
 327                 CLR(iflag, ICRNL);
 328                 CLR(oflag, ONLCR);
 329         }
 330
 331         if (!HT)
 332                 SET(oflag, OXTABS|OPOST);
 333         else
 334                 CLR(oflag, OXTABS);
 335
 336 #ifdef XXX_DELAY
 337         SET(f, delaybits());
 338 #endif
 339
 340         if (n == 1) {           /* read mode flags */
 341                 if (RW) {
 342                         iflag = 0;
 343                         CLR(oflag, OPOST);
 344                         CLR(cflag, CSIZE|PARENB);
 345                         SET(cflag, CS8);
 346                         lflag = 0;
 347                 } else {
 348                         CLR(lflag, ICANON);
 349                 }
 350                 goto out;
 351         }
 352
 353         if (n == 0)
 354                 goto out;
 355
 356 #if 0
 357         if (CB)
 358                 SET(f, CRTBS);
 359 #endif
 360
 361         if (CE)
 362                 SET(lflag, ECHOE);
 363         else
 364                 CLR(lflag, ECHOE);
 365
 366         if (CK)
 367                 SET(lflag, ECHOKE);
 368         else
 369                 CLR(lflag, ECHOKE);
 370
 371         if (PE)
 372                 SET(lflag, ECHOPRT);
 373         else
 374                 CLR(lflag, ECHOPRT);
 375
 376         if (EC)
 377                 SET(lflag, ECHO);
 378         else
 379                 CLR(lflag, ECHO);
 380
 381         if (XC)
 382                 SET(lflag, ECHOCTL);
 383         else
 384                 CLR(lflag, ECHOCTL);
 385
 386         if (DX)
 387                 SET(lflag, IXANY);
 388         else
 389                 CLR(lflag, IXANY);
 390
 391 out:
 392         tmode.c_iflag = iflag;
 393         tmode.c_oflag = oflag;
 394         tmode.c_cflag = cflag;
 395         tmode.c_lflag = lflag;
 396 }
 397
 398
 399 #ifdef XXX_DELAY
 400 struct delayval {
 401         unsigned        delay;          /* delay in ms */
 402         int             bits;
 403 };
 404
 405 /*
 406  * below are random guesses, I can't be bothered checking
 407  */
 408
 409 struct delayval crdelay[] = {
 410         { 1,            CR1 },
 411         { 2,            CR2 },
 412         { 3,            CR3 },
 413         { 83,           CR1 },
 414         { 166,          CR2 },
 415         { 0,            CR3 },
 416 };
 417
 418 struct delayval nldelay[] = {
 419         { 1,            NL1 },          /* special, calculated */
 420         { 2,            NL2 },
 421         { 3,            NL3 },
 422         { 100,          NL2 },
 423         { 0,            NL3 },
 424 };
 425
 426 struct delayval bsdelay[] = {
 427         { 1,            BS1 },
 428         { 0,            0 },
 429 };
 430
 431 struct delayval ffdelay[] = {
 432         { 1,            FF1 },
 433         { 1750,         FF1 },
 434         { 0,            FF1 },
 435 };
 436
 437 struct delayval tbdelay[] = {
 438         { 1,            TAB1 },
 439         { 2,            TAB2 },
 440         { 3,            XTABS },        /* this is expand tabs */
 441         { 100,          TAB1 },
 442         { 0,            TAB2 },
 443 };
 444
 445 int
 446 delaybits(void)
 447 {
 448         int f;
 449
 450         f  = adelay(CD, crdelay);
 451         f |= adelay(ND, nldelay);
 452         f |= adelay(FD, ffdelay);
 453         f |= adelay(TD, tbdelay);
 454         f |= adelay(BD, bsdelay);
 455         return (f);
 456 }
 457
 458 int
 459 adelay(int ms, struct delayval *dp)
 460 {
 461         if (ms == 0)
 462                 return (0);
 463         while (dp->delay && ms > dp->delay)
 464                 dp++;
 465         return (dp->bits);
 466 }
 467 #endif
 468
 469 char    editedhost[MAXHOSTNAMELEN];
 470
 471 void
 472 edithost(const char *pat)
 473 {
 474         const char *host = HN;
 475         char *res = editedhost;
 476
 477         if (!pat)
 478                 pat = "";
 479         while (*pat) {
 480                 switch (*pat) {
 481
 482                 case '#':
 483                         if (*host)
 484                                 host++;
 485                         break;
 486
 487                 case '@':
 488                         if (*host)
 489                                 *res++ = *host++;
 490                         break;
 491
 492                 default:
 493                         *res++ = *pat;
 494                         break;
 495
 496                 }
 497                 if (res == &editedhost[sizeof editedhost - 1]) {
 498                         *res = '\0';
 499                         return;
 500                 }
 501                 pat++;
 502         }
 503         if (*host)
 504                 strncpy(res, host, sizeof editedhost - (res - editedhost) - 1);
 505         else
 506                 *res = '\0';
 507         editedhost[sizeof editedhost - 1] = '\0';
 508 }
 509
 510 static struct speedtab {
 511         int     speed;
 512         int     uxname;
 513 } speedtab[] = {
 514         { 50,   B50 },
 515         { 75,   B75 },
 516         { 110,  B110 },
 517         { 134,  B134 },
 518         { 150,  B150 },
 519         { 200,  B200 },
 520         { 300,  B300 },
 521         { 600,  B600 },
 522         { 1200, B1200 },
 523         { 1800, B1800 },
 524         { 2400, B2400 },
 525         { 4800, B4800 },
 526         { 9600, B9600 },
 527         { 19200, EXTA },
 528         { 19,   EXTA },         /* for people who say 19.2K */
 529         { 38400, EXTB },
 530         { 38,   EXTB },
 531         { 7200, EXTB },         /* alternative */
 532         { 57600, B57600 },
 533         { 115200, B115200 },
 534         { 230400, B230400 },
 535         { 0 }
 536 };
 537
 538 int
 539 speed(int val)
 540 {
 541         struct speedtab *sp;
 542
 543         if (val <= B230400)
 544                 return (val);
 545
 546         for (sp = speedtab; sp->speed; sp++)
 547                 if (sp->speed == val)
 548                         return (sp->uxname);
 549
 550         return (B300);          /* default in impossible cases */
 551 }
 552
 553 void
 554 makeenv(char *env[])
 555 {
 556         static char termbuf[128] = "TERM=";
 557         char *p, *q;
 558         char **ep;
 559
 560         ep = env;
 561         if (TT && *TT) {
 562                 strlcat(termbuf, TT, sizeof(termbuf));
 563                 *ep++ = termbuf;
 564         }
 565         if ((p = EV)) {
 566                 q = p;
 567                 while ((q = strchr(q, ','))) {
 568                         *q++ = '\0';
 569                         *ep++ = p;
 570                         p = q;
 571                 }
 572                 if (*p)
 573                         *ep++ = p;
 574         }
 575         *ep = (char *)0;
 576 }
 577
 578 /*
 579  * This speed select mechanism is written for the Develcon DATASWITCH.
 580  * The Develcon sends a string of the form "B{speed}\n" at a predefined
 581  * baud rate. This string indicates the user's actual speed.
 582  * The routine below returns the terminal type mapped from derived speed.
 583  */
 584 struct  portselect {
 585         const char      *ps_baud;
 586         const char      *ps_type;
 587 } portspeeds[] = {
 588         { "B110",       "std.110" },
 589         { "B134",       "std.134" },
 590         { "B150",       "std.150" },
 591         { "B300",       "std.300" },
 592         { "B600",       "std.600" },
 593         { "B1200",      "std.1200" },
 594         { "B2400",      "std.2400" },
 595         { "B4800",      "std.4800" },
 596         { "B9600",      "std.9600" },
 597         { "B19200",     "std.19200" },
 598         { NULL, NULL }
 599 };
 600
 601 const char *
 602 portselector(void)
 603 {
 604         char c, baud[20];
 605         const char *type = "default";
 606         struct portselect *ps;
 607         size_t len;
 608
 609         alarm(5*60);
 610         for (len = 0; len < sizeof (baud) - 1; len++) {
 611                 if (read(STDIN_FILENO, &c, 1) <= 0)
 612                         break;
 613                 c &= 0177;
 614                 if (c == '\n' || c == '\r')
 615                         break;
 616                 if (c == 'B')
 617                         len = 0;        /* in case of leading garbage */
 618                 baud[len] = c;
 619         }
 620         baud[len] = '\0';
 621         for (ps = portspeeds; ps->ps_baud; ps++)
 622                 if (strcmp(ps->ps_baud, baud) == 0) {
 623                         type = ps->ps_type;
 624                         break;
 625                 }
 626         sleep(2);       /* wait for connection to complete */
 627         return (type);
 628 }
 629
 630 /*
 631  * This auto-baud speed select mechanism is written for the Micom 600
 632  * portselector. Selection is done by looking at how the character '\r'
 633  * is garbled at the different speeds.
 634  */
 635 const char *
 636 autobaud(void)
 637 {
 638         struct pollfd set[1];
 639         struct timespec timeout;
 640         char c;
 641         const char *type = "9600-baud";
 642
 643         (void)tcflush(0, TCIOFLUSH);
 644         set[0].fd = STDIN_FILENO;
 645         set[0].events = POLLIN;
 646         if (poll(set, 1, 5000) <= 0)
 647                 return (type);
 648         if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
 649                 return (type);
 650         timeout.tv_sec = 0;
 651         timeout.tv_nsec = 20000;
 652         (void)nanosleep(&timeout, NULL);
 653         (void)tcflush(0, TCIOFLUSH);
 654         switch (c & 0377) {
 655
 656         case 0200:              /* 300-baud */
 657                 type = "300-baud";
 658                 break;
 659
 660         case 0346:              /* 1200-baud */
 661                 type = "1200-baud";
 662                 break;
 663
 664         case  015:              /* 2400-baud */
 665         case 0215:
 666                 type = "2400-baud";
 667                 break;
 668
 669         default:                /* 4800-baud */
 670                 type = "4800-baud";
 671                 break;
 672
 673         case 0377:              /* 9600-baud */
 674                 type = "9600-baud";
 675                 break;
 676         }
 677         return (type);
 678 }