usr.bin/calendar/io.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993, 1994
   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 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1989, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif
  37
  38 #if 0
  39 #ifndef lint
  40 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  41 #endif
  42 #endif
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include <sys/param.h>
  48 #include <sys/stat.h>
  49 #include <sys/wait.h>
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <libutil.h>
  54 #include <locale.h>
  55 #include <pwd.h>
  56 #include <stdbool.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <stringlist.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #include "pathnames.h"
  65 #include "calendar.h"
  66
  67 enum {
  68         T_OK = 0,
  69         T_ERR,
  70         T_PROCESS,
  71 };
  72
  73 const char *calendarFile = "calendar";  /* default calendar file */
  74 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE_LOCAL, _PATH_INCLUDE}; /* HOME */
  75 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  76
  77 static char path[MAXPATHLEN];
  78 static const char *cal_home;
  79 static const char *cal_dir;
  80 static const char *cal_file;
  81 static int cal_line;
  82
  83 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  84 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  85
  86 static int cal_parse(FILE *in, FILE *out);
  87
  88 static StringList *definitions = NULL;
  89 static struct event *events[MAXCOUNT];
  90 static char *extradata[MAXCOUNT];
  91
  92 static char *
  93 trimlr(char **buf)
  94 {
  95         char *walk = *buf;
  96         char *sep;
  97         char *last;
  98
  99         while (isspace(*walk))
 100                 walk++;
 101         *buf = walk;
 102
 103         sep = walk;
 104         while (*sep != '\0' && !isspace(*sep))
 105                 sep++;
 106
 107         if (*sep != '\0') {
 108                 last = sep + strlen(sep) - 1;
 109                 while (last > walk && isspace(*last))
 110                         last--;
 111                 *(last+1) = 0;
 112         }
 113
 114         return (sep);
 115 }
 116
 117 static FILE *
 118 cal_fopen(const char *file)
 119 {
 120         FILE *fp;
 121         char *home = getenv("HOME");
 122         unsigned int i;
 123         struct stat sb;
 124         static bool warned = false;
 125         static char calendarhome[MAXPATHLEN];
 126
 127         if (home == NULL || *home == '\0') {
 128                 warnx("Cannot get home directory");
 129                 return (NULL);
 130         }
 131
 132         if (chdir(home) != 0) {
 133                 warnx("Cannot enter home directory \"%s\"", home);
 134                 return (NULL);
 135         }
 136
 137         for (i = 0; i < nitems(calendarHomes); i++) {
 138                 if (snprintf(calendarhome, sizeof (calendarhome), calendarHomes[i],
 139                         getlocalbase()) >= (int)sizeof (calendarhome))
 140                         continue;
 141
 142                 if (chdir(calendarhome) != 0)
 143                         continue;
 144
 145                 if ((fp = fopen(file, "r")) != NULL) {
 146                         cal_home = home;
 147                         cal_dir = calendarhome;
 148                         cal_file = file;
 149                         return (fp);
 150                 }
 151         }
 152
 153         warnx("can't open calendar file \"%s\"", file);
 154         if (!warned && stat(_PATH_INCLUDE_LOCAL, &sb) != 0) {
 155                 warnx("calendar data files now provided by calendar-data pkg.");
 156                 warned = true;
 157         }
 158
 159         return (NULL);
 160 }
 161
 162 static char*
 163 cal_path(void)
 164 {
 165         static char buffer[MAXPATHLEN + 10];
 166
 167         if (cal_dir == NULL)
 168                 snprintf(buffer, sizeof(buffer), "%s", cal_file);
 169         else if (cal_dir[0] == '/')
 170                 snprintf(buffer, sizeof(buffer), "%s/%s", cal_dir, cal_file);
 171         else
 172                 snprintf(buffer, sizeof(buffer), "%s/%s/%s", cal_home, cal_dir, cal_file);
 173         return (buffer);
 174 }
 175
 176 #define WARN0(format)              \
 177         warnx(format " in %s line %d", cal_path(), cal_line)
 178 #define WARN1(format, arg1)                \
 179         warnx(format " in %s line %d", arg1, cal_path(), cal_line)
 180
 181 static char*
 182 cmptoken(char *line, const char* token)
 183 {
 184         char len = strlen(token);
 185
 186         if (strncmp(line, token, len) != 0)
 187                 return NULL;
 188         return (line + len);
 189 }
 190
 191 static int
 192 token(char *line, FILE *out, int *skip, int *unskip)
 193 {
 194         char *walk, *sep, a, c;
 195         const char *this_cal_home;
 196         const char *this_cal_dir;
 197         const char *this_cal_file;
 198         int this_cal_line;
 199
 200         while (isspace(*line))
 201                 line++;
 202
 203         if (cmptoken(line, "endif")) {
 204                 if (*skip + *unskip == 0) {
 205                         WARN0("#endif without prior #ifdef or #ifndef");
 206                         return (T_ERR);
 207                 }
 208                 if (*skip > 0)
 209                         --*skip;
 210                 else
 211                         --*unskip;
 212
 213                 return (T_OK);
 214         }
 215
 216         walk = cmptoken(line, "ifdef");
 217         if (walk != NULL) {
 218                 sep = trimlr(&walk);
 219
 220                 if (*walk == '\0') {
 221                         WARN0("Expecting arguments after #ifdef");
 222                         return (T_ERR);
 223                 }
 224                 if (*sep != '\0') {
 225                         WARN1("Expecting a single word after #ifdef "
 226                             "but got \"%s\"", walk);
 227                         return (T_ERR);
 228                 }
 229
 230                 if (*skip != 0 ||
 231                     definitions == NULL || sl_find(definitions, walk) == NULL)
 232                         ++*skip;
 233                 else
 234                         ++*unskip;
 235
 236                 return (T_OK);
 237         }
 238
 239         walk = cmptoken(line, "ifndef");
 240         if (walk != NULL) {
 241                 sep = trimlr(&walk);
 242
 243                 if (*walk == '\0') {
 244                         WARN0("Expecting arguments after #ifndef");
 245                         return (T_ERR);
 246                 }
 247                 if (*sep != '\0') {
 248                         WARN1("Expecting a single word after #ifndef "
 249                             "but got \"%s\"", walk);
 250                         return (T_ERR);
 251                 }
 252
 253                 if (*skip != 0 ||
 254                     (definitions != NULL && sl_find(definitions, walk) != NULL))
 255                         ++*skip;
 256                 else
 257                         ++*unskip;
 258
 259                 return (T_OK);
 260         }
 261
 262         walk = cmptoken(line, "else");
 263         if (walk != NULL) {
 264                 (void)trimlr(&walk);
 265
 266                 if (*walk != '\0') {
 267                         WARN0("Expecting no arguments after #else");
 268                         return (T_ERR);
 269                 }
 270                 if (*skip + *unskip == 0) {
 271                         WARN0("#else without prior #ifdef or #ifndef");
 272                         return (T_ERR);
 273                 }
 274
 275                 if (*skip == 0) {
 276                         ++*skip;
 277                         --*unskip;
 278                 } else if (*skip == 1) {
 279                         --*skip;
 280                         ++*unskip;
 281                 }
 282
 283                 return (T_OK);
 284         }
 285
 286         if (*skip != 0)
 287                 return (T_OK);
 288
 289         walk = cmptoken(line, "include");
 290         if (walk != NULL) {
 291                 (void)trimlr(&walk);
 292
 293                 if (*walk == '\0') {
 294                         WARN0("Expecting arguments after #include");
 295                         return (T_ERR);
 296                 }
 297
 298                 if (*walk != '<' && *walk != '\"') {
 299                         WARN0("Excecting '<' or '\"' after #include");
 300                         return (T_ERR);
 301                 }
 302
 303                 a = *walk == '<' ? '>' : '\"';
 304                 walk++;
 305                 c = walk[strlen(walk) - 1];
 306
 307                 if (a != c) {
 308                         WARN1("Unterminated include expecting '%c'", a);
 309                         return (T_ERR);
 310                 }
 311                 walk[strlen(walk) - 1] = '\0';
 312
 313                 this_cal_home = cal_home;
 314                 this_cal_dir = cal_dir;
 315                 this_cal_file = cal_file;
 316                 this_cal_line = cal_line;
 317                 if (cal_parse(cal_fopen(walk), out))
 318                         return (T_ERR);
 319                 cal_home = this_cal_home;
 320                 cal_dir = this_cal_dir;
 321                 cal_file = this_cal_file;
 322                 cal_line = this_cal_line;
 323
 324                 return (T_OK);
 325         }
 326
 327         walk = cmptoken(line, "define");
 328         if (walk != NULL) {
 329                 if (definitions == NULL)
 330                         definitions = sl_init();
 331                 sep = trimlr(&walk);
 332                 *sep = '\0';
 333
 334                 if (*walk == '\0') {
 335                         WARN0("Expecting arguments after #define");
 336                         return (T_ERR);
 337                 }
 338
 339                 if (sl_find(definitions, walk) == NULL)
 340                         sl_add(definitions, strdup(walk));
 341                 return (T_OK);
 342         }
 343
 344         walk = cmptoken(line, "undef");
 345         if (walk != NULL) {
 346                 if (definitions != NULL) {
 347                         sep = trimlr(&walk);
 348
 349                         if (*walk == '\0') {
 350                                 WARN0("Expecting arguments after #undef");
 351                                 return (T_ERR);
 352                         }
 353                         if (*sep != '\0') {
 354                                 WARN1("Expecting a single word after #undef "
 355                                     "but got \"%s\"", walk);
 356                                 return (T_ERR);
 357                         }
 358
 359                         walk = sl_find(definitions, walk);
 360                         if (walk != NULL)
 361                                 walk[0] = '\0';
 362                 }
 363                 return (T_OK);
 364         }
 365
 366         walk = cmptoken(line, "warning");
 367         if (walk != NULL) {
 368                 (void)trimlr(&walk);
 369                 WARN1("Warning: %s", walk);
 370         }
 371
 372         walk = cmptoken(line, "error");
 373         if (walk != NULL) {
 374                 (void)trimlr(&walk);
 375                 WARN1("Error: %s", walk);
 376                 return (T_ERR);
 377         }
 378
 379         WARN1("Undefined pre-processor command \"#%s\"", line);
 380         return (T_ERR);
 381 }
 382
 383 static void
 384 setup_locale(const char *locale)
 385 {
 386         (void)setlocale(LC_ALL, locale);
 387 #ifdef WITH_ICONV
 388         if (!doall)
 389                 set_new_encoding();
 390 #endif
 391         setnnames();
 392 }
 393
 394 #define REPLACE(string, slen, struct_) \
 395                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 396                         if (struct_.name != NULL)                             \
 397                                 free(struct_.name);                           \
 398                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 399                                 errx(1, "cannot allocate memory");            \
 400                         struct_.len = strlen(buf + (slen));                   \
 401                         continue;                                             \
 402                 }
 403 static int
 404 cal_parse(FILE *in, FILE *out)
 405 {
 406         char *mylocale = NULL;
 407         char *line = NULL;
 408         char *buf, *bufp;
 409         size_t linecap = 0;
 410         ssize_t linelen;
 411         ssize_t l;
 412         static int count = 0;
 413         int i;
 414         int month[MAXCOUNT];
 415         int day[MAXCOUNT];
 416         int year[MAXCOUNT];
 417         int skip = 0;
 418         int unskip = 0;
 419         char *pp, p;
 420         int flags;
 421         char *c, *cc;
 422         bool incomment = false;
 423
 424         if (in == NULL)
 425                 return (1);
 426
 427         cal_line = 0;
 428         while ((linelen = getline(&line, &linecap, in)) > 0) {
 429                 cal_line++;
 430                 buf = line;
 431                 if (buf[linelen - 1] == '\n')
 432                         buf[--linelen] = '\0';
 433
 434                 if (incomment) {
 435                         c = strstr(buf, "*/");
 436                         if (c) {
 437                                 c += 2;
 438                                 linelen -= c - buf;
 439                                 buf = c;
 440                                 incomment = false;
 441                         } else {
 442                                 continue;
 443                         }
 444                 }
 445                 if (!incomment) {
 446                         bufp = buf;
 447                         do {
 448                                 c = strstr(bufp, "//");
 449                                 cc = strstr(bufp, "/*");
 450                                 if (c != NULL && (cc == NULL || c - cc < 0)) {
 451                                         bufp = c + 2;
 452                                         /* ignore "//" within string to allow it in an URL */
 453                                         if (c == buf || isspace(c[-1])) {
 454                                                 /* single line comment */
 455                                                 *c = '\0';
 456                                                 linelen = c - buf;
 457                                                 break;
 458                                         }
 459                                 } else if (cc != NULL) {
 460                                         c = strstr(cc + 2, "*/");
 461                                         if (c != NULL) { // 'a /* b */ c' -- cc=2, c=7+2
 462                                                 /* multi-line comment ending on same line */
 463                                                 c += 2;
 464                                                 memmove(cc, c, buf + linelen + 1 - c);
 465                                                 linelen -= c - cc;
 466                                                 bufp = cc;
 467                                         } else {
 468                                                 /* multi-line comment */
 469                                                 *cc = '\0';
 470                                                 linelen = cc - buf;
 471                                                 incomment = true;
 472                                                 break;
 473                                         }
 474                                 }
 475                         } while (c != NULL || cc != NULL);
 476                 }
 477
 478                 for (l = linelen;
 479                      l > 0 && isspace((unsigned char)buf[l - 1]);
 480                      l--)
 481                         ;
 482                 buf[l] = '\0';
 483                 if (buf[0] == '\0')
 484                         continue;
 485
 486                 if (buf == line && *buf == '#') {
 487                         switch (token(buf+1, out, &skip, &unskip)) {
 488                         case T_ERR:
 489                                 free(line);
 490                                 return (1);
 491                         case T_OK:
 492                                 continue;
 493                         case T_PROCESS:
 494                                 break;
 495                         default:
 496                                 break;
 497                         }
 498                 }
 499
 500                 if (skip != 0)
 501                         continue;
 502
 503                 /*
 504                  * Setting LANG in user's calendar was an old workaround
 505                  * for 'calendar -a' being run with C locale to properly
 506                  * print user's calendars in their native languages.
 507                  * Now that 'calendar -a' does fork with setusercontext(),
 508                  * and does not run iconv(), this variable has little use.
 509                  */
 510                 if (strncmp(buf, "LANG=", 5) == 0) {
 511                         if (mylocale == NULL)
 512                                 mylocale = strdup(setlocale(LC_ALL, NULL));
 513                         setup_locale(buf + 5);
 514                         continue;
 515                 }
 516                 /* Parse special definitions: Easter, Paskha etc */
 517                 REPLACE("Easter=", 7, neaster);
 518                 REPLACE("Paskha=", 7, npaskha);
 519                 REPLACE("ChineseNewYear=", 15, ncny);
 520                 REPLACE("NewMoon=", 8, nnewmoon);
 521                 REPLACE("FullMoon=", 9, nfullmoon);
 522                 REPLACE("MarEquinox=", 11, nmarequinox);
 523                 REPLACE("SepEquinox=", 11, nsepequinox);
 524                 REPLACE("JunSolstice=", 12, njunsolstice);
 525                 REPLACE("DecSolstice=", 12, ndecsolstice);
 526                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 527                         setnsequences(buf + 9);
 528                         continue;
 529                 }
 530
 531                 /*
 532                  * If the line starts with a tab, the data has to be
 533                  * added to the previous line
 534                  */
 535                 if (buf[0] == '\t') {
 536                         for (i = 0; i < count; i++)
 537                                 event_continue(events[i], buf);
 538                         continue;
 539                 }
 540
 541                 /* Get rid of leading spaces (non-standard) */
 542                 while (isspace((unsigned char)buf[0]))
 543                         memcpy(buf, buf + 1, strlen(buf));
 544
 545                 /* No tab in the line, then not a valid line */
 546                 if ((pp = strchr(buf, '\t')) == NULL)
 547                         continue;
 548
 549                 /* Trim spaces in front of the tab */
 550                 while (isspace((unsigned char)pp[-1]))
 551                         pp--;
 552
 553                 p = *pp;
 554                 *pp = '\0';
 555                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 556                     extradata)) == 0)
 557                         continue;
 558                 *pp = p;
 559                 if (count < 0) {
 560                         /* Show error status based on return value */
 561                         if (debug)
 562                                 WARN1("Ignored: \"%s\"", buf);
 563                         if (count == -1)
 564                                 continue;
 565                         count = -count + 1;
 566                 }
 567
 568                 /* Find the last tab */
 569                 while (pp[1] == '\t')
 570                         pp++;
 571
 572                 for (i = 0; i < count; i++) {
 573                         if (debug)
 574                                 WARN1("got \"%s\"", pp);
 575                         events[i] = event_add(year[i], month[i], day[i],
 576                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 577                             extradata[i]);
 578                 }
 579         }
 580         while (skip-- > 0 || unskip-- > 0) {
 581                 cal_line++;
 582                 WARN0("Missing #endif assumed");
 583         }
 584
 585         free(line);
 586         fclose(in);
 587         if (mylocale != NULL) {
 588                 setup_locale(mylocale);
 589                 free(mylocale);
 590         }
 591
 592         return (0);
 593 }
 594
 595 void
 596 cal(void)
 597 {
 598         FILE *fpin;
 599         FILE *fpout;
 600         int i;
 601
 602         for (i = 0; i < MAXCOUNT; i++)
 603                 extradata[i] = (char *)calloc(1, 20);
 604
 605
 606         if ((fpin = opencalin()) == NULL)
 607                 return;
 608
 609         if ((fpout = opencalout()) == NULL) {
 610                 fclose(fpin);
 611                 return;
 612         }
 613
 614         if (cal_parse(fpin, fpout))
 615                 return;
 616
 617         event_print_all(fpout);
 618         closecal(fpout);
 619 }
 620
 621 FILE *
 622 opencalin(void)
 623 {
 624         struct stat sbuf;
 625         FILE *fpin;
 626
 627         /* open up calendar file */
 628         cal_file = calendarFile;
 629         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 630                 if (doall) {
 631                         if (chdir(calendarHomes[0]) != 0)
 632                                 return (NULL);
 633                         if (stat(calendarNoMail, &sbuf) == 0)
 634                                 return (NULL);
 635                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 636                                 return (NULL);
 637                 } else {
 638                         fpin = cal_fopen(calendarFile);
 639                 }
 640         }
 641         return (fpin);
 642 }
 643
 644 FILE *
 645 opencalout(void)
 646 {
 647         int fd;
 648
 649         /* not reading all calendar files, just set output to stdout */
 650         if (!doall)
 651                 return (stdout);
 652
 653         /* set output to a temporary file, so if no output don't send mail */
 654         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 655         if ((fd = mkstemp(path)) < 0)
 656                 return (NULL);
 657         return (fdopen(fd, "w+"));
 658 }
 659
 660 void
 661 closecal(FILE *fp)
 662 {
 663         struct stat sbuf;
 664         int nread, pdes[2], status;
 665         char buf[1024];
 666
 667         if (!doall)
 668                 return;
 669
 670         rewind(fp);
 671         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 672                 goto done;
 673         if (pipe(pdes) < 0)
 674                 goto done;
 675         switch (fork()) {
 676         case -1:                        /* error */
 677                 (void)close(pdes[0]);
 678                 (void)close(pdes[1]);
 679                 goto done;
 680         case 0:
 681                 /* child -- set stdin to pipe output */
 682                 if (pdes[0] != STDIN_FILENO) {
 683                         (void)dup2(pdes[0], STDIN_FILENO);
 684                         (void)close(pdes[0]);
 685                 }
 686                 (void)close(pdes[1]);
 687                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 688                     "\"Reminder Service\"", (char *)NULL);
 689                 warn(_PATH_SENDMAIL);
 690                 _exit(1);
 691         }
 692         /* parent -- write to pipe input */
 693         (void)close(pdes[0]);
 694
 695         write(pdes[1], "From: \"Reminder Service\" <", 26);
 696         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 697         write(pdes[1], ">\nTo: <", 7);
 698         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 699         write(pdes[1], ">\nSubject: ", 11);
 700         write(pdes[1], dayname, strlen(dayname));
 701         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 702
 703         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 704                 (void)write(pdes[1], buf, nread);
 705         (void)close(pdes[1]);
 706 done:   (void)fclose(fp);
 707         (void)unlink(path);
 708         while (wait(&status) >= 0);
 709 }