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