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 <langinfo.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
  79 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  80 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  81
  82 static int cal_parse(FILE *in, FILE *out);
  83
  84 static StringList *definitions = NULL;
  85 static struct event *events[MAXCOUNT];
  86 static char *extradata[MAXCOUNT];
  87
  88 static void
  89 trimlr(char **buf)
  90 {
  91         char *walk = *buf;
  92         char *last;
  93
  94         while (isspace(*walk))
  95                 walk++;
  96         if (*walk != '\0') {
  97                 last = walk + strlen(walk) - 1;
  98                 while (last > walk && isspace(*last))
  99                         last--;
 100                 *(last+1) = 0;
 101         }
 102
 103         *buf = walk;
 104 }
 105
 106 static FILE *
 107 cal_fopen(const char *file)
 108 {
 109         FILE *fp;
 110         char *home = getenv("HOME");
 111         unsigned int i;
 112         struct stat sb;
 113         static bool warned = false;
 114
 115         if (home == NULL || *home == '\0') {
 116                 warnx("Cannot get home directory");
 117                 return (NULL);
 118         }
 119
 120         if (chdir(home) != 0) {
 121                 warnx("Cannot enter home directory");
 122                 return (NULL);
 123         }
 124
 125         for (i = 0; i < nitems(calendarHomes); i++) {
 126                 if (chdir(calendarHomes[i]) != 0)
 127                         continue;
 128
 129                 if ((fp = fopen(file, "r")) != NULL)
 130                         return (fp);
 131         }
 132
 133         warnx("can't open calendar file \"%s\"", file);
 134         if (!warned && stat(_PATH_INCLUDE_LOCAL, &sb) != 0) {
 135                 warnx("calendar data files now provided by calendar-data pkg.");
 136                 warned = true;
 137         }
 138
 139         return (NULL);
 140 }
 141
 142 static int
 143 token(char *line, FILE *out, int *skip)
 144 {
 145         char *walk, c, a;
 146
 147         if (strncmp(line, "endif", 5) == 0) {
 148                 if (*skip > 0)
 149                         --*skip;
 150                 return (T_OK);
 151         }
 152
 153         if (strncmp(line, "ifdef", 5) == 0) {
 154                 walk = line + 5;
 155                 trimlr(&walk);
 156
 157                 if (*walk == '\0') {
 158                         warnx("Expecting arguments after #ifdef");
 159                         return (T_ERR);
 160                 }
 161
 162                 if (*skip != 0 || definitions == NULL || sl_find(definitions, walk) == NULL)
 163                         ++*skip;
 164
 165                 return (T_OK);
 166         }
 167
 168         if (strncmp(line, "ifndef", 6) == 0) {
 169                 walk = line + 6;
 170                 trimlr(&walk);
 171
 172                 if (*walk == '\0') {
 173                         warnx("Expecting arguments after #ifndef");
 174                         return (T_ERR);
 175                 }
 176
 177                 if (*skip != 0 || (definitions != NULL && sl_find(definitions, walk) != NULL))
 178                         ++*skip;
 179
 180                 return (T_OK);
 181         }
 182
 183         if (strncmp(line, "else", 4) == 0) {
 184                 walk = line + 4;
 185                 trimlr(&walk);
 186
 187                 if (*walk != '\0') {
 188                         warnx("Expecting no arguments after #else");
 189                         return (T_ERR);
 190                 }
 191
 192                 if (*skip == 0)
 193                         *skip = 1;
 194                 else if (*skip == 1)
 195                         *skip = 0;
 196
 197                 return (T_OK);
 198         }
 199
 200         if (*skip != 0)
 201                 return (T_OK);
 202
 203         if (strncmp(line, "include", 7) == 0) {
 204                 walk = line + 7;
 205
 206                 trimlr(&walk);
 207
 208                 if (*walk == '\0') {
 209                         warnx("Expecting arguments after #include");
 210                         return (T_ERR);
 211                 }
 212
 213                 if (*walk != '<' && *walk != '\"') {
 214                         warnx("Excecting '<' or '\"' after #include");
 215                         return (T_ERR);
 216                 }
 217
 218                 a = *walk == '<' ? '>' : '\"';
 219                 walk++;
 220                 c = walk[strlen(walk) - 1];
 221
 222                 if (a != c) {
 223                         warnx("Unterminated include expecting '%c'", a);
 224                         return (T_ERR);
 225                 }
 226                 walk[strlen(walk) - 1] = '\0';
 227
 228                 if (cal_parse(cal_fopen(walk), out))
 229                         return (T_ERR);
 230
 231                 return (T_OK);
 232         }
 233
 234         if (strncmp(line, "define", 6) == 0) {
 235                 if (definitions == NULL)
 236                         definitions = sl_init();
 237                 walk = line + 6;
 238                 trimlr(&walk);
 239
 240                 if (*walk == '\0') {
 241                         warnx("Expecting arguments after #define");
 242                         return (T_ERR);
 243                 }
 244
 245                 sl_add(definitions, strdup(walk));
 246                 return (T_OK);
 247         }
 248
 249         return (T_PROCESS);
 250
 251 }
 252
 253 #define REPLACE(string, slen, struct_) \
 254                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 255                         if (struct_.name != NULL)                             \
 256                                 free(struct_.name);                           \
 257                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 258                                 errx(1, "cannot allocate memory");            \
 259                         struct_.len = strlen(buf + (slen));                   \
 260                         continue;                                             \
 261                 }
 262 static int
 263 cal_parse(FILE *in, FILE *out)
 264 {
 265         char *line = NULL;
 266         char *buf;
 267         size_t linecap = 0;
 268         ssize_t linelen;
 269         ssize_t l;
 270         static int d_first = -1;
 271         static int count = 0;
 272         int i;
 273         int month[MAXCOUNT];
 274         int day[MAXCOUNT];
 275         int year[MAXCOUNT];
 276         int skip = 0;
 277         char dbuf[80];
 278         char *pp, p;
 279         struct tm tm;
 280         int flags;
 281         char *c, *cc;
 282         bool incomment = false;
 283
 284         /* Unused */
 285         tm.tm_sec = 0;
 286         tm.tm_min = 0;
 287         tm.tm_hour = 0;
 288         tm.tm_wday = 0;
 289
 290         if (in == NULL)
 291                 return (1);
 292
 293         while ((linelen = getline(&line, &linecap, in)) > 0) {
 294                 buf = line;
 295                 if (buf[linelen - 1] == '\n')
 296                         buf[--linelen] = '\0';
 297
 298                 if (incomment) {
 299                         c = strstr(buf, "*/");
 300                         if (c) {
 301                                 c += 2;
 302                                 linelen -= c - buf;
 303                                 buf = c;
 304                                 incomment = false;
 305                         } else {
 306                                 continue;
 307                         }
 308                 }
 309                 if (!incomment) {
 310                         do {
 311                                 c = strstr(buf, "//");
 312                                 cc = strstr(buf, "/*");
 313                                 if (c != NULL && (cc == NULL || c - cc < 0)) {
 314                                         *c = '\0';
 315                                         linelen = c - buf;
 316                                         break;
 317                                 } else if (cc != NULL) {
 318                                         c = strstr(cc + 2, "*/");
 319                                         if (c != NULL) {
 320                                                 c += 2;
 321                                                 memmove(cc, c, c - buf + linelen);
 322                                                 linelen -= c - cc;
 323                                         } else {
 324                                                 *cc = '\0';
 325                                                 linelen = cc - buf;
 326                                                 incomment = true;
 327                                                 break;
 328                                         }
 329                                 }
 330                         } while (c != NULL || cc != NULL);
 331                 }
 332
 333                 for (l = linelen;
 334                      l > 0 && isspace((unsigned char)buf[l - 1]);
 335                      l--)
 336                         ;
 337                 buf[l] = '\0';
 338                 if (buf[0] == '\0')
 339                         continue;
 340
 341                 if (buf == line && *buf == '#') {
 342                         switch (token(buf+1, out, &skip)) {
 343                         case T_ERR:
 344                                 free(line);
 345                                 return (1);
 346                         case T_OK:
 347                                 continue;
 348                         case T_PROCESS:
 349                                 break;
 350                         default:
 351                                 break;
 352                         }
 353                 }
 354
 355                 if (skip != 0)
 356                         continue;
 357
 358                 /*
 359                  * Setting LANG in user's calendar was an old workaround
 360                  * for 'calendar -a' being run with C locale to properly
 361                  * print user's calendars in their native languages.
 362                  * Now that 'calendar -a' does fork with setusercontext(),
 363                  * and does not run iconv(), this variable has little use.
 364                  */
 365                 if (strncmp(buf, "LANG=", 5) == 0) {
 366                         (void)setlocale(LC_ALL, buf + 5);
 367                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 368 #ifdef WITH_ICONV
 369                         if (!doall)
 370                                 set_new_encoding();
 371 #endif
 372                         setnnames();
 373                         continue;
 374                 }
 375                 /* Parse special definitions: Easter, Paskha etc */
 376                 REPLACE("Easter=", 7, neaster);
 377                 REPLACE("Paskha=", 7, npaskha);
 378                 REPLACE("ChineseNewYear=", 15, ncny);
 379                 REPLACE("NewMoon=", 8, nnewmoon);
 380                 REPLACE("FullMoon=", 9, nfullmoon);
 381                 REPLACE("MarEquinox=", 11, nmarequinox);
 382                 REPLACE("SepEquinox=", 11, nsepequinox);
 383                 REPLACE("JunSolstice=", 12, njunsolstice);
 384                 REPLACE("DecSolstice=", 12, ndecsolstice);
 385                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 386                         setnsequences(buf + 9);
 387                         continue;
 388                 }
 389
 390                 /*
 391                  * If the line starts with a tab, the data has to be
 392                  * added to the previous line
 393                  */
 394                 if (buf[0] == '\t') {
 395                         for (i = 0; i < count; i++)
 396                                 event_continue(events[i], buf);
 397                         continue;
 398                 }
 399
 400                 /* Get rid of leading spaces (non-standard) */
 401                 while (isspace((unsigned char)buf[0]))
 402                         memcpy(buf, buf + 1, strlen(buf));
 403
 404                 /* No tab in the line, then not a valid line */
 405                 if ((pp = strchr(buf, '\t')) == NULL)
 406                         continue;
 407
 408                 /* Trim spaces in front of the tab */
 409                 while (isspace((unsigned char)pp[-1]))
 410                         pp--;
 411
 412                 p = *pp;
 413                 *pp = '\0';
 414                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 415                     extradata)) == 0)
 416                         continue;
 417                 *pp = p;
 418                 if (count < 0) {
 419                         /* Show error status based on return value */
 420                         if (debug)
 421                                 fprintf(stderr, "Ignored: %s\n", buf);
 422                         if (count == -1)
 423                                 continue;
 424                         count = -count + 1;
 425                 }
 426
 427                 /* Find the last tab */
 428                 while (pp[1] == '\t')
 429                         pp++;
 430
 431                 if (d_first < 0)
 432                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 433
 434                 for (i = 0; i < count; i++) {
 435                         tm.tm_mon = month[i] - 1;
 436                         tm.tm_mday = day[i];
 437                         tm.tm_year = year[i] - 1900;
 438                         (void)strftime(dbuf, sizeof(dbuf),
 439                             d_first ? "%e %b" : "%b %e", &tm);
 440                         if (debug)
 441                                 fprintf(stderr, "got %s\n", pp);
 442                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 443                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 444                             extradata[i]);
 445                 }
 446         }
 447
 448         free(line);
 449         fclose(in);
 450
 451         return (0);
 452 }
 453
 454 void
 455 cal(void)
 456 {
 457         FILE *fpin;
 458         FILE *fpout;
 459         int i;
 460
 461         for (i = 0; i < MAXCOUNT; i++)
 462                 extradata[i] = (char *)calloc(1, 20);
 463
 464
 465         if ((fpin = opencalin()) == NULL)
 466                 return;
 467
 468         if ((fpout = opencalout()) == NULL) {
 469                 fclose(fpin);
 470                 return;
 471         }
 472
 473         if (cal_parse(fpin, fpout))
 474                 return;
 475
 476         event_print_all(fpout);
 477         closecal(fpout);
 478 }
 479
 480 FILE *
 481 opencalin(void)
 482 {
 483         struct stat sbuf;
 484         FILE *fpin;
 485
 486         /* open up calendar file */
 487         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 488                 if (doall) {
 489                         if (chdir(calendarHomes[0]) != 0)
 490                                 return (NULL);
 491                         if (stat(calendarNoMail, &sbuf) == 0)
 492                                 return (NULL);
 493                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 494                                 return (NULL);
 495                 } else {
 496                         fpin = cal_fopen(calendarFile);
 497                 }
 498         }
 499         return (fpin);
 500 }
 501
 502 FILE *
 503 opencalout(void)
 504 {
 505         int fd;
 506
 507         /* not reading all calendar files, just set output to stdout */
 508         if (!doall)
 509                 return (stdout);
 510
 511         /* set output to a temporary file, so if no output don't send mail */
 512         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 513         if ((fd = mkstemp(path)) < 0)
 514                 return (NULL);
 515         return (fdopen(fd, "w+"));
 516 }
 517
 518 void
 519 closecal(FILE *fp)
 520 {
 521         struct stat sbuf;
 522         int nread, pdes[2], status;
 523         char buf[1024];
 524
 525         if (!doall)
 526                 return;
 527
 528         rewind(fp);
 529         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 530                 goto done;
 531         if (pipe(pdes) < 0)
 532                 goto done;
 533         switch (fork()) {
 534         case -1:                        /* error */
 535                 (void)close(pdes[0]);
 536                 (void)close(pdes[1]);
 537                 goto done;
 538         case 0:
 539                 /* child -- set stdin to pipe output */
 540                 if (pdes[0] != STDIN_FILENO) {
 541                         (void)dup2(pdes[0], STDIN_FILENO);
 542                         (void)close(pdes[0]);
 543                 }
 544                 (void)close(pdes[1]);
 545                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 546                     "\"Reminder Service\"", (char *)NULL);
 547                 warn(_PATH_SENDMAIL);
 548                 _exit(1);
 549         }
 550         /* parent -- write to pipe input */
 551         (void)close(pdes[0]);
 552
 553         write(pdes[1], "From: \"Reminder Service\" <", 26);
 554         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 555         write(pdes[1], ">\nTo: <", 7);
 556         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 557         write(pdes[1], ">\nSubject: ", 11);
 558         write(pdes[1], dayname, strlen(dayname));
 559         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 560
 561         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 562                 (void)write(pdes[1], buf, nread);
 563         (void)close(pdes[1]);
 564 done:   (void)fclose(fp);
 565         (void)unlink(path);
 566         while (wait(&status) >= 0);
 567 }