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                 switch(c) {
 223                 case '>':
 224                         if (a != '<') {
 225                                 warnx("Unterminated include expecting '\"'");
 226                                 return (T_ERR);
 227                         }
 228                         break;
 229                 case '\"':
 230                         if (a != '\"') {
 231                                 warnx("Unterminated include expecting '>'");
 232                                 return (T_ERR);
 233                         }
 234                         break;
 235                 default:
 236                         warnx("Unterminated include expecting '%c'",
 237                             a == '<' ? '>' : '\"' );
 238                         return (T_ERR);
 239                 }
 240                 walk[strlen(walk) - 1] = '\0';
 241
 242                 if (cal_parse(cal_fopen(walk), out))
 243                         return (T_ERR);
 244
 245                 return (T_OK);
 246         }
 247
 248         if (strncmp(line, "define", 6) == 0) {
 249                 if (definitions == NULL)
 250                         definitions = sl_init();
 251                 walk = line + 6;
 252                 trimlr(&walk);
 253
 254                 if (*walk == '\0') {
 255                         warnx("Expecting arguments after #define");
 256                         return (T_ERR);
 257                 }
 258
 259                 sl_add(definitions, strdup(walk));
 260                 return (T_OK);
 261         }
 262
 263         return (T_PROCESS);
 264
 265 }
 266
 267 #define REPLACE(string, slen, struct_) \
 268                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 269                         if (struct_.name != NULL)                             \
 270                                 free(struct_.name);                           \
 271                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 272                                 errx(1, "cannot allocate memory");            \
 273                         struct_.len = strlen(buf + (slen));                   \
 274                         continue;                                             \
 275                 }
 276 static int
 277 cal_parse(FILE *in, FILE *out)
 278 {
 279         char *line = NULL;
 280         char *buf;
 281         size_t linecap = 0;
 282         ssize_t linelen;
 283         ssize_t l;
 284         static int d_first = -1;
 285         static int count = 0;
 286         int i;
 287         int month[MAXCOUNT];
 288         int day[MAXCOUNT];
 289         int year[MAXCOUNT];
 290         int skip = 0;
 291         char dbuf[80];
 292         char *pp, p;
 293         struct tm tm;
 294         int flags;
 295
 296         /* Unused */
 297         tm.tm_sec = 0;
 298         tm.tm_min = 0;
 299         tm.tm_hour = 0;
 300         tm.tm_wday = 0;
 301
 302         if (in == NULL)
 303                 return (1);
 304
 305         while ((linelen = getline(&line, &linecap, in)) > 0) {
 306                 if (*line == '#') {
 307                         switch (token(line+1, out, &skip)) {
 308                         case T_ERR:
 309                                 free(line);
 310                                 return (1);
 311                         case T_OK:
 312                                 continue;
 313                         case T_PROCESS:
 314                                 break;
 315                         default:
 316                                 break;
 317                         }
 318                 }
 319
 320                 if (skip != 0)
 321                         continue;
 322
 323                 buf = line;
 324                 for (l = linelen;
 325                      l > 0 && isspace((unsigned char)buf[l - 1]);
 326                      l--)
 327                         ;
 328                 buf[l] = '\0';
 329                 if (buf[0] == '\0')
 330                         continue;
 331
 332                 /*
 333                  * Setting LANG in user's calendar was an old workaround
 334                  * for 'calendar -a' being run with C locale to properly
 335                  * print user's calendars in their native languages.
 336                  * Now that 'calendar -a' does fork with setusercontext(),
 337                  * and does not run iconv(), this variable has little use.
 338                  */
 339                 if (strncmp(buf, "LANG=", 5) == 0) {
 340                         (void)setlocale(LC_ALL, buf + 5);
 341                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 342 #ifdef WITH_ICONV
 343                         if (!doall)
 344                                 set_new_encoding();
 345 #endif
 346                         setnnames();
 347                         continue;
 348                 }
 349                 /* Parse special definitions: Easter, Paskha etc */
 350                 REPLACE("Easter=", 7, neaster);
 351                 REPLACE("Paskha=", 7, npaskha);
 352                 REPLACE("ChineseNewYear=", 15, ncny);
 353                 REPLACE("NewMoon=", 8, nnewmoon);
 354                 REPLACE("FullMoon=", 9, nfullmoon);
 355                 REPLACE("MarEquinox=", 11, nmarequinox);
 356                 REPLACE("SepEquinox=", 11, nsepequinox);
 357                 REPLACE("JunSolstice=", 12, njunsolstice);
 358                 REPLACE("DecSolstice=", 12, ndecsolstice);
 359                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 360                         setnsequences(buf + 9);
 361                         continue;
 362                 }
 363
 364                 /*
 365                  * If the line starts with a tab, the data has to be
 366                  * added to the previous line
 367                  */
 368                 if (buf[0] == '\t') {
 369                         for (i = 0; i < count; i++)
 370                                 event_continue(events[i], buf);
 371                         continue;
 372                 }
 373
 374                 /* Get rid of leading spaces (non-standard) */
 375                 while (isspace((unsigned char)buf[0]))
 376                         memcpy(buf, buf + 1, strlen(buf));
 377
 378                 /* No tab in the line, then not a valid line */
 379                 if ((pp = strchr(buf, '\t')) == NULL)
 380                         continue;
 381
 382                 /* Trim spaces in front of the tab */
 383                 while (isspace((unsigned char)pp[-1]))
 384                         pp--;
 385
 386                 p = *pp;
 387                 *pp = '\0';
 388                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 389                     extradata)) == 0)
 390                         continue;
 391                 *pp = p;
 392                 if (count < 0) {
 393                         /* Show error status based on return value */
 394                         if (debug)
 395                                 fprintf(stderr, "Ignored: %s\n", buf);
 396                         if (count == -1)
 397                                 continue;
 398                         count = -count + 1;
 399                 }
 400
 401                 /* Find the last tab */
 402                 while (pp[1] == '\t')
 403                         pp++;
 404
 405                 if (d_first < 0)
 406                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 407
 408                 for (i = 0; i < count; i++) {
 409                         tm.tm_mon = month[i] - 1;
 410                         tm.tm_mday = day[i];
 411                         tm.tm_year = year[i] - 1900;
 412                         (void)strftime(dbuf, sizeof(dbuf),
 413                             d_first ? "%e %b" : "%b %e", &tm);
 414                         if (debug)
 415                                 fprintf(stderr, "got %s\n", pp);
 416                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 417                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 418                             extradata[i]);
 419                 }
 420         }
 421
 422         free(line);
 423         fclose(in);
 424
 425         return (0);
 426 }
 427
 428 void
 429 cal(void)
 430 {
 431         FILE *fpin;
 432         FILE *fpout;
 433         int i;
 434
 435         for (i = 0; i < MAXCOUNT; i++)
 436                 extradata[i] = (char *)calloc(1, 20);
 437
 438
 439         if ((fpin = opencalin()) == NULL)
 440                 return;
 441
 442         if ((fpout = opencalout()) == NULL) {
 443                 fclose(fpin);
 444                 return;
 445         }
 446
 447         if (cal_parse(fpin, fpout))
 448                 return;
 449
 450         event_print_all(fpout);
 451         closecal(fpout);
 452 }
 453
 454 FILE *
 455 opencalin(void)
 456 {
 457         struct stat sbuf;
 458         FILE *fpin;
 459
 460         /* open up calendar file */
 461         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 462                 if (doall) {
 463                         if (chdir(calendarHomes[0]) != 0)
 464                                 return (NULL);
 465                         if (stat(calendarNoMail, &sbuf) == 0)
 466                                 return (NULL);
 467                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 468                                 return (NULL);
 469                 } else {
 470                         fpin = cal_fopen(calendarFile);
 471                 }
 472         }
 473         return (fpin);
 474 }
 475
 476 FILE *
 477 opencalout(void)
 478 {
 479         int fd;
 480
 481         /* not reading all calendar files, just set output to stdout */
 482         if (!doall)
 483                 return (stdout);
 484
 485         /* set output to a temporary file, so if no output don't send mail */
 486         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 487         if ((fd = mkstemp(path)) < 0)
 488                 return (NULL);
 489         return (fdopen(fd, "w+"));
 490 }
 491
 492 void
 493 closecal(FILE *fp)
 494 {
 495         struct stat sbuf;
 496         int nread, pdes[2], status;
 497         char buf[1024];
 498
 499         if (!doall)
 500                 return;
 501
 502         rewind(fp);
 503         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 504                 goto done;
 505         if (pipe(pdes) < 0)
 506                 goto done;
 507         switch (fork()) {
 508         case -1:                        /* error */
 509                 (void)close(pdes[0]);
 510                 (void)close(pdes[1]);
 511                 goto done;
 512         case 0:
 513                 /* child -- set stdin to pipe output */
 514                 if (pdes[0] != STDIN_FILENO) {
 515                         (void)dup2(pdes[0], STDIN_FILENO);
 516                         (void)close(pdes[0]);
 517                 }
 518                 (void)close(pdes[1]);
 519                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 520                     "\"Reminder Service\"", (char *)NULL);
 521                 warn(_PATH_SENDMAIL);
 522                 _exit(1);
 523         }
 524         /* parent -- write to pipe input */
 525         (void)close(pdes[0]);
 526
 527         write(pdes[1], "From: \"Reminder Service\" <", 26);
 528         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 529         write(pdes[1], ">\nTo: <", 7);
 530         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 531         write(pdes[1], ">\nSubject: ", 11);
 532         write(pdes[1], dayname, strlen(dayname));
 533         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 534
 535         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 536                 (void)write(pdes[1], buf, nread);
 537         (void)close(pdes[1]);
 538 done:   (void)fclose(fp);
 539         (void)unlink(path);
 540         while (wait(&status) >= 0);
 541 }