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