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