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 static const char *cal_home;
  79 static const char *cal_dir;
  80 static const char *cal_file;
  81 static int cal_line;
  82
  83 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  84 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  85
  86 static int cal_parse(FILE *in, FILE *out);
  87
  88 static StringList *definitions = NULL;
  89 static struct event *events[MAXCOUNT];
  90 static char *extradata[MAXCOUNT];
  91
  92 static void
  93 trimlr(char **buf)
  94 {
  95         char *walk = *buf;
  96         char *last;
  97
  98         while (isspace(*walk))
  99                 walk++;
 100         if (*walk != '\0') {
 101                 last = walk + strlen(walk) - 1;
 102                 while (last > walk && isspace(*last))
 103                         last--;
 104                 *(last+1) = 0;
 105         }
 106
 107         *buf = walk;
 108 }
 109
 110 static FILE *
 111 cal_fopen(const char *file)
 112 {
 113         FILE *fp;
 114         char *home = getenv("HOME");
 115         unsigned int i;
 116         struct stat sb;
 117         static bool warned = false;
 118
 119         if (home == NULL || *home == '\0') {
 120                 warnx("Cannot get home directory");
 121                 return (NULL);
 122         }
 123
 124         if (chdir(home) != 0) {
 125                 warnx("Cannot enter home directory \"%s\"", home);
 126                 return (NULL);
 127         }
 128
 129         for (i = 0; i < nitems(calendarHomes); i++) {
 130                 if (chdir(calendarHomes[i]) != 0)
 131                         continue;
 132
 133                 if ((fp = fopen(file, "r")) != NULL) {
 134                         cal_home = home;
 135                         cal_dir = calendarHomes[i];
 136                         cal_file = file;
 137                         return (fp);
 138                 }
 139         }
 140
 141         warnx("can't open calendar file \"%s\"", file);
 142         if (!warned && stat(_PATH_INCLUDE_LOCAL, &sb) != 0) {
 143                 warnx("calendar data files now provided by calendar-data pkg.");
 144                 warned = true;
 145         }
 146
 147         return (NULL);
 148 }
 149
 150 #define WARN0(format)              \
 151         warnx(format " in %s/%s/%s line %d", cal_home, cal_dir, cal_file, cal_line)
 152 #define WARN1(format, arg1)                \
 153         warnx(format " in %s/%s/%s line %d", arg1, cal_home, cal_dir, cal_file, cal_line)
 154
 155 static int
 156 token(char *line, FILE *out, int *skip)
 157 {
 158         char *walk, c, a;
 159         const char *this_cal_home;
 160         const char *this_cal_dir;
 161         const char *this_cal_file;
 162         int this_cal_line;
 163
 164         if (strncmp(line, "endif", 5) == 0) {
 165                 if (*skip > 0)
 166                         --*skip;
 167                 return (T_OK);
 168         }
 169
 170         if (strncmp(line, "ifdef", 5) == 0) {
 171                 walk = line + 5;
 172                 trimlr(&walk);
 173
 174                 if (*walk == '\0') {
 175                         WARN0("Expecting arguments after #ifdef");
 176                         return (T_ERR);
 177                 }
 178
 179                 if (*skip != 0 || definitions == NULL || sl_find(definitions, walk) == NULL)
 180                         ++*skip;
 181
 182                 return (T_OK);
 183         }
 184
 185         if (strncmp(line, "ifndef", 6) == 0) {
 186                 walk = line + 6;
 187                 trimlr(&walk);
 188
 189                 if (*walk == '\0') {
 190                         WARN0("Expecting arguments after #ifndef");
 191                         return (T_ERR);
 192                 }
 193
 194                 if (*skip != 0 || (definitions != NULL && sl_find(definitions, walk) != NULL))
 195                         ++*skip;
 196
 197                 return (T_OK);
 198         }
 199
 200         if (strncmp(line, "else", 4) == 0) {
 201                 walk = line + 4;
 202                 trimlr(&walk);
 203
 204                 if (*walk != '\0') {
 205                         WARN0("Expecting no arguments after #else");
 206                         return (T_ERR);
 207                 }
 208
 209                 if (*skip == 0)
 210                         *skip = 1;
 211                 else if (*skip == 1)
 212                         *skip = 0;
 213
 214                 return (T_OK);
 215         }
 216
 217         if (*skip != 0)
 218                 return (T_OK);
 219
 220         if (strncmp(line, "include", 7) == 0) {
 221                 walk = line + 7;
 222
 223                 trimlr(&walk);
 224
 225                 if (*walk == '\0') {
 226                         WARN0("Expecting arguments after #include");
 227                         return (T_ERR);
 228                 }
 229
 230                 if (*walk != '<' && *walk != '\"') {
 231                         WARN0("Excecting '<' or '\"' after #include");
 232                         return (T_ERR);
 233                 }
 234
 235                 a = *walk == '<' ? '>' : '\"';
 236                 walk++;
 237                 c = walk[strlen(walk) - 1];
 238
 239                 if (a != c) {
 240                         WARN1("Unterminated include expecting '%c'", a);
 241                         return (T_ERR);
 242                 }
 243                 walk[strlen(walk) - 1] = '\0';
 244
 245                 this_cal_home = cal_home;
 246                 this_cal_dir = cal_dir;
 247                 this_cal_file = cal_file;
 248                 this_cal_line = cal_line;
 249                 if (cal_parse(cal_fopen(walk), out))
 250                         return (T_ERR);
 251                 cal_home = this_cal_home;
 252                 cal_dir = this_cal_dir;
 253                 cal_file = this_cal_file;
 254                 cal_line = this_cal_line;
 255
 256                 return (T_OK);
 257         }
 258
 259         if (strncmp(line, "define", 6) == 0) {
 260                 if (definitions == NULL)
 261                         definitions = sl_init();
 262                 walk = line + 6;
 263                 trimlr(&walk);
 264
 265                 if (*walk == '\0') {
 266                         WARN0("Expecting arguments after #define");
 267                         return (T_ERR);
 268                 }
 269
 270                 sl_add(definitions, strdup(walk));
 271                 return (T_OK);
 272         }
 273
 274         return (T_PROCESS);
 275
 276 }
 277
 278 #define REPLACE(string, slen, struct_) \
 279                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 280                         if (struct_.name != NULL)                             \
 281                                 free(struct_.name);                           \
 282                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 283                                 errx(1, "cannot allocate memory");            \
 284                         struct_.len = strlen(buf + (slen));                   \
 285                         continue;                                             \
 286                 }
 287 static int
 288 cal_parse(FILE *in, FILE *out)
 289 {
 290         char *line = NULL;
 291         char *buf;
 292         size_t linecap = 0;
 293         ssize_t linelen;
 294         ssize_t l;
 295         static int d_first = -1;
 296         static int count = 0;
 297         int i;
 298         int month[MAXCOUNT];
 299         int day[MAXCOUNT];
 300         int year[MAXCOUNT];
 301         int skip = 0;
 302         char dbuf[80];
 303         char *pp, p;
 304         struct tm tm;
 305         int flags;
 306         char *c, *cc;
 307         bool incomment = false;
 308
 309         /* Unused */
 310         tm.tm_sec = 0;
 311         tm.tm_min = 0;
 312         tm.tm_hour = 0;
 313         tm.tm_wday = 0;
 314
 315         if (in == NULL)
 316                 return (1);
 317
 318         cal_line = 0;
 319         while ((linelen = getline(&line, &linecap, in)) > 0) {
 320                 cal_line++;
 321                 buf = line;
 322                 if (buf[linelen - 1] == '\n')
 323                         buf[--linelen] = '\0';
 324
 325                 if (incomment) {
 326                         c = strstr(buf, "*/");
 327                         if (c) {
 328                                 c += 2;
 329                                 linelen -= c - buf;
 330                                 buf = c;
 331                                 incomment = false;
 332                         } else {
 333                                 continue;
 334                         }
 335                 }
 336                 if (!incomment) {
 337                         do {
 338                                 c = strstr(buf, "//");
 339                                 cc = strstr(buf, "/*");
 340                                 if (c != NULL && (cc == NULL || c - cc < 0)) {
 341                                         /* single line comment */
 342                                         *c = '\0';
 343                                         linelen = c - buf;
 344                                         break;
 345                                 } else if (cc != NULL) {
 346                                         c = strstr(cc + 2, "*/");
 347                                         if (c != NULL) {
 348                                                 /* multi-line comment ending on same line */
 349                                                 c += 2;
 350                                                 memmove(cc, c, buf + linelen + 1 - c);
 351                                                 linelen -= c - cc;
 352                                         } else {
 353                                                 /* multi-line comment */
 354                                                 *cc = '\0';
 355                                                 linelen = cc - buf;
 356                                                 incomment = true;
 357                                                 break;
 358                                         }
 359                                 }
 360                         } while (c != NULL || cc != NULL);
 361                 }
 362
 363                 for (l = linelen;
 364                      l > 0 && isspace((unsigned char)buf[l - 1]);
 365                      l--)
 366                         ;
 367                 buf[l] = '\0';
 368                 if (buf[0] == '\0')
 369                         continue;
 370
 371                 if (buf == line && *buf == '#') {
 372                         switch (token(buf+1, out, &skip)) {
 373                         case T_ERR:
 374                                 free(line);
 375                                 return (1);
 376                         case T_OK:
 377                                 continue;
 378                         case T_PROCESS:
 379                                 break;
 380                         default:
 381                                 break;
 382                         }
 383                 }
 384
 385                 if (skip != 0)
 386                         continue;
 387
 388                 /*
 389                  * Setting LANG in user's calendar was an old workaround
 390                  * for 'calendar -a' being run with C locale to properly
 391                  * print user's calendars in their native languages.
 392                  * Now that 'calendar -a' does fork with setusercontext(),
 393                  * and does not run iconv(), this variable has little use.
 394                  */
 395                 if (strncmp(buf, "LANG=", 5) == 0) {
 396                         (void)setlocale(LC_ALL, buf + 5);
 397                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 398 #ifdef WITH_ICONV
 399                         if (!doall)
 400                                 set_new_encoding();
 401 #endif
 402                         setnnames();
 403                         continue;
 404                 }
 405                 /* Parse special definitions: Easter, Paskha etc */
 406                 REPLACE("Easter=", 7, neaster);
 407                 REPLACE("Paskha=", 7, npaskha);
 408                 REPLACE("ChineseNewYear=", 15, ncny);
 409                 REPLACE("NewMoon=", 8, nnewmoon);
 410                 REPLACE("FullMoon=", 9, nfullmoon);
 411                 REPLACE("MarEquinox=", 11, nmarequinox);
 412                 REPLACE("SepEquinox=", 11, nsepequinox);
 413                 REPLACE("JunSolstice=", 12, njunsolstice);
 414                 REPLACE("DecSolstice=", 12, ndecsolstice);
 415                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 416                         setnsequences(buf + 9);
 417                         continue;
 418                 }
 419
 420                 /*
 421                  * If the line starts with a tab, the data has to be
 422                  * added to the previous line
 423                  */
 424                 if (buf[0] == '\t') {
 425                         for (i = 0; i < count; i++)
 426                                 event_continue(events[i], buf);
 427                         continue;
 428                 }
 429
 430                 /* Get rid of leading spaces (non-standard) */
 431                 while (isspace((unsigned char)buf[0]))
 432                         memcpy(buf, buf + 1, strlen(buf));
 433
 434                 /* No tab in the line, then not a valid line */
 435                 if ((pp = strchr(buf, '\t')) == NULL)
 436                         continue;
 437
 438                 /* Trim spaces in front of the tab */
 439                 while (isspace((unsigned char)pp[-1]))
 440                         pp--;
 441
 442                 p = *pp;
 443                 *pp = '\0';
 444                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 445                     extradata)) == 0)
 446                         continue;
 447                 *pp = p;
 448                 if (count < 0) {
 449                         /* Show error status based on return value */
 450                         if (debug)
 451                                 fprintf(stderr, "Ignored: \"%s\" in %s/%s/%s line %d\n",
 452                                     buf, cal_home, cal_dir, cal_file, cal_line);
 453                         if (count == -1)
 454                                 continue;
 455                         count = -count + 1;
 456                 }
 457
 458                 /* Find the last tab */
 459                 while (pp[1] == '\t')
 460                         pp++;
 461
 462                 if (d_first < 0)
 463                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 464
 465                 for (i = 0; i < count; i++) {
 466                         tm.tm_mon = month[i] - 1;
 467                         tm.tm_mday = day[i];
 468                         tm.tm_year = year[i] - 1900;
 469                         (void)strftime(dbuf, sizeof(dbuf),
 470                             d_first ? "%e %b" : "%b %e", &tm);
 471                         if (debug)
 472                                 fprintf(stderr, "got \"%s\" in  %s/%s/%s line %d\n",
 473                                     pp, cal_home, cal_dir, cal_file, cal_line);
 474                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 475                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 476                             extradata[i]);
 477                 }
 478         }
 479
 480         free(line);
 481         fclose(in);
 482
 483         return (0);
 484 }
 485
 486 void
 487 cal(void)
 488 {
 489         FILE *fpin;
 490         FILE *fpout;
 491         int i;
 492
 493         for (i = 0; i < MAXCOUNT; i++)
 494                 extradata[i] = (char *)calloc(1, 20);
 495
 496
 497         if ((fpin = opencalin()) == NULL)
 498                 return;
 499
 500         if ((fpout = opencalout()) == NULL) {
 501                 fclose(fpin);
 502                 return;
 503         }
 504
 505         if (cal_parse(fpin, fpout))
 506                 return;
 507
 508         event_print_all(fpout);
 509         closecal(fpout);
 510 }
 511
 512 FILE *
 513 opencalin(void)
 514 {
 515         struct stat sbuf;
 516         FILE *fpin;
 517
 518         /* open up calendar file */
 519         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 520                 if (doall) {
 521                         if (chdir(calendarHomes[0]) != 0)
 522                                 return (NULL);
 523                         if (stat(calendarNoMail, &sbuf) == 0)
 524                                 return (NULL);
 525                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 526                                 return (NULL);
 527                 } else {
 528                         fpin = cal_fopen(calendarFile);
 529                 }
 530         }
 531         return (fpin);
 532 }
 533
 534 FILE *
 535 opencalout(void)
 536 {
 537         int fd;
 538
 539         /* not reading all calendar files, just set output to stdout */
 540         if (!doall)
 541                 return (stdout);
 542
 543         /* set output to a temporary file, so if no output don't send mail */
 544         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 545         if ((fd = mkstemp(path)) < 0)
 546                 return (NULL);
 547         return (fdopen(fd, "w+"));
 548 }
 549
 550 void
 551 closecal(FILE *fp)
 552 {
 553         struct stat sbuf;
 554         int nread, pdes[2], status;
 555         char buf[1024];
 556
 557         if (!doall)
 558                 return;
 559
 560         rewind(fp);
 561         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 562                 goto done;
 563         if (pipe(pdes) < 0)
 564                 goto done;
 565         switch (fork()) {
 566         case -1:                        /* error */
 567                 (void)close(pdes[0]);
 568                 (void)close(pdes[1]);
 569                 goto done;
 570         case 0:
 571                 /* child -- set stdin to pipe output */
 572                 if (pdes[0] != STDIN_FILENO) {
 573                         (void)dup2(pdes[0], STDIN_FILENO);
 574                         (void)close(pdes[0]);
 575                 }
 576                 (void)close(pdes[1]);
 577                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 578                     "\"Reminder Service\"", (char *)NULL);
 579                 warn(_PATH_SENDMAIL);
 580                 _exit(1);
 581         }
 582         /* parent -- write to pipe input */
 583         (void)close(pdes[0]);
 584
 585         write(pdes[1], "From: \"Reminder Service\" <", 26);
 586         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 587         write(pdes[1], ">\nTo: <", 7);
 588         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 589         write(pdes[1], ">\nSubject: ", 11);
 590         write(pdes[1], dayname, strlen(dayname));
 591         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 592
 593         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 594                 (void)write(pdes[1], buf, nread);
 595         (void)close(pdes[1]);
 596 done:   (void)fclose(fp);
 597         (void)unlink(path);
 598         while (wait(&status) >= 0);
 599 }