usr.bin/calendar/io.c

   1 /*-
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1989, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  39 #endif
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/wait.h>
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <langinfo.h>
  52 #include <locale.h>
  53 #include <pwd.h>
  54 #include <stdbool.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <stringlist.h>
  59 #include <unistd.h>
  60
  61 #include "pathnames.h"
  62 #include "calendar.h"
  63
  64 enum {
  65         T_OK = 0,
  66         T_ERR,
  67         T_PROCESS,
  68 };
  69
  70 const char *calendarFile = "calendar";  /* default calendar file */
  71 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
  72 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  73
  74 static char path[MAXPATHLEN];
  75
  76 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  77 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  78
  79 static int cal_parse(FILE *in, FILE *out);
  80
  81 static StringList *definitions = NULL;
  82 static struct event *events[MAXCOUNT];
  83 static char *extradata[MAXCOUNT];
  84
  85 static void
  86 trimlr(char **buf)
  87 {
  88         char *walk = *buf;
  89         char *last;
  90
  91         while (isspace(*walk))
  92                 walk++;
  93         if (*walk != '\0') {
  94                 last = walk + strlen(walk) - 1;
  95                 while (last > walk && isspace(*last))
  96                         last--;
  97                 *(last+1) = 0;
  98         }
  99
 100         *buf = walk;
 101 }
 102
 103 static FILE *
 104 cal_fopen(const char *file)
 105 {
 106         FILE *fp;
 107         char *home = getenv("HOME");
 108         unsigned int i;
 109
 110         if (home == NULL || *home == '\0') {
 111                 warnx("Cannot get home directory");
 112                 return (NULL);
 113         }
 114
 115         if (chdir(home) != 0) {
 116                 warnx("Cannot enter home directory");
 117                 return (NULL);
 118         }
 119
 120         for (i = 0; i < nitems(calendarHomes); i++) {
 121                 if (chdir(calendarHomes[i]) != 0)
 122                         continue;
 123
 124                 if ((fp = fopen(file, "r")) != NULL)
 125                         return (fp);
 126         }
 127
 128         warnx("can't open calendar file \"%s\"", file);
 129
 130         return (NULL);
 131 }
 132
 133 static int
 134 token(char *line, FILE *out, bool *skip)
 135 {
 136         char *walk, c, a;
 137
 138         if (strncmp(line, "endif", 5) == 0) {
 139                 *skip = false;
 140                 return (T_OK);
 141         }
 142
 143         if (*skip)
 144                 return (T_OK);
 145
 146         if (strncmp(line, "include", 7) == 0) {
 147                 walk = line + 7;
 148
 149                 trimlr(&walk);
 150
 151                 if (*walk == '\0') {
 152                         warnx("Expecting arguments after #include");
 153                         return (T_ERR);
 154                 }
 155
 156                 if (*walk != '<' && *walk != '\"') {
 157                         warnx("Excecting '<' or '\"' after #include");
 158                         return (T_ERR);
 159                 }
 160
 161                 a = *walk;
 162                 walk++;
 163                 c = walk[strlen(walk) - 1];
 164
 165                 switch(c) {
 166                 case '>':
 167                         if (a != '<') {
 168                                 warnx("Unterminated include expecting '\"'");
 169                                 return (T_ERR);
 170                         }
 171                         break;
 172                 case '\"':
 173                         if (a != '\"') {
 174                                 warnx("Unterminated include expecting '>'");
 175                                 return (T_ERR);
 176                         }
 177                         break;
 178                 default:
 179                         warnx("Unterminated include expecting '%c'",
 180                             a == '<' ? '>' : '\"' );
 181                         return (T_ERR);
 182                 }
 183                 walk[strlen(walk) - 1] = '\0';
 184
 185                 if (cal_parse(cal_fopen(walk), out))
 186                         return (T_ERR);
 187
 188                 return (T_OK);
 189         }
 190
 191         if (strncmp(line, "define", 6) == 0) {
 192                 if (definitions == NULL)
 193                         definitions = sl_init();
 194                 walk = line + 6;
 195                 trimlr(&walk);
 196
 197                 if (*walk == '\0') {
 198                         warnx("Expecting arguments after #define");
 199                         return (T_ERR);
 200                 }
 201
 202                 sl_add(definitions, strdup(walk));
 203                 return (T_OK);
 204         }
 205
 206         if (strncmp(line, "ifndef", 6) == 0) {
 207                 walk = line + 6;
 208                 trimlr(&walk);
 209
 210                 if (*walk == '\0') {
 211                         warnx("Expecting arguments after #ifndef");
 212                         return (T_ERR);
 213                 }
 214
 215                 if (definitions != NULL && sl_find(definitions, walk) != NULL)
 216                         *skip = true;
 217
 218                 return (T_OK);
 219         }
 220
 221         return (T_PROCESS);
 222
 223 }
 224
 225 #define REPLACE(string, slen, struct_) \
 226                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 227                         if (struct_.name != NULL)                             \
 228                                 free(struct_.name);                           \
 229                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 230                                 errx(1, "cannot allocate memory");            \
 231                         struct_.len = strlen(buf + (slen));                   \
 232                         continue;                                             \
 233                 }
 234 static int
 235 cal_parse(FILE *in, FILE *out)
 236 {
 237         char *line = NULL;
 238         char *buf;
 239         size_t linecap = 0;
 240         ssize_t linelen;
 241         ssize_t l;
 242         static int d_first = -1;
 243         static int count = 0;
 244         int i;
 245         int month[MAXCOUNT];
 246         int day[MAXCOUNT];
 247         int year[MAXCOUNT];
 248         bool skip = false;
 249         char dbuf[80];
 250         char *pp, p;
 251         struct tm tm;
 252         int flags;
 253
 254         /* Unused */
 255         tm.tm_sec = 0;
 256         tm.tm_min = 0;
 257         tm.tm_hour = 0;
 258         tm.tm_wday = 0;
 259
 260         if (in == NULL)
 261                 return (1);
 262
 263         while ((linelen = getline(&line, &linecap, in)) > 0) {
 264                 if (*line == '#') {
 265                         switch (token(line+1, out, &skip)) {
 266                         case T_ERR:
 267                                 free(line);
 268                                 return (1);
 269                         case T_OK:
 270                                 continue;
 271                         case T_PROCESS:
 272                                 break;
 273                         default:
 274                                 break;
 275                         }
 276                 }
 277
 278                 if (skip)
 279                         continue;
 280
 281                 buf = line;
 282                 for (l = linelen;
 283                      l > 0 && isspace((unsigned char)buf[l - 1]);
 284                      l--)
 285                         ;
 286                 buf[l] = '\0';
 287                 if (buf[0] == '\0')
 288                         continue;
 289
 290                 /* Parse special definitions: LANG, Easter, Paskha etc */
 291                 if (strncmp(buf, "LANG=", 5) == 0) {
 292                         (void)setlocale(LC_ALL, buf + 5);
 293                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 294                         setnnames();
 295                         continue;
 296                 }
 297                 REPLACE("Easter=", 7, neaster);
 298                 REPLACE("Paskha=", 7, npaskha);
 299                 REPLACE("ChineseNewYear=", 15, ncny);
 300                 REPLACE("NewMoon=", 8, nnewmoon);
 301                 REPLACE("FullMoon=", 9, nfullmoon);
 302                 REPLACE("MarEquinox=", 11, nmarequinox);
 303                 REPLACE("SepEquinox=", 11, nsepequinox);
 304                 REPLACE("JunSolstice=", 12, njunsolstice);
 305                 REPLACE("DecSolstice=", 12, ndecsolstice);
 306                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 307                         setnsequences(buf + 9);
 308                         continue;
 309                 }
 310
 311                 /*
 312                  * If the line starts with a tab, the data has to be
 313                  * added to the previous line
 314                  */
 315                 if (buf[0] == '\t') {
 316                         for (i = 0; i < count; i++)
 317                                 event_continue(events[i], buf);
 318                         continue;
 319                 }
 320
 321                 /* Get rid of leading spaces (non-standard) */
 322                 while (isspace((unsigned char)buf[0]))
 323                         memcpy(buf, buf + 1, strlen(buf));
 324
 325                 /* No tab in the line, then not a valid line */
 326                 if ((pp = strchr(buf, '\t')) == NULL)
 327                         continue;
 328
 329                 /* Trim spaces in front of the tab */
 330                 while (isspace((unsigned char)pp[-1]))
 331                         pp--;
 332
 333                 p = *pp;
 334                 *pp = '\0';
 335                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 336                     extradata)) == 0)
 337                         continue;
 338                 *pp = p;
 339                 if (count < 0) {
 340                         /* Show error status based on return value */
 341                         if (debug)
 342                                 fprintf(stderr, "Ignored: %s\n", buf);
 343                         if (count == -1)
 344                                 continue;
 345                         count = -count + 1;
 346                 }
 347
 348                 /* Find the last tab */
 349                 while (pp[1] == '\t')
 350                         pp++;
 351
 352                 if (d_first < 0)
 353                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 354
 355                 for (i = 0; i < count; i++) {
 356                         tm.tm_mon = month[i] - 1;
 357                         tm.tm_mday = day[i];
 358                         tm.tm_year = year[i] - 1900;
 359                         (void)strftime(dbuf, sizeof(dbuf),
 360                             d_first ? "%e %b" : "%b %e", &tm);
 361                         if (debug)
 362                                 fprintf(stderr, "got %s\n", pp);
 363                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 364                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 365                             extradata[i]);
 366                 }
 367         }
 368
 369         free(line);
 370         fclose(in);
 371
 372         return (0);
 373 }
 374
 375 void
 376 cal(void)
 377 {
 378         FILE *fpin;
 379         FILE *fpout;
 380         int i;
 381
 382         for (i = 0; i < MAXCOUNT; i++)
 383                 extradata[i] = (char *)calloc(1, 20);
 384
 385
 386         if ((fpin = opencalin()) == NULL)
 387                 return;
 388
 389         if ((fpout = opencalout()) == NULL) {
 390                 fclose(fpin);
 391                 return;
 392         }
 393
 394         if (cal_parse(fpin, fpout))
 395                 return;
 396
 397         event_print_all(fpout);
 398         closecal(fpout);
 399 }
 400
 401 FILE *
 402 opencalin(void)
 403 {
 404         struct stat sbuf;
 405         FILE *fpin;
 406
 407         /* open up calendar file */
 408         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 409                 if (doall) {
 410                         if (chdir(calendarHomes[0]) != 0)
 411                                 return (NULL);
 412                         if (stat(calendarNoMail, &sbuf) == 0)
 413                                 return (NULL);
 414                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 415                                 return (NULL);
 416                 } else {
 417                         fpin = cal_fopen(calendarFile);
 418                 }
 419         }
 420         return (fpin);
 421 }
 422
 423 FILE *
 424 opencalout(void)
 425 {
 426         int fd;
 427
 428         /* not reading all calendar files, just set output to stdout */
 429         if (!doall)
 430                 return (stdout);
 431
 432         /* set output to a temporary file, so if no output don't send mail */
 433         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 434         if ((fd = mkstemp(path)) < 0)
 435                 return (NULL);
 436         return (fdopen(fd, "w+"));
 437 }
 438
 439 void
 440 closecal(FILE *fp)
 441 {
 442         uid_t uid;
 443         struct stat sbuf;
 444         int nread, pdes[2], status;
 445         char buf[1024];
 446
 447         if (!doall)
 448                 return;
 449
 450         rewind(fp);
 451         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 452                 goto done;
 453         if (pipe(pdes) < 0)
 454                 goto done;
 455         switch (fork()) {
 456         case -1:                        /* error */
 457                 (void)close(pdes[0]);
 458                 (void)close(pdes[1]);
 459                 goto done;
 460         case 0:
 461                 /* child -- set stdin to pipe output */
 462                 if (pdes[0] != STDIN_FILENO) {
 463                         (void)dup2(pdes[0], STDIN_FILENO);
 464                         (void)close(pdes[0]);
 465                 }
 466                 (void)close(pdes[1]);
 467                 uid = geteuid();
 468                 if (setuid(getuid()) < 0) {
 469                         warnx("setuid failed");
 470                         _exit(1);
 471                 }
 472                 if (setgid(getegid()) < 0) {
 473                         warnx("setgid failed");
 474                         _exit(1);
 475                 }
 476                 if (setuid(uid) < 0) {
 477                         warnx("setuid failed");
 478                         _exit(1);
 479                 }
 480                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 481                     "\"Reminder Service\"", (char *)NULL);
 482                 warn(_PATH_SENDMAIL);
 483                 _exit(1);
 484         }
 485         /* parent -- write to pipe input */
 486         (void)close(pdes[0]);
 487
 488         write(pdes[1], "From: \"Reminder Service\" <", 26);
 489         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 490         write(pdes[1], ">\nTo: <", 7);
 491         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 492         write(pdes[1], ">\nSubject: ", 11);
 493         write(pdes[1], dayname, strlen(dayname));
 494         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 495
 496         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 497                 (void)write(pdes[1], buf, nread);
 498         (void)close(pdes[1]);
 499 done:   (void)fclose(fp);
 500         (void)unlink(path);
 501         while (wait(&status) >= 0);
 502 }