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 #define _WITH_GETLINE
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <stringlist.h>
  60 #include <time.h>
  61 #include <unistd.h>
  62
  63 #include "pathnames.h"
  64 #include "calendar.h"
  65
  66 enum {
  67         T_OK = 0,
  68         T_ERR,
  69         T_PROCESS,
  70 };
  71
  72 const char *calendarFile = "calendar";  /* default calendar file */
  73 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
  74 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  75
  76 static char path[MAXPATHLEN];
  77
  78 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  79 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  80
  81 static int cal_parse(FILE *in, FILE *out);
  82
  83 static StringList *definitions = NULL;
  84 static struct event *events[MAXCOUNT];
  85 static char *extradata[MAXCOUNT];
  86
  87 static void
  88 trimlr(char **buf)
  89 {
  90         char *walk = *buf;
  91         char *last;
  92
  93         while (isspace(*walk))
  94                 walk++;
  95         if (*walk != '\0') {
  96                 last = walk + strlen(walk) - 1;
  97                 while (last > walk && isspace(*last))
  98                         last--;
  99                 *(last+1) = 0;
 100         }
 101
 102         *buf = walk;
 103 }
 104
 105 static FILE *
 106 cal_fopen(const char *file)
 107 {
 108         FILE *fp;
 109         char *home = getenv("HOME");
 110         unsigned int i;
 111
 112         if (home == NULL || *home == '\0') {
 113                 warnx("Cannot get home directory");
 114                 return (NULL);
 115         }
 116
 117         if (chdir(home) != 0) {
 118                 warnx("Cannot enter home directory");
 119                 return (NULL);
 120         }
 121
 122         for (i = 0; i < nitems(calendarHomes); i++) {
 123                 if (chdir(calendarHomes[i]) != 0)
 124                         continue;
 125
 126                 if ((fp = fopen(file, "r")) != NULL)
 127                         return (fp);
 128         }
 129
 130         warnx("can't open calendar file \"%s\"", file);
 131
 132         return (NULL);
 133 }
 134
 135 static int
 136 token(char *line, FILE *out, bool *skip)
 137 {
 138         char *walk, c, a;
 139
 140         if (strncmp(line, "endif", 5) == 0) {
 141                 *skip = false;
 142                 return (T_OK);
 143         }
 144
 145         if (*skip)
 146                 return (T_OK);
 147
 148         if (strncmp(line, "include", 7) == 0) {
 149                 walk = line + 7;
 150
 151                 trimlr(&walk);
 152
 153                 if (*walk == '\0') {
 154                         warnx("Expecting arguments after #include");
 155                         return (T_ERR);
 156                 }
 157
 158                 if (*walk != '<' && *walk != '\"') {
 159                         warnx("Excecting '<' or '\"' after #include");
 160                         return (T_ERR);
 161                 }
 162
 163                 a = *walk;
 164                 walk++;
 165                 c = walk[strlen(walk) - 1];
 166
 167                 switch(c) {
 168                 case '>':
 169                         if (a != '<') {
 170                                 warnx("Unterminated include expecting '\"'");
 171                                 return (T_ERR);
 172                         }
 173                         break;
 174                 case '\"':
 175                         if (a != '\"') {
 176                                 warnx("Unterminated include expecting '>'");
 177                                 return (T_ERR);
 178                         }
 179                         break;
 180                 default:
 181                         warnx("Unterminated include expecting '%c'",
 182                             a == '<' ? '>' : '\"' );
 183                         return (T_ERR);
 184                 }
 185                 walk[strlen(walk) - 1] = '\0';
 186
 187                 if (cal_parse(cal_fopen(walk), out))
 188                         return (T_ERR);
 189
 190                 return (T_OK);
 191         }
 192
 193         if (strncmp(line, "define", 6) == 0) {
 194                 if (definitions == NULL)
 195                         definitions = sl_init();
 196                 walk = line + 6;
 197                 trimlr(&walk);
 198
 199                 if (*walk == '\0') {
 200                         warnx("Expecting arguments after #define");
 201                         return (T_ERR);
 202                 }
 203
 204                 sl_add(definitions, strdup(walk));
 205                 return (T_OK);
 206         }
 207
 208         if (strncmp(line, "ifndef", 6) == 0) {
 209                 walk = line + 6;
 210                 trimlr(&walk);
 211
 212                 if (*walk == '\0') {
 213                         warnx("Expecting arguments after #ifndef");
 214                         return (T_ERR);
 215                 }
 216
 217                 if (definitions != NULL && sl_find(definitions, walk) != NULL)
 218                         *skip = true;
 219
 220                 return (T_OK);
 221         }
 222
 223         return (T_PROCESS);
 224
 225 }
 226
 227 #define REPLACE(string, slen, struct_) \
 228                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 229                         if (struct_.name != NULL)                             \
 230                                 free(struct_.name);                           \
 231                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 232                                 errx(1, "cannot allocate memory");            \
 233                         struct_.len = strlen(buf + (slen));                   \
 234                         continue;                                             \
 235                 }
 236 static int
 237 cal_parse(FILE *in, FILE *out)
 238 {
 239         char *line = NULL;
 240         char *buf;
 241         size_t linecap = 0;
 242         ssize_t linelen;
 243         ssize_t l;
 244         static int d_first = -1;
 245         static int count = 0;
 246         int i;
 247         int month[MAXCOUNT];
 248         int day[MAXCOUNT];
 249         int year[MAXCOUNT];
 250         bool skip = false;
 251         char dbuf[80];
 252         char *pp, p;
 253         struct tm tm;
 254         int flags;
 255
 256         /* Unused */
 257         tm.tm_sec = 0;
 258         tm.tm_min = 0;
 259         tm.tm_hour = 0;
 260         tm.tm_wday = 0;
 261
 262         if (in == NULL)
 263                 return (1);
 264
 265         while ((linelen = getline(&line, &linecap, in)) > 0) {
 266                 if (*line == '#') {
 267                         switch (token(line+1, out, &skip)) {
 268                         case T_ERR:
 269                                 free(line);
 270                                 return (1);
 271                         case T_OK:
 272                                 continue;
 273                         case T_PROCESS:
 274                                 break;
 275                         default:
 276                                 break;
 277                         }
 278                 }
 279
 280                 if (skip)
 281                         continue;
 282
 283                 buf = line;
 284                 for (l = linelen;
 285                      l > 0 && isspace((unsigned char)buf[l - 1]);
 286                      l--)
 287                         ;
 288                 buf[l] = '\0';
 289                 if (buf[0] == '\0')
 290                         continue;
 291
 292                 /* Parse special definitions: LANG, Easter, Paskha etc */
 293                 if (strncmp(buf, "LANG=", 5) == 0) {
 294                         (void)setlocale(LC_ALL, buf + 5);
 295                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 296                         setnnames();
 297                         continue;
 298                 }
 299                 REPLACE("Easter=", 7, neaster);
 300                 REPLACE("Paskha=", 7, npaskha);
 301                 REPLACE("ChineseNewYear=", 15, ncny);
 302                 REPLACE("NewMoon=", 8, nnewmoon);
 303                 REPLACE("FullMoon=", 9, nfullmoon);
 304                 REPLACE("MarEquinox=", 11, nmarequinox);
 305                 REPLACE("SepEquinox=", 11, nsepequinox);
 306                 REPLACE("JunSolstice=", 12, njunsolstice);
 307                 REPLACE("DecSolstice=", 12, ndecsolstice);
 308                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 309                         setnsequences(buf + 9);
 310                         continue;
 311                 }
 312
 313                 /*
 314                  * If the line starts with a tab, the data has to be
 315                  * added to the previous line
 316                  */
 317                 if (buf[0] == '\t') {
 318                         for (i = 0; i < count; i++)
 319                                 event_continue(events[i], buf);
 320                         continue;
 321                 }
 322
 323                 /* Get rid of leading spaces (non-standard) */
 324                 while (isspace((unsigned char)buf[0]))
 325                         memcpy(buf, buf + 1, strlen(buf));
 326
 327                 /* No tab in the line, then not a valid line */
 328                 if ((pp = strchr(buf, '\t')) == NULL)
 329                         continue;
 330
 331                 /* Trim spaces in front of the tab */
 332                 while (isspace((unsigned char)pp[-1]))
 333                         pp--;
 334
 335                 p = *pp;
 336                 *pp = '\0';
 337                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 338                     extradata)) == 0)
 339                         continue;
 340                 *pp = p;
 341                 if (count < 0) {
 342                         /* Show error status based on return value */
 343                         if (debug)
 344                                 fprintf(stderr, "Ignored: %s\n", buf);
 345                         if (count == -1)
 346                                 continue;
 347                         count = -count + 1;
 348                 }
 349
 350                 /* Find the last tab */
 351                 while (pp[1] == '\t')
 352                         pp++;
 353
 354                 if (d_first < 0)
 355                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 356
 357                 for (i = 0; i < count; i++) {
 358                         tm.tm_mon = month[i] - 1;
 359                         tm.tm_mday = day[i];
 360                         tm.tm_year = year[i] - 1900;
 361                         (void)strftime(dbuf, sizeof(dbuf),
 362                             d_first ? "%e %b" : "%b %e", &tm);
 363                         if (debug)
 364                                 fprintf(stderr, "got %s\n", pp);
 365                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 366                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 367                             extradata[i]);
 368                 }
 369         }
 370
 371         free(line);
 372         fclose(in);
 373
 374         return (0);
 375 }
 376
 377 void
 378 cal(void)
 379 {
 380         FILE *fpin;
 381         FILE *fpout;
 382         int i;
 383
 384         for (i = 0; i < MAXCOUNT; i++)
 385                 extradata[i] = (char *)calloc(1, 20);
 386
 387
 388         if ((fpin = opencalin()) == NULL)
 389                 return;
 390
 391         if ((fpout = opencalout()) == NULL) {
 392                 fclose(fpin);
 393                 return;
 394         }
 395
 396         if (cal_parse(fpin, fpout))
 397                 return;
 398
 399         event_print_all(fpout);
 400         closecal(fpout);
 401 }
 402
 403 FILE *
 404 opencalin(void)
 405 {
 406         struct stat sbuf;
 407         FILE *fpin;
 408
 409         /* open up calendar file */
 410         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 411                 if (doall) {
 412                         if (chdir(calendarHomes[0]) != 0)
 413                                 return (NULL);
 414                         if (stat(calendarNoMail, &sbuf) == 0)
 415                                 return (NULL);
 416                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 417                                 return (NULL);
 418                 } else {
 419                         fpin = cal_fopen(calendarFile);
 420                 }
 421         }
 422         return (fpin);
 423 }
 424
 425 FILE *
 426 opencalout(void)
 427 {
 428         int fd;
 429
 430         /* not reading all calendar files, just set output to stdout */
 431         if (!doall)
 432                 return (stdout);
 433
 434         /* set output to a temporary file, so if no output don't send mail */
 435         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 436         if ((fd = mkstemp(path)) < 0)
 437                 return (NULL);
 438         return (fdopen(fd, "w+"));
 439 }
 440
 441 void
 442 closecal(FILE *fp)
 443 {
 444         uid_t uid;
 445         struct stat sbuf;
 446         int nread, pdes[2], status;
 447         char buf[1024];
 448
 449         if (!doall)
 450                 return;
 451
 452         rewind(fp);
 453         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 454                 goto done;
 455         if (pipe(pdes) < 0)
 456                 goto done;
 457         switch (fork()) {
 458         case -1:                        /* error */
 459                 (void)close(pdes[0]);
 460                 (void)close(pdes[1]);
 461                 goto done;
 462         case 0:
 463                 /* child -- set stdin to pipe output */
 464                 if (pdes[0] != STDIN_FILENO) {
 465                         (void)dup2(pdes[0], STDIN_FILENO);
 466                         (void)close(pdes[0]);
 467                 }
 468                 (void)close(pdes[1]);
 469                 uid = geteuid();
 470                 if (setuid(getuid()) < 0) {
 471                         warnx("setuid failed");
 472                         _exit(1);
 473                 }
 474                 if (setgid(getegid()) < 0) {
 475                         warnx("setgid failed");
 476                         _exit(1);
 477                 }
 478                 if (setuid(uid) < 0) {
 479                         warnx("setuid failed");
 480                         _exit(1);
 481                 }
 482                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 483                     "\"Reminder Service\"", (char *)NULL);
 484                 warn(_PATH_SENDMAIL);
 485                 _exit(1);
 486         }
 487         /* parent -- write to pipe input */
 488         (void)close(pdes[0]);
 489
 490         write(pdes[1], "From: \"Reminder Service\" <", 26);
 491         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 492         write(pdes[1], ">\nTo: <", 7);
 493         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 494         write(pdes[1], ">\nSubject: ", 11);
 495         write(pdes[1], dayname, strlen(dayname));
 496         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 497
 498         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 499                 (void)write(pdes[1], buf, nread);
 500         (void)close(pdes[1]);
 501 done:   (void)fclose(fp);
 502         (void)unlink(path);
 503         while (wait(&status) >= 0);
 504 }