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 #if 0
  33 #ifndef lint
  34 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  35 #endif
  36 #endif
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD: head/usr.bin/calendar/io.c 327117 2017-12-23 21:04:32Z eadler $");
  40
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43 #include <sys/wait.h>
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <langinfo.h>
  48 #include <locale.h>
  49 #include <pwd.h>
  50 #include <stdbool.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <stringlist.h>
  55 #include <time.h>
  56 #include <unistd.h>
  57
  58 #include "pathnames.h"
  59 #include "calendar.h"
  60
  61 enum {
  62         T_OK = 0,
  63         T_ERR,
  64         T_PROCESS,
  65 };
  66
  67 const char *calendarFile = "calendar";  /* default calendar file */
  68 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
  69 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  70
  71 static char path[MAXPATHLEN];
  72
  73 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  74 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  75
  76 static int cal_parse(FILE *in, FILE *out);
  77
  78 static StringList *definitions = NULL;
  79 static struct event *events[MAXCOUNT];
  80 static char *extradata[MAXCOUNT];
  81
  82 static void
  83 trimlr(char **buf)
  84 {
  85         char *walk = *buf;
  86         char *last;
  87
  88         while (isspace(*walk))
  89                 walk++;
  90         if (*walk != '\0') {
  91                 last = walk + strlen(walk) - 1;
  92                 while (last > walk && isspace(*last))
  93                         last--;
  94                 *(last+1) = 0;
  95         }
  96
  97         *buf = walk;
  98 }
  99
 100 static FILE *
 101 cal_fopen(const char *file)
 102 {
 103         FILE *fp;
 104         char *home = getenv("HOME");
 105         unsigned int i;
 106
 107         if (home == NULL || *home == '\0') {
 108                 warnx("Cannot get home directory");
 109                 return (NULL);
 110         }
 111
 112         if (chdir(home) != 0) {
 113                 warnx("Cannot enter home directory");
 114                 return (NULL);
 115         }
 116
 117         for (i = 0; i < nitems(calendarHomes); i++) {
 118                 if (chdir(calendarHomes[i]) != 0)
 119                         continue;
 120
 121                 if ((fp = fopen(file, "r")) != NULL)
 122                         return (fp);
 123         }
 124
 125         warnx("can't open calendar file \"%s\"", file);
 126
 127         return (NULL);
 128 }
 129
 130 static int
 131 token(char *line, FILE *out, bool *skip)
 132 {
 133         char *walk, c, a;
 134
 135         if (strncmp(line, "endif", 5) == 0) {
 136                 *skip = false;
 137                 return (T_OK);
 138         }
 139
 140         if (*skip)
 141                 return (T_OK);
 142
 143         if (strncmp(line, "include", 7) == 0) {
 144                 walk = line + 7;
 145
 146                 trimlr(&walk);
 147
 148                 if (*walk == '\0') {
 149                         warnx("Expecting arguments after #include");
 150                         return (T_ERR);
 151                 }
 152
 153                 if (*walk != '<' && *walk != '\"') {
 154                         warnx("Excecting '<' or '\"' after #include");
 155                         return (T_ERR);
 156                 }
 157
 158                 a = *walk;
 159                 walk++;
 160                 c = walk[strlen(walk) - 1];
 161
 162                 switch(c) {
 163                 case '>':
 164                         if (a != '<') {
 165                                 warnx("Unterminated include expecting '\"'");
 166                                 return (T_ERR);
 167                         }
 168                         break;
 169                 case '\"':
 170                         if (a != '\"') {
 171                                 warnx("Unterminated include expecting '>'");
 172                                 return (T_ERR);
 173                         }
 174                         break;
 175                 default:
 176                         warnx("Unterminated include expecting '%c'",
 177                             a == '<' ? '>' : '\"' );
 178                         return (T_ERR);
 179                 }
 180                 walk[strlen(walk) - 1] = '\0';
 181
 182                 if (cal_parse(cal_fopen(walk), out))
 183                         return (T_ERR);
 184
 185                 return (T_OK);
 186         }
 187
 188         if (strncmp(line, "define", 6) == 0) {
 189                 if (definitions == NULL)
 190                         definitions = sl_init();
 191                 walk = line + 6;
 192                 trimlr(&walk);
 193
 194                 if (*walk == '\0') {
 195                         warnx("Expecting arguments after #define");
 196                         return (T_ERR);
 197                 }
 198
 199                 sl_add(definitions, strdup(walk));
 200                 return (T_OK);
 201         }
 202
 203         if (strncmp(line, "ifndef", 6) == 0) {
 204                 walk = line + 6;
 205                 trimlr(&walk);
 206
 207                 if (*walk == '\0') {
 208                         warnx("Expecting arguments after #ifndef");
 209                         return (T_ERR);
 210                 }
 211
 212                 if (definitions != NULL && sl_find(definitions, walk) != NULL)
 213                         *skip = true;
 214
 215                 return (T_OK);
 216         }
 217
 218         return (T_PROCESS);
 219
 220 }
 221
 222 #define REPLACE(string, slen, struct_) \
 223                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 224                         if (struct_.name != NULL)                             \
 225                                 free(struct_.name);                           \
 226                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 227                                 errx(1, "cannot allocate memory");            \
 228                         struct_.len = strlen(buf + (slen));                   \
 229                         continue;                                             \
 230                 }
 231 static int
 232 cal_parse(FILE *in, FILE *out)
 233 {
 234         char *line = NULL;
 235         char *buf;
 236         size_t linecap = 0;
 237         ssize_t linelen;
 238         ssize_t l;
 239         static int d_first = -1;
 240         static int count = 0;
 241         int i;
 242         int month[MAXCOUNT];
 243         int day[MAXCOUNT];
 244         int year[MAXCOUNT];
 245         bool skip = false;
 246         char dbuf[80];
 247         char *pp, p;
 248         struct tm tm;
 249         int flags;
 250
 251         /* Unused */
 252         tm.tm_sec = 0;
 253         tm.tm_min = 0;
 254         tm.tm_hour = 0;
 255         tm.tm_wday = 0;
 256
 257         if (in == NULL)
 258                 return (1);
 259
 260         while ((linelen = getline(&line, &linecap, in)) > 0) {
 261                 if (*line == '#') {
 262                         switch (token(line+1, out, &skip)) {
 263                         case T_ERR:
 264                                 free(line);
 265                                 return (1);
 266                         case T_OK:
 267                                 continue;
 268                         case T_PROCESS:
 269                                 break;
 270                         default:
 271                                 break;
 272                         }
 273                 }
 274
 275                 if (skip)
 276                         continue;
 277
 278                 buf = line;
 279                 for (l = linelen;
 280                      l > 0 && isspace((unsigned char)buf[l - 1]);
 281                      l--)
 282                         ;
 283                 buf[l] = '\0';
 284                 if (buf[0] == '\0')
 285                         continue;
 286
 287                 /* Parse special definitions: LANG, Easter, Paskha etc */
 288                 if (strncmp(buf, "LANG=", 5) == 0) {
 289                         (void)setlocale(LC_ALL, buf + 5);
 290                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 291                         setnnames();
 292                         continue;
 293                 }
 294                 REPLACE("Easter=", 7, neaster);
 295                 REPLACE("Paskha=", 7, npaskha);
 296                 REPLACE("ChineseNewYear=", 15, ncny);
 297                 REPLACE("NewMoon=", 8, nnewmoon);
 298                 REPLACE("FullMoon=", 9, nfullmoon);
 299                 REPLACE("MarEquinox=", 11, nmarequinox);
 300                 REPLACE("SepEquinox=", 11, nsepequinox);
 301                 REPLACE("JunSolstice=", 12, njunsolstice);
 302                 REPLACE("DecSolstice=", 12, ndecsolstice);
 303                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 304                         setnsequences(buf + 9);
 305                         continue;
 306                 }
 307
 308                 /*
 309                  * If the line starts with a tab, the data has to be
 310                  * added to the previous line
 311                  */
 312                 if (buf[0] == '\t') {
 313                         for (i = 0; i < count; i++)
 314                                 event_continue(events[i], buf);
 315                         continue;
 316                 }
 317
 318                 /* Get rid of leading spaces (non-standard) */
 319                 while (isspace((unsigned char)buf[0]))
 320                         memcpy(buf, buf + 1, strlen(buf));
 321
 322                 /* No tab in the line, then not a valid line */
 323                 if ((pp = strchr(buf, '\t')) == NULL)
 324                         continue;
 325
 326                 /* Trim spaces in front of the tab */
 327                 while (isspace((unsigned char)pp[-1]))
 328                         pp--;
 329
 330                 p = *pp;
 331                 *pp = '\0';
 332                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 333                     extradata)) == 0)
 334                         continue;
 335                 *pp = p;
 336                 if (count < 0) {
 337                         /* Show error status based on return value */
 338                         if (debug)
 339                                 fprintf(stderr, "Ignored: %s\n", buf);
 340                         if (count == -1)
 341                                 continue;
 342                         count = -count + 1;
 343                 }
 344
 345                 /* Find the last tab */
 346                 while (pp[1] == '\t')
 347                         pp++;
 348
 349                 if (d_first < 0)
 350                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 351
 352                 for (i = 0; i < count; i++) {
 353                         tm.tm_mon = month[i] - 1;
 354                         tm.tm_mday = day[i];
 355                         tm.tm_year = year[i] - 1900;
 356                         (void)strftime(dbuf, sizeof(dbuf),
 357                             d_first ? "%e %b" : "%b %e", &tm);
 358                         if (debug)
 359                                 fprintf(stderr, "got %s\n", pp);
 360                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 361                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 362                             extradata[i]);
 363                 }
 364         }
 365
 366         free(line);
 367         fclose(in);
 368
 369         return (0);
 370 }
 371
 372 void
 373 cal(void)
 374 {
 375         FILE *fpin;
 376         FILE *fpout;
 377         int i;
 378
 379         for (i = 0; i < MAXCOUNT; i++)
 380                 extradata[i] = (char *)calloc(1, 20);
 381
 382
 383         if ((fpin = opencalin()) == NULL)
 384                 return;
 385
 386         if ((fpout = opencalout()) == NULL) {
 387                 fclose(fpin);
 388                 return;
 389         }
 390
 391         if (cal_parse(fpin, fpout))
 392                 return;
 393
 394         event_print_all(fpout);
 395         closecal(fpout);
 396 }
 397
 398 FILE *
 399 opencalin(void)
 400 {
 401         struct stat sbuf;
 402         FILE *fpin;
 403
 404         /* open up calendar file */
 405         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 406                 if (doall) {
 407                         if (chdir(calendarHomes[0]) != 0)
 408                                 return (NULL);
 409                         if (stat(calendarNoMail, &sbuf) == 0)
 410                                 return (NULL);
 411                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 412                                 return (NULL);
 413                 } else {
 414                         fpin = cal_fopen(calendarFile);
 415                 }
 416         }
 417         return (fpin);
 418 }
 419
 420 FILE *
 421 opencalout(void)
 422 {
 423         int fd;
 424
 425         /* not reading all calendar files, just set output to stdout */
 426         if (!doall)
 427                 return (stdout);
 428
 429         /* set output to a temporary file, so if no output don't send mail */
 430         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 431         if ((fd = mkstemp(path)) < 0)
 432                 return (NULL);
 433         return (fdopen(fd, "w+"));
 434 }
 435
 436 void
 437 closecal(FILE *fp)
 438 {
 439         uid_t uid;
 440         struct stat sbuf;
 441         int nread, pdes[2], status;
 442         char buf[1024];
 443
 444         if (!doall)
 445                 return;
 446
 447         rewind(fp);
 448         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 449                 goto done;
 450         if (pipe(pdes) < 0)
 451                 goto done;
 452         switch (fork()) {
 453         case -1:                        /* error */
 454                 (void)close(pdes[0]);
 455                 (void)close(pdes[1]);
 456                 goto done;
 457         case 0:
 458                 /* child -- set stdin to pipe output */
 459                 if (pdes[0] != STDIN_FILENO) {
 460                         (void)dup2(pdes[0], STDIN_FILENO);
 461                         (void)close(pdes[0]);
 462                 }
 463                 (void)close(pdes[1]);
 464                 uid = geteuid();
 465                 if (setuid(getuid()) < 0) {
 466                         warnx("setuid failed");
 467                         _exit(1);
 468                 }
 469                 if (setgid(getegid()) < 0) {
 470                         warnx("setgid failed");
 471                         _exit(1);
 472                 }
 473                 if (setuid(uid) < 0) {
 474                         warnx("setuid failed");
 475                         _exit(1);
 476                 }
 477                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 478                     "\"Reminder Service\"", (char *)NULL);
 479                 warn(_PATH_SENDMAIL);
 480                 _exit(1);
 481         }
 482         /* parent -- write to pipe input */
 483         (void)close(pdes[0]);
 484
 485         write(pdes[1], "From: \"Reminder Service\" <", 26);
 486         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 487         write(pdes[1], ">\nTo: <", 7);
 488         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 489         write(pdes[1], ">\nSubject: ", 11);
 490         write(pdes[1], dayname, strlen(dayname));
 491         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 492
 493         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 494                 (void)write(pdes[1], buf, nread);
 495         (void)close(pdes[1]);
 496 done:   (void)fclose(fp);
 497         (void)unlink(path);
 498         while (wait(&status) >= 0);
 499 }