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