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