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 (*line == '#') {
 261                         switch (token(line+1, out, &skip)) {
 262                         case T_ERR:
 263                                 free(line);
 264                                 return (1);
 265                         case T_OK:
 266                                 continue;
 267                         case T_PROCESS:
 268                                 break;
 269                         default:
 270                                 break;
 271                         }
 272                 }
 273
 274                 if (skip)
 275                         continue;
 276
 277                 buf = line;
 278                 for (l = linelen;
 279                      l > 0 && isspace((unsigned char)buf[l - 1]);
 280                      l--)
 281                         ;
 282                 buf[l] = '\0';
 283                 if (buf[0] == '\0')
 284                         continue;
 285
 286                 /* Parse special definitions: LANG, Easter, Paskha etc */
 287                 if (strncmp(buf, "LANG=", 5) == 0) {
 288                         (void)setlocale(LC_ALL, buf + 5);
 289                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 290                         setnnames();
 291                         continue;
 292                 }
 293                 REPLACE("Easter=", 7, neaster);
 294                 REPLACE("Paskha=", 7, npaskha);
 295                 REPLACE("ChineseNewYear=", 15, ncny);
 296                 REPLACE("NewMoon=", 8, nnewmoon);
 297                 REPLACE("FullMoon=", 9, nfullmoon);
 298                 REPLACE("MarEquinox=", 11, nmarequinox);
 299                 REPLACE("SepEquinox=", 11, nsepequinox);
 300                 REPLACE("JunSolstice=", 12, njunsolstice);
 301                 REPLACE("DecSolstice=", 12, ndecsolstice);
 302                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 303                         setnsequences(buf + 9);
 304                         continue;
 305                 }
 306
 307                 /*
 308                  * If the line starts with a tab, the data has to be
 309                  * added to the previous line
 310                  */
 311                 if (buf[0] == '\t') {
 312                         for (i = 0; i < count; i++)
 313                                 event_continue(events[i], buf);
 314                         continue;
 315                 }
 316
 317                 /* Get rid of leading spaces (non-standard) */
 318                 while (isspace((unsigned char)buf[0]))
 319                         memcpy(buf, buf + 1, strlen(buf));
 320
 321                 /* No tab in the line, then not a valid line */
 322                 if ((pp = strchr(buf, '\t')) == NULL)
 323                         continue;
 324
 325                 /* Trim spaces in front of the tab */
 326                 while (isspace((unsigned char)pp[-1]))
 327                         pp--;
 328
 329                 p = *pp;
 330                 *pp = '\0';
 331                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 332                     extradata)) == 0)
 333                         continue;
 334                 *pp = p;
 335                 if (count < 0) {
 336                         /* Show error status based on return value */
 337                         if (debug)
 338                                 fprintf(stderr, "Ignored: %s\n", buf);
 339                         if (count == -1)
 340                                 continue;
 341                         count = -count + 1;
 342                 }
 343
 344                 /* Find the last tab */
 345                 while (pp[1] == '\t')
 346                         pp++;
 347
 348                 if (d_first < 0)
 349                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 350
 351                 for (i = 0; i < count; i++) {
 352                         tm.tm_mon = month[i] - 1;
 353                         tm.tm_mday = day[i];
 354                         tm.tm_year = year[i] - 1900;
 355                         (void)strftime(dbuf, sizeof(dbuf),
 356                             d_first ? "%e %b" : "%b %e", &tm);
 357                         if (debug)
 358                                 fprintf(stderr, "got %s\n", pp);
 359                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 360                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 361                             extradata[i]);
 362                 }
 363         }
 364
 365         free(line);
 366         fclose(in);
 367
 368         return (0);
 369 }
 370
 371 void
 372 cal(void)
 373 {
 374         FILE *fpin;
 375         FILE *fpout;
 376         int i;
 377
 378         for (i = 0; i < MAXCOUNT; i++)
 379                 extradata[i] = (char *)calloc(1, 20);
 380
 381
 382         if ((fpin = opencalin()) == NULL)
 383                 return;
 384
 385         if ((fpout = opencalout()) == NULL) {
 386                 fclose(fpin);
 387                 return;
 388         }
 389
 390         if (cal_parse(fpin, fpout))
 391                 return;
 392
 393         event_print_all(fpout);
 394         closecal(fpout);
 395 }
 396
 397 FILE *
 398 opencalin(void)
 399 {
 400         struct stat sbuf;
 401         FILE *fpin;
 402
 403         /* open up calendar file */
 404         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 405                 if (doall) {
 406                         if (chdir(calendarHomes[0]) != 0)
 407                                 return (NULL);
 408                         if (stat(calendarNoMail, &sbuf) == 0)
 409                                 return (NULL);
 410                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 411                                 return (NULL);
 412                 } else {
 413                         fpin = cal_fopen(calendarFile);
 414                 }
 415         }
 416         return (fpin);
 417 }
 418
 419 FILE *
 420 opencalout(void)
 421 {
 422         int fd;
 423
 424         /* not reading all calendar files, just set output to stdout */
 425         if (!doall)
 426                 return (stdout);
 427
 428         /* set output to a temporary file, so if no output don't send mail */
 429         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 430         if ((fd = mkstemp(path)) < 0)
 431                 return (NULL);
 432         return (fdopen(fd, "w+"));
 433 }
 434
 435 void
 436 closecal(FILE *fp)
 437 {
 438         uid_t uid;
 439         struct stat sbuf;
 440         int nread, pdes[2], status;
 441         char buf[1024];
 442
 443         if (!doall)
 444                 return;
 445
 446         rewind(fp);
 447         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 448                 goto done;
 449         if (pipe(pdes) < 0)
 450                 goto done;
 451         switch (fork()) {
 452         case -1:                        /* error */
 453                 (void)close(pdes[0]);
 454                 (void)close(pdes[1]);
 455                 goto done;
 456         case 0:
 457                 /* child -- set stdin to pipe output */
 458                 if (pdes[0] != STDIN_FILENO) {
 459                         (void)dup2(pdes[0], STDIN_FILENO);
 460                         (void)close(pdes[0]);
 461                 }
 462                 (void)close(pdes[1]);
 463                 uid = geteuid();
 464                 if (setuid(getuid()) < 0) {
 465                         warnx("setuid failed");
 466                         _exit(1);
 467                 };
 468                 if (setgid(getegid()) < 0) {
 469                         warnx("setgid failed");
 470                         _exit(1);
 471                 }
 472                 if (setuid(uid) < 0) {
 473                         warnx("setuid failed");
 474                         _exit(1);
 475                 }
 476                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 477                     "\"Reminder Service\"", (char *)NULL);
 478                 warn(_PATH_SENDMAIL);
 479                 _exit(1);
 480         }
 481         /* parent -- write to pipe input */
 482         (void)close(pdes[0]);
 483
 484         write(pdes[1], "From: \"Reminder Service\" <", 26);
 485         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 486         write(pdes[1], ">\nTo: <", 7);
 487         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 488         write(pdes[1], ">\nSubject: ", 11);
 489         write(pdes[1], dayname, strlen(dayname));
 490         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 491
 492         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 493                 (void)write(pdes[1], buf, nread);
 494         (void)close(pdes[1]);
 495 done:   (void)fclose(fp);
 496         (void)unlink(path);
 497         while (wait(&status) >= 0);
 498 }