calendar.c revision 1.45
1 /* $NetBSD: calendar.c,v 1.45 2008/04/09 17:47:53 christos Exp $ */ 2 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 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)calendar.c 8.4 (Berkeley) 1/7/95"; 41 #endif 42 __RCSID("$NetBSD: calendar.c,v 1.45 2008/04/09 17:47:53 christos Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/wait.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <pwd.h> 56 #include <stdbool.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <time.h> 61 #include <tzfile.h> 62 #include <unistd.h> 63 64 #include "pathnames.h" 65 66 static unsigned short lookahead = 1; 67 static unsigned short weekend = 2; 68 static char *fname = NULL; 69 static char *datestr = NULL; 70 static const char *defaultnames[] = {"calendar", ".calendar", _PATH_SYSTEM_CALENDAR, NULL}; 71 static struct passwd *pw; 72 static char path[MAXPATHLEN + 1]; 73 static bool doall = false; 74 static bool cpp_restricted = false; 75 76 /* 1-based month, 0-based days, cumulative */ 77 static const int daytab[][14] = { 78 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 79 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 80 }; 81 static struct tm *tp; 82 static const int *cumdays; 83 static int offset, yrdays; 84 static char dayname[10]; 85 86 static struct iovec header[] = { 87 { __UNCONST("From: "), 6 }, 88 { NULL, 0 }, 89 { __UNCONST(" (Reminder Service)\nTo: "), 24 }, 90 { NULL, 0 }, 91 { __UNCONST("\nSubject: "), 10 }, 92 { NULL, 0 }, 93 { __UNCONST("'s Calendar\nPrecedence: bulk\n\n"), 30 }, 94 }; 95 96 static const char *days[] = { 97 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 98 }; 99 100 static const char *months[] = { 101 "jan", "feb", "mar", "apr", "may", "jun", 102 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 103 }; 104 105 static void atodays(int, char *, unsigned short *); 106 static void cal(void); 107 static void closecal(FILE *); 108 static int getday(char *); 109 static int getfield(char *, char **, int *); 110 static void getmmdd(struct tm *, char *); 111 static int getmonth(char *); 112 static bool isnow(char *); 113 static FILE *opencal(void); 114 static void settime(void); 115 static void usage(void) __dead; 116 117 int 118 main(int argc, char **argv) 119 { 120 int ch; 121 const char *caldir; 122 123 (void)setprogname(argv[0]); /* for portability */ 124 125 while ((ch = getopt(argc, argv, "-ad:f:l:w:x")) != -1) { 126 switch (ch) { 127 case '-': /* backward contemptible */ 128 case 'a': 129 if (getuid()) { 130 errno = EPERM; 131 err(EXIT_FAILURE, NULL); 132 } 133 doall = true; 134 break; 135 case 'd': 136 datestr = optarg; 137 break; 138 case 'f': 139 fname = optarg; 140 break; 141 case 'l': 142 atodays(ch, optarg, &lookahead); 143 break; 144 case 'w': 145 atodays(ch, optarg, &weekend); 146 break; 147 case 'x': 148 cpp_restricted = true; 149 break; 150 case '?': 151 default: 152 usage(); 153 } 154 } 155 argc -= optind; 156 argv += optind; 157 158 if (argc) 159 usage(); 160 161 settime(); 162 if (doall) { 163 /* 164 * XXX - This ignores the user's CALENDAR_DIR variable. 165 * Run under user's login shell? 166 */ 167 while ((pw = getpwent()) != NULL) { 168 (void)setegid(pw->pw_gid); 169 (void)seteuid(pw->pw_uid); 170 if (chdir(pw->pw_dir) != -1) 171 cal(); 172 (void)seteuid(0); 173 } 174 } else if ((caldir = getenv("CALENDAR_DIR")) != NULL) { 175 if (chdir(caldir) != -1) 176 cal(); 177 } else if ((pw = getpwuid(geteuid())) != NULL) { 178 if (chdir(pw->pw_dir) != -1) 179 cal(); 180 } 181 return 0; 182 } 183 184 static void 185 cal(void) 186 { 187 bool printing; 188 FILE *fp; 189 char *line; 190 191 if ((fp = opencal()) == NULL) 192 return; 193 printing = false; 194 while ((line = fparseln(stdin, 195 NULL, NULL, NULL, FPARSELN_UNESCCOMM)) != NULL) { 196 if (line[0] == '\0') 197 continue; 198 if (line[0] != '\t') 199 printing = isnow(line); 200 if (printing) 201 (void)fprintf(fp, "%s\n", line); 202 free(line); 203 204 } 205 closecal(fp); 206 } 207 208 static void 209 settime(void) 210 { 211 time_t now; 212 213 (void)time(&now); 214 tp = localtime(&now); 215 if (datestr) 216 getmmdd(tp, datestr); 217 218 if (isleap(tp->tm_year + TM_YEAR_BASE)) { 219 yrdays = DAYSPERLYEAR; 220 cumdays = daytab[1]; 221 } else { 222 yrdays = DAYSPERNYEAR; 223 cumdays = daytab[0]; 224 } 225 /* Friday displays Monday's events */ 226 offset = tp->tm_wday == 5 ? lookahead + weekend : lookahead; 227 header[5].iov_base = dayname; 228 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 229 } 230 231 /* 232 * Possible date formats include any combination of: 233 * 3-charmonth (January, Jan, Jan) 234 * 3-charweekday (Friday, Monday, mon.) 235 * numeric month or day (1, 2, 04) 236 * 237 * Any character may separate them, or they may not be separated. Any line, 238 * following a line that is matched, that starts with "whitespace", is shown 239 * along with the matched line. 240 */ 241 static bool 242 isnow(char *endp) 243 { 244 int day; 245 int flags; 246 int month; 247 int v1; 248 int v2; 249 250 #define F_ISMONTH 0x01 251 #define F_ISDAY 0x02 252 #define F_WILDMONTH 0x04 253 #define F_WILDDAY 0x08 254 255 flags = 0; 256 257 /* didn't recognize anything, skip it */ 258 if (!(v1 = getfield(endp, &endp, &flags))) 259 return false; 260 261 if (flags & F_ISDAY || v1 > 12) { 262 /* found a day */ 263 day = v1; 264 /* if no recognizable month, assume wildcard ('*') month */ 265 if ((month = getfield(endp, &endp, &flags)) == 0) { 266 flags |= F_ISMONTH | F_WILDMONTH; 267 month = tp->tm_mon + 1; 268 } 269 } else if (flags & F_ISMONTH) { 270 month = v1; 271 /* if no recognizable day, assume the first */ 272 if ((day = getfield(endp, &endp, &flags)) == 0) 273 day = 1; 274 } else { 275 v2 = getfield(endp, &endp, &flags); 276 if (flags & F_ISMONTH) { 277 day = v1; 278 month = v2; 279 } else { 280 /* F_ISDAY set, v2 > 12, or no way to tell */ 281 month = v1; 282 /* if no recognizable day, assume the first */ 283 day = v2 ? v2 : 1; 284 } 285 } 286 if (flags & F_WILDMONTH && flags & F_WILDDAY) 287 return true; 288 289 if (flags & F_WILDMONTH && flags & F_ISDAY && day == tp->tm_mday) 290 return true; 291 292 if (flags & F_ISMONTH && flags & F_WILDDAY && month == tp->tm_mon + 1) 293 return true; 294 295 if (flags & F_ISDAY) 296 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 297 day = cumdays[month] + day; 298 299 /* if today or today + offset days */ 300 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 301 return true; 302 303 /* if number of days left in this year + days to event in next year */ 304 if (yrdays - tp->tm_yday + day <= offset) 305 return true; 306 307 return false; 308 } 309 310 static int 311 getfield(char *p, char **endp, int *flags) 312 { 313 int val; 314 char *start; 315 char savech; 316 317 #define FLDCHAR(a) (*p != '\0' && !isdigit((unsigned char)*p) && \ 318 !isalpha((unsigned char)*p) && *p != '*') 319 320 for (/*EMPTY*/; FLDCHAR(*p); ++p) 321 continue; 322 if (*p == '*') { /* `*' is current month */ 323 if (!(*flags & F_ISMONTH)) { 324 *flags |= F_ISMONTH | F_WILDMONTH; 325 *endp = p + 1; 326 return tp->tm_mon + 1; 327 } else { 328 *flags |= F_ISDAY | F_WILDDAY; 329 *endp = p + 1; 330 return 1; 331 } 332 } 333 if (isdigit((unsigned char)*p)) { 334 val = (int)strtol(p, &p, 10); /* if 0, it's failure */ 335 for (/*EMPTY*/; FLDCHAR(*p); ++p) 336 continue; 337 *endp = p; 338 return val; 339 } 340 for (start = p; *p != '\0' && isalpha((unsigned char)*++p); /*EMPTY*/) 341 continue; 342 savech = *p; 343 *p = '\0'; 344 if ((val = getmonth(start)) != 0) 345 *flags |= F_ISMONTH; 346 else if ((val = getday(start)) != 0) 347 *flags |= F_ISDAY; 348 else { 349 *p = savech; 350 return 0; 351 } 352 for (*p = savech; FLDCHAR(*p); ++p) 353 continue; 354 *endp = p; 355 return val; 356 } 357 358 static FILE * 359 opencal(void) 360 { 361 int fd; 362 int pdes[2]; 363 const char **name; 364 365 /* open up calendar file as stdin */ 366 if (fname == NULL) { 367 for (name = defaultnames; *name != NULL; name++) { 368 if (freopen(*name, "rf", stdin) == NULL) 369 continue; 370 else 371 break; 372 } 373 if (*name == NULL) { 374 if (doall) 375 return NULL; 376 err(EXIT_FAILURE, "Cannot open calendar file"); 377 } 378 } else if (freopen(fname, "rf", stdin) == NULL) { 379 if (doall) 380 return NULL; 381 err(EXIT_FAILURE, "Cannot open `%s'", fname); 382 } 383 384 if (pipe(pdes) == -1) { 385 warn("Cannot open pipe"); 386 return NULL; 387 } 388 389 switch (fork()) { 390 case -1: 391 /* error */ 392 (void)close(pdes[0]); 393 (void)close(pdes[1]); 394 return NULL; 395 case 0: 396 /* child -- stdin already setup, set stdout to pipe input */ 397 if (pdes[1] != STDOUT_FILENO) { 398 (void)dup2(pdes[1], STDOUT_FILENO); 399 (void)close(pdes[1]); 400 } 401 (void)close(pdes[0]); 402 /* tell CPP to only open regular files */ 403 if(!cpp_restricted && setenv("CPP_RESTRICTED", "", 1) == -1) 404 err(EXIT_FAILURE, "Cannot restrict cpp"); 405 cpp_restricted = true; 406 407 (void)execl(_PATH_CPP, "cpp", "-traditional", "-P", "-I.", 408 "-I" _PATH_CALENDARS, NULL); 409 err(EXIT_FAILURE, "Cannot exec `%s'", _PATH_CPP); 410 /*NOTREACHED*/ 411 default: 412 /* parent -- set stdin to pipe output */ 413 (void)dup2(pdes[0], STDIN_FILENO); 414 (void)close(pdes[0]); 415 (void)close(pdes[1]); 416 417 /* not reading all calendar files, just set output to stdout */ 418 if (!doall) 419 return stdout; 420 421 /* 422 * Set output to a temporary file, so if no output 423 * don't send mail. 424 */ 425 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 426 if ((fd = mkstemp(path)) == -1) { 427 warn("Cannot create temporary file"); 428 return NULL; 429 } 430 return fdopen(fd, "w+"); 431 } 432 /*NOTREACHED*/ 433 } 434 435 static void 436 closecal(FILE *fp) 437 { 438 struct stat sbuf; 439 ssize_t nread; 440 int pdes[2]; 441 int status; 442 char buf[1024]; 443 444 if (!doall) 445 return; 446 447 (void)rewind(fp); 448 if (fstat(fileno(fp), &sbuf) == -1 || sbuf.st_size == 0) 449 goto done; 450 if (pipe(pdes) == -1) 451 goto done; 452 453 switch (fork()) { 454 case -1: 455 /* error */ 456 (void)close(pdes[0]); 457 (void)close(pdes[1]); 458 break; 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 (void)execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 467 "\"Reminder Service\"", "-f", "root", NULL); 468 err(EXIT_FAILURE, "Cannot exec `%s'", _PATH_SENDMAIL); 469 /*NOTREACHED*/ 470 default: 471 /* parent -- write to pipe input */ 472 (void)close(pdes[0]); 473 474 header[1].iov_base = header[3].iov_base = (void *)pw->pw_name; 475 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 476 (void)writev(pdes[1], header, 7); 477 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 478 (void)write(pdes[1], buf, (size_t)nread); 479 (void)close(pdes[1]); 480 break; 481 } 482 483 done: (void)fclose(fp); 484 (void)unlink(path); 485 while (wait(&status) != -1) 486 continue; 487 } 488 489 static int 490 getmonth(char *s) 491 { 492 const char **p; 493 494 for (p = months; *p; ++p) 495 if (strncasecmp(s, *p, 3) == 0) 496 return (int)(p - months) + 1; 497 return 0; 498 } 499 500 static int 501 getday(char *s) 502 { 503 const char **p; 504 505 for (p = days; *p; ++p) 506 if (strncasecmp(s, *p, 3) == 0) 507 return (int)(p - days) + 1; 508 return 0; 509 } 510 511 static void 512 atodays(int ch, char *arg, unsigned short *rvp) 513 { 514 int u; 515 516 u = atoi(arg); 517 if (u < 0 || u > 366) 518 warnx("-%c %d out of range 0-366, ignored.", ch, u); 519 else 520 *rvp = u; 521 } 522 523 #define todigit(x) ((x) - '0') 524 #define ATOI2(x) (todigit((x)[0]) * 10 + todigit((x)[1])) 525 #define ISDIG2(x) (isdigit((unsigned char)(x)[0]) && isdigit((unsigned char)(x)[1])) 526 527 static void 528 getmmdd(struct tm *ptm, char *ds) 529 { 530 bool ok = false; 531 struct tm ttm; 532 533 ttm = *ptm; 534 ttm.tm_isdst = -1; 535 536 if (ISDIG2(ds)) { 537 ttm.tm_mon = ATOI2(ds) - 1; 538 ds += 2; 539 } 540 if (ISDIG2(ds)) { 541 ttm.tm_mday = ATOI2(ds); 542 ds += 2; 543 ok = true; 544 } 545 if (ok) { 546 if (ISDIG2(ds) && ISDIG2(ds + 2)) { 547 ttm.tm_year = ATOI2(ds) * 100 - TM_YEAR_BASE; 548 ds += 2; 549 ttm.tm_year += ATOI2(ds); 550 } else if (ISDIG2(ds)) { 551 ttm.tm_year = ATOI2(ds); 552 if (ttm.tm_year < 69) 553 ttm.tm_year += 2000 - TM_YEAR_BASE; 554 else 555 ttm.tm_year += 1900 - TM_YEAR_BASE; 556 } 557 } 558 if (ok && mktime(&ttm) == -1) 559 ok = false; 560 561 if (ok) 562 *ptm = ttm; 563 else { 564 warnx("Can't convert `%s' to date, ignored.", ds); 565 usage(); 566 } 567 } 568 569 __dead 570 static void 571 usage(void) 572 { 573 (void)fprintf(stderr, "usage: %s [-ax] [-d MMDD[[YY]YY]" 574 " [-f fname] [-l days] [-w days]\n", getprogname()); 575 exit(1); 576 } 577
Indexes created Wed Oct 22 13:09:56 GMT 2025