1 /* $NetBSD: calendar.c,v 1.50 2013/11/09 15:57:15 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\ 35 The Regents of the University of California. All rights reserved."); 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 1.50 2013/11/09 15:57:15 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 /* flags used by calendar file parser */ 67 #define F_ISMONTH 0x01 68 #define F_ISDAY 0x02 69 #define F_ISDOW 0x04 70 #define F_WILDMONTH 0x10 71 #define F_WILDDAY 0x20 72 73 static unsigned short lookahead = 1; 74 static unsigned short weekend = 2; 75 static char *fname = NULL; 76 static char *datestr = NULL; 77 static const char *defaultnames[] = {"calendar", ".calendar", _PATH_SYSTEM_CALENDAR, NULL}; 78 static struct passwd *pw; 79 static char path[MAXPATHLEN + 1]; 80 static bool doall = false; 81 static bool cpp_restricted = false; 82 83 /* 1-based month, 0-based days, cumulative */ 84 static const int daytab[][14] = { 85 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 86 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 87 }; 88 static struct tm *tp; 89 static const int *cumdays; 90 static int offset, yrdays; 91 static char dayname[10]; 92 93 static struct iovec header[] = { 94 { __UNCONST("From: "), 6 }, 95 { NULL, 0 }, 96 { __UNCONST(" (Reminder Service)\nTo: "), 24 }, 97 { NULL, 0 }, 98 { __UNCONST("\nSubject: "), 10 }, 99 { NULL, 0 }, 100 { __UNCONST("'s Calendar\nPrecedence: bulk\n\n"), 30 }, 101 }; 102 103 static const char *days[] = { 104 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 105 }; 106 107 static const char *months[] = { 108 "jan", "feb", "mar", "apr", "may", "jun", 109 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 110 }; 111 112 static void atodays(int, char *, unsigned short *); 113 static void cal(void); 114 static void closecal(FILE *); 115 static int getday(char *); 116 static int getfield(char *, char **, int *); 117 static void getmmdd(struct tm *, char *); 118 static int getmonth(char *); 119 static bool isnow(char *); 120 static FILE *opencal(FILE **); 121 static void settime(void); 122 static void usage(void) __dead; 123 124 int 125 main(int argc, char **argv) 126 { 127 int ch; 128 const char *caldir; 129 130 (void)setprogname(argv[0]); /* for portability */ 131 132 while ((ch = getopt(argc, argv, "-ad:f:l:w:x")) != -1) { 133 switch (ch) { 134 case '-': /* backward contemptible */ 135 case 'a': 136 if (getuid()) { 137 errno = EPERM; 138 err(EXIT_FAILURE, NULL); 139 } 140 doall = true; 141 break; 142 case 'd': 143 datestr = optarg; 144 break; 145 case 'f': 146 fname = optarg; 147 break; 148 case 'l': 149 atodays(ch, optarg, &lookahead); 150 break; 151 case 'w': 152 atodays(ch, optarg, &weekend); 153 break; 154 case 'x': 155 cpp_restricted = true; 156 break; 157 case '?': 158 default: 159 usage(); 160 } 161 } 162 argc -= optind; 163 argv += optind; 164 165 if (argc) 166 usage(); 167 168 settime(); 169 if (doall) { 170 /* 171 * XXX - This ignores the user's CALENDAR_DIR variable. 172 * Run under user's login shell? 173 */ 174 while ((pw = getpwent()) != NULL) { 175 (void)setegid(pw->pw_gid); 176 (void)seteuid(pw->pw_uid); 177 if (chdir(pw->pw_dir) != -1) 178 cal(); 179 (void)seteuid(0); 180 } 181 } else if ((caldir = getenv("CALENDAR_DIR")) != NULL) { 182 if (chdir(caldir) != -1) 183 cal(); 184 } else if ((pw = getpwuid(geteuid())) != NULL) { 185 if (chdir(pw->pw_dir) != -1) 186 cal(); 187 } 188 return 0; 189 } 190 191 static void 192 cal(void) 193 { 194 bool printing; 195 FILE *fp, *in = NULL; 196 char *line; 197 198 if ((fp = opencal(&in)) == NULL || in == NULL) 199 return; 200 printing = false; 201 while ((line = fparseln(in, 202 NULL, NULL, NULL, FPARSELN_UNESCCOMM)) != NULL) { 203 if (line[0] == '\0') 204 continue; 205 if (line[0] != '\t') 206 printing = isnow(line); 207 if (printing) 208 (void)fprintf(fp, "%s\n", line); 209 free(line); 210 211 } 212 closecal(fp); 213 } 214 215 static void 216 settime(void) 217 { 218 time_t now; 219 220 (void)time(&now); 221 tp = localtime(&now); 222 if (datestr) 223 getmmdd(tp, datestr); 224 225 if (isleap(tp->tm_year + TM_YEAR_BASE)) { 226 yrdays = DAYSPERLYEAR; 227 cumdays = daytab[1]; 228 } else { 229 yrdays = DAYSPERNYEAR; 230 cumdays = daytab[0]; 231 } 232 /* Friday displays Monday's events */ 233 offset = tp->tm_wday == 5 ? lookahead + weekend : lookahead; 234 header[5].iov_base = dayname; 235 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 236 } 237 238 /* 239 * Possible date formats include any combination of: 240 * 3-charmonth (January, Jan, Jan) 241 * 3-charweekday (Friday, Monday, mon.) 242 * numeric month or day (1, 2, 04) 243 * 244 * Any character may separate them, or they may not be separated. Any line, 245 * following a line that is matched, that starts with "whitespace", is shown 246 * along with the matched line. 247 */ 248 static bool 249 isnow(char *endp) 250 { 251 int day; 252 int flags; 253 int month; 254 int v1; 255 int v2; 256 257 flags = 0; 258 259 /* didn't recognize anything, skip it */ 260 if (!(v1 = getfield(endp, &endp, &flags))) 261 return false; 262 263 if ((flags & (F_ISDAY|F_ISDOW)) || v1 > 12) { 264 /* found a day */ 265 day = v1; 266 /* if no recognizable month, assume wildcard ('*') month */ 267 if ((month = getfield(endp, &endp, &flags)) == 0) { 268 flags |= F_ISMONTH | F_WILDMONTH; 269 month = tp->tm_mon + 1; 270 } 271 } else if (flags & F_ISMONTH) { 272 month = v1; 273 /* if no recognizable day, assume the first */ 274 if ((day = getfield(endp, &endp, &flags)) == 0) 275 day = 1; 276 } else { 277 v2 = getfield(endp, &endp, &flags); 278 if (flags & F_ISMONTH) { 279 day = v1; 280 month = v2; 281 } else { 282 /* F_ISDAY set, v2 > 12, or no way to tell */ 283 month = v1; 284 /* if no recognizable day, assume the first */ 285 day = v2 ? v2 : 1; 286 } 287 } 288 /* if month is out of range, treat it as '*' */ 289 if (month < 1 || month > 12) { 290 flags |= F_ISMONTH | F_WILDMONTH; 291 month = tp->tm_mon + 1; 292 } 293 294 if (flags & F_WILDMONTH && flags & F_WILDDAY) 295 return true; 296 297 if (flags & F_WILDMONTH && flags & F_ISDAY && day == tp->tm_mday) 298 return true; 299 300 if (flags & F_WILDMONTH && flags & F_ISDOW && day == tp->tm_wday + 1) 301 return true; 302 303 if (flags & F_ISMONTH && flags & F_WILDDAY && month == tp->tm_mon + 1) 304 return true; 305 306 if (flags & F_ISMONTH && flags & F_ISDOW && month == tp->tm_mon + 1 && 307 day == tp->tm_wday + 1) 308 return true; 309 310 if (flags & F_ISDOW) 311 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 312 day = cumdays[month] + day; 313 314 /* if today or today + offset days */ 315 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 316 return true; 317 318 /* if number of days left in this year + days to event in next year */ 319 if (yrdays - tp->tm_yday + day <= offset) 320 return true; 321 322 return false; 323 } 324 325 static int 326 getfield(char *p, char **endp, int *flags) 327 { 328 int val; 329 char *start; 330 char savech; 331 332 /* 333 * note this macro has an arg that isn't used ... it is retained 334 * (it is believed) to make the macro call look more "natural" 335 * and suggest at the call site what is happening. 336 */ 337 #define FLDCHAR(a) (*p != '\0' && !isdigit((unsigned char)*p) && \ 338 !isalpha((unsigned char)*p) && *p != '*') 339 340 val = 0; 341 for (/*EMPTY*/; FLDCHAR(*p); ++p) 342 continue; 343 if (*p == '*') { /* `*' is current month */ 344 if (!(*flags & F_ISMONTH)) { 345 *flags |= F_ISMONTH | F_WILDMONTH; 346 *endp = p + 1; 347 return tp->tm_mon + 1; 348 } else { 349 *flags |= F_ISDAY | F_WILDDAY; 350 *endp = p + 1; 351 return 1; 352 } 353 } 354 if (isdigit((unsigned char)*p)) { 355 val = (int)strtol(p, &p, 10); /* if 0, it's failure */ 356 for (/*EMPTY*/; FLDCHAR(*p); ++p) 357 continue; 358 *endp = p; 359 return val; 360 } 361 for (start = p; *p != '\0' && isalpha((unsigned char)*p); p++) 362 continue; 363 364 savech = *p; 365 if (p != start) { 366 *p = '\0'; 367 if ((val = getmonth(start)) != 0) 368 *flags |= F_ISMONTH; 369 else if ((val = getday(start)) != 0) 370 *flags |= F_ISDOW; 371 else { 372 *p = savech; 373 *endp = start; 374 return 0; 375 } 376 } 377 for (*p = savech; FLDCHAR(*p); ++p) 378 continue; 379 *endp = p; 380 return val; 381 } 382 383 static FILE * 384 opencal(FILE **in) 385 { 386 int fd = -1; 387 int pdes[2]; 388 389 /* open up calendar file as stdin */ 390 if (fname == NULL) { 391 for (const char **name = defaultnames; *name != NULL; name++) { 392 if ((fd = open(*name, O_RDONLY)) == -1) 393 continue; 394 else 395 break; 396 } 397 if (fd == -1) { 398 if (doall) 399 return NULL; 400 err(EXIT_FAILURE, "Cannot open calendar file"); 401 } 402 } else if ((fd = open(fname, O_RDONLY)) == -1) { 403 if (doall) 404 return NULL; 405 err(EXIT_FAILURE, "Cannot open `%s'", fname); 406 } 407 408 if (pipe(pdes) == -1) { 409 warn("Cannot open pipe"); 410 return NULL; 411 } 412 413 switch (fork()) { 414 case -1: 415 /* error */ 416 (void)close(pdes[0]); 417 (void)close(pdes[1]); 418 return NULL; 419 case 0: 420 /* child */ 421 /* set stdin to calendar file */ 422 if (fd != STDIN_FILENO) { 423 (void)dup2(fd, STDIN_FILENO); 424 (void)close(fd); 425 } 426 /* set stdout to pipe input */ 427 if (pdes[1] != STDOUT_FILENO) { 428 (void)dup2(pdes[1], STDOUT_FILENO); 429 (void)close(pdes[1]); 430 } 431 (void)close(pdes[0]); 432 /* tell CPP to only open regular files */ 433 if(!cpp_restricted && setenv("CPP_RESTRICTED", "", 1) == -1) 434 err(EXIT_FAILURE, "Cannot restrict cpp"); 435 cpp_restricted = true; 436 437 (void)execl(_PATH_CPP, "cpp", "-traditional", "-P", "-I.", 438 "-I" _PATH_CALENDARS, NULL); 439 err(EXIT_FAILURE, "Cannot exec `%s'", _PATH_CPP); 440 /*NOTREACHED*/ 441 default: 442 /* parent -- fdopen *in to pipe output */ 443 *in = fdopen(pdes[0], "r"); 444 (void)close(pdes[1]); 445 446 /* close calendar file */ 447 close(fd); 448 449 /* not reading all calendar files, just set output to stdout */ 450 if (!doall) 451 return stdout; 452 453 /* 454 * Set output to a temporary file, so if no output 455 * don't send mail. 456 */ 457 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 458 if ((fd = mkstemp(path)) == -1) { 459 warn("Cannot create temporary file"); 460 return NULL; 461 } 462 return fdopen(fd, "w+"); 463 } 464 /*NOTREACHED*/ 465 } 466 467 static void 468 closecal(FILE *fp) 469 { 470 struct stat sbuf; 471 ssize_t nread; 472 int pdes[2]; 473 int status; 474 char buf[1024]; 475 476 if (!doall) 477 return; 478 479 (void)rewind(fp); 480 if (fstat(fileno(fp), &sbuf) == -1 || sbuf.st_size == 0) 481 goto done; 482 if (pipe(pdes) == -1) 483 goto done; 484 485 switch (fork()) { 486 case -1: 487 /* error */ 488 (void)close(pdes[0]); 489 (void)close(pdes[1]); 490 break; 491 case 0: 492 /* child -- set stdin to pipe output */ 493 if (pdes[0] != STDIN_FILENO) { 494 (void)dup2(pdes[0], STDIN_FILENO); 495 (void)close(pdes[0]); 496 } 497 (void)close(pdes[1]); 498 (void)execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 499 "\"Reminder Service\"", "-f", "root", NULL); 500 err(EXIT_FAILURE, "Cannot exec `%s'", _PATH_SENDMAIL); 501 /*NOTREACHED*/ 502 default: 503 /* parent -- write to pipe input */ 504 (void)close(pdes[0]); 505 506 header[1].iov_base = header[3].iov_base = (void *)pw->pw_name; 507 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 508 (void)writev(pdes[1], header, 7); 509 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 510 (void)write(pdes[1], buf, (size_t)nread); 511 (void)close(pdes[1]); 512 break; 513 } 514 515 done: (void)fclose(fp); 516 (void)unlink(path); 517 while (wait(&status) != -1) 518 continue; 519 } 520 521 static int 522 getmonth(char *s) 523 { 524 const char **p; 525 526 for (p = months; *p; ++p) 527 if (strncasecmp(s, *p, 3) == 0) 528 return (int)(p - months) + 1; 529 return 0; 530 } 531 532 static int 533 getday(char *s) 534 { 535 const char **p; 536 537 for (p = days; *p; ++p) 538 if (strncasecmp(s, *p, 3) == 0) 539 return (int)(p - days) + 1; 540 return 0; 541 } 542 543 static void 544 atodays(int ch, char *arg, unsigned short *rvp) 545 { 546 int u; 547 548 u = atoi(arg); 549 if (u < 0 || u > 366) 550 warnx("-%c %d out of range 0-366, ignored.", ch, u); 551 else 552 *rvp = u; 553 } 554 555 #define todigit(x) ((x) - '0') 556 #define ATOI2(x) (todigit((x)[0]) * 10 + todigit((x)[1])) 557 #define ISDIG2(x) (isdigit((unsigned char)(x)[0]) && isdigit((unsigned char)(x)[1])) 558 559 static void 560 getmmdd(struct tm *ptm, char *ds) 561 { 562 bool ok = false; 563 struct tm ttm; 564 565 ttm = *ptm; 566 ttm.tm_isdst = -1; 567 568 if (ISDIG2(ds)) { 569 ttm.tm_mon = ATOI2(ds) - 1; 570 ds += 2; 571 } 572 if (ISDIG2(ds)) { 573 ttm.tm_mday = ATOI2(ds); 574 ds += 2; 575 ok = true; 576 } 577 if (ok) { 578 if (ISDIG2(ds) && ISDIG2(ds + 2)) { 579 ttm.tm_year = ATOI2(ds) * 100 - TM_YEAR_BASE; 580 ds += 2; 581 ttm.tm_year += ATOI2(ds); 582 } else if (ISDIG2(ds)) { 583 ttm.tm_year = ATOI2(ds); 584 if (ttm.tm_year < 69) 585 ttm.tm_year += 2000 - TM_YEAR_BASE; 586 else 587 ttm.tm_year += 1900 - TM_YEAR_BASE; 588 } 589 } 590 if (ok && mktime(&ttm) == -1) 591 ok = false; 592 593 if (ok) 594 *ptm = ttm; 595 else { 596 warnx("Can't convert `%s' to date, ignored.", ds); 597 usage(); 598 } 599 } 600 601 __dead 602 static void 603 usage(void) 604 { 605 (void)fprintf(stderr, "usage: %s [-ax] [-d MMDD[[YY]YY]" 606 " [-f fname] [-l days] [-w days]\n", getprogname()); 607 exit(1); 608 } 609