calendar.c revision 1.35
1 /* $NetBSD: calendar.c,v 1.35 2004/12/06 20:38:43 jwise 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 1.35 2004/12/06 20:38:43 jwise 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 <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <time.h> 60 #include <tzfile.h> 61 #include <unistd.h> 62 63 #include "pathnames.h" 64 65 #ifndef TRUE 66 #define TRUE 1 67 #endif 68 #ifndef FALSE 69 #define FALSE 0 70 #endif 71 72 static unsigned short lookahead = 1, weekend = 2; 73 static char *fname = NULL, *datestr = NULL; 74 static char *defaultnames[] = {"calendar", ".calendar", "/etc/calendar", NULL}; 75 static struct passwd *pw; 76 static int doall; 77 static char path[MAXPATHLEN + 1]; 78 static int cpp_restricted = 0; 79 80 /* 1-based month, 0-based days, cumulative */ 81 static int daytab[][14] = { 82 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 83 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 84 }; 85 static struct tm *tp; 86 static int *cumdays, offset, yrdays; 87 static char dayname[10]; 88 89 static struct iovec header[] = { 90 { "From: ", 6 }, 91 { NULL, 0 }, 92 { " (Reminder Service)\nTo: ", 24 }, 93 { NULL, 0 }, 94 { "\nSubject: ", 10 }, 95 { NULL, 0 }, 96 { "'s Calendar\nPrecedence: bulk\n\n", 30 }, 97 }; 98 99 static char *days[] = { 100 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 101 }; 102 103 static char *months[] = { 104 "jan", "feb", "mar", "apr", "may", "jun", 105 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 106 }; 107 108 int main(int, char **); 109 110 static void atodays(int, char *, unsigned short *); 111 static void cal(void); 112 static void closecal(FILE *); 113 static int getday(char *); 114 static int getfield(char *, char **, int *); 115 static void getmmdd(struct tm *, char *); 116 static int getmonth(char *); 117 static int isnow(char *); 118 static FILE *opencal(void); 119 static void settime(void); 120 static void usage(void) __attribute__((__noreturn__)); 121 122 int 123 main(argc, argv) 124 int argc; 125 char *argv[]; 126 { 127 int ch; 128 const char *caldir; 129 130 while ((ch = getopt(argc, argv, "-ad:f:l:w:x")) != -1) 131 switch (ch) { 132 case '-': /* backward contemptible */ 133 case 'a': 134 if (getuid()) { 135 errno = EPERM; 136 err(1, NULL); 137 } 138 doall = 1; 139 break; 140 case 'd': 141 datestr = optarg; 142 break; 143 case 'f': 144 fname = optarg; 145 break; 146 case 'l': 147 atodays(ch, optarg, &lookahead); 148 break; 149 case 'w': 150 atodays(ch, optarg, &weekend); 151 break; 152 case 'x': 153 cpp_restricted = 1; 154 case '?': 155 default: 156 usage(); 157 } 158 argc -= optind; 159 argv += optind; 160 161 if (argc) 162 usage(); 163 164 settime(); 165 if (doall) { 166 while ((pw = getpwent()) != NULL) { 167 (void)setegid(pw->pw_gid); 168 (void)seteuid(pw->pw_uid); 169 if (!chdir(pw->pw_dir)) 170 cal(); 171 (void)seteuid(0); 172 } 173 } else if ((caldir = getenv("CALENDAR_DIR")) != NULL) { 174 if(!chdir(caldir)) 175 cal(); 176 } else { 177 if (((pw = getpwuid(geteuid())) != NULL) && !chdir(pw->pw_dir)) 178 cal(); 179 } 180 exit(0); 181 } 182 183 static void 184 cal(void) 185 { 186 int printing; 187 FILE *fp; 188 char *line; 189 190 if ((fp = opencal()) == NULL) 191 return; 192 while ((line = fparseln(stdin, NULL, NULL, NULL, FPARSELN_UNESCCOMM)) 193 != NULL) { 194 if (line[0] == '\0') 195 continue; 196 if (line[0] != '\t') 197 printing = isnow(line) ? 1 : 0; 198 if (printing) 199 (void)fprintf(fp, "%s\n", line); 200 free(line); 201 202 } 203 closecal(fp); 204 } 205 206 207 static void 208 settime(void) 209 { 210 time_t now; 211 212 (void)time(&now); 213 tp = localtime(&now); 214 if (datestr) { 215 getmmdd(tp, datestr); 216 } 217 if (isleap(tp->tm_year + TM_YEAR_BASE)) { 218 yrdays = DAYSPERLYEAR; 219 cumdays = daytab[1]; 220 } else { 221 yrdays = DAYSPERNYEAR; 222 cumdays = daytab[0]; 223 } 224 /* Friday displays Monday's events */ 225 offset = tp->tm_wday == 5 ? lookahead + weekend : lookahead; 226 header[5].iov_base = dayname; 227 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 228 } 229 230 /* 231 * Possible date formats include any combination of: 232 * 3-charmonth (January, Jan, Jan) 233 * 3-charweekday (Friday, Monday, mon.) 234 * numeric month or day (1, 2, 04) 235 * 236 * Any character may separate them, or they may not be separated. Any line, 237 * following a line that is matched, that starts with "whitespace", is shown 238 * along with the matched line. 239 */ 240 static int 241 isnow(endp) 242 char *endp; 243 { 244 int day, flags, month, v1, v2; 245 246 #define F_ISMONTH 0x01 247 #define F_ISDAY 0x02 248 #define F_WILDMONTH 0x04 249 #define F_WILDDAY 0x08 250 251 flags = 0; 252 253 /* didn't recognize anything, skip it */ 254 if (!(v1 = getfield(endp, &endp, &flags))) 255 return (0); 256 if (flags & F_ISDAY || v1 > 12) { 257 /* found a day */ 258 day = v1; 259 month = tp->tm_mon + 1; 260 } else if (flags & F_ISMONTH) { 261 month = v1; 262 /* if no recognizable day, assume the first */ 263 if (!(day = getfield(endp, &endp, &flags))) 264 day = 1; 265 } else { 266 v2 = getfield(endp, &endp, &flags); 267 if (flags & F_ISMONTH) { 268 day = v1; 269 month = v2; 270 } else { 271 /* F_ISDAY set, v2 > 12, or no way to tell */ 272 month = v1; 273 /* if no recognizable day, assume the first */ 274 day = v2 ? v2 : 1; 275 } 276 } 277 278 if (flags & (F_WILDMONTH|F_WILDDAY)) 279 return (1); 280 281 if ((flags & (F_WILDMONTH|F_ISDAY)) && (day == tp->tm_mday)) 282 return (1); 283 284 if ((flags & (F_ISMONTH|F_WILDDAY)) && (month == tp->tm_mon + 1)) 285 return (1); 286 287 if (flags & F_ISDAY) 288 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 289 day = cumdays[month] + day; 290 291 /* if today or today + offset days */ 292 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 293 return (1); 294 /* if number of days left in this year + days to event in next year */ 295 if (yrdays - tp->tm_yday + day <= offset) 296 return (1); 297 return (0); 298 } 299 300 static int 301 getfield(p, endp, flags) 302 char *p, **endp; 303 int *flags; 304 { 305 int val; 306 char *start, savech; 307 308 #define FLDCHAR(a) (*p != '\0' && !isdigit((unsigned char)*p) && \ 309 !isalpha((unsigned char)*p) && *p != '*') 310 311 for (; FLDCHAR(*p); ++p) 312 continue; 313 if (*p == '*') { /* `*' is current month */ 314 if (!(*flags & F_ISMONTH)) { 315 *flags |= F_ISMONTH|F_WILDMONTH; 316 *endp = p+1; 317 return (tp->tm_mon + 1); 318 } else { 319 *flags |= F_ISDAY|F_WILDDAY; 320 *endp = p+1; 321 return (1); 322 } 323 } 324 if (isdigit((unsigned char)*p)) { 325 val = strtol(p, &p, 10); /* if 0, it's failure */ 326 for (; FLDCHAR(*p); ++p) 327 continue; 328 *endp = p; 329 return (val); 330 } 331 for (start = p; *p != '\0' && isalpha((unsigned char)*++p);) 332 continue; 333 savech = *p; 334 *p = '\0'; 335 if ((val = getmonth(start)) != 0) { 336 *flags |= F_ISMONTH; 337 } else if ((val = getday(start)) != 0) { 338 *flags |= F_ISDAY; 339 } else { 340 *p = savech; 341 return (0); 342 } 343 for (*p = savech; FLDCHAR(*p); ++p) 344 continue; 345 *endp = p; 346 return (val); 347 } 348 349 static FILE * 350 opencal(void) 351 { 352 int fd, pdes[2]; 353 char **name; 354 355 /* open up calendar file as stdin */ 356 if (fname == NULL) { 357 for (name = defaultnames; *name != NULL; name++) { 358 if (!freopen(*name, "rf", stdin)) 359 continue; 360 else 361 break; 362 } 363 if (*name == NULL) { 364 if (doall) 365 return (NULL); 366 err(1, "Cannot open calendar file"); 367 } 368 } else if (!freopen(fname, "rf", stdin)) { 369 if (doall) 370 return (NULL); 371 err(1, "Cannot open `%s'", fname); 372 } 373 374 if (pipe(pdes) < 0) { 375 warn("Cannot open pipe"); 376 return (NULL); 377 } 378 379 switch (fork()) { 380 case -1: /* error */ 381 (void)close(pdes[0]); 382 (void)close(pdes[1]); 383 return (NULL); 384 case 0: 385 /* child -- stdin already setup, set stdout to pipe input */ 386 if (pdes[1] != STDOUT_FILENO) { 387 (void)dup2(pdes[1], STDOUT_FILENO); 388 (void)close(pdes[1]); 389 } 390 (void)close(pdes[0]); 391 /* tell CPP to only open regular files */ 392 if(!cpp_restricted && setenv("CPP_RESTRICTED", "", 1)) 393 err(1, "Cannot restrict cpp"); 394 cpp_restricted = 1; 395 396 (void)execl(_PATH_CPP, "cpp", "-traditional", "-P", "-I.", 397 "-I" _PATH_CALENDARS, NULL); 398 err(1, "Cannot exec `%s'", _PATH_CPP); 399 /*NOTREACHED*/ 400 } 401 402 /* parent -- set stdin to pipe output */ 403 (void)dup2(pdes[0], STDIN_FILENO); 404 (void)close(pdes[0]); 405 (void)close(pdes[1]); 406 407 /* not reading all calendar files, just set output to stdout */ 408 if (!doall) 409 return (stdout); 410 411 /* set output to a temporary file, so if no output don't send mail */ 412 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 413 if ((fd = mkstemp(path)) < 0) { 414 warn("Cannot create temporary file"); 415 return (NULL); 416 } 417 return (fdopen(fd, "w+")); 418 } 419 420 static void 421 closecal(fp) 422 FILE *fp; 423 { 424 struct stat sbuf; 425 int nread, pdes[2], status; 426 char buf[1024]; 427 428 if (!doall) 429 return; 430 431 (void)rewind(fp); 432 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 433 goto done; 434 if (pipe(pdes) < 0) 435 goto done; 436 switch (fork()) { 437 case -1: /* error */ 438 (void)close(pdes[0]); 439 (void)close(pdes[1]); 440 goto done; 441 case 0: 442 /* child -- set stdin to pipe output */ 443 if (pdes[0] != STDIN_FILENO) { 444 (void)dup2(pdes[0], STDIN_FILENO); 445 (void)close(pdes[0]); 446 } 447 (void)close(pdes[1]); 448 (void)execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 449 "\"Reminder Service\"", "-f", "root", NULL); 450 err(1, "Cannot exec `%s'", _PATH_SENDMAIL); 451 /*NOTREACHED*/ 452 } 453 /* parent -- write to pipe input */ 454 (void)close(pdes[0]); 455 456 header[1].iov_base = header[3].iov_base = (void *)pw->pw_name; 457 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 458 writev(pdes[1], header, 7); 459 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 460 (void)write(pdes[1], buf, nread); 461 (void)close(pdes[1]); 462 463 done: (void)fclose(fp); 464 (void)unlink(path); 465 while (wait(&status) >= 0) 466 continue; 467 } 468 469 static int 470 getmonth(s) 471 char *s; 472 { 473 char **p; 474 475 for (p = months; *p; ++p) 476 if (!strncasecmp(s, *p, 3)) 477 return ((p - months) + 1); 478 return (0); 479 } 480 481 static int 482 getday(s) 483 char *s; 484 { 485 char **p; 486 487 for (p = days; *p; ++p) 488 if (!strncasecmp(s, *p, 3)) 489 return ((p - days) + 1); 490 return (0); 491 } 492 493 static void 494 atodays(int ch, char *optarg, unsigned short *days) 495 { 496 int u; 497 498 u = atoi(optarg); 499 if ((u < 0) || (u > 366)) { 500 warnx("-%c %d out of range 0-366, ignored.", ch, u); 501 } else { 502 *days = u; 503 } 504 } 505 506 #define todigit(x) ((x) - '0') 507 #define ATOI2(x) (todigit((x)[0]) * 10 + todigit((x)[1])) 508 #define ISDIG2(x) (isdigit((unsigned char)(x)[0]) && isdigit((unsigned char)(x)[1])) 509 510 static void 511 getmmdd(struct tm *tp, char *ds) 512 { 513 int ok = FALSE; 514 struct tm ttm; 515 516 ttm = *tp; 517 ttm.tm_isdst = -1; 518 519 if (ISDIG2(ds)) { 520 ttm.tm_mon = ATOI2(ds) - 1; 521 ds += 2; 522 } 523 524 if (ISDIG2(ds)) { 525 ttm.tm_mday = ATOI2(ds); 526 ds += 2; 527 528 ok = TRUE; 529 } 530 531 if (ok) { 532 if (ISDIG2(ds) && ISDIG2(ds + 2)) { 533 ttm.tm_year = ATOI2(ds) * 100 - TM_YEAR_BASE; 534 ds += 2; 535 ttm.tm_year += ATOI2(ds); 536 } else if (ISDIG2(ds)) { 537 ttm.tm_year = ATOI2(ds); 538 if (ttm.tm_year < 69) 539 ttm.tm_year += 2000 - TM_YEAR_BASE; 540 else 541 ttm.tm_year += 1900 - TM_YEAR_BASE; 542 } 543 } 544 545 if (ok && (mktime(&ttm) < 0)) { 546 ok = FALSE; 547 } 548 549 if (ok) { 550 *tp = ttm; 551 } else { 552 warnx("Can't convert `%s' to date, ignored.", ds); 553 usage(); 554 } 555 } 556 557 static void 558 usage(void) 559 { 560 (void)fprintf(stderr, "usage: %s [-ax] [-d MMDD[[YY]YY]" 561 " [-f fname] [-l days] [-w days]\n", getprogname()); 562 exit(1); 563 } 564
Indexes created Tue Oct 21 19:09:51 GMT 2025