calendar.c revision 1.33
1 /* $NetBSD: calendar.c,v 1.33 2004/11/30 01:54:17 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 1.33 2004/11/30 01:54:17 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:")) != -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 flags = 0; 249 /* didn't recognize anything, skip it */ 250 if (!(v1 = getfield(endp, &endp, &flags))) 251 return (0); 252 if (flags & F_ISDAY || v1 > 12) { 253 /* found a day */ 254 day = v1; 255 month = tp->tm_mon + 1; 256 } else if (flags & F_ISMONTH) { 257 month = v1; 258 /* if no recognizable day, assume the first */ 259 if (!(day = getfield(endp, &endp, &flags))) 260 day = 1; 261 } else { 262 v2 = getfield(endp, &endp, &flags); 263 if (flags & F_ISMONTH) { 264 day = v1; 265 month = v2; 266 } else { 267 /* F_ISDAY set, v2 > 12, or no way to tell */ 268 month = v1; 269 /* if no recognizable day, assume the first */ 270 day = v2 ? v2 : 1; 271 } 272 } 273 if (flags & F_ISDAY) 274 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 275 day = cumdays[month] + day; 276 277 /* if today or today + offset days */ 278 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 279 return (1); 280 /* if number of days left in this year + days to event in next year */ 281 if (yrdays - tp->tm_yday + day <= offset) 282 return (1); 283 return (0); 284 } 285 286 static int 287 getfield(p, endp, flags) 288 char *p, **endp; 289 int *flags; 290 { 291 int val; 292 char *start, savech; 293 294 #define FLDCHAR(a) (*p != '\0' && !isdigit((unsigned char)*p) && \ 295 !isalpha((unsigned char)*p) && *p != '*') 296 297 for (; FLDCHAR(*p); ++p) 298 continue; 299 if (*p == '*') { /* `*' is current month */ 300 *flags |= F_ISMONTH; 301 *endp = p+1; 302 return (tp->tm_mon + 1); 303 } 304 if (isdigit((unsigned char)*p)) { 305 val = strtol(p, &p, 10); /* if 0, it's failure */ 306 for (; FLDCHAR(*p); ++p) 307 continue; 308 *endp = p; 309 return (val); 310 } 311 for (start = p; *p != '\0' && isalpha((unsigned char)*++p);) 312 continue; 313 savech = *p; 314 *p = '\0'; 315 if ((val = getmonth(start)) != 0) { 316 *flags |= F_ISMONTH; 317 } else if ((val = getday(start)) != 0) { 318 *flags |= F_ISDAY; 319 } else { 320 *p = savech; 321 return (0); 322 } 323 for (*p = savech; FLDCHAR(*p); ++p) 324 continue; 325 *endp = p; 326 return (val); 327 } 328 329 static FILE * 330 opencal(void) 331 { 332 int fd, pdes[2]; 333 char **name; 334 335 /* open up calendar file as stdin */ 336 if (fname == NULL) { 337 for (name = defaultnames; *name != NULL; name++) { 338 if (!freopen(*name, "rf", stdin)) 339 continue; 340 else 341 break; 342 } 343 if (*name == NULL) { 344 if (doall) 345 return (NULL); 346 err(1, "Cannot open calendar file"); 347 } 348 } else if (!freopen(fname, "rf", stdin)) { 349 if (doall) 350 return (NULL); 351 err(1, "Cannot open `%s'", fname); 352 } 353 354 if (pipe(pdes) < 0) { 355 warn("Cannot open pipe"); 356 return (NULL); 357 } 358 359 switch (fork()) { 360 case -1: /* error */ 361 (void)close(pdes[0]); 362 (void)close(pdes[1]); 363 return (NULL); 364 case 0: 365 /* child -- stdin already setup, set stdout to pipe input */ 366 if (pdes[1] != STDOUT_FILENO) { 367 (void)dup2(pdes[1], STDOUT_FILENO); 368 (void)close(pdes[1]); 369 } 370 (void)close(pdes[0]); 371 /* tell CPP to only open regular files */ 372 if(!cpp_restricted && setenv("CPP_RESTRICTED", "", 1)) 373 err(1, "Cannot restrict cpp"); 374 cpp_restricted = 1; 375 376 (void)execl(_PATH_CPP, "cpp", "-traditional", "-P", "-I.", 377 "-I" _PATH_CALENDARS, NULL); 378 err(1, "Cannot exec `%s'", _PATH_CPP); 379 /*NOTREACHED*/ 380 } 381 382 /* parent -- set stdin to pipe output */ 383 (void)dup2(pdes[0], STDIN_FILENO); 384 (void)close(pdes[0]); 385 (void)close(pdes[1]); 386 387 /* not reading all calendar files, just set output to stdout */ 388 if (!doall) 389 return (stdout); 390 391 /* set output to a temporary file, so if no output don't send mail */ 392 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 393 if ((fd = mkstemp(path)) < 0) { 394 warn("Cannot create temporary file"); 395 return (NULL); 396 } 397 return (fdopen(fd, "w+")); 398 } 399 400 static void 401 closecal(fp) 402 FILE *fp; 403 { 404 struct stat sbuf; 405 int nread, pdes[2], status; 406 char buf[1024]; 407 408 if (!doall) 409 return; 410 411 (void)rewind(fp); 412 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 413 goto done; 414 if (pipe(pdes) < 0) 415 goto done; 416 switch (fork()) { 417 case -1: /* error */ 418 (void)close(pdes[0]); 419 (void)close(pdes[1]); 420 goto done; 421 case 0: 422 /* child -- set stdin to pipe output */ 423 if (pdes[0] != STDIN_FILENO) { 424 (void)dup2(pdes[0], STDIN_FILENO); 425 (void)close(pdes[0]); 426 } 427 (void)close(pdes[1]); 428 (void)execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 429 "\"Reminder Service\"", "-f", "root", NULL); 430 err(1, "Cannot exec `%s'", _PATH_SENDMAIL); 431 /*NOTREACHED*/ 432 } 433 /* parent -- write to pipe input */ 434 (void)close(pdes[0]); 435 436 header[1].iov_base = header[3].iov_base = (void *)pw->pw_name; 437 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 438 writev(pdes[1], header, 7); 439 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 440 (void)write(pdes[1], buf, nread); 441 (void)close(pdes[1]); 442 443 done: (void)fclose(fp); 444 (void)unlink(path); 445 while (wait(&status) >= 0) 446 continue; 447 } 448 449 static int 450 getmonth(s) 451 char *s; 452 { 453 char **p; 454 455 for (p = months; *p; ++p) 456 if (!strncasecmp(s, *p, 3)) 457 return ((p - months) + 1); 458 return (0); 459 } 460 461 static int 462 getday(s) 463 char *s; 464 { 465 char **p; 466 467 for (p = days; *p; ++p) 468 if (!strncasecmp(s, *p, 3)) 469 return ((p - days) + 1); 470 return (0); 471 } 472 473 static void 474 atodays(int ch, char *optarg, unsigned short *days) 475 { 476 int u; 477 478 u = atoi(optarg); 479 if ((u < 0) || (u > 366)) { 480 warnx("-%c %d out of range 0-366, ignored.", ch, u); 481 } else { 482 *days = u; 483 } 484 } 485 486 #define todigit(x) ((x) - '0') 487 #define ATOI2(x) (todigit((x)[0]) * 10 + todigit((x)[1])) 488 #define ISDIG2(x) (isdigit((unsigned char)(x)[0]) && isdigit((unsigned char)(x)[1])) 489 490 static void 491 getmmdd(struct tm *tp, char *ds) 492 { 493 int ok = FALSE; 494 struct tm ttm; 495 496 ttm = *tp; 497 ttm.tm_isdst = -1; 498 499 if (ISDIG2(ds)) { 500 ttm.tm_mon = ATOI2(ds) - 1; 501 ds += 2; 502 } 503 504 if (ISDIG2(ds)) { 505 ttm.tm_mday = ATOI2(ds); 506 ds += 2; 507 508 ok = TRUE; 509 } 510 511 if (ok) { 512 if (ISDIG2(ds) && ISDIG2(ds + 2)) { 513 ttm.tm_year = ATOI2(ds) * 100 - TM_YEAR_BASE; 514 ds += 2; 515 ttm.tm_year += ATOI2(ds); 516 } else if (ISDIG2(ds)) { 517 ttm.tm_year = ATOI2(ds); 518 if (ttm.tm_year < 69) 519 ttm.tm_year += 2000 - TM_YEAR_BASE; 520 else 521 ttm.tm_year += 1900 - TM_YEAR_BASE; 522 } 523 } 524 525 if (ok && (mktime(&ttm) < 0)) { 526 ok = FALSE; 527 } 528 529 if (ok) { 530 *tp = ttm; 531 } else { 532 warnx("Can't convert `%s' to date, ignored.", ds); 533 usage(); 534 } 535 } 536 537 static void 538 usage(void) 539 { 540 (void)fprintf(stderr, "usage: %s [-a] [-d MMDD[[YY]YY]" 541 " [-f fname] [-l days] [-w days]\n", getprogname()); 542 exit(1); 543 } 544
Indexes created Thu Oct 23 22:10:10 GMT 2025