1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1989, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 41 #endif 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/param.h> 48 #include <sys/stat.h> 49 #include <sys/wait.h> 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <langinfo.h> 54 #include <locale.h> 55 #include <pwd.h> 56 #include <stdbool.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <stringlist.h> 61 #include <time.h> 62 #include <unistd.h> 63 64 #include "pathnames.h" 65 #include "calendar.h" 66 67 enum { 68 T_OK = 0, 69 T_ERR, 70 T_PROCESS, 71 }; 72 73 const char *calendarFile = "calendar"; /* default calendar file */ 74 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */ 75 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */ 76 77 static char path[MAXPATHLEN]; 78 79 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon; 80 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice; 81 82 static int cal_parse(FILE *in, FILE *out); 83 84 static StringList *definitions = NULL; 85 static struct event *events[MAXCOUNT]; 86 static char *extradata[MAXCOUNT]; 87 88 static void 89 trimlr(char **buf) 90 { 91 char *walk = *buf; 92 char *last; 93 94 while (isspace(*walk)) 95 walk++; 96 if (*walk != '\0') { 97 last = walk + strlen(walk) - 1; 98 while (last > walk && isspace(*last)) 99 last--; 100 *(last+1) = 0; 101 } 102 103 *buf = walk; 104 } 105 106 static FILE * 107 cal_fopen(const char *file) 108 { 109 FILE *fp; 110 char *home = getenv("HOME"); 111 unsigned int i; 112 113 if (home == NULL || *home == '\0') { 114 warnx("Cannot get home directory"); 115 return (NULL); 116 } 117 118 if (chdir(home) != 0) { 119 warnx("Cannot enter home directory"); 120 return (NULL); 121 } 122 123 for (i = 0; i < nitems(calendarHomes); i++) { 124 if (chdir(calendarHomes[i]) != 0) 125 continue; 126 127 if ((fp = fopen(file, "r")) != NULL) 128 return (fp); 129 } 130 131 warnx("can't open calendar file \"%s\"", file); 132 133 return (NULL); 134 } 135 136 static int 137 token(char *line, FILE *out, bool *skip) 138 { 139 char *walk, c, a; 140 141 if (strncmp(line, "endif", 5) == 0) { 142 *skip = false; 143 return (T_OK); 144 } 145 146 if (*skip) 147 return (T_OK); 148 149 if (strncmp(line, "include", 7) == 0) { 150 walk = line + 7; 151 152 trimlr(&walk); 153 154 if (*walk == '\0') { 155 warnx("Expecting arguments after #include"); 156 return (T_ERR); 157 } 158 159 if (*walk != '<' && *walk != '\"') { 160 warnx("Excecting '<' or '\"' after #include"); 161 return (T_ERR); 162 } 163 164 a = *walk; 165 walk++; 166 c = walk[strlen(walk) - 1]; 167 168 switch(c) { 169 case '>': 170 if (a != '<') { 171 warnx("Unterminated include expecting '\"'"); 172 return (T_ERR); 173 } 174 break; 175 case '\"': 176 if (a != '\"') { 177 warnx("Unterminated include expecting '>'"); 178 return (T_ERR); 179 } 180 break; 181 default: 182 warnx("Unterminated include expecting '%c'", 183 a == '<' ? '>' : '\"' ); 184 return (T_ERR); 185 } 186 walk[strlen(walk) - 1] = '\0'; 187 188 if (cal_parse(cal_fopen(walk), out)) 189 return (T_ERR); 190 191 return (T_OK); 192 } 193 194 if (strncmp(line, "define", 6) == 0) { 195 if (definitions == NULL) 196 definitions = sl_init(); 197 walk = line + 6; 198 trimlr(&walk); 199 200 if (*walk == '\0') { 201 warnx("Expecting arguments after #define"); 202 return (T_ERR); 203 } 204 205 sl_add(definitions, strdup(walk)); 206 return (T_OK); 207 } 208 209 if (strncmp(line, "ifndef", 6) == 0) { 210 walk = line + 6; 211 trimlr(&walk); 212 213 if (*walk == '\0') { 214 warnx("Expecting arguments after #ifndef"); 215 return (T_ERR); 216 } 217 218 if (definitions != NULL && sl_find(definitions, walk) != NULL) 219 *skip = true; 220 221 return (T_OK); 222 } 223 224 return (T_PROCESS); 225 226 } 227 228 #define REPLACE(string, slen, struct_) \ 229 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \ 230 if (struct_.name != NULL) \ 231 free(struct_.name); \ 232 if ((struct_.name = strdup(buf + (slen))) == NULL) \ 233 errx(1, "cannot allocate memory"); \ 234 struct_.len = strlen(buf + (slen)); \ 235 continue; \ 236 } 237 static int 238 cal_parse(FILE *in, FILE *out) 239 { 240 char *line = NULL; 241 char *buf; 242 size_t linecap = 0; 243 ssize_t linelen; 244 ssize_t l; 245 static int d_first = -1; 246 static int count = 0; 247 int i; 248 int month[MAXCOUNT]; 249 int day[MAXCOUNT]; 250 int year[MAXCOUNT]; 251 bool skip = false; 252 char dbuf[80]; 253 char *pp, p; 254 struct tm tm; 255 int flags; 256 257 /* Unused */ 258 tm.tm_sec = 0; 259 tm.tm_min = 0; 260 tm.tm_hour = 0; 261 tm.tm_wday = 0; 262 263 if (in == NULL) 264 return (1); 265 266 while ((linelen = getline(&line, &linecap, in)) > 0) { 267 if (*line == '#') { 268 switch (token(line+1, out, &skip)) { 269 case T_ERR: 270 free(line); 271 return (1); 272 case T_OK: 273 continue; 274 case T_PROCESS: 275 break; 276 default: 277 break; 278 } 279 } 280 281 if (skip) 282 continue; 283 284 buf = line; 285 for (l = linelen; 286 l > 0 && isspace((unsigned char)buf[l - 1]); 287 l--) 288 ; 289 buf[l] = '\0'; 290 if (buf[0] == '\0') 291 continue; 292 293 /* Parse special definitions: LANG, Easter, Paskha etc */ 294 if (strncmp(buf, "LANG=", 5) == 0) { 295 (void)setlocale(LC_ALL, buf + 5); 296 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 297 setnnames(); 298 continue; 299 } 300 REPLACE("Easter=", 7, neaster); 301 REPLACE("Paskha=", 7, npaskha); 302 REPLACE("ChineseNewYear=", 15, ncny); 303 REPLACE("NewMoon=", 8, nnewmoon); 304 REPLACE("FullMoon=", 9, nfullmoon); 305 REPLACE("MarEquinox=", 11, nmarequinox); 306 REPLACE("SepEquinox=", 11, nsepequinox); 307 REPLACE("JunSolstice=", 12, njunsolstice); 308 REPLACE("DecSolstice=", 12, ndecsolstice); 309 if (strncmp(buf, "SEQUENCE=", 9) == 0) { 310 setnsequences(buf + 9); 311 continue; 312 } 313 314 /* 315 * If the line starts with a tab, the data has to be 316 * added to the previous line 317 */ 318 if (buf[0] == '\t') { 319 for (i = 0; i < count; i++) 320 event_continue(events[i], buf); 321 continue; 322 } 323 324 /* Get rid of leading spaces (non-standard) */ 325 while (isspace((unsigned char)buf[0])) 326 memcpy(buf, buf + 1, strlen(buf)); 327 328 /* No tab in the line, then not a valid line */ 329 if ((pp = strchr(buf, '\t')) == NULL) 330 continue; 331 332 /* Trim spaces in front of the tab */ 333 while (isspace((unsigned char)pp[-1])) 334 pp--; 335 336 p = *pp; 337 *pp = '\0'; 338 if ((count = parsedaymonth(buf, year, month, day, &flags, 339 extradata)) == 0) 340 continue; 341 *pp = p; 342 if (count < 0) { 343 /* Show error status based on return value */ 344 if (debug) 345 fprintf(stderr, "Ignored: %s\n", buf); 346 if (count == -1) 347 continue; 348 count = -count + 1; 349 } 350 351 /* Find the last tab */ 352 while (pp[1] == '\t') 353 pp++; 354 355 if (d_first < 0) 356 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 357 358 for (i = 0; i < count; i++) { 359 tm.tm_mon = month[i] - 1; 360 tm.tm_mday = day[i]; 361 tm.tm_year = year[i] - 1900; 362 (void)strftime(dbuf, sizeof(dbuf), 363 d_first ? "%e %b" : "%b %e", &tm); 364 if (debug) 365 fprintf(stderr, "got %s\n", pp); 366 events[i] = event_add(year[i], month[i], day[i], dbuf, 367 ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp, 368 extradata[i]); 369 } 370 } 371 372 free(line); 373 fclose(in); 374 375 return (0); 376 } 377 378 void 379 cal(void) 380 { 381 FILE *fpin; 382 FILE *fpout; 383 int i; 384 385 for (i = 0; i < MAXCOUNT; i++) 386 extradata[i] = (char *)calloc(1, 20); 387 388 389 if ((fpin = opencalin()) == NULL) 390 return; 391 392 if ((fpout = opencalout()) == NULL) { 393 fclose(fpin); 394 return; 395 } 396 397 if (cal_parse(fpin, fpout)) 398 return; 399 400 event_print_all(fpout); 401 closecal(fpout); 402 } 403 404 FILE * 405 opencalin(void) 406 { 407 struct stat sbuf; 408 FILE *fpin; 409 410 /* open up calendar file */ 411 if ((fpin = fopen(calendarFile, "r")) == NULL) { 412 if (doall) { 413 if (chdir(calendarHomes[0]) != 0) 414 return (NULL); 415 if (stat(calendarNoMail, &sbuf) == 0) 416 return (NULL); 417 if ((fpin = fopen(calendarFile, "r")) == NULL) 418 return (NULL); 419 } else { 420 fpin = cal_fopen(calendarFile); 421 } 422 } 423 return (fpin); 424 } 425 426 FILE * 427 opencalout(void) 428 { 429 int fd; 430 431 /* not reading all calendar files, just set output to stdout */ 432 if (!doall) 433 return (stdout); 434 435 /* set output to a temporary file, so if no output don't send mail */ 436 snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 437 if ((fd = mkstemp(path)) < 0) 438 return (NULL); 439 return (fdopen(fd, "w+")); 440 } 441 442 void 443 closecal(FILE *fp) 444 { 445 uid_t uid; 446 struct stat sbuf; 447 int nread, pdes[2], status; 448 char buf[1024]; 449 450 if (!doall) 451 return; 452 453 rewind(fp); 454 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 455 goto done; 456 if (pipe(pdes) < 0) 457 goto done; 458 switch (fork()) { 459 case -1: /* error */ 460 (void)close(pdes[0]); 461 (void)close(pdes[1]); 462 goto done; 463 case 0: 464 /* child -- set stdin to pipe output */ 465 if (pdes[0] != STDIN_FILENO) { 466 (void)dup2(pdes[0], STDIN_FILENO); 467 (void)close(pdes[0]); 468 } 469 (void)close(pdes[1]); 470 uid = geteuid(); 471 if (setuid(getuid()) < 0) { 472 warnx("setuid failed"); 473 _exit(1); 474 } 475 if (setgid(getegid()) < 0) { 476 warnx("setgid failed"); 477 _exit(1); 478 } 479 if (setuid(uid) < 0) { 480 warnx("setuid failed"); 481 _exit(1); 482 } 483 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 484 "\"Reminder Service\"", (char *)NULL); 485 warn(_PATH_SENDMAIL); 486 _exit(1); 487 } 488 /* parent -- write to pipe input */ 489 (void)close(pdes[0]); 490 491 write(pdes[1], "From: \"Reminder Service\" <", 26); 492 write(pdes[1], pw->pw_name, strlen(pw->pw_name)); 493 write(pdes[1], ">\nTo: <", 7); 494 write(pdes[1], pw->pw_name, strlen(pw->pw_name)); 495 write(pdes[1], ">\nSubject: ", 11); 496 write(pdes[1], dayname, strlen(dayname)); 497 write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30); 498 499 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 500 (void)write(pdes[1], buf, nread); 501 (void)close(pdes[1]); 502 done: (void)fclose(fp); 503 (void)unlink(path); 504 while (wait(&status) >= 0); 505 } 506