1 /* 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 43 #endif 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 #include <sys/uio.h> 54 #include <sys/wait.h> 55 #include <ctype.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <langinfo.h> 59 #include <locale.h> 60 #include <pwd.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 #include "pathnames.h" 67 #include "calendar.h" 68 69 70 const char *calendarFile = "calendar"; /* default calendar file */ 71 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */ 72 const char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */ 73 74 struct fixs neaster, npaskha; 75 76 struct iovec header[] = { 77 {"From: ", 6}, 78 {NULL, 0}, 79 {" (Reminder Service)\nTo: ", 24}, 80 {NULL, 0}, 81 {"\nSubject: ", 10}, 82 {NULL, 0}, 83 {"'s Calendar\nPrecedence: bulk\n\n", 30}, 84 }; 85 86 87 void 88 cal(void) 89 { 90 int printing; 91 char *p; 92 FILE *fp; 93 int ch, l; 94 int month; 95 int day; 96 int var; 97 static int d_first = -1; 98 char buf[2048 + 1]; 99 struct event *events = NULL; 100 101 if ((fp = opencal()) == NULL) 102 return; 103 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 104 if ((p = strchr(buf, '\n')) != NULL) 105 *p = '\0'; 106 else 107 while ((ch = getchar()) != '\n' && ch != EOF); 108 for (l = strlen(buf); 109 l > 0 && isspace((unsigned char)buf[l - 1]); 110 l--) 111 ; 112 buf[l] = '\0'; 113 if (buf[0] == '\0') 114 continue; 115 if (strncmp(buf, "LANG=", 5) == 0) { 116 (void) setlocale(LC_ALL, buf + 5); 117 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 118 setnnames(); 119 continue; 120 } 121 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) { 122 if (neaster.name != NULL) 123 free(neaster.name); 124 if ((neaster.name = strdup(buf + 7)) == NULL) 125 errx(1, "cannot allocate memory"); 126 neaster.len = strlen(buf + 7); 127 continue; 128 } 129 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) { 130 if (npaskha.name != NULL) 131 free(npaskha.name); 132 if ((npaskha.name = strdup(buf + 7)) == NULL) 133 errx(1, "cannot allocate memory"); 134 npaskha.len = strlen(buf + 7); 135 continue; 136 } 137 if (buf[0] != '\t') { 138 printing = isnow(buf, &month, &day, &var) ? 1 : 0; 139 if ((p = strchr(buf, '\t')) == NULL) 140 continue; 141 if (p > buf && p[-1] == '*') 142 var = 1; 143 if (printing) { 144 struct tm tm; 145 char dbuf[80]; 146 147 if (d_first < 0) 148 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 149 tm.tm_sec = 0; /* unused */ 150 tm.tm_min = 0; /* unused */ 151 tm.tm_hour = 0; /* unused */ 152 tm.tm_wday = 0; /* unused */ 153 tm.tm_mon = month - 1; 154 tm.tm_mday = day; 155 tm.tm_year = tp->tm_year; /* unused */ 156 (void)strftime(dbuf, sizeof(dbuf), 157 d_first ? "%e %b" : "%b %e", 158 &tm); 159 events = event_add(events, month, day, dbuf, var, p); 160 } 161 } 162 else if (printing) 163 event_continue(events, buf); 164 } 165 166 event_print_all(fp, events); 167 closecal(fp); 168 } 169 170 /* 171 * Functions to handle buffered calendar events. 172 */ 173 struct event * 174 event_add(struct event *events, int month, int day, char *date, int var, char *txt) 175 { 176 struct event *e; 177 178 e = (struct event *)calloc(1, sizeof(struct event)); 179 if (e == NULL) 180 errx(1, "event_add: cannot allocate memory"); 181 e->month = month; 182 e->day = day; 183 e->var = var; 184 e->date = strdup(date); 185 if (e->date == NULL) 186 errx(1, "event_add: cannot allocate memory"); 187 e->text = strdup(txt); 188 if (e->text == NULL) 189 errx(1, "event_add: cannot allocate memory"); 190 e->next = events; 191 192 return e; 193 } 194 195 void 196 event_continue(struct event *e, char *txt) 197 { 198 char *text; 199 200 text = strdup(e->text); 201 if (text == NULL) 202 errx(1, "event_continue: cannot allocate memory"); 203 204 free(e->text); 205 e->text = (char *)malloc(strlen(text) + strlen(txt) + 3); 206 if (e->text == NULL) 207 errx(1, "event_continue: cannot allocate memory"); 208 strcpy(e->text, text); 209 strcat(e->text, "\n"); 210 strcat(e->text, txt); 211 free(text); 212 213 return; 214 } 215 216 void 217 event_print_all(FILE *fp, struct event *events) 218 { 219 struct event *e, *e_next; 220 int daycount = f_dayAfter + f_dayBefore; 221 int daycounter; 222 int day, month; 223 224 for (daycounter = 0; daycounter <= daycount; daycounter++) { 225 day = tp->tm_yday - f_dayBefore + daycounter; 226 if (day < 0) day += yrdays; 227 if (day >= yrdays) day -= yrdays; 228 229 month = 1; 230 while (month <= 12) { 231 if (day <= cumdays[month]) 232 break; 233 month++; 234 } 235 month--; 236 day -= cumdays[month]; 237 238 #ifdef DEBUG 239 fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day); 240 #endif 241 242 for (e = events; e != NULL; e = e_next ) { 243 e_next = e->next; 244 245 if (month != e->month || day != e->day) 246 continue; 247 248 (void)fprintf(fp, "%s%c%s\n", e->date, 249 e->var ? '*' : ' ', e->text); 250 } 251 } 252 } 253 254 int 255 getfield(char *p, char **endp, int *flags) 256 { 257 int val, var; 258 char *start, savech; 259 260 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) 261 && *p != '*'; ++p); 262 if (*p == '*') { /* `*' is current month */ 263 *flags |= F_ISMONTH; 264 *endp = p+1; 265 return (tp->tm_mon + 1); 266 } 267 if (isdigit((unsigned char)*p)) { 268 val = strtol(p, &p, 10); /* if 0, it's failure */ 269 for (; !isdigit((unsigned char)*p) 270 && !isalpha((unsigned char)*p) && *p != '*'; ++p); 271 *endp = p; 272 return (val); 273 } 274 for (start = p; isalpha((unsigned char)*++p);); 275 276 /* Sunday-1 */ 277 if (*p == '+' || *p == '-') 278 for(; isdigit((unsigned char)*++p);); 279 280 savech = *p; 281 *p = '\0'; 282 283 /* Month */ 284 if ((val = getmonth(start)) != 0) 285 *flags |= F_ISMONTH; 286 287 /* Day */ 288 else if ((val = getday(start)) != 0) { 289 *flags |= F_ISDAY; 290 291 /* variable weekday */ 292 if ((var = getdayvar(start)) != 0) { 293 if (var <=5 && var >= -4) 294 val += var * 10; 295 #ifdef DEBUG 296 printf("var: %d\n", var); 297 #endif 298 } 299 } 300 301 /* Easter */ 302 else if ((val = geteaster(start, tp->tm_year + 1900)) != 0) 303 *flags |= F_EASTER; 304 305 /* Paskha */ 306 else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0) 307 *flags |= F_EASTER; 308 309 /* undefined rest */ 310 else { 311 *p = savech; 312 return (0); 313 } 314 for (*p = savech; !isdigit((unsigned char)*p) 315 && !isalpha((unsigned char)*p) && *p != '*'; ++p); 316 *endp = p; 317 return (val); 318 } 319 320 char path[MAXPATHLEN]; 321 322 FILE * 323 opencal(void) 324 { 325 uid_t uid; 326 size_t i; 327 int fd, found, pdes[2]; 328 struct stat sbuf; 329 330 /* open up calendar file as stdin */ 331 if (!freopen(calendarFile, "r", stdin)) { 332 if (doall) { 333 if (chdir(calendarHomes[0]) != 0) 334 return (NULL); 335 if (stat(calendarNoMail, &sbuf) == 0) 336 return (NULL); 337 if (!freopen(calendarFile, "r", stdin)) 338 return (NULL); 339 } else { 340 char *home = getenv("HOME"); 341 if (home == NULL || *home == '\0') 342 errx(1, "cannot get home directory"); 343 chdir(home); 344 for (found = i = 0; i < sizeof(calendarHomes) / 345 sizeof(calendarHomes[0]); i++) 346 if (chdir(calendarHomes[i]) == 0 && 347 freopen(calendarFile, "r", stdin)) { 348 found = 1; 349 break; 350 } 351 if (!found) 352 errx(1, "can't open calendar file \"%s\": %s (%d)", 353 calendarFile, strerror(errno), errno); 354 } 355 } 356 if (pipe(pdes) < 0) 357 return (NULL); 358 switch (fork()) { 359 case -1: /* error */ 360 (void)close(pdes[0]); 361 (void)close(pdes[1]); 362 return (NULL); 363 case 0: 364 /* child -- stdin already setup, set stdout to pipe input */ 365 if (pdes[1] != STDOUT_FILENO) { 366 (void)dup2(pdes[1], STDOUT_FILENO); 367 (void)close(pdes[1]); 368 } 369 (void)close(pdes[0]); 370 uid = geteuid(); 371 if (setuid(getuid()) < 0) { 372 warnx("first setuid failed"); 373 _exit(1); 374 }; 375 if (setgid(getegid()) < 0) { 376 warnx("setgid failed"); 377 _exit(1); 378 } 379 if (setuid(uid) < 0) { 380 warnx("setuid failed"); 381 _exit(1); 382 } 383 execl(_PATH_CPP, "cpp", "-P", 384 "-traditional", "-nostdinc", /* GCC specific opts */ 385 "-I.", "-I", _PATH_INCLUDE, (char *)NULL); 386 warn(_PATH_CPP); 387 _exit(1); 388 } 389 /* parent -- set stdin to pipe output */ 390 (void)dup2(pdes[0], STDIN_FILENO); 391 (void)close(pdes[0]); 392 (void)close(pdes[1]); 393 394 /* not reading all calendar files, just set output to stdout */ 395 if (!doall) 396 return (stdout); 397 398 /* set output to a temporary file, so if no output don't send mail */ 399 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 400 if ((fd = mkstemp(path)) < 0) 401 return (NULL); 402 return (fdopen(fd, "w+")); 403 } 404 405 void 406 closecal(FILE *fp) 407 { 408 uid_t uid; 409 struct stat sbuf; 410 int nread, pdes[2], status; 411 char buf[1024]; 412 413 if (!doall) 414 return; 415 416 (void)rewind(fp); 417 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 418 goto done; 419 if (pipe(pdes) < 0) 420 goto done; 421 switch (fork()) { 422 case -1: /* error */ 423 (void)close(pdes[0]); 424 (void)close(pdes[1]); 425 goto done; 426 case 0: 427 /* child -- set stdin to pipe output */ 428 if (pdes[0] != STDIN_FILENO) { 429 (void)dup2(pdes[0], STDIN_FILENO); 430 (void)close(pdes[0]); 431 } 432 (void)close(pdes[1]); 433 uid = geteuid(); 434 if (setuid(getuid()) < 0) { 435 warnx("setuid failed"); 436 _exit(1); 437 }; 438 if (setgid(getegid()) < 0) { 439 warnx("setgid failed"); 440 _exit(1); 441 } 442 if (setuid(uid) < 0) { 443 warnx("setuid failed"); 444 _exit(1); 445 } 446 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 447 "\"Reminder Service\"", (char *)NULL); 448 warn(_PATH_SENDMAIL); 449 _exit(1); 450 } 451 /* parent -- write to pipe input */ 452 (void)close(pdes[0]); 453 454 header[1].iov_base = header[3].iov_base = pw->pw_name; 455 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 456 writev(pdes[1], header, 7); 457 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 458 (void)write(pdes[1], buf, nread); 459 (void)close(pdes[1]); 460 done: (void)fclose(fp); 461 (void)unlink(path); 462 while (wait(&status) >= 0); 463 } 464