io.c revision 200628
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 35static 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 42static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 43#endif 44#endif 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.bin/calendar/io.c 200628 2009-12-17 08:42:44Z rse $"); 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 * Event sorting related functions: 71 * - Use event_add() to create a new event 72 * - Use event_continue() to add more text to the last added event 73 * - Use event_print_all() to display them in time chronological order 74 */ 75static struct event *event_add(struct event *, int, int, char *, int, char *); 76static void event_continue(struct event *events, char *txt); 77static void event_print_all(FILE *fp, struct event *events); 78struct event { 79 int month; 80 int day; 81 int var; 82 char *date; 83 char *text; 84 struct event *next; 85}; 86 87const char *calendarFile = "calendar"; /* default calendar file */ 88const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */ 89const char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */ 90 91char path[MAXPATHLEN]; 92 93struct fixs neaster, npaskha; 94 95struct iovec header[] = { 96 {"From: ", 6}, 97 {NULL, 0}, 98 {" (Reminder Service)\nTo: ", 24}, 99 {NULL, 0}, 100 {"\nSubject: ", 10}, 101 {NULL, 0}, 102 {"'s Calendar\nPrecedence: bulk\n\n", 30}, 103}; 104 105void 106cal(void) 107{ 108 int printing; 109 char *p; 110 FILE *fp; 111 int ch, l; 112 int month; 113 int day; 114 int var; 115 static int d_first = -1; 116 char buf[2048 + 1]; 117 struct event *events = NULL; 118 119 if ((fp = opencal()) == NULL) 120 return; 121 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 122 if ((p = strchr(buf, '\n')) != NULL) 123 *p = '\0'; 124 else 125 while ((ch = getchar()) != '\n' && ch != EOF); 126 for (l = strlen(buf); 127 l > 0 && isspace((unsigned char)buf[l - 1]); 128 l--) 129 ; 130 buf[l] = '\0'; 131 if (buf[0] == '\0') 132 continue; 133 if (strncmp(buf, "LANG=", 5) == 0) { 134 (void)setlocale(LC_ALL, buf + 5); 135 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 136 setnnames(); 137 continue; 138 } 139 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) { 140 if (neaster.name != NULL) 141 free(neaster.name); 142 if ((neaster.name = strdup(buf + 7)) == NULL) 143 errx(1, "cannot allocate memory"); 144 neaster.len = strlen(buf + 7); 145 continue; 146 } 147 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) { 148 if (npaskha.name != NULL) 149 free(npaskha.name); 150 if ((npaskha.name = strdup(buf + 7)) == NULL) 151 errx(1, "cannot allocate memory"); 152 npaskha.len = strlen(buf + 7); 153 continue; 154 } 155 if (buf[0] != '\t') { 156 printing = isnow(buf, &month, &day, &var) ? 1 : 0; 157 if ((p = strchr(buf, '\t')) == NULL) 158 continue; 159 if (p > buf && p[-1] == '*') 160 var = 1; 161 if (printing) { 162 struct tm tm; 163 char dbuf[80]; 164 165 if (d_first < 0) 166 d_first = 167 (*nl_langinfo(D_MD_ORDER) == 'd'); 168 tm.tm_sec = 0; /* unused */ 169 tm.tm_min = 0; /* unused */ 170 tm.tm_hour = 0; /* unused */ 171 tm.tm_wday = 0; /* unused */ 172 tm.tm_mon = month - 1; 173 tm.tm_mday = day; 174 tm.tm_year = tp->tm_year; /* unused */ 175 (void)strftime(dbuf, sizeof(dbuf), 176 d_first ? "%e %b" : "%b %e", &tm); 177 events = event_add(events, month, day, dbuf, 178 var, p); 179 } 180 } else { 181 if (printing) 182 event_continue(events, buf); 183 } 184 } 185 186 event_print_all(fp, events); 187 closecal(fp); 188} 189 190static struct event * 191event_add(struct event *events, int month, int day, 192 char *date, int var, char *txt) 193{ 194 struct event *e; 195 196 /* 197 * Creating a new event: 198 * - Create a new event 199 * - Copy the machine readable day and month 200 * - Copy the human readable and language specific date 201 * - Copy the text of the event 202 */ 203 e = (struct event *)calloc(1, sizeof(struct event)); 204 if (e == NULL) 205 errx(1, "event_add: cannot allocate memory"); 206 e->month = month; 207 e->day = day; 208 e->var = var; 209 e->date = strdup(date); 210 if (e->date == NULL) 211 errx(1, "event_add: cannot allocate memory"); 212 e->text = strdup(txt); 213 if (e->text == NULL) 214 errx(1, "event_add: cannot allocate memory"); 215 e->next = events; 216 217 return e; 218} 219 220static void 221event_continue(struct event *e, char *txt) 222{ 223 char *text; 224 225 /* 226 * Adding text to the event: 227 * - Save a copy of the old text (unknown length, so strdup()) 228 * - Allocate enough space for old text + \n + new text + 0 229 * - Store the old text + \n + new text 230 * - Destroy the saved copy. 231 */ 232 text = strdup(e->text); 233 if (text == NULL) 234 errx(1, "event_continue: cannot allocate memory"); 235 236 free(e->text); 237 e->text = (char *)malloc(strlen(text) + strlen(txt) + 3); 238 if (e->text == NULL) 239 errx(1, "event_continue: cannot allocate memory"); 240 strcpy(e->text, text); 241 strcat(e->text, "\n"); 242 strcat(e->text, txt); 243 free(text); 244 245 return; 246} 247 248static void 249event_print_all(FILE *fp, struct event *events) 250{ 251 struct event *e, *e_next; 252 int daycounter; 253 int day, month; 254 255 /* 256 * Print all events: 257 * - We know the number of days to be counted (f_dayAfter + f_dayBefore) 258 * - We know the current day of the year ("now" - f_dayBefore + counter) 259 * - We know the number of days in the year (yrdays, set in settime()) 260 * - So we know the date on which the current daycounter is on the 261 * calendar in days and months. 262 * - Go through the list of events, and print all matching dates 263 */ 264 for (daycounter = 0; daycounter <= f_dayAfter + f_dayBefore; 265 daycounter++) { 266 day = tp->tm_yday - f_dayBefore + daycounter; 267 if (day < 0) 268 day += yrdays; 269 if (day >= yrdays) 270 day -= yrdays; 271 272 /* 273 * When we know the day of the year, we can determine the day 274 * of the month and the month. 275 */ 276 month = 1; 277 while (month <= 12) { 278 if (day <= cumdays[month]) 279 break; 280 month++; 281 } 282 month--; 283 day -= cumdays[month]; 284 285#ifdef DEBUG 286 fprintf(stderr, "event_print_allmonth: %d, day: %d\n", 287 month, day); 288#endif 289 290 /* 291 * Go through all events and print the text of the matching 292 * dates 293 */ 294 for (e = events; e != NULL; e = e_next) { 295 e_next = e->next; 296 297 if (month != e->month || day != e->day) 298 continue; 299 300 (void)fprintf(fp, "%s%c%s\n", e->date, 301 e->var ? '*' : ' ', e->text); 302 } 303 } 304} 305 306int 307getfield(char *p, char **endp, int *flags) 308{ 309 int val, var; 310 char *start, savech; 311 312 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) 313 && *p != '*'; ++p) 314 ; 315 if (*p == '*') { /* `*' is current month */ 316 *flags |= F_ISMONTH; 317 *endp = p + 1; 318 return (tp->tm_mon + 1); 319 } 320 if (isdigit((unsigned char)*p)) { 321 val = strtol(p, &p, 10); /* if 0, it's failure */ 322 for (; !isdigit((unsigned char)*p) 323 && !isalpha((unsigned char)*p) && *p != '*'; ++p); 324 *endp = p; 325 return (val); 326 } 327 for (start = p; isalpha((unsigned char)*++p);); 328 329 /* Sunday-1 */ 330 if (*p == '+' || *p == '-') 331 for(; isdigit((unsigned char)*++p);) 332 ; 333 334 savech = *p; 335 *p = '\0'; 336 337 /* Month */ 338 if ((val = getmonth(start)) != 0) 339 *flags |= F_ISMONTH; 340 341 /* Day */ 342 else if ((val = getday(start)) != 0) { 343 *flags |= F_ISDAY; 344 345 /* variable weekday */ 346 if ((var = getdayvar(start)) != 0) { 347 if (var <= 5 && var >= -4) 348 val += var * 10; 349#ifdef DEBUG 350 printf("var: %d\n", var); 351#endif 352 } 353 } 354 355 /* Easter */ 356 else if ((val = geteaster(start, tp->tm_year + 1900)) != 0) 357 *flags |= F_EASTER; 358 359 /* Paskha */ 360 else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0) 361 *flags |= F_EASTER; 362 363 /* undefined rest */ 364 else { 365 *p = savech; 366 return (0); 367 } 368 for (*p = savech; !isdigit((unsigned char)*p) 369 && !isalpha((unsigned char)*p) && *p != '*'; ++p) 370 ; 371 *endp = p; 372 return (val); 373} 374 375FILE * 376opencal(void) 377{ 378 uid_t uid; 379 size_t i; 380 int fd, found, pdes[2]; 381 struct stat sbuf; 382 383 /* open up calendar file as stdin */ 384 if (!freopen(calendarFile, "r", stdin)) { 385 if (doall) { 386 if (chdir(calendarHomes[0]) != 0) 387 return (NULL); 388 if (stat(calendarNoMail, &sbuf) == 0) 389 return (NULL); 390 if (!freopen(calendarFile, "r", stdin)) 391 return (NULL); 392 } else { 393 char *home = getenv("HOME"); 394 if (home == NULL || *home == '\0') 395 errx(1, "cannot get home directory"); 396 chdir(home); 397 for (found = i = 0; i < sizeof(calendarHomes) / 398 sizeof(calendarHomes[0]); i++) 399 if (chdir(calendarHomes[i]) == 0 && 400 freopen(calendarFile, "r", stdin)) { 401 found = 1; 402 break; 403 } 404 if (!found) 405 errx(1, 406 "can't open calendar file \"%s\": %s (%d)", 407 calendarFile, strerror(errno), errno); 408 } 409 } 410 if (pipe(pdes) < 0) 411 return (NULL); 412 switch (fork()) { 413 case -1: /* error */ 414 (void)close(pdes[0]); 415 (void)close(pdes[1]); 416 return (NULL); 417 case 0: 418 /* child -- stdin already setup, set stdout to pipe input */ 419 if (pdes[1] != STDOUT_FILENO) { 420 (void)dup2(pdes[1], STDOUT_FILENO); 421 (void)close(pdes[1]); 422 } 423 (void)close(pdes[0]); 424 uid = geteuid(); 425 if (setuid(getuid()) < 0) { 426 warnx("first setuid failed"); 427 _exit(1); 428 }; 429 if (setgid(getegid()) < 0) { 430 warnx("setgid failed"); 431 _exit(1); 432 } 433 if (setuid(uid) < 0) { 434 warnx("setuid failed"); 435 _exit(1); 436 } 437 execl(_PATH_CPP, "cpp", "-P", 438 "-traditional", "-nostdinc", /* GCC specific opts */ 439 "-I.", "-I", _PATH_INCLUDE, (char *)NULL); 440 warn(_PATH_CPP); 441 _exit(1); 442 } 443 /* parent -- set stdin to pipe output */ 444 (void)dup2(pdes[0], STDIN_FILENO); 445 (void)close(pdes[0]); 446 (void)close(pdes[1]); 447 448 /* not reading all calendar files, just set output to stdout */ 449 if (!doall) 450 return (stdout); 451 452 /* set output to a temporary file, so if no output don't send mail */ 453 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 454 if ((fd = mkstemp(path)) < 0) 455 return (NULL); 456 return (fdopen(fd, "w+")); 457} 458 459void 460closecal(FILE *fp) 461{ 462 uid_t uid; 463 struct stat sbuf; 464 int nread, pdes[2], status; 465 char buf[1024]; 466 467 if (!doall) 468 return; 469 470 rewind(fp); 471 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 472 goto done; 473 if (pipe(pdes) < 0) 474 goto done; 475 switch (fork()) { 476 case -1: /* error */ 477 (void)close(pdes[0]); 478 (void)close(pdes[1]); 479 goto done; 480 case 0: 481 /* child -- set stdin to pipe output */ 482 if (pdes[0] != STDIN_FILENO) { 483 (void)dup2(pdes[0], STDIN_FILENO); 484 (void)close(pdes[0]); 485 } 486 (void)close(pdes[1]); 487 uid = geteuid(); 488 if (setuid(getuid()) < 0) { 489 warnx("setuid failed"); 490 _exit(1); 491 }; 492 if (setgid(getegid()) < 0) { 493 warnx("setgid failed"); 494 _exit(1); 495 } 496 if (setuid(uid) < 0) { 497 warnx("setuid failed"); 498 _exit(1); 499 } 500 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 501 "\"Reminder Service\"", (char *)NULL); 502 warn(_PATH_SENDMAIL); 503 _exit(1); 504 } 505 /* parent -- write to pipe input */ 506 (void)close(pdes[0]); 507 508 header[1].iov_base = header[3].iov_base = pw->pw_name; 509 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 510 writev(pdes[1], header, 7); 511 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 512 (void)write(pdes[1], buf, nread); 513 (void)close(pdes[1]); 514done: (void)fclose(fp); 515 (void)unlink(path); 516 while (wait(&status) >= 0); 517} 518