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 char copyright[] = 36 "@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/time.h> 46 #include <sys/stat.h> 47 #include <sys/uio.h> 48 #include <sys/wait.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <tzfile.h> 59 #include <unistd.h> 60 61 #include "pathnames.h" 62 63 struct passwd *pw; 64 int doall; 65 66 void cal __P((void)); 67 void closecal __P((FILE *)); 68 int getday __P((char *)); 69 int getfield __P((char *, char **, int *)); 70 int getmonth __P((char *)); 71 int isnow __P((char *)); 72 FILE *opencal __P((void)); 73 void settime __P((void)); 74 void usage __P((void)); 75 76 int 77 main(argc, argv) 78 int argc; 79 char *argv[]; 80 { 81 extern int optind; 82 int ch; 83 84 while ((ch = getopt(argc, argv, "-a")) != EOF) 85 switch (ch) { 86 case '-': /* backward contemptible */ 87 case 'a': 88 if (getuid()) { 89 errno = EPERM; 90 err(1, NULL); 91 } 92 doall = 1; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (argc) 102 usage(); 103 104 settime(); 105 if (doall) 106 while ((pw = getpwent()) != NULL) { 107 (void)setegid(pw->pw_gid); 108 (void)seteuid(pw->pw_uid); 109 if (!chdir(pw->pw_dir)) 110 cal(); 111 (void)seteuid(0); 112 } 113 else 114 cal(); 115 exit(0); 116 } 117 118 void 119 cal() 120 { 121 register int printing; 122 register char *p; 123 FILE *fp; 124 int ch; 125 char buf[2048 + 1]; 126 127 if ((fp = opencal()) == NULL) 128 return; 129 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 130 if ((p = strchr(buf, '\n')) != NULL) 131 *p = '\0'; 132 else 133 while ((ch = getchar()) != '\n' && ch != EOF); 134 if (buf[0] == '\0') 135 continue; 136 if (buf[0] != '\t') 137 printing = isnow(buf) ? 1 : 0; 138 if (printing) 139 (void)fprintf(fp, "%s\n", buf); 140 } 141 closecal(fp); 142 } 143 144 struct iovec header[] = { 145 "From: ", 6, 146 NULL, 0, 147 " (Reminder Service)\nTo: ", 24, 148 NULL, 0, 149 "\nSubject: ", 10, 150 NULL, 0, 151 "'s Calendar\nPrecedence: bulk\n\n", 30, 152 }; 153 154 /* 1-based month, 0-based days, cumulative */ 155 int daytab[][14] = { 156 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364, 157 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365, 158 }; 159 struct tm *tp; 160 int *cumdays, offset, yrdays; 161 char dayname[10]; 162 163 void 164 settime() 165 { 166 time_t now; 167 168 (void)time(&now); 169 tp = localtime(&now); 170 if (isleap(tp->tm_year + 1900)) { 171 yrdays = DAYSPERLYEAR; 172 cumdays = daytab[1]; 173 } else { 174 yrdays = DAYSPERNYEAR; 175 cumdays = daytab[0]; 176 } 177 /* Friday displays Monday's events */ 178 offset = tp->tm_wday == 5 ? 3 : 1; 179 header[5].iov_base = dayname; 180 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 181 } 182 183 /* 184 * Possible date formats include any combination of: 185 * 3-charmonth (January, Jan, Jan) 186 * 3-charweekday (Friday, Monday, mon.) 187 * numeric month or day (1, 2, 04) 188 * 189 * Any character may separate them, or they may not be separated. Any line, 190 * following a line that is matched, that starts with "whitespace", is shown 191 * along with the matched line. 192 */ 193 int 194 isnow(endp) 195 char *endp; 196 { 197 int day, flags, month, v1, v2; 198 199 #define F_ISMONTH 0x01 200 #define F_ISDAY 0x02 201 flags = 0; 202 /* didn't recognize anything, skip it */ 203 if (!(v1 = getfield(endp, &endp, &flags))) 204 return (0); 205 if (flags & F_ISDAY || v1 > 12) { 206 /* found a day */ 207 day = v1; 208 /* if no recognizable month, assume just a day alone */ 209 if (!(month = getfield(endp, &endp, &flags))) 210 month = tp->tm_mon + 1; 211 } else if (flags & F_ISMONTH) { 212 month = v1; 213 /* if no recognizable day, assume the first */ 214 if (!(day = getfield(endp, &endp, &flags))) 215 day = 1; 216 } else { 217 v2 = getfield(endp, &endp, &flags); 218 if (flags & F_ISMONTH) { 219 day = v1; 220 month = v2; 221 } else { 222 /* F_ISDAY set, v2 > 12, or no way to tell */ 223 month = v1; 224 /* if no recognizable day, assume the first */ 225 day = v2 ? v2 : 1; 226 } 227 } 228 if (flags & F_ISDAY) 229 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 230 day = cumdays[month] + day; 231 232 /* if today or today + offset days */ 233 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 234 return (1); 235 /* if number of days left in this year + days to event in next year */ 236 if (yrdays - tp->tm_yday + day <= offset) 237 return (1); 238 return (0); 239 } 240 241 int 242 getfield(p, endp, flags) 243 char *p, **endp; 244 int *flags; 245 { 246 int val; 247 char *start, savech; 248 249 for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p); 250 if (*p == '*') { /* `*' is current month */ 251 *flags |= F_ISMONTH; 252 *endp = p+1; 253 return (tp->tm_mon + 1); 254 } 255 if (isdigit(*p)) { 256 val = strtol(p, &p, 10); /* if 0, it's failure */ 257 for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p); 258 *endp = p; 259 return (val); 260 } 261 for (start = p; isalpha(*++p);); 262 savech = *p; 263 *p = '\0'; 264 if ((val = getmonth(start)) != 0) 265 *flags |= F_ISMONTH; 266 else if ((val = getday(start)) != 0) 267 *flags |= F_ISDAY; 268 else { 269 *p = savech; 270 return (0); 271 } 272 for (*p = savech; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p); 273 *endp = p; 274 return (val); 275 } 276 277 char path[MAXPATHLEN + 1]; 278 279 FILE * 280 opencal() 281 { 282 int fd, pdes[2]; 283 284 /* open up calendar file as stdin */ 285 if (!freopen("calendar", "r", stdin)) { 286 if (doall) 287 return (NULL); 288 errx(1, "no calendar file."); 289 } 290 if (pipe(pdes) < 0) 291 return (NULL); 292 switch (vfork()) { 293 case -1: /* error */ 294 (void)close(pdes[0]); 295 (void)close(pdes[1]); 296 return (NULL); 297 case 0: 298 /* child -- stdin already setup, set stdout to pipe input */ 299 if (pdes[1] != STDOUT_FILENO) { 300 (void)dup2(pdes[1], STDOUT_FILENO); 301 (void)close(pdes[1]); 302 } 303 (void)close(pdes[0]); 304 execl(_PATH_CPP, "cpp", "-I.", _PATH_INCLUDE, NULL); 305 (void)fprintf(stderr, 306 "calendar: execl: %s: %s.\n", _PATH_CPP, strerror(errno)); 307 _exit(1); 308 } 309 /* parent -- set stdin to pipe output */ 310 (void)dup2(pdes[0], STDIN_FILENO); 311 (void)close(pdes[0]); 312 (void)close(pdes[1]); 313 314 /* not reading all calendar files, just set output to stdout */ 315 if (!doall) 316 return (stdout); 317 318 /* set output to a temporary file, so if no output don't send mail */ 319 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 320 if ((fd = mkstemp(path)) < 0) 321 return (NULL); 322 return (fdopen(fd, "w+")); 323 } 324 325 void 326 closecal(fp) 327 FILE *fp; 328 { 329 struct stat sbuf; 330 int nread, pdes[2], status; 331 char buf[1024]; 332 333 if (!doall) 334 return; 335 336 (void)rewind(fp); 337 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 338 goto done; 339 if (pipe(pdes) < 0) 340 goto done; 341 switch (vfork()) { 342 case -1: /* error */ 343 (void)close(pdes[0]); 344 (void)close(pdes[1]); 345 goto done; 346 case 0: 347 /* child -- set stdin to pipe output */ 348 if (pdes[0] != STDIN_FILENO) { 349 (void)dup2(pdes[0], STDIN_FILENO); 350 (void)close(pdes[0]); 351 } 352 (void)close(pdes[1]); 353 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 354 "\"Reminder Service\"", "-f", "root", NULL); 355 (void)fprintf(stderr, 356 "calendar: %s: %s.\n", _PATH_SENDMAIL, strerror(errno)); 357 _exit(1); 358 } 359 /* parent -- write to pipe input */ 360 (void)close(pdes[0]); 361 362 header[1].iov_base = header[3].iov_base = pw->pw_name; 363 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 364 writev(pdes[1], header, 7); 365 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 366 (void)write(pdes[1], buf, nread); 367 (void)close(pdes[1]); 368 done: (void)fclose(fp); 369 (void)unlink(path); 370 while (wait(&status) >= 0); 371 } 372 373 static char *months[] = { 374 "jan", "feb", "mar", "apr", "may", "jun", 375 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 376 }; 377 378 int 379 getmonth(s) 380 register char *s; 381 { 382 register char **p; 383 384 for (p = months; *p; ++p) 385 if (!strncasecmp(s, *p, 3)) 386 return ((p - months) + 1); 387 return (0); 388 } 389 390 static char *days[] = { 391 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 392 }; 393 394 int 395 getday(s) 396 register char *s; 397 { 398 register char **p; 399 400 for (p = days; *p; ++p) 401 if (!strncasecmp(s, *p, 3)) 402 return ((p - days) + 1); 403 return (0); 404 } 405 406 void 407 usage() 408 { 409 (void)fprintf(stderr, "usage: calendar [-a]\n"); 410 exit(1); 411 } 412