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() 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]; 99 100 if ((fp = opencal()) == NULL) 101 return; 102 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 103 if ((p = strchr(buf, '\n')) != NULL) 104 *p = '\0'; 105 else 106 while ((ch = getchar()) != '\n' && ch != EOF); 107 for (l = strlen(buf); 108 l > 0 && isspace((unsigned char)buf[l - 1]); 109 l--) 110 ; 111 buf[l] = '\0'; 112 if (buf[0] == '\0') 113 continue; 114 if (strncmp(buf, "LANG=", 5) == 0) { 115 (void) setlocale(LC_ALL, buf + 5); 116 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 117 setnnames(); 118 continue; 119 } 120 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) { 121 if (neaster.name != NULL) 122 free(neaster.name); 123 if ((neaster.name = strdup(buf + 7)) == NULL) 124 errx(1, "cannot allocate memory"); 125 neaster.len = strlen(buf + 7); 126 continue; 127 } 128 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) { 129 if (npaskha.name != NULL) 130 free(npaskha.name); 131 if ((npaskha.name = strdup(buf + 7)) == NULL) 132 errx(1, "cannot allocate memory"); 133 npaskha.len = strlen(buf + 7); 134 continue; 135 } 136 if (buf[0] != '\t') { 137 printing = isnow(buf, &month, &day, &var) ? 1 : 0; 138 if ((p = strchr(buf, '\t')) == NULL) 139 continue; 140 if (p > buf && p[-1] == '*') 141 var = 1; 142 if (printing) { 143 struct tm tm; 144 char dbuf[80]; 145 146 if (d_first < 0) 147 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 148 tm.tm_sec = 0; /* unused */ 149 tm.tm_min = 0; /* unused */ 150 tm.tm_hour = 0; /* unused */ 151 tm.tm_wday = 0; /* unused */ 152 tm.tm_mon = month - 1; 153 tm.tm_mday = day; 154 tm.tm_year = tp->tm_year; /* unused */ 155 (void)strftime(dbuf, sizeof(dbuf), 156 d_first ? "%e %b" : "%b %e", 157 &tm); 158 (void)fprintf(fp, "%s%c%s\n", dbuf, 159 var ? '*' : ' ', p); 160 } 161 } 162 else if (printing) 163 fprintf(fp, "%s\n", buf); 164 } 165 closecal(fp); 166 } 167 168 int 169 getfield(p, endp, flags) 170 char *p, **endp; 171 int *flags; 172 { 173 int val, var; 174 char *start, savech; 175 176 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 177 if (*p == '*') { /* `*' is current month */ 178 *flags |= F_ISMONTH; 179 *endp = p+1; 180 return (tp->tm_mon + 1); 181 } 182 if (isdigit((unsigned char)*p)) { 183 val = strtol(p, &p, 10); /* if 0, it's failure */ 184 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 185 *endp = p; 186 return (val); 187 } 188 for (start = p; isalpha((unsigned char)*++p);); 189 190 /* Sunday-1 */ 191 if (*p == '+' || *p == '-') 192 for(; isdigit((unsigned char)*++p);); 193 194 savech = *p; 195 *p = '\0'; 196 197 /* Month */ 198 if ((val = getmonth(start)) != 0) 199 *flags |= F_ISMONTH; 200 201 /* Day */ 202 else if ((val = getday(start)) != 0) { 203 *flags |= F_ISDAY; 204 205 /* variable weekday */ 206 if ((var = getdayvar(start)) != 0) { 207 if (var <=5 && var >= -4) 208 val += var * 10; 209 #ifdef DEBUG 210 printf("var: %d\n", var); 211 #endif 212 } 213 } 214 215 /* Easter */ 216 else if ((val = geteaster(start, tp->tm_year + 1900)) != 0) 217 *flags |= F_EASTER; 218 219 /* Paskha */ 220 else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0) 221 *flags |= F_EASTER; 222 223 /* undefined rest */ 224 else { 225 *p = savech; 226 return (0); 227 } 228 for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 229 *endp = p; 230 return (val); 231 } 232 233 char path[MAXPATHLEN]; 234 235 FILE * 236 opencal() 237 { 238 uid_t uid; 239 size_t i; 240 int fd, found, pdes[2]; 241 struct stat sbuf; 242 243 /* open up calendar file as stdin */ 244 if (!freopen(calendarFile, "r", stdin)) { 245 if (doall) { 246 if (chdir(calendarHomes[0]) != 0) 247 return (NULL); 248 if (stat(calendarNoMail, &sbuf) == 0) 249 return (NULL); 250 if (!freopen(calendarFile, "r", stdin)) 251 return (NULL); 252 } else { 253 chdir(getenv("HOME")); 254 for (found = i = 0; i < sizeof(calendarHomes) / 255 sizeof(calendarHomes[0]); i++) 256 if (chdir(calendarHomes[i]) == 0 && 257 freopen(calendarFile, "r", stdin)) { 258 found = 1; 259 break; 260 } 261 if (!found) 262 errx(1, "no calendar file: ``%s''", calendarFile); 263 } 264 } 265 if (pipe(pdes) < 0) 266 return (NULL); 267 switch (fork()) { 268 case -1: /* error */ 269 (void)close(pdes[0]); 270 (void)close(pdes[1]); 271 return (NULL); 272 case 0: 273 /* child -- stdin already setup, set stdout to pipe input */ 274 if (pdes[1] != STDOUT_FILENO) { 275 (void)dup2(pdes[1], STDOUT_FILENO); 276 (void)close(pdes[1]); 277 } 278 (void)close(pdes[0]); 279 uid = geteuid(); 280 if (setuid(getuid()) < 0) { 281 warnx("first setuid failed"); 282 _exit(1); 283 }; 284 if (setgid(getegid()) < 0) { 285 warnx("setgid failed"); 286 _exit(1); 287 } 288 if (setuid(uid) < 0) { 289 warnx("setuid failed"); 290 _exit(1); 291 } 292 execl(_PATH_CPP, "cpp", "-P", 293 "-traditional", "-nostdinc", /* GCC specific opts */ 294 "-I.", "-I", _PATH_INCLUDE, (char *)NULL); 295 warn(_PATH_CPP); 296 _exit(1); 297 } 298 /* parent -- set stdin to pipe output */ 299 (void)dup2(pdes[0], STDIN_FILENO); 300 (void)close(pdes[0]); 301 (void)close(pdes[1]); 302 303 /* not reading all calendar files, just set output to stdout */ 304 if (!doall) 305 return (stdout); 306 307 /* set output to a temporary file, so if no output don't send mail */ 308 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 309 if ((fd = mkstemp(path)) < 0) 310 return (NULL); 311 return (fdopen(fd, "w+")); 312 } 313 314 void 315 closecal(fp) 316 FILE *fp; 317 { 318 uid_t uid; 319 struct stat sbuf; 320 int nread, pdes[2], status; 321 char buf[1024]; 322 323 if (!doall) 324 return; 325 326 (void)rewind(fp); 327 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 328 goto done; 329 if (pipe(pdes) < 0) 330 goto done; 331 switch (fork()) { 332 case -1: /* error */ 333 (void)close(pdes[0]); 334 (void)close(pdes[1]); 335 goto done; 336 case 0: 337 /* child -- set stdin to pipe output */ 338 if (pdes[0] != STDIN_FILENO) { 339 (void)dup2(pdes[0], STDIN_FILENO); 340 (void)close(pdes[0]); 341 } 342 (void)close(pdes[1]); 343 uid = geteuid(); 344 if (setuid(getuid()) < 0) { 345 warnx("setuid failed"); 346 _exit(1); 347 }; 348 if (setgid(getegid()) < 0) { 349 warnx("setgid failed"); 350 _exit(1); 351 } 352 if (setuid(uid) < 0) { 353 warnx("setuid failed"); 354 _exit(1); 355 } 356 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 357 "\"Reminder Service\"", (char *)NULL); 358 warn(_PATH_SENDMAIL); 359 _exit(1); 360 } 361 /* parent -- write to pipe input */ 362 (void)close(pdes[0]); 363 364 header[1].iov_base = header[3].iov_base = pw->pw_name; 365 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 366 writev(pdes[1], header, 7); 367 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 368 (void)write(pdes[1], buf, nread); 369 (void)close(pdes[1]); 370 done: (void)fclose(fp); 371 (void)unlink(path); 372 while (wait(&status) >= 0); 373 } 374