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 /* not lint */ 39 40 #ifndef lint 41 static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <stdio.h> 46 #include <ctype.h> 47 #include <sys/types.h> 48 #include <sys/stat.h> 49 #include <unistd.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <locale.h> 53 #include <string.h> 54 #include <sys/uio.h> 55 #include <sys/time.h> 56 #include <stdlib.h> 57 #include <pwd.h> 58 #include <sys/wait.h> 59 60 #include "pathnames.h" 61 #include "calendar.h" 62 63 64 char *calendarFile = "calendar"; /* default calendar file */ 65 char *calendarHome = ".calendar"; /* HOME */ 66 char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */ 67 68 struct fixs neaster, npaskha; 69 70 struct iovec header[] = { 71 {"From: ", 6}, 72 {NULL, 0}, 73 {" (Reminder Service)\nTo: ", 24}, 74 {NULL, 0}, 75 {"\nSubject: ", 10}, 76 {NULL, 0}, 77 {"'s Calendar\nPrecedence: bulk\n\n", 30}, 78 }; 79 80 81 void 82 cal() 83 { 84 register int printing; 85 register char *p; 86 FILE *fp; 87 int ch, l; 88 int month; 89 int day; 90 int var; 91 char buf[2048 + 1]; 92 93 if ((fp = opencal()) == NULL) 94 return; 95 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 96 if ((p = strchr(buf, '\n')) != NULL) 97 *p = '\0'; 98 else 99 while ((ch = getchar()) != '\n' && ch != EOF); 100 for (l = strlen(buf); 101 l > 0 && isspace((unsigned char)buf[l - 1]); 102 l--) 103 ; 104 buf[l] = '\0'; 105 if (buf[0] == '\0') 106 continue; 107 if (strncmp(buf, "LANG=", 5) == 0) { 108 (void) setlocale(LC_ALL, buf + 5); 109 setnnames(); 110 continue; 111 } 112 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) { 113 if (neaster.name != NULL) 114 free(neaster.name); 115 neaster.name = strdup(buf + 7); 116 neaster.len = strlen(buf + 7); 117 continue; 118 } 119 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) { 120 if (npaskha.name != NULL) 121 free(npaskha.name); 122 npaskha.name = strdup(buf + 7); 123 npaskha.len = strlen(buf + 7); 124 continue; 125 } 126 if (buf[0] != '\t') { 127 printing = isnow(buf, &month, &day, &var) ? 1 : 0; 128 if ((p = strchr(buf, '\t')) == NULL) 129 continue; 130 if (p > buf && p[-1] == '*') 131 var = 1; 132 if (printing) { 133 struct tm tm; 134 char dbuf[30]; 135 136 tm.tm_sec = 0; /* unused */ 137 tm.tm_min = 0; /* unused */ 138 tm.tm_hour = 0; /* unused */ 139 tm.tm_wday = 0; /* unused */ 140 tm.tm_mon = month - 1; 141 tm.tm_mday = day; 142 tm.tm_year = tp->tm_year; /* unused */ 143 (void)strftime(dbuf, sizeof(dbuf), "%c", &tm); 144 dbuf[10] = '\0'; 145 (void)fprintf(fp, "%s%c%s\n", 146 dbuf + 4/* skip weekdays */, 147 var ? '*' : ' ', p); 148 } 149 } 150 else if (printing) 151 fprintf(fp, "%s\n", buf); 152 } 153 closecal(fp); 154 } 155 156 int 157 getfield(p, endp, flags) 158 char *p, **endp; 159 int *flags; 160 { 161 int val, var; 162 char *start, savech; 163 164 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 165 if (*p == '*') { /* `*' is current month */ 166 *flags |= F_ISMONTH; 167 *endp = p+1; 168 return (tp->tm_mon + 1); 169 } 170 if (isdigit((unsigned char)*p)) { 171 val = strtol(p, &p, 10); /* if 0, it's failure */ 172 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 173 *endp = p; 174 return (val); 175 } 176 for (start = p; isalpha((unsigned char)*++p);); 177 178 /* Sunday-1 */ 179 if (*p == '+' || *p == '-') 180 for(; isdigit((unsigned char)*++p);); 181 182 savech = *p; 183 *p = '\0'; 184 185 /* Month */ 186 if ((val = getmonth(start)) != 0) 187 *flags |= F_ISMONTH; 188 189 /* Day */ 190 else if ((val = getday(start)) != 0) { 191 *flags |= F_ISDAY; 192 193 /* variable weekday */ 194 if ((var = getdayvar(start)) != 0) { 195 if (var <=5 && var >= -4) 196 val += var * 10; 197 #ifdef DEBUG 198 printf("var: %d\n", var); 199 #endif 200 } 201 } 202 203 /* Easter */ 204 else if ((val = geteaster(start, tp->tm_year + 1900)) != 0) 205 *flags |= F_EASTER; 206 207 /* Paskha */ 208 else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0) 209 *flags |= F_EASTER; 210 211 /* undefined rest */ 212 else { 213 *p = savech; 214 return (0); 215 } 216 for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 217 *endp = p; 218 return (val); 219 } 220 221 char path[MAXPATHLEN + 1]; 222 223 FILE * 224 opencal() 225 { 226 uid_t uid; 227 int fd, pdes[2]; 228 struct stat sbuf; 229 230 /* open up calendar file as stdin */ 231 if (!freopen(calendarFile, "r", stdin)) { 232 if (doall) { 233 if (chdir(calendarHome) != 0) 234 return (NULL); 235 if (stat(calendarNoMail, &sbuf) == 0) 236 return (NULL); 237 if (!freopen(calendarFile, "r", stdin)) 238 return (NULL); 239 } else { 240 chdir(getenv("HOME")); 241 if (!(chdir(calendarHome) == 0 && 242 freopen(calendarFile, "r", stdin))) 243 errx(1, "no calendar file: ``%s'' or ``~/%s/%s\n", calendarFile, calendarHome, calendarFile); 244 } 245 } 246 if (pipe(pdes) < 0) 247 return (NULL); 248 switch (vfork()) { 249 case -1: /* error */ 250 (void)close(pdes[0]); 251 (void)close(pdes[1]); 252 return (NULL); 253 case 0: 254 /* child -- stdin already setup, set stdout to pipe input */ 255 if (pdes[1] != STDOUT_FILENO) { 256 (void)dup2(pdes[1], STDOUT_FILENO); 257 (void)close(pdes[1]); 258 } 259 (void)close(pdes[0]); 260 uid = geteuid(); 261 if (setuid(getuid()) < 0) { 262 fprintf(stderr, "calendar: first setuid failed\n"); 263 _exit(1); 264 }; 265 if (setgid(getegid()) < 0) { 266 fprintf(stderr, "calendar: setgid failed\n"); 267 _exit(1); 268 } 269 if (setuid(uid) < 0) { 270 fprintf(stderr, "calendar: setuid failed\n"); 271 _exit(1); 272 } 273 execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL); 274 (void)fprintf(stderr, 275 "calendar: execl: %s: %s.\n", _PATH_CPP, strerror(errno)); 276 _exit(1); 277 } 278 /* parent -- set stdin to pipe output */ 279 (void)dup2(pdes[0], STDIN_FILENO); 280 (void)close(pdes[0]); 281 (void)close(pdes[1]); 282 283 /* not reading all calendar files, just set output to stdout */ 284 if (!doall) 285 return (stdout); 286 287 /* set output to a temporary file, so if no output don't send mail */ 288 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 289 if ((fd = mkstemp(path)) < 0) 290 return (NULL); 291 return (fdopen(fd, "w+")); 292 } 293 294 void 295 closecal(fp) 296 FILE *fp; 297 { 298 uid_t uid; 299 struct stat sbuf; 300 int nread, pdes[2], status; 301 char buf[1024]; 302 303 if (!doall) 304 return; 305 306 (void)rewind(fp); 307 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 308 goto done; 309 if (pipe(pdes) < 0) 310 goto done; 311 switch (vfork()) { 312 case -1: /* error */ 313 (void)close(pdes[0]); 314 (void)close(pdes[1]); 315 goto done; 316 case 0: 317 /* child -- set stdin to pipe output */ 318 if (pdes[0] != STDIN_FILENO) { 319 (void)dup2(pdes[0], STDIN_FILENO); 320 (void)close(pdes[0]); 321 } 322 (void)close(pdes[1]); 323 uid = geteuid(); 324 if (setuid(getuid()) < 0) { 325 fprintf(stderr, "calendar: setuid failed\n"); 326 _exit(1); 327 }; 328 if (setgid(getegid()) < 0) { 329 fprintf(stderr, "calendar: setgid failed\n"); 330 _exit(1); 331 } 332 if (setuid(uid) < 0) { 333 fprintf(stderr, "calendar: setuid failed\n"); 334 _exit(1); 335 } 336 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 337 "\"Reminder Service\"", NULL); 338 (void)fprintf(stderr, 339 "calendar: %s: %s.\n", _PATH_SENDMAIL, strerror(errno)); 340 _exit(1); 341 } 342 /* parent -- write to pipe input */ 343 (void)close(pdes[0]); 344 345 header[1].iov_base = header[3].iov_base = pw->pw_name; 346 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 347 writev(pdes[1], header, 7); 348 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 349 (void)write(pdes[1], buf, nread); 350 (void)close(pdes[1]); 351 done: (void)fclose(fp); 352 (void)unlink(path); 353 while (wait(&status) >= 0); 354 } 355 356