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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1989, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 46 #endif 47 48 #include <sys/types.h> 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 #include <sys/uio.h> 53 #include <sys/wait.h> 54 #include <ctype.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <langinfo.h> 58 #include <locale.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "pathnames.h" 66 #include "calendar.h" 67 68 69 const char *calendarFile = "calendar"; /* default calendar file */ 70 const char *calendarHome = ".calendar"; /* HOME */ 71 const char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */ 72 73 struct fixs neaster, npaskha; 74 75 struct iovec header[] = { 76 {"From: ", 6}, 77 {NULL, 0}, 78 {" (Reminder Service)\nTo: ", 24}, 79 {NULL, 0}, 80 {"\nSubject: ", 10}, 81 {NULL, 0}, 82 {"'s Calendar\nPrecedence: bulk\n\n", 30}, 83 }; 84 85 86 void 87 cal() 88 { 89 int printing; 90 char *p; 91 FILE *fp; 92 int ch, l; 93 int month; 94 int day; 95 int var; 96 static int d_first = -1; 97 char buf[2048 + 1]; 98 99 if ((fp = opencal()) == NULL) 100 return; 101 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 102 if ((p = strchr(buf, '\n')) != NULL) 103 *p = '\0'; 104 else 105 while ((ch = getchar()) != '\n' && ch != EOF); 106 for (l = strlen(buf); 107 l > 0 && isspace((unsigned char)buf[l - 1]); 108 l--) 109 ; 110 buf[l] = '\0'; 111 if (buf[0] == '\0') 112 continue; 113 if (strncmp(buf, "LANG=", 5) == 0) { 114 (void) setlocale(LC_ALL, buf + 5); 115 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 116 setnnames(); 117 continue; 118 } 119 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) { 120 if (neaster.name != NULL) 121 free(neaster.name); 122 if ((neaster.name = strdup(buf + 7)) == NULL) 123 errx(1, "cannot allocate memory"); 124 neaster.len = strlen(buf + 7); 125 continue; 126 } 127 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) { 128 if (npaskha.name != NULL) 129 free(npaskha.name); 130 if ((npaskha.name = strdup(buf + 7)) == NULL) 131 errx(1, "cannot allocate memory"); 132 npaskha.len = strlen(buf + 7); 133 continue; 134 } 135 if (buf[0] != '\t') { 136 printing = isnow(buf, &month, &day, &var) ? 1 : 0; 137 if ((p = strchr(buf, '\t')) == NULL) 138 continue; 139 if (p > buf && p[-1] == '*') 140 var = 1; 141 if (printing) { 142 struct tm tm; 143 char dbuf[80]; 144 145 if (d_first < 0) 146 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 147 tm.tm_sec = 0; /* unused */ 148 tm.tm_min = 0; /* unused */ 149 tm.tm_hour = 0; /* unused */ 150 tm.tm_wday = 0; /* unused */ 151 tm.tm_mon = month - 1; 152 tm.tm_mday = day; 153 tm.tm_year = tp->tm_year; /* unused */ 154 (void)strftime(dbuf, sizeof(dbuf), 155 d_first ? "%e %b" : "%b %e", 156 &tm); 157 (void)fprintf(fp, "%s%c%s\n", dbuf, 158 var ? '*' : ' ', p); 159 } 160 } 161 else if (printing) 162 fprintf(fp, "%s\n", buf); 163 } 164 closecal(fp); 165 } 166 167 int 168 getfield(p, endp, flags) 169 char *p, **endp; 170 int *flags; 171 { 172 int val, var; 173 char *start, savech; 174 175 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 176 if (*p == '*') { /* `*' is current month */ 177 *flags |= F_ISMONTH; 178 *endp = p+1; 179 return (tp->tm_mon + 1); 180 } 181 if (isdigit((unsigned char)*p)) { 182 val = strtol(p, &p, 10); /* if 0, it's failure */ 183 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 184 *endp = p; 185 return (val); 186 } 187 for (start = p; isalpha((unsigned char)*++p);); 188 189 /* Sunday-1 */ 190 if (*p == '+' || *p == '-') 191 for(; isdigit((unsigned char)*++p);); 192 193 savech = *p; 194 *p = '\0'; 195 196 /* Month */ 197 if ((val = getmonth(start)) != 0) 198 *flags |= F_ISMONTH; 199 200 /* Day */ 201 else if ((val = getday(start)) != 0) { 202 *flags |= F_ISDAY; 203 204 /* variable weekday */ 205 if ((var = getdayvar(start)) != 0) { 206 if (var <=5 && var >= -4) 207 val += var * 10; 208 #ifdef DEBUG 209 printf("var: %d\n", var); 210 #endif 211 } 212 } 213 214 /* Easter */ 215 else if ((val = geteaster(start, tp->tm_year + 1900)) != 0) 216 *flags |= F_EASTER; 217 218 /* Paskha */ 219 else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0) 220 *flags |= F_EASTER; 221 222 /* undefined rest */ 223 else { 224 *p = savech; 225 return (0); 226 } 227 for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p); 228 *endp = p; 229 return (val); 230 } 231 232 char path[MAXPATHLEN]; 233 234 FILE * 235 opencal() 236 { 237 uid_t uid; 238 int fd, pdes[2]; 239 struct stat sbuf; 240 241 /* open up calendar file as stdin */ 242 if (!freopen(calendarFile, "r", stdin)) { 243 if (doall) { 244 if (chdir(calendarHome) != 0) 245 return (NULL); 246 if (stat(calendarNoMail, &sbuf) == 0) 247 return (NULL); 248 if (!freopen(calendarFile, "r", stdin)) 249 return (NULL); 250 } else { 251 chdir(getenv("HOME")); 252 if (!(chdir(calendarHome) == 0 && 253 freopen(calendarFile, "r", stdin))) 254 errx(1, "no calendar file: ``%s'' or ``~/%s/%s\n", calendarFile, calendarHome, calendarFile); 255 } 256 } 257 if (pipe(pdes) < 0) 258 return (NULL); 259 switch (fork()) { 260 case -1: /* error */ 261 (void)close(pdes[0]); 262 (void)close(pdes[1]); 263 return (NULL); 264 case 0: 265 /* child -- stdin already setup, set stdout to pipe input */ 266 if (pdes[1] != STDOUT_FILENO) { 267 (void)dup2(pdes[1], STDOUT_FILENO); 268 (void)close(pdes[1]); 269 } 270 (void)close(pdes[0]); 271 uid = geteuid(); 272 if (setuid(getuid()) < 0) { 273 warnx("first setuid failed"); 274 _exit(1); 275 }; 276 if (setgid(getegid()) < 0) { 277 warnx("setgid failed"); 278 _exit(1); 279 } 280 if (setuid(uid) < 0) { 281 warnx("setuid failed"); 282 _exit(1); 283 } 284 execl(_PATH_CPP, "cpp", "-P", 285 "-traditional", "-nostdinc", /* GCC specific opts */ 286 "-I.", "-I", _PATH_INCLUDE, (char *)NULL); 287 warn(_PATH_CPP); 288 _exit(1); 289 } 290 /* parent -- set stdin to pipe output */ 291 (void)dup2(pdes[0], STDIN_FILENO); 292 (void)close(pdes[0]); 293 (void)close(pdes[1]); 294 295 /* not reading all calendar files, just set output to stdout */ 296 if (!doall) 297 return (stdout); 298 299 /* set output to a temporary file, so if no output don't send mail */ 300 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 301 if ((fd = mkstemp(path)) < 0) 302 return (NULL); 303 return (fdopen(fd, "w+")); 304 } 305 306 void 307 closecal(fp) 308 FILE *fp; 309 { 310 uid_t uid; 311 struct stat sbuf; 312 int nread, pdes[2], status; 313 char buf[1024]; 314 315 if (!doall) 316 return; 317 318 (void)rewind(fp); 319 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 320 goto done; 321 if (pipe(pdes) < 0) 322 goto done; 323 switch (fork()) { 324 case -1: /* error */ 325 (void)close(pdes[0]); 326 (void)close(pdes[1]); 327 goto done; 328 case 0: 329 /* child -- set stdin to pipe output */ 330 if (pdes[0] != STDIN_FILENO) { 331 (void)dup2(pdes[0], STDIN_FILENO); 332 (void)close(pdes[0]); 333 } 334 (void)close(pdes[1]); 335 uid = geteuid(); 336 if (setuid(getuid()) < 0) { 337 warnx("setuid failed"); 338 _exit(1); 339 }; 340 if (setgid(getegid()) < 0) { 341 warnx("setgid failed"); 342 _exit(1); 343 } 344 if (setuid(uid) < 0) { 345 warnx("setuid failed"); 346 _exit(1); 347 } 348 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 349 "\"Reminder Service\"", (char *)NULL); 350 warn(_PATH_SENDMAIL); 351 _exit(1); 352 } 353 /* parent -- write to pipe input */ 354 (void)close(pdes[0]); 355 356 header[1].iov_base = header[3].iov_base = pw->pw_name; 357 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 358 writev(pdes[1], header, 7); 359 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 360 (void)write(pdes[1], buf, nread); 361 (void)close(pdes[1]); 362 done: (void)fclose(fp); 363 (void)unlink(path); 364 while (wait(&status) >= 0); 365 } 366