Annotation of src/usr.bin/calendar/calendar.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: calendar.c,v 1.8 1995/09/02 05:38:38 jtc Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1989, 1993, 1994
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: static char copyright[] =
! 38: "@(#) Copyright (c) 1989, 1993\n\
! 39: The Regents of the University of California. All rights reserved.\n";
! 40: #endif /* not lint */
! 41:
! 42: #ifndef lint
! 43: #if 0
! 44: static char sccsid[] = "@(#)calendar.c 8.4 (Berkeley) 1/7/95";
! 45: #endif
! 46: static char rcsid[] = "$NetBSD: calendar.c,v 1.8 1995/09/02 05:38:38 jtc Exp $";
! 47: #endif /* not lint */
! 48:
! 49: #include <sys/param.h>
! 50: #include <sys/time.h>
! 51: #include <sys/stat.h>
! 52: #include <sys/uio.h>
! 53: #include <sys/wait.h>
! 54:
! 55: #include <ctype.h>
! 56: #include <err.h>
! 57: #include <errno.h>
! 58: #include <fcntl.h>
! 59: #include <pwd.h>
! 60: #include <stdio.h>
! 61: #include <stdlib.h>
! 62: #include <string.h>
! 63: #include <tzfile.h>
! 64: #include <unistd.h>
! 65:
! 66: #include "pathnames.h"
! 67:
! 68: struct passwd *pw;
! 69: int doall;
! 70:
! 71: void cal __P((void));
! 72: void closecal __P((FILE *));
! 73: int getday __P((char *));
! 74: int getfield __P((char *, char **, int *));
! 75: int getmonth __P((char *));
! 76: int isnow __P((char *));
! 77: FILE *opencal __P((void));
! 78: void settime __P((void));
! 79: void usage __P((void));
! 80:
! 81: int
! 82: main(argc, argv)
! 83: int argc;
! 84: char *argv[];
! 85: {
! 86: extern int optind;
! 87: int ch;
! 88: char *caldir;
! 89:
! 90: while ((ch = getopt(argc, argv, "-a")) != EOF)
! 91: switch (ch) {
! 92: case '-': /* backward contemptible */
! 93: case 'a':
! 94: if (getuid()) {
! 95: errno = EPERM;
! 96: err(1, NULL);
! 97: }
! 98: doall = 1;
! 99: break;
! 100: case '?':
! 101: default:
! 102: usage();
! 103: }
! 104: argc -= optind;
! 105: argv += optind;
! 106:
! 107: if (argc)
! 108: usage();
! 109:
! 110: settime();
! 111: if (doall)
! 112: while ((pw = getpwent()) != NULL) {
! 113: (void)setegid(pw->pw_gid);
! 114: (void)seteuid(pw->pw_uid);
! 115: if (!chdir(pw->pw_dir))
! 116: cal();
! 117: (void)seteuid(0);
! 118: }
! 119: else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
! 120: if(!chdir(caldir))
! 121: cal();
! 122: } else
! 123: cal();
! 124: exit(0);
! 125: }
! 126:
! 127: void
! 128: cal()
! 129: {
! 130: register int printing;
! 131: register char *p;
! 132: FILE *fp;
! 133: int ch;
! 134: char buf[2048 + 1];
! 135:
! 136: if ((fp = opencal()) == NULL)
! 137: return;
! 138: for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
! 139: if ((p = strchr(buf, '\n')) != NULL)
! 140: *p = '\0';
! 141: else
! 142: while ((ch = getchar()) != '\n' && ch != EOF);
! 143: if (buf[0] == '\0')
! 144: continue;
! 145: if (buf[0] != '\t')
! 146: printing = isnow(buf) ? 1 : 0;
! 147: if (printing)
! 148: (void)fprintf(fp, "%s\n", buf);
! 149: }
! 150: closecal(fp);
! 151: }
! 152:
! 153: struct iovec header[] = {
! 154: "From: ", 6,
! 155: NULL, 0,
! 156: " (Reminder Service)\nTo: ", 24,
! 157: NULL, 0,
! 158: "\nSubject: ", 10,
! 159: NULL, 0,
! 160: "'s Calendar\nPrecedence: bulk\n\n", 30,
! 161: };
! 162:
! 163: /* 1-based month, 0-based days, cumulative */
! 164: int daytab[][14] = {
! 165: 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364,
! 166: 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365,
! 167: };
! 168: struct tm *tp;
! 169: int *cumdays, offset, yrdays;
! 170: char dayname[10];
! 171:
! 172: void
! 173: settime()
! 174: {
! 175: time_t now;
! 176:
! 177: (void)time(&now);
! 178: tp = localtime(&now);
! 179: if (isleap(tp->tm_year + 1900)) {
! 180: yrdays = DAYSPERLYEAR;
! 181: cumdays = daytab[1];
! 182: } else {
! 183: yrdays = DAYSPERNYEAR;
! 184: cumdays = daytab[0];
! 185: }
! 186: /* Friday displays Monday's events */
! 187: offset = tp->tm_wday == 5 ? 3 : 1;
! 188: header[5].iov_base = dayname;
! 189: header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
! 190: }
! 191:
! 192: /*
! 193: * Possible date formats include any combination of:
! 194: * 3-charmonth (January, Jan, Jan)
! 195: * 3-charweekday (Friday, Monday, mon.)
! 196: * numeric month or day (1, 2, 04)
! 197: *
! 198: * Any character may separate them, or they may not be separated. Any line,
! 199: * following a line that is matched, that starts with "whitespace", is shown
! 200: * along with the matched line.
! 201: */
! 202: int
! 203: isnow(endp)
! 204: char *endp;
! 205: {
! 206: int day, flags, month, v1, v2;
! 207:
! 208: #define F_ISMONTH 0x01
! 209: #define F_ISDAY 0x02
! 210: flags = 0;
! 211: /* didn't recognize anything, skip it */
! 212: if (!(v1 = getfield(endp, &endp, &flags)))
! 213: return (0);
! 214: if (flags & F_ISDAY || v1 > 12) {
! 215: /* found a day */
! 216: day = v1;
! 217: month = tp->tm_mon + 1;
! 218: } else if (flags & F_ISMONTH) {
! 219: month = v1;
! 220: /* if no recognizable day, assume the first */
! 221: if (!(day = getfield(endp, &endp, &flags)))
! 222: day = 1;
! 223: } else {
! 224: v2 = getfield(endp, &endp, &flags);
! 225: if (flags & F_ISMONTH) {
! 226: day = v1;
! 227: month = v2;
! 228: } else {
! 229: /* F_ISDAY set, v2 > 12, or no way to tell */
! 230: month = v1;
! 231: /* if no recognizable day, assume the first */
! 232: day = v2 ? v2 : 1;
! 233: }
! 234: }
! 235: if (flags & F_ISDAY)
! 236: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
! 237: day = cumdays[month] + day;
! 238:
! 239: /* if today or today + offset days */
! 240: if (day >= tp->tm_yday && day <= tp->tm_yday + offset)
! 241: return (1);
! 242: /* if number of days left in this year + days to event in next year */
! 243: if (yrdays - tp->tm_yday + day <= offset)
! 244: return (1);
! 245: return (0);
! 246: }
! 247:
! 248: int
! 249: getfield(p, endp, flags)
! 250: char *p, **endp;
! 251: int *flags;
! 252: {
! 253: int val;
! 254: char *start, savech;
! 255:
! 256: for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
! 257: if (*p == '*') { /* `*' is current month */
! 258: *flags |= F_ISMONTH;
! 259: *endp = p+1;
! 260: return (tp->tm_mon + 1);
! 261: }
! 262: if (isdigit(*p)) {
! 263: val = strtol(p, &p, 10); /* if 0, it's failure */
! 264: for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
! 265: *endp = p;
! 266: return (val);
! 267: }
! 268: for (start = p; isalpha(*++p););
! 269: savech = *p;
! 270: *p = '\0';
! 271: if ((val = getmonth(start)) != 0)
! 272: *flags |= F_ISMONTH;
! 273: else if ((val = getday(start)) != 0)
! 274: *flags |= F_ISDAY;
! 275: else {
! 276: *p = savech;
! 277: return (0);
! 278: }
! 279: for (*p = savech; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
! 280: *endp = p;
! 281: return (val);
! 282: }
! 283:
! 284: char path[MAXPATHLEN + 1];
! 285:
! 286: FILE *
! 287: opencal()
! 288: {
! 289: int fd, pdes[2];
! 290:
! 291: /* open up calendar file as stdin */
! 292: if (!freopen("calendar", "r", stdin)) {
! 293: if (doall)
! 294: return (NULL);
! 295: errx(1, "no calendar file.");
! 296: }
! 297: if (pipe(pdes) < 0)
! 298: return (NULL);
! 299: switch (vfork()) {
! 300: case -1: /* error */
! 301: (void)close(pdes[0]);
! 302: (void)close(pdes[1]);
! 303: return (NULL);
! 304: case 0:
! 305: /* child -- stdin already setup, set stdout to pipe input */
! 306: if (pdes[1] != STDOUT_FILENO) {
! 307: (void)dup2(pdes[1], STDOUT_FILENO);
! 308: (void)close(pdes[1]);
! 309: }
! 310: (void)close(pdes[0]);
! 311: execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL);
! 312: warn("execl: %s", _PATH_CPP);
! 313: _exit(1);
! 314: }
! 315: /* parent -- set stdin to pipe output */
! 316: (void)dup2(pdes[0], STDIN_FILENO);
! 317: (void)close(pdes[0]);
! 318: (void)close(pdes[1]);
! 319:
! 320: /* not reading all calendar files, just set output to stdout */
! 321: if (!doall)
! 322: return (stdout);
! 323:
! 324: /* set output to a temporary file, so if no output don't send mail */
! 325: (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
! 326: if ((fd = mkstemp(path)) < 0)
! 327: return (NULL);
! 328: return (fdopen(fd, "w+"));
! 329: }
! 330:
! 331: void
! 332: closecal(fp)
! 333: FILE *fp;
! 334: {
! 335: struct stat sbuf;
! 336: int nread, pdes[2], status;
! 337: char buf[1024];
! 338:
! 339: if (!doall)
! 340: return;
! 341:
! 342: (void)rewind(fp);
! 343: if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
! 344: goto done;
! 345: if (pipe(pdes) < 0)
! 346: goto done;
! 347: switch (vfork()) {
! 348: case -1: /* error */
! 349: (void)close(pdes[0]);
! 350: (void)close(pdes[1]);
! 351: goto done;
! 352: case 0:
! 353: /* child -- set stdin to pipe output */
! 354: if (pdes[0] != STDIN_FILENO) {
! 355: (void)dup2(pdes[0], STDIN_FILENO);
! 356: (void)close(pdes[0]);
! 357: }
! 358: (void)close(pdes[1]);
! 359: execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
! 360: "\"Reminder Service\"", "-f", "root", NULL);
! 361: warn("execl: %s", _PATH_SENDMAIL);
! 362: _exit(1);
! 363: }
! 364: /* parent -- write to pipe input */
! 365: (void)close(pdes[0]);
! 366:
! 367: header[1].iov_base = header[3].iov_base = pw->pw_name;
! 368: header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
! 369: writev(pdes[1], header, 7);
! 370: while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
! 371: (void)write(pdes[1], buf, nread);
! 372: (void)close(pdes[1]);
! 373: done: (void)fclose(fp);
! 374: (void)unlink(path);
! 375: while (wait(&status) >= 0);
! 376: }
! 377:
! 378: static char *months[] = {
! 379: "jan", "feb", "mar", "apr", "may", "jun",
! 380: "jul", "aug", "sep", "oct", "nov", "dec", NULL,
! 381: };
! 382:
! 383: int
! 384: getmonth(s)
! 385: register char *s;
! 386: {
! 387: register char **p;
! 388:
! 389: for (p = months; *p; ++p)
! 390: if (!strncasecmp(s, *p, 3))
! 391: return ((p - months) + 1);
! 392: return (0);
! 393: }
! 394:
! 395: static char *days[] = {
! 396: "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
! 397: };
! 398:
! 399: int
! 400: getday(s)
! 401: register char *s;
! 402: {
! 403: register char **p;
! 404:
! 405: for (p = days; *p; ++p)
! 406: if (!strncasecmp(s, *p, 3))
! 407: return ((p - days) + 1);
! 408: return (0);
! 409: }
! 410:
! 411: void
! 412: usage()
! 413: {
! 414: (void)fprintf(stderr, "usage: calendar [-a]\n");
! 415: exit(1);
! 416: }
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