Annotation of src/usr.bin/calendar/calendar.c, Revision 1.17
1.17 ! millert 1: /* $OpenBSD: calendar.c,v 1.16 2001/09/26 20:38:55 mickey Exp $ */
1.1 deraadt 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
1.5 millert 37: static const char copyright[] =
1.1 deraadt 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
1.5 millert 44: static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
45: #else
1.17 ! millert 46: static char rcsid[] = "$OpenBSD: calendar.c,v 1.16 2001/09/26 20:38:55 mickey Exp $";
1.1 deraadt 47: #endif
48: #endif /* not lint */
49:
1.15 pjanzen 50: #include <sys/stat.h>
51: #include <sys/types.h>
52: #include <sys/wait.h>
1.1 deraadt 53: #include <err.h>
54: #include <errno.h>
1.5 millert 55: #include <locale.h>
1.15 pjanzen 56: #include <login_cap.h>
1.1 deraadt 57: #include <pwd.h>
1.15 pjanzen 58: #include <signal.h>
1.1 deraadt 59: #include <stdio.h>
60: #include <stdlib.h>
61: #include <string.h>
1.5 millert 62: #include <time.h>
1.12 pjanzen 63: #include <tzfile.h>
1.1 deraadt 64: #include <unistd.h>
65:
66: #include "pathnames.h"
1.5 millert 67: #include "calendar.h"
1.1 deraadt 68:
1.15 pjanzen 69: char *calendarFile = "calendar"; /* default calendar file */
70: char *calendarHome = ".calendar"; /* HOME */
71: char *calendarNoMail = "nomail"; /* don't sent mail if this file exists */
72:
1.1 deraadt 73: struct passwd *pw;
1.5 millert 74: int doall = 0;
75: time_t f_time = 0;
1.16 mickey 76: int bodun_always = 0;
1.1 deraadt 77:
1.5 millert 78: int f_dayAfter = 0; /* days after current date */
79: int f_dayBefore = 0; /* days before current date */
1.1 deraadt 80:
1.12 pjanzen 81: struct specialev spev[NUMEV];
82:
1.17 ! millert 83: void childsig(int);
1.15 pjanzen 84:
1.1 deraadt 85: int
86: main(argc, argv)
87: int argc;
88: char *argv[];
89: {
1.15 pjanzen 90: int ch;
1.1 deraadt 91: char *caldir;
92:
1.12 pjanzen 93: (void)setlocale(LC_ALL, "");
1.5 millert 94:
1.16 mickey 95: while ((ch = getopt(argc, argv, "-abf:t:A:B:")) != -1)
1.1 deraadt 96: switch (ch) {
97: case '-': /* backward contemptible */
98: case 'a':
1.5 millert 99: if (getuid())
1.13 millert 100: errx(1, "%s", strerror(EPERM));
1.1 deraadt 101: doall = 1;
102: break;
1.5 millert 103:
1.16 mickey 104: case 'b':
105: bodun_always++;
106: break;
107:
1.5 millert 108: case 'f': /* other calendar file */
109: calendarFile = optarg;
110: break;
111:
112: case 't': /* other date, undocumented, for tests */
1.12 pjanzen 113: if ((f_time = Mktime(optarg)) <= 0)
1.11 pjanzen 114: errx(1, "specified date is outside allowed range");
1.5 millert 115: break;
116:
117: case 'A': /* days after current date */
118: f_dayAfter = atoi(optarg);
119: break;
120:
121: case 'B': /* days before current date */
122: f_dayBefore = atoi(optarg);
123: break;
124:
1.1 deraadt 125: default:
126: usage();
127: }
128: argc -= optind;
129: argv += optind;
130:
131: if (argc)
132: usage();
133:
1.5 millert 134: /* use current time */
135: if (f_time <= 0)
136: (void)time(&f_time);
137:
1.12 pjanzen 138: if (f_dayBefore) {
139: /* Move back in time and only look forwards */
140: f_dayAfter += f_dayBefore;
141: f_time -= SECSPERDAY * f_dayBefore;
142: f_dayBefore = 0;
143: }
144: settime(&f_time);
1.5 millert 145:
1.10 millert 146: if (doall) {
1.15 pjanzen 147: pid_t kid, deadkid;
148: int kidstat, kidreaped, runningkids;
149: int acstat;
150: struct stat sbuf;
151: time_t t;
152: unsigned int sleeptime;
153:
154: signal(SIGCHLD, childsig);
155: runningkids = 0;
156: t = time(NULL);
1.1 deraadt 157: while ((pw = getpwent()) != NULL) {
1.15 pjanzen 158: acstat = 0;
159: /* Avoid unnecessary forks. The calendar file is only
160: * opened as the user later; if it can't be opened,
161: * it's no big deal. Also, get to correct directory.
162: * Note that in an NFS environment root may get EACCES
163: * on a chdir(), in which case we have to fork. As long as
164: * we can chdir() we can stat(), unless the user is
165: * modifying permissions while this is running.
166: */
167: if (chdir(pw->pw_dir)) {
168: if (errno == EACCES)
169: acstat = 1;
170: else
171: continue;
172: }
173: if (stat(calendarFile, &sbuf) != 0) {
174: if (chdir(calendarHome)) {
175: if (errno == EACCES)
176: acstat = 1;
177: else
178: continue;
179: }
180: if (stat(calendarNoMail, &sbuf) == 0 ||
181: stat(calendarFile, &sbuf) != 0)
182: continue;
183: }
184: sleeptime = USERTIMEOUT;
185: switch ((kid = fork())) {
186: case -1: /* error */
187: warn("fork");
188: continue;
189: case 0: /* child */
190: (void)setlocale(LC_ALL, "");
191: if (setusercontext(NULL, pw, pw->pw_uid,
192: LOGIN_SETALL ^ LOGIN_SETLOGIN))
193: err(1, "unable to set user context (uid %d)",
194: (int)pw->pw_uid);
195: if (acstat) {
196: if (chdir(pw->pw_dir) ||
197: stat(calendarFile, &sbuf) != 0 ||
198: chdir(calendarHome) ||
199: stat(calendarNoMail, &sbuf) == 0 ||
200: stat(calendarFile, &sbuf) != 0)
201: exit(0);
202: }
1.1 deraadt 203: cal();
1.15 pjanzen 204: exit(0);
205: }
206: /* parent: wait a reasonable time, then kill child if
207: * necessary.
208: */
209: runningkids++;
210: kidreaped = 0;
211: do {
212: sleeptime = sleep(sleeptime);
213: /* Note that there is the possibility, if the sleep
214: * stops early due to some other signal, of the child
215: * terminating and not getting detected during the next
216: * sleep. In that unlikely worst case, we just sleep
217: * too long for that user.
218: */
219: for (;;) {
220: deadkid = waitpid(-1, &kidstat, WNOHANG);
221: if (deadkid <= 0)
222: break;
223: runningkids--;
224: if (deadkid == kid) {
225: kidreaped = 1;
226: sleeptime = 0;
227: }
228: }
229: } while (sleeptime);
230:
231: if (!kidreaped) {
232: /* It doesn't _really_ matter if the kill fails, e.g.
233: * if there's only a zombie now.
234: */
235: (void)kill(kid, SIGTERM);
236: warnx("uid %d did not finish in time", (int)pw->pw_uid);
1.12 pjanzen 237: }
1.15 pjanzen 238: if (time(NULL) - t >= SECSPERDAY)
239: errx(2, "'calendar -a' took more than a day; stopped at uid %d",
240: (int)pw->pw_uid);
241: }
242: for (;;) {
243: deadkid = waitpid(-1, &kidstat, WNOHANG);
244: if (deadkid <= 0)
245: break;
246: runningkids--;
1.1 deraadt 247: }
1.15 pjanzen 248: if (runningkids)
249: warnx(
250: "%d child processes still running when 'calendar -a' finished", runningkids);
1.10 millert 251: }
1.1 deraadt 252: else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
1.5 millert 253: if(!chdir(caldir))
254: cal();
1.1 deraadt 255: } else
256: cal();
1.5 millert 257:
1.1 deraadt 258: exit(0);
259: }
260:
261:
262: void
263: usage()
264: {
1.5 millert 265: (void)fprintf(stderr,
1.16 mickey 266: "usage: calendar [-a] [-A num] [-b] [-B num] [-t [[[cc]yy][mm]]dd] "
1.14 aaron 267: "[-f calendarfile]\n");
1.1 deraadt 268: exit(1);
1.15 pjanzen 269: }
270:
271:
272: void
273: childsig(sig)
274: int sig;
275: {
1.1 deraadt 276: }
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