Annotation of src/usr.bin/calendar/calendar.c, Revision 1.25
1.25 ! deraadt 1: /* $OpenBSD: calendar.c,v 1.24 2005/08/09 12:32:58 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.
1.20 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: #ifndef lint
1.5 millert 33: static const char copyright[] =
1.1 deraadt 34: "@(#) Copyright (c) 1989, 1993\n\
35: The Regents of the University of California. All rights reserved.\n";
36: #endif /* not lint */
37:
38: #ifndef lint
39: #if 0
1.5 millert 40: static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
41: #else
1.25 ! deraadt 42: static const char rcsid[] = "$OpenBSD: calendar.c,v 1.24 2005/08/09 12:32:58 mickey Exp $";
1.1 deraadt 43: #endif
44: #endif /* not lint */
45:
1.15 pjanzen 46: #include <sys/stat.h>
47: #include <sys/types.h>
48: #include <sys/wait.h>
1.1 deraadt 49: #include <err.h>
50: #include <errno.h>
1.5 millert 51: #include <locale.h>
1.15 pjanzen 52: #include <login_cap.h>
1.1 deraadt 53: #include <pwd.h>
1.15 pjanzen 54: #include <signal.h>
1.1 deraadt 55: #include <stdio.h>
56: #include <stdlib.h>
57: #include <string.h>
1.5 millert 58: #include <time.h>
1.12 pjanzen 59: #include <tzfile.h>
1.1 deraadt 60: #include <unistd.h>
61:
62: #include "pathnames.h"
1.5 millert 63: #include "calendar.h"
1.1 deraadt 64:
1.15 pjanzen 65: char *calendarFile = "calendar"; /* default calendar file */
66: char *calendarHome = ".calendar"; /* HOME */
67: char *calendarNoMail = "nomail"; /* don't sent mail if this file exists */
68:
1.1 deraadt 69: struct passwd *pw;
1.5 millert 70: int doall = 0;
71: time_t f_time = 0;
1.16 mickey 72: int bodun_always = 0;
1.1 deraadt 73:
1.5 millert 74: int f_dayAfter = 0; /* days after current date */
75: int f_dayBefore = 0; /* days before current date */
1.24 mickey 76: int f_SetdayAfter = 0; /* calendar invoked with -A */
1.1 deraadt 77:
1.12 pjanzen 78: struct specialev spev[NUMEV];
79:
1.17 millert 80: void childsig(int);
1.15 pjanzen 81:
1.1 deraadt 82: int
1.21 deraadt 83: main(int argc, char *argv[])
1.1 deraadt 84: {
1.15 pjanzen 85: int ch;
1.1 deraadt 86: char *caldir;
87:
1.12 pjanzen 88: (void)setlocale(LC_ALL, "");
1.5 millert 89:
1.19 millert 90: while ((ch = getopt(argc, argv, "abf:t:A:B:-")) != -1)
1.1 deraadt 91: switch (ch) {
92: case '-': /* backward contemptible */
93: case 'a':
1.5 millert 94: if (getuid())
1.13 millert 95: errx(1, "%s", strerror(EPERM));
1.1 deraadt 96: doall = 1;
97: break;
1.5 millert 98:
1.16 mickey 99: case 'b':
100: bodun_always++;
101: break;
102:
1.5 millert 103: case 'f': /* other calendar file */
104: calendarFile = optarg;
105: break;
106:
107: case 't': /* other date, undocumented, for tests */
1.12 pjanzen 108: if ((f_time = Mktime(optarg)) <= 0)
1.11 pjanzen 109: errx(1, "specified date is outside allowed range");
1.5 millert 110: break;
111:
112: case 'A': /* days after current date */
113: f_dayAfter = atoi(optarg);
1.24 mickey 114: f_SetdayAfter = 1;
1.5 millert 115: break;
116:
117: case 'B': /* days before current date */
118: f_dayBefore = atoi(optarg);
119: break;
120:
1.1 deraadt 121: default:
122: usage();
123: }
124: argc -= optind;
125: argv += optind;
126:
127: if (argc)
128: usage();
129:
1.5 millert 130: /* use current time */
131: if (f_time <= 0)
132: (void)time(&f_time);
133:
1.12 pjanzen 134: if (f_dayBefore) {
135: /* Move back in time and only look forwards */
136: f_dayAfter += f_dayBefore;
137: f_time -= SECSPERDAY * f_dayBefore;
138: f_dayBefore = 0;
139: }
140: settime(&f_time);
1.5 millert 141:
1.10 millert 142: if (doall) {
1.15 pjanzen 143: pid_t kid, deadkid;
144: int kidstat, kidreaped, runningkids;
145: int acstat;
146: struct stat sbuf;
147: time_t t;
148: unsigned int sleeptime;
149:
150: signal(SIGCHLD, childsig);
151: runningkids = 0;
152: t = time(NULL);
1.1 deraadt 153: while ((pw = getpwent()) != NULL) {
1.15 pjanzen 154: acstat = 0;
155: /* Avoid unnecessary forks. The calendar file is only
156: * opened as the user later; if it can't be opened,
157: * it's no big deal. Also, get to correct directory.
158: * Note that in an NFS environment root may get EACCES
159: * on a chdir(), in which case we have to fork. As long as
160: * we can chdir() we can stat(), unless the user is
161: * modifying permissions while this is running.
162: */
163: if (chdir(pw->pw_dir)) {
164: if (errno == EACCES)
165: acstat = 1;
166: else
167: continue;
168: }
169: if (stat(calendarFile, &sbuf) != 0) {
170: if (chdir(calendarHome)) {
171: if (errno == EACCES)
172: acstat = 1;
173: else
174: continue;
175: }
176: if (stat(calendarNoMail, &sbuf) == 0 ||
177: stat(calendarFile, &sbuf) != 0)
178: continue;
179: }
180: sleeptime = USERTIMEOUT;
181: switch ((kid = fork())) {
182: case -1: /* error */
183: warn("fork");
184: continue;
185: case 0: /* child */
186: (void)setlocale(LC_ALL, "");
187: if (setusercontext(NULL, pw, pw->pw_uid,
188: LOGIN_SETALL ^ LOGIN_SETLOGIN))
1.18 deraadt 189: err(1, "unable to set user context (uid %u)",
190: pw->pw_uid);
1.15 pjanzen 191: if (acstat) {
192: if (chdir(pw->pw_dir) ||
193: stat(calendarFile, &sbuf) != 0 ||
194: chdir(calendarHome) ||
195: stat(calendarNoMail, &sbuf) == 0 ||
196: stat(calendarFile, &sbuf) != 0)
197: exit(0);
198: }
1.1 deraadt 199: cal();
1.15 pjanzen 200: exit(0);
201: }
202: /* parent: wait a reasonable time, then kill child if
203: * necessary.
204: */
205: runningkids++;
206: kidreaped = 0;
207: do {
208: sleeptime = sleep(sleeptime);
209: /* Note that there is the possibility, if the sleep
210: * stops early due to some other signal, of the child
211: * terminating and not getting detected during the next
212: * sleep. In that unlikely worst case, we just sleep
213: * too long for that user.
214: */
215: for (;;) {
216: deadkid = waitpid(-1, &kidstat, WNOHANG);
217: if (deadkid <= 0)
218: break;
219: runningkids--;
220: if (deadkid == kid) {
221: kidreaped = 1;
222: sleeptime = 0;
223: }
224: }
225: } while (sleeptime);
226:
227: if (!kidreaped) {
228: /* It doesn't _really_ matter if the kill fails, e.g.
229: * if there's only a zombie now.
230: */
231: (void)kill(kid, SIGTERM);
1.18 deraadt 232: warnx("uid %u did not finish in time", pw->pw_uid);
1.12 pjanzen 233: }
1.15 pjanzen 234: if (time(NULL) - t >= SECSPERDAY)
1.25 ! deraadt 235: errx(2, "'calendar -a' took more than a day; "
! 236: "stopped at uid %u",
1.18 deraadt 237: pw->pw_uid);
1.15 pjanzen 238: }
239: for (;;) {
240: deadkid = waitpid(-1, &kidstat, WNOHANG);
241: if (deadkid <= 0)
242: break;
243: runningkids--;
1.1 deraadt 244: }
1.15 pjanzen 245: if (runningkids)
1.25 ! deraadt 246: warnx("%d child processes still running when "
! 247: "'calendar -a' finished", runningkids);
! 248: } else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
1.5 millert 249: if(!chdir(caldir))
250: cal();
1.1 deraadt 251: } else
252: cal();
1.5 millert 253:
1.1 deraadt 254: exit(0);
255: }
256:
257:
258: void
1.21 deraadt 259: usage(void)
1.1 deraadt 260: {
1.5 millert 261: (void)fprintf(stderr,
1.22 jmc 262: "usage: calendar [-ab] [-A num] [-B num] [-f calendarfile] "
263: "[-t [[[cc]yy][mm]]dd]\n");
1.1 deraadt 264: exit(1);
1.15 pjanzen 265: }
266:
267:
268: void
1.21 deraadt 269: childsig(int signo)
1.15 pjanzen 270: {
1.1 deraadt 271: }
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