1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1988, 1993
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. Neither the name of the University nor the names of its contributors
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 #include <ctype.h>
33 #include <err.h>
34 #include <locale.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <time.h>
38 #include <unistd.h>
39
40 #include <capsicum_helpers.h>
41
42 static void doalarm(u_int);
43 static void usage(void) __dead2;
44
45 /*
46 * leave [[+]hhmm]
47 *
48 * Reminds you when you have to leave.
49 * Leave prompts for input and goes away if you hit return.
50 * It nags you like a mother hen.
51 */
52 int
main(int argc,char ** argv)53 main(int argc, char **argv)
54 {
55 u_int secs;
56 int hours, minutes;
57 char c, *cp = NULL;
58 struct tm *t;
59 time_t now;
60 int plusnow, t_12_hour;
61 char buf[50];
62
63 if (setlocale(LC_TIME, "") == NULL)
64 warn("setlocale");
65
66 caph_cache_tzdata();
67 caph_cache_catpages();
68 if (caph_limit_stdio() < 0 || caph_enter() < 0)
69 err(EXIT_FAILURE, "capsicum");
70
71 if (argc < 2) {
72 #define MSG1 "When do you have to leave? "
73 (void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
74 cp = fgets(buf, sizeof(buf), stdin);
75 if (cp == NULL || *cp == '\n')
76 exit(EXIT_SUCCESS);
77 } else if (argc > 2)
78 usage();
79 else
80 cp = argv[1];
81
82 if (*cp == '+') {
83 plusnow = 1;
84 ++cp;
85 } else
86 plusnow = 0;
87
88 for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
89 if (!isdigit(c))
90 usage();
91 hours = hours * 10 + (c - '0');
92 }
93 minutes = hours % 100;
94 hours /= 100;
95
96 if (minutes < 0 || minutes > 59)
97 usage();
98 if (plusnow)
99 secs = hours * 60 * 60 + minutes * 60;
100 else {
101 (void)time(&now);
102 t = localtime(&now);
103
104 if (hours > 23)
105 usage();
106
107 /* Convert tol to 12 hr time (0:00...11:59) */
108 if (hours > 11)
109 hours -= 12;
110
111 /* Convert tm to 12 hr time (0:00...11:59) */
112 if (t->tm_hour > 11)
113 t_12_hour = t->tm_hour - 12;
114 else
115 t_12_hour = t->tm_hour;
116
117 if (hours < t_12_hour ||
118 (hours == t_12_hour && minutes <= t->tm_min))
119 /* Leave time is in the past so we add 12 hrs */
120 hours += 12;
121
122 secs = (hours - t_12_hour) * 60 * 60;
123 secs += (minutes - t->tm_min) * 60;
124 secs -= now % 60; /* truncate (now + secs) to min */
125 }
126 doalarm(secs);
127 exit(EXIT_SUCCESS);
128 }
129
130 void
doalarm(u_int secs)131 doalarm(u_int secs)
132 {
133 int bother;
134 time_t daytime;
135 char tb[80];
136 int pid;
137
138 if ((pid = fork())) {
139 (void)time(&daytime);
140 daytime += secs;
141 strftime(tb, sizeof(tb), "%+", localtime(&daytime));
142 printf("Alarm set for %s. (pid %d)\n", tb, pid);
143 exit(EXIT_SUCCESS);
144 }
145 sleep((u_int)2); /* let parent print set message */
146 if (secs >= 2)
147 secs -= 2;
148
149 /*
150 * if write fails, we've lost the terminal through someone else
151 * causing a vhangup by logging in.
152 */
153 #define FIVEMIN (5 * 60)
154 #define MSG2 "\07\07You have to leave in 5 minutes.\n"
155 if (secs >= FIVEMIN) {
156 sleep(secs - FIVEMIN);
157 if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
158 exit(EXIT_SUCCESS);
159 secs = FIVEMIN;
160 }
161
162 #define ONEMIN (60)
163 #define MSG3 "\07\07Just one more minute!\n"
164 if (secs >= ONEMIN) {
165 sleep(secs - ONEMIN);
166 if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
167 exit(EXIT_SUCCESS);
168 }
169
170 #define MSG4 "\07\07Time to leave!\n"
171 for (bother = 10; bother--;) {
172 sleep((u_int)ONEMIN);
173 if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
174 exit(EXIT_SUCCESS);
175 }
176
177 #define MSG5 "\07\07That was the last time I'll tell you. Bye.\n"
178 (void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
179 exit(EXIT_SUCCESS);
180 }
181
182 static void
usage(void)183 usage(void)
184 {
185 fprintf(stderr, "usage: leave [[+]hhmm]\n");
186 exit(EXIT_FAILURE);
187 }
188