1 /* 2 * Copyright (c) 1980, 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)lock.c 5.13 (Berkeley) 06/01/90"; 16 #endif /* not lint */ 17 18 /* 19 * Lock a terminal up until the given key is entered, until the root 20 * password is entered, or the given interval times out. 21 * 22 * Timeout interval is by default TIMEOUT, it can be changed with 23 * an argument of the form -time where time is in minutes 24 */ 25 26 #include <sys/param.h> 27 #include <sys/stat.h> 28 #include <sys/time.h> 29 #include <sys/signal.h> 30 #include <sgtty.h> 31 #include <pwd.h> 32 #include <stdio.h> 33 #include <ctype.h> 34 #include <string.h> 35 36 #define TIMEOUT 15 37 38 void quit(), bye(), hi(); 39 40 struct timeval timeout; 41 struct timeval zerotime; 42 struct sgttyb tty, ntty; 43 long nexttime; /* keep the timeout time */ 44 45 /*ARGSUSED*/ 46 main(argc, argv) 47 int argc; 48 char **argv; 49 { 50 extern char *optarg; 51 extern int errno, optind; 52 struct passwd *pw; 53 struct timeval timval; 54 struct itimerval ntimer, otimer; 55 struct tm *timp; 56 int ch, sectimeout, usemine; 57 char *ap, *mypw, *ttynam, *tzn; 58 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 59 char *crypt(), *ttyname(); 60 61 sectimeout = TIMEOUT; 62 mypw = NULL; 63 usemine = 0; 64 while ((ch = getopt(argc, argv, "pt:")) != EOF) 65 switch((char)ch) { 66 case 't': 67 if ((sectimeout = atoi(optarg)) <= 0) { 68 (void)fprintf(stderr, 69 "lock: illegal timeout value.\n"); 70 exit(1); 71 } 72 break; 73 case 'p': 74 usemine = 1; 75 if (!(pw = getpwuid(getuid()))) { 76 (void)fprintf(stderr, 77 "lock: unknown uid %d.\n", getuid()); 78 exit(1); 79 } 80 mypw = strdup(pw->pw_passwd); 81 break; 82 case '?': 83 default: 84 (void)fprintf(stderr, 85 "usage: lock [-p] [-t timeout]\n"); 86 exit(1); 87 } 88 timeout.tv_sec = sectimeout * 60; 89 90 setuid(getuid()); /* discard privs */ 91 92 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 93 exit(1); 94 gethostname(hostname, sizeof(hostname)); 95 if (!(ttynam = ttyname(0))) { 96 (void)printf("lock: not a terminal?\n"); 97 exit(1); 98 } 99 if (gettimeofday(&timval, (struct timezone *)NULL)) { 100 (void)fprintf(stderr, 101 "lock: gettimeofday: %s\n", strerror(errno)); 102 exit(1); 103 } 104 nexttime = timval.tv_sec + (sectimeout * 60); 105 timp = localtime(&timval.tv_sec); 106 ap = asctime(timp); 107 tzn = timp->tm_zone; 108 109 (void)signal(SIGINT, quit); 110 (void)signal(SIGQUIT, quit); 111 ntty = tty; ntty.sg_flags &= ~ECHO; 112 (void)ioctl(0, TIOCSETP, &ntty); 113 114 if (!mypw) { 115 /* get key and check again */ 116 (void)printf("Key: "); 117 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 118 quit(); 119 (void)printf("\nAgain: "); 120 /* 121 * Don't need EOF test here, if we get EOF, then s1 != s 122 * and the right things will happen. 123 */ 124 (void)fgets(s1, sizeof(s1), stdin); 125 (void)putchar('\n'); 126 if (strcmp(s1, s)) { 127 (void)printf("\07lock: passwords didn't match.\n"); 128 ioctl(0, TIOCSETP, &tty); 129 exit(1); 130 } 131 s[0] = NULL; 132 mypw = s1; 133 } 134 135 /* set signal handlers */ 136 (void)signal(SIGINT, hi); 137 (void)signal(SIGQUIT, hi); 138 (void)signal(SIGTSTP, hi); 139 (void)signal(SIGALRM, bye); 140 141 ntimer.it_interval = zerotime; 142 ntimer.it_value = timeout; 143 setitimer(ITIMER_REAL, &ntimer, &otimer); 144 145 /* header info */ 146 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 147 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 148 149 for (;;) { 150 (void)printf("Key: "); 151 if (!fgets(s, sizeof(s), stdin)) { 152 clearerr(stdin); 153 hi(); 154 continue; 155 } 156 if (usemine) { 157 s[strlen(s) - 1] = '\0'; 158 if (!strcmp(mypw, crypt(s, mypw))) 159 break; 160 } 161 else if (!strcmp(s, s1)) 162 break; 163 (void)printf("\07\n"); 164 if (ioctl(0, TIOCGETP, &ntty)) 165 exit(1); 166 } 167 quit(); 168 } 169 170 void 171 hi() 172 { 173 struct timeval timval; 174 175 if (!gettimeofday(&timval, (struct timezone *)NULL)) 176 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 177 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 178 } 179 180 void 181 quit() 182 { 183 (void)putchar('\n'); 184 (void)ioctl(0, TIOCSETP, &tty); 185 exit(0); 186 } 187 188 void 189 bye() 190 { 191 (void)ioctl(0, TIOCSETP, &tty); 192 (void)printf("lock: timeout\n"); 193 exit(1); 194 } 195