This is pw_check.c in view mode; [Download] [Up]
/*
* Copyright 1993 NeXT Computer Inc. All rights reserved.
* Written by Marc Majka
* You may freely copy, distribute and reuse the code in this example.
* NeXT disclaims any warranty of any kind, expressed or implied, as to
* its fitness for any particular use.
*/
#import <stdio.h>
#import <pwd.h>
#import <signal.h>
#import <sys/reboot.h>
#define MAXATTEMPTS 3
main(argc, argv)
int argc;
char *argv[];
{
char *crypt(), *getpass(), salt[3], key[9], target[16];
struct passwd *pw;
int trying, attempt;
/* ignore signals */
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGTSTP, SIG_IGN);
if (argc < 2) { /* no command line option */
pw = getpwuid(0); /* lookup root */
if (pw == NULL) exit(0); /* root doesn't exist! */
}
else {
pw = getpwnam(argv[1]); /* lookup given user name */
if (pw == NULL) { /* user doesn't exist */
pw = getpwuid(0); /* lookup root instead */
if (pw == NULL) exit(0); /* root doesn't exist! */
}
}
strcpy(target,pw->pw_passwd); /* target password */
salt[0] = target[0]; /* the "salt" */
salt[1] = target[1];
salt[2] = '\0';
trying = 1;
for (attempt = 0; attempt < MAXATTEMPTS && trying; attempt++) {
strcpy(key, getpass("Password: "));
if (key[0] != 0 && !strcmp(target, crypt(key, salt)))
trying = 0;
}
if (trying) reboot(RB_HALT); /* user was still trying - halt */
exit(0); /* user entered the correct password */
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.