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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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volume38
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shadow
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part12
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pwunconv.c
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C/C++ Source or Header
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1993-08-14
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/*
* Copyright 1989, 1990, 1991, John F. Haugh II
* All rights reserved.
*
* Permission is granted to copy and create derivative works for any
* non-commercial purpose, provided this copyright notice is preserved
* in all copies of source code, or included in human readable form
* and conspicuously displayed on all copies of object code or
* distribution media.
*
* pwunconv - restore old password file from shadow password file.
*
* Pwunconv copies the password file information from the shadow
* password file, merging entries from an optional existing shadow
* file.
*
* The new password file is left in npasswd. There is no new
* shadow file. Password aging information is translated where
* possible.
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include "pwd.h"
#include "shadow.h"
#ifndef lint
static char sccsid[] = "@(#)pwunconv.c 3.4 11:59:24 28 Dec 1991";
#endif
#ifdef ITI_AGING
#define WEEK (7L*24L*3600L)
#else
#define WEEK (7)
#endif
char buf[BUFSIZ];
char *l64a ();
int main ()
{
struct passwd *pw;
struct passwd *sgetpwent ();
FILE *pwd;
FILE *npwd;
struct spwd *spwd;
int fd;
char newage[5];
if (! (pwd = fopen (PWDFILE, "r"))) {
perror (PWDFILE);
return (1);
}
unlink ("npasswd");
if ((fd = open ("npasswd", O_WRONLY|O_CREAT|O_EXCL, 0600)) < 0 ||
! (npwd = fdopen (fd, "w"))) {
perror ("npasswd");
return (1);
}
while (fgets (buf, BUFSIZ, pwd) == buf) {
buf[strlen (buf) - 1] = '\0'; /* remove '\n' character */
if (buf[0] == '#') { /* comment line */
(void) fprintf (npwd, "%s\n", buf);
continue;
}
if (! (pw = sgetpwent (buf))) { /* copy bad lines verbatim */
(void) fprintf (npwd, "%s\n", buf);
continue;
}
setspent (); /* rewind shadow file */
if (! (spwd = getspnam (pw->pw_name))) {
(void) fprintf (npwd, "%s\n", buf);
continue;
}
pw->pw_passwd = spwd->sp_pwdp;
/*
* Password aging works differently in the two different systems.
* With shadow password files you apparently must have some aging
* information. The maxweeks or minweeks may not map exactly.
* In pwconv we set max == 10000, which is about 30 years. Here
* we have to undo that kludge. So, if maxdays == 10000, no aging
* information is put into the new file. Otherwise, the days are
* converted to weeks and so on.
*/
#ifdef ATT_AGE
if (spwd->sp_max > (63*WEEK) && spwd->sp_max < 10000)
spwd->sp_max = (63*WEEK); /* 10000 is infinity */
if (spwd->sp_min >= 0 && spwd->sp_min <= 63*7 &&
spwd->sp_max >= 0 && spwd->sp_max <= 63*7) {
if (spwd->sp_lstchg == -1)
spwd->sp_lstchg = 0;
spwd->sp_max /= WEEK; /* turn it into weeks */
spwd->sp_min /= WEEK;
spwd->sp_lstchg /= WEEK;
strncpy (newage, l64a (spwd->sp_lstchg * (64L*64L) +
spwd->sp_min * (64L) + spwd->sp_max), 5);
pw->pw_age = newage;
} else
pw->pw_age = "";
#endif /* ATT_AGE */
if (putpwent (pw, npwd)) {
perror ("pwunconv: write error");
exit (1);
}
}
endspent ();
if (ferror (npwd)) {
perror ("pwunconv");
(void) unlink ("npasswd");
}
(void) fclose (npwd);
(void) fclose (pwd);
return (0);
}