don't let users create their own symbol table for the running kernel

[unix-history] / usr / src / usr.bin / chpass / pw_copy.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)pw_copy.c   5.3 (Berkeley) %G%";
#endif /* not lint */

/*
* This module is used to copy the master password file, replacing a single
* record, by chpass(1) and passwd(1).
*/

#include <pwd.h>
#include <stdio.h>
#include <string.h>

extern char *progname, *tempname;

pw_copy(ffd, tfd, pw)
       int ffd, tfd;
       struct passwd *pw;
{
       register FILE *from, *to;
       register int done;
       register char *p;
       char buf[8192];

       if (!(from = fdopen(ffd, "r")))
               pw_error(_PATH_MASTERPASSWD, 1, 1);
       if (!(to = fdopen(tfd, "w")))
               pw_error(tempname, 1, 1);

       for (done = 0; fgets(buf, sizeof(buf), from);) {
               if (!index(buf, '\n')) {
                       (void)fprintf(stderr, "%s: %s: line too long\n",
                           progname, _PATH_MASTERPASSWD);
                       pw_error(NULL, 0, 1);
               }
               if (done) {
                       (void)fprintf(to, "%s", buf);
                       if (ferror(to))
                               goto err;
                       continue;
               }
               if (!(p = index(buf, ':'))) {
                       (void)fprintf(stderr, "%s: %s: corrupted entry\n",
                           progname, _PATH_MASTERPASSWD);
                       pw_error(NULL, 0, 1);
               }
               *p = '\0';
               if (strcmp(buf, pw->pw_name)) {
                       *p = ':';
                       (void)fprintf(to, "%s", buf);
                       if (ferror(to))
                               goto err;
                       continue;
               }
               (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
                   pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
                   pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos,
                   pw->pw_dir, pw->pw_shell);
               done = 1;
               if (ferror(to))
                       goto err;
       }
       if (!done)
               (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
                   pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
                   pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos,
                   pw->pw_dir, pw->pw_shell);

       if (ferror(to))
err:            pw_error(NULL, 1, 1);
       (void)fclose(to);
}