usr/src/usr.bin/chpass/pw_copy.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)pw_copy.c   5.3 (Berkeley) 5/2/91";
#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);
}