/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*
 * chown [-fR] uid[.gid] file ...
 */

#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <dirent.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>

struct  passwd *pwd;
struct  passwd *getpwnam();
struct  stat stbuf;
uid_t   uid;
int     status;
int     fflag;
int     rflag;

void fatal(int, char *, char *);

int
main(int argc, char *argv[])
{
        int c;
        gid_t gid;
        char *cp, *group;
        char optchar[2];
        struct group *grp;
        extern char *strchr();

        argc--, argv++;
        while (argc > 0 && argv[0][0] == '-') {
                for (cp = &argv[0][1]; *cp; cp++)

                switch (*cp) {

                case 'f':
                        fflag++;
                        break;

                case 'R':
                        rflag++;
                        break;

                default:
                        optchar[0] = *cp;
                        optchar[1] = '\0';
                        fatal(255, "unknown option: %s", optchar);
                }
                argv++, argc--;
        }
        if (argc < 2) {
                fprintf(stderr, "usage: chown [-fR] owner[.group] file ...\n");
                exit(-1);
        }
        gid = -1;
        group = strchr(argv[0], '.');
        if (group != NULL) {
                *group++ = '\0';
                if (!isnumber(group)) {
                        if ((grp = getgrnam(group)) == NULL)
                                fatal(255, "unknown group: %s", group);
                        gid = grp -> gr_gid;
                        (void) endgrent();
                } else if (*group != '\0') {
                        errno = 0;
                        gid = (gid_t)strtol(group, NULL, 10);
                        if (errno != 0) {
                                if (errno == ERANGE) {
                                        fatal(2,
                                            "group id too large: %s", group);
                                } else {
                                        fatal(2, "group id invalid: %s", group);
                                }
                        }
                }
        }
        if (!isnumber(argv[0])) {
                if ((pwd = getpwnam(argv[0])) == NULL)
                        fatal(255, "unknown user id: %s", argv[0]);
                uid = pwd->pw_uid;
        } else {
                errno = 0;
                uid = (uid_t)strtol(argv[0], NULL, 10);
                if (errno != 0) {
                        if (errno == ERANGE) {
                                fatal(2, "user id too large: %s", argv[0]);
                        } else {
                                fatal(2, "user id invalid: %s", argv[0]);
                        }
                }
        }
        for (c = 1; c < argc; c++) {
                /* do stat for directory arguments */
                if (lstat(argv[c], &stbuf) < 0) {
                        status += Perror(argv[c]);
                        continue;
                }
                if (rflag && ((stbuf.st_mode&S_IFMT) == S_IFDIR)) {
                        status += chownr(argv[c], uid, gid);
                        continue;
                }
                if (lchown(argv[c], uid, gid)) {
                        status += Perror(argv[c]);
                        continue;
                }
        }
        return (status);
}

int
isnumber(char *s)
{
        int c;

        while (c = *s++)
                if (!isdigit(c))
                        return (0);
        return (1);
}

int
chownr(char *dir, uid_t uid, gid_t gid)
{
        DIR *dirp;
        struct dirent *dp;
        struct stat st;
        char savedir[1024];
        int ecode;

        if (getcwd(savedir, 1024) == NULL)
                fatal(255, "%s", savedir);
        /*
         * Change what we are given before doing it's contents.
         */
        if (chown(dir, uid, gid) < 0 && Perror(dir))
                return (1);
        if (chdir(dir) < 0) {
                Perror(dir);
                return (1);
        }
        if ((dirp = opendir(".")) == NULL) {
                Perror(dir);
                return (1);
        }
        dp = readdir(dirp);
        dp = readdir(dirp); /* read "." and ".." */
        ecode = 0;
        for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
                if (lstat(dp->d_name, &st) < 0) {
                        ecode = Perror(dp->d_name);
                        if (ecode)
                                break;
                        continue;
                }
                if ((st.st_mode&S_IFMT) == S_IFDIR) {
                        ecode = chownr(dp->d_name, uid, gid);
                        if (ecode)
                                break;
                        continue;
                }
                if (lchown(dp->d_name, uid, gid) < 0 &&
                    (ecode = Perror(dp->d_name)))
                        break;
        }
        closedir(dirp);
        if (chdir(savedir) < 0)
                fatal(255, "can't change back to %s", savedir);
        return (ecode);
}

int
error(char *fmt, char *a)
{

        if (!fflag) {
                fprintf(stderr, "chown: ");
                fprintf(stderr, fmt, a);
                putc('\n', stderr);
        }
        return (!fflag);
}

void
fatal(int status, char *fmt, char *a)
{

        fflag = 0;
        (void) error(fmt, a);
        exit(status);
}

int
Perror(char *s)
{

        if (!fflag) {
                fprintf(stderr, "chown: ");
                perror(s);
        }
        return (!fflag);
}