/*-
 * Copyright (C) 1996
 *      David L. Nugent.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
 *
 * $FreeBSD: src/usr.sbin/pw/cpdir.c,v 1.11 2012/02/14 10:17:03 kevlo Exp $
 */

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <dirent.h>

#include "pw.h"
#include "pwupd.h"

void
copymkdir(char const * dir, char const * skel, mode_t mode, uid_t uid, gid_t gid)
{
        char            src[MAXPATHLEN];
        char            dst[MAXPATHLEN];
        char            lnk[MAXPATHLEN];
        int             len;

        if (mkdir(dir, mode) != 0 && errno != EEXIST) {
                warn("mkdir(%s)", dir);
        } else {
                int             infd, outfd;
                struct stat     st;

                static char     counter = 0;
                static char    *copybuf = NULL;

                ++counter;
                chown(dir, uid, gid);
                if (skel != NULL && *skel != '\0') {
                        DIR            *d = opendir(skel);

                        if (d != NULL) {
                                struct dirent  *e;

                                while ((e = readdir(d)) != NULL) {
                                        char           *p = e->d_name;

                                        if (snprintf(src, sizeof(src), "%s/%s", skel, p) >= (int)sizeof(src))
                                                warn("warning: pathname too long '%s/%s' (skel not copied)", skel, p);
                                        else if (lstat(src, &st) == 0) {
                                                if (strncmp(p, "dot.", 4) == 0) /* Conversion */
                                                        p += 3;
                                                if (snprintf(dst, sizeof(dst), "%s/%s", dir, p) >= (int)sizeof(dst))
                                                        warn("warning: path too long '%s/%s' (skel file skipped)", dir, p);
                                                else {
                                                    if (S_ISDIR(st.st_mode)) {  /* Recurse for this */
                                                        if (strcmp(e->d_name, ".") != 0 && strcmp(e->d_name, "..") != 0) {
                                                                copymkdir(dst, src, st.st_mode & _DEF_DIRMODE, uid, gid);
                                                                chflags(dst, st.st_flags);      /* propagate flags */
                                                        }
                                                    } else if (S_ISLNK(st.st_mode) && (len = readlink(src, lnk, sizeof(lnk) - 1)) != -1) {
                                                        lnk[len] = '\0';
                                                        symlink(lnk, dst);
                                                        lchown(dst, uid, gid);
                                                        /*
                                                         * Note: don't propagate special attributes
                                                         * but do propagate file flags
                                                         */
                                                    } else if (S_ISREG(st.st_mode) && (outfd = open(dst, O_RDWR | O_CREAT | O_EXCL, st.st_mode)) != -1) {
                                                        if ((infd = open(src, O_RDONLY)) == -1) {
                                                                close(outfd);
                                                                remove(dst);
                                                        } else {
                                                                int             b;

                                                                /*
                                                                 * Allocate our copy buffer if we need to
                                                                 */
                                                                if (copybuf == NULL)
                                                                        copybuf = malloc(4096);
                                                                while ((b = read(infd, copybuf, 4096)) > 0)
                                                                        write(outfd, copybuf, b);
                                                                close(infd);
                                                                /*
                                                                 * Propagate special filesystem flags
                                                                 */
                                                                fchown(outfd, uid, gid);
                                                                fchflags(outfd, st.st_flags);
                                                                close(outfd);
                                                                chown(dst, uid, gid);
                                                        }
                                                    }
                                                }
                                        }
                                }
                                closedir(d);
                        }
                }
                if (--counter == 0 && copybuf != NULL) {
                        free(copybuf);
                        copybuf = NULL;
                }
        }
}