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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <isc/dir.h>
#include <isc/magic.h>
#include <isc/string.h>
#include <isc/util.h>
#include "errno2result.h"
#define ISC_DIR_MAGIC ISC_MAGIC('D', 'I', 'R', '*')
#define VALID_DIR(dir) ISC_MAGIC_VALID(dir, ISC_DIR_MAGIC)
void
isc_dir_init(isc_dir_t *dir) {
REQUIRE(dir != NULL);
dir->entry.name[0] = '\0';
dir->entry.length = 0;
dir->handle = NULL;
dir->magic = ISC_DIR_MAGIC;
}
/*!
* \brief Allocate workspace and open directory stream. If either one fails,
* NULL will be returned.
*/
isc_result_t
isc_dir_open(isc_dir_t *dir, const char *dirname) {
char *p;
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(VALID_DIR(dir));
REQUIRE(dirname != NULL);
/*
* Copy directory name. Need to have enough space for the name,
* a possible path separator, the wildcard, and the final NUL.
*/
if (strlen(dirname) + 3 > sizeof(dir->dirname)) {
/* XXXDCL ? */
return ISC_R_NOSPACE;
}
strlcpy(dir->dirname, dirname, sizeof(dir->dirname));
/*
* Append path separator, if needed, and "*".
*/
p = dir->dirname + strlen(dir->dirname);
if (dir->dirname < p && *(p - 1) != '/') {
*p++ = '/';
}
*p++ = '*';
*p = '\0';
/*
* Open stream.
*/
dir->handle = opendir(dirname);
if (dir->handle == NULL) {
return isc__errno2result(errno);
}
return result;
}
/*!
* \brief Return previously retrieved file or get next one.
*
* Unix's dirent has
* separate open and read functions, but the Win32 and DOS interfaces open
* the dir stream and reads the first file in one operation.
*/
isc_result_t
isc_dir_read(isc_dir_t *dir) {
struct dirent *entry;
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
/*
* Fetch next file in directory.
*/
entry = readdir(dir->handle);
if (entry == NULL) {
return ISC_R_NOMORE;
}
/*
* Make sure that the space for the name is long enough.
*/
if (sizeof(dir->entry.name) <= strlen(entry->d_name)) {
return ISC_R_UNEXPECTED;
}
strlcpy(dir->entry.name, entry->d_name, sizeof(dir->entry.name));
/*
* Some dirents have d_namlen, but it is not portable.
*/
dir->entry.length = strlen(entry->d_name);
return ISC_R_SUCCESS;
}
/*!
* \brief Close directory stream.
*/
void
isc_dir_close(isc_dir_t *dir) {
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
(void)closedir(dir->handle);
dir->handle = NULL;
}
/*!
* \brief Reposition directory stream at start.
*/
isc_result_t
isc_dir_reset(isc_dir_t *dir) {
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
rewinddir(dir->handle);
return ISC_R_SUCCESS;
}
isc_result_t
isc_dir_chdir(const char *dirname) {
/*!
* \brief Change the current directory to 'dirname'.
*/
REQUIRE(dirname != NULL);
if (chdir(dirname) < 0) {
return isc__errno2result(errno);
}
return ISC_R_SUCCESS;
}
isc_result_t
isc_dir_chroot(const char *dirname) {
#ifdef HAVE_CHROOT
void *tmp;
#endif /* ifdef HAVE_CHROOT */
REQUIRE(dirname != NULL);
#ifdef HAVE_CHROOT
/*
* Try to use getservbyname and getprotobyname before chroot.
* If WKS records are used in a zone under chroot, Name Service Switch
* may fail to load library in chroot.
* Do not report errors if it fails, we do not need any result now.
*/
tmp = getprotobyname("udp");
if (tmp != NULL) {
(void)getservbyname("domain", "udp");
}
if (chroot(dirname) < 0 || chdir("/") < 0) {
return isc__errno2result(errno);
}
return ISC_R_SUCCESS;
#else /* ifdef HAVE_CHROOT */
return ISC_R_NOTIMPLEMENTED;
#endif /* ifdef HAVE_CHROOT */
}
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