/* $NetBSD: dir.c,v 1.2.2.2 2024/02/25 15:47:15 martin Exp $ */ /* * 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 #include #include #include #include #include #include #include #include #include #include #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 */ } isc_result_t isc_dir_createunique(char *templet) { isc_result_t result; char *x; char *p; int i; int pid; REQUIRE(templet != NULL); /*! * \brief mkdtemp is not portable, so this emulates it. */ pid = getpid(); /* * Replace trailing Xs with the process-id, zero-filled. */ for (x = templet + strlen(templet) - 1; *x == 'X' && x >= templet; x--, pid /= 10) { *x = pid % 10 + '0'; } x++; /* Set x to start of ex-Xs. */ do { i = mkdir(templet, 0700); if (i == 0 || errno != EEXIST) { break; } /* * The BSD algorithm. */ p = x; while (*p != '\0') { if (isdigit((unsigned char)*p)) { *p = 'a'; } else if (*p != 'z') { ++*p; } else { /* * Reset character and move to next. */ *p++ = 'a'; continue; } break; } if (*p == '\0') { /* * Tried all combinations. errno should already * be EEXIST, but ensure it is anyway for * isc__errno2result(). */ errno = EEXIST; break; } } while (1); if (i == -1) { result = isc__errno2result(errno); } else { result = ISC_R_SUCCESS; } return (result); }