author | Jon Tibble <meths@btinternet.com> |
Thu, 09 Dec 2010 22:32:39 +0100 | |
changeset 13255 | 4afa820d78b9 |
parent 13105 | 48f2dbca79a2 |
permissions | -rw-r--r-- |
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/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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*/ |
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/* |
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Roger A. Faulkner <Roger.Faulkner@Oracle.COM>
parents:
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* Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved. |
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*/ |
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/* Copyright (c) 1988 AT&T */ |
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/* All Rights Reserved */ |
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#include "lint.h" |
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#include <sys/types.h> |
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#include <dirent.h> |
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#include <sys/param.h> |
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#include <limits.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <string.h> |
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/* |
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* Canonicalize the path given in file_name, resolving away all symbolic link |
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* components. Store the result into the buffer named by resolved_name, which |
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Roger A. Faulkner <Roger.Faulkner@Oracle.COM>
parents:
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* must be long enough (PATH_MAX bytes will suffice). Returns NULL |
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* on failure and resolved_name on success. On failure, to maintain |
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* compatibility with the past, the contents of file_name will be copied |
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* into resolved_name. |
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*/ |
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parents:
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static char * |
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realpath_impl(const char *file_name, char *resolved_name) |
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{ |
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char cwd[PATH_MAX]; |
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int len; |
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if (file_name == NULL) { |
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errno = EINVAL; |
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return (NULL); |
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} |
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/* |
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* Call resolvepath() to resolve all the symlinks in file_name, |
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* eliminate embedded "." components, and collapse embedded ".." |
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* components. We may be left with leading ".." components. |
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*/ |
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if ((len = resolvepath(file_name, resolved_name, PATH_MAX)) < 0) { |
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(void) strlcpy(resolved_name, file_name, PATH_MAX); |
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return (NULL); /* errno set by resolvepath() */ |
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} |
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if (len >= PATH_MAX) /* "can't happen" */ |
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len = PATH_MAX - 1; |
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resolved_name[len] = '\0'; |
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if (*resolved_name == '/') /* nothing more to do */ |
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return (resolved_name); |
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/* |
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* Prepend the current working directory to the relative path. |
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* If the relative path is not empty (or "."), collapse all of the |
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* resulting embedded ".." components with trailing cwd components. |
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* We know that getcwd() returns a path name free of symlinks. |
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*/ |
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if (getcwd(cwd, sizeof (cwd)) == NULL) { |
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(void) strlcpy(resolved_name, file_name, PATH_MAX); |
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return (NULL); /* errno set by getcwd() */ |
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} |
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if (len != 0 && strcmp(resolved_name, ".") != 0) { |
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char *relpath = resolved_name; |
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char *endcwd = cwd + strlen(cwd); |
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/* |
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* Eliminate ".." components from the relative path |
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* left-to-right, components from cwd right-to-left. |
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*/ |
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relpath[len++] = '/'; |
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while (len >= 3 && strncmp(relpath, "../", 3) == 0) { |
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relpath += 3; |
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len -= 3; |
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while (*--endcwd != '/') |
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continue; |
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} |
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if (len == 0) { |
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/* the relative path was all ".." components */ |
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*endcwd = '\0'; |
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} else { |
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/* there are non-null components on both sides */ |
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relpath[--len] = '\0'; |
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*endcwd++ = '/'; |
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if (endcwd + len >= cwd + PATH_MAX) { |
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(void) strlcpy(resolved_name, |
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file_name, PATH_MAX); |
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errno = ENAMETOOLONG; |
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return (NULL); |
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} |
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(void) strcpy(endcwd, relpath); |
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} |
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} |
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(void) strcpy(resolved_name, cwd); |
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return (resolved_name); |
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} |
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Roger A. Faulkner <Roger.Faulkner@Oracle.COM>
parents:
6812
diff
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parents:
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/* |
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parents:
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changeset
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* Canonicalize the path given in file_name, resolving away all symbolic link |
48f2dbca79a2
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Roger A. Faulkner <Roger.Faulkner@Oracle.COM>
parents:
6812
diff
changeset
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* components. If resolved_name is a null pointer, return a malloc()d |
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parents:
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* buffer containing the result, else store the result into resolved_name |
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parents:
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* and return resolved_name. Return NULL on failure. |
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parents:
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*/ |
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parents:
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char * |
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parents:
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realpath(const char *file_name, char *resolved_name) |
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parents:
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{ |
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parents:
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char buffer[PATH_MAX]; |
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parents:
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parents:
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if (resolved_name != NULL) |
48f2dbca79a2
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parents:
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return (realpath_impl(file_name, resolved_name)); |
48f2dbca79a2
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parents:
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48f2dbca79a2
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Roger A. Faulkner <Roger.Faulkner@Oracle.COM>
parents:
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diff
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if (realpath_impl(file_name, buffer) != NULL) |
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return (strdup(buffer)); |
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return (NULL); |
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} |
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parents:
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/* |
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parents:
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* GNU extension. |
48f2dbca79a2
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parents:
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*/ |
48f2dbca79a2
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parents:
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char * |
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parents:
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canonicalize_file_name(const char *path) |
48f2dbca79a2
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{ |
48f2dbca79a2
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parents:
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return (realpath(path, NULL)); |
48f2dbca79a2
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} |