17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
57257d1b4Sraf * Common Development and Distribution License (the "License").
67257d1b4Sraf * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
217257d1b4Sraf
227c478bd9Sstevel@tonic-gate /*
23*23a1cceaSRoger A. Faulkner * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
247c478bd9Sstevel@tonic-gate */
257c478bd9Sstevel@tonic-gate
267c478bd9Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
277c478bd9Sstevel@tonic-gate /* All Rights Reserved */
287c478bd9Sstevel@tonic-gate
297257d1b4Sraf #include "lint.h"
307c478bd9Sstevel@tonic-gate #include <sys/types.h>
317c478bd9Sstevel@tonic-gate #include <dirent.h>
327c478bd9Sstevel@tonic-gate #include <sys/param.h>
337c478bd9Sstevel@tonic-gate #include <limits.h>
347c478bd9Sstevel@tonic-gate #include <errno.h>
357c478bd9Sstevel@tonic-gate #include <stdlib.h>
367c478bd9Sstevel@tonic-gate #include <unistd.h>
377c478bd9Sstevel@tonic-gate #include <string.h>
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate /*
407c478bd9Sstevel@tonic-gate * Canonicalize the path given in file_name, resolving away all symbolic link
417c478bd9Sstevel@tonic-gate * components. Store the result into the buffer named by resolved_name, which
42*23a1cceaSRoger A. Faulkner * must be long enough (PATH_MAX bytes will suffice). Returns NULL
437c478bd9Sstevel@tonic-gate * on failure and resolved_name on success. On failure, to maintain
447c478bd9Sstevel@tonic-gate * compatibility with the past, the contents of file_name will be copied
457c478bd9Sstevel@tonic-gate * into resolved_name.
467c478bd9Sstevel@tonic-gate */
47*23a1cceaSRoger A. Faulkner static char *
realpath_impl(const char * file_name,char * resolved_name)48*23a1cceaSRoger A. Faulkner realpath_impl(const char *file_name, char *resolved_name)
497c478bd9Sstevel@tonic-gate {
507c478bd9Sstevel@tonic-gate char cwd[PATH_MAX];
517c478bd9Sstevel@tonic-gate int len;
527c478bd9Sstevel@tonic-gate
53*23a1cceaSRoger A. Faulkner if (file_name == NULL) {
547c478bd9Sstevel@tonic-gate errno = EINVAL;
557c478bd9Sstevel@tonic-gate return (NULL);
567c478bd9Sstevel@tonic-gate }
577c478bd9Sstevel@tonic-gate
587c478bd9Sstevel@tonic-gate /*
597c478bd9Sstevel@tonic-gate * Call resolvepath() to resolve all the symlinks in file_name,
607c478bd9Sstevel@tonic-gate * eliminate embedded "." components, and collapse embedded ".."
617c478bd9Sstevel@tonic-gate * components. We may be left with leading ".." components.
627c478bd9Sstevel@tonic-gate */
637c478bd9Sstevel@tonic-gate if ((len = resolvepath(file_name, resolved_name, PATH_MAX)) < 0) {
647c478bd9Sstevel@tonic-gate (void) strlcpy(resolved_name, file_name, PATH_MAX);
657c478bd9Sstevel@tonic-gate return (NULL); /* errno set by resolvepath() */
667c478bd9Sstevel@tonic-gate }
677c478bd9Sstevel@tonic-gate
687c478bd9Sstevel@tonic-gate if (len >= PATH_MAX) /* "can't happen" */
697c478bd9Sstevel@tonic-gate len = PATH_MAX - 1;
707c478bd9Sstevel@tonic-gate resolved_name[len] = '\0';
717c478bd9Sstevel@tonic-gate
727c478bd9Sstevel@tonic-gate if (*resolved_name == '/') /* nothing more to do */
737c478bd9Sstevel@tonic-gate return (resolved_name);
747c478bd9Sstevel@tonic-gate
757c478bd9Sstevel@tonic-gate /*
767c478bd9Sstevel@tonic-gate * Prepend the current working directory to the relative path.
777c478bd9Sstevel@tonic-gate * If the relative path is not empty (or "."), collapse all of the
787c478bd9Sstevel@tonic-gate * resulting embedded ".." components with trailing cwd components.
797c478bd9Sstevel@tonic-gate * We know that getcwd() returns a path name free of symlinks.
807c478bd9Sstevel@tonic-gate */
817c478bd9Sstevel@tonic-gate if (getcwd(cwd, sizeof (cwd)) == NULL) {
827c478bd9Sstevel@tonic-gate (void) strlcpy(resolved_name, file_name, PATH_MAX);
837c478bd9Sstevel@tonic-gate return (NULL); /* errno set by getcwd() */
847c478bd9Sstevel@tonic-gate }
857c478bd9Sstevel@tonic-gate
867c478bd9Sstevel@tonic-gate if (len != 0 && strcmp(resolved_name, ".") != 0) {
877c478bd9Sstevel@tonic-gate char *relpath = resolved_name;
887c478bd9Sstevel@tonic-gate char *endcwd = cwd + strlen(cwd);
897c478bd9Sstevel@tonic-gate
907c478bd9Sstevel@tonic-gate /*
917c478bd9Sstevel@tonic-gate * Eliminate ".." components from the relative path
927c478bd9Sstevel@tonic-gate * left-to-right, components from cwd right-to-left.
937c478bd9Sstevel@tonic-gate */
947c478bd9Sstevel@tonic-gate relpath[len++] = '/';
957c478bd9Sstevel@tonic-gate while (len >= 3 && strncmp(relpath, "../", 3) == 0) {
967c478bd9Sstevel@tonic-gate relpath += 3;
977c478bd9Sstevel@tonic-gate len -= 3;
987c478bd9Sstevel@tonic-gate while (*--endcwd != '/')
997c478bd9Sstevel@tonic-gate continue;
1007c478bd9Sstevel@tonic-gate }
1017c478bd9Sstevel@tonic-gate if (len == 0) {
1027c478bd9Sstevel@tonic-gate /* the relative path was all ".." components */
1037c478bd9Sstevel@tonic-gate *endcwd = '\0';
1047c478bd9Sstevel@tonic-gate } else {
1057c478bd9Sstevel@tonic-gate /* there are non-null components on both sides */
1067c478bd9Sstevel@tonic-gate relpath[--len] = '\0';
1077c478bd9Sstevel@tonic-gate *endcwd++ = '/';
1087c478bd9Sstevel@tonic-gate if (endcwd + len >= cwd + PATH_MAX) {
1097c478bd9Sstevel@tonic-gate (void) strlcpy(resolved_name,
1107c478bd9Sstevel@tonic-gate file_name, PATH_MAX);
1117c478bd9Sstevel@tonic-gate errno = ENAMETOOLONG;
1127c478bd9Sstevel@tonic-gate return (NULL);
1137c478bd9Sstevel@tonic-gate }
1147c478bd9Sstevel@tonic-gate (void) strcpy(endcwd, relpath);
1157c478bd9Sstevel@tonic-gate }
1167c478bd9Sstevel@tonic-gate }
1177c478bd9Sstevel@tonic-gate
1187c478bd9Sstevel@tonic-gate (void) strcpy(resolved_name, cwd);
1197c478bd9Sstevel@tonic-gate return (resolved_name);
1207c478bd9Sstevel@tonic-gate }
121*23a1cceaSRoger A. Faulkner
122*23a1cceaSRoger A. Faulkner /*
123*23a1cceaSRoger A. Faulkner * Canonicalize the path given in file_name, resolving away all symbolic link
124*23a1cceaSRoger A. Faulkner * components. If resolved_name is a null pointer, return a malloc()d
125*23a1cceaSRoger A. Faulkner * buffer containing the result, else store the result into resolved_name
126*23a1cceaSRoger A. Faulkner * and return resolved_name. Return NULL on failure.
127*23a1cceaSRoger A. Faulkner */
128*23a1cceaSRoger A. Faulkner char *
realpath(const char * file_name,char * resolved_name)129*23a1cceaSRoger A. Faulkner realpath(const char *file_name, char *resolved_name)
130*23a1cceaSRoger A. Faulkner {
131*23a1cceaSRoger A. Faulkner char buffer[PATH_MAX];
132*23a1cceaSRoger A. Faulkner
133*23a1cceaSRoger A. Faulkner if (resolved_name != NULL)
134*23a1cceaSRoger A. Faulkner return (realpath_impl(file_name, resolved_name));
135*23a1cceaSRoger A. Faulkner
136*23a1cceaSRoger A. Faulkner if (realpath_impl(file_name, buffer) != NULL)
137*23a1cceaSRoger A. Faulkner return (strdup(buffer));
138*23a1cceaSRoger A. Faulkner
139*23a1cceaSRoger A. Faulkner return (NULL);
140*23a1cceaSRoger A. Faulkner }
141*23a1cceaSRoger A. Faulkner
142*23a1cceaSRoger A. Faulkner /*
143*23a1cceaSRoger A. Faulkner * GNU extension.
144*23a1cceaSRoger A. Faulkner */
145*23a1cceaSRoger A. Faulkner char *
canonicalize_file_name(const char * path)146*23a1cceaSRoger A. Faulkner canonicalize_file_name(const char *path)
147*23a1cceaSRoger A. Faulkner {
148*23a1cceaSRoger A. Faulkner return (realpath(path, NULL));
149*23a1cceaSRoger A. Faulkner }
150