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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2012 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "php.h"
#include "php_filestat.h"
#include "php_globals.h"

#ifdef HAVE_SYMLINK

#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <string.h>
#if HAVE_PWD_H
#ifdef PHP_WIN32
#include "win32/pwd.h"
#else
#include <pwd.h>
#endif
#endif
#if HAVE_GRP_H
#ifdef PHP_WIN32
#include "win32/grp.h"
#else
#include <grp.h>
#endif
#endif
#include <errno.h>
#include <ctype.h>

#include "php_link.h"
#include "php_string.h"

/* {{{ proto string readlink(string filename)
Return the target of a symbolic link */
PHP_FUNCTION(readlink)
{
char *link;
int link_len;
char buff[MAXPATHLEN];
int ret;

if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &link, &link_len) == FAILURE) {
return;
}

if (php_check_open_basedir(link TSRMLS_CC)) {
RETURN_FALSE;
}

ret = php_sys_readlink(link, buff, MAXPATHLEN-1);

if (ret == -1) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}
/* Append NULL to the end of the string */
buff[ret] = '\0';

RETURN_STRING(buff, 1);
}
/* }}} */

/* {{{ proto int linkinfo(string filename)
Returns the st_dev field of the UNIX C stat structure describing the link */
PHP_FUNCTION(linkinfo)
{
char *link;
char *dirname;
int link_len, dir_len;
struct stat sb;
int ret;

if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "p", &link, &link_len) == FAILURE) {
return;
}

dirname = estrndup(link, link_len);
dir_len = php_dirname(dirname, link_len);

if (php_check_open_basedir(dirname TSRMLS_CC)) {
efree(dirname);
RETURN_FALSE;
}

ret = VCWD_LSTAT(link, &sb);
if (ret == -1) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
efree(dirname);
RETURN_LONG(-1L);
}

efree(dirname);
RETURN_LONG((long) sb.st_dev);
}
/* }}} */

/* {{{ proto int symlink(string target, string link)
Create a symbolic link */
PHP_FUNCTION(symlink)
{
char *topath, *frompath;
int topath_len, frompath_len;
int ret;
char source_p[MAXPATHLEN];
char dest_p[MAXPATHLEN];
char dirname[MAXPATHLEN];
size_t len;

if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "pp", &topath, &topath_len, &frompath, &frompath_len) == FAILURE) {
return;
}

if (!expand_filepath(frompath, source_p TSRMLS_CC)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "No such file or directory");
RETURN_FALSE;
}

memcpy(dirname, source_p, sizeof(source_p));
len = php_dirname(dirname, strlen(dirname));

if (!expand_filepath_ex(topath, dest_p, dirname, len TSRMLS_CC)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "No such file or directory");
RETURN_FALSE;
}

if (php_stream_locate_url_wrapper(source_p, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC) ||
php_stream_locate_url_wrapper(dest_p, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC) )
{
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to symlink to a URL");
RETURN_FALSE;
}

if (php_check_open_basedir(dest_p TSRMLS_CC)) {
RETURN_FALSE;
}

if (php_check_open_basedir(source_p TSRMLS_CC)) {
RETURN_FALSE;
}

/* For the source, an expanded path must be used (in ZTS an other thread could have changed the CWD).
* For the target the exact string given by the user must be used, relative or not, existing or not.
* The target is relative to the link itself, not to the CWD. */
ret = symlink(topath, source_p);

if (ret == -1) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}

RETURN_TRUE;
}
/* }}} */

/* {{{ proto int link(string target, string link)
Create a hard link */
PHP_FUNCTION(link)
{
char *topath, *frompath;
int topath_len, frompath_len;
int ret;
char source_p[MAXPATHLEN];
char dest_p[MAXPATHLEN];

if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "pp", &topath, &topath_len, &frompath, &frompath_len) == FAILURE) {
return;
}

if (!expand_filepath(frompath, source_p TSRMLS_CC) || !expand_filepath(topath, dest_p TSRMLS_CC)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "No such file or directory");
RETURN_FALSE;
}

if (php_stream_locate_url_wrapper(source_p, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC) ||
php_stream_locate_url_wrapper(dest_p, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC) )
{
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to link to a URL");
RETURN_FALSE;
}

if (php_check_open_basedir(dest_p TSRMLS_CC)) {
RETURN_FALSE;
}

if (php_check_open_basedir(source_p TSRMLS_CC)) {
RETURN_FALSE;
}

#ifndef ZTS
ret = link(topath, frompath);
#else
ret = link(dest_p, source_p);
#endif
if (ret == -1) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}

RETURN_TRUE;
}
/* }}} */

#endif

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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