root/ext/standard/link.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. PHP_FUNCTION
  2. PHP_FUNCTION
  3. PHP_FUNCTION
  4. PHP_FUNCTION

/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2015 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, "p", &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
 */

/* [<][>][^][v][top][bottom][index][help] */