util_win32.c

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/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef WIN32

#include <sys/stat.h>
#include <stdarg.h>
#include <time.h>
#include <stdlib.h>

#include "httpd.h"
#include "http_log.h"

/* Returns TRUE if the input string is a string
 * of one or more '.' characters.
 */
static BOOL OnlyDots(char *pString)
{
    char *c;

    if (*pString == '\0')
        return FALSE;

    for (c = pString;*c;c++)
        if (*c != '.')
            return FALSE;

    return TRUE;
}


/* Accepts as input a pathname, and tries to match it to an 
 * existing path and return the pathname in the case that
 * is present on the existing path.  This routine also
 * converts alias names to long names.
 *
 * WARNING: Folding to systemcase fails when /path/to/foo/../bar
 * is given and foo does not exist, is not a directory.
 */
API_EXPORT(char *) ap_os_systemcase_filename(pool *pPool, 
                                             const char *szFile)
{
    char *buf, *t, *r;
    const char *q, *p;
    BOOL bDone = FALSE;
    BOOL bFileExists = TRUE;
    HANDLE hFind;
    WIN32_FIND_DATA wfd;
    size_t buflen;
    int slack = 0;

    if (!szFile || strlen(szFile) == 0)
        return ap_pstrdup(pPool, "");

    buflen = strlen(szFile);
    t = buf = ap_palloc(pPool, buflen + 1);
    q = szFile;

    /* If there is drive information, copy it over. */ 
    if (szFile[1] == ':') {
        /* Lowercase, so that when systemcase is used for
         * comparison, d: designations will match
         */                 
        *(t++) = tolower(*(q++));
        *(t++) = *(q++);
    }
    else if ((*q == '/') || (*q == '\\')) {
        /* Get past the root path (/ or //foo/bar/) so we can go
         * on to normalize individual path elements.
         */
        *(t++) = '\\', ++q;
        if ((*q == '/') || (*q == '\\'))  /* UNC name */
        {
                /* Lower-case the machine name, so compares match.
                 * FindFirstFile won't parse \\machine alone
                 */
            *(t++) = '\\', ++q;
            for (p = q; *p && (*p != '/') && (*p != '\\'); ++p)
                /* continue */ ;
            if (*p || p > q) 
            {
                /* Lower-case the machine name, so compares match.
                 * FindFirstFile won't parse \\machine\share alone
                 */
                memcpy(t, q, p - q);
                t[p - q] = '\0';
                strlwr(t);
                t += p - q;
                q = p;
                if (*p) {
                    *(t++) = '\\', ++q;
                    for (p = q; *p && (*p != '/') && (*p != '\\'); ++p)
                        /* continue */ ;
                    if (*p || p > q) 
                    {
                        /* Copy the lower-cased share name.  FindFirstFile 
                         * cannot not find a \\machine\share name only 
                         */
                        memcpy(t, q, p - q);
                        t[p - q] = '\0';
                        strlwr(t);
                        t += p - q;
                        q = p;
                        if (*p)
                            *(t++) = '\\', ++q;
                        else
                            bFileExists = FALSE;
                    }
                    else
                        bFileExists = FALSE;
                }
                else
                    bFileExists = FALSE;
            }
            else
                bFileExists = FALSE;
        }
    }

    while (bFileExists) {

        /* parse past any leading slashes */
        for (; (*q == '/') || (*q == '\\'); ++q)
            *(t++) = '\\';

        /* break on end of string */
        if (!*q)
            break;

        /* get to the end of this path segment */
        for (p = q; *p && (*p != '/') && (*p != '\\'); ++p)
            /* continue */ ;
                
        /* copy the segment */
        memcpy(t, q, p - q);
        t[p - q] = '\0';

        /* Test for nasties that can exhibit undesired effects */
        if (strpbrk(t, "?\"<>*|:")) {
            t += p - q;
            q = p;
            break;
        }

        /* If the path exists so far, call FindFirstFile
         * again.  However, if this portion of the path contains
         * only '.' charaters, skip the call to FindFirstFile
         * since it will convert '.' and '..' to actual names.
         * On win32, '...' is an alias for '..', so we gain 
         * a bit of slack.
         */
        if (*t == '.' && OnlyDots(t)) {
            if (p - q == 3) {
                t += 2;
                q = p;
                ++slack;
            }
            else {
                t += p - q;
                q = p;
            }
            /* Paths of 4 dots or more are invalid */
            if (p - q > 3)
                break;
        }
        else {
            if ((hFind = FindFirstFile(buf, &wfd)) == INVALID_HANDLE_VALUE) {
                t += p - q;
                q = p;
                break;
            }
            else {
                size_t fnlen = strlen(wfd.cFileName);
                FindClose(hFind);
                /* the string length just changed, could have shrunk
                 * (trailing spaces or dots) or could have grown 
                 * (longer filename aliases).  Realloc as necessary
                 */
                slack -= fnlen - (p - q);
                if (slack < 0) {
                    char *n;
                    slack += buflen + fnlen - (p - q);
                    buflen += buflen + fnlen - (p - q);
                    n = ap_palloc(pPool, buflen + 1);
                    memcpy (n, buf, t - buf);
                    t = n + (t - buf);
                    buf = n;
                }
                memcpy(t, wfd.cFileName, fnlen);
                t += fnlen;
                q = p;
                if (!(wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
                    break;
            }
        }
    }

    /* Convert all parsed '\'s to '/' for canonical form (doesn't touch
     * the non-existant portion of the path whatsoever.)
     */
    for (r = buf; r < t; ++r) {
        if (*r == '\\')
            *r = '/';
    }

    /* Copy the non-existant portion (minimally nul-terminates the string) */
    strcpy(t, q);
    
    return buf;
}


/*  Perform canonicalization with the exception that the
 *  input case is preserved.
 */
API_EXPORT(char *) ap_os_case_canonical_filename(pool *pPool, 
                                                 const char *szFile)
{
    char *pNewStr;
    char *s;
    char *p; 
    char *q;

    if (szFile == NULL || strlen(szFile) == 0)
        return ap_pstrdup(pPool, "");

    pNewStr = ap_pstrdup(pPool, szFile);

    /*  Change all '\' characters to '/' characters.
     *  While doing this, remove any trailing '.'.
     *  Also, blow away any directories with 3 or
     *  more '.'
     */
    for (p = pNewStr,s = pNewStr; *s; s++,p++) {
        if (*s == '\\' || *s == '/') {

            q = p;
            while (p > pNewStr && *(p-1) == '.')
                p--;

            if (p == pNewStr && q-p <= 2 && *p == '.')
                p = q;
            else if (p > pNewStr && p < q && *(p-1) == '/') {
                if (q-p > 2)
                    p--;
                else
                    p = q;
            }

            *p = '/';
        }
        else {
            *p = *s;