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Annotation of embedaddon/curl/src/tool_xattr.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: #include "tool_setup.h"
        !            23: 
        !            24: #ifdef HAVE_FSETXATTR
        !            25: #  include <sys/xattr.h> /* header from libc, not from libattr */
        !            26: #  define USE_XATTR
        !            27: #elif defined(__FreeBSD_version) && (__FreeBSD_version > 500000)
        !            28: #  include <sys/types.h>
        !            29: #  include <sys/extattr.h>
        !            30: #  define USE_XATTR
        !            31: #endif
        !            32: 
        !            33: #include "tool_xattr.h"
        !            34: 
        !            35: #include "memdebug.h" /* keep this as LAST include */
        !            36: 
        !            37: #ifdef USE_XATTR
        !            38: 
        !            39: /* mapping table of curl metadata to extended attribute names */
        !            40: static const struct xattr_mapping {
        !            41:   const char *attr; /* name of the xattr */
        !            42:   CURLINFO info;
        !            43: } mappings[] = {
        !            44:   /* mappings proposed by
        !            45:    * https://freedesktop.org/wiki/CommonExtendedAttributes/
        !            46:    */
        !            47:   { "user.xdg.origin.url", CURLINFO_EFFECTIVE_URL },
        !            48:   { "user.mime_type",      CURLINFO_CONTENT_TYPE },
        !            49:   { NULL,                  CURLINFO_NONE } /* last element, abort loop here */
        !            50: };
        !            51: 
        !            52: /* returns TRUE if a new URL is returned, that then needs to be freed */
        !            53: /* @unittest: 1621 */
        !            54: #ifdef UNITTESTS
        !            55: bool stripcredentials(char **url);
        !            56: #else
        !            57: static
        !            58: #endif
        !            59: bool stripcredentials(char **url)
        !            60: {
        !            61:   CURLU *u;
        !            62:   CURLUcode uc;
        !            63:   char *nurl;
        !            64:   u = curl_url();
        !            65:   if(u) {
        !            66:     uc = curl_url_set(u, CURLUPART_URL, *url, 0);
        !            67:     if(uc)
        !            68:       goto error;
        !            69: 
        !            70:     uc = curl_url_set(u, CURLUPART_USER, NULL, 0);
        !            71:     if(uc)
        !            72:       goto error;
        !            73: 
        !            74:     uc = curl_url_set(u, CURLUPART_PASSWORD, NULL, 0);
        !            75:     if(uc)
        !            76:       goto error;
        !            77: 
        !            78:     uc = curl_url_get(u, CURLUPART_URL, &nurl, 0);
        !            79:     if(uc)
        !            80:       goto error;
        !            81: 
        !            82:     curl_url_cleanup(u);
        !            83: 
        !            84:     *url = nurl;
        !            85:     return TRUE;
        !            86:   }
        !            87:   error:
        !            88:   curl_url_cleanup(u);
        !            89:   return FALSE;
        !            90: }
        !            91: 
        !            92: /* store metadata from the curl request alongside the downloaded
        !            93:  * file using extended attributes
        !            94:  */
        !            95: int fwrite_xattr(CURL *curl, int fd)
        !            96: {
        !            97:   int i = 0;
        !            98:   int err = 0;
        !            99: 
        !           100:   /* loop through all xattr-curlinfo pairs and abort on a set error */
        !           101:   while(err == 0 && mappings[i].attr != NULL) {
        !           102:     char *value = NULL;
        !           103:     CURLcode result = curl_easy_getinfo(curl, mappings[i].info, &value);
        !           104:     if(!result && value) {
        !           105:       bool freeptr = FALSE;
        !           106:       if(CURLINFO_EFFECTIVE_URL == mappings[i].info)
        !           107:         freeptr = stripcredentials(&value);
        !           108:       if(value) {
        !           109: #ifdef HAVE_FSETXATTR_6
        !           110:         err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0, 0);
        !           111: #elif defined(HAVE_FSETXATTR_5)
        !           112:         err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0);
        !           113: #elif defined(__FreeBSD_version)
        !           114:         {
        !           115:           ssize_t rc = extattr_set_fd(fd, EXTATTR_NAMESPACE_USER,
        !           116:                                       mappings[i].attr, value, strlen(value));
        !           117:           /* FreeBSD's extattr_set_fd returns the length of the extended
        !           118:              attribute */
        !           119:           err = (rc < 0 ? -1 : 0);
        !           120:         }
        !           121: #endif
        !           122:         if(freeptr)
        !           123:           curl_free(value);
        !           124:       }
        !           125:     }
        !           126:     i++;
        !           127:   }
        !           128: 
        !           129:   return err;
        !           130: }
        !           131: #else
        !           132: int fwrite_xattr(CURL *curl, int fd)
        !           133: {
        !           134:   (void)curl;
        !           135:   (void)fd;
        !           136: 
        !           137:   return 0;
        !           138: }
        !           139: #endif