aboutsummaryrefslogtreecommitdiff
path: root/src/tool_xattr.c
blob: 730381ba9400addcb24e888c04c6ea77c429e03b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
#include "tool_setup.h"

#ifdef HAVE_FSETXATTR
#  include <sys/xattr.h> /* header from libc, not from libattr */
#  define USE_XATTR
#elif defined(__FreeBSD_version) && (__FreeBSD_version > 500000)
#  include <sys/types.h>
#  include <sys/extattr.h>
#  define USE_XATTR
#endif

#include "tool_xattr.h"

#include "memdebug.h" /* keep this as LAST include */

#ifdef USE_XATTR

/* mapping table of curl metadata to extended attribute names */
static const struct xattr_mapping {
  const char *attr; /* name of the xattr */
  CURLINFO info;
} mappings[] = {
  /* mappings proposed by
   * https://freedesktop.org/wiki/CommonExtendedAttributes/
   */
  { "user.xdg.origin.url", CURLINFO_EFFECTIVE_URL },
  { "user.mime_type",      CURLINFO_CONTENT_TYPE },
  { NULL,                  CURLINFO_NONE } /* last element, abort loop here */
};

/* returns TRUE if a new URL is returned, that then needs to be freed */
/* @unittest: 1621 */
#ifdef UNITTESTS
bool stripcredentials(char **url);
#else
static
#endif
bool stripcredentials(char **url)
{
  CURLU *u;
  CURLUcode uc;
  char *nurl;
  u = curl_url();
  if(u) {
    uc = curl_url_set(u, CURLUPART_URL, *url, 0);
    if(uc)
      goto error;

    uc = curl_url_set(u, CURLUPART_USER, NULL, 0);
    if(uc)
      goto error;

    uc = curl_url_set(u, CURLUPART_PASSWORD, NULL, 0);
    if(uc)
      goto error;

    uc = curl_url_get(u, CURLUPART_URL, &nurl, 0);
    if(uc)
      goto error;

    curl_url_cleanup(u);

    *url = nurl;
    return TRUE;
  }
  error:
  curl_url_cleanup(u);
  return FALSE;
}

/* store metadata from the curl request alongside the downloaded
 * file using extended attributes
 */
int fwrite_xattr(CURL *curl, int fd)
{
  int i = 0;
  int err = 0;

  /* loop through all xattr-curlinfo pairs and abort on a set error */
  while(err == 0 && mappings[i].attr != NULL) {
    char *value = NULL;
    CURLcode result = curl_easy_getinfo(curl, mappings[i].info, &value);
    if(!result && value) {
      bool freeptr = FALSE;
      if(CURLINFO_EFFECTIVE_URL == mappings[i].info)
        freeptr = stripcredentials(&value);
      if(value) {
#ifdef HAVE_FSETXATTR_6
        err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0, 0);
#elif defined(HAVE_FSETXATTR_5)
        err = fsetxattr(fd, mappings[i].attr, value, strlen(value), 0);
#elif defined(__FreeBSD_version)
        err = extattr_set_fd(fd, EXTATTR_NAMESPACE_USER, mappings[i].attr,
                             value, strlen(value));
        /* FreeBSD's extattr_set_fd returns the length of the extended
           attribute */
        err = err < 0 ? err : 0;
#endif
        if(freeptr)
          curl_free(value);
      }
    }
    i++;
  }

  return err;
}
#else
int fwrite_xattr(CURL *curl, int fd)
{
  (void)curl;
  (void)fd;

  return 0;
}
#endif