1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/base/net_util.h"
6
7#include <iphlpapi.h>
8
9#include <algorithm>
10
11#include "base/file_path.h"
12#include "base/memory/scoped_ptr.h"
13#include "base/string_piece.h"
14#include "base/string_util.h"
15#include "base/sys_string_conversions.h"
16#include "base/threading/thread_restrictions.h"
17#include "base/utf_string_conversions.h"
18#include "googleurl/src/gurl.h"
19#include "net/base/escape.h"
20#include "net/base/ip_endpoint.h"
21#include "net/base/net_errors.h"
22
23namespace net {
24
25bool FileURLToFilePath(const GURL& url, FilePath* file_path) {
26  *file_path = FilePath();
27  std::wstring& file_path_str = const_cast<std::wstring&>(file_path->value());
28  file_path_str.clear();
29
30  if (!url.is_valid())
31    return false;
32
33  std::string path;
34  std::string host = url.host();
35  if (host.empty()) {
36    // URL contains no host, the path is the filename. In this case, the path
37    // will probably be preceeded with a slash, as in "/C:/foo.txt", so we
38    // trim out that here.
39    path = url.path();
40    size_t first_non_slash = path.find_first_not_of("/\\");
41    if (first_non_slash != std::string::npos && first_non_slash > 0)
42      path.erase(0, first_non_slash);
43  } else {
44    // URL contains a host: this means it's UNC. We keep the preceeding slash
45    // on the path.
46    path = "\\\\";
47    path.append(host);
48    path.append(url.path());
49  }
50
51  if (path.empty())
52    return false;
53  std::replace(path.begin(), path.end(), '/', '\\');
54
55  // GURL stores strings as percent-encoded UTF-8, this will undo if possible.
56  path = UnescapeURLComponent(path,
57      UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
58
59  if (!IsStringUTF8(path)) {
60    // Not UTF-8, assume encoding is native codepage and we're done. We know we
61    // are giving the conversion function a nonempty string, and it may fail if
62    // the given string is not in the current encoding and give us an empty
63    // string back. We detect this and report failure.
64    file_path_str = base::SysNativeMBToWide(path);
65    return !file_path_str.empty();
66  }
67  file_path_str.assign(UTF8ToWide(path));
68
69  // We used to try too hard and see if |path| made up entirely of
70  // the 1st 256 characters in the Unicode was a zero-extended UTF-16.
71  // If so, we converted it to 'Latin-1' and checked if the result was UTF-8.
72  // If the check passed, we converted the result to UTF-8.
73  // Otherwise, we treated the result as the native OS encoding.
74  // However, that led to http://crbug.com/4619 and http://crbug.com/14153
75  return true;
76}
77
78bool GetNetworkList(NetworkInterfaceList* networks) {
79  // GetAdaptersAddresses() may require IO operations.
80  base::ThreadRestrictions::AssertIOAllowed();
81
82  IP_ADAPTER_ADDRESSES info_temp;
83  ULONG len = 0;
84
85  // First get number of networks.
86  ULONG result = GetAdaptersAddresses(AF_UNSPEC, 0, NULL, &info_temp, &len);
87  if (result != ERROR_BUFFER_OVERFLOW) {
88    // There are 0 networks.
89    return true;
90  }
91
92  scoped_array<char> buf(new char[len]);
93  IP_ADAPTER_ADDRESSES *adapters =
94      reinterpret_cast<IP_ADAPTER_ADDRESSES *>(buf.get());
95  result = GetAdaptersAddresses(AF_UNSPEC, 0, NULL, adapters, &len);
96  if (result != NO_ERROR) {
97    LOG(ERROR) << "GetAdaptersAddresses failed: " << result;
98    return false;
99  }
100
101  for (IP_ADAPTER_ADDRESSES *adapter = adapters; adapter != NULL;
102       adapter = adapter->Next) {
103    // Ignore the loopback device.
104    if (adapter->IfType == IF_TYPE_SOFTWARE_LOOPBACK) {
105      continue;
106    }
107
108    IP_ADAPTER_UNICAST_ADDRESS* address;
109    for (address = adapter->FirstUnicastAddress; address != NULL;
110         address = address->Next) {
111      int family = address->Address.lpSockaddr->sa_family;
112      if (family == AF_INET || family == AF_INET6) {
113        IPEndPoint endpoint;
114        if (endpoint.FromSockAddr(address->Address.lpSockaddr,
115                                  address->Address.iSockaddrLength)) {
116          std::string name = adapter->AdapterName;
117          networks->push_back(NetworkInterface(name, endpoint.address()));
118        }
119      }
120    }
121  }
122
123  return true;
124}
125
126}  // namespace net
127