network_util.cc revision a3f7b4e666c476898878fa745f637129375cd889 
1// Copyright (c) 2012 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 "chromeos/network/network_util.h"
6
7#include "base/strings/string_tokenizer.h"
8#include "base/strings/stringprintf.h"
9#include "third_party/cros_system_api/dbus/service_constants.h"
10
11namespace chromeos {
12
13SMS::SMS() : validity(0), msgclass(0) {
14}
15
16SMS::~SMS() {
17}
18
19WifiAccessPoint::WifiAccessPoint()
20    : signal_strength(0),
21      signal_to_noise(0),
22      channel(0) {
23}
24
25WifiAccessPoint::~WifiAccessPoint() {
26}
27
28CellularScanResult::CellularScanResult() {
29}
30
31CellularScanResult::~CellularScanResult() {
32}
33
34namespace network_util {
35
36std::string PrefixLengthToNetmask(int32 prefix_length) {
37  std::string netmask;
38  // Return the empty string for invalid inputs.
39  if (prefix_length < 0 || prefix_length > 32)
40    return netmask;
41  for (int i = 0; i < 4; i++) {
42    int remainder = 8;
43    if (prefix_length >= 8) {
44      prefix_length -= 8;
45    } else {
46      remainder = prefix_length;
47      prefix_length = 0;
48    }
49    if (i > 0)
50      netmask += ".";
51    int value = remainder == 0 ? 0 :
52        ((2L << (remainder - 1)) - 1) << (8 - remainder);
53    netmask += base::StringPrintf("%d", value);
54  }
55  return netmask;
56}
57
58int32 NetmaskToPrefixLength(const std::string& netmask) {
59  int count = 0;
60  int prefix_length = 0;
61  base::StringTokenizer t(netmask, ".");
62  while (t.GetNext()) {
63    // If there are more than 4 numbers, then it's invalid.
64    if (count == 4)
65      return -1;
66
67    std::string token = t.token();
68    // If we already found the last mask and the current one is not
69    // "0" then the netmask is invalid. For example, 255.224.255.0
70    if (prefix_length / 8 != count) {
71      if (token != "0")
72        return -1;
73    } else if (token == "255") {
74      prefix_length += 8;
75    } else if (token == "254") {
76      prefix_length += 7;
77    } else if (token == "252") {
78      prefix_length += 6;
79    } else if (token == "248") {
80      prefix_length += 5;
81    } else if (token == "240") {
82      prefix_length += 4;
83    } else if (token == "224") {
84      prefix_length += 3;
85    } else if (token == "192") {
86      prefix_length += 2;
87    } else if (token == "128") {
88      prefix_length += 1;
89    } else if (token == "0") {
90      prefix_length += 0;
91    } else {
92      // mask is not a valid number.
93      return -1;
94    }
95    count++;
96  }
97  if (count < 4)
98    return -1;
99  return prefix_length;
100}
101
102bool ParseCellularScanResults(
103    const ListValue& list, std::vector<CellularScanResult>* scan_results) {
104  scan_results->clear();
105  scan_results->reserve(list.GetSize());
106  for (ListValue::const_iterator it = list.begin(); it != list.end(); ++it) {
107    if (!(*it)->IsType(base::Value::TYPE_DICTIONARY))
108      return false;
109    CellularScanResult scan_result;
110    const DictionaryValue* dict = static_cast<const DictionaryValue*>(*it);
111    // If the network id property is not present then this network cannot be
112    // connected to so don't include it in the results.
113    if (!dict->GetStringWithoutPathExpansion(flimflam::kNetworkIdProperty,
114                                             &scan_result.network_id))
115      continue;
116    dict->GetStringWithoutPathExpansion(flimflam::kStatusProperty,
117                                        &scan_result.status);
118    dict->GetStringWithoutPathExpansion(flimflam::kLongNameProperty,
119                                        &scan_result.long_name);
120    dict->GetStringWithoutPathExpansion(flimflam::kShortNameProperty,
121                                        &scan_result.short_name);
122    dict->GetStringWithoutPathExpansion(flimflam::kTechnologyProperty,
123                                        &scan_result.technology);
124    scan_results->push_back(scan_result);
125  }
126  return true;
127}
128
129}  // namespace network_util
130}  // namespace chromeos
131