chromeos/network/network_util.cc

   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
  11 namespace chromeos {
  12
  13 SMS::SMS() : validity(0), msgclass(0) {
  14 }
  15
  16 SMS::~SMS() {
  17 }
  18
  19 WifiAccessPoint::WifiAccessPoint()
  20     : signal_strength(0),
  21       signal_to_noise(0),
  22       channel(0) {
  23 }
  24
  25 WifiAccessPoint::~WifiAccessPoint() {
  26 }
  27
  28 CellularScanResult::CellularScanResult() {
  29 }
  30
  31 CellularScanResult::~CellularScanResult() {
  32 }
  33
  34 namespace network_util {
  35
  36 std::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
  58 int32 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
 102 bool 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