| // Copyright 2017 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/network/local_network.h" |
| |
| #include "base/logging.h" |
| #include "base/string_piece.h" |
| #include "net/base/net_util.h" |
| |
| namespace cobalt { |
| namespace network { |
| |
| namespace { |
| |
| bool CompareNBytesOfAddress(const SbSocketAddress& ip, |
| const SbSocketAddress& source_address, |
| const SbSocketAddress& netmask, |
| size_t number_bytes_to_compare) { |
| for (size_t i = 0; i != number_bytes_to_compare; ++i) { |
| if ((ip.address[i] & netmask.address[i]) != |
| (source_address.address[i] & netmask.address[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool IsLocalIP(const SbSocketAddress& ip, const SbSocketAddress& source_address, |
| const SbSocketAddress& netmask) { |
| DCHECK(source_address.type == ip.type); |
| DCHECK(netmask.type == ip.type); |
| |
| switch (ip.type) { |
| case kSbSocketAddressTypeIpv4: |
| return CompareNBytesOfAddress(ip, source_address, netmask, |
| net::kIPv4AddressSize); |
| #if SB_HAS(IPV6) |
| case kSbSocketAddressTypeIpv6: |
| return CompareNBytesOfAddress(ip, source_address, netmask, |
| net::kIPv6AddressSize); |
| #endif |
| default: |
| NOTREACHED() << "Invalid IP type " << ip.type; |
| return false; |
| } |
| } |
| |
| } // namespace |
| |
| bool IsIPInLocalNetwork(const SbSocketAddress& destination) { |
| SbSocketAddress source_address; |
| SbSocketAddress netmask; |
| if (!(SbSocketGetInterfaceAddress(&destination, &source_address, &netmask))) { |
| return false; |
| } |
| return IsLocalIP(destination, source_address, netmask); |
| } |
| |
| bool IsIPInPrivateRange(const SbSocketAddress& ip) { |
| // For IPv4, the private address range is defined by RFC 1918 |
| // avaiable at https://tools.ietf.org/html/rfc1918#section-3. |
| if (ip.type == kSbSocketAddressTypeIpv4) { |
| if (ip.address[0] == 10) { |
| // IP is in range 10.0.0.0 - 10.255.255.255 (10/8 prefix). |
| return true; |
| } |
| if ((ip.address[0] == 192) && (ip.address[1] == 168)) { |
| // IP is in range 192.168.0.0 - 192.168.255.255 (192.168/16 prefix). |
| return true; |
| } |
| if ((ip.address[0] == 172) && |
| ((ip.address[1] >= 16) || (ip.address[1] <= 31))) { |
| // IP is in range 172.16.0.0 - 172.31.255.255 (172.16/12 prefix). |
| return true; |
| } |
| } |
| #if SB_HAS(IPV6) |
| if (ip.type == kSbSocketAddressTypeIpv6) { |
| // Unique Local Addresses for IPv6 are _effectively_ fd00::/8. |
| // See https://tools.ietf.org/html/rfc4193#section-3 for details. |
| return ip.address[0] == 0xfd && ip.address[1] == 0; |
| } |
| #endif |
| |
| return false; |
| } |
| |
| } // namespace network |
| } // namespace cobalt |