blob: a51964db0dc3bcdcbcbd66348204047150e149d6 [file] [log] [blame]
// Copyright 2017 The Cobalt Authors. 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/strings/string_piece.h"
#include "net/base/ip_address.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::IPAddress::kIPv4AddressSize);
case kSbSocketAddressTypeIpv6:
#if SB_HAS(IPV6)
return CompareNBytesOfAddress(ip, source_address, netmask,
net::IPAddress::kIPv6AddressSize);
#else // SB_HAS(IPV6)
NOTREACHED() << "Invalid IP type " << ip.type;
#endif // SB_HAS(IPV6)
}
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