582 lines
15 KiB
C++
582 lines
15 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#if defined(WEBRTC_POSIX)
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#include <netinet/in.h>
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#include <sys/socket.h>
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#ifdef OPENBSD
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#include <netinet/in_systm.h>
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#endif
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#ifndef __native_client__
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#include <netinet/ip.h>
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#endif
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#include <netdb.h>
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#endif
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#include "rtc_base/byte_order.h"
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#include "rtc_base/ip_address.h"
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#include "rtc_base/net_helpers.h"
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#include "rtc_base/string_utils.h"
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#if defined(WEBRTC_WIN)
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#include "rtc_base/win32.h"
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#endif // WEBRTC_WIN
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namespace rtc {
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// Prefixes used for categorizing IPv6 addresses.
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static const in6_addr kV4MappedPrefix = {
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{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0}}};
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static const in6_addr k6To4Prefix = {{{0x20, 0x02, 0}}};
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static const in6_addr kTeredoPrefix = {{{0x20, 0x01, 0x00, 0x00}}};
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static const in6_addr kV4CompatibilityPrefix = {{{0}}};
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static const in6_addr k6BonePrefix = {{{0x3f, 0xfe, 0}}};
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static const in6_addr kPrivateNetworkPrefix = {{{0xFD}}};
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static bool IPIsHelper(const IPAddress& ip,
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const in6_addr& tomatch,
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int length);
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static in_addr ExtractMappedAddress(const in6_addr& addr);
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uint32_t IPAddress::v4AddressAsHostOrderInteger() const {
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if (family_ == AF_INET) {
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return NetworkToHost32(u_.ip4.s_addr);
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} else {
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return 0;
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}
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}
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int IPAddress::overhead() const {
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switch (family_) {
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case AF_INET: // IPv4
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return 20;
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case AF_INET6: // IPv6
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return 40;
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default:
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return 0;
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}
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}
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bool IPAddress::IsNil() const {
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return IPIsUnspec(*this);
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}
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size_t IPAddress::Size() const {
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switch (family_) {
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case AF_INET:
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return sizeof(in_addr);
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case AF_INET6:
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return sizeof(in6_addr);
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}
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return 0;
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}
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bool IPAddress::operator==(const IPAddress& other) const {
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if (family_ != other.family_) {
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return false;
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}
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if (family_ == AF_INET) {
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return memcmp(&u_.ip4, &other.u_.ip4, sizeof(u_.ip4)) == 0;
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}
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if (family_ == AF_INET6) {
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return memcmp(&u_.ip6, &other.u_.ip6, sizeof(u_.ip6)) == 0;
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}
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return family_ == AF_UNSPEC;
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}
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bool IPAddress::operator!=(const IPAddress& other) const {
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return !((*this) == other);
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}
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bool IPAddress::operator>(const IPAddress& other) const {
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return (*this) != other && !((*this) < other);
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}
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bool IPAddress::operator<(const IPAddress& other) const {
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// IPv4 is 'less than' IPv6
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if (family_ != other.family_) {
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if (family_ == AF_UNSPEC) {
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return true;
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}
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if (family_ == AF_INET && other.family_ == AF_INET6) {
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return true;
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}
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return false;
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}
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// Comparing addresses of the same family.
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switch (family_) {
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case AF_INET: {
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return NetworkToHost32(u_.ip4.s_addr) <
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NetworkToHost32(other.u_.ip4.s_addr);
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}
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case AF_INET6: {
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return memcmp(&u_.ip6.s6_addr, &other.u_.ip6.s6_addr, 16) < 0;
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}
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}
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// Catches AF_UNSPEC and invalid addresses.
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return false;
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}
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in6_addr IPAddress::ipv6_address() const {
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return u_.ip6;
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}
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in_addr IPAddress::ipv4_address() const {
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return u_.ip4;
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}
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std::string IPAddress::ToString() const {
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if (family_ != AF_INET && family_ != AF_INET6) {
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return std::string();
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}
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char buf[INET6_ADDRSTRLEN] = {0};
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const void* src = &u_.ip4;
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if (family_ == AF_INET6) {
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src = &u_.ip6;
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}
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if (!rtc::inet_ntop(family_, src, buf, sizeof(buf))) {
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return std::string();
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}
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return std::string(buf);
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}
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std::string IPAddress::ToSensitiveString() const {
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#if !defined(NDEBUG)
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// Return non-stripped in debug.
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return ToString();
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#else
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switch (family_) {
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case AF_INET: {
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std::string address = ToString();
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size_t find_pos = address.rfind('.');
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if (find_pos == std::string::npos)
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return std::string();
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address.resize(find_pos);
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address += ".x";
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return address;
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}
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case AF_INET6: {
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std::string result;
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result.resize(INET6_ADDRSTRLEN);
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in6_addr addr = ipv6_address();
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size_t len = snprintf(&(result[0]), result.size(), "%x:%x:%x:x:x:x:x:x",
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(addr.s6_addr[0] << 8) + addr.s6_addr[1],
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(addr.s6_addr[2] << 8) + addr.s6_addr[3],
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(addr.s6_addr[4] << 8) + addr.s6_addr[5]);
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result.resize(len);
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return result;
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}
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}
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return std::string();
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#endif
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}
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IPAddress IPAddress::Normalized() const {
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if (family_ != AF_INET6) {
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return *this;
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}
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if (!IPIsV4Mapped(*this)) {
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return *this;
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}
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in_addr addr = ExtractMappedAddress(u_.ip6);
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return IPAddress(addr);
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}
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IPAddress IPAddress::AsIPv6Address() const {
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if (family_ != AF_INET) {
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return *this;
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}
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in6_addr v6addr = kV4MappedPrefix;
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::memcpy(&v6addr.s6_addr[12], &u_.ip4.s_addr, sizeof(u_.ip4.s_addr));
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return IPAddress(v6addr);
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}
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bool InterfaceAddress::operator==(const InterfaceAddress& other) const {
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return ipv6_flags_ == other.ipv6_flags() &&
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static_cast<const IPAddress&>(*this) == other;
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}
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bool InterfaceAddress::operator!=(const InterfaceAddress& other) const {
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return !((*this) == other);
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}
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const InterfaceAddress& InterfaceAddress::operator=(
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const InterfaceAddress& other) {
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ipv6_flags_ = other.ipv6_flags_;
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static_cast<IPAddress&>(*this) = other;
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return *this;
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}
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std::string InterfaceAddress::ToString() const {
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std::string result = IPAddress::ToString();
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if (family() == AF_INET6)
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result += "|flags:0x" + rtc::ToHex(ipv6_flags());
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return result;
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}
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static bool IPIsPrivateNetworkV4(const IPAddress& ip) {
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uint32_t ip_in_host_order = ip.v4AddressAsHostOrderInteger();
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return ((ip_in_host_order >> 24) == 10) ||
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((ip_in_host_order >> 20) == ((172 << 4) | 1)) ||
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((ip_in_host_order >> 16) == ((192 << 8) | 168));
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}
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static bool IPIsPrivateNetworkV6(const IPAddress& ip) {
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return IPIsHelper(ip, kPrivateNetworkPrefix, 8);
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}
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bool IPIsPrivateNetwork(const IPAddress& ip) {
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switch (ip.family()) {
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case AF_INET: {
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return IPIsPrivateNetworkV4(ip);
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}
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case AF_INET6: {
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return IPIsPrivateNetworkV6(ip);
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}
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}
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return false;
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}
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static bool IPIsSharedNetworkV4(const IPAddress& ip) {
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uint32_t ip_in_host_order = ip.v4AddressAsHostOrderInteger();
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return (ip_in_host_order >> 22) == ((100 << 2) | 1);
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}
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bool IPIsSharedNetwork(const IPAddress& ip) {
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if (ip.family() == AF_INET) {
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return IPIsSharedNetworkV4(ip);
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}
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return false;
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}
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in_addr ExtractMappedAddress(const in6_addr& in6) {
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in_addr ipv4;
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::memcpy(&ipv4.s_addr, &in6.s6_addr[12], sizeof(ipv4.s_addr));
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return ipv4;
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}
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bool IPFromAddrInfo(struct addrinfo* info, IPAddress* out) {
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if (!info || !info->ai_addr) {
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return false;
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}
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if (info->ai_addr->sa_family == AF_INET) {
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sockaddr_in* addr = reinterpret_cast<sockaddr_in*>(info->ai_addr);
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*out = IPAddress(addr->sin_addr);
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return true;
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} else if (info->ai_addr->sa_family == AF_INET6) {
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sockaddr_in6* addr = reinterpret_cast<sockaddr_in6*>(info->ai_addr);
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*out = IPAddress(addr->sin6_addr);
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return true;
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}
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return false;
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}
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bool IPFromString(const std::string& str, IPAddress* out) {
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if (!out) {
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return false;
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}
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in_addr addr;
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if (rtc::inet_pton(AF_INET, str.c_str(), &addr) == 0) {
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in6_addr addr6;
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if (rtc::inet_pton(AF_INET6, str.c_str(), &addr6) == 0) {
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*out = IPAddress();
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return false;
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}
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*out = IPAddress(addr6);
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} else {
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*out = IPAddress(addr);
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}
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return true;
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}
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bool IPFromString(const std::string& str, int flags, InterfaceAddress* out) {
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IPAddress ip;
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if (!IPFromString(str, &ip)) {
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return false;
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}
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*out = InterfaceAddress(ip, flags);
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return true;
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}
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bool IPIsAny(const IPAddress& ip) {
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switch (ip.family()) {
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case AF_INET:
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return ip == IPAddress(INADDR_ANY);
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case AF_INET6:
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return ip == IPAddress(in6addr_any) || ip == IPAddress(kV4MappedPrefix);
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case AF_UNSPEC:
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return false;
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}
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return false;
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}
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static bool IPIsLoopbackV4(const IPAddress& ip) {
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uint32_t ip_in_host_order = ip.v4AddressAsHostOrderInteger();
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return ((ip_in_host_order >> 24) == 127);
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}
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static bool IPIsLoopbackV6(const IPAddress& ip) {
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return ip == IPAddress(in6addr_loopback);
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}
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bool IPIsLoopback(const IPAddress& ip) {
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switch (ip.family()) {
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case AF_INET: {
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return IPIsLoopbackV4(ip);
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}
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case AF_INET6: {
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return IPIsLoopbackV6(ip);
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}
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}
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return false;
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}
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bool IPIsPrivate(const IPAddress& ip) {
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return IPIsLinkLocal(ip) || IPIsLoopback(ip) || IPIsPrivateNetwork(ip) ||
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IPIsSharedNetwork(ip);
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}
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bool IPIsUnspec(const IPAddress& ip) {
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return ip.family() == AF_UNSPEC;
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}
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size_t HashIP(const IPAddress& ip) {
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switch (ip.family()) {
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case AF_INET: {
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return ip.ipv4_address().s_addr;
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}
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case AF_INET6: {
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in6_addr v6addr = ip.ipv6_address();
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const uint32_t* v6_as_ints =
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reinterpret_cast<const uint32_t*>(&v6addr.s6_addr);
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return v6_as_ints[0] ^ v6_as_ints[1] ^ v6_as_ints[2] ^ v6_as_ints[3];
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}
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}
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return 0;
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}
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IPAddress TruncateIP(const IPAddress& ip, int length) {
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if (length < 0) {
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return IPAddress();
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}
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if (ip.family() == AF_INET) {
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if (length > 31) {
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return ip;
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}
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if (length == 0) {
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return IPAddress(INADDR_ANY);
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}
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int mask = (0xFFFFFFFF << (32 - length));
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uint32_t host_order_ip = NetworkToHost32(ip.ipv4_address().s_addr);
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in_addr masked;
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masked.s_addr = HostToNetwork32(host_order_ip & mask);
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return IPAddress(masked);
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} else if (ip.family() == AF_INET6) {
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if (length > 127) {
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return ip;
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}
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if (length == 0) {
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return IPAddress(in6addr_any);
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}
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in6_addr v6addr = ip.ipv6_address();
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int position = length / 32;
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int inner_length = 32 - (length - (position * 32));
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// Note: 64bit mask constant needed to allow possible 32-bit left shift.
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uint32_t inner_mask = 0xFFFFFFFFLL << inner_length;
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uint32_t* v6_as_ints = reinterpret_cast<uint32_t*>(&v6addr.s6_addr);
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for (int i = 0; i < 4; ++i) {
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if (i == position) {
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uint32_t host_order_inner = NetworkToHost32(v6_as_ints[i]);
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v6_as_ints[i] = HostToNetwork32(host_order_inner & inner_mask);
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} else if (i > position) {
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v6_as_ints[i] = 0;
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}
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}
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return IPAddress(v6addr);
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}
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return IPAddress();
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}
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int CountIPMaskBits(const IPAddress& mask) {
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uint32_t word_to_count = 0;
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int bits = 0;
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switch (mask.family()) {
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case AF_INET: {
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word_to_count = NetworkToHost32(mask.ipv4_address().s_addr);
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break;
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}
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case AF_INET6: {
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in6_addr v6addr = mask.ipv6_address();
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const uint32_t* v6_as_ints =
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reinterpret_cast<const uint32_t*>(&v6addr.s6_addr);
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int i = 0;
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for (; i < 4; ++i) {
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if (v6_as_ints[i] != 0xFFFFFFFF) {
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break;
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}
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}
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if (i < 4) {
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word_to_count = NetworkToHost32(v6_as_ints[i]);
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}
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bits = (i * 32);
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break;
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}
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default: {
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return 0;
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}
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}
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if (word_to_count == 0) {
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return bits;
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}
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// Public domain bit-twiddling hack from:
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// http://graphics.stanford.edu/~seander/bithacks.html
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// Counts the trailing 0s in the word.
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unsigned int zeroes = 32;
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// This could also be written word_to_count &= -word_to_count, but
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// MSVC emits warning C4146 when negating an unsigned number.
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word_to_count &= ~word_to_count + 1; // Isolate lowest set bit.
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if (word_to_count)
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zeroes--;
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if (word_to_count & 0x0000FFFF)
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zeroes -= 16;
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if (word_to_count & 0x00FF00FF)
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zeroes -= 8;
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if (word_to_count & 0x0F0F0F0F)
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zeroes -= 4;
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if (word_to_count & 0x33333333)
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zeroes -= 2;
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if (word_to_count & 0x55555555)
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zeroes -= 1;
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return bits + (32 - zeroes);
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}
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bool IPIsHelper(const IPAddress& ip, const in6_addr& tomatch, int length) {
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// Helper method for checking IP prefix matches (but only on whole byte
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// lengths). Length is in bits.
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in6_addr addr = ip.ipv6_address();
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return ::memcmp(&addr, &tomatch, (length >> 3)) == 0;
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}
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bool IPIs6Bone(const IPAddress& ip) {
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return IPIsHelper(ip, k6BonePrefix, 16);
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}
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bool IPIs6To4(const IPAddress& ip) {
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return IPIsHelper(ip, k6To4Prefix, 16);
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}
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static bool IPIsLinkLocalV4(const IPAddress& ip) {
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uint32_t ip_in_host_order = ip.v4AddressAsHostOrderInteger();
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return ((ip_in_host_order >> 16) == ((169 << 8) | 254));
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}
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static bool IPIsLinkLocalV6(const IPAddress& ip) {
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// Can't use the helper because the prefix is 10 bits.
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in6_addr addr = ip.ipv6_address();
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return (addr.s6_addr[0] == 0xFE) && ((addr.s6_addr[1] & 0xC0) == 0x80);
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}
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bool IPIsLinkLocal(const IPAddress& ip) {
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switch (ip.family()) {
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case AF_INET: {
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return IPIsLinkLocalV4(ip);
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}
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case AF_INET6: {
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return IPIsLinkLocalV6(ip);
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}
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}
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return false;
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}
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|
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// According to http://www.ietf.org/rfc/rfc2373.txt, Appendix A, page 19. An
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// address which contains MAC will have its 11th and 12th bytes as FF:FE as well
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// as the U/L bit as 1.
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bool IPIsMacBased(const IPAddress& ip) {
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in6_addr addr = ip.ipv6_address();
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return ((addr.s6_addr[8] & 0x02) && addr.s6_addr[11] == 0xFF &&
|
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addr.s6_addr[12] == 0xFE);
|
|
}
|
|
|
|
bool IPIsSiteLocal(const IPAddress& ip) {
|
|
// Can't use the helper because the prefix is 10 bits.
|
|
in6_addr addr = ip.ipv6_address();
|
|
return addr.s6_addr[0] == 0xFE && (addr.s6_addr[1] & 0xC0) == 0xC0;
|
|
}
|
|
|
|
bool IPIsULA(const IPAddress& ip) {
|
|
// Can't use the helper because the prefix is 7 bits.
|
|
in6_addr addr = ip.ipv6_address();
|
|
return (addr.s6_addr[0] & 0xFE) == 0xFC;
|
|
}
|
|
|
|
bool IPIsTeredo(const IPAddress& ip) {
|
|
return IPIsHelper(ip, kTeredoPrefix, 32);
|
|
}
|
|
|
|
bool IPIsV4Compatibility(const IPAddress& ip) {
|
|
return IPIsHelper(ip, kV4CompatibilityPrefix, 96);
|
|
}
|
|
|
|
bool IPIsV4Mapped(const IPAddress& ip) {
|
|
return IPIsHelper(ip, kV4MappedPrefix, 96);
|
|
}
|
|
|
|
int IPAddressPrecedence(const IPAddress& ip) {
|
|
// Precedence values from RFC 3484-bis. Prefers native v4 over 6to4/Teredo.
|
|
if (ip.family() == AF_INET) {
|
|
return 30;
|
|
} else if (ip.family() == AF_INET6) {
|
|
if (IPIsLoopback(ip)) {
|
|
return 60;
|
|
} else if (IPIsULA(ip)) {
|
|
return 50;
|
|
} else if (IPIsV4Mapped(ip)) {
|
|
return 30;
|
|
} else if (IPIs6To4(ip)) {
|
|
return 20;
|
|
} else if (IPIsTeredo(ip)) {
|
|
return 10;
|
|
} else if (IPIsV4Compatibility(ip) || IPIsSiteLocal(ip) || IPIs6Bone(ip)) {
|
|
return 1;
|
|
} else {
|
|
// A 'normal' IPv6 address.
|
|
return 40;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
IPAddress GetLoopbackIP(int family) {
|
|
if (family == AF_INET) {
|
|
return rtc::IPAddress(INADDR_LOOPBACK);
|
|
}
|
|
if (family == AF_INET6) {
|
|
return rtc::IPAddress(in6addr_loopback);
|
|
}
|
|
return rtc::IPAddress();
|
|
}
|
|
|
|
IPAddress GetAnyIP(int family) {
|
|
if (family == AF_INET) {
|
|
return rtc::IPAddress(INADDR_ANY);
|
|
}
|
|
if (family == AF_INET6) {
|
|
return rtc::IPAddress(in6addr_any);
|
|
}
|
|
return rtc::IPAddress();
|
|
}
|
|
|
|
} // namespace rtc
|