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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=4 sw=2 sts=2 et cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/net/DNS.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/mozalloc.h"
#include "mozilla/StaticPrefs_network.h"
#include "nsContentUtils.h"
#include "nsString.h"
#include <string.h>
#ifdef XP_WIN
# include "ws2tcpip.h"
#endif
namespace mozilla {
namespace net {
const char* inet_ntop_internal(int af, const void* src, char* dst,
socklen_t size) {
#ifdef XP_WIN
if (af == AF_INET) {
struct sockaddr_in s;
memset(&s, 0, sizeof(s));
s.sin_family = AF_INET;
memcpy(&s.sin_addr, src, sizeof(struct in_addr));
int result = getnameinfo((struct sockaddr*)&s, sizeof(struct sockaddr_in),
dst, size, nullptr, 0, NI_NUMERICHOST);
if (result == 0) {
return dst;
}
} else if (af == AF_INET6) {
struct sockaddr_in6 s;
memset(&s, 0, sizeof(s));
s.sin6_family = AF_INET6;
memcpy(&s.sin6_addr, src, sizeof(struct in_addr6));
int result = getnameinfo((struct sockaddr*)&s, sizeof(struct sockaddr_in6),
dst, size, nullptr, 0, NI_NUMERICHOST);
if (result == 0) {
return dst;
}
}
return nullptr;
#else
return inet_ntop(af, src, dst, size);
#endif
}
// Copies the contents of a PRNetAddr to a NetAddr.
// Does not do a ptr safety check!
void PRNetAddrToNetAddr(const PRNetAddr* prAddr, NetAddr* addr) {
if (prAddr->raw.family == PR_AF_INET) {
addr->inet.family = AF_INET;
addr->inet.port = prAddr->inet.port;
addr->inet.ip = prAddr->inet.ip;
} else if (prAddr->raw.family == PR_AF_INET6) {
addr->inet6.family = AF_INET6;
addr->inet6.port = prAddr->ipv6.port;
addr->inet6.flowinfo = prAddr->ipv6.flowinfo;
memcpy(&addr->inet6.ip, &prAddr->ipv6.ip, sizeof(addr->inet6.ip.u8));
addr->inet6.scope_id = prAddr->ipv6.scope_id;
}
#if defined(XP_UNIX)
else if (prAddr->raw.family == PR_AF_LOCAL) {
addr->local.family = AF_LOCAL;
memcpy(addr->local.path, prAddr->local.path, sizeof(addr->local.path));
}
#endif
}
extern "C" {
// Rust bindings
uint16_t moz_netaddr_get_family(const NetAddr* addr) {
return addr->raw.family;
}
uint32_t moz_netaddr_get_network_order_ip(const NetAddr* addr) {
return addr->inet.ip;
}
uint8_t const* moz_netaddr_get_ipv6(const NetAddr* addr) {
return addr->inet6.ip.u8;
}
uint16_t moz_netaddr_get_network_order_port(const NetAddr* addr) {
if (addr->raw.family == PR_AF_INET) {
return addr->inet.port;
}
if (addr->raw.family == PR_AF_INET6) {
return addr->inet6.port;
}
return 0;
}
} // extern "C"
// Copies the contents of a NetAddr to a PRNetAddr.
// Does not do a ptr safety check!
void NetAddrToPRNetAddr(const NetAddr* addr, PRNetAddr* prAddr) {
if (addr->raw.family == AF_INET) {
prAddr->inet.family = PR_AF_INET;
prAddr->inet.port = addr->inet.port;
prAddr->inet.ip = addr->inet.ip;
} else if (addr->raw.family == AF_INET6) {
prAddr->ipv6.family = PR_AF_INET6;
prAddr->ipv6.port = addr->inet6.port;
prAddr->ipv6.flowinfo = addr->inet6.flowinfo;
memcpy(&prAddr->ipv6.ip, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
prAddr->ipv6.scope_id = addr->inet6.scope_id;
}
#if defined(XP_UNIX)
else if (addr->raw.family == AF_LOCAL) {
prAddr->local.family = PR_AF_LOCAL;
memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path));
}
#elif defined(XP_WIN)
else if (addr->raw.family == AF_LOCAL) {
prAddr->local.family = PR_AF_LOCAL;
memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path));
}
#endif
}
bool NetAddr::ToStringBuffer(char* buf, uint32_t bufSize) const {
const NetAddr* addr = this;
if (addr->raw.family == AF_INET) {
if (bufSize < INET_ADDRSTRLEN) {
return false;
}
struct in_addr nativeAddr = {};
nativeAddr.s_addr = addr->inet.ip;
return !!inet_ntop_internal(AF_INET, &nativeAddr, buf, bufSize);
}
if (addr->raw.family == AF_INET6) {
if (bufSize < INET6_ADDRSTRLEN) {
return false;
}
struct in6_addr nativeAddr = {};
memcpy(&nativeAddr.s6_addr, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
return !!inet_ntop_internal(AF_INET6, &nativeAddr, buf, bufSize);
}
#if defined(XP_UNIX)
if (addr->raw.family == AF_LOCAL) {
if (bufSize < sizeof(addr->local.path)) {
// Many callers don't bother checking our return value, so
// null-terminate just in case.
if (bufSize > 0) {
buf[0] = '\0';
}
return false;
}
// Usually, the size passed to memcpy should be the size of the
// destination. Here, we know that the source is no larger than the
// destination, so using the source's size is always safe, whereas
// using the destination's size may cause us to read off the end of the
// source.
memcpy(buf, addr->local.path, sizeof(addr->local.path));
return true;
}
#endif
return false;
}
nsCString NetAddr::ToString() const {
nsCString out;
out.SetLength(kNetAddrMaxCStrBufSize);
if (ToStringBuffer(out.BeginWriting(), kNetAddrMaxCStrBufSize)) {
out.SetLength(strlen(out.BeginWriting()));
return out;
}
return ""_ns;
}
bool NetAddr::IsLoopbackAddr() const {
if (IsLoopBackAddressWithoutIPv6Mapping()) {
return true;
}
const NetAddr* addr = this;
if (addr->raw.family != AF_INET6) {
return false;
}
return IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_LOOPBACK);
}
bool NetAddr::IsLoopBackAddressWithoutIPv6Mapping() const {
const NetAddr* addr = this;
if (addr->raw.family == AF_INET) {
// Consider 127.0.0.1/8 as loopback
uint32_t ipv4Addr = ntohl(addr->inet.ip);
return (ipv4Addr >> 24) == 127;
}
return addr->raw.family == AF_INET6 && IPv6ADDR_IS_LOOPBACK(&addr->inet6.ip);
}
bool IsLoopbackHostname(const nsACString& aAsciiHost) {
// If the user has configured to proxy localhost addresses don't consider them
// to be secure
if (StaticPrefs::network_proxy_allow_hijacking_localhost() &&
!StaticPrefs::network_proxy_testing_localhost_is_secure_when_hijacked()) {
return false;
}
nsAutoCString host;
nsContentUtils::ASCIIToLower(aAsciiHost, host);
return host.EqualsLiteral("localhost") ||
StringEndsWith(host, ".localhost"_ns);
}
bool HostIsIPLiteral(const nsACString& aAsciiHost) {
NetAddr addr;
return NS_SUCCEEDED(addr.InitFromString(aAsciiHost));
}
bool NetAddr::IsIPAddrAny() const {
if (this->raw.family == AF_INET) {
if (this->inet.ip == htonl(INADDR_ANY)) {
return true;
}
} else if (this->raw.family == AF_INET6) {
if (IPv6ADDR_IS_UNSPECIFIED(&this->inet6.ip)) {
return true;
}
if (IPv6ADDR_IS_V4MAPPED(&this->inet6.ip) &&
IPv6ADDR_V4MAPPED_TO_IPADDR(&this->inet6.ip) == htonl(INADDR_ANY)) {
return true;
}
}
return false;
}
NetAddr::NetAddr(const PRNetAddr* prAddr) { PRNetAddrToNetAddr(prAddr, this); }
nsresult NetAddr::InitFromString(const nsACString& aString, uint16_t aPort) {
PRNetAddr prAddr{};
memset(&prAddr, 0, sizeof(PRNetAddr));
if (PR_StringToNetAddr(PromiseFlatCString(aString).get(), &prAddr) !=
PR_SUCCESS) {
return NS_ERROR_FAILURE;
}
PRNetAddrToNetAddr(&prAddr, this);
if (this->raw.family == PR_AF_INET) {
this->inet.port = PR_htons(aPort);
} else if (this->raw.family == PR_AF_INET6) {
this->inet6.port = PR_htons(aPort);
}
return NS_OK;
}
bool NetAddr::IsIPAddrV4() const { return this->raw.family == AF_INET; }
bool NetAddr::IsIPAddrV4Mapped() const {
if (this->raw.family == AF_INET6) {
return IPv6ADDR_IS_V4MAPPED(&this->inet6.ip);
}
return false;
}
static bool isLocalIPv4(uint32_t networkEndianIP) {
uint32_t addr32 = ntohl(networkEndianIP);
return addr32 >> 24 == 0x0A || // 10/8 prefix (RFC 1918).
addr32 >> 20 == 0xAC1 || // 172.16/12 prefix (RFC 1918).
addr32 >> 16 == 0xC0A8 || // 192.168/16 prefix (RFC 1918).
addr32 >> 16 == 0xA9FE; // 169.254/16 prefix (Link Local).
}
bool NetAddr::IsIPAddrLocal() const {
const NetAddr* addr = this;
// IPv4 RFC1918 and Link Local Addresses.
if (addr->raw.family == AF_INET) {
return isLocalIPv4(addr->inet.ip);
}
// IPv6 Unique and Link Local Addresses.
// or mapped IPv4 addresses
if (addr->raw.family == AF_INET6) {
uint16_t addr16 = ntohs(addr->inet6.ip.u16[0]);
if (addr16 >> 9 == 0xfc >> 1 || // fc00::/7 Unique Local Address.
addr16 >> 6 == 0xfe80 >> 6) { // fe80::/10 Link Local Address.
return true;
}
if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip)) {
return isLocalIPv4(IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip));
}
}
// Not an IPv4/6 local address.
return false;
}
bool NetAddr::IsIPAddrShared() const {
const NetAddr* addr = this;
// IPv4 RFC6598.
if (addr->raw.family == AF_INET) {
uint32_t addr32 = ntohl(addr->inet.ip);
if (addr32 >> 22 == 0x644 >> 2) { // 100.64/10 prefix (RFC 6598).
return true;
}
}
// Not an IPv4 shared address.
return false;
}
nsresult NetAddr::GetPort(uint16_t* aResult) const {
uint16_t port;
if (this->raw.family == PR_AF_INET) {
port = this->inet.port;
} else if (this->raw.family == PR_AF_INET6) {
port = this->inet6.port;
} else {
return NS_ERROR_NOT_INITIALIZED;
}
*aResult = ntohs(port);
return NS_OK;
}
bool NetAddr::operator==(const NetAddr& other) const {
if (this->raw.family != other.raw.family) {
return false;
}
if (this->raw.family == AF_INET) {
return (this->inet.port == other.inet.port) &&
(this->inet.ip == other.inet.ip);
}
if (this->raw.family == AF_INET6) {
return (this->inet6.port == other.inet6.port) &&
(this->inet6.flowinfo == other.inet6.flowinfo) &&
(memcmp(&this->inet6.ip, &other.inet6.ip, sizeof(this->inet6.ip)) ==
0) &&
(this->inet6.scope_id == other.inet6.scope_id);
#if defined(XP_UNIX)
}
if (this->raw.family == AF_LOCAL) {
return strncmp(this->local.path, other.local.path,
ArrayLength(this->local.path));
#endif
}
return false;
}
bool NetAddr::operator<(const NetAddr& other) const {
if (this->raw.family != other.raw.family) {
return this->raw.family < other.raw.family;
}
if (this->raw.family == AF_INET) {
if (this->inet.ip == other.inet.ip) {
return this->inet.port < other.inet.port;
}
return this->inet.ip < other.inet.ip;
}
if (this->raw.family == AF_INET6) {
int cmpResult =
memcmp(&this->inet6.ip, &other.inet6.ip, sizeof(this->inet6.ip));
if (cmpResult) {
return cmpResult < 0;
}
if (this->inet6.port != other.inet6.port) {
return this->inet6.port < other.inet6.port;
}
return this->inet6.flowinfo < other.inet6.flowinfo;
}
return false;
}
AddrInfo::AddrInfo(const nsACString& host, const PRAddrInfo* prAddrInfo,
bool disableIPv4, bool filterNameCollision,
const nsACString& cname)
: mHostName(host), mCanonicalName(cname) {
MOZ_ASSERT(prAddrInfo,
"Cannot construct AddrInfo with a null prAddrInfo pointer!");
const uint32_t nameCollisionAddr = htonl(0x7f003535); // 127.0.53.53
PRNetAddr tmpAddr;
void* iter = nullptr;
do {
iter = PR_EnumerateAddrInfo(iter, prAddrInfo, 0, &tmpAddr);
bool addIt = iter && (!disableIPv4 || tmpAddr.raw.family != PR_AF_INET) &&
(!filterNameCollision || tmpAddr.raw.family != PR_AF_INET ||
(tmpAddr.inet.ip != nameCollisionAddr));
if (addIt) {
NetAddr elem(&tmpAddr);
mAddresses.AppendElement(elem);
}
} while (iter);
}
AddrInfo::AddrInfo(const nsACString& host, const nsACString& cname,
DNSResolverType aResolverType, unsigned int aTRRType,
nsTArray<NetAddr>&& addresses)
: mHostName(host),
mCanonicalName(cname),
mResolverType(aResolverType),
mTRRType(aTRRType),
mAddresses(std::move(addresses)) {}
AddrInfo::AddrInfo(const nsACString& host, DNSResolverType aResolverType,
unsigned int aTRRType, nsTArray<NetAddr>&& addresses,
uint32_t aTTL)
: ttl(aTTL),
mHostName(host),
mCanonicalName(),
mResolverType(aResolverType),
mTRRType(aTRRType),
mAddresses(std::move(addresses)) {}
// deep copy constructor
AddrInfo::AddrInfo(const AddrInfo* src) {
mHostName = src->mHostName;
mCanonicalName = src->mCanonicalName;
ttl = src->ttl;
mResolverType = src->mResolverType;
mTRRType = src->mTRRType;
mTrrFetchDuration = src->mTrrFetchDuration;
mTrrFetchDurationNetworkOnly = src->mTrrFetchDurationNetworkOnly;
mAddresses = src->mAddresses.Clone();
}
AddrInfo::~AddrInfo() = default;
size_t AddrInfo::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const {
size_t n = mallocSizeOf(this);
n += mHostName.SizeOfExcludingThisIfUnshared(mallocSizeOf);
n += mCanonicalName.SizeOfExcludingThisIfUnshared(mallocSizeOf);
n += mAddresses.ShallowSizeOfExcludingThis(mallocSizeOf);
return n;
}
} // namespace net
} // namespace mozilla