diff options
Diffstat (limited to 'netwerk/dns/DNS.cpp')
| -rw-r--r-- | netwerk/dns/DNS.cpp | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/netwerk/dns/DNS.cpp b/netwerk/dns/DNS.cpp new file mode 100644 index 0000000000..c9d3e46ca3 --- /dev/null +++ b/netwerk/dns/DNS.cpp @@ -0,0 +1,382 @@ +/* -*- 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 +} + +// 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; +} + +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()) { + return false; + } + + nsAutoCString host; + nsContentUtils::ASCIIToLower(aAsciiHost, host); + + return host.EqualsLiteral("localhost") || + StringEndsWith(host, ".localhost"_ns); +} + +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); } + +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); + if (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). + return true; + } + return false; +} + +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 PL_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, + unsigned int aTRR, nsTArray<NetAddr>&& addresses) + : mHostName(host), + mCanonicalName(cname), + mFromTRR(aTRR), + mAddresses(std::move(addresses)) {} + +AddrInfo::AddrInfo(const nsACString& host, unsigned int aTRR, + nsTArray<NetAddr>&& addresses, uint32_t aTTL) + : ttl(aTTL), + mHostName(host), + mCanonicalName(), + mFromTRR(aTRR), + mAddresses(std::move(addresses)) {} + +// deep copy constructor +AddrInfo::AddrInfo(const AddrInfo* src) { + mHostName = src->mHostName; + mCanonicalName = src->mCanonicalName; + ttl = src->ttl; + mFromTRR = src->mFromTRR; + 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 |