/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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/. */ #ifndef DNS_h_ #define DNS_h_ #include "nscore.h" #include "prio.h" #include "prnetdb.h" #include "plstr.h" #include "mozilla/LinkedList.h" #include "mozilla/MemoryReporting.h" #if !defined(XP_WIN) #include <arpa/inet.h> #endif #ifdef XP_WIN #include "winsock2.h" #endif #ifndef AF_LOCAL #define AF_LOCAL 1 // used for named pipe #endif #define IPv6ADDR_IS_LOOPBACK(a) \ (((a)->u32[0] == 0) && \ ((a)->u32[1] == 0) && \ ((a)->u32[2] == 0) && \ ((a)->u8[12] == 0) && \ ((a)->u8[13] == 0) && \ ((a)->u8[14] == 0) && \ ((a)->u8[15] == 0x1U)) #define IPv6ADDR_IS_V4MAPPED(a) \ (((a)->u32[0] == 0) && \ ((a)->u32[1] == 0) && \ ((a)->u8[8] == 0) && \ ((a)->u8[9] == 0) && \ ((a)->u8[10] == 0xff) && \ ((a)->u8[11] == 0xff)) #define IPv6ADDR_V4MAPPED_TO_IPADDR(a) ((a)->u32[3]) #define IPv6ADDR_IS_UNSPECIFIED(a) \ (((a)->u32[0] == 0) && \ ((a)->u32[1] == 0) && \ ((a)->u32[2] == 0) && \ ((a)->u32[3] == 0)) namespace mozilla { namespace net { // Required buffer size for text form of an IP address. // Includes space for null termination. We make our own contants // because we don't want higher-level code depending on things // like INET6_ADDRSTRLEN and having to include the associated // platform-specific headers. #ifdef XP_WIN // Windows requires longer buffers for some reason. const int kIPv4CStrBufSize = 22; const int kIPv6CStrBufSize = 65; const int kNetAddrMaxCStrBufSize = kIPv6CStrBufSize; #else const int kIPv4CStrBufSize = 16; const int kIPv6CStrBufSize = 46; const int kLocalCStrBufSize = 108; const int kNetAddrMaxCStrBufSize = kLocalCStrBufSize; #endif // This was all created at a time in which we were using NSPR for host // resolution and we were propagating NSPR types like "PRAddrInfo" and // "PRNetAddr" all over Gecko. This made it hard to use another host // resolver -- we were locked into NSPR. The goal here is to get away // from that. We'll translate what we get from NSPR or any other host // resolution library into the types below and use them in Gecko. union IPv6Addr { uint8_t u8[16]; uint16_t u16[8]; uint32_t u32[4]; uint64_t u64[2]; }; // This struct is similar to operating system structs like "sockaddr", used for // things like "connect" and "getsockname". When tempted to cast or do dumb // copies of this struct to another struct, bear compiler-computed padding // in mind. The size of this struct, and the layout of the data in it, may // not be what you expect. union NetAddr { struct { uint16_t family; /* address family (0x00ff maskable) */ char data[14]; /* raw address data */ } raw; struct { uint16_t family; /* address family (AF_INET) */ uint16_t port; /* port number */ uint32_t ip; /* The actual 32 bits of address */ } inet; struct { uint16_t family; /* address family (AF_INET6) */ uint16_t port; /* port number */ uint32_t flowinfo; /* routing information */ IPv6Addr ip; /* the actual 128 bits of address */ uint32_t scope_id; /* set of interfaces for a scope */ } inet6; #if defined(XP_UNIX) || defined(XP_WIN) struct { /* Unix domain socket or Windows Named Pipes address */ uint16_t family; /* address family (AF_UNIX) */ char path[104]; /* null-terminated pathname */ } local; #endif // introduced to support nsTArray<NetAddr> comparisons and sorting bool operator == (const NetAddr& other) const; bool operator < (const NetAddr &other) const; }; // This class wraps a NetAddr union to provide C++ linked list // capabilities and other methods. It is created from a PRNetAddr, // which is converted to a mozilla::dns::NetAddr. class NetAddrElement : public LinkedListElement<NetAddrElement> { public: explicit NetAddrElement(const PRNetAddr *prNetAddr); NetAddrElement(const NetAddrElement& netAddr); ~NetAddrElement(); NetAddr mAddress; }; class AddrInfo { public: // Creates an AddrInfo object. It calls the AddrInfo(const char*, const char*) // to initialize the host and the cname. AddrInfo(const char *host, const PRAddrInfo *prAddrInfo, bool disableIPv4, bool filterNameCollision, const char *cname); // Creates a basic AddrInfo object (initialize only the host and the cname). AddrInfo(const char *host, const char *cname); ~AddrInfo(); void AddAddress(NetAddrElement *address); size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const; char *mHostName; char *mCanonicalName; uint16_t ttl; static const uint16_t NO_TTL_DATA = (uint16_t) -1; LinkedList<NetAddrElement> mAddresses; private: void Init(const char *host, const char *cname); }; // Copies the contents of a PRNetAddr to a NetAddr. // Does not do a ptr safety check! void PRNetAddrToNetAddr(const PRNetAddr *prAddr, NetAddr *addr); // Copies the contents of a NetAddr to a PRNetAddr. // Does not do a ptr safety check! void NetAddrToPRNetAddr(const NetAddr *addr, PRNetAddr *prAddr); bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize); bool IsLoopBackAddress(const NetAddr *addr); bool IsIPAddrAny(const NetAddr *addr); bool IsIPAddrV4Mapped(const NetAddr *addr); bool IsIPAddrLocal(const NetAddr *addr); nsresult GetPort(const NetAddr *aAddr, uint16_t *aResult); } // namespace net } // namespace mozilla #endif // DNS_h_