The Tor Browser: netwerk/dns/DNS.h@ca08bd8f51b2 (annotated)

netwerk/dns/DNS.h@ca08bd8f51b2 (annotated)

netwerk/dns/DNS.h

Wed, 31 Dec 2014 06:55:46 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:46 +0100
changeset 1: ca08bd8f51b2
permissions: -rw-r--r--

Added tag TORBROWSER_REPLICA for changeset 6474c204b198

 /* -*- 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
 #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)
   struct {                          /* Unix domain socket address */
     uint16_t family;                /* address family (AF_UNIX) */
     char path[104];                 /* null-terminated pathname */
   } local;
 #endif
   // introduced to support nsTArray<NetAddr> (for DNSRequestParent.cpp)
   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:
   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,
            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;
   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_

The Tor Browser / annotate

netwerk/dns/DNS.h@ca08bd8f51b2 (annotated)

netwerk/dns/DNS.h