netwerk/dns/DNS.h@ca08bd8f51b2
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
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #ifndef DNS_h_
8 #define DNS_h_
10 #include "nscore.h"
11 #include "prio.h"
12 #include "prnetdb.h"
13 #include "plstr.h"
14 #include "mozilla/LinkedList.h"
15 #include "mozilla/MemoryReporting.h"
17 #if !defined(XP_WIN)
18 #include <arpa/inet.h>
19 #endif
21 #ifdef XP_WIN
22 #include "winsock2.h"
23 #endif
25 #define IPv6ADDR_IS_LOOPBACK(a) \
26 (((a)->u32[0] == 0) && \
27 ((a)->u32[1] == 0) && \
28 ((a)->u32[2] == 0) && \
29 ((a)->u8[12] == 0) && \
30 ((a)->u8[13] == 0) && \
31 ((a)->u8[14] == 0) && \
32 ((a)->u8[15] == 0x1U))
34 #define IPv6ADDR_IS_V4MAPPED(a) \
35 (((a)->u32[0] == 0) && \
36 ((a)->u32[1] == 0) && \
37 ((a)->u8[8] == 0) && \
38 ((a)->u8[9] == 0) && \
39 ((a)->u8[10] == 0xff) && \
40 ((a)->u8[11] == 0xff))
42 #define IPv6ADDR_V4MAPPED_TO_IPADDR(a) ((a)->u32[3])
44 #define IPv6ADDR_IS_UNSPECIFIED(a) \
45 (((a)->u32[0] == 0) && \
46 ((a)->u32[1] == 0) && \
47 ((a)->u32[2] == 0) && \
48 ((a)->u32[3] == 0))
50 namespace mozilla {
51 namespace net {
53 // Required buffer size for text form of an IP address.
54 // Includes space for null termination. We make our own contants
55 // because we don't want higher-level code depending on things
56 // like INET6_ADDRSTRLEN and having to include the associated
57 // platform-specific headers.
58 #ifdef XP_WIN
59 // Windows requires longer buffers for some reason.
60 const int kIPv4CStrBufSize = 22;
61 const int kIPv6CStrBufSize = 65;
62 const int kNetAddrMaxCStrBufSize = kIPv6CStrBufSize;
63 #else
64 const int kIPv4CStrBufSize = 16;
65 const int kIPv6CStrBufSize = 46;
66 const int kLocalCStrBufSize = 108;
67 const int kNetAddrMaxCStrBufSize = kLocalCStrBufSize;
68 #endif
70 // This was all created at a time in which we were using NSPR for host
71 // resolution and we were propagating NSPR types like "PRAddrInfo" and
72 // "PRNetAddr" all over Gecko. This made it hard to use another host
73 // resolver -- we were locked into NSPR. The goal here is to get away
74 // from that. We'll translate what we get from NSPR or any other host
75 // resolution library into the types below and use them in Gecko.
77 union IPv6Addr {
78 uint8_t u8[16];
79 uint16_t u16[8];
80 uint32_t u32[4];
81 uint64_t u64[2];
82 };
84 // This struct is similar to operating system structs like "sockaddr", used for
85 // things like "connect" and "getsockname". When tempted to cast or do dumb
86 // copies of this struct to another struct, bear compiler-computed padding
87 // in mind. The size of this struct, and the layout of the data in it, may
88 // not be what you expect.
89 union NetAddr {
90 struct {
91 uint16_t family; /* address family (0x00ff maskable) */
92 char data[14]; /* raw address data */
93 } raw;
94 struct {
95 uint16_t family; /* address family (AF_INET) */
96 uint16_t port; /* port number */
97 uint32_t ip; /* The actual 32 bits of address */
98 } inet;
99 struct {
100 uint16_t family; /* address family (AF_INET6) */
101 uint16_t port; /* port number */
102 uint32_t flowinfo; /* routing information */
103 IPv6Addr ip; /* the actual 128 bits of address */
104 uint32_t scope_id; /* set of interfaces for a scope */
105 } inet6;
106 #if defined(XP_UNIX)
107 struct { /* Unix domain socket address */
108 uint16_t family; /* address family (AF_UNIX) */
109 char path[104]; /* null-terminated pathname */
110 } local;
111 #endif
112 // introduced to support nsTArray<NetAddr> (for DNSRequestParent.cpp)
113 bool operator == (const NetAddr& other) const;
114 };
116 // This class wraps a NetAddr union to provide C++ linked list
117 // capabilities and other methods. It is created from a PRNetAddr,
118 // which is converted to a mozilla::dns::NetAddr.
119 class NetAddrElement : public LinkedListElement<NetAddrElement> {
120 public:
121 NetAddrElement(const PRNetAddr *prNetAddr);
122 NetAddrElement(const NetAddrElement& netAddr);
123 ~NetAddrElement();
125 NetAddr mAddress;
126 };
128 class AddrInfo {
129 public:
130 // Creates an AddrInfo object. It calls the AddrInfo(const char*, const char*)
131 // to initialize the host and the cname.
132 AddrInfo(const char *host, const PRAddrInfo *prAddrInfo, bool disableIPv4,
133 const char *cname);
135 // Creates a basic AddrInfo object (initialize only the host and the cname).
136 AddrInfo(const char *host, const char *cname);
137 ~AddrInfo();
139 void AddAddress(NetAddrElement *address);
141 size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
143 char *mHostName;
144 char *mCanonicalName;
145 LinkedList<NetAddrElement> mAddresses;
147 private:
148 void Init(const char *host, const char *cname);
149 };
151 // Copies the contents of a PRNetAddr to a NetAddr.
152 // Does not do a ptr safety check!
153 void PRNetAddrToNetAddr(const PRNetAddr *prAddr, NetAddr *addr);
155 // Copies the contents of a NetAddr to a PRNetAddr.
156 // Does not do a ptr safety check!
157 void NetAddrToPRNetAddr(const NetAddr *addr, PRNetAddr *prAddr);
159 bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize);
161 bool IsLoopBackAddress(const NetAddr *addr);
163 bool IsIPAddrAny(const NetAddr *addr);
165 bool IsIPAddrV4Mapped(const NetAddr *addr);
167 bool IsIPAddrLocal(const NetAddr *addr);
169 nsresult GetPort(const NetAddr *aAddr, uint16_t *aResult);
171 } // namespace net
172 } // namespace mozilla
174 #endif // DNS_h_
