mirror of
https://github.com/mozilla/gecko-dev.git
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153 lines
4.7 KiB
C++
153 lines
4.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DNS_h_
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#define DNS_h_
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#include "nscore.h"
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#include "prio.h"
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#include "prnetdb.h"
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#include "mozilla/LinkedList.h"
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#if !defined(XP_WIN) && !defined(XP_OS2)
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#include <arpa/inet.h>
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#endif
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#ifdef XP_WIN
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#include "winsock2.h"
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#endif
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#define IPv6ADDR_IS_LOOPBACK(a) \
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(((a)->u32[0] == 0) && \
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((a)->u32[1] == 0) && \
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((a)->u32[2] == 0) && \
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((a)->u8[12] == 0) && \
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((a)->u8[13] == 0) && \
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((a)->u8[14] == 0) && \
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((a)->u8[15] == 0x1U))
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#define IPv6ADDR_IS_V4MAPPED(a) \
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(((a)->u32[0] == 0) && \
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((a)->u32[1] == 0) && \
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((a)->u8[8] == 0) && \
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((a)->u8[9] == 0) && \
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((a)->u8[10] == 0xff) && \
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((a)->u8[11] == 0xff))
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#define IPv6ADDR_V4MAPPED_TO_IPADDR(a) ((a)->u32[3])
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#define IPv6ADDR_IS_UNSPECIFIED(a) \
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(((a)->u32[0] == 0) && \
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((a)->u32[1] == 0) && \
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((a)->u32[2] == 0) && \
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((a)->u32[3] == 0))
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namespace mozilla {
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namespace net {
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// Required buffer size for text form of an IP address.
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// Includes space for null termination. We make our own contants
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// because we don't want higher-level code depending on things
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// like INET6_ADDRSTRLEN and having to include the associated
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// platform-specific headers.
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#ifdef XP_WIN
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// Windows requires longer buffers for some reason.
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const int kIPv4CStrBufSize = 22;
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const int kIPv6CStrBufSize = 65;
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#else
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const int kIPv4CStrBufSize = 16;
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const int kIPv6CStrBufSize = 46;
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#endif
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// This was all created at a time in which we were using NSPR for host
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// resolution and we were propagating NSPR types like "PRAddrInfo" and
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// "PRNetAddr" all over Gecko. This made it hard to use another host
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// resolver -- we were locked into NSPR. The goal here is to get away
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// from that. We'll translate what we get from NSPR or any other host
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// resolution library into the types below and use them in Gecko.
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union IPv6Addr {
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uint8_t u8[16];
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uint16_t u16[8];
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uint32_t u32[4];
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uint64_t u64[2];
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};
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// This struct is similar to operating system structs like "sockaddr", used for
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// things like "connect" and "getsockname". When tempted to cast or do dumb
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// copies of this struct to another struct, bear compiler-computed padding
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// in mind. The size of this struct, and the layout of the data in it, may
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// not be what you expect.
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union NetAddr {
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struct {
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uint16_t family; /* address family (0x00ff maskable) */
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char data[14]; /* raw address data */
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} raw;
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struct {
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uint16_t family; /* address family (AF_INET) */
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uint16_t port; /* port number */
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uint32_t ip; /* The actual 32 bits of address */
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} inet;
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struct {
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uint16_t family; /* address family (AF_INET6) */
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uint16_t port; /* port number */
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uint32_t flowinfo; /* routing information */
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IPv6Addr ip; /* the actual 128 bits of address */
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uint32_t scope_id; /* set of interfaces for a scope */
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} inet6;
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#if defined(XP_UNIX) || defined(XP_OS2)
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struct { /* Unix domain socket address */
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uint16_t family; /* address family (AF_UNIX) */
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#ifdef XP_OS2
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char path[108]; /* null-terminated pathname */
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#else
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char path[104]; /* null-terminated pathname */
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#endif
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} local;
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#endif
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};
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// This class wraps a NetAddr union to provide C++ linked list
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// capabilities and other methods. It is created from a PRNetAddr,
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// which is converted to a mozilla::dns::NetAddr.
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class NetAddrElement : public LinkedListElement<NetAddrElement> {
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public:
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NetAddrElement(const PRNetAddr *prNetAddr);
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~NetAddrElement();
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NetAddr mAddress;
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};
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class AddrInfo {
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public:
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AddrInfo(const char *host, const PRAddrInfo *prAddrInfo, bool disableIPv4,
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const char *cname);
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~AddrInfo();
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char *mHostName;
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char *mCanonicalName;
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LinkedList<NetAddrElement> mAddresses;
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};
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// Copies the contents of a PRNetAddr to a NetAddr.
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// Does not do a ptr safety check!
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void PRNetAddrToNetAddr(const PRNetAddr *prAddr, NetAddr *addr);
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// Copies the contents of a NetAddr to a PRNetAddr.
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// Does not do a ptr safety check!
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void NetAddrToPRNetAddr(const NetAddr *addr, PRNetAddr *prAddr);
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bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize);
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bool IsLoopBackAddress(const NetAddr *addr);
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bool IsIPAddrAny(const NetAddr *addr);
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bool IsIPAddrV4Mapped(const NetAddr *addr);
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} // namespace net
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} // namespace mozilla
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#endif // DNS_h_
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