зеркало из https://github.com/mozilla/gecko-dev.git
350 строки
10 KiB
C++
350 строки
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=4 sw=2 sts=2 et cin: */
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/* 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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#include "mozilla/net/DNS.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/mozalloc.h"
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#include "mozilla/ArrayUtils.h"
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#include "nsString.h"
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#include <string.h>
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#ifdef XP_WIN
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# include "ws2tcpip.h"
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#endif
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namespace mozilla {
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namespace net {
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const char *inet_ntop_internal(int af, const void *src, char *dst,
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socklen_t size) {
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#ifdef XP_WIN
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if (af == AF_INET) {
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struct sockaddr_in s;
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memset(&s, 0, sizeof(s));
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s.sin_family = AF_INET;
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memcpy(&s.sin_addr, src, sizeof(struct in_addr));
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int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in),
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dst, size, nullptr, 0, NI_NUMERICHOST);
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if (result == 0) {
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return dst;
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}
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} else if (af == AF_INET6) {
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struct sockaddr_in6 s;
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memset(&s, 0, sizeof(s));
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s.sin6_family = AF_INET6;
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memcpy(&s.sin6_addr, src, sizeof(struct in_addr6));
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int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in6),
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dst, size, nullptr, 0, NI_NUMERICHOST);
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if (result == 0) {
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return dst;
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}
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}
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return nullptr;
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#else
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return inet_ntop(af, src, dst, size);
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#endif
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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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if (prAddr->raw.family == PR_AF_INET) {
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addr->inet.family = AF_INET;
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addr->inet.port = prAddr->inet.port;
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addr->inet.ip = prAddr->inet.ip;
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} else if (prAddr->raw.family == PR_AF_INET6) {
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addr->inet6.family = AF_INET6;
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addr->inet6.port = prAddr->ipv6.port;
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addr->inet6.flowinfo = prAddr->ipv6.flowinfo;
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memcpy(&addr->inet6.ip, &prAddr->ipv6.ip, sizeof(addr->inet6.ip.u8));
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addr->inet6.scope_id = prAddr->ipv6.scope_id;
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}
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#if defined(XP_UNIX)
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else if (prAddr->raw.family == PR_AF_LOCAL) {
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addr->local.family = AF_LOCAL;
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memcpy(addr->local.path, prAddr->local.path, sizeof(addr->local.path));
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}
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#endif
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}
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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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if (addr->raw.family == AF_INET) {
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prAddr->inet.family = PR_AF_INET;
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prAddr->inet.port = addr->inet.port;
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prAddr->inet.ip = addr->inet.ip;
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} else if (addr->raw.family == AF_INET6) {
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prAddr->ipv6.family = PR_AF_INET6;
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prAddr->ipv6.port = addr->inet6.port;
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prAddr->ipv6.flowinfo = addr->inet6.flowinfo;
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memcpy(&prAddr->ipv6.ip, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
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prAddr->ipv6.scope_id = addr->inet6.scope_id;
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}
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#if defined(XP_UNIX)
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else if (addr->raw.family == AF_LOCAL) {
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prAddr->local.family = PR_AF_LOCAL;
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memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path));
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}
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#elif defined(XP_WIN)
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else if (addr->raw.family == AF_LOCAL) {
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prAddr->local.family = PR_AF_LOCAL;
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memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path));
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}
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#endif
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}
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bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize) {
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if (addr->raw.family == AF_INET) {
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if (bufSize < INET_ADDRSTRLEN) {
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return false;
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}
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struct in_addr nativeAddr = {};
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nativeAddr.s_addr = addr->inet.ip;
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return !!inet_ntop_internal(AF_INET, &nativeAddr, buf, bufSize);
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}
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if (addr->raw.family == AF_INET6) {
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if (bufSize < INET6_ADDRSTRLEN) {
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return false;
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}
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struct in6_addr nativeAddr = {};
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memcpy(&nativeAddr.s6_addr, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
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return !!inet_ntop_internal(AF_INET6, &nativeAddr, buf, bufSize);
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}
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#if defined(XP_UNIX)
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else if (addr->raw.family == AF_LOCAL) {
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if (bufSize < sizeof(addr->local.path)) {
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// Many callers don't bother checking our return value, so
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// null-terminate just in case.
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if (bufSize > 0) {
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buf[0] = '\0';
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}
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return false;
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}
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// Usually, the size passed to memcpy should be the size of the
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// destination. Here, we know that the source is no larger than the
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// destination, so using the source's size is always safe, whereas
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// using the destination's size may cause us to read off the end of the
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// source.
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memcpy(buf, addr->local.path, sizeof(addr->local.path));
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return true;
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}
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#endif
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return false;
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}
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bool IsLoopBackAddress(const NetAddr *addr) {
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if (addr->raw.family == AF_INET) {
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return (addr->inet.ip == htonl(INADDR_LOOPBACK));
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}
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if (addr->raw.family == AF_INET6) {
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if (IPv6ADDR_IS_LOOPBACK(&addr->inet6.ip)) {
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return true;
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}
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if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
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IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) ==
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htonl(INADDR_LOOPBACK)) {
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return true;
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}
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}
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return false;
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}
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bool IsIPAddrAny(const NetAddr *addr) {
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if (addr->raw.family == AF_INET) {
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if (addr->inet.ip == htonl(INADDR_ANY)) {
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return true;
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}
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} else if (addr->raw.family == AF_INET6) {
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if (IPv6ADDR_IS_UNSPECIFIED(&addr->inet6.ip)) {
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return true;
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}
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if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
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IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_ANY)) {
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return true;
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}
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}
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return false;
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}
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bool IsIPAddrV4Mapped(const NetAddr *addr) {
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if (addr->raw.family == AF_INET6) {
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return IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip);
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}
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return false;
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}
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bool IsIPAddrLocal(const NetAddr *addr) {
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MOZ_ASSERT(addr);
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// IPv4 RFC1918 and Link Local Addresses.
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if (addr->raw.family == AF_INET) {
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uint32_t addr32 = ntohl(addr->inet.ip);
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if (addr32 >> 24 == 0x0A || // 10/8 prefix (RFC 1918).
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addr32 >> 20 == 0xAC1 || // 172.16/12 prefix (RFC 1918).
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addr32 >> 16 == 0xC0A8 || // 192.168/16 prefix (RFC 1918).
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addr32 >> 16 == 0xA9FE) { // 169.254/16 prefix (Link Local).
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return true;
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}
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}
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// IPv6 Unique and Link Local Addresses.
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if (addr->raw.family == AF_INET6) {
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uint16_t addr16 = ntohs(addr->inet6.ip.u16[0]);
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if (addr16 >> 9 == 0xfc >> 1 || // fc00::/7 Unique Local Address.
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addr16 >> 6 == 0xfe80 >> 6) { // fe80::/10 Link Local Address.
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return true;
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}
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}
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// Not an IPv4/6 local address.
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return false;
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}
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nsresult GetPort(const NetAddr *aAddr, uint16_t *aResult) {
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uint16_t port;
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if (aAddr->raw.family == PR_AF_INET) {
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port = aAddr->inet.port;
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} else if (aAddr->raw.family == PR_AF_INET6) {
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port = aAddr->inet6.port;
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} else {
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return NS_ERROR_NOT_INITIALIZED;
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}
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*aResult = ntohs(port);
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return NS_OK;
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}
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bool NetAddr::operator==(const NetAddr &other) const {
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if (this->raw.family != other.raw.family) {
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return false;
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}
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if (this->raw.family == AF_INET) {
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return (this->inet.port == other.inet.port) &&
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(this->inet.ip == other.inet.ip);
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}
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if (this->raw.family == AF_INET6) {
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return (this->inet6.port == other.inet6.port) &&
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(this->inet6.flowinfo == other.inet6.flowinfo) &&
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(memcmp(&this->inet6.ip, &other.inet6.ip, sizeof(this->inet6.ip)) ==
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0) &&
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(this->inet6.scope_id == other.inet6.scope_id);
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#if defined(XP_UNIX)
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}
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if (this->raw.family == AF_LOCAL) {
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return PL_strncmp(this->local.path, other.local.path,
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ArrayLength(this->local.path));
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#endif
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}
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return false;
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}
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bool NetAddr::operator<(const NetAddr &other) const {
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if (this->raw.family != other.raw.family) {
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return this->raw.family < other.raw.family;
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}
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if (this->raw.family == AF_INET) {
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if (this->inet.ip == other.inet.ip) {
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return this->inet.port < other.inet.port;
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}
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return this->inet.ip < other.inet.ip;
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}
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if (this->raw.family == AF_INET6) {
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int cmpResult =
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memcmp(&this->inet6.ip, &other.inet6.ip, sizeof(this->inet6.ip));
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if (cmpResult) {
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return cmpResult < 0;
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}
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if (this->inet6.port != other.inet6.port) {
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return this->inet6.port < other.inet6.port;
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}
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return this->inet6.flowinfo < other.inet6.flowinfo;
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}
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return false;
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}
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NetAddrElement::NetAddrElement(const PRNetAddr *prNetAddr) {
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this->mAddress.raw.family = 0;
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this->mAddress.inet = {};
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PRNetAddrToNetAddr(prNetAddr, &mAddress);
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}
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NetAddrElement::NetAddrElement(const NetAddrElement &netAddr) {
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mAddress = netAddr.mAddress;
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}
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NetAddrElement::~NetAddrElement() = default;
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AddrInfo::AddrInfo(const nsACString &host, const PRAddrInfo *prAddrInfo,
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bool disableIPv4, bool filterNameCollision,
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const nsACString &cname)
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: mHostName(host),
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mCanonicalName(cname),
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ttl(NO_TTL_DATA),
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mFromTRR(false) {
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MOZ_ASSERT(prAddrInfo,
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"Cannot construct AddrInfo with a null prAddrInfo pointer!");
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const uint32_t nameCollisionAddr = htonl(0x7f003535); // 127.0.53.53
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PRNetAddr tmpAddr;
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void *iter = nullptr;
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do {
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iter = PR_EnumerateAddrInfo(iter, prAddrInfo, 0, &tmpAddr);
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bool addIt = iter && (!disableIPv4 || tmpAddr.raw.family != PR_AF_INET) &&
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(!filterNameCollision || tmpAddr.raw.family != PR_AF_INET ||
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(tmpAddr.inet.ip != nameCollisionAddr));
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if (addIt) {
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auto *addrElement = new NetAddrElement(&tmpAddr);
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mAddresses.insertBack(addrElement);
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}
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} while (iter);
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}
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AddrInfo::AddrInfo(const nsACString &host, const nsACString &cname,
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unsigned int aTRR)
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: mHostName(host),
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mCanonicalName(cname),
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ttl(NO_TTL_DATA),
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mFromTRR(aTRR) {}
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AddrInfo::AddrInfo(const nsACString &host, unsigned int aTRR)
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: mHostName(host),
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mCanonicalName(EmptyCString()),
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ttl(NO_TTL_DATA),
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mFromTRR(aTRR) {}
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// deep copy constructor
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AddrInfo::AddrInfo(const AddrInfo *src) {
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mHostName = src->mHostName;
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mCanonicalName = src->mCanonicalName;
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ttl = src->ttl;
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mFromTRR = src->mFromTRR;
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for (auto element = src->mAddresses.getFirst(); element;
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element = element->getNext()) {
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AddAddress(new NetAddrElement(*element));
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}
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}
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AddrInfo::~AddrInfo() {}
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void AddrInfo::AddAddress(NetAddrElement *address) {
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MOZ_ASSERT(address, "Cannot add the address to an uninitialized list");
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mAddresses.insertBack(address);
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}
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size_t AddrInfo::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const {
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size_t n = mallocSizeOf(this);
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n += mHostName.SizeOfExcludingThisIfUnshared(mallocSizeOf);
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n += mCanonicalName.SizeOfExcludingThisIfUnshared(mallocSizeOf);
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n += mAddresses.sizeOfExcludingThis(mallocSizeOf);
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return n;
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}
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} // namespace net
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} // namespace mozilla
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