зеркало из https://github.com/mozilla/gecko-dev.git
337 строки
9.3 KiB
C++
337 строки
9.3 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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#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 <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, socklen_t size)
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{
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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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}
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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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{
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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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}
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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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{
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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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}
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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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#endif
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}
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bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize)
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{
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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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else 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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{
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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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else 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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} else if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
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IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == 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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{
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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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}
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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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} else 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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{
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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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{
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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
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GetPort(const NetAddr *aAddr, uint16_t *aResult)
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{
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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
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NetAddr::operator == (const NetAddr& other) const
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{
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if (this->raw.family != other.raw.family) {
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return false;
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} else 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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} else 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,
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sizeof(this->inet6.ip)) == 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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} else 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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NetAddrElement::NetAddrElement(const PRNetAddr *prNetAddr)
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{
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PRNetAddrToNetAddr(prNetAddr, &mAddress);
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}
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NetAddrElement::NetAddrElement(const NetAddrElement& netAddr)
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{
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mAddress = netAddr.mAddress;
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}
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NetAddrElement::~NetAddrElement()
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{
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}
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AddrInfo::AddrInfo(const char *host, const PRAddrInfo *prAddrInfo,
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bool disableIPv4, bool filterNameCollision, const char *cname)
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{
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MOZ_ASSERT(prAddrInfo, "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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Init(host, cname);
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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 &&
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(!disableIPv4 || tmpAddr.raw.family != PR_AF_INET) &&
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(!filterNameCollision || tmpAddr.raw.family != PR_AF_INET || (tmpAddr.inet.ip != nameCollisionAddr));
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if (addIt) {
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NetAddrElement *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 char *host, const char *cname)
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{
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Init(host, cname);
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}
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AddrInfo::~AddrInfo()
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{
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NetAddrElement *addrElement;
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while ((addrElement = mAddresses.popLast())) {
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delete addrElement;
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}
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free(mHostName);
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free(mCanonicalName);
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}
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void
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AddrInfo::Init(const char *host, const char *cname)
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{
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MOZ_ASSERT(host, "Cannot initialize AddrInfo with a null host pointer!");
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ttl = NO_TTL_DATA;
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size_t hostlen = strlen(host);
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mHostName = static_cast<char*>(moz_xmalloc(hostlen + 1));
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memcpy(mHostName, host, hostlen + 1);
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if (cname) {
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size_t cnameLen = strlen(cname);
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mCanonicalName = static_cast<char*>(moz_xmalloc(cnameLen + 1));
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memcpy(mCanonicalName, cname, cnameLen + 1);
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}
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else {
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mCanonicalName = nullptr;
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}
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}
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void
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AddrInfo::AddAddress(NetAddrElement *address)
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{
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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
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AddrInfo::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const
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{
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size_t n = mallocSizeOf(this);
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n += mallocSizeOf(mHostName);
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n += mallocSizeOf(mCanonicalName);
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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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