The Tor Browser: comparison netwerk/dns/DNS.cpp

--1:000000000000
+:b8f6b54b36b4
+/* 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/. */
+#include "mozilla/net/DNS.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/mozalloc.h"
+#include "mozilla/ArrayUtils.h"
+#include <string.h>
+#ifdef XP_WIN
+#include "ws2tcpip.h"
+#endif
+namespace mozilla {
+namespace net {
+const char *inet_ntop_internal(int af, const void *src, char *dst, socklen_t size)
+{
+#ifdef XP_WIN
+if (af == AF_INET) {
+struct sockaddr_in s;
+memset(&s, 0, sizeof(s));
+s.sin_family = AF_INET;
+memcpy(&s.sin_addr, src, sizeof(struct in_addr));
+int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in),
+dst, size, nullptr, 0, NI_NUMERICHOST);
+if (result == 0) {
+return dst;
+}
+}
+else if (af == AF_INET6) {
+struct sockaddr_in6 s;
+memset(&s, 0, sizeof(s));
+s.sin6_family = AF_INET6;
+memcpy(&s.sin6_addr, src, sizeof(struct in_addr6));
+int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in6),
+dst, size, nullptr, 0, NI_NUMERICHOST);
+if (result == 0) {
+return dst;
+}
+}
+return nullptr;
+#else
+return inet_ntop(af, src, dst, size);
+#endif
+}
+// Copies the contents of a PRNetAddr to a NetAddr.
+// Does not do a ptr safety check!
+void PRNetAddrToNetAddr(const PRNetAddr *prAddr, NetAddr *addr)
+{
+if (prAddr->raw.family == PR_AF_INET) {
+addr->inet.family = AF_INET;
+addr->inet.port = prAddr->inet.port;
+addr->inet.ip = prAddr->inet.ip;
+}
+else if (prAddr->raw.family == PR_AF_INET6) {
+addr->inet6.family = AF_INET6;
+addr->inet6.port = prAddr->ipv6.port;
+addr->inet6.flowinfo = prAddr->ipv6.flowinfo;
+memcpy(&addr->inet6.ip, &prAddr->ipv6.ip, sizeof(addr->inet6.ip.u8));
+addr->inet6.scope_id = prAddr->ipv6.scope_id;
+}
+#if defined(XP_UNIX)
+else if (prAddr->raw.family == PR_AF_LOCAL) {
+addr->local.family = AF_LOCAL;
+memcpy(addr->local.path, prAddr->local.path, sizeof(addr->local.path));
+}
+#endif
+}
+// Copies the contents of a NetAddr to a PRNetAddr.
+// Does not do a ptr safety check!
+void NetAddrToPRNetAddr(const NetAddr *addr, PRNetAddr *prAddr)
+{
+if (addr->raw.family == AF_INET) {
+prAddr->inet.family = PR_AF_INET;
+prAddr->inet.port = addr->inet.port;
+prAddr->inet.ip = addr->inet.ip;
+}
+else if (addr->raw.family == AF_INET6) {
+prAddr->ipv6.family = PR_AF_INET6;
+prAddr->ipv6.port = addr->inet6.port;
+prAddr->ipv6.flowinfo = addr->inet6.flowinfo;
+memcpy(&prAddr->ipv6.ip, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
+prAddr->ipv6.scope_id = addr->inet6.scope_id;
+}
+#if defined(XP_UNIX)
+else if (addr->raw.family == AF_LOCAL) {
+prAddr->local.family = PR_AF_LOCAL;
+memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path));
+}
+#endif
+}
+bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize)
+{
+if (addr->raw.family == AF_INET) {
+if (bufSize < INET_ADDRSTRLEN) {
+return false;
+}
+struct in_addr nativeAddr = {};
+nativeAddr.s_addr = addr->inet.ip;
+return !!inet_ntop_internal(AF_INET, &nativeAddr, buf, bufSize);
+}
+else if (addr->raw.family == AF_INET6) {
+if (bufSize < INET6_ADDRSTRLEN) {
+return false;
+}
+struct in6_addr nativeAddr = {};
+memcpy(&nativeAddr.s6_addr, &addr->inet6.ip, sizeof(addr->inet6.ip.u8));
+return !!inet_ntop_internal(AF_INET6, &nativeAddr, buf, bufSize);
+}
+#if defined(XP_UNIX)
+else if (addr->raw.family == AF_LOCAL) {
+if (bufSize < sizeof(addr->local.path)) {
+// Many callers don't bother checking our return value, so
+// null-terminate just in case.
+if (bufSize > 0) {
+buf[0] = '\0';
+}
+return false;
+}
+// Usually, the size passed to memcpy should be the size of the
+// destination. Here, we know that the source is no larger than the
+// destination, so using the source's size is always safe, whereas
+// using the destination's size may cause us to read off the end of the
+// source.
+memcpy(buf, addr->local.path, sizeof(addr->local.path));
+return true;
+}
+#endif
+return false;
+}
+bool IsLoopBackAddress(const NetAddr *addr)
+{
+if (addr->raw.family == AF_INET) {
+return (addr->inet.ip == htonl(INADDR_LOOPBACK));
+}
+else if (addr->raw.family == AF_INET6) {
+if (IPv6ADDR_IS_LOOPBACK(&addr->inet6.ip)) {
+return true;
+} else if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
+IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_LOOPBACK)) {
+return true;
+}
+}
+return false;
+}
+bool IsIPAddrAny(const NetAddr *addr)
+{
+if (addr->raw.family == AF_INET) {
+if (addr->inet.ip == htonl(INADDR_ANY)) {
+return true;
+}
+}
+else if (addr->raw.family == AF_INET6) {
+if (IPv6ADDR_IS_UNSPECIFIED(&addr->inet6.ip)) {
+return true;
+} else if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) &&
+IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_ANY)) {
+return true;
+}
+}
+return false;
+}
+bool IsIPAddrV4Mapped(const NetAddr *addr)
+{
+if (addr->raw.family == AF_INET6) {
+return IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip);
+}
+return false;
+}
+bool IsIPAddrLocal(const NetAddr *addr)
+{
+MOZ_ASSERT(addr);
+// IPv4 RFC1918 and Link Local Addresses.
+if (addr->raw.family == AF_INET) {
+uint32_t addr32 = ntohl(addr->inet.ip);
+if (addr32 >> 24 == 0x0A ||    // 10/8 prefix (RFC 1918).
+addr32 >> 20 == 0xAC1 ||   // 172.16/12 prefix (RFC 1918).
+addr32 >> 16 == 0xC0A8 ||  // 192.168/16 prefix (RFC 1918).
+addr32 >> 16 == 0xA9FE) {  // 169.254/16 prefix (Link Local).
+return true;
+}
+}
+// IPv6 Unique and Link Local Addresses.
+if (addr->raw.family == AF_INET6) {
+uint16_t addr16 = ntohs(addr->inet6.ip.u16[0]);
+if (addr16 >> 9 == 0xfc >> 1 ||   // fc00::/7 Unique Local Address.
+addr16 >> 6 == 0xfe80 >> 6) { // fe80::/10 Link Local Address.
+return true;
+}
+}
+// Not an IPv4/6 local address.
+return false;
+}
+nsresult
+GetPort(const NetAddr *aAddr, uint16_t *aResult)
+{
+uint16_t port;
+if (aAddr->raw.family == PR_AF_INET) {
+port = aAddr->inet.port;
+} else if (aAddr->raw.family == PR_AF_INET6) {
+port = aAddr->inet6.port;
+} else {
+return NS_ERROR_NOT_INITIALIZED;
+}
+*aResult = ntohs(port);
+return NS_OK;
+}
+bool
+NetAddr::operator == (const NetAddr& other) const
+{
+if (this->raw.family != other.raw.family) {
+return false;
+} else if (this->raw.family == AF_INET) {
+return (this->inet.port == other.inet.port) &&
+(this->inet.ip == other.inet.ip);
+} else if (this->raw.family == AF_INET6) {
+return (this->inet6.port == other.inet6.port) &&
+(this->inet6.flowinfo == other.inet6.flowinfo) &&
+(memcmp(&this->inet6.ip, &other.inet6.ip,
+sizeof(this->inet6.ip)) == 0) &&
+(this->inet6.scope_id == other.inet6.scope_id);
+#if defined(XP_UNIX)
+} else if (this->raw.family == AF_LOCAL) {
+return PL_strncmp(this->local.path, other.local.path,
+ArrayLength(this->local.path));
+#endif
+}
+return false;
+}
+NetAddrElement::NetAddrElement(const PRNetAddr *prNetAddr)
+{
+PRNetAddrToNetAddr(prNetAddr, &mAddress);
+}
+NetAddrElement::NetAddrElement(const NetAddrElement& netAddr)
+{
+mAddress = netAddr.mAddress;
+}
+NetAddrElement::~NetAddrElement()
+{
+}
+AddrInfo::AddrInfo(const char *host, const PRAddrInfo *prAddrInfo,
+bool disableIPv4, const char *cname)
+{
+MOZ_ASSERT(prAddrInfo, "Cannot construct AddrInfo with a null prAddrInfo pointer!");
+Init(host, cname);
+PRNetAddr tmpAddr;
+void *iter = nullptr;
+do {
+iter = PR_EnumerateAddrInfo(iter, prAddrInfo, 0, &tmpAddr);
+if (iter && (!disableIPv4 || tmpAddr.raw.family != PR_AF_INET)) {
+NetAddrElement *addrElement = new NetAddrElement(&tmpAddr);
+mAddresses.insertBack(addrElement);
+}
+} while (iter);
+}
+AddrInfo::AddrInfo(const char *host, const char *cname)
+{
+Init(host, cname);
+}
+AddrInfo::~AddrInfo()
+{
+NetAddrElement *addrElement;
+while ((addrElement = mAddresses.popLast())) {
+delete addrElement;
+}
+moz_free(mHostName);
+moz_free(mCanonicalName);
+}
+void
+AddrInfo::Init(const char *host, const char *cname)
+{
+MOZ_ASSERT(host, "Cannot initialize AddrInfo with a null host pointer!");
+size_t hostlen = strlen(host);
+mHostName = static_cast<char*>(moz_xmalloc(hostlen + 1));
+memcpy(mHostName, host, hostlen + 1);
+if (cname) {
+size_t cnameLen = strlen(cname);
+mCanonicalName = static_cast<char*>(moz_xmalloc(cnameLen + 1));
+memcpy(mCanonicalName, cname, cnameLen + 1);
+}
+else {
+mCanonicalName = nullptr;
+}
+}
+void
+AddrInfo::AddAddress(NetAddrElement *address)
+{
+MOZ_ASSERT(address, "Cannot add the address to an uninitialized list");
+mAddresses.insertBack(address);
+}
+size_t
+AddrInfo::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const
+{
+size_t n = mallocSizeOf(this);
+n += mallocSizeOf(mHostName);
+n += mallocSizeOf(mCanonicalName);
+n += mAddresses.sizeOfExcludingThis(mallocSizeOf);
+return n;
+}
+} // namespace dns
+} // namespace mozilla

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comparison: netwerk/dns/DNS.cpp

netwerk/dns/DNS.cpp