gecko-dev/netwerk/dns/DNS.cpp

216 lines
5.9 KiB
C++

/* 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 <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) || defined(XP_OS2)
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) || defined(XP_OS2)
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) || defined(XP_OS2)
else if (addr->raw.family == AF_LOCAL) {
if (bufSize < sizeof(addr->local.path)) {
return false;
}
memcpy(buf, addr->local.path, bufSize);
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;
}
NetAddrElement::NetAddrElement(const PRNetAddr *prNetAddr)
{
PRNetAddrToNetAddr(prNetAddr, &mAddress);
}
NetAddrElement::~NetAddrElement()
{
}
AddrInfo::AddrInfo(const char *host, const PRAddrInfo *prAddrInfo,
bool disableIPv4, const char *cname)
{
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;
}
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()
{
NetAddrElement *addrElement;
while ((addrElement = mAddresses.popLast())) {
delete addrElement;
}
moz_free(mHostName);
moz_free(mCanonicalName);
}
} // namespace dns
} // namespace mozilla