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Added Code to detect Symmetric NAT (BAD!) Firewalls.

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git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@361 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
drbob 2008-02-28 15:58:54 +00:00
parent 6dd3d30d8e
commit 2dc2954f40
14 changed files with 257 additions and 43 deletions
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101
libretroshare/src/tcponudp/udpsorter.cc
View file

@ -39,7 +39,7 @@ static const int STUN_TTL = 64;
#define DEBUG_UDP_SORTER 1
UdpSorter::UdpSorter(struct sockaddr_in &local)
:udpLayer(NULL), laddr(local), eaddrKnown(false),
:udpLayer(NULL), laddr(local), eaddrKnown(false), eaddrStable(false),
mStunKeepAlive(false), mStunLastRecv(0), mStunLastSend(0)
@ -234,10 +234,7 @@ bool UdpSorter::locked_handleStunPkt(void *data, int size, struct sockaddr_in &f
std::cerr << inet_ntoa(eAddr.sin_addr) << ":" << ntohs(eAddr.sin_port);
std::cerr << std::endl;
#endif
eaddrKnown = true;
eaddr = eAddr;
locked_recvdStun(from);
locked_recvdStun(from, eAddr);
return true;
}
@ -251,11 +248,17 @@ bool UdpSorter::locked_handleStunPkt(void *data, int size, struct sockaddr_in &f
}
bool UdpSorter::externalAddr(struct sockaddr_in &external)
bool UdpSorter::externalAddr(struct sockaddr_in &external, uint8_t &stable)
{
if (eaddrKnown)
{
external = eaddr;
if (eaddrStable)
stable = 1;
else
stable = 0;
return true;
}
return false;
@ -612,15 +615,21 @@ bool UdpSorter::checkStunKeepAlive()
}
bool UdpSorter::locked_recvdStun(const struct sockaddr_in &remote)
bool UdpSorter::locked_recvdStun(const struct sockaddr_in &remote, const struct sockaddr_in &extaddr)
{
#ifdef DEBUG_UDP_SORTER
std::cerr << "UdpSorter::recvdStun()";
std::cerr << std::endl;
std::ostringstream out;
out << "UdpSorter::locked_recvdStun() from:";
out << inet_ntoa(remote.sin_addr) << ":" << ntohs(remote.sin_port);
out << " claiming ExtAddr is:";
out << inet_ntoa(extaddr.sin_addr) << ":" << ntohs(extaddr.sin_port);
std::cerr << out.str() << std::endl;
#endif
locked_printStunList();
bool found = true;
std::list<TouStunPeer>::iterator it;
for(it = mStunList.begin(); it != mStunList.end(); it++)
{
@ -628,13 +637,85 @@ bool UdpSorter::locked_recvdStun(const struct sockaddr_in &remote)
(remote.sin_port == it->remote.sin_port))
{
it->failCount = 0;
return true;
it->eaddr = extaddr;
it->response = true;
found = true;
break;
}
}
if (!eaddrKnown)
{
locked_checkExternalAddress();
}
return found;
}
bool UdpSorter::locked_checkExternalAddress()
{
#ifdef DEBUG_UDP_SORTER
std::ostringstream out;
out << "UdpSorter::locked_checkExternalAddress()";
std::cerr << out.str() << std::endl;
#endif
bool found1 = false;
bool found2 = false;
std::list<TouStunPeer>::iterator it;
std::list<TouStunPeer>::iterator p1;
std::list<TouStunPeer>::iterator p2;
for(it = mStunList.begin(); it != mStunList.end(); it++)
{
if (it->response)
{
if (!found1)
{
p1 = it;
found1 = true;
}
else
{
p2 = it;
found2 = true;
break;
}
}
}
if (found1 && found2)
{
if ((p1->eaddr.sin_addr.s_addr == p2->eaddr.sin_addr.s_addr) &&
(p1->eaddr.sin_port == p2->eaddr.sin_port))
{
eaddrStable = true;
}
else
{
eaddrStable = false;
}
eaddrKnown = true;
eaddr = p1->eaddr;
#ifdef DEBUG_UDP_SORTER
std::cerr << "UdpSorter::locked_checkExternalAddress() Found State:";
if (eaddrStable)
std::cerr << " Stable NAT translation (GOOD!) ";
else
std::cerr << " unStable (symmetric NAT translation (BAD!) ";
std::cerr << std::endl;
#endif
return true;
}
return false;
}
bool UdpSorter::locked_printStunList()
{
std::ostringstream out;