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implemented a verification for tunnel results. When the network gets heavily loaded, some tunnel results happen to get back twice. This stops the tunnel result sibblings

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git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4152 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
csoler 2011-04-10 19:22:15 +00:00
parent 97b4d5df41
commit 4ea647b78c
2 changed files with 22 additions and 8 deletions
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24
libretroshare/src/turtle/p3turtle.cc
View File

@ -770,7 +770,7 @@ void p3turtle::handleSearchRequest(RsTurtleSearchRequestItem *item)
// We use a random factor on the depth test that is biased by a mix between the session id and the partial tunnel id
// to scramble a possible search-by-depth attack.
//
bool random_bypass = (item->depth == TURTLE_MAX_SEARCH_DEPTH && (_random_bias ^ item->request_id)&0x7==2) ;
bool random_bypass = (item->depth == TURTLE_MAX_SEARCH_DEPTH && (((_random_bias ^ item->request_id)&0x7)==2)) ;
if(item->depth < TURTLE_MAX_SEARCH_DEPTH || random_bypass)
{
@ -1548,11 +1548,12 @@ void p3turtle::handleTunnelRequest(RsTurtleOpenTunnelItem *item)
//
if(it->second.depth > item->depth && ((item->partial_tunnel_id ^ _random_bias)&0x7)>0)
{
//#ifdef P3TURTLE_DEBUG
#ifdef P3TURTLE_DEBUG
std::cerr << " re-routing tunnel request. Item age difference = " << time(NULL)-it->second.time_stamp << std::endl;
std::cerr << " - old source: " << it->second.origin << ", old depth=" << it->second.depth << std::endl ;
std::cerr << " - new source: " << item->PeerId() << ", new depth=" << item->depth << std::endl ;
//#endif
std::cerr << " - half id: " << (void*)it->first << std::endl ;
#endif
it->second.origin = item->PeerId() ;
it->second.depth = item->depth ;
}
@ -1637,7 +1638,7 @@ void p3turtle::handleTunnelRequest(RsTurtleOpenTunnelItem *item)
// If search depth not too large, also forward this search request to all other peers.
//
bool random_bypass = (item->depth == TURTLE_MAX_SEARCH_DEPTH && (_random_bias ^ item->partial_tunnel_id)&0x7==2) ;
bool random_bypass = (item->depth == TURTLE_MAX_SEARCH_DEPTH && (((_random_bias ^ item->partial_tunnel_id)&0x7)==2)) ;
if(item->depth < TURTLE_MAX_SEARCH_DEPTH || random_bypass)
{
@ -1678,19 +1679,30 @@ void p3turtle::handleTunnelResult(RsTurtleTunnelOkItem *item)
// Find who actually sent the corresponding turtle tunnel request.
//
std::map<TurtleTunnelRequestId,TurtleRequestInfo>::const_iterator it = _tunnel_requests_origins.find(item->request_id) ;
std::map<TurtleTunnelRequestId,TurtleRequestInfo>::iterator it = _tunnel_requests_origins.find(item->request_id) ;
#ifdef P3TURTLE_DEBUG
std::cerr << "Received tunnel result:" << std::endl ;
item->print(std::cerr,0) ;
#endif
if(it == _tunnel_requests_origins.end())
{
// This is an error: how could we receive a tunnel result corresponding to a tunnel item we
// have forwarded but that it not in the list ??
// have forwarded but that it not in the list ?? Actually that happens, when tunnel requests
// get too old, before the tunnelOk item gets back. But this is quite unusual.
#ifdef P3TURTLE_DEBUG
std::cerr << __PRETTY_FUNCTION__ << ": tunnel result has no peer direction!" << std::endl ;
#endif
return ;
}
if(it->second.responses.find(item->tunnel_id) != it->second.responses.end())
{
std::cerr << "p3turtle: ERROR: received a tunnel response twice. That should not happen." << std::endl;
return ;
}
else
it->second.responses.insert(item->tunnel_id) ;
// store tunnel info.
bool found = (_local_tunnels.find(item->tunnel_id) != _local_tunnels.end()) ;

2
libretroshare/src/turtle/p3turtle.h
View File

@ -139,6 +139,7 @@
#include <string>
#include <list>
#include <set>
#include "pqi/pqinetwork.h"
#include "pqi/pqi.h"
@ -165,6 +166,7 @@ class TurtleRequestInfo
TurtlePeerId origin ; // where the request came from.
uint32_t time_stamp ; // last time the tunnel was actually used. Used for cleaning old tunnels.
int depth ; // depth of the request. Used to optimize tunnel length.
std::set<uint32_t> responses; // responses to this request. Useful to avoid spamming tunnel responses.
};
class TurtleTunnel