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address lookup

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orignal 2016-03-26 10:31:47 -04:00
parent 0096a91a57
commit 215d39fc54
3 changed files with 126 additions and 6 deletions
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117
AddressBook.cpp
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@ -6,6 +6,7 @@
#include <chrono>
#include <condition_variable>
#include <boost/lexical_cast.hpp>
#include <openssl/rand.h>
#include "Base.h"
#include "util.h"
#include "Identity.h"
@ -218,10 +219,17 @@ namespace client
m_Storage->Init();
LoadHosts (); /* try storage, then hosts.txt, then download */
StartSubscriptions ();
StartLookups ();
}
void AddressBook::StartResolvers ()
{
LoadLocal ();
}
void AddressBook::Stop ()
{
StopLookups ();
StopSubscriptions ();
if (m_SubscriptionsUpdateTimer)
{
@ -330,7 +338,6 @@ namespace client
LoadHostsFromStream (f);
m_IsLoaded = true;
}
LoadLocal ();
}
void AddressBook::LoadHostsFromStream (std::istream& f)
@ -518,6 +525,94 @@ namespace client
}
}
void AddressBook::StartLookups ()
{
auto dest = i2p::client::context.GetSharedLocalDestination ();
if (dest)
{
auto datagram = dest->GetDatagramDestination ();
if (!datagram)
datagram = dest->CreateDatagramDestination ();
datagram->SetReceiver (std::bind (&AddressBook::HandleLookupResponse, this,
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5),
ADDRESS_RESPONSE_DATAGRAM_PORT);
}
}
void AddressBook::StopLookups ()
{
auto dest = i2p::client::context.GetSharedLocalDestination ();
if (dest)
{
auto datagram = dest->GetDatagramDestination ();
if (datagram)
datagram->ResetReceiver (ADDRESS_RESPONSE_DATAGRAM_PORT);
}
}
void AddressBook::LookupAddress (const std::string& address)
{
const i2p::data::IdentHash * ident = nullptr;
auto dot = address.find ('.');
if (dot != std::string::npos)
ident = FindAddress (address.substr (dot + 1));
if (!ident)
{
LogPrint (eLogError, "AddressBook: Can't find domain for ", address);
return;
}
auto dest = i2p::client::context.GetSharedLocalDestination ();
if (dest)
{
auto datagram = dest->GetDatagramDestination ();
if (datagram)
{
uint32_t nonce;
RAND_bytes ((uint8_t *)&nonce, 4);
{
std::unique_lock<std::mutex> l(m_LookupsMutex);
m_Lookups[nonce] = address;
}
LogPrint (eLogDebug, "AddressBook: Lookup of ", address, " to ", ident->ToBase32 (), " nonce=", nonce);
size_t len = address.length () + 9;
uint8_t * buf = new uint8_t[len];
memset (buf, 0, 4);
htobe32buf (buf + 4, nonce);
buf[8] = address.length ();
memcpy (buf + 9, address.c_str (), address.length ());
datagram->SendDatagramTo (buf, len, *ident, ADDRESS_RESPONSE_DATAGRAM_PORT, ADDRESS_RESOLVER_DATAGRAM_PORT);
delete[] buf;
}
}
}
void AddressBook::HandleLookupResponse (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
{
if (len < 44)
{
LogPrint (eLogError, "AddressBook: Lookup response is too short ", len);
return;
}
uint32_t nonce = bufbe32toh (buf + 4);
LogPrint (eLogDebug, "AddressBook: Lookup response received from ", from.GetIdentHash ().ToBase32 (), " nonce=", nonce);
std::string address;
{
std::unique_lock<std::mutex> l(m_LookupsMutex);
auto it = m_Lookups.find (nonce);
if (it != m_Lookups.end ())
{
address = it->second;
m_Lookups.erase (it);
}
}
if (address.length () > 0)
{
// TODO: verify from
m_Addresses[address] = buf + 8;
}
}
AddressBookSubscription::AddressBookSubscription (AddressBook& book, const std::string& link):
m_Book (book), m_Link (link)
{
@ -701,20 +796,31 @@ namespace client
}
}
AddressResolver::~AddressResolver ()
{
if (m_LocalDestination)
{
auto datagram = m_LocalDestination->GetDatagramDestination ();
if (datagram)
datagram->ResetReceiver (ADDRESS_RESOLVER_DATAGRAM_PORT);
}
}
void AddressResolver::HandleRequest (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
{
if (len < 9 || len < buf[8] + 9U)
{
LogPrint (eLogError, "Address request is too short ", len);
LogPrint (eLogError, "AddressBook: Address request is too short ", len);
return;
}
// read requested address
uint8_t l = buf[8];
char address[255];
memcpy (address, buf + 9, l);
address[l] = 0;
address[l] = 0;
LogPrint (eLogDebug, "AddressBook: Address request ", address);
// send response
uint8_t response[40];
uint8_t response[44];
memset (response, 0, 4); // reserved
memcpy (response + 4, buf + 4, 4); // nonce
auto it = m_LocalAddresses.find (address); // address lookup
@ -722,7 +828,8 @@ namespace client
memcpy (response + 8, it->second, 32); // ident
else
memset (response + 8, 0, 32); // not found
m_LocalDestination->GetDatagramDestination ()->SendDatagramTo (response, 40, from.GetIdentHash (), toPort, fromPort);
memset (response + 40, 0, 4); // set expiration time to zero
m_LocalDestination->GetDatagramDestination ()->SendDatagramTo (response, 44, from.GetIdentHash (), toPort, fromPort);
}
void AddressResolver::AddAddress (const std::string& name, const i2p::data::IdentHash& ident)