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708 lines
21 KiB
C++
708 lines
21 KiB
C++
#include <dht/context.hpp>
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#include <dht/explorenetworkjob.hpp>
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#include <dht/localrouterlookup.hpp>
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#include <dht/localserviceaddresslookup.hpp>
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#include <dht/localtaglookup.hpp>
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#include <dht/messages/findrouter.hpp>
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#include <dht/messages/gotintro.hpp>
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#include <dht/messages/gotrouter.hpp>
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#include <dht/messages/pubintro.hpp>
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#include <dht/node.hpp>
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#include <dht/publishservicejob.hpp>
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#include <dht/recursiverouterlookup.hpp>
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#include <dht/serviceaddresslookup.hpp>
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#include <dht/taglookup.hpp>
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#include <messages/dht_immediate.hpp>
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#include <path/path_context.hpp>
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#include <router/abstractrouter.hpp>
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#include <routing/dht_message.hpp>
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#include <util/logic.hpp>
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#include <nodedb.hpp>
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#include <vector>
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namespace llarp
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{
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namespace dht
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{
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AbstractContext::~AbstractContext()
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{
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}
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struct Context final : public AbstractContext
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{
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Context();
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~Context()
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{
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}
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util::StatusObject
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ExtractStatus() const override;
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/// on behalf of whoasked request introset for target from dht router with
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/// key askpeer
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void
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LookupIntroSetRecursive(
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const service::Address& target, const Key_t& whoasked,
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uint64_t whoaskedTX, const Key_t& askpeer, uint64_t R,
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service::IntroSetLookupHandler result = nullptr) override;
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void
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LookupIntroSetIterative(
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const service::Address& target, const Key_t& whoasked,
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uint64_t whoaskedTX, const Key_t& askpeer,
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service::IntroSetLookupHandler result = nullptr) override;
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/// on behalf of whoasked request router with public key target from dht
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/// router with key askpeer
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void
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LookupRouterRecursive(const RouterID& target, const Key_t& whoasked,
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uint64_t whoaskedTX, const Key_t& askpeer,
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RouterLookupHandler result = nullptr) override;
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bool
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LookupRouter(const RouterID& target, RouterLookupHandler result) override
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{
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Key_t askpeer;
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if(!_nodes->FindClosest(Key_t(target), askpeer))
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{
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return false;
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}
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LookupRouterRecursive(target, OurKey(), 0, askpeer, result);
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return true;
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}
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bool
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HasRouterLookup(const RouterID& target) const override
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{
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return pendingRouterLookups().HasLookupFor(target);
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}
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/// on behalf of whoasked request introsets with tag from dht router with
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/// key askpeer with Recursion depth R
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void
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LookupTagRecursive(const service::Tag& tag, const Key_t& whoasked,
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uint64_t whoaskedTX, const Key_t& askpeer,
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uint64_t R) override;
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/// issue dht lookup for tag via askpeer and send reply to local path
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void
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LookupTagForPath(const service::Tag& tag, uint64_t txid,
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const llarp::PathID_t& path,
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const Key_t& askpeer) override;
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/// issue dht lookup for router via askpeer and send reply to local path
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void
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LookupRouterForPath(const RouterID& target, uint64_t txid,
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const PathID_t& path, const Key_t& askpeer) override;
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/// issue dht lookup for introset for addr via askpeer and send reply to
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/// local path
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void
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LookupIntroSetForPath(const service::Address& addr, uint64_t txid,
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const llarp::PathID_t& path,
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const Key_t& askpeer) override;
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/// send a dht message to peer, if keepalive is true then keep the session
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/// with that peer alive for 10 seconds
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void
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DHTSendTo(const RouterID& peer, IMessage* msg,
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bool keepalive = true) override;
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/// get routers closest to target excluding requester
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bool
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HandleExploritoryRouterLookup(
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const Key_t& requester, uint64_t txid, const RouterID& target,
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std::vector< std::unique_ptr< IMessage > >& reply) override;
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std::set< service::IntroSet >
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FindRandomIntroSetsWithTagExcluding(
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const service::Tag& tag, size_t max = 2,
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const std::set< service::IntroSet >& excludes = {}) override;
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/// handle rc lookup from requester for target
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void
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LookupRouterRelayed(
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const Key_t& requester, uint64_t txid, const Key_t& target,
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bool recursive,
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std::vector< std::unique_ptr< IMessage > >& replies) override;
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/// relay a dht message from a local path to the main network
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bool
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RelayRequestForPath(const llarp::PathID_t& localPath,
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const IMessage& msg) override;
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/// send introset to peer from source with S counter and excluding peers
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void
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PropagateIntroSetTo(const Key_t& source, uint64_t sourceTX,
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const service::IntroSet& introset, const Key_t& peer,
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uint64_t S,
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const std::set< Key_t >& exclude) override;
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/// initialize dht context and explore every exploreInterval milliseconds
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void
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Init(const Key_t& us, AbstractRouter* router,
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llarp_time_t exploreInterval) override;
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/// get localally stored introset by service address
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const llarp::service::IntroSet*
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GetIntroSetByServiceAddress(
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const llarp::service::Address& addr) const override;
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static void
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handle_cleaner_timer(void* user, uint64_t orig, uint64_t left);
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static void
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handle_explore_timer(void* user, uint64_t orig, uint64_t left);
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/// explore dht for new routers
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void
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Explore(size_t N = 3);
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llarp::AbstractRouter* router;
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// for router contacts
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std::unique_ptr< Bucket< RCNode > > _nodes;
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// for introduction sets
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std::unique_ptr< Bucket< ISNode > > _services;
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Bucket< ISNode >*
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services() override
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{
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return _services.get();
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}
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bool allowTransit;
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bool&
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AllowTransit() override
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{
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return allowTransit;
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}
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const bool&
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AllowTransit() const override
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{
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return allowTransit;
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}
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Bucket< RCNode >*
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Nodes() const override
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{
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return _nodes.get();
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}
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const Key_t&
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OurKey() const override
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{
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return ourKey;
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}
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llarp::AbstractRouter*
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GetRouter() const override
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{
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return router;
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}
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bool
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GetRCFromNodeDB(const Key_t& k, llarp::RouterContact& rc) const override
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{
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return router->nodedb()->Get(k.as_array(), rc);
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}
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PendingIntrosetLookups _pendingIntrosetLookups;
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PendingTagLookups _pendingTagLookups;
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PendingRouterLookups _pendingRouterLookups;
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PendingExploreLookups _pendingExploreLookups;
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PendingIntrosetLookups&
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pendingIntrosetLookups() override
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{
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return _pendingIntrosetLookups;
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}
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const PendingIntrosetLookups&
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pendingIntrosetLookups() const override
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{
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return _pendingIntrosetLookups;
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}
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PendingTagLookups&
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pendingTagLookups() override
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{
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return _pendingTagLookups;
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}
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const PendingTagLookups&
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pendingTagLookups() const override
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{
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return _pendingTagLookups;
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}
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PendingRouterLookups&
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pendingRouterLookups() override
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{
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return _pendingRouterLookups;
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}
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const PendingRouterLookups&
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pendingRouterLookups() const override
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{
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return _pendingRouterLookups;
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}
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PendingExploreLookups&
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pendingExploreLookups() override
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{
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return _pendingExploreLookups;
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}
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const PendingExploreLookups&
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pendingExploreLookups() const override
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{
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return _pendingExploreLookups;
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}
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uint64_t
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NextID()
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{
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return ++ids;
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}
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llarp_time_t
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Now() const override;
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void
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ExploreNetworkVia(const Key_t& peer) override;
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private:
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void
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ScheduleCleanupTimer();
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void
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CleanupTX();
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uint64_t ids;
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Key_t ourKey;
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};
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Context::Context() : router(nullptr), allowTransit(false)
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{
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randombytes((byte_t*)&ids, sizeof(uint64_t));
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}
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void
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Context::Explore(size_t N)
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{
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// ask N random peers for new routers
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llarp::LogDebug("Exploring network via ", N, " peers");
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std::set< Key_t > peers;
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if(_nodes->GetManyRandom(peers, N))
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{
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for(const auto& peer : peers)
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ExploreNetworkVia(peer);
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}
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else
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llarp::LogError("failed to select ", N,
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" random nodes for exploration");
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}
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void
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Context::ExploreNetworkVia(const Key_t& askpeer)
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{
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uint64_t txid = ++ids;
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TXOwner peer(askpeer, txid);
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TXOwner whoasked(OurKey(), txid);
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pendingExploreLookups().NewTX(
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peer, whoasked, askpeer.as_array(),
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new ExploreNetworkJob(askpeer.as_array(), this));
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}
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void
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Context::handle_explore_timer(void* u, uint64_t orig, uint64_t left)
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{
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if(left)
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return;
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Context* ctx = static_cast< Context* >(u);
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const auto num =
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std::min(ctx->router->NumberOfConnectedRouters(), size_t(4));
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if(num)
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ctx->Explore(num);
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ctx->router->logic()->call_later({orig, ctx, &handle_explore_timer});
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}
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void
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Context::handle_cleaner_timer(void* u,
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__attribute__((unused)) uint64_t orig,
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uint64_t left)
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{
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if(left)
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return;
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Context* ctx = static_cast< Context* >(u);
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// clean up transactions
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ctx->CleanupTX();
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if(ctx->_services)
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{
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// expire intro sets
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auto now = ctx->Now();
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auto& nodes = ctx->_services->nodes;
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auto itr = nodes.begin();
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while(itr != nodes.end())
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{
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if(itr->second.introset.IsExpired(now))
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{
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llarp::LogDebug("introset expired ", itr->second.introset.A.Addr());
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itr = nodes.erase(itr);
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}
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else
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++itr;
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}
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}
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ctx->ScheduleCleanupTimer();
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}
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std::set< service::IntroSet >
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Context::FindRandomIntroSetsWithTagExcluding(
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const service::Tag& tag, size_t max,
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const std::set< service::IntroSet >& exclude)
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{
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std::set< service::IntroSet > found;
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auto& nodes = _services->nodes;
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if(nodes.size() == 0)
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{
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return found;
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}
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auto itr = nodes.begin();
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// start at random middle point
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auto start = llarp::randint() % nodes.size();
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std::advance(itr, start);
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auto end = itr;
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std::string tagname = tag.ToString();
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while(itr != nodes.end())
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{
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if(itr->second.introset.topic.ToString() == tagname)
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{
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if(exclude.count(itr->second.introset) == 0)
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{
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found.insert(itr->second.introset);
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if(found.size() == max)
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return found;
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}
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}
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++itr;
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}
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itr = nodes.begin();
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while(itr != end)
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{
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if(itr->second.introset.topic.ToString() == tagname)
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{
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if(exclude.count(itr->second.introset) == 0)
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{
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found.insert(itr->second.introset);
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if(found.size() == max)
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return found;
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}
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}
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++itr;
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}
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return found;
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}
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void
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Context::LookupRouterRelayed(
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const Key_t& requester, uint64_t txid, const Key_t& target,
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bool recursive, std::vector< std::unique_ptr< IMessage > >& replies)
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{
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if(target == ourKey)
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{
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// we are the target, give them our RC
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replies.emplace_back(
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new GotRouterMessage(requester, txid, {router->rc()}, false));
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return;
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}
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Key_t next;
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std::set< Key_t > excluding = {requester, ourKey};
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if(_nodes->FindCloseExcluding(target, next, excluding))
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{
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if(next == target)
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{
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// we know it
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replies.emplace_back(new GotRouterMessage(
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requester, txid, {_nodes->nodes[target].rc}, false));
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}
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else if(recursive) // are we doing a recursive lookup?
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{
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// is the next peer we ask closer to the target than us?
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if((next ^ target) < (ourKey ^ target))
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{
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// yes it is closer, ask neighbour recursively
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LookupRouterRecursive(target.as_array(), requester, txid, next);
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}
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else
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{
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// no we are closer to the target so tell requester it's not there
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// so they switch to iterative lookup
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replies.emplace_back(
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new GotRouterMessage(requester, txid, {}, false));
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}
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}
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else
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{
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// iterative lookup and we don't have it tell them who is closer
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replies.emplace_back(
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new GotRouterMessage(requester, next, txid, false));
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}
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}
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else
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{
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// we don't know it and have no closer peers to ask
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replies.emplace_back(new GotRouterMessage(requester, txid, {}, false));
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}
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}
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const llarp::service::IntroSet*
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Context::GetIntroSetByServiceAddress(
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const llarp::service::Address& addr) const
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{
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auto key = addr.ToKey();
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auto itr = _services->nodes.find(key);
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if(itr == _services->nodes.end())
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return nullptr;
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return &itr->second.introset;
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}
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void
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Context::CleanupTX()
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{
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auto now = Now();
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llarp::LogDebug("DHT tick");
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pendingRouterLookups().Expire(now);
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_pendingIntrosetLookups.Expire(now);
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pendingTagLookups().Expire(now);
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pendingExploreLookups().Expire(now);
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}
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util::StatusObject
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Context::ExtractStatus() const
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{
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util::StatusObject obj{
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{"pendingRouterLookups", pendingRouterLookups().ExtractStatus()},
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{"pendingIntrosetLookups", _pendingIntrosetLookups.ExtractStatus()},
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{"pendingTagLookups", pendingTagLookups().ExtractStatus()},
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{"pendingExploreLookups", pendingExploreLookups().ExtractStatus()},
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{"nodes", _nodes->ExtractStatus()},
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{"services", _services->ExtractStatus()},
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{"ourKey", ourKey.ToHex()}};
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return obj;
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}
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void
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Context::Init(const Key_t& us, AbstractRouter* r,
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llarp_time_t exploreInterval)
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{
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router = r;
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ourKey = us;
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_nodes = std::make_unique< Bucket< RCNode > >(ourKey, llarp::randint);
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_services = std::make_unique< Bucket< ISNode > >(ourKey, llarp::randint);
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llarp::LogDebug("initialize dht with key ", ourKey);
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// start exploring
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r->logic()->call_later(
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{exploreInterval, this, &llarp::dht::Context::handle_explore_timer});
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// start cleanup timer
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ScheduleCleanupTimer();
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}
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void
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Context::ScheduleCleanupTimer()
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{
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router->logic()->call_later({1000, this, &handle_cleaner_timer});
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}
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void
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Context::DHTSendTo(const RouterID& peer, IMessage* msg, bool)
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{
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llarp::DHTImmediateMessage m;
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m.msgs.emplace_back(msg);
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router->SendToOrQueue(peer, &m);
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auto now = Now();
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router->PersistSessionUntil(peer, now + 60000);
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}
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bool
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Context::RelayRequestForPath(const llarp::PathID_t& id, const IMessage& msg)
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{
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llarp::routing::DHTMessage reply;
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if(!msg.HandleMessage(router->dht(), reply.M))
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return false;
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if(!reply.M.empty())
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{
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auto path = router->pathContext().GetByUpstream(router->pubkey(), id);
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return path && path->SendRoutingMessage(reply, router);
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}
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return true;
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}
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void
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Context::LookupIntroSetForPath(const service::Address& addr, uint64_t txid,
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const llarp::PathID_t& path,
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const Key_t& askpeer)
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{
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TXOwner asker(OurKey(), txid);
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TXOwner peer(askpeer, ++ids);
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_pendingIntrosetLookups.NewTX(
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peer, asker, addr,
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new LocalServiceAddressLookup(path, txid, addr, this, askpeer));
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}
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|
|
|
void
|
|
Context::PropagateIntroSetTo(const Key_t& from, uint64_t txid,
|
|
const service::IntroSet& introset,
|
|
const Key_t& tellpeer, uint64_t S,
|
|
const std::set< Key_t >& exclude)
|
|
{
|
|
TXOwner asker(from, txid);
|
|
TXOwner peer(tellpeer, ++ids);
|
|
service::Address addr = introset.A.Addr();
|
|
_pendingIntrosetLookups.NewTX(
|
|
peer, asker, addr,
|
|
new PublishServiceJob(asker, introset, this, S, exclude));
|
|
}
|
|
|
|
void
|
|
Context::LookupIntroSetRecursive(const service::Address& addr,
|
|
const Key_t& whoasked, uint64_t txid,
|
|
const Key_t& askpeer, uint64_t R,
|
|
service::IntroSetLookupHandler handler)
|
|
{
|
|
TXOwner asker(whoasked, txid);
|
|
TXOwner peer(askpeer, ++ids);
|
|
_pendingIntrosetLookups.NewTX(
|
|
peer, asker, addr,
|
|
new ServiceAddressLookup(asker, addr, this, R, handler));
|
|
}
|
|
|
|
void
|
|
Context::LookupIntroSetIterative(const service::Address& addr,
|
|
const Key_t& whoasked, uint64_t txid,
|
|
const Key_t& askpeer,
|
|
service::IntroSetLookupHandler handler)
|
|
{
|
|
TXOwner asker(whoasked, txid);
|
|
TXOwner peer(askpeer, ++ids);
|
|
_pendingIntrosetLookups.NewTX(
|
|
peer, asker, addr,
|
|
new ServiceAddressLookup(asker, addr, this, 0, handler));
|
|
}
|
|
|
|
void
|
|
Context::LookupTagRecursive(const service::Tag& tag, const Key_t& whoasked,
|
|
uint64_t whoaskedTX, const Key_t& askpeer,
|
|
uint64_t R)
|
|
{
|
|
TXOwner asker(whoasked, whoaskedTX);
|
|
TXOwner peer(askpeer, ++ids);
|
|
_pendingTagLookups.NewTX(peer, asker, tag,
|
|
new TagLookup(asker, tag, this, R));
|
|
llarp::LogDebug("ask ", askpeer.SNode(), " for ", tag, " on behalf of ",
|
|
whoasked.SNode(), " R=", R);
|
|
}
|
|
|
|
void
|
|
Context::LookupTagForPath(const service::Tag& tag, uint64_t txid,
|
|
const llarp::PathID_t& path, const Key_t& askpeer)
|
|
{
|
|
TXOwner peer(askpeer, ++ids);
|
|
TXOwner whoasked(OurKey(), txid);
|
|
_pendingTagLookups.NewTX(peer, whoasked, tag,
|
|
new LocalTagLookup(path, txid, tag, this));
|
|
}
|
|
|
|
bool
|
|
Context::HandleExploritoryRouterLookup(
|
|
const Key_t& requester, uint64_t txid, const RouterID& target,
|
|
std::vector< std::unique_ptr< IMessage > >& reply)
|
|
{
|
|
std::vector< RouterID > closer;
|
|
const Key_t t(target.as_array());
|
|
std::set< Key_t > found;
|
|
if(!_nodes)
|
|
return false;
|
|
|
|
const size_t nodeCount = _nodes->size();
|
|
if(nodeCount == 0)
|
|
{
|
|
llarp::LogError(
|
|
"cannot handle exploritory router lookup, no dht peers");
|
|
return false;
|
|
}
|
|
llarp::LogDebug("We have ", _nodes->size(),
|
|
" connected nodes into the DHT");
|
|
// ourKey should never be in the connected list
|
|
// requester is likely in the connected list
|
|
// 4 or connection nodes (minus a potential requestor), whatever is less
|
|
if(!_nodes->GetManyNearExcluding(t, found, nodeCount >= 4 ? 4 : 1,
|
|
std::set< Key_t >{ourKey, requester}))
|
|
{
|
|
llarp::LogError(
|
|
"not enough dht nodes to handle exploritory router lookup, "
|
|
"have ",
|
|
nodeCount, " dht peers");
|
|
return false;
|
|
}
|
|
for(const auto& f : found)
|
|
{
|
|
const RouterID r(f.as_array());
|
|
if(GetRouter()->ConnectionToRouterAllowed(r))
|
|
closer.emplace_back(r);
|
|
}
|
|
reply.emplace_back(new GotRouterMessage(txid, closer, false));
|
|
return true;
|
|
}
|
|
|
|
void
|
|
Context::LookupRouterForPath(const RouterID& target, uint64_t txid,
|
|
const llarp::PathID_t& path,
|
|
const Key_t& askpeer)
|
|
|
|
{
|
|
TXOwner peer(askpeer, ++ids);
|
|
TXOwner whoasked(OurKey(), txid);
|
|
_pendingRouterLookups.NewTX(
|
|
peer, whoasked, target,
|
|
new LocalRouterLookup(path, txid, target, this));
|
|
}
|
|
|
|
void
|
|
Context::LookupRouterRecursive(const RouterID& target,
|
|
const Key_t& whoasked, uint64_t txid,
|
|
const Key_t& askpeer,
|
|
RouterLookupHandler handler)
|
|
{
|
|
TXOwner asker(whoasked, txid);
|
|
TXOwner peer(askpeer, ++ids);
|
|
_pendingRouterLookups.NewTX(
|
|
peer, asker, target,
|
|
new RecursiveRouterLookup(asker, target, this, handler));
|
|
}
|
|
|
|
llarp_time_t
|
|
Context::Now() const
|
|
{
|
|
return router->Now();
|
|
}
|
|
|
|
std::unique_ptr< AbstractContext >
|
|
makeContext()
|
|
{
|
|
return std::make_unique< Context >();
|
|
}
|
|
|
|
} // namespace dht
|
|
} // namespace llarp
|