temp commit

CMakeLists.txt

@@ -254,7 +254,7 @@ endif()
 if(TESTNET)
   add_definitions(-DTESTNET=1)
   # 5 times slower than realtime
-  add_definitions(-DTESTNET_SPEED=5)
+  # add_definitions(-DTESTNET_SPEED=5)
 endif()
 
 if(SHADOW)

include/lokinet.h

@@ -5,4 +5,4 @@
 #include "lokinet/lokinet_misc.h"
 #include "lokinet/lokinet_addr.h"
 #include "lokinet/lokinet_stream.h"
-
+#include "lokinet/lokinet_udp.h"

include/lokinet/lokinet_addr.h

@@ -6,7 +6,7 @@ extern "C"
 {
 #endif
 
-/// get a free()-able null terminated string that holds our .loki address
+  /// get a free()-able null terminated string that holds our .loki address
   /// returns NULL if we dont have one right now
   char*
   lokinet_address(struct lokinet_context*);

include/lokinet/lokinet_context.h

@@ -4,7 +4,6 @@
 #include <stdint.h>
 #include <unistd.h>
 
-
 #ifdef __cplusplus
 extern "C"
 {
@@ -49,7 +48,6 @@ extern "C"
   int
   lokinet_add_bootstrap_rc(const char*, size_t, struct lokinet_context*);
 
-  
 #ifdef __cplusplus
 }
 #endif

include/lokinet/lokinet_misc.h

@@ -1,6 +1,5 @@
 #pragma once
 
-
 #ifdef __cplusplus
 extern "C"
 {

include/lokinet/lokinet_os.h

@@ -0,0 +1,26 @@
+#pragma once
+
+/// OS specific types
+
+#ifdef _WIN32
+
+#else
+#include <sys/uio.h>
+#include <poll.h>
+
+#endif
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#ifdef _WIN32
+  typedef HANDLE OS_FD_t;
+#else
+typedef int OS_FD_t;
+#endif
+
+#ifdef __cplusplus
+}
+#endif

include/lokinet/lokinet_socket.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "lokinet_context.h"
+#include "lokinet_os.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+  /// poll many sockets for activity
+  /// each pollfd.fd should be set to the socket id
+  /// returns 0 on sucess
+  int
+  lokinet_poll(struct pollfd* poll, nfds_t numsockets, struct lokinet_context* ctx);
+
+  /// close a udp socket or a stream socket by its id
+  void
+  lokinet_close_socket(int id, struct lokinet_context* ctx);
+
+#ifdef __cplusplus
+}
+#endif

include/lokinet/lokinet_srv.h

@@ -15,7 +15,7 @@ extern "C"
     /// the weight of this record
     uint16_t weight;
     /// null terminated string of the hostname
-    char * target;
+    char target[256];
     /// the port to use
     int port;
   };
@@ -26,35 +26,38 @@ extern "C"
   /// the result of an srv lookup
   struct lokinet_srv_lookup_result
   {
-    /// pointer to internal members
-    /// dont touch me
-    struct lokinet_srv_lookup_private * internal;
     /// set to zero on success otherwise is the error code
-    /// 
     int error;
+    /// pointer to internal members
+    /// dont touch me
+    struct lokinet_srv_lookup_private* internal;
   };
 
   /// do a srv lookup on host for service
   /// caller MUST call lokinet_srv_lookup_done when they are done handling the result
-  void
-  lokinet_srv_lookup(char * host, char * service, struct lokinet_srv_lookup_result * result, struct lokinet_context * ctx);
+  int
+  lokinet_srv_lookup(
+      char* host,
+      char* service,
+      struct lokinet_srv_lookup_result* result,
+      struct lokinet_context* ctx);
 
-  
   /// a hook function to handle each srv record in a srv lookup result
   /// passes in NULL when we are at the end of iteration
   /// passes in void * user data
   /// hook should NOT free the record
-  typedef void (*lokinet_srv_record_iterator)(struct lokinet_srv_record *, void *);
+  typedef void (*lokinet_srv_record_iterator)(struct lokinet_srv_record*, void*);
 
   /// iterate over each srv record in a lookup result
-  /// user is passes into hook and called for each result and then with NULL as the result on the end of iteration
+  /// user is passes into hook and called for each result and then with NULL as the result on the
+  /// end of iteration
   void
-  lokinet_for_each_srv_record(struct lokinet_srv_lookup_result * result, lokinet_srv_record_iterator iter, void * user);
-
+  lokinet_for_each_srv_record(
+      struct lokinet_srv_lookup_result* result, lokinet_srv_record_iterator iter, void* user);
 
   /// free internal members of a srv lookup result after use of the result
   void
-  lokinet_srv_lookup_done(struct lokinet_srv_lookup_result * result);
+  lokinet_srv_lookup_done(struct lokinet_srv_lookup_result* result);
 
 #ifdef __cplusplus
 }

include/lokinet/lokinet_stream.h

@@ -53,10 +53,6 @@ extern "C"
   int
   lokinet_inbound_stream(uint16_t port, struct lokinet_context* context);
 
-  /// close a stream by id
-  void
-  lokinet_close_stream(int stream_id, struct lokinet_context* context);
-
 #ifdef __cplusplus
 }
 #endif

include/lokinet/lokinet_udp.h

@@ -0,0 +1,83 @@
+#pragma once
+
+#include "lokinet_context.h"
+#include "lokinet_os.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+  /// information about a udp flow
+  struct lokinet_udp_flow
+  {
+    /// the socket id for this flow used for i/o purposes and closing this socket
+    int socket_id;
+    /// remote endpoint's .loki or .snode address
+    char remote_addr[256];
+    /// local endpoint's ip address
+    char local_addr[64];
+    /// remote endpont's port
+    int remote_port;
+    /// local endpoint's port
+    int local_port;
+  };
+
+  /// establish an outbound udp flow
+  /// remoteHost is the remote .loki or .snode address conneting to
+  /// remotePort is either a string integer or an srv record name to lookup, e.g. thingservice in
+  /// which we do a srv lookup for _udp.thingservice.remotehost.tld and use the "best" port provided
+  /// localAddr is the local ip:port to bind our socket to, if localAddr is NULL then
+  /// lokinet_udp_sendmmsg MUST be used to send packets return 0 on success return nonzero on fail,
+  /// containing an errno value
+  int
+  lokinet_udp_establish(
+      char* remoteHost,
+      char* remotePort,
+      char* localAddr,
+      struct lokinet_udp_flow* flow,
+      struct lokinet_context* ctx);
+
+  /// a result from a lokinet_udp_bind call
+  struct lokinet_udp_bind_result
+  {
+    /// a socket id used to close a lokinet udp socket
+    int socket_id;
+  };
+
+  /// inbound listen udp socket
+  /// expose udp port exposePort to the void
+  /// if srv is not NULL add an srv record for this port, the format being "thingservice" in which
+  /// will add a srv record "_udp.thingservice.ouraddress.tld" that advertises this port provide
+  /// localAddr to forward inbound udp packets to "ip:port" if localAddr is NULL then the resulting
+  /// socket MUST be drained by lokinet_udp_recvmmsg returns 0 on success returns nonzero on error
+  /// in which it is an errno value
+  int
+  lokinet_udp_bind(
+      int exposedPort,
+      char* srv,
+      char* localAddr,
+      struct lokinet_udp_listen_result* result,
+      struct lokinet_context* ctx);
+
+  /// poll many udp sockets for activity
+  /// each pollfd.fd should be set to the udp socket id
+  /// returns 0 on sucess
+  int
+  lokinet_udp_poll(struct pollfd* poll, nfds_t numsockets, struct lokinet_context* ctx);
+
+  struct lokinet_udp_pkt
+  {
+    char remote_addr[256];
+    int remote_port;
+    struct iovec pkt;
+  };
+
+  /// analog to recvmmsg
+  ssize_t
+  lokinet_udp_recvmmsg(
+      int socket_id, struct lokinet_udp_pkt* pkts, size_t numevents, struct lokient_context* ctx);
+
+#ifdef __cplusplus
+}
+#endif

llarp/config/config.cpp

@@ -288,9 +288,16 @@ namespace llarp
         "network",
         "strict-connect",
         ClientOnly,
-        AssignmentAcceptor(m_strictConnect),
+        MultiValue,
+        [this](std::string value) {
+          RouterID router;
+          if (not router.FromString(value))
+            throw std::invalid_argument{"bad snode value: " + value};
+          if (not m_strictConnect.insert(router).second)
+            throw std::invalid_argument{"duplicate strict connect snode: " + value};
+        },
         Comment{
-            "Public key of a router which will act as sole first-hop. This may be used to",
+            "Public key of a router which will act as a pinned first-hop. This may be used to",
             "provide a trusted router (consider that you are not fully anonymous with your",
             "first hop).",
         });
@@ -392,7 +399,7 @@ namespace llarp
             "Number of paths to maintain at any given time.",
         },
         [this](int arg) {
-          if (arg < 2 or arg > 8)
+          if (arg < 3 or arg > 8)
             throw std::invalid_argument("[endpoint]:paths must be >= 2 and <= 8");
           m_Paths = arg;
         });

llarp/config/config.hpp

@@ -94,7 +94,7 @@ namespace llarp
   {
     std::optional<bool> m_enableProfiling;
     bool m_saveProfiles;
-    std::string m_strictConnect;
+    std::set<RouterID> m_strictConnect;
     std::string m_ifname;
     IPRange m_ifaddr;
 

llarp/dht/context.cpp

@@ -335,6 +335,22 @@ namespace llarp
       CleanupTX();
       const llarp_time_t now = Now();
 
+      if (_nodes)
+      {
+        // expire router contacts in memory
+        auto& nodes = _nodes->nodes;
+        auto itr = nodes.begin();
+        while (itr != nodes.end())
+        {
+          if (itr->second.rc.IsExpired(now))
+          {
+            itr = nodes.erase(itr);
+          }
+          else
+            ++itr;
+        }
+      }
+
       if (_services)
       {
         // expire intro sets
@@ -463,10 +479,7 @@ namespace llarp
     {
       llarp::DHTImmediateMessage m;
       m.msgs.emplace_back(msg);
-      router->SendToOrQueue(peer, &m, [](SendStatus status) {
-        if (status != SendStatus::Success)
-          LogInfo("DHTSendTo unsuccessful, status: ", (int)status);
-      });
+      router->SendToOrQueue(peer, m);
       auto now = Now();
       router->PersistSessionUntil(peer, now + 1min);
     }

llarp/dns/srv_data.cpp

@@ -117,7 +117,8 @@ namespace llarp::dns
     if (not bencode_discard(buf))
       return false;
     byte_t* end = buf->cur;
-    std::string_view srvString{reinterpret_cast<char*>(begin), end - begin};
+    std::string_view srvString{
+        reinterpret_cast<char*>(begin), static_cast<std::size_t>(end - begin)};
     try
     {
       SRVTuple tuple{};

llarp/endpoint_base.hpp

@@ -123,6 +123,13 @@ namespace llarp
     virtual bool
     SendToOrQueue(
         service::ConvoTag tag, const llarp_buffer_t& payload, service::ProtocolType t) = 0;
+
+    /// lookup srv records async
+    virtual void
+    LookupServiceAsync(
+        std::string name,
+        std::string service,
+        std::function<void(std::vector<dns::SRVData>)> resultHandler) = 0;
   };
 
 }  // namespace llarp

llarp/handlers/exit.cpp

@@ -40,6 +40,14 @@ namespace llarp
       resultHandler(std::nullopt);
     }
 
+    void
+    ExitEndpoint::LookupServiceAsync(
+        std::string, std::string, std::function<void(std::vector<dns::SRVData>)> resultHandler)
+    {
+      // TODO: implement me
+      resultHandler({});
+    }
+
     std::optional<EndpointBase::AddressVariant_t>
     ExitEndpoint::GetEndpointWithConvoTag(service::ConvoTag tag) const
     {

llarp/handlers/exit.hpp

@@ -69,6 +69,12 @@ namespace llarp
       bool
       HandleHookedDNSMessage(dns::Message msg, std::function<void(dns::Message)>) override;
 
+      void
+      LookupServiceAsync(
+          std::string name,
+          std::string service,
+          std::function<void(std::vector<dns::SRVData>)> handler) override;
+
       bool
       AllocateNewExit(const PubKey pk, const PathID_t& path, bool permitInternet);
 

llarp/handlers/tun.cpp

@@ -79,8 +79,8 @@ namespace llarp
         const SockAddr laddr{src, nuint16_t{*reinterpret_cast<const uint16_t*>(ptr)}};
         const SockAddr raddr{dst, nuint16_t{*reinterpret_cast<const uint16_t*>(ptr + 2)}};
 
-        OwnedBuffer buf{pkt.sz - (udp_header_size + ip_header_size)};
-        std::copy_n(ptr + udp_header_size, buf.sz, buf.buf.get());
+        OwnedBuffer buf{pkt.sz - (8 + ip_header_size)};
+        std::copy_n(ptr + 8, buf.sz, buf.buf.get());
         if (m_Resolver->ShouldHandlePacket(laddr, raddr, buf))
           m_Resolver->HandlePacket(laddr, raddr, buf);
         else

llarp/lokinet_shared.cpp

@@ -126,8 +126,64 @@ namespace
     return -1;
   }
 
+  lokinet_srv_record
+  SRVFromData(const llarp::dns::SRVData& data, std::string name)
+  {
+    // TODO: implement me
+    (void)data;
+    (void)name;
+    return {};
+  }
+
 }  // namespace
 
+struct lokinet_srv_lookup_private
+{
+  std::vector<lokinet_srv_record> results;
+
+  int
+  LookupSRV(std::string host, std::string service, lokinet_context* ctx)
+  {
+    std::promise<int> promise;
+    {
+      auto lock = ctx->acquire();
+      if (ctx->impl and ctx->impl->IsUp())
+      {
+        ctx->impl->CallSafe([host, service, &promise, ctx, self = this]() {
+          auto ep = ctx->endpoint();
+          if (ep == nullptr)
+          {
+            promise.set_value(ENOTSUP);
+            return;
+          }
+          ep->LookupServiceAsync(host, service, [self, &promise, host](auto results) {
+            // for (const auto& result : results)
+            // {
+            //   self->results.emplace_back(SRVFromData(result, host));
+            // }
+            promise.set_value(0);
+          });
+        });
+      }
+      else
+      {
+        promise.set_value(EHOSTDOWN);
+      }
+    }
+    auto future = promise.get_future();
+    return future.get();
+  }
+
+  void
+  IterateAll(std::function<void(lokinet_srv_record*)> visit)
+  {
+    for (size_t idx = 0; idx < results.size(); ++idx)
+      visit(&results[idx]);
+    // null terminator
+    visit(nullptr);
+  }
+};
+
 extern "C"
 {
   struct lokinet_context*
@@ -502,4 +558,43 @@ extern "C"
     catch (...)
     {}
   }
+
+  int
+  lokinet_srv_lookup(
+      char* host,
+      char* service,
+      struct lokinet_srv_lookup_result* result,
+      struct lokinet_context* ctx)
+  {
+    if (result == nullptr or ctx == nullptr or host == nullptr or service == nullptr)
+      return -1;
+    // sanity check, if the caller has not free()'d internals yet free them
+    if (result->internal)
+      delete result->internal;
+    result->internal = new lokinet_srv_lookup_private{};
+    return result->internal->LookupSRV(host, service, ctx);
+  }
+
+  void
+  lokinet_for_each_srv_record(
+      struct lokinet_srv_lookup_result* result, lokinet_srv_record_iterator iter, void* user)
+  {
+    if (result and result->internal)
+    {
+      result->internal->IterateAll([iter, user](auto* result) { iter(result, user); });
+    }
+    else
+    {
+      iter(nullptr, user);
+    }
+  }
+
+  void
+  lokinet_srv_lookup_done(struct lokinet_srv_lookup_result* result)
+  {
+    if (result == nullptr or result->internal == nullptr)
+      return;
+    delete result->internal;
+    result->internal = nullptr;
+  }
 }

llarp/messages/dht_immediate.cpp

@@ -74,7 +74,7 @@ namespace llarp
     {
       if (result)
       {
-        result = router->SendToOrQueue(session->GetPubKey(), &reply);
+        result = router->SendToOrQueue(session->GetPubKey(), reply);
       }
     }
     return true;

llarp/messages/relay_status.cpp

@@ -232,7 +232,7 @@ namespace llarp
       AbstractRouter* router, const RouterID nextHop, std::shared_ptr<LR_StatusMessage> msg)
   {
     llarp::LogDebug("Attempting to send LR_Status message to (", nextHop, ")");
-    if (not router->SendToOrQueue(nextHop, msg.get()))
+    if (not router->SendToOrQueue(nextHop, *msg))
     {
       llarp::LogError("Sending LR_Status message, SendToOrQueue to ", nextHop, " failed");
     }

llarp/path/path.cpp

@@ -436,7 +436,7 @@ namespace llarp
     {
       for (const auto& msg : msgs)
       {
-        if (r->SendToOrQueue(Upstream(), &msg))
+        if (r->SendToOrQueue(Upstream(), msg))
         {
           m_TXRate += msg.X.size();
         }

llarp/path/path_context.cpp

@@ -83,11 +83,11 @@ namespace llarp
         return false;
       }
 
-      auto msg = std::make_shared<const LR_CommitMessage>(frames);
+      const LR_CommitMessage msg{frames};
 
       LogDebug("forwarding LRCM to ", nextHop);
 
-      return m_Router->SendToOrQueue(nextHop, msg.get(), handler);
+      return m_Router->SendToOrQueue(nextHop, msg, handler);
     }
 
     template <

llarp/path/pathbuilder.cpp

@@ -130,7 +130,6 @@ namespace llarp
       ctx->router->NotifyRouterEvent<tooling::PathAttemptEvent>(ctx->router->pubkey(), ctx->path);
 
       const RouterID remote = ctx->path->Upstream();
-      const ILinkMessage* msg = &ctx->LRCM;
       auto sentHandler = [ctx](auto status) {
         if (status == SendStatus::Success)
         {
@@ -145,7 +144,7 @@ namespace llarp
         ctx->path = nullptr;
         ctx->pathset = nullptr;
       };
-      if (ctx->router->SendToOrQueue(remote, msg, sentHandler))
+      if (ctx->router->SendToOrQueue(remote, ctx->LRCM, sentHandler))
       {
         // persist session with router until this path is done
         if (ctx->path)
@@ -300,7 +299,7 @@ namespace llarp
     void
     Builder::BuildOne(PathRole roles)
     {
-      if (const auto maybe = GetHopsForBuild(); maybe.has_value())
+      if (const auto maybe = GetHopsForBuild())
         Build(*maybe, roles);
     }
 
@@ -318,7 +317,10 @@ namespace llarp
       {
         const auto maybe = SelectFirstHop(exclude);
         if (not maybe.has_value())
+        {
+          LogWarn(Name(), " has no first hop candidate");
           return std::nullopt;
+        }
         hops.emplace_back(*maybe);
       };
 
@@ -395,15 +397,13 @@ namespace llarp
     {
       if (IsStopped())
         return;
-
+      lastBuild = Now();
       const RouterID edge{hops[0].pubkey};
       if (not m_EdgeLimiter.Insert(edge))
       {
         LogWarn(Name(), " building too fast to edge router ", edge);
         return;
       }
-
-      lastBuild = Now();
       // async generate keys
       auto ctx = std::make_shared<AsyncPathKeyExchangeContext>();
       ctx->router = m_router;

llarp/path/transit_hop.cpp

@@ -214,7 +214,7 @@ namespace llarp
               info.downstream,
               " to ",
               info.upstream);
-          r->SendToOrQueue(info.upstream, &msg);
+          r->SendToOrQueue(info.upstream, msg);
         }
         r->linkManager().PumpLinks();
       }
@@ -232,7 +232,7 @@ namespace llarp
             info.upstream,
             " to ",
             info.downstream);
-        r->SendToOrQueue(info.downstream, &msg);
+        r->SendToOrQueue(info.downstream, msg);
       }
       r->linkManager().PumpLinks();
     }

llarp/quic/connection.cpp

@@ -1088,7 +1088,7 @@ namespace llarp::quic
     std::string_view lokinet_metadata{
         reinterpret_cast<const char*>(
             data.substr(lokinet_metadata_code.size() + meta_len_bytes).data()),
-        meta_len};
+        static_cast<std::size_t>(meta_len)};
     LogDebug("Received bencoded lokinet metadata: ", buffer_printer{lokinet_metadata});
 
     uint16_t port;

llarp/quic/stream.hpp

@@ -9,7 +9,7 @@
 #include <type_traits>
 #include <variant>
 #include <vector>
-
+#include <optional>
 #include <uvw/async.h>
 
 namespace llarp::quic

llarp/router/abstractrouter.hpp

@@ -243,7 +243,7 @@ namespace llarp
 
     virtual bool
     SendToOrQueue(
-        const RouterID& remote, const ILinkMessage* msg, SendStatusHandler handler = nullptr) = 0;
+        const RouterID& remote, const ILinkMessage& msg, SendStatusHandler handler = nullptr) = 0;
 
     virtual void
     PersistSessionUntil(const RouterID& remote, llarp_time_t until) = 0;

llarp/router/i_outbound_message_handler.hpp

@@ -32,7 +32,7 @@ namespace llarp
     virtual ~IOutboundMessageHandler() = default;
 
     virtual bool
-    QueueMessage(const RouterID& remote, const ILinkMessage* msg, SendStatusHandler callback) = 0;
+    QueueMessage(const RouterID& remote, const ILinkMessage& msg, SendStatusHandler callback) = 0;
 
     virtual void
     Tick() = 0;

llarp/router/outbound_message_handler.cpp

@@ -21,7 +21,7 @@ namespace llarp
 
   bool
   OutboundMessageHandler::QueueMessage(
-      const RouterID& remote, const ILinkMessage* msg, SendStatusHandler callback)
+      const RouterID& remote, const ILinkMessage& msg, SendStatusHandler callback)
   {
     if (not _linkManager->SessionIsClient(remote) and not _lookupHandler->RemoteIsAllowed(remote))
     {
@@ -29,7 +29,7 @@ namespace llarp
       return true;
     }
 
-    const uint16_t priority = msg->Priority();
+    const uint16_t priority = msg.Priority();
     std::array<byte_t, MAX_LINK_MSG_SIZE> linkmsg_buffer;
     llarp_buffer_t buf(linkmsg_buffer);
 
@@ -46,7 +46,7 @@ namespace llarp
 
     if (_linkManager->HasSessionTo(remote))
     {
-      QueueOutboundMessage(remote, std::move(message), msg->pathid, priority);
+      QueueOutboundMessage(remote, std::move(message), msg.pathid, priority);
       return true;
     }
 
@@ -195,9 +195,9 @@ namespace llarp
   }
 
   bool
-  OutboundMessageHandler::EncodeBuffer(const ILinkMessage* msg, llarp_buffer_t& buf)
+  OutboundMessageHandler::EncodeBuffer(const ILinkMessage& msg, llarp_buffer_t& buf)
   {
-    if (!msg->BEncode(&buf))
+    if (!msg.BEncode(&buf))
     {
       LogWarn("failed to encode outbound message, buffer size left: ", buf.size_left());
       return false;
@@ -248,10 +248,6 @@ namespace llarp
     if (outboundQueue.tryPushBack(std::move(entry)) != llarp::thread::QueueReturn::Success)
     {
       m_queueStats.dropped++;
-      LogWarn(
-          "QueueOutboundMessage outbound message handler dropped message on "
-          "pathid=",
-          pathid);
       DoCallback(callback_copy, SendStatus::Congestion);
     }
     else
@@ -288,10 +284,6 @@ namespace llarp
       }
       else
       {
-        LogWarn(
-            "ProcessOutboundQueue outbound message handler dropped message on "
-            "pathid=",
-            entry.pathid);
         DoCallback(entry.message.second, SendStatus::Congestion);
         m_queueStats.dropped++;
       }

llarp/router/outbound_message_handler.hpp

@@ -28,7 +28,7 @@ namespace llarp
     OutboundMessageHandler(size_t maxQueueSize = MAX_OUTBOUND_QUEUE_SIZE);
 
     bool
-    QueueMessage(const RouterID& remote, const ILinkMessage* msg, SendStatusHandler callback)
+    QueueMessage(const RouterID& remote, const ILinkMessage& msg, SendStatusHandler callback)
         override EXCLUDES(_mutex);
 
     void
@@ -98,7 +98,7 @@ namespace llarp
     QueueSessionCreation(const RouterID& remote);
 
     bool
-    EncodeBuffer(const ILinkMessage* msg, llarp_buffer_t& buf);
+    EncodeBuffer(const ILinkMessage& msg, llarp_buffer_t& buf);
 
     bool
     Send(const RouterID& remote, const Message& msg);

llarp/router/router.cpp

@@ -193,7 +193,7 @@ namespace llarp
   }
 
   bool
-  Router::SendToOrQueue(const RouterID& remote, const ILinkMessage* msg, SendStatusHandler handler)
+  Router::SendToOrQueue(const RouterID& remote, const ILinkMessage& msg, SendStatusHandler handler)
   {
     return _outboundMessageHandler.QueueMessage(remote, msg, handler);
   }
@@ -483,16 +483,7 @@ namespace llarp
       const auto& val = networkConfig.m_strictConnect;
       if (IsServiceNode())
         throw std::runtime_error("cannot use strict-connect option as service node");
-
-      // try as a RouterID and as a PubKey, convert to RouterID if needed
-      llarp::RouterID snode;
-      llarp::PubKey pk;
-      if (pk.FromString(val))
-        strictConnectPubkeys.emplace(pk);
-      else if (snode.FromString(val))
-        strictConnectPubkeys.insert(snode);
-      else
-        throw std::invalid_argument(stringify("invalid key for strict-connect: ", val));
+      strictConnectPubkeys.insert(val.begin(), val.end());
     }
 
     std::vector<fs::path> configRouters = conf.connect.routers;

llarp/router/router.hpp

@@ -411,7 +411,7 @@ namespace llarp
     /// MUST be called in the logic thread
     bool
     SendToOrQueue(
-        const RouterID& remote, const ILinkMessage* msg, SendStatusHandler handler) override;
+        const RouterID& remote, const ILinkMessage& msg, SendStatusHandler handler) override;
 
     void
     ForEachPeer(std::function<void(const ILinkSession*, bool)> visit, bool randomize = false)

llarp/rpc/lokid_rpc_client.cpp

@@ -37,6 +37,10 @@ namespace llarp
     {
       // m_lokiMQ->log_level(toLokiMQLogLevel(LogLevel::Instance().curLevel));
 
+      // new block handler
+      m_lokiMQ->add_category("notify", oxenmq::Access{oxenmq::AuthLevel::none})
+          .add_request_command("block", [this](oxenmq::Message& m) { HandleNewBlock(m); });
+
       // TODO: proper auth here
       auto lokidCategory = m_lokiMQ->add_category("lokid", oxenmq::Access{oxenmq::AuthLevel::none});
       lokidCategory.add_request_command(
@@ -68,14 +72,29 @@ namespace llarp
     }
 
     void
-    LokidRpcClient::UpdateServiceNodeList()
+    LokidRpcClient::HandleNewBlock(oxenmq::Message& msg)
+    {
+      if (msg.data.size() != 2)
+      {
+        LogError(
+            "we got an invalid new block notification with ",
+            msg.data.size(),
+            " parts instead of 2 parts so we will not update the list of service nodes");
+        return;  // bail
+      }
+      LogDebug("new block at hieght ", msg.data[0]);
+      UpdateServiceNodeList(std::string{msg.data[1]});
+    }
+
+    void
+    LokidRpcClient::UpdateServiceNodeList(std::string topblock)
     {
       nlohmann::json request, fields;
       fields["pubkey_ed25519"] = true;
       request["fields"] = fields;
       request["active_only"] = true;
-      if (not m_CurrentBlockHash.empty())
-        request["poll_block_hash"] = m_CurrentBlockHash;
+      if (not topblock.empty())
+        request["poll_block_hash"] = topblock;
       Request(
           "rpc.get_service_nodes",
           [self = shared_from_this()](bool success, std::vector<std::string> data) {
@@ -105,9 +124,8 @@ namespace llarp
     LokidRpcClient::Connected()
     {
       constexpr auto PingInterval = 30s;
-      constexpr auto NodeListUpdateInterval = 30s;
-
       auto makePingRequest = [self = shared_from_this()]() {
+        // send a ping
         nlohmann::json payload = {{"version", {VERSION[0], VERSION[1], VERSION[2]}}};
         self->Request(
             "admin.lokinet_ping",
@@ -116,24 +134,25 @@ namespace llarp
               LogDebug("Received response for ping. Successful: ", success);
             },
             payload.dump());
+        // subscribe to block updates
+        self->Request("sub.block", [](bool success, std::vector<std::string> data) {
+          if (data.empty() or not success)
+          {
+            LogError("failed to subscribe to new blocks");
+            return;
+          }
+          LogDebug("subscribed to new blocks: ", data[0]);
+        });
       };
       m_lokiMQ->add_timer(makePingRequest, PingInterval);
-      m_lokiMQ->add_timer(
-          [self = shared_from_this()]() { self->UpdateServiceNodeList(); }, NodeListUpdateInterval);
-      UpdateServiceNodeList();
+      // initial fetch of service node list
+      UpdateServiceNodeList("");
     }
 
     void
     LokidRpcClient::HandleGotServiceNodeList(std::string data)
     {
       auto j = nlohmann::json::parse(std::move(data));
-      {
-        const auto itr = j.find("block_hash");
-        if (itr != j.end())
-        {
-          m_CurrentBlockHash = itr->get<std::string>();
-        }
-      }
       {
         const auto itr = j.find("unchanged");
         if (itr != j.end())
@@ -165,7 +184,7 @@ namespace llarp
 
       if (nodeList.empty())
       {
-        LogWarn("got empty service node list from lokid");
+        LogWarn("got empty service node list, ignoring.");
         return;
       }
       // inform router about the new list

llarp/rpc/lokid_rpc_client.hpp

@@ -45,7 +45,7 @@ namespace llarp
       Command(std::string_view cmd);
 
       void
-      UpdateServiceNodeList();
+      UpdateServiceNodeList(std::string topblock);
 
       template <typename HandlerFunc_t, typename Args_t>
       void
@@ -68,9 +68,12 @@ namespace llarp
       void
       HandleGetPeerStats(oxenmq::Message& msg);
 
+      // Handles notification of a new block
+      void
+      HandleNewBlock(oxenmq::Message& msg);
+
       std::optional<oxenmq::ConnectionID> m_Connection;
       LMQ_ptr m_lokiMQ;
-      std::string m_CurrentBlockHash;
 
       AbstractRouter* const m_Router;
     };

llarp/service/endpoint.cpp

@@ -110,7 +110,7 @@ namespace llarp
             "could not publish descriptors for endpoint ",
             Name(),
             " because we couldn't get enough valid introductions");
-        ManualRebuild(1);
+        BuildOne();
         return;
       }
       introSet().I.clear();
@@ -179,6 +179,44 @@ namespace llarp
       return std::nullopt;
     }
 
+    void
+    Endpoint::LookupServiceAsync(
+        std::string name,
+        std::string service,
+        std::function<void(std::vector<dns::SRVData>)> resultHandler)
+    {
+      auto fail = [resultHandler]() { resultHandler({}); };
+      auto lookupByAddress = [resultHandler](auto address) {
+        if (auto* ptr = std::get_if<RouterID>(&address))
+        {}
+        else if (auto* ptr = std::get_if<Address>(&address))
+        {}
+        else
+        {
+          resultHandler({});
+        }
+      };
+      if (auto maybe = ParseAddress(name))
+      {
+        lookupByAddress(*maybe);
+      }
+      else if (NameIsValid(name))
+      {
+        LookupNameAsync(name, [lookupByAddress, fail](auto maybe) {
+          if (maybe)
+          {
+            lookupByAddress(*maybe);
+          }
+          else
+          {
+            fail();
+          }
+        });
+      }
+      else
+        fail();
+    }
+
     bool
     Endpoint::IntrosetIsStale() const
     {
@@ -835,14 +873,21 @@ namespace llarp
       LogInfo(Name(), " looking up LNS name: ", name);
       path::Path::UniqueEndpointSet_t paths;
       ForEachPath([&](auto path) {
-        if (path->IsReady())
-        {
+        if (path and path->IsReady())
           paths.insert(path);
-        }
       });
+
+      constexpr size_t min_unique_lns_endpoints = 3;
+
       // not enough paths
-      if (paths.size() < 3)
+      if (paths.size() < min_unique_lns_endpoints)
       {
+        LogWarn(
+            Name(),
+            " not enough paths for lns lookup, have ",
+            paths.size(),
+            " need ",
+            min_unique_lns_endpoints);
         handler(std::nullopt);
         return;
       }

llarp/service/endpoint.hpp

@@ -224,6 +224,12 @@ namespace llarp
           std::function<void(std::optional<std::variant<Address, RouterID>>)> resultHandler)
           override;
 
+      void
+      LookupServiceAsync(
+          std::string name,
+          std::string service,
+          std::function<void(std::vector<dns::SRVData>)> resultHandler) override;
+
       /// called on event loop pump
       virtual void
       Pump(llarp_time_t now);

llarp/service/intro_set.cpp

@@ -90,7 +90,7 @@ namespace llarp::service
     llarp_buffer_t buf(payload);
     CryptoManager::instance()->xchacha20(buf, k, nounce);
     if (not i.BDecode(&buf))
-      return {};
+      return std::nullopt;
     return i;
   }
 
@@ -177,7 +177,8 @@ namespace llarp::service
 
       byte_t* end = buf->cur;
 
-      std::string_view srvString{reinterpret_cast<char*>(begin), end - begin};
+      std::string_view srvString{
+          reinterpret_cast<char*>(begin), static_cast<std::size_t>(end - begin)};
 
       try
       {