mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
769 lines
17 KiB
C++
769 lines
17 KiB
C++
#include "router.hpp"
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#include <llarp/iwp.h>
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#include <llarp/link.h>
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#include <llarp/proto.h>
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#include <llarp/router.h>
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#include <llarp/link_message.hpp>
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#include <llarp/messages/discard.hpp>
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#include "buffer.hpp"
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#include "encode.hpp"
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#include "logger.hpp"
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#include "net.hpp"
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#include "str.hpp"
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#include <fstream>
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namespace llarp
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{
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void
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router_iter_config(llarp_config_iterator *iter, const char *section,
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const char *key, const char *val);
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struct async_verify_context
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{
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llarp_router *router;
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llarp_link_establish_job *establish_job;
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};
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} // namespace llarp
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llarp_router::llarp_router()
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: ready(false), dht(llarp_dht_context_new(this)), inbound_msg_parser(this)
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{
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llarp_rc_clear(&rc);
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}
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llarp_router::~llarp_router()
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{
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llarp_dht_context_free(dht);
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llarp_rc_free(&rc);
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}
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bool
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llarp_router::HandleRecvLinkMessage(llarp_link_session *session,
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llarp_buffer_t buf)
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{
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return inbound_msg_parser.ProcessFrom(session, buf);
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}
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bool
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llarp_router::SendToOrQueue(const llarp::RouterID &remote,
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std::vector< llarp::ILinkMessage * > msgs)
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{
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bool has = false;
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for(auto &link : links)
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has |= link->has_session_to(link, remote);
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if(!has)
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{
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llarp_rc rc;
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llarp_rc_clear(&rc);
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llarp_pubkey_t k;
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memcpy(k, remote, sizeof(llarp_pubkey_t));
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if(!llarp_nodedb_find_rc(nodedb, &rc, k))
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{
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llarp::Warn("cannot find router ", remote, " locally so we are dropping ",
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msgs.size(), " messages to them");
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for(auto &msg : msgs)
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delete msg;
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msgs.clear();
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return false;
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}
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for(const auto &msg : msgs)
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{
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// this will create an entry in the obmq if it's not already there
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outboundMesssageQueue[remote].push(msg);
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}
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// queued
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llarp_router_try_connect(this, &rc);
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llarp_rc_clear(&rc);
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return true;
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}
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for(const auto &msg : msgs)
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{
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outboundMesssageQueue[remote].push(msg);
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}
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FlushOutboundFor(remote);
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return true;
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}
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void
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llarp_router::try_connect(fs::path rcfile)
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{
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byte_t tmp[MAX_RC_SIZE];
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llarp_rc remote = {0};
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llarp_buffer_t buf;
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llarp::StackBuffer< decltype(tmp) >(buf, tmp);
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// open file
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{
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std::ifstream f(rcfile, std::ios::binary);
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if(f.is_open())
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{
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f.seekg(0, std::ios::end);
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size_t sz = f.tellg();
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f.seekg(0, std::ios::beg);
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if(sz <= buf.sz)
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{
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f.read((char *)buf.base, sz);
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}
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else
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llarp::Error(rcfile, " too large");
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}
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else
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{
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llarp::Error("failed to open ", rcfile);
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return;
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}
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}
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if(llarp_rc_bdecode(&remote, &buf))
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{
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if(llarp_rc_verify_sig(&crypto, &remote))
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{
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llarp::Debug("verified signature");
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if(!llarp_router_try_connect(this, &remote))
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{
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llarp::Warn("session already made");
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}
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}
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else
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llarp::Error("failed to verify signature of RC");
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}
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else
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llarp::Error("failed to decode RC");
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llarp_rc_free(&remote);
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}
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bool
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llarp_router::EnsureIdentity()
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{
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return llarp_findOrCreateIdentity(&crypto, ident_keyfile.c_str(), identity);
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}
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void
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llarp_router::AddLink(struct llarp_link *link)
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{
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links.push_back(link);
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ready = true;
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}
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bool
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llarp_router::Ready()
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{
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return ready;
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}
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bool
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llarp_router::SaveRC()
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{
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llarp::Debug("verify RC signature");
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if(!llarp_rc_verify_sig(&crypto, &rc))
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{
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llarp::Error("RC has bad signature not saving");
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return false;
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}
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byte_t tmp[MAX_RC_SIZE];
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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if(llarp_rc_bencode(&rc, &buf))
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{
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std::ofstream f(our_rc_file);
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if(f.is_open())
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{
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f.write((char *)buf.base, buf.cur - buf.base);
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llarp::Info("our RC saved to ", our_rc_file.c_str());
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return true;
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}
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}
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llarp::Error("did not save RC to ", our_rc_file.c_str());
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return false;
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}
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void
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llarp_router::Close()
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{
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for(auto &link : links)
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{
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link->stop_link(link);
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link->free_impl(link);
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delete link;
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}
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links.clear();
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}
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void
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llarp_router::connect_job_retry(void *user)
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{
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llarp_link_establish_job *job =
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static_cast< llarp_link_establish_job * >(user);
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llarp::Info("trying to establish session again");
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job->link->try_establish(job->link, job);
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}
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void
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llarp_router::on_verify_client_rc(llarp_async_verify_rc *job)
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{
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llarp::async_verify_context *ctx =
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static_cast< llarp::async_verify_context * >(job->user);
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llarp_rc_free(&job->rc);
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delete ctx;
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}
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void
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llarp_router::on_verify_server_rc(llarp_async_verify_rc *job)
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{
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llarp::async_verify_context *ctx =
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static_cast< llarp::async_verify_context * >(job->user);
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auto router = ctx->router;
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if(!job->valid)
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{
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llarp::Warn("invalid server RC");
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if(ctx->establish_job)
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{
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// was an outbound attempt
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auto session = ctx->establish_job->session;
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if(session)
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session->close(session);
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delete ctx->establish_job;
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}
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llarp_rc_free(&job->rc);
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delete job;
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return;
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}
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llarp::Debug("rc verified");
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// track valid router in dht
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llarp::pubkey pubkey;
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memcpy(&pubkey[0], job->rc.pubkey, pubkey.size());
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// refresh valid routers RC value if it's there
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auto v = router->validRouters.find(pubkey);
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if(v != router->validRouters.end())
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{
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// free previous RC members
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llarp_rc_free(&v->second);
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}
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router->validRouters[pubkey] = job->rc;
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// track valid router in dht
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llarp_dht_put_local_router(router->dht, &router->validRouters[pubkey]);
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// this was an outbound establish job
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if(ctx->establish_job->session)
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{
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router->FlushOutboundFor(pubkey);
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}
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llarp_rc_free(&job->rc);
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delete job;
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}
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void
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llarp_router::handle_router_ticker(void *user, 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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llarp_router *self = static_cast< llarp_router * >(user);
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self->ticker_job_id = 0;
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self->Tick();
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self->ScheduleTicker(orig);
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}
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void
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llarp_router::Tick()
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{
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llarp::Debug("tick router");
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llarp_link_session_iter iter;
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iter.user = this;
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iter.visit = &send_padded_message;
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if(sendPadding)
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{
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for(auto link : links)
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{
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link->iter_sessions(link, iter);
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}
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}
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}
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bool
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llarp_router::send_padded_message(llarp_link_session_iter *itr,
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llarp_link_session *peer)
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{
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llarp_router *self = static_cast< llarp_router * >(itr->user);
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llarp::RouterID remote;
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remote = &peer->get_remote_router(peer)->pubkey[0];
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for(size_t idx = 0; idx < 50; ++idx)
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{
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llarp::DiscardMessage msg(9000);
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self->SendTo(remote, &msg);
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}
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return true;
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}
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void
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llarp_router::SendTo(llarp::RouterID remote, llarp::ILinkMessage *msg)
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{
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llarp_buffer_t buf =
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llarp::StackBuffer< decltype(linkmsg_buffer) >(linkmsg_buffer);
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if(!msg->BEncode(&buf))
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{
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llarp::Warn("failed to encode outbound message, buffer size left: ",
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llarp_buffer_size_left(buf));
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return;
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}
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// set size of message
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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bool sent = false;
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for(auto link : links)
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{
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if(!sent)
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{
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sent = link->sendto(link, remote, buf);
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}
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}
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}
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void
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llarp_router::ScheduleTicker(uint64_t ms)
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{
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ticker_job_id =
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llarp_logic_call_later(logic, {ms, this, &handle_router_ticker});
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}
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void
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llarp_router::SessionClosed(const llarp::RouterID &remote)
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{
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// remove from valid routers and dht if it's a valid router
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auto itr = validRouters.find(remote);
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if(itr == validRouters.end())
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return;
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llarp_dht_remove_local_router(dht, remote);
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llarp_rc_free(&itr->second);
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validRouters.erase(itr);
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}
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void
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llarp_router::FlushOutboundFor(const llarp::RouterID &remote)
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{
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llarp::Debug("Flush outbound for ", remote);
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auto itr = outboundMesssageQueue.find(remote);
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if(itr == outboundMesssageQueue.end())
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return;
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while(itr->second.size())
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{
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auto buf = llarp::StackBuffer< decltype(linkmsg_buffer) >(linkmsg_buffer);
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auto &msg = itr->second.front();
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if(!msg->BEncode(&buf))
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{
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llarp::Warn("failed to encode outbound message, buffer size left: ",
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llarp_buffer_size_left(buf));
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delete msg;
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itr->second.pop();
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continue;
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}
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// set size of message
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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llarp::RouterID peer = remote;
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bool sent = false;
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for(auto &link : links)
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{
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if(!sent)
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{
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sent = link->sendto(link, peer, buf);
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}
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}
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if(!sent)
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{
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llarp::Warn("failed to flush outboud message queue for ", remote);
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}
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delete msg;
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itr->second.pop();
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}
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}
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void
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llarp_router::on_try_connect_result(llarp_link_establish_job *job)
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{
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llarp_router *router = static_cast< llarp_router * >(job->user);
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if(job->session)
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{
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delete job;
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/*
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auto session = job->session;
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router->async_verify_RC(session, false, job);
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*/
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return;
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}
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llarp::Info("session not established");
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llarp_logic_queue_job(router->logic, {job, &llarp_router::connect_job_retry});
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}
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void
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llarp_router::async_verify_RC(llarp_link_session *session,
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bool isExpectingClient,
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llarp_link_establish_job *establish_job)
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{
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llarp_async_verify_rc *job = new llarp_async_verify_rc{
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new llarp::async_verify_context{this, establish_job},
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{},
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false,
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nullptr,
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};
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llarp_rc_copy(&job->rc, session->get_remote_router(session));
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if(isExpectingClient)
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job->hook = &llarp_router::on_verify_client_rc;
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else
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job->hook = &llarp_router::on_verify_server_rc;
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llarp_nodedb_async_verify(nodedb, logic, &crypto, tp, disk, job);
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}
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void
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llarp_router::Run()
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{
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// zero out router contact
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llarp::Zero(&rc, sizeof(llarp_rc));
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// fill our address list
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rc.addrs = llarp_ai_list_new();
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for(auto link : links)
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{
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llarp_ai addr;
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link->get_our_address(link, &addr);
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llarp_ai_list_pushback(rc.addrs, &addr);
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};
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// set public key
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llarp_rc_set_pubkey(&rc, pubkey());
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llarp_rc_sign(&crypto, identity, &rc);
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if(!SaveRC())
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{
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return;
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}
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llarp::pubkey ourPubkey = pubkey();
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llarp::Info("our router has public key ", ourPubkey);
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llarp_dht_context_start(dht, ourPubkey);
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// start links
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for(auto link : links)
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{
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int result = link->start_link(link, logic);
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if(result == -1)
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llarp::Warn("Link ", link->name(), " failed to start");
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else
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llarp::Debug("Link ", link->name(), " started");
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}
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for(const auto &itr : connect)
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{
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llarp::Info("connecting to node ", itr.first);
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try_connect(itr.second);
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}
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ScheduleTicker(500);
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}
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bool
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llarp_router::iter_try_connect(llarp_router_link_iter *iter,
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llarp_router *router, llarp_link *link)
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{
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if(!link)
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return true;
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llarp_link_establish_job *job = new llarp_link_establish_job;
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if(!job)
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return true;
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llarp_ai *ai = static_cast< llarp_ai * >(iter->user);
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llarp_ai_copy(&job->ai, ai);
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job->timeout = 10000;
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job->result = &llarp_router::on_try_connect_result;
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// give router as user pointer
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job->user = router;
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link->try_establish(link, job);
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// break iteration
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return false;
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}
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extern "C" {
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struct llarp_router *
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llarp_init_router(struct llarp_threadpool *tp, struct llarp_ev_loop *netloop,
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struct llarp_logic *logic)
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{
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llarp_router *router = new llarp_router();
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if(router)
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{
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router->netloop = netloop;
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router->tp = tp;
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router->logic = logic;
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// TODO: make disk io threadpool count configurable
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router->disk = llarp_init_threadpool(1, "llarp-diskio");
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llarp_crypto_libsodium_init(&router->crypto);
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}
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return router;
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}
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bool
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llarp_configure_router(struct llarp_router *router, struct llarp_config *conf)
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{
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llarp_config_iterator iter;
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iter.user = router;
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iter.visit = llarp::router_iter_config;
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llarp_config_iter(conf, &iter);
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if(!router->Ready())
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{
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return false;
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}
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return router->EnsureIdentity();
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}
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void
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llarp_run_router(struct llarp_router *router, struct llarp_nodedb *nodedb)
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{
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router->nodedb = nodedb;
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router->Run();
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}
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bool
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llarp_router_try_connect(struct llarp_router *router, struct llarp_rc *remote)
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{
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// try first address only
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llarp_ai addr;
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if(llarp_ai_list_index(remote->addrs, 0, &addr))
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{
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llarp_router_iterate_links(router,
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{&addr, &llarp_router::iter_try_connect});
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return true;
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}
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return false;
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}
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void
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llarp_rc_clear(struct llarp_rc *rc)
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{
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// zero out router contact
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llarp::Zero(rc, sizeof(llarp_rc));
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}
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bool
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llarp_rc_addr_list_iter(struct llarp_ai_list_iter *iter, struct llarp_ai *ai)
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{
|
|
struct llarp_rc *rc = (llarp_rc *)iter->user;
|
|
llarp_ai_list_pushback(rc->addrs, ai);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
llarp_rc_set_addrs(struct llarp_rc *rc, struct llarp_alloc *mem,
|
|
struct llarp_ai_list *addr)
|
|
{
|
|
rc->addrs = llarp_ai_list_new();
|
|
struct llarp_ai_list_iter ai_itr;
|
|
ai_itr.user = rc;
|
|
ai_itr.visit = &llarp_rc_addr_list_iter;
|
|
llarp_ai_list_iterate(addr, &ai_itr);
|
|
}
|
|
|
|
void
|
|
llarp_rc_set_pubkey(struct llarp_rc *rc, uint8_t *pubkey)
|
|
{
|
|
// set public key
|
|
memcpy(rc->pubkey, pubkey, 32);
|
|
}
|
|
|
|
bool
|
|
llarp_findOrCreateIdentity(llarp_crypto *crypto, const char *fpath,
|
|
byte_t *secretkey)
|
|
{
|
|
fs::path path(fpath);
|
|
std::error_code ec;
|
|
if(!fs::exists(path, ec))
|
|
{
|
|
crypto->identity_keygen(secretkey);
|
|
std::ofstream f(path, std::ios::binary);
|
|
if(f.is_open())
|
|
{
|
|
f.write((char *)secretkey, sizeof(llarp_seckey_t));
|
|
}
|
|
}
|
|
std::ifstream f(path, std::ios::binary);
|
|
if(f.is_open())
|
|
{
|
|
f.read((char *)secretkey, sizeof(llarp_seckey_t));
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
llarp_rc_write(struct llarp_rc *rc, const char *fpath)
|
|
{
|
|
fs::path our_rc_file(fpath);
|
|
byte_t tmp[MAX_RC_SIZE];
|
|
auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
|
|
|
|
if(llarp_rc_bencode(rc, &buf))
|
|
{
|
|
std::ofstream f(our_rc_file, std::ios::binary);
|
|
if(f.is_open())
|
|
{
|
|
f.write((char *)buf.base, buf.cur - buf.base);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void
|
|
llarp_rc_sign(llarp_crypto *crypto, const byte_t *seckey, struct llarp_rc *rc)
|
|
{
|
|
byte_t buf[MAX_RC_SIZE];
|
|
auto signbuf = llarp::StackBuffer< decltype(buf) >(buf);
|
|
// zero out previous signature
|
|
llarp::Zero(rc->signature, sizeof(rc->signature));
|
|
// encode
|
|
if(llarp_rc_bencode(rc, &signbuf))
|
|
{
|
|
// sign
|
|
signbuf.sz = signbuf.cur - signbuf.base;
|
|
crypto->sign(rc->signature, seckey, signbuf);
|
|
}
|
|
}
|
|
|
|
void
|
|
llarp_stop_router(struct llarp_router *router)
|
|
{
|
|
if(router)
|
|
router->Close();
|
|
}
|
|
|
|
void
|
|
llarp_router_iterate_links(struct llarp_router *router,
|
|
struct llarp_router_link_iter i)
|
|
{
|
|
for(auto link : router->links)
|
|
if(!i.visit(&i, router, link))
|
|
return;
|
|
}
|
|
|
|
void
|
|
llarp_free_router(struct llarp_router **router)
|
|
{
|
|
if(*router)
|
|
{
|
|
delete *router;
|
|
}
|
|
*router = nullptr;
|
|
}
|
|
}
|
|
|
|
namespace llarp
|
|
{
|
|
void
|
|
router_iter_config(llarp_config_iterator *iter, const char *section,
|
|
const char *key, const char *val)
|
|
{
|
|
llarp_router *self = static_cast< llarp_router * >(iter->user);
|
|
int af;
|
|
uint16_t proto;
|
|
if(StrEq(val, "eth"))
|
|
{
|
|
#ifdef AF_LINK
|
|
af = AF_LINK;
|
|
#endif
|
|
#ifdef AF_PACKET
|
|
af = AF_PACKET;
|
|
#endif
|
|
proto = LLARP_ETH_PROTO;
|
|
}
|
|
else
|
|
{
|
|
// try IPv4 first
|
|
af = AF_INET;
|
|
proto = std::atoi(val);
|
|
}
|
|
|
|
struct llarp_link *link = nullptr;
|
|
if(StrEq(section, "iwp-links"))
|
|
{
|
|
link = new llarp_link;
|
|
llarp::Zero(link, sizeof(llarp_link));
|
|
|
|
llarp_iwp_args args = {
|
|
.crypto = &self->crypto,
|
|
.logic = self->logic,
|
|
.cryptoworker = self->tp,
|
|
.router = self,
|
|
.keyfile = self->transport_keyfile.c_str(),
|
|
};
|
|
iwp_link_init(link, args);
|
|
if(llarp_link_initialized(link))
|
|
{
|
|
// printf("router -> link initialized\n");
|
|
if(link->configure(link, self->netloop, key, af, proto))
|
|
{
|
|
llarp_ai ai;
|
|
link->get_our_address(link, &ai);
|
|
llarp::Addr addr = ai;
|
|
self->AddLink(link);
|
|
return;
|
|
}
|
|
if(af == AF_INET6)
|
|
{
|
|
// we failed to configure IPv6
|
|
// try IPv4
|
|
llarp::Info("link ", key, " failed to configure IPv6, trying IPv4");
|
|
af = AF_INET;
|
|
if(link->configure(link, self->netloop, key, af, proto))
|
|
{
|
|
llarp_ai ai;
|
|
link->get_our_address(link, &ai);
|
|
llarp::Addr addr = ai;
|
|
self->AddLink(link);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
llarp::Error("link ", key, " failed to configure");
|
|
}
|
|
else if(StrEq(section, "iwp-connect"))
|
|
{
|
|
self->connect[key] = val;
|
|
}
|
|
else if(StrEq(section, "router"))
|
|
{
|
|
if(StrEq(key, "contact-file"))
|
|
{
|
|
self->our_rc_file = val;
|
|
}
|
|
if(StrEq(key, "transport-privkey"))
|
|
{
|
|
self->transport_keyfile = val;
|
|
}
|
|
if(StrEq(key, "ident-privkey"))
|
|
{
|
|
self->ident_keyfile = val;
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace llarp
|