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507 lines
11 KiB
C++
507 lines
11 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 "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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} // namespace llarp
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llarp_router::llarp_router(struct llarp_alloc *m)
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: ready(false), mem(m), inbound_msg_handler(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_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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if(inbound_msg_handler.ProcessFrom(session, buf))
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{
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return inbound_msg_handler.FlushReplies();
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}
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else
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return false;
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}
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bool
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llarp_router::ProcessLRCM(llarp::LR_CommitMessage msg)
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{
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return false;
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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(__FILE__, rcfile, " too large");
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}
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else
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{
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llarp::Error(__FILE__, "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::Info(__FILE__, "verified signature");
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if(!llarp_router_try_connect(this, &remote))
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{
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llarp::Warn(__FILE__, "session already made");
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}
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}
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else
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llarp::Error(__FILE__, "failed to verify signature of RC");
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}
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else
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llarp::Error(__FILE__, "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::Info(__FILE__, "verify RC signature");
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if(!llarp_rc_verify_sig(&crypto, &rc))
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{
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llarp::Error(__FILE__, "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(__FILE__, "RC saved to ", our_rc_file);
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return true;
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}
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}
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llarp::Error(__FILE__, "did not save RC to ", our_rc_file);
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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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}
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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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if(job->session)
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{
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llarp_rc *remote = job->session->get_remote_router(job->session);
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if(remote)
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{
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llarp_router *router = static_cast< llarp_router * >(job->user);
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llarp::pubkey pubkey;
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memcpy(&pubkey[0], remote->pubkey, 32);
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char tmp[68] = {0};
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const char *pubkeystr =
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llarp::HexEncode< decltype(pubkey), decltype(tmp) >(pubkey, tmp);
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llarp::Info(__FILE__, "session established with ", pubkeystr);
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auto itr = router->pendingMessages.find(pubkey);
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if(itr != router->pendingMessages.end())
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{
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// flush pending
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if(itr->second.size())
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{
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llarp::Info(__FILE__, pubkeystr, " flush ", itr->second.size(),
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" pending messages");
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}
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for(auto &msg : itr->second)
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{
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auto buf = llarp::Buffer< decltype(msg) >(msg);
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job->session->sendto(job->session, buf);
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}
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router->pendingMessages.erase(itr);
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}
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return;
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}
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}
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llarp::Info(__FILE__, "session not established");
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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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char tmp[68] = {0};
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llarp::pubkey ourPubkey;
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memcpy(&ourPubkey[0], pubkey(), 32);
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const char *us =
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llarp::HexEncode< llarp::pubkey, decltype(tmp) >(ourPubkey, tmp);
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llarp::Info(__FILE__, "we are ", us);
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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(__FILE__, "Link ", link->name(), " failed to start");
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else
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llarp::Info(__FILE__, "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(__FILE__, "connecting to node ", itr.first);
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try_connect(itr.second);
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}
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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 = 5000;
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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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return true;
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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_alloc *mem, struct llarp_threadpool *tp,
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struct llarp_ev_loop *netloop, struct llarp_logic *logic)
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{
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llarp_router *router = new llarp_router(mem);
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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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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)
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{
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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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{
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struct llarp_rc *rc = (llarp_rc *)iter->user;
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llarp_ai_list_pushback(rc->addrs, ai);
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return true;
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}
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void
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llarp_rc_set_addrs(struct llarp_rc *rc, struct llarp_alloc *mem,
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struct llarp_ai_list *addr)
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{
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rc->addrs = llarp_ai_list_new();
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struct llarp_ai_list_iter ai_itr;
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ai_itr.user = rc;
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ai_itr.visit = &llarp_rc_addr_list_iter;
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llarp_ai_list_iterate(addr, &ai_itr);
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}
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void
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llarp_rc_set_pubkey(struct llarp_rc *rc, uint8_t *pubkey)
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{
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// set public key
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memcpy(rc->pubkey, pubkey, 32);
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}
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bool
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llarp_findOrCreateIdentity(llarp_crypto *crypto, const char *fpath,
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byte_t *secretkey)
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{
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fs::path path(fpath);
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std::error_code ec;
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if(!fs::exists(path, ec))
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{
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crypto->identity_keygen(secretkey);
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std::ofstream f(path, std::ios::binary);
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if(f.is_open())
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{
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f.write((char *)secretkey, sizeof(llarp_seckey_t));
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}
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}
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std::ifstream f(path, std::ios::binary);
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if(f.is_open())
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{
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f.read((char *)secretkey, sizeof(llarp_seckey_t));
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return true;
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}
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return false;
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}
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bool
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llarp_rc_write(struct llarp_rc *rc, const char *fpath)
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{
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fs::path our_rc_file(fpath);
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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, std::ios::binary);
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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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return true;
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}
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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_sign(llarp_crypto *crypto, const byte_t *seckey, struct llarp_rc *rc)
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{
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byte_t buf[MAX_RC_SIZE];
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auto signbuf = llarp::StackBuffer< decltype(buf) >(buf);
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// zero out previous signature
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llarp::Zero(rc->signature, sizeof(rc->signature));
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// encode
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if(llarp_rc_bencode(rc, &signbuf))
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{
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// sign
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signbuf.sz = signbuf.cur - signbuf.base;
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crypto->sign(rc->signature, seckey, signbuf);
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}
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}
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void
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llarp_stop_router(struct llarp_router *router)
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{
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if(router)
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router->Close();
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}
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void
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llarp_router_iterate_links(struct llarp_router *router,
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struct llarp_router_link_iter i)
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{
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for(auto link : router->links)
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if(!i.visit(&i, router, link))
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return;
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}
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void
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llarp_free_router(struct llarp_router **router)
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{
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if(*router)
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{
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for(auto &link : (*router)->links)
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{
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link->free_impl(link);
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delete link;
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}
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delete *router;
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}
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*router = nullptr;
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}
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}
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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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{
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llarp_router *self = static_cast< llarp_router * >(iter->user);
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int af;
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uint16_t proto;
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if(StrEq(val, "eth"))
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{
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af = AF_PACKET;
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proto = LLARP_ETH_PROTO;
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}
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else
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{
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af = AF_INET6;
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proto = std::atoi(val);
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}
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struct llarp_link *link = nullptr;
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if(StrEq(section, "iwp-links"))
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{
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link = new llarp_link;
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llarp::Zero(link, sizeof(llarp_link));
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llarp_iwp_args args = {
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.crypto = &self->crypto,
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.logic = self->logic,
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.cryptoworker = self->tp,
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.router = self,
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.keyfile = self->transport_keyfile.c_str(),
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};
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iwp_link_init(link, args);
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if(llarp_link_initialized(link))
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{
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if(link->configure(link, self->netloop, key, af, proto))
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{
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llarp_ai ai;
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link->get_our_address(link, &ai);
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llarp::Addr addr = ai;
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self->AddLink(link);
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return;
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}
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}
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llarp::Error(__FILE__, "link ", key, " failed to configure");
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}
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else if(StrEq(section, "iwp-connect"))
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{
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self->connect[key] = val;
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}
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else if(StrEq(section, "router"))
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{
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if(StrEq(key, "contact-file"))
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{
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self->our_rc_file = val;
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}
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if(StrEq(key, "transport-privkey"))
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{
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self->transport_keyfile = val;
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}
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if(StrEq(key, "ident-privkey"))
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{
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self->ident_keyfile = val;
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}
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}
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}
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} // namespace llarp
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