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500 lines
11 KiB
C++
500 lines
11 KiB
C++
#pragma once
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#include "llarp/iwp.h"
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#include "llarp/iwp/establish_job.hpp"
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#include "router.hpp"
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#include "session.hpp"
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#include "str.hpp"
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#include <algorithm>
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#include <fstream>
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#include <mutex>
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struct llarp_link
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{
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typedef std::mutex mtx_t;
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typedef std::lock_guard< mtx_t > lock_t;
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llarp_router *router;
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llarp_crypto *crypto;
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llarp_logic *logic;
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llarp_ev_loop *netloop;
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llarp_async_iwp *iwp;
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llarp_threadpool *worker;
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llarp_link *parent = nullptr;
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llarp_udp_io udp;
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llarp::Addr addr;
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char keyfile[255];
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uint32_t timeout_job_id;
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const char *
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name() const
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{
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return m_name;
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}
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const char *m_name;
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typedef std::unordered_map< llarp::Addr, llarp_link_session *,
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llarp::addrhash >
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LinkMap_t;
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LinkMap_t m_sessions;
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mtx_t m_sessions_Mutex;
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typedef std::unordered_map< llarp::PubKey, llarp::Addr, llarp::PubKeyHash >
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SessionMap_t;
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SessionMap_t m_Connected;
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mtx_t m_Connected_Mutex;
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std::atomic< bool > pumpingLogic;
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typedef std::unordered_map< llarp::Addr, llarp_link_session *,
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llarp::addrhash >
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PendingSessionMap_t;
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PendingSessionMap_t m_PendingSessions;
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mtx_t m_PendingSessions_Mutex;
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llarp::SecretKey seckey;
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llarp_link(const llarp_iwp_args &args)
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: router(args.router)
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, crypto(args.crypto)
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, logic(args.logic)
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, worker(args.cryptoworker)
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, m_name("IWP")
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{
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strncpy(keyfile, args.keyfile, sizeof(keyfile));
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iwp = llarp_async_iwp_new(crypto, logic, worker);
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pumpingLogic.store(false);
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}
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~llarp_link()
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{
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llarp_async_iwp_free(iwp);
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}
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bool
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has_intro_from(const llarp::Addr &from)
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{
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std::unique_lock< std::mutex > lock(m_PendingSessions_Mutex);
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return m_PendingSessions.find(from) != m_PendingSessions.end();
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}
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void
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put_intro_from(llarp_link_session *s)
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{
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std::unique_lock< std::mutex > lock(m_PendingSessions_Mutex);
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m_PendingSessions[s->addr] = s;
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}
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void
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remove_intro_from(const llarp::Addr &from)
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{
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std::unique_lock< std::mutex > lock(m_PendingSessions_Mutex);
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m_PendingSessions.erase(from);
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}
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// set that src address has identity pubkey
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void
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MapAddr(const llarp::Addr &src, const llarp::PubKey &identity)
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{
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lock_t lock(m_Connected_Mutex);
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m_Connected[identity] = src;
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}
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static bool
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has_session_to(llarp_link *serv, const byte_t *pubkey)
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{
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llarp::PubKey pk(pubkey);
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lock_t lock(serv->m_Connected_Mutex);
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return serv->m_Connected.find(pk) != serv->m_Connected.end();
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}
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void
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TickSessions()
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{
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auto now = llarp_time_now_ms();
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std::set< llarp::Addr > remove;
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{
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lock_t lock(m_sessions_Mutex);
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for(auto &itr : m_sessions)
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{
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llarp_link_session *s = itr.second;
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if(s && s->Tick(now))
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remove.insert(itr.first);
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}
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}
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for(const auto &addr : remove)
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RemoveSessionByAddr(addr);
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{
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lock_t lock(m_PendingSessions_Mutex);
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auto itr = m_PendingSessions.begin();
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while(itr != m_PendingSessions.end())
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{
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if(itr->second->timedout(now))
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{
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itr = m_PendingSessions.erase(itr);
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}
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else
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++itr;
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}
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}
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}
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static bool
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sendto(llarp_link *serv, const byte_t *pubkey, llarp_buffer_t buf)
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{
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// lock_t lock(serv->m_Connected_Mutex);
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auto itr = serv->m_Connected.find(pubkey);
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if(itr != serv->m_Connected.end())
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{
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// lock_t innerlock(serv->m_sessions_Mutex);
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auto inner_itr = serv->m_sessions.find(itr->second);
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if(inner_itr != serv->m_sessions.end())
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{
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llarp_link_session *link = inner_itr->second;
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return link->sendto(buf);
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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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UnmapAddr(const llarp::Addr &src)
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{
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lock_t lock(m_Connected_Mutex);
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// std::unordered_map< llarp::pubkey, llarp::Addr, llarp::pubkeyhash >
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auto itr = std::find_if(
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m_Connected.begin(), m_Connected.end(),
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[src](const std::pair< llarp::PubKey, llarp::Addr > &item) -> bool {
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return src == item.second;
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});
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if(itr == std::end(m_Connected))
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return;
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// tell router we are done with this session
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router->SessionClosed(itr->first);
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m_Connected.erase(itr);
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}
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llarp_link_session *
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create_session(const llarp::Addr &src)
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{
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return new llarp_link_session(this, seckey, src);
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}
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bool
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has_session_to(const llarp::Addr &dst)
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{
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lock_t lock(m_sessions_Mutex);
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return m_sessions.find(dst) != m_sessions.end();
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}
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llarp_link_session *
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find_session(const llarp::Addr &addr)
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{
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lock_t lock(m_sessions_Mutex);
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auto itr = m_sessions.find(addr);
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if(itr == m_sessions.end())
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return nullptr;
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else
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return itr->second;
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}
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void
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put_session(const llarp::Addr &src, llarp_link_session *impl)
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{
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lock_t lock(m_sessions_Mutex);
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m_sessions.emplace(src, impl);
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impl->our_router = &router->rc;
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}
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void
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clear_sessions()
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{
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lock_t lock(m_sessions_Mutex);
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auto itr = m_sessions.begin();
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while(itr != m_sessions.end())
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{
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delete itr->second;
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itr = m_sessions.erase(itr);
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}
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}
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/// safe iterate sessions
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void
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iterate_sessions(std::function< bool(llarp_link_session *) > visitor)
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{
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std::list< llarp_link_session * > slist;
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{
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lock_t lock(m_sessions_Mutex);
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for(const auto &itr : m_sessions)
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{
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slist.push_back(itr.second);
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}
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}
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for(auto s : slist)
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if(!visitor(s))
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return;
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}
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static void
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handle_logic_pump(void *user)
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{
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llarp_link *self = static_cast< llarp_link * >(user);
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self->iterate_sessions([](llarp_link_session *s) -> bool {
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s->TickLogic();
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return true;
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});
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self->pumpingLogic = false;
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}
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void
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PumpLogic()
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{
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if(pumpingLogic)
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return;
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pumpingLogic = true;
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llarp_logic_queue_job(logic, {this, &handle_logic_pump});
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}
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void
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RemoveSessionByAddr(const llarp::Addr &addr)
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{
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lock_t lock(m_sessions_Mutex);
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auto itr = m_sessions.find(addr);
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if(itr != m_sessions.end())
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{
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llarp::LogDebug("removing session ", addr);
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UnmapAddr(addr);
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llarp_link_session *s = itr->second;
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s->done();
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m_sessions.erase(itr);
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delete s;
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}
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}
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uint8_t *
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pubkey()
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{
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return llarp::seckey_topublic(seckey);
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}
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bool
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ensure_privkey()
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{
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llarp::LogDebug("ensure transport private key at ", keyfile);
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std::error_code ec;
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if(!fs::exists(keyfile, ec))
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{
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if(!keygen(keyfile))
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return false;
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}
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std::ifstream f(keyfile);
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if(f.is_open())
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{
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f.read((char *)seckey.data(), seckey.size());
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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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keygen(const char *fname)
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{
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crypto->encryption_keygen(seckey);
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llarp::LogInfo("new transport key generated");
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std::ofstream f(fname);
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if(f.is_open())
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{
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f.write((char *)seckey.data(), seckey.size());
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return true;
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}
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return false;
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}
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static void
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handle_cleanup_timer(void *l, 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_link *link = static_cast< llarp_link * >(l);
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link->timeout_job_id = 0;
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link->TickSessions();
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link->issue_cleanup_timer(orig);
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}
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// this is called in net threadpool
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static void
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handle_recvfrom(struct llarp_udp_io *udp, const struct sockaddr *saddr,
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const void *buf, ssize_t sz)
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{
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llarp_link *link = static_cast< llarp_link * >(udp->user);
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llarp_link_session *s = link->find_session(*saddr);
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if(s == nullptr)
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{
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// new inbound session
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s = link->create_session(*saddr);
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}
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s->recv(buf, sz);
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}
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void
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cancel_timer()
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{
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if(timeout_job_id)
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{
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llarp_logic_cancel_call(logic, timeout_job_id);
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}
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timeout_job_id = 0;
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}
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void
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issue_cleanup_timer(uint64_t timeout)
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{
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timeout_job_id = llarp_logic_call_later(
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logic, {timeout, this, &llarp_link::handle_cleanup_timer});
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}
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void
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get_our_address(struct llarp_ai *addr)
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{
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addr->rank = 1;
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strncpy(addr->dialect, "IWP", sizeof(addr->dialect));
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memcpy(addr->enc_key, pubkey(), 32);
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memcpy(addr->ip.s6_addr, this->addr.addr6(), 16);
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addr->port = this->addr.port();
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}
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static void
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after_recv(llarp_udp_io *udp)
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{
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llarp_link *self = static_cast< llarp_link * >(udp->user);
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self->PumpLogic();
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}
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bool
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configure(struct llarp_ev_loop *netloop, const char *ifname, int af,
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uint16_t port)
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{
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if(!ensure_privkey())
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{
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llarp::LogError("failed to ensure private key");
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return false;
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}
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llarp::LogDebug("configure link ifname=", ifname, " af=", af,
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" port=", port);
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// bind
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sockaddr_in ip4addr;
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sockaddr_in6 ip6addr;
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sockaddr *addr = nullptr;
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switch(af)
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{
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case AF_INET:
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addr = (sockaddr *)&ip4addr;
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llarp::Zero(addr, sizeof(ip4addr));
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break;
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case AF_INET6:
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addr = (sockaddr *)&ip6addr;
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llarp::Zero(addr, sizeof(ip6addr));
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break;
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// TODO: AF_PACKET
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default:
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llarp::LogError(__FILE__, "unsupported address family", af);
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return false;
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}
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addr->sa_family = af;
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if(!llarp::StrEq(ifname, "*"))
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{
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if(!llarp_getifaddr(ifname, af, addr))
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{
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llarp::LogError("failed to get address of network interface ", ifname);
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return false;
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}
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}
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else
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m_name = "OWP"; // outboundLink_name;
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switch(af)
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{
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case AF_INET:
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ip4addr.sin_port = htons(port);
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break;
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case AF_INET6:
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ip6addr.sin6_port = htons(port);
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break;
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// TODO: AF_PACKET
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default:
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return false;
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}
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this->addr = *addr;
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this->netloop = netloop;
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udp.recvfrom = &llarp_link::handle_recvfrom;
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udp.user = this;
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udp.tick = &llarp_link::after_recv;
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llarp::LogDebug("bind IWP link to ", addr);
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if(llarp_ev_add_udp(netloop, &udp, addr) == -1)
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{
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llarp::LogError("failed to bind to ", addr);
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return false;
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}
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return true;
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}
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bool
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start_link(struct llarp_logic *pLogic)
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{
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// give link implementations
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// link->parent = l;
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timeout_job_id = 0;
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this->logic = pLogic;
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// start cleanup timer
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issue_cleanup_timer(500);
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return true;
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}
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bool
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stop_link()
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{
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cancel_timer();
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llarp_ev_close_udp(&udp);
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clear_sessions();
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return true;
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}
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bool
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try_establish(struct llarp_link_establish_job *job)
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{
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llarp::Addr dst(job->ai);
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llarp::LogDebug("establish session to ", dst);
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llarp_link_session *s = find_session(dst);
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if(s == nullptr)
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{
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s = create_session(dst);
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put_session(dst, s);
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}
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else
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return false;
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s->establish_job = job;
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s->frame.alive(); // mark it alive
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s->introduce(job->ai.enc_key);
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return true;
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}
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void
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mark_session_active(llarp_link_session *s)
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{
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s->frame.alive();
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}
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};
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