2018-09-04 12:41:25 +00:00
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#include <llarp/link/utp.hpp>
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#include "router.hpp"
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#include <llarp/messages/link_intro.hpp>
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2018-09-06 20:31:58 +00:00
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#include <llarp/messages/discard.hpp>
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2018-09-04 12:41:25 +00:00
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#include <llarp/buffer.hpp>
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#include <llarp/endian.h>
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#include <utp.h>
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2018-09-06 11:46:19 +00:00
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#include <cassert>
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2018-09-07 17:41:49 +00:00
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#include <tuple>
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2018-09-07 20:36:06 +00:00
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#include <deque>
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2018-09-04 12:41:25 +00:00
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2018-09-06 20:31:58 +00:00
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#ifdef __linux__
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#include <linux/errqueue.h>
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#include <netinet/ip_icmp.h>
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#endif
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2018-09-04 12:41:25 +00:00
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namespace llarp
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{
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namespace utp
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{
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2018-09-06 20:31:58 +00:00
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constexpr size_t FragmentHashSize = 32;
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constexpr size_t FragmentNonceSize = 24;
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2018-09-04 12:41:25 +00:00
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constexpr size_t FragmentOverheadSize =
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FragmentHashSize + FragmentNonceSize;
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constexpr size_t FragmentBodyPayloadSize = 1024;
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constexpr size_t FragmentBodyOverhead = sizeof(uint32_t) * 2;
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constexpr size_t FragmentBodySize =
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FragmentBodyOverhead + FragmentBodyPayloadSize;
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2018-09-04 12:41:25 +00:00
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constexpr size_t FragmentBufferSize =
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FragmentOverheadSize + FragmentBodySize;
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typedef llarp::AlignedBuffer< FragmentBufferSize > FragmentBuffer;
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typedef llarp::AlignedBuffer< MAX_LINK_MSG_SIZE > MessageBuffer;
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struct LinkLayer;
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struct BaseSession : public ILinkSession
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{
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RouterContact remoteRC;
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utp_socket* sock;
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LinkLayer* parent;
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bool gotLIM;
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PubKey remoteTransportPubKey;
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Addr remoteAddr;
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SharedSecret sessionKey;
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llarp_time_t lastActive;
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const static llarp_time_t sessionTimeout = 30 * 1000;
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2018-09-07 20:36:06 +00:00
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std::deque< FragmentBuffer > sendq;
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size_t sendBufOffset;
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FragmentBuffer recvBuf;
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size_t recvBufOffset;
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MessageBuffer recvMsg;
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size_t recvMsgOffset;
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bool stalled = false;
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2018-09-06 13:16:24 +00:00
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void
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Alive();
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2018-09-06 11:46:19 +00:00
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/// base
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BaseSession(llarp_router* r);
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2018-09-06 11:46:19 +00:00
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/// outbound
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BaseSession(llarp_router* r, utp_socket* s, const RouterContact& rc,
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const AddressInfo& addr);
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/// inbound
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BaseSession(llarp_router* r, utp_socket* s, const Addr& remote);
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enum State
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{
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eInitial,
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eConnecting,
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eLinkEstablished, // when utp connection is established
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eCryptoHandshake, // crypto handshake initiated
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eSessionReady, // session is ready
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eClose // utp connection is closed
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};
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llarp_router*
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Router();
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State state;
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void
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OnLinkEstablished(LinkLayer* p)
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{
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parent = p;
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EnterState(eLinkEstablished);
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llarp::LogDebug("link established with ", remoteAddr);
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}
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void
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EnterState(State st);
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BaseSession();
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virtual ~BaseSession();
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void
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PumpWrite()
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{
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while(sendq.size() > 0 && !stalled)
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{
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ssize_t expect = FragmentBufferSize - sendBufOffset;
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ssize_t s = write_ll(sendq.front().data() + sendBufOffset, expect);
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if(s != expect)
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{
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llarp::LogDebug("stalled at offset=", sendBufOffset, " sz=", s,
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" to ", remoteAddr);
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sendBufOffset += s;
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stalled = true;
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}
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else
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{
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sendBufOffset = 0;
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sendq.pop_front();
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}
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}
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}
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ssize_t
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write_ll(byte_t* buf, size_t sz)
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{
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if(sock == nullptr)
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{
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llarp::LogWarn("write_ll failed: no socket");
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return 0;
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}
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ssize_t s = utp_write(sock, buf, sz);
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llarp::LogDebug("write_ll ", s, " of ", sz, " bytes to ", remoteAddr);
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return s;
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2018-09-04 12:41:25 +00:00
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}
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bool
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VerifyThenDecrypt(byte_t* buf);
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void
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EncryptThenHash(const byte_t* ptr, uint32_t sz, bool isLastFragment);
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bool
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QueueWriteBuffers(llarp_buffer_t buf)
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{
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llarp::LogDebug("write ", buf.sz, " bytes to ", remoteAddr);
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if(state != eSessionReady)
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{
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llarp::LogWarn("failed to send ", buf.sz,
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" bytes on non ready session state=", state);
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return false;
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}
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else
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lastActive = llarp_time_now_ms();
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size_t sz = buf.sz;
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byte_t* ptr = buf.base;
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while(sz)
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{
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uint32_t s = std::min(FragmentBodyPayloadSize, sz);
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EncryptThenHash(ptr, s, ((sz - s) == 0));
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ptr += s;
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sz -= s;
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}
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return true;
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}
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2018-09-06 11:46:19 +00:00
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void
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Connect()
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{
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utp_connect(sock, remoteAddr, remoteAddr.SockLen());
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EnterState(eConnecting);
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}
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void
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OutboundLinkEstablished(LinkLayer* p)
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{
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OnLinkEstablished(p);
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KeyExchangeNonce nonce;
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nonce.Randomize();
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gotLIM = true;
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2018-09-06 20:31:58 +00:00
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if(DoKeyExchange(Router()->crypto.transport_dh_client, nonce,
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remoteTransportPubKey, Router()->encryption))
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{
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SendHandshake(nonce);
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EnterState(eSessionReady);
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SendKeepAlive();
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2018-09-06 11:46:19 +00:00
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}
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}
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// send our RC to the remote
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void
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2018-09-07 17:41:49 +00:00
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SendHandshake(const KeyExchangeNonce& n)
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{
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2018-09-07 17:41:49 +00:00
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FragmentBuffer tmp;
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auto buf = InitBuffer(tmp.data(), tmp.size());
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2018-09-06 11:46:19 +00:00
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// fastforward buffer for handshake to fit before
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buf.cur += sizeof(uint32_t) * 2;
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byte_t* begin = buf.cur;
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LinkIntroMessage msg;
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msg.rc = Router()->rc;
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msg.N = n;
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2018-09-06 11:46:19 +00:00
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if(!msg.BEncode(&buf))
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{
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llarp::LogError("failed to encode our RC for handshake");
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2018-09-06 20:31:58 +00:00
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Close();
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2018-09-06 11:46:19 +00:00
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return;
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}
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uint32_t sz = buf.cur - begin;
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llarp::LogDebug("handshake is of size ", sz, " bytes");
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// write handshake header
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buf.cur = buf.base;
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llarp_buffer_put_uint32(&buf, LLARP_PROTO_VERSION);
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llarp_buffer_put_uint32(&buf, sz);
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// send it
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2018-09-07 17:41:49 +00:00
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write_ll(tmp.data(), sz + (sizeof(uint32_t) * 2));
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2018-09-06 11:46:19 +00:00
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}
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2018-09-04 19:15:06 +00:00
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bool
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2018-09-06 20:31:58 +00:00
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DoKeyExchange(llarp_transport_dh_func dh, const KeyExchangeNonce& n,
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const PubKey& other, const SecretKey& secret)
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2018-09-04 12:41:25 +00:00
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{
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2018-09-06 20:31:58 +00:00
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PubKey us = llarp::seckey_topublic(secret);
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2018-09-07 17:41:49 +00:00
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llarp::LogDebug("DH us=", us, " them=", other, " n=", n);
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if(!dh(sessionKey, other, secret, n))
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{
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llarp::LogError("key exchange with ", other, " failed");
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2018-09-06 20:31:58 +00:00
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Close();
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return false;
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}
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return true;
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2018-09-04 12:41:25 +00:00
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}
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void
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2018-09-06 11:46:19 +00:00
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TickImpl(llarp_time_t now)
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2018-09-04 12:41:25 +00:00
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{
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}
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void
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2018-09-07 17:41:49 +00:00
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Close();
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2018-09-04 12:41:25 +00:00
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2018-09-07 20:36:06 +00:00
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bool
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RecvHandshake(const void* buf, size_t bufsz, LinkLayer* p);
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2018-09-04 12:41:25 +00:00
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bool
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Recv(const void* buf, size_t sz)
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{
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2018-09-07 17:41:49 +00:00
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if(state != eSessionReady)
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{
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llarp::LogWarn("session not ready via ", remoteAddr);
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return false;
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}
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Alive();
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byte_t* ptr = (const byte_t*)buf;
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2018-09-04 12:41:25 +00:00
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llarp::LogDebug("utp read ", sz, " from ", remoteAddr);
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2018-09-06 20:31:58 +00:00
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size_t s = sz;
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2018-09-07 17:41:49 +00:00
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// process leftovers
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if(recvBufOffset)
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{
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2018-09-07 20:36:06 +00:00
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auto left = FragmentBufferSize - recvBufOffset;
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2018-09-07 17:41:49 +00:00
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if(s >= left)
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2018-09-06 20:31:58 +00:00
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{
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2018-09-07 20:36:06 +00:00
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// yes it fills it
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2018-09-07 17:41:49 +00:00
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llarp::LogDebug("process leftovers, offset=", recvBufOffset,
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" sz=", s, " left=", left);
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memcpy(recvBuf.data() + recvBufOffset, ptr, left);
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s -= left;
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recvBufOffset = 0;
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ptr += left;
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2018-09-07 20:36:06 +00:00
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if(!VerifyThenDecrypt(recvBuf.data()))
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2018-09-06 20:31:58 +00:00
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return false;
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}
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2018-09-04 12:41:25 +00:00
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}
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2018-09-07 20:36:06 +00:00
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// process full fragments
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2018-09-07 17:41:49 +00:00
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while(s >= FragmentBufferSize)
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{
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2018-09-07 20:36:06 +00:00
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recvBufOffset = 0;
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2018-09-07 17:41:49 +00:00
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llarp::LogDebug("process full sz=", s);
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if(!VerifyThenDecrypt(ptr))
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return false;
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ptr += FragmentBufferSize;
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s -= FragmentBufferSize;
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}
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if(s)
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{
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// hold onto leftovers
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llarp::LogDebug("leftovers sz=", s);
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2018-09-07 20:36:06 +00:00
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memcpy(recvBuf.data() + recvBufOffset, ptr, s);
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recvBufOffset += s;
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2018-09-07 17:41:49 +00:00
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}
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2018-09-04 12:41:25 +00:00
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return true;
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}
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bool
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2018-09-06 11:46:19 +00:00
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IsTimedOut(llarp_time_t now) const
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2018-09-04 12:41:25 +00:00
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{
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if(now < lastActive)
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return false;
|
2018-09-07 17:41:49 +00:00
|
|
|
auto dlt = now - lastActive;
|
|
|
|
if(dlt >= sessionTimeout)
|
|
|
|
{
|
|
|
|
llarp::LogDebug("session timeout reached for ", remoteAddr);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
return false;
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
const PubKey&
|
2018-09-06 13:16:24 +00:00
|
|
|
RemotePubKey() const
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
|
|
|
return remoteRC.pubkey;
|
|
|
|
}
|
|
|
|
|
|
|
|
const Addr&
|
2018-09-07 17:41:49 +00:00
|
|
|
RemoteEndpoint() const
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
|
|
|
return remoteAddr;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
MarkEstablished();
|
2018-09-04 19:15:06 +00:00
|
|
|
}; // namespace utp
|
2018-09-04 12:41:25 +00:00
|
|
|
|
|
|
|
struct LinkLayer : public ILinkLayer
|
|
|
|
{
|
|
|
|
utp_context* _utp_ctx = nullptr;
|
2018-09-06 11:46:19 +00:00
|
|
|
llarp_router* router = nullptr;
|
2018-09-04 12:41:25 +00:00
|
|
|
static uint64
|
2018-09-06 11:46:19 +00:00
|
|
|
OnRead(utp_callback_arguments* arg);
|
2018-09-04 12:41:25 +00:00
|
|
|
|
|
|
|
static uint64
|
|
|
|
SendTo(utp_callback_arguments* arg)
|
|
|
|
{
|
|
|
|
LinkLayer* l =
|
|
|
|
static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogDebug("utp_sendto ", Addr(*arg->address), " ", arg->len,
|
|
|
|
" bytes");
|
|
|
|
if(sendto(l->m_udp.fd, arg->buf, arg->len, arg->flags, arg->address,
|
|
|
|
arg->address_len)
|
|
|
|
== -1)
|
|
|
|
{
|
|
|
|
llarp::LogError("sendto failed: ", strerror(errno));
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint64
|
|
|
|
OnError(utp_callback_arguments* arg)
|
|
|
|
{
|
|
|
|
llarp::LogError(utp_error_code_names[arg->error_code]);
|
2018-09-04 12:41:25 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint64
|
2018-09-06 11:46:19 +00:00
|
|
|
OnStateChange(utp_callback_arguments*);
|
2018-09-04 12:41:25 +00:00
|
|
|
|
|
|
|
static uint64
|
|
|
|
OnAccept(utp_callback_arguments*);
|
|
|
|
|
2018-09-06 20:31:58 +00:00
|
|
|
static uint64
|
|
|
|
OnLog(utp_callback_arguments* arg)
|
|
|
|
{
|
|
|
|
llarp::LogDebug(arg->buf);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
LinkLayer(llarp_router* r) : ILinkLayer()
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
2018-09-06 11:46:19 +00:00
|
|
|
router = r;
|
2018-09-04 12:41:25 +00:00
|
|
|
_utp_ctx = utp_init(2);
|
|
|
|
utp_context_set_userdata(_utp_ctx, this);
|
|
|
|
utp_set_callback(_utp_ctx, UTP_SENDTO, &LinkLayer::SendTo);
|
|
|
|
utp_set_callback(_utp_ctx, UTP_ON_ACCEPT, &LinkLayer::OnAccept);
|
2018-09-06 11:46:19 +00:00
|
|
|
utp_set_callback(_utp_ctx, UTP_ON_STATE_CHANGE,
|
|
|
|
&LinkLayer::OnStateChange);
|
2018-09-04 12:41:25 +00:00
|
|
|
utp_set_callback(_utp_ctx, UTP_ON_READ, &LinkLayer::OnRead);
|
2018-09-06 20:31:58 +00:00
|
|
|
utp_set_callback(_utp_ctx, UTP_ON_ERROR, &LinkLayer::OnError);
|
|
|
|
utp_set_callback(_utp_ctx, UTP_LOG, &LinkLayer::OnLog);
|
2018-09-04 19:15:06 +00:00
|
|
|
utp_context_set_option(_utp_ctx, UTP_LOG_NORMAL, 1);
|
|
|
|
utp_context_set_option(_utp_ctx, UTP_LOG_MTU, 1);
|
|
|
|
utp_context_set_option(_utp_ctx, UTP_LOG_DEBUG, 1);
|
2018-09-07 17:41:49 +00:00
|
|
|
utp_context_set_option(_utp_ctx, UTP_SNDBUF, MAX_LINK_MSG_SIZE * 16);
|
2018-09-06 20:31:58 +00:00
|
|
|
utp_context_set_option(_utp_ctx, UTP_RCVBUF, MAX_LINK_MSG_SIZE * 64);
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
~LinkLayer()
|
|
|
|
{
|
|
|
|
utp_destroy(_utp_ctx);
|
|
|
|
}
|
|
|
|
|
|
|
|
uint16_t
|
|
|
|
Rank() const
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
RecvFrom(const Addr& from, const void* buf, size_t sz)
|
|
|
|
{
|
|
|
|
utp_process_udp(_utp_ctx, (const byte_t*)buf, sz, from, from.SockLen());
|
|
|
|
}
|
|
|
|
|
2018-09-06 20:31:58 +00:00
|
|
|
#ifdef __linux__
|
|
|
|
void
|
|
|
|
ProcessICMP()
|
|
|
|
{
|
|
|
|
do
|
|
|
|
{
|
|
|
|
byte_t vec_buf[4096], ancillary_buf[4096];
|
|
|
|
struct iovec iov = {vec_buf, sizeof(vec_buf)};
|
|
|
|
struct sockaddr_in remote;
|
|
|
|
struct msghdr msg;
|
|
|
|
ssize_t len;
|
|
|
|
struct cmsghdr* cmsg;
|
|
|
|
struct sock_extended_err* e;
|
|
|
|
struct sockaddr* icmp_addr;
|
|
|
|
struct sockaddr_in* icmp_sin;
|
|
|
|
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
|
|
|
|
|
|
msg.msg_name = &remote;
|
|
|
|
msg.msg_namelen = sizeof(remote);
|
|
|
|
msg.msg_iov = &iov;
|
|
|
|
msg.msg_iovlen = 1;
|
|
|
|
msg.msg_flags = 0;
|
|
|
|
msg.msg_control = ancillary_buf;
|
|
|
|
msg.msg_controllen = sizeof(ancillary_buf);
|
|
|
|
|
|
|
|
len = recvmsg(m_udp.fd, &msg, MSG_ERRQUEUE | MSG_DONTWAIT);
|
|
|
|
if(len < 0)
|
|
|
|
{
|
|
|
|
if(errno == EAGAIN || errno == EWOULDBLOCK)
|
|
|
|
errno = 0;
|
|
|
|
else
|
|
|
|
llarp::LogError("failed to read icmp for utp ", strerror(errno));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
for(cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
|
|
|
|
{
|
|
|
|
if(cmsg->cmsg_type != IP_RECVERR)
|
|
|
|
{
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if(cmsg->cmsg_level != SOL_IP)
|
|
|
|
{
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
e = (struct sock_extended_err*)CMSG_DATA(cmsg);
|
|
|
|
if(!e)
|
|
|
|
continue;
|
|
|
|
if(e->ee_origin != SO_EE_ORIGIN_ICMP)
|
|
|
|
{
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
icmp_addr = (struct sockaddr*)SO_EE_OFFENDER(e);
|
|
|
|
icmp_sin = (struct sockaddr_in*)icmp_addr;
|
|
|
|
if(icmp_sin->sin_port != 0)
|
|
|
|
{
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if(e->ee_type == 3 && e->ee_code == 4)
|
|
|
|
{
|
|
|
|
utp_process_icmp_fragmentation(_utp_ctx, vec_buf, len,
|
|
|
|
(struct sockaddr*)&remote,
|
|
|
|
sizeof(remote), e->ee_info);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
utp_process_icmp_error(_utp_ctx, vec_buf, len,
|
|
|
|
(struct sockaddr*)&remote, sizeof(remote));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} while(true);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2018-09-04 12:41:25 +00:00
|
|
|
void
|
|
|
|
Pump()
|
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
utp_issue_deferred_acks(_utp_ctx);
|
2018-09-06 20:31:58 +00:00
|
|
|
#ifdef __linux__
|
|
|
|
ProcessICMP();
|
|
|
|
#endif
|
2018-09-07 17:41:49 +00:00
|
|
|
ILinkLayer::Pump();
|
2018-09-06 20:31:58 +00:00
|
|
|
}
|
2018-09-04 12:41:25 +00:00
|
|
|
void
|
|
|
|
Stop()
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
llarp_router*
|
|
|
|
GetRouter();
|
|
|
|
|
2018-09-04 12:41:25 +00:00
|
|
|
bool
|
|
|
|
KeyGen(SecretKey& k)
|
|
|
|
{
|
2018-09-06 11:46:19 +00:00
|
|
|
router->crypto.encryption_keygen(k);
|
2018-09-04 12:41:25 +00:00
|
|
|
return true;
|
|
|
|
}
|
2018-09-06 20:31:58 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
Tick(llarp_time_t now)
|
|
|
|
{
|
|
|
|
utp_check_timeouts(_utp_ctx);
|
|
|
|
ILinkLayer::Tick(now);
|
|
|
|
}
|
|
|
|
|
2018-09-06 13:16:24 +00:00
|
|
|
ILinkSession*
|
2018-09-04 12:41:25 +00:00
|
|
|
NewOutboundSession(const RouterContact& rc, const AddressInfo& addr);
|
|
|
|
|
|
|
|
utp_socket*
|
|
|
|
NewSocket()
|
|
|
|
{
|
|
|
|
return utp_create_socket(_utp_ctx);
|
|
|
|
}
|
|
|
|
|
|
|
|
const char*
|
|
|
|
Name() const
|
|
|
|
{
|
|
|
|
return "utp";
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
std::unique_ptr< ILinkLayer >
|
|
|
|
NewServer(llarp_router* r)
|
|
|
|
{
|
2018-09-04 19:15:06 +00:00
|
|
|
return std::unique_ptr< LinkLayer >(new LinkLayer(r));
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
BaseSession::BaseSession(llarp_router* r)
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
remoteTransportPubKey.Zero();
|
2018-09-06 20:31:58 +00:00
|
|
|
parent = nullptr;
|
|
|
|
recvMsgOffset = 0;
|
|
|
|
SendKeepAlive = [&]() -> bool {
|
2018-09-07 17:41:49 +00:00
|
|
|
if(false && sendq.size() == 0)
|
2018-09-06 20:31:58 +00:00
|
|
|
{
|
|
|
|
DiscardMessage msg;
|
|
|
|
byte_t tmp[128] = {0};
|
|
|
|
auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
|
|
|
|
if(!msg.BEncode(&buf))
|
|
|
|
return false;
|
|
|
|
buf.sz = buf.cur - buf.base;
|
|
|
|
buf.cur = buf.base;
|
|
|
|
if(!this->QueueWriteBuffers(buf))
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
};
|
2018-09-07 17:41:49 +00:00
|
|
|
sendBufOffset = 0;
|
2018-09-06 11:46:19 +00:00
|
|
|
recvBufOffset = 0;
|
|
|
|
TimedOut = [&](llarp_time_t now) -> bool {
|
2018-09-07 17:41:49 +00:00
|
|
|
return this->IsTimedOut(now) || this->state == eClose;
|
2018-09-06 11:46:19 +00:00
|
|
|
};
|
2018-09-06 13:16:24 +00:00
|
|
|
GetPubKey = std::bind(&BaseSession::RemotePubKey, this);
|
2018-09-06 11:46:19 +00:00
|
|
|
lastActive = llarp_time_now_ms();
|
2018-09-06 20:31:58 +00:00
|
|
|
Pump = std::bind(&BaseSession::PumpWrite, this);
|
2018-09-06 11:46:19 +00:00
|
|
|
Tick = std::bind(&BaseSession::TickImpl, this, std::placeholders::_1);
|
2018-09-07 17:41:49 +00:00
|
|
|
SendMessageBuffer = std::bind(&BaseSession::QueueWriteBuffers, this,
|
|
|
|
std::placeholders::_1);
|
|
|
|
|
|
|
|
IsEstablished = [=]() {
|
|
|
|
return this->state == eSessionReady || this->state == eLinkEstablished;
|
2018-09-06 11:46:19 +00:00
|
|
|
};
|
2018-09-07 17:41:49 +00:00
|
|
|
|
|
|
|
SendClose = std::bind(&BaseSession::Close, this);
|
|
|
|
GetRemoteEndpoint = std::bind(&BaseSession::RemoteEndpoint, this);
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
2018-09-04 12:41:25 +00:00
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
BaseSession::BaseSession(llarp_router* r, utp_socket* s,
|
|
|
|
const RouterContact& rc, const AddressInfo& addr)
|
|
|
|
: BaseSession(r)
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
2018-09-06 11:46:19 +00:00
|
|
|
remoteRC.Clear();
|
|
|
|
remoteTransportPubKey = addr.pubkey;
|
|
|
|
remoteRC = rc;
|
|
|
|
sock = s;
|
|
|
|
assert(utp_set_userdata(sock, this) == this);
|
2018-09-06 13:16:24 +00:00
|
|
|
assert(s == sock);
|
2018-09-06 11:46:19 +00:00
|
|
|
remoteAddr = addr;
|
|
|
|
Start = std::bind(&BaseSession::Connect, this);
|
|
|
|
}
|
2018-09-04 12:41:25 +00:00
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
BaseSession::BaseSession(llarp_router* r, utp_socket* s, const Addr& addr)
|
|
|
|
: BaseSession(r)
|
|
|
|
{
|
|
|
|
remoteRC.Clear();
|
|
|
|
sock = s;
|
2018-09-06 13:16:24 +00:00
|
|
|
assert(s == sock);
|
2018-09-06 11:46:19 +00:00
|
|
|
assert(utp_set_userdata(sock, this) == this);
|
|
|
|
remoteAddr = addr;
|
|
|
|
Start = []() {};
|
|
|
|
}
|
2018-09-04 12:41:25 +00:00
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
llarp_router*
|
|
|
|
BaseSession::Router()
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
2018-09-06 11:46:19 +00:00
|
|
|
return parent->router;
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
BaseSession::~BaseSession()
|
|
|
|
{
|
2018-09-06 13:16:24 +00:00
|
|
|
if(sock)
|
|
|
|
{
|
|
|
|
utp_set_userdata(sock, nullptr);
|
2018-09-07 17:41:49 +00:00
|
|
|
sock = nullptr;
|
2018-09-06 13:16:24 +00:00
|
|
|
}
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
2018-09-06 13:16:24 +00:00
|
|
|
ILinkSession*
|
2018-09-04 12:41:25 +00:00
|
|
|
LinkLayer::NewOutboundSession(const RouterContact& rc,
|
|
|
|
const AddressInfo& addr)
|
|
|
|
{
|
2018-09-06 13:16:24 +00:00
|
|
|
return new BaseSession(router, utp_create_socket(_utp_ctx), rc, addr);
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
uint64
|
|
|
|
LinkLayer::OnRead(utp_callback_arguments* arg)
|
|
|
|
{
|
2018-09-06 20:31:58 +00:00
|
|
|
LinkLayer* parent =
|
|
|
|
static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
|
2018-09-06 11:46:19 +00:00
|
|
|
BaseSession* self =
|
|
|
|
static_cast< BaseSession* >(utp_get_userdata(arg->socket));
|
2018-09-07 17:41:49 +00:00
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
if(self)
|
|
|
|
{
|
2018-09-06 13:16:24 +00:00
|
|
|
if(self->state == BaseSession::eClose)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
else if(self->state == BaseSession::eSessionReady)
|
2018-09-06 20:31:58 +00:00
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
if(!self->Recv(arg->buf, arg->len))
|
|
|
|
{
|
|
|
|
llarp::LogDebug("recv fail for ", self->remoteAddr);
|
|
|
|
self->Close();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
utp_read_drained(arg->socket);
|
2018-09-06 20:31:58 +00:00
|
|
|
}
|
2018-09-06 11:46:19 +00:00
|
|
|
else if(self->state == BaseSession::eLinkEstablished)
|
|
|
|
{
|
2018-09-07 20:36:06 +00:00
|
|
|
if(!self->RecvHandshake(arg->buf, arg->len, parent))
|
|
|
|
{
|
|
|
|
llarp::LogDebug("recv handshake failed for ", self->remoteAddr);
|
|
|
|
self->Close();
|
|
|
|
return 0;
|
|
|
|
}
|
2018-09-07 17:41:49 +00:00
|
|
|
utp_read_drained(arg->socket);
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
llarp::LogWarn("utp_socket got data with no underlying session");
|
|
|
|
}
|
|
|
|
return 0;
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
uint64
|
|
|
|
LinkLayer::OnStateChange(utp_callback_arguments* arg)
|
2018-09-04 12:41:25 +00:00
|
|
|
{
|
2018-09-06 11:46:19 +00:00
|
|
|
LinkLayer* l =
|
|
|
|
static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
|
|
|
|
BaseSession* session =
|
|
|
|
static_cast< BaseSession* >(utp_get_userdata(arg->socket));
|
2018-09-06 13:16:24 +00:00
|
|
|
if(session)
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
2018-09-06 13:16:24 +00:00
|
|
|
if(arg->state == UTP_STATE_CONNECT)
|
|
|
|
{
|
|
|
|
if(session->state == BaseSession::eClose)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
session->OutboundLinkEstablished(l);
|
|
|
|
}
|
2018-09-06 20:31:58 +00:00
|
|
|
else if(arg->state == UTP_STATE_WRITABLE)
|
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
if(session->IsEstablished())
|
|
|
|
{
|
|
|
|
llarp::LogDebug("write resumed for ", session->remoteAddr);
|
|
|
|
session->stalled = false;
|
|
|
|
session->PumpWrite();
|
|
|
|
}
|
2018-09-06 20:31:58 +00:00
|
|
|
}
|
2018-09-06 13:16:24 +00:00
|
|
|
else if(arg->state == UTP_STATE_EOF)
|
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
llarp::LogDebug("got eof from ", session->remoteAddr);
|
|
|
|
session->Close();
|
2018-09-06 13:16:24 +00:00
|
|
|
}
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
return 0;
|
2018-09-04 12:41:25 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
uint64
|
|
|
|
LinkLayer::OnAccept(utp_callback_arguments* arg)
|
|
|
|
{
|
|
|
|
LinkLayer* self =
|
|
|
|
static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
|
|
|
|
Addr remote(*arg->address);
|
|
|
|
llarp::LogDebug("utp accepted from ", remote);
|
2018-09-06 11:46:19 +00:00
|
|
|
BaseSession* session = new BaseSession(self->router, arg->socket, remote);
|
2018-09-04 12:41:25 +00:00
|
|
|
self->PutSession(remote, session);
|
2018-09-06 11:46:19 +00:00
|
|
|
session->OnLinkEstablished(self);
|
2018-09-04 12:41:25 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-09-06 11:46:19 +00:00
|
|
|
void
|
2018-09-07 20:36:06 +00:00
|
|
|
BaseSession::EncryptThenHash(const byte_t* ptr, uint32_t sz,
|
|
|
|
bool isLastFragment)
|
2018-09-06 11:46:19 +00:00
|
|
|
|
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
if(state != eSessionReady)
|
|
|
|
{
|
|
|
|
llarp::LogWarn("tried to send to non ready session on ", remoteAddr);
|
|
|
|
return;
|
|
|
|
}
|
2018-09-07 20:36:06 +00:00
|
|
|
FragmentBuffer buf;
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogDebug("encrypt then hash ", sz, " bytes last=", isLastFragment);
|
2018-09-06 11:46:19 +00:00
|
|
|
buf.Randomize();
|
2018-09-07 20:36:06 +00:00
|
|
|
byte_t* nonce = buf.data() + FragmentHashSize;
|
|
|
|
byte_t* body = nonce + FragmentNonceSize;
|
|
|
|
byte_t* base = body;
|
2018-09-06 11:46:19 +00:00
|
|
|
if(isLastFragment)
|
|
|
|
htobe32buf(body, 0);
|
2018-09-07 17:41:49 +00:00
|
|
|
else
|
|
|
|
htobe32buf(body, 1);
|
2018-09-06 11:46:19 +00:00
|
|
|
body += sizeof(uint32_t);
|
|
|
|
htobe32buf(body, sz);
|
|
|
|
body += sizeof(uint32_t);
|
|
|
|
memcpy(body, ptr, sz);
|
2018-09-07 20:36:06 +00:00
|
|
|
|
|
|
|
auto payload =
|
|
|
|
InitBuffer(base, FragmentBufferSize - FragmentOverheadSize);
|
|
|
|
|
|
|
|
// encrypt
|
2018-09-07 17:41:49 +00:00
|
|
|
Router()->crypto.xchacha20(payload, sessionKey, nonce);
|
2018-09-07 20:36:06 +00:00
|
|
|
|
|
|
|
payload.base = nonce;
|
2018-09-06 20:31:58 +00:00
|
|
|
payload.cur = payload.base;
|
2018-09-07 20:36:06 +00:00
|
|
|
payload.sz = FragmentBufferSize - FragmentHashSize;
|
|
|
|
// key'd hash
|
2018-09-07 17:41:49 +00:00
|
|
|
Router()->crypto.hmac(buf.data(), payload, sessionKey);
|
2018-09-07 20:36:06 +00:00
|
|
|
// push back
|
|
|
|
sendq.push_back(std::move(buf));
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
BaseSession::EnterState(State st)
|
|
|
|
{
|
2018-09-06 13:16:24 +00:00
|
|
|
state = st;
|
2018-09-06 11:46:19 +00:00
|
|
|
if(st == eSessionReady)
|
|
|
|
{
|
2018-09-07 17:41:49 +00:00
|
|
|
parent->MapAddr(remoteRC.pubkey, this);
|
2018-09-06 11:46:19 +00:00
|
|
|
Router()->HandleLinkSessionEstablished(remoteRC);
|
|
|
|
}
|
2018-09-06 20:31:58 +00:00
|
|
|
Alive();
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
bool
|
2018-09-07 17:41:49 +00:00
|
|
|
BaseSession::VerifyThenDecrypt(byte_t* buf)
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogDebug("verify then decrypt ", remoteAddr);
|
2018-09-06 11:46:19 +00:00
|
|
|
ShortHash digest;
|
2018-09-06 20:31:58 +00:00
|
|
|
|
2018-09-07 17:41:49 +00:00
|
|
|
auto hbuf = InitBuffer(buf + FragmentHashSize,
|
|
|
|
FragmentBufferSize - FragmentHashSize);
|
|
|
|
if(!Router()->crypto.hmac(digest.data(), hbuf, sessionKey))
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
|
|
|
llarp::LogError("keyed hash failed");
|
|
|
|
return false;
|
|
|
|
}
|
2018-09-07 17:41:49 +00:00
|
|
|
ShortHash expected(buf);
|
|
|
|
if(expected != digest)
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogError("Message Integrity Failed: got ", digest, " from ",
|
2018-09-07 17:41:49 +00:00
|
|
|
remoteAddr, " instead of ", expected);
|
|
|
|
llarp::DumpBuffer(InitBuffer(buf, FragmentBufferSize));
|
2018-09-06 11:46:19 +00:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2018-09-07 17:41:49 +00:00
|
|
|
auto body = InitBuffer(buf + FragmentOverheadSize,
|
2018-09-06 11:46:19 +00:00
|
|
|
FragmentBufferSize - FragmentOverheadSize);
|
|
|
|
|
2018-09-07 17:41:49 +00:00
|
|
|
Router()->crypto.xchacha20(body, sessionKey, buf + FragmentHashSize);
|
2018-09-06 11:46:19 +00:00
|
|
|
|
|
|
|
uint32_t upper, lower;
|
|
|
|
if(!(llarp_buffer_read_uint32(&body, &upper)
|
|
|
|
&& llarp_buffer_read_uint32(&body, &lower)))
|
|
|
|
return false;
|
|
|
|
bool fragmentEnd = upper == 0;
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogDebug("fragment size ", lower, " from ", remoteAddr);
|
|
|
|
if(lower + recvMsgOffset > recvMsg.size())
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
|
|
|
llarp::LogError("Fragment too big: ", lower, " bytes");
|
|
|
|
return false;
|
|
|
|
}
|
2018-09-07 20:36:06 +00:00
|
|
|
memcpy(recvMsg.data() + recvMsgOffset, body.cur, lower);
|
2018-09-06 20:31:58 +00:00
|
|
|
recvMsgOffset += lower;
|
2018-09-06 11:46:19 +00:00
|
|
|
if(fragmentEnd)
|
|
|
|
{
|
|
|
|
// got a message
|
2018-09-06 20:31:58 +00:00
|
|
|
llarp::LogDebug("end of message from ", remoteAddr);
|
2018-09-07 20:36:06 +00:00
|
|
|
auto mbuf = InitBuffer(recvMsg.data(), recvMsgOffset);
|
|
|
|
if(!Router()->HandleRecvLinkMessageBuffer(this, mbuf))
|
2018-09-06 20:31:58 +00:00
|
|
|
{
|
|
|
|
llarp::LogWarn("failed to handle message from ", remoteAddr);
|
|
|
|
llarp::DumpBuffer(mbuf);
|
|
|
|
}
|
|
|
|
recvMsgOffset = 0;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2018-09-07 20:36:06 +00:00
|
|
|
bool
|
|
|
|
BaseSession::RecvHandshake(const void* buf, size_t bufsz, LinkLayer* p)
|
2018-09-06 11:46:19 +00:00
|
|
|
{
|
|
|
|
size_t sz = bufsz;
|
|
|
|
parent = p;
|
|
|
|
|
|
|
|
llarp::LogDebug("recv handshake ", sz, " from ", remoteAddr);
|
|
|
|
if(sz <= 8)
|
|
|
|
{
|
|
|
|
llarp::LogDebug("handshake too small from ", remoteAddr);
|
2018-09-06 20:31:58 +00:00
|
|
|
Close();
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// process handshake header
|
2018-09-07 17:41:49 +00:00
|
|
|
byte_t* ptr = (byte_t*)buf;
|
2018-09-06 11:46:19 +00:00
|
|
|
uint32_t version = bufbe32toh(ptr);
|
|
|
|
if(version != LLARP_PROTO_VERSION)
|
|
|
|
{
|
|
|
|
llarp::LogWarn("protocol version missmatch ", version,
|
|
|
|
" != ", LLARP_PROTO_VERSION);
|
2018-09-06 20:31:58 +00:00
|
|
|
Close();
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
ptr += sizeof(uint32_t);
|
|
|
|
sz -= sizeof(uint32_t);
|
|
|
|
uint32_t limsz = bufbe32toh(ptr);
|
|
|
|
ptr += sizeof(uint32_t);
|
|
|
|
sz -= sizeof(uint32_t);
|
|
|
|
if(limsz > sz)
|
|
|
|
{
|
|
|
|
// not enough data
|
|
|
|
// TODO: don't bail here, continue reading
|
|
|
|
llarp::LogDebug("not enough data for handshake, want ", limsz,
|
|
|
|
" bytes but got ", sz);
|
2018-09-06 20:31:58 +00:00
|
|
|
Close();
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
2018-09-07 20:36:06 +00:00
|
|
|
|
|
|
|
llarp::LogDebug("from ", bufsz, " bytes reading ", limsz, " of ", sz,
|
|
|
|
" bytes");
|
2018-09-06 11:46:19 +00:00
|
|
|
|
|
|
|
// process LIM
|
|
|
|
auto mbuf = InitBuffer(ptr, limsz);
|
|
|
|
LinkIntroMessage msg(this);
|
|
|
|
if(!msg.BDecode(&mbuf))
|
|
|
|
{
|
|
|
|
llarp::LogError("Failed to parse LIM from ", remoteAddr);
|
|
|
|
llarp::DumpBuffer(mbuf);
|
2018-09-06 20:31:58 +00:00
|
|
|
Close();
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
if(!msg.HandleMessage(Router()))
|
|
|
|
{
|
|
|
|
llarp::LogError("failed to verify signature of rc");
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
2018-09-07 20:36:06 +00:00
|
|
|
gotLIM = true;
|
2018-09-07 17:41:49 +00:00
|
|
|
sz -= limsz;
|
2018-09-06 11:46:19 +00:00
|
|
|
remoteRC = msg.rc;
|
2018-09-06 20:31:58 +00:00
|
|
|
if(!DoKeyExchange(Router()->crypto.transport_dh_server, msg.N,
|
|
|
|
remoteRC.enckey, parent->TransportSecretKey()))
|
2018-09-07 20:36:06 +00:00
|
|
|
return false;
|
|
|
|
EnterState(eSessionReady);
|
2018-09-07 17:41:49 +00:00
|
|
|
if(sz)
|
|
|
|
{
|
|
|
|
llarp::LogDebug("got ", sz, " leftover from handshake from ",
|
|
|
|
remoteAddr);
|
2018-09-07 20:36:06 +00:00
|
|
|
return Recv(ptr + limsz, sz);
|
2018-09-07 17:41:49 +00:00
|
|
|
}
|
2018-09-07 20:36:06 +00:00
|
|
|
else
|
|
|
|
{
|
|
|
|
llarp::LogDebug("no leftovers in handshake from ", remoteAddr);
|
|
|
|
}
|
|
|
|
return true;
|
2018-09-06 20:31:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2018-09-07 17:41:49 +00:00
|
|
|
BaseSession::Close()
|
2018-09-06 20:31:58 +00:00
|
|
|
{
|
|
|
|
if(state != eClose)
|
|
|
|
{
|
2018-09-07 20:36:06 +00:00
|
|
|
if(sock)
|
|
|
|
{
|
|
|
|
utp_shutdown(sock, SHUT_RDWR);
|
|
|
|
utp_close(sock);
|
|
|
|
llarp::LogDebug("utp_close ", remoteAddr);
|
|
|
|
utp_set_userdata(sock, nullptr);
|
|
|
|
}
|
2018-09-06 20:31:58 +00:00
|
|
|
}
|
|
|
|
EnterState(eClose);
|
|
|
|
sock = nullptr;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
BaseSession::Alive()
|
|
|
|
{
|
|
|
|
lastActive = llarp_time_now_ms();
|
2018-09-06 11:46:19 +00:00
|
|
|
}
|
|
|
|
|
2018-09-04 12:41:25 +00:00
|
|
|
} // namespace utp
|
|
|
|
|
|
|
|
} // namespace llarp
|