nim-libp2p/libp2p/protocols/secure/secure.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import options
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import chronos
import chronicles
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import ../protocol,
../../stream/bufferstream,
../../crypto/crypto,
../../connection,
../../peerinfo
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type
Secure* = ref object of LPProtocol # base type for secure managers
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SecureConn* = ref object of Connection
method readMessage*(c: SecureConn): Future[seq[byte]] {.async, base.} =
doAssert(false, "Not implemented!")
method writeMessage*(c: SecureConn, data: seq[byte]) {.async, base.} =
doAssert(false, "Not implemented!")
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method handshake(s: Secure,
conn: Connection,
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initiator: bool = false): Future[SecureConn] {.async, base.} =
doAssert(false, "Not implemented!")
proc readLoop(sconn: SecureConn, stream: BufferStream) {.async.} =
try:
while not sconn.closed:
let msg = await sconn.readMessage()
if msg.len == 0:
trace "stream EOF"
return
await stream.pushTo(msg)
except CatchableError as exc:
trace "exception occurred SecioConn.readLoop", exc = exc.msg
finally:
if not sconn.closed:
await sconn.close()
trace "ending secio readLoop", isclosed = sconn.closed()
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proc handleConn*(s: Secure, conn: Connection, initiator: bool = false): Future[Connection] {.async, gcsafe.} =
var sconn = await s.handshake(conn, initiator)
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
trace "sending encrypted bytes", bytes = data.toHex()
await sconn.writeMessage(data)
var stream = newBufferStream(writeHandler)
asyncCheck readLoop(sconn, stream)
result = newConnection(stream)
result.closeEvent.wait()
.addCallback do (udata: pointer):
trace "wrapped connection closed, closing upstream"
if not isNil(sconn) and not sconn.closed:
asyncCheck sconn.close()
result.peerInfo = PeerInfo.init(sconn.peerInfo.publicKey.get())
method init*(s: Secure) {.gcsafe.} =
proc handle(conn: Connection, proto: string) {.async, gcsafe.} =
trace "handling connection"
try:
asyncCheck s.handleConn(conn)
trace "connection secured"
except CatchableError as exc:
if not conn.closed():
warn "securing connection failed", msg = exc.msg
await conn.close()
s.handler = handle
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method secure*(s: Secure, conn: Connection): Future[Connection] {.async, base, gcsafe.} =
try:
result = await s.handleConn(conn, true)
except CatchableError as exc:
warn "securing connection failed", msg = exc.msg
if not conn.closed():
await conn.close()