nim-libp2p/libp2p/wire.nim

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## Nim-Libp2p
## Copyright (c) 2018 Status Research & Development GmbH
## 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.
## This module implements wire network connection procedures.
import chronos, stew/endians2
import multiaddress, multicodec
when defined(windows):
import winlean
else:
import posix
const
TRANSPMA* = mapOr(
mapAnd(IP, mapEq("udp")),
mapAnd(IP, mapEq("tcp")),
mapAnd(mapEq("unix"))
)
RTRANSPMA* = mapOr(
mapAnd(IP, mapEq("tcp")),
mapAnd(mapEq("unix"))
)
proc initTAddress*(ma: MultiAddress): MaResult[TransportAddress] {.
raises: [Defect, ResultError[string]] .} =
## Initialize ``TransportAddress`` with MultiAddress ``ma``.
##
## MultiAddress must be wire address, e.g. ``{IP4, IP6, UNIX}/{TCP, UDP}``.
if TRANSPMA.match(ma):
var pbuf: array[2, byte]
let code = ma[0].tryGet().protoCode().tryGet()
if code == multiCodec("unix"):
var res = TransportAddress(family: AddressFamily.Unix)
if ma[0].tryGet().protoArgument(res.address_un).tryGet() == 0:
err("Incorrect Unix domain address")
else:
res.port = Port(1)
ok(res)
elif code == multiCodec("ip4"):
var res = TransportAddress(family: AddressFamily.IPv4)
if ma[0].tryGet().protoArgument(res.address_v4).tryGet() == 0:
err("Incorrect IPv4 address")
else:
if ma[1].tryGet().protoArgument(pbuf).tryGet() == 0:
err("Incorrect port number")
else:
res.port = Port(fromBytesBE(uint16, pbuf))
ok(res)
else:
var res = TransportAddress(family: AddressFamily.IPv6)
if ma[0].tryGet().protoArgument(res.address_v6).tryGet() == 0:
err("Incorrect IPv6 address")
else:
if ma[1].tryGet().protoArgument(pbuf).tryGet() == 0:
err("Incorrect port number")
else:
res.port = Port(fromBytesBE(uint16, pbuf))
ok(res)
else:
err("MultiAddress must be wire address (tcp, udp or unix)")
proc connect*(ma: MultiAddress, bufferSize = DefaultStreamBufferSize,
child: StreamTransport = nil): Future[StreamTransport] {.async.} =
## Open new connection to remote peer with address ``ma`` and create
## new transport object ``StreamTransport`` for established connection.
## ``bufferSize`` is size of internal buffer for transport.
if not(RTRANSPMA.match(ma)):
raise newException(MaInvalidAddress, "Incorrect or unsupported address!")
let address = initTAddress(ma).tryGet()
result = await connect(address, bufferSize, child)
proc createStreamServer*[T](ma: MultiAddress,
cbproc: StreamCallback,
flags: set[ServerFlags] = {},
udata: ref T,
sock: AsyncFD = asyncInvalidSocket,
backlog: int = 100,
bufferSize: int = DefaultStreamBufferSize,
child: StreamServer = nil,
init: TransportInitCallback = nil): StreamServer =
## Create new TCP stream server which bounds to ``ma`` address.
if not(RTRANSPMA.match(ma)):
raise newException(MaInvalidAddress, "Incorrect or unsupported address!")
let address = initTAddress(ma)
result = createStreamServer(address.tryGet(), cbproc, flags, udata, sock,
backlog, bufferSize, child, init)
proc createStreamServer*[T](ma: MultiAddress,
flags: set[ServerFlags] = {},
udata: ref T,
sock: AsyncFD = asyncInvalidSocket,
backlog: int = 100,
bufferSize: int = DefaultStreamBufferSize,
child: StreamServer = nil,
init: TransportInitCallback = nil): StreamServer =
## Create new TCP stream server which bounds to ``ma`` address.
if not(RTRANSPMA.match(ma)):
raise newException(MaInvalidAddress, "Incorrect or unsupported address!")
let address = initTAddress(ma)
result = createStreamServer(address.tryGet(), flags, udata, sock, backlog,
bufferSize, child, init)
proc createAsyncSocket*(ma: MultiAddress): AsyncFD =
## Create new asynchronous socket using MultiAddress' ``ma`` socket type and
## protocol information.
##
## Returns ``asyncInvalidSocket`` on error.
##
## Note: This procedure only used in `go-libp2p-daemon` wrapper.
var
socktype: SockType = SockType.SOCK_STREAM
protocol: Protocol = Protocol.IPPROTO_TCP
let maddr = initTAddress(ma)
if maddr.isErr():
return asyncInvalidSocket
let address = maddr.tryGet()
if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
if ma[1].tryGet().protoCode().tryGet() == multiCodec("udp"):
socktype = SockType.SOCK_DGRAM
protocol = Protocol.IPPROTO_UDP
elif ma[1].tryGet().protoCode().tryGet() == multiCodec("tcp"):
socktype = SockType.SOCK_STREAM
protocol = Protocol.IPPROTO_TCP
elif address.family in {AddressFamily.Unix}:
socktype = SockType.SOCK_STREAM
protocol = cast[Protocol](0)
else:
return asyncInvalidSocket
result = createAsyncSocket(address.getDomain(), socktype, protocol)
proc bindAsyncSocket*(sock: AsyncFD, ma: MultiAddress): bool =
## Bind socket ``sock`` to MultiAddress ``ma``.
##
## Note: This procedure only used in `go-libp2p-daemon` wrapper.
var
saddr: Sockaddr_storage
slen: SockLen
let maddr = initTAddress(ma)
if maddr.isErr():
return false
let address = maddr.tryGet()
toSAddr(address, saddr, slen)
if bindSocket(SocketHandle(sock), cast[ptr SockAddr](addr saddr),
slen) == 0:
result = true
else:
result = false
proc getLocalAddress*(sock: AsyncFD): TransportAddress =
## Retrieve local socket ``sock`` address.
##
## Note: This procedure only used in `go-libp2p-daemon` wrapper.
var saddr: Sockaddr_storage
var slen = SockLen(sizeof(Sockaddr_storage))
if getsockname(SocketHandle(sock), cast[ptr SockAddr](addr saddr),
addr slen) == 0:
fromSAddr(addr saddr, slen, result)