142 lines
5.4 KiB
Nim
142 lines
5.4 KiB
Nim
## Nim-Libp2p
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## Copyright (c) 2018 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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## This module implements wire network connection procedures.
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import chronos
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import multiaddress, multicodec
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when defined(windows):
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import winlean
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else:
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import posix
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proc initTAddress*(ma: MultiAddress): TransportAddress =
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## Initialize ``TransportAddress`` with MultiAddress ``ma``.
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##
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## MultiAddress must be wire address, e.g. ``{IP4, IP6, UNIX}/{TCP, UDP}``.
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var state = 0
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var pbuf: array[2, byte]
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for rpart in ma.items():
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let
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part = rpart.tryGet()
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rcode = part.protoCode()
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code = rcode.tryGet()
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if state == 0:
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if code == multiCodec("ip4"):
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result = TransportAddress(family: AddressFamily.IPv4)
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if part.protoArgument(result.address_v4).tryGet() == 0:
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raise newException(TransportAddressError, "Incorrect IPv4 address")
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inc(state)
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elif code == multiCodec("ip6"):
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result = TransportAddress(family: AddressFamily.IPv6)
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if part.protoArgument(result.address_v6).tryGet() == 0:
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raise newException(TransportAddressError, "Incorrect IPv6 address")
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inc(state)
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elif code == multiCodec("unix"):
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result = TransportAddress(family: AddressFamily.Unix)
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if part.protoArgument(result.address_un).tryGet() == 0:
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raise newException(TransportAddressError, "Incorrect Unix address")
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result.port = Port(1)
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break
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else:
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raise newException(TransportAddressError, "Could not initialize address!")
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elif state == 1:
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if code == multiCodec("tcp") or code == multiCodec("udp"):
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if part.protoArgument(pbuf).tryGet() == 0:
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raise newException(TransportAddressError, "Incorrect port")
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result.port = Port((cast[uint16](pbuf[0]) shl 8) or
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cast[uint16](pbuf[1]))
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break
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else:
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raise newException(TransportAddressError, "Could not initialize address!")
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proc connect*(ma: MultiAddress, bufferSize = DefaultStreamBufferSize,
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child: StreamTransport = nil): Future[StreamTransport] {.async.} =
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## Open new connection to remote peer with address ``ma`` and create
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## new transport object ``StreamTransport`` for established connection.
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## ``bufferSize`` is size of internal buffer for transport.
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let address = initTAddress(ma)
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if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
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if ma[1].tryGet().protoCode().tryGet() != multiCodec("tcp"):
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raise newException(TransportAddressError, "Incorrect address type!")
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result = await connect(address, bufferSize, child)
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proc createStreamServer*[T](ma: MultiAddress,
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cbproc: StreamCallback,
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flags: set[ServerFlags] = {},
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udata: ref T,
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sock: AsyncFD = asyncInvalidSocket,
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backlog: int = 100,
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bufferSize: int = DefaultStreamBufferSize,
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child: StreamServer = nil,
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init: TransportInitCallback = nil): StreamServer =
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## Create new TCP stream server which bounds to ``ma`` address.
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var address = initTAddress(ma)
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if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
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if ma[1].tryGet().protoCode().tryGet() != multiCodec("tcp"):
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raise newException(TransportAddressError, "Incorrect address type!")
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result = createStreamServer(address, cbproc, flags, udata, sock, backlog,
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bufferSize, child, init)
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proc createAsyncSocket*(ma: MultiAddress): AsyncFD =
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## Create new asynchronous socket using MultiAddress' ``ma`` socket type and
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## protocol information.
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##
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## Returns ``asyncInvalidSocket`` on error.
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var
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socktype: SockType = SockType.SOCK_STREAM
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protocol: Protocol = Protocol.IPPROTO_TCP
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address: TransportAddress
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try:
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address = initTAddress(ma)
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except:
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return asyncInvalidSocket
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if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
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if ma[1].tryGet().protoCode().tryGet() == multiCodec("udp"):
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socktype = SockType.SOCK_DGRAM
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protocol = Protocol.IPPROTO_UDP
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elif ma[1].tryGet().protoCode().tryGet() == multiCodec("tcp"):
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socktype = SockType.SOCK_STREAM
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protocol = Protocol.IPPROTO_TCP
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elif address.family in {AddressFamily.Unix}:
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socktype = SockType.SOCK_STREAM
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protocol = cast[Protocol](0)
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else:
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return asyncInvalidSocket
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result = createAsyncSocket(address.getDomain(), socktype, protocol)
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proc bindAsyncSocket*(sock: AsyncFD, ma: MultiAddress): bool =
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## Bind socket ``sock`` to MultiAddress ``ma``.
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var
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saddr: Sockaddr_storage
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slen: SockLen
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address: TransportAddress
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try:
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address = initTAddress(ma)
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except:
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return false
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toSAddr(address, saddr, slen)
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if bindSocket(SocketHandle(sock), cast[ptr SockAddr](addr saddr), slen) == 0:
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result = true
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else:
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result = false
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proc getLocalAddress*(sock: AsyncFD): TransportAddress =
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## Retrieve local socket ``sock`` address.
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var saddr: Sockaddr_storage
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var slen = SockLen(sizeof(Sockaddr_storage))
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if getsockname(SocketHandle(sock), cast[ptr SockAddr](addr saddr),
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addr slen) == 0:
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fromSAddr(addr saddr, slen, result)
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