# # Chronos Handles # (c) Copyright 2018-Present # Status Research & Development GmbH # # Licensed under either of # Apache License, version 2.0, (LICENSE-APACHEv2) # MIT license (LICENSE-MIT) import net, nativesockets, asyncloop when defined(windows): import os, winlean const asyncInvalidSocket* = AsyncFD(-1) TCP_NODELAY* = 1 IPPROTO_TCP* = 6 PIPE_TYPE_BYTE = 0x00000000'i32 PIPE_READMODE_BYTE = 0x00000000'i32 PIPE_WAIT = 0x00000000'i32 DEFAULT_PIPE_SIZE = 65536'i32 ERROR_PIPE_CONNECTED = 535 ERROR_PIPE_BUSY = 231 pipeHeaderName = r"\\.\pipe\chronos\" proc connectNamedPipe(hNamedPipe: Handle, lpOverlapped: pointer): WINBOOL {.importc: "ConnectNamedPipe", stdcall, dynlib: "kernel32".} else: import os, posix const asyncInvalidSocket* = AsyncFD(posix.INVALID_SOCKET) TCP_NODELAY* = 1 IPPROTO_TCP* = 6 const asyncInvalidPipe* = asyncInvalidSocket proc setSocketBlocking*(s: SocketHandle, blocking: bool): bool = ## Sets blocking mode on socket. when defined(windows): result = true var mode = clong(ord(not blocking)) if ioctlsocket(s, FIONBIO, addr(mode)) == -1: result = false else: result = true var x: int = fcntl(s, F_GETFL, 0) if x == -1: result = false else: var mode = if blocking: x and not O_NONBLOCK else: x or O_NONBLOCK if fcntl(s, F_SETFL, mode) == -1: result = false proc setSockOpt*(socket: AsyncFD, level, optname, optval: int): bool = ## `setsockopt()` for integer options. ## Returns ``true`` on success, ``false`` on error. var value = cint(optval) result = setsockopt(SocketHandle(socket), cint(level), cint(optname), addr(value), SockLen(sizeof(value))) >= cint(0) proc setSockOpt*(socket: AsyncFD, level, optname: int, value: pointer, valuelen: int): bool = ## `setsockopt()` for custom options (pointer and length). ## Returns ``true`` on success, ``false`` on error. result = setsockopt(SocketHandle(socket), cint(level), cint(optname), value, SockLen(valuelen)) >= cint(0) proc getSockOpt*(socket: AsyncFD, level, optname: int, value: var int): bool = ## `getsockopt()` for integer options. ## Returns ``true`` on success, ``false`` on error. var res: cint var size = SockLen(sizeof(res)) if getsockopt(SocketHandle(socket), cint(level), cint(optname), addr(res), addr(size)) >= cint(0): value = int(res) result = true proc getSockOpt*(socket: AsyncFD, level, optname: int, value: pointer, valuelen: var int): bool = ## `getsockopt()` for custom options (pointer and length). ## Returns ``true`` on success, ``false`` on error. result = getsockopt(SocketHandle(socket), cint(level), cint(optname), value, cast[ptr Socklen](addr valuelen)) >= cint(0) proc getSocketError*(socket: AsyncFD, err: var int): bool = ## Recover error code associated with socket handle ``socket``. result = getSockOpt(socket, cint(SOL_SOCKET), cint(SO_ERROR), err) proc createAsyncSocket*(domain: Domain, sockType: SockType, protocol: Protocol): AsyncFD = ## Creates new asynchronous socket. ## Returns ``asyncInvalidSocket`` on error. let handle = createNativeSocket(domain, sockType, protocol) if handle == osInvalidSocket: return asyncInvalidSocket if not setSocketBlocking(handle, false): close(handle) return asyncInvalidSocket when defined(macosx) and not defined(nimdoc): if not setSockOpt(AsyncFD(handle), SOL_SOCKET, SO_NOSIGPIPE, 1): close(handle) return asyncInvalidSocket result = AsyncFD(handle) register(result) proc wrapAsyncSocket*(sock: SocketHandle): AsyncFD = ## Wraps socket to asynchronous socket handle. ## Return ``asyncInvalidSocket`` on error. if not setSocketBlocking(sock, false): close(sock) return asyncInvalidSocket when defined(macosx) and not defined(nimdoc): if not setSockOpt(AsyncFD(sock), SOL_SOCKET, SO_NOSIGPIPE, 1): close(sock) return asyncInvalidSocket result = AsyncFD(sock) register(result) proc getMaxOpenFiles*(): int = ## Returns maximum file descriptor number that can be opened by this process. ## ## Note: On Windows its impossible to obtain such number, so getMaxOpenFiles() ## will return constant value of 16384. You can get more information on this ## link https://docs.microsoft.com/en-us/archive/blogs/markrussinovich/pushing-the-limits-of-windows-handles when defined(windows): result = 16384 else: var limits: RLimit if getrlimit(posix.RLIMIT_NOFILE, limits) != 0: raiseOSError(osLastError()) result = int(limits.rlim_cur) proc setMaxOpenFiles*(count: int) = ## Set maximum file descriptor number that can be opened by this process. ## ## Note: On Windows its impossible to set this value, so it just a nop call. when defined(windows): discard else: var limits: RLimit if getrlimit(posix.RLIMIT_NOFILE, limits) != 0: raiseOSError(osLastError()) limits.rlim_cur = count if setrlimit(posix.RLIMIT_NOFILE, limits) != 0: raiseOSError(osLastError()) proc createAsyncPipe*(): tuple[read: AsyncFD, write: AsyncFD] = ## Create new asynchronouse pipe. ## Returns tuple of read pipe handle and write pipe handle``asyncInvalidPipe`` on error. when defined(windows): var pipeIn, pipeOut: Handle var pipeName: WideCString var uniq = 0'u64 var sa = SECURITY_ATTRIBUTES(nLength: sizeof(SECURITY_ATTRIBUTES).cint, lpSecurityDescriptor: nil, bInheritHandle: 0) while true: QueryPerformanceCounter(uniq) pipeName = newWideCString(pipeHeaderName & $uniq) var openMode = FILE_FLAG_FIRST_PIPE_INSTANCE or FILE_FLAG_OVERLAPPED or PIPE_ACCESS_INBOUND var pipeMode = PIPE_TYPE_BYTE or PIPE_READMODE_BYTE or PIPE_WAIT pipeIn = createNamedPipe(pipeName, openMode, pipeMode, 1'i32, DEFAULT_PIPE_SIZE, DEFAULT_PIPE_SIZE, 0'i32, addr sa) if pipeIn == INVALID_HANDLE_VALUE: let err = osLastError() # If error in {ERROR_ACCESS_DENIED, ERROR_PIPE_BUSY}, then named pipe # with such name already exists. if int32(err) != ERROR_ACCESS_DENIED and int32(err) != ERROR_PIPE_BUSY: result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return continue else: break var openMode = (GENERIC_WRITE or FILE_WRITE_DATA or SYNCHRONIZE) pipeOut = createFileW(pipeName, openMode, 0, addr(sa), OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0) if pipeOut == INVALID_HANDLE_VALUE: discard closeHandle(pipeIn) result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return var ovl = OVERLAPPED() let res = connectNamedPipe(pipeIn, cast[pointer](addr ovl)) if res == 0: let err = osLastError() if int32(err) == ERROR_PIPE_CONNECTED: discard elif int32(err) == ERROR_IO_PENDING: var bytesRead = 0.Dword if getOverlappedResult(pipeIn, addr ovl, bytesRead, 1) == 0: discard closeHandle(pipeIn) discard closeHandle(pipeOut) result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return else: discard closeHandle(pipeIn) discard closeHandle(pipeOut) result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return result = (read: AsyncFD(pipeIn), write: AsyncFD(pipeOut)) else: var fds: array[2, cint] if posix.pipe(fds) == -1: result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return if not(setSocketBlocking(SocketHandle(fds[0]), false)) or not(setSocketBlocking(SocketHandle(fds[1]), false)): result = (read: asyncInvalidPipe, write: asyncInvalidPipe) return result = (read: AsyncFD(fds[0]), write: AsyncFD(fds[1]))