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Merge pull request #2 from depoon/update-modifier
Introduce initializeUsingRandomPortNumber
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // LocalhostPort.swift | ||
| // SwiftLocalhost | ||
| // | ||
| // Created by Kenneth Poon on 27/12/18. | ||
| // Copyright © 2018 Kenneth Poon. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
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| public class LocalhostPort { | ||
|
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| public static func availablePortNumber() -> UInt16 { | ||
| for i in 50000..<65000 { | ||
| let (isFree, _) = checkTcpPortForListen(port: UInt16(i)) | ||
| if isFree == true { | ||
| return UInt16(i) | ||
| } | ||
| } | ||
| return 0 | ||
| } | ||
|
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| static func checkTcpPortForListen(port: in_port_t) -> (Bool, descr: String) { | ||
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| let socketFileDescriptor = socket(AF_INET, SOCK_STREAM, 0) | ||
| if socketFileDescriptor == -1 { | ||
| return (false, "SocketCreationFailed, \(descriptionOfLastError())") | ||
| } | ||
|
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| var addr = sockaddr_in() | ||
| let sizeOfSockkAddr = MemoryLayout<sockaddr_in>.size | ||
| addr.sin_len = __uint8_t(sizeOfSockkAddr) | ||
| addr.sin_family = sa_family_t(AF_INET) | ||
| addr.sin_port = Int(OSHostByteOrder()) == OSLittleEndian ? _OSSwapInt16(port) : port | ||
| addr.sin_addr = in_addr(s_addr: inet_addr("0.0.0.0")) | ||
| addr.sin_zero = (0, 0, 0, 0, 0, 0, 0, 0) | ||
| var bind_addr = sockaddr() | ||
| memcpy(&bind_addr, &addr, Int(sizeOfSockkAddr)) | ||
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| if Darwin.bind(socketFileDescriptor, &bind_addr, socklen_t(sizeOfSockkAddr)) == -1 { | ||
| let details = descriptionOfLastError() | ||
| release(socket: socketFileDescriptor) | ||
| return (false, "\(port), BindFailed, \(details)") | ||
| } | ||
| if listen(socketFileDescriptor, SOMAXCONN ) == -1 { | ||
| let details = descriptionOfLastError() | ||
| release(socket: socketFileDescriptor) | ||
| return (false, "\(port), ListenFailed, \(details)") | ||
| } | ||
| release(socket: socketFileDescriptor) | ||
| return (true, "\(port) is free for use") | ||
| } | ||
|
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| static func release(socket: Int32) { | ||
| Darwin.shutdown(socket, SHUT_RDWR) | ||
| close(socket) | ||
| } | ||
|
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| static func descriptionOfLastError() -> String { | ||
| return String.init(cString: (UnsafePointer(strerror(errno)))) | ||
| } | ||
| } |
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