问如何在swift中获取Ip地址

EN

#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int _interfaceAddressForName(char* interfaceName, struct sockaddr* interfaceAddress) {

    struct ifreq ifr;
    int fd = socket(AF_INET, SOCK_DGRAM, 0);
    ifr.ifr_addr.sa_family = AF_INET;

    strncpy(ifr.ifr_name, interfaceName, IFNAMSIZ-1);

    int ioctl_res;
    if ( (ioctl_res = ioctl(fd, SIOCGIFADDR, &ifr)) < 0){
        return ioctl_res;
    }

    close(fd);
    memcpy(interfaceAddress, &ifr.ifr_addr, sizeof(struct sockaddr));
    return 0;
}

public enum Error:ErrorType {
    case IOCTLFailed(Int32)
    case StringIsNotAnASCIIString
}

public func interfaceAddress(forInterfaceWithName interfaceName: String) throws -> sockaddr_in {

    guard let cString = interfaceName.cStringUsingEncoding(NSASCIIStringEncoding) else {
        throw Error.StringIsNotAnASCIIString
    }

    let addressPtr = UnsafeMutablePointer<sockaddr>.alloc(1)
    let ioctl_res = _interfaceAddressForName(strdup(cString), addressPtr)
    let address = addressPtr.move()
    addressPtr.dealloc(1)

    if ioctl_res < 0 {
        throw Error.IOCTLFailed(errno)
    } else {
        return unsafeBitCast(address, sockaddr_in.self)
    }
}

let interfaceName = "en0"
do {
    let wlanInterfaceAddress = try interfaceAddress(forInterfaceWithName: interfaceName)
    print(String.fromCString(inet_ntoa(wlanInterfaceAddress.sin_addr))!)
} catch {
    if case Error.IOCTLFailed(let errno) = error where errno == ENXIO {
        print("interface(\(interfaceName)) is not available")
    } else {
        print(error)
    }
}

public func interfaceNames() -> [String] {

    let MAX_INTERFACES = 128;

    var interfaceNames = [String]()
    let interfaceNamePtr = UnsafeMutablePointer<Int8>.alloc(Int(IF_NAMESIZE))
    for interfaceIndex in 1...MAX_INTERFACES {
        if (if_indextoname(UInt32(interfaceIndex), interfaceNamePtr) != nil){
            if let interfaceName = String.fromCString(interfaceNamePtr) {
                interfaceNames.append(interfaceName)
            }
        } else {
            break
        }
    }

    interfaceNamePtr.dealloc(Int(IF_NAMESIZE))
    return interfaceNames
}

   func getIfConfigOutput() -> [String:String] {
    let cmd = "for i in $(ifconfig -lu); do if ifconfig $i | grep -q \"status: active\" ; then echo $i; fi; done"
    let interfaceString = shell(cmd)
    let interfaceArray = interfaceString.components(separatedBy: "\n")
    var finalDictionary:[String:String] = [String:String]()
    for (i,_) in interfaceArray.enumerated() {
        if (interfaceArray[i].hasPrefix("en")){
            let sp = shell("ifconfig \(interfaceArray[i]) | grep \"inet \" | grep -v 127.0.0.1 | cut -d\\  -f2")
          finalDictionary[interfaceArray[i]] = sp.replacingOccurrences(of: "\n", with: "")
        }
    }
  print(finalDictionary)
    return finalDictionary
}
func shell(_ args: String) -> String {
    var outstr = ""
    let task = Process()
    task.launchPath = "/bin/sh"
    task.arguments = ["-c", args]
    let pipe = Pipe()
    task.standardOutput = pipe
    task.launch()
    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    if let output = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
        outstr = output as String
    }
    task.waitUntilExit()
    return outstr
}

private enum AddressRequestType {
    case ipAddress
    case netmask
}

// From BDS ioccom.h
// Macro to create ioctl request
private static func _IOC (_ io: UInt32, _ group: UInt32, _ num: UInt32, _ len: UInt32) -> UInt32 {
    let rv = io | (( len & UInt32(IOCPARM_MASK)) << 16) | ((group << 8) | num)
    return rv
}

// Macro to create read/write IOrequest
private static func _IOWR (_ group: Character , _ num : UInt32, _ size: UInt32) -> UInt32 {
    return _IOC(IOC_INOUT, UInt32 (group.asciiValue!), num, size)
}

private static func _interfaceAddressForName (_ name: String, _ requestType: AddressRequestType) throws -> String {
    
    var ifr = ifreq ()
    ifr.ifr_ifru.ifru_addr.sa_family = sa_family_t(AF_INET)
    
    // Copy the name into a zero padded 16 CChar buffer
    
    let ifNameSize = Int (IFNAMSIZ)
    var b = [CChar] (repeating: 0, count: ifNameSize)
    strncpy (&b, name, ifNameSize)
    
    // Convert the buffer to a 16 CChar tuple - that's what ifreq needs
    ifr.ifr_name = (b [0], b [1], b [2], b [3], b [4], b [5], b [6], b [7], b [8], b [9], b [10], b [11], b [12], b [13], b [14], b [15])
    
    let ioRequest: UInt32 = {
        switch requestType {
        case .ipAddress: return _IOWR("i", 33, UInt32(MemoryLayout<ifreq>.size))    // Magic number SIOCGIFADDR - see sockio.h
        case .netmask: return _IOWR("i", 37, UInt32(MemoryLayout<ifreq>.size))      // Magic number SIOCGIFNETMASK
        }
    } ()
    
    if ioctl(socket(AF_INET, SOCK_DGRAM, 0), UInt(ioRequest), &ifr) < 0 {
        throw POSIXError (POSIXErrorCode (rawValue: errno) ?? POSIXErrorCode.EINVAL)
    }
    
    let sin = unsafeBitCast(ifr.ifr_ifru.ifru_addr, to: sockaddr_in.self)
    let rv = String (cString: inet_ntoa (sin.sin_addr))
    
    return rv
}

public static func getInterfaceIPAddress (interfaceName: String) throws -> String {
    return try _interfaceAddressForName(interfaceName, .ipAddress)
}

public static func getInterfaceNetMask (interfaceName: String) throws -> String {
    return try _interfaceAddressForName(interfaceName, .netmask)
}