Framerfinder.swift

//
//  FramerFinder.swift
//  fridge
//
//  Created by Jay Stakelon on 1/1/16.
//
//

import Foundation

class FramerFinder : NSObject {
    
    struct NetInfo {
        let ip: String
        let netmask: String
    }
    
    func findFramerServer() -> String {
        var serverPath:String?
        serverPath = getMyIP()
        return serverPath!
    }
    
    // Get the local ip addresses used by this node
    func getMyIP() -> String {
        //        var addresses = [NetInfo]()
        var ipaddress = String()
        
        // Get list of all interfaces on the local machine:
        var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
        if getifaddrs(&ifaddr) == 0 {
            
            // For each interface ...
            for (var ptr = ifaddr; ptr != nil; ptr = ptr.memory.ifa_next) {
                let flags = Int32(ptr.memory.ifa_flags)
                var addr = ptr.memory.ifa_addr.memory
                
                // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
                if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                    if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
                        
                        // Convert interface address to a human readable string:
                        var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
                        if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
                            nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                                if let address = String.fromCString(hostname) {
                                    
                                    var net = ptr.memory.ifa_netmask.memory
                                    var netmaskName = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
                                    getnameinfo(&net, socklen_t(net.sa_len), &netmaskName, socklen_t(netmaskName.count),
                                        nil, socklen_t(0), NI_NUMERICHOST) == 0
                                    if let _ = String.fromCString(netmaskName) {
                                        //                                        addresses.append(NetInfo(ip: address, netmask: netmask))
                                        ipaddress = address
                                    }
                                }
                        }
                    }
                }
            }
            freeifaddrs(ifaddr)
        }
        return ipaddress
    }
}