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ips.go
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ips.go
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package server
import (
"net"
"go.uber.org/zap"
"github.com/status-im/status-go/logutils"
)
var (
LocalHostIP = net.IP{127, 0, 0, 1}
Localhost = "Localhost"
)
func GetOutboundIP() (net.IP, error) {
conn, err := net.Dial("udp", "255.255.255.255:8080")
if err != nil {
return nil, err
}
defer conn.Close()
localAddr := conn.LocalAddr().(*net.UDPAddr)
return localAddr.IP, nil
}
// addrToIPNet casts addr to IPNet.
// Returns nil if addr is not of IPNet type.
func addrToIPNet(addr net.Addr) *net.IPNet {
switch v := addr.(type) {
case *net.IPNet:
return v
default:
return nil
}
}
// filterAddressesForPairingServer filters private unicast addresses.
// ips is a 2-dimensional array, where each sub-array is a list of IP
// addresses for a single network interface.
func filterAddressesForPairingServer(ips [][]net.IP) []net.IP {
var result []net.IP
for _, niIps := range ips {
var ipv4, ipv6 []net.IP
for _, ip := range niIps {
// Only take private global unicast addrs
if !ip.IsGlobalUnicast() || !ip.IsPrivate() {
continue
}
if v := ip.To4(); v != nil {
ipv4 = append(ipv4, ip)
} else {
ipv6 = append(ipv6, ip)
}
}
// Prefer IPv4 over IPv6 for shorter connection string
if len(ipv4) == 0 {
result = append(result, ipv6...)
} else {
result = append(result, ipv4...)
}
}
return result
}
// getLocalAddresses returns an array of all addresses
// of all available network interfaces.
func getLocalAddresses() ([][]net.IP, error) {
nis, err := net.Interfaces()
if err != nil {
return nil, err
}
var ips [][]net.IP
for _, ni := range nis {
var niIps []net.IP
addrs, err := ni.Addrs()
if err != nil {
logutils.ZapLogger().Warn("failed to get addresses of network interface",
zap.String("networkInterface", ni.Name),
zap.Error(err))
continue
}
for _, addr := range addrs {
var ip net.IP
if ipNet := addrToIPNet(addr); ipNet == nil {
continue
} else {
ip = ipNet.IP
}
niIps = append(niIps, ip)
}
if len(niIps) > 0 {
ips = append(ips, niIps)
}
}
return ips, nil
}
// GetLocalAddressesForPairingServer is a high-level func
// that returns a list of addresses to be used by local pairing server.
func GetLocalAddressesForPairingServer() ([]net.IP, error) {
ips, err := getLocalAddresses()
if err != nil {
return nil, err
}
return filterAddressesForPairingServer(ips), nil
}
// findReachableAddresses returns a filtered remoteIps array,
// in which each IP matches one or more of given localNets.
func findReachableAddresses(remoteIPs []net.IP, localNets []net.IPNet) []net.IP {
var result []net.IP
for _, localNet := range localNets {
for _, remoteIP := range remoteIPs {
if localNet.Contains(remoteIP) {
result = append(result, remoteIP)
}
}
}
return result
}
// getAllAvailableNetworks collects all networks
// from available network interfaces.
func getAllAvailableNetworks() ([]net.IPNet, error) {
var localNets []net.IPNet
nis, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, ni := range nis {
addrs, err := ni.Addrs()
if err != nil {
logutils.ZapLogger().Warn("failed to get addresses of network interface",
zap.String("networkInterface", ni.Name),
zap.Error(err))
continue
}
for _, localAddr := range addrs {
localNets = append(localNets, *addrToIPNet(localAddr))
}
}
return localNets, nil
}
// FindReachableAddressesForPairingClient is a high-level func
// that returns a reachable server's address to be used by local pairing client.
func FindReachableAddressesForPairingClient(serverIps []net.IP) ([]net.IP, error) {
nets, err := getAllAvailableNetworks()
if err != nil {
return nil, err
}
return findReachableAddresses(serverIps, nets), nil
}