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|
package ice
import (
"net"
"github.com/pion/logging"
"github.com/pion/transport/v2"
)
// The conditions of invalidation written below are defined in
// https://tools.ietf.org/html/rfc8445#section-5.1.1.1
func isSupportedIPv6(ip net.IP) bool {
if len(ip) != net.IPv6len ||
isZeros(ip[0:12]) || // !(IPv4-compatible IPv6)
ip[0] == 0xfe && ip[1]&0xc0 == 0xc0 || // !(IPv6 site-local unicast)
ip.IsLinkLocalUnicast() ||
ip.IsLinkLocalMulticast() {
return false
}
return true
}
func isZeros(ip net.IP) bool {
for i := 0; i < len(ip); i++ {
if ip[i] != 0 {
return false
}
}
return true
}
func localInterfaces(n transport.Net, interfaceFilter func(string) bool, ipFilter func(net.IP) bool, networkTypes []NetworkType, includeLoopback bool) ([]net.IP, error) { //nolint:gocognit
ips := []net.IP{}
ifaces, err := n.Interfaces()
if err != nil {
return ips, err
}
var IPv4Requested, IPv6Requested bool
for _, typ := range networkTypes {
if typ.IsIPv4() {
IPv4Requested = true
}
if typ.IsIPv6() {
IPv6Requested = true
}
}
for _, iface := range ifaces {
if iface.Flags&net.FlagUp == 0 {
continue // interface down
}
if (iface.Flags&net.FlagLoopback != 0) && !includeLoopback {
continue // loopback interface
}
if interfaceFilter != nil && !interfaceFilter(iface.Name) {
continue
}
addrs, err := iface.Addrs()
if err != nil {
continue
}
for _, addr := range addrs {
var ip net.IP
switch addr := addr.(type) {
case *net.IPNet:
ip = addr.IP
case *net.IPAddr:
ip = addr.IP
}
if ip == nil || (ip.IsLoopback() && !includeLoopback) {
continue
}
if ipv4 := ip.To4(); ipv4 == nil {
if !IPv6Requested {
continue
} else if !isSupportedIPv6(ip) {
continue
}
} else if !IPv4Requested {
continue
}
if ipFilter != nil && !ipFilter(ip) {
continue
}
ips = append(ips, ip)
}
}
return ips, nil
}
func listenUDPInPortRange(n transport.Net, log logging.LeveledLogger, portMax, portMin int, network string, lAddr *net.UDPAddr) (transport.UDPConn, error) {
if (lAddr.Port != 0) || ((portMin == 0) && (portMax == 0)) {
return n.ListenUDP(network, lAddr)
}
var i, j int
i = portMin
if i == 0 {
i = 1
}
j = portMax
if j == 0 {
j = 0xFFFF
}
if i > j {
return nil, ErrPort
}
portStart := globalMathRandomGenerator.Intn(j-i+1) + i
portCurrent := portStart
for {
lAddr = &net.UDPAddr{IP: lAddr.IP, Port: portCurrent}
c, e := n.ListenUDP(network, lAddr)
if e == nil {
return c, e //nolint:nilerr
}
log.Debugf("failed to listen %s: %v", lAddr.String(), e)
portCurrent++
if portCurrent > j {
portCurrent = i
}
if portCurrent == portStart {
break
}
}
return nil, ErrPort
}
|
