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convert.go
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convert.go
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package manet
import (
"fmt"
"net"
"strings"
utp "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/h2so5/utp"
ma "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multiaddr"
)
var errIncorrectNetAddr = fmt.Errorf("incorrect network addr conversion")
// FromNetAddr converts a net.Addr type to a Multiaddr.
func FromNetAddr(a net.Addr) (ma.Multiaddr, error) {
switch a.Network() {
case "tcp", "tcp4", "tcp6":
ac, ok := a.(*net.TCPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get IP Addr
ipm, err := FromIP(ac.IP)
if err != nil {
return nil, errIncorrectNetAddr
}
// Get TCP Addr
tcpm, err := ma.NewMultiaddr(fmt.Sprintf("/tcp/%d", ac.Port))
if err != nil {
return nil, errIncorrectNetAddr
}
// Encapsulate
return ipm.Encapsulate(tcpm), nil
case "udp", "upd4", "udp6":
ac, ok := a.(*net.UDPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get IP Addr
ipm, err := FromIP(ac.IP)
if err != nil {
return nil, errIncorrectNetAddr
}
// Get UDP Addr
udpm, err := ma.NewMultiaddr(fmt.Sprintf("/udp/%d", ac.Port))
if err != nil {
return nil, errIncorrectNetAddr
}
// Encapsulate
return ipm.Encapsulate(udpm), nil
case "utp", "utp4", "utp6":
acc, ok := a.(*utp.Addr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get UDP Addr
ac, ok := acc.Addr.(*net.UDPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get IP Addr
ipm, err := FromIP(ac.IP)
if err != nil {
return nil, errIncorrectNetAddr
}
// Get UDP Addr
utpm, err := ma.NewMultiaddr(fmt.Sprintf("/udp/%d/utp", ac.Port))
if err != nil {
return nil, errIncorrectNetAddr
}
// Encapsulate
return ipm.Encapsulate(utpm), nil
case "ip", "ip4", "ip6":
ac, ok := a.(*net.IPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
return FromIP(ac.IP)
case "ip+net":
ac, ok := a.(*net.IPNet)
if !ok {
return nil, errIncorrectNetAddr
}
return FromIP(ac.IP)
default:
return nil, fmt.Errorf("unknown network %v", a.Network())
}
}
// ToNetAddr converts a Multiaddr to a net.Addr
// Must be ThinWaist. acceptable protocol stacks are:
// /ip{4,6}/{tcp, udp}
func ToNetAddr(maddr ma.Multiaddr) (net.Addr, error) {
network, host, err := DialArgs(maddr)
if err != nil {
return nil, err
}
switch network {
case "tcp", "tcp4", "tcp6":
return net.ResolveTCPAddr(network, host)
case "udp", "udp4", "udp6":
return net.ResolveUDPAddr(network, host)
case "utp", "utp4", "utp6":
return utp.ResolveAddr(network, host)
case "ip", "ip4", "ip6":
return net.ResolveIPAddr(network, host)
}
return nil, fmt.Errorf("network not supported: %s", network)
}
// FromIP converts a net.IP type to a Multiaddr.
func FromIP(ip net.IP) (ma.Multiaddr, error) {
switch {
case ip.To4() != nil:
return ma.NewMultiaddr("/ip4/" + ip.String())
case ip.To16() != nil:
return ma.NewMultiaddr("/ip6/" + ip.String())
default:
return nil, errIncorrectNetAddr
}
}
// DialArgs is a convenience function returning arguments for use in net.Dial
func DialArgs(m ma.Multiaddr) (string, string, error) {
if !IsThinWaist(m) {
return "", "", fmt.Errorf("%s is not a 'thin waist' address", m)
}
str := m.String()
parts := strings.Split(str, "/")[1:]
if len(parts) == 2 { // only IP
return parts[0], parts[1], nil
}
network := parts[2]
if parts[2] == "udp" && len(parts) > 4 && parts[4] == "utp" {
network = parts[4]
}
var host string
switch parts[0] {
case "ip4":
network = network + "4"
host = strings.Join([]string{parts[1], parts[3]}, ":")
case "ip6":
network = network + "6"
host = fmt.Sprintf("[%s]:%s", parts[1], parts[3])
}
return network, host, nil
}