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add support for connected UDP sockets #35

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add support for connected UDP sockets #35

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39 changes: 37 additions & 2 deletions wasip1/listen_wasip1.go
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Original file line number Diff line number Diff line change
Expand Up @@ -44,13 +44,37 @@ func ListenPacket(network, address string) (net.PacketConn, error) {
addr := &netAddr{network, address}
return nil, listenErr(addr, err)
}
conn, err := listenPacketAddr(addrs[0])
conn, err := listenPacketAddr(addrs[0], nil)
if err != nil {
return nil, listenErr(addrs[0], err)
}
return conn, nil
}

// DialUDP connects to the remote UDP network address from the local UDP network address.
func DialUDP(network, localAddr, remoteAddr string) (net.PacketConn, error) {
switch network {
case "udp", "udp4", "udp6":
default:
return nil, unsupportedNetwork(network, localAddr)
}
laddrs, err := lookupAddr(context.Background(), "listen", network, localAddr)
if err != nil {
addr := &netAddr{network, localAddr}
return nil, listenErr(addr, err)
}
raddrs, err := lookupAddr(context.Background(), "dial", network, remoteAddr)
if err != nil {
addr := &netAddr{network, localAddr}
return nil, dialErr(addr, err)
}
conn, err := listenPacketAddr(laddrs[0], raddrs[0])
if err != nil {
return nil, listenErr(laddrs[0], err)
}
return conn, nil
}

func unsupportedNetwork(network, address string) error {
return fmt.Errorf("unsupported network: %s://%s", network, address)
}
Expand Down Expand Up @@ -105,7 +129,8 @@ func listenAddr(addr net.Addr) (net.Listener, error) {
return makeListener(l, name), nil
}

func listenPacketAddr(addr net.Addr) (net.PacketConn, error) {
// If remoteAddr is set, the socket will be connected to that address.
func listenPacketAddr(addr net.Addr, remoteAddr net.Addr) (net.PacketConn, error) {
fd, err := socket(family(addr), SOCK_DGRAM, 0)
if err != nil {
return nil, os.NewSyscallError("socket", err)
Expand All @@ -131,6 +156,16 @@ func listenPacketAddr(addr net.Addr) (net.PacketConn, error) {
return nil, os.NewSyscallError("bind", err)
}

if remoteAddr != nil {
remoteSockAddr, err := socketAddress(remoteAddr)
if err != nil {
return nil, os.NewSyscallError("connect", err)
}
if err := connect(fd, remoteSockAddr); err != nil {
return nil, os.NewSyscallError("connect", err)
}
}

name, err := getsockname(fd)
if err != nil {
return nil, os.NewSyscallError("getsockname", err)
Expand Down