Audit fixes

hub/api/db/sanitize-validate.go

@@ -55,7 +55,7 @@ func Network_Validate(c *Network) error {
 }
 
 func Peer_Sanitize(p *Peer) {
-	p.Name = strings.TrimSpace(p.Name)
+	p.Name = strings.TrimSpace(strings.ToLower(p.Name))
 	if len(p.Addr4) != 0 {
 		if addr, ok := netip.AddrFromSlice(p.Addr4); ok {
 			// Unmap so an IPv4-mapped form is stored canonically as 4 bytes.

peer/multicast/receiver.go

@@ -88,5 +88,5 @@ func multicastAddr(vpnIP netip.Addr) *net.UDPAddr {
 	b := vpnIP.As4()
 	return net.UDPAddrFromAddrPort(
 		netip.AddrPortFrom(
-			netip.AddrFrom4([4]byte{239, b[1], b[2], 0}), 4560))
+			netip.AddrFrom4([4]byte{239, b[0], b[1], b[2]}), 4560))
 }