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net/portmapper: ignore IGD SSDP responses from !defaultgw #3202

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merged 1 commit into from Oct 27, 2021
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net/portmapper: ignore IGD SSDP responses from !defaultgw #3202

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6 changes: 5 additions & 1 deletion net/portmapper/portmapper.go
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Expand Up @@ -752,10 +752,14 @@ func (c *Client) Probe(ctx context.Context) (res ProbeResult, err error) {
}
return res, err
}
ip, ok := netaddr.FromStdIP(addr.(*net.UDPAddr).IP)
if !ok {
continue
}
port := uint16(addr.(*net.UDPAddr).Port)
switch port {
case c.upnpPort():
if mem.Contains(mem.B(buf[:n]), mem.S(":InternetGatewayDevice:")) {
if ip == gw && mem.Contains(mem.B(buf[:n]), mem.S(":InternetGatewayDevice:")) {
meta, err := parseUPnPDiscoResponse(buf[:n])
if err != nil {
c.logf("unrecognized UPnP discovery response; ignoring")
Expand Down