Function parseIP

net_ip_socket.go:140–160

the /proc/net/{t,u}dp{,6} files are network byte order for ipv4 and for ipv6 the address is four words consisting of four bytes each. In each of those four words the four bytes are written in reverse order.

(hexIP string)

// the /proc/net/{t,u}dp{,6} files are network byte order for ipv4 and for ipv6 the address is four words consisting of four bytes each. In each of those four words the four bytes are written in reverse order.

func parseIP(hexIP string) (net.IP, error) {
	var byteIP []byte
	byteIP, err := hex.DecodeString(hexIP)
	if err != nil {
		return nil, fmt.Errorf("%w: Cannot parse socket field in %q: %w", ErrFileParse, hexIP, err)
	}
	switch len(byteIP) {
	case 4:
		return net.IP{byteIP[3], byteIP[2], byteIP[1], byteIP[0]}, nil
	case 16:
		i := net.IP{
			byteIP[3], byteIP[2], byteIP[1], byteIP[0],
			byteIP[7], byteIP[6], byteIP[5], byteIP[4],
			byteIP[11], byteIP[10], byteIP[9], byteIP[8],
			byteIP[15], byteIP[14], byteIP[13], byteIP[12],
		}
		return i, nil
	default:
		return nil, fmt.Errorf("%w: Unable to parse IP %s: %v", ErrFileParse, hexIP, nil)
	}
}

// parseNetIPSocketLine parses a single line, represented by a list of fields.
func parseNetIPSocketLine(fields []string, isUDP bool) (*netIPSocketLine, error) {