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import re
_label_valid = re.compile(b"(?!-)[A-Z\d-]{1,63}(?<!-)$", re.IGNORECASE)
def is_valid_host(host: bytes) -> bool:
"""
Checks if a hostname is valid.
"""
try:
host.decode("idna")
except ValueError:
return False
if len(host) > 255:
return False
if host and host[-1:] == b".":
host = host[:-1]
return all(_label_valid.match(x) for x in host.split(b"."))
def is_valid_port(port):
return 0 <= port <= 65535
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