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import ipaddress
import re
# Allow underscore in host name
# Note: This could be a DNS label, a hostname, a FQDN, or an IP
_label_valid = re.compile(br"[A-Z\d\-_]{1,63}$", re.IGNORECASE)
def is_valid_host(host: bytes) -> bool:
"""
Checks if the passed bytes are a valid DNS hostname or an IPv4/IPv6 address.
"""
try:
host.decode("idna")
except ValueError:
return False
# RFC1035: 255 bytes or less.
if len(host) > 255:
return False
if host and host[-1:] == b".":
host = host[:-1]
# DNS hostname
if all(_label_valid.match(x) for x in host.split(b".")):
return True
# IPv4/IPv6 address
try:
ipaddress.ip_address(host.decode('idna'))
return True
except ValueError:
return False
def is_valid_port(port: int) -> bool:
return 0 <= port <= 65535
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