Current File : //lib/python3/dist-packages/mitmproxy/net/check.py
import ipaddress
import re
# Allow underscore in host name
# Note: This could be a DNS label, a hostname, a FQDN, or an IP
from typing import AnyStr
_label_valid = re.compile(br"[A-Z\d\-_]{1,63}$", re.IGNORECASE)
def is_valid_host(host: AnyStr) -> bool:
"""
Checks if the passed bytes are a valid DNS hostname or an IPv4/IPv6 address.
"""
if isinstance(host, str):
try:
host_bytes = host.encode("idna")
except UnicodeError:
return False
else:
host_bytes = host
try:
host_bytes.decode("idna")
except ValueError:
return False
# RFC1035: 255 bytes or less.
if len(host_bytes) > 255:
return False
if host_bytes and host_bytes.endswith(b"."):
host_bytes = host_bytes[:-1]
# DNS hostname
if all(_label_valid.match(x) for x in host_bytes.split(b".")):
return True
# IPv4/IPv6 address
try:
ipaddress.ip_address(host_bytes.decode('idna'))
return True
except ValueError:
return False
def is_valid_port(port: int) -> bool:
return 0 <= port <= 65535
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