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minor changes

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This commit is contained in:
Maximilian Hils 2017-02-21 13:00:04 +01:00 committed by GitHub
parent 11134b669e
commit aa6b0f299e
1 changed files with 6 additions and 3 deletions
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9
mitmproxy/net/check.py
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@ -1,5 +1,5 @@
import ipaddress
import re
from ipaddress import ip_address
# Allow underscore in host name
_label_valid = re.compile(b"(?!-)[A-Z\d\-_]{1,63}(?<!-)$", re.IGNORECASE)
@ -7,20 +7,23 @@ _label_valid = re.compile(b"(?!-)[A-Z\d\-_]{1,63}(?<!-)$", re.IGNORECASE)
def is_valid_host(host: bytes) -> bool:
"""
Checks if a hostname is valid.
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:
ip_address(host.decode('idna'))
ipaddress.ip_address(host.decode('idna'))
return True
except ValueError:
return False