mirror of https://github.com/GNS3/gns3-server
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
3.3 KiB
113 lines
3.3 KiB
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2022 GNS3 Technologies Inc.
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import re
|
|
|
|
|
|
def is_ios_hostname_valid(hostname: str) -> bool:
|
|
"""
|
|
Check if an IOS hostname is valid
|
|
|
|
IOS hostname must start with a letter, end with a letter or digit, and
|
|
have as interior characters only letters, digits, and hyphens.
|
|
They must be 63 characters or fewer (ARPANET rules).
|
|
"""
|
|
|
|
if re.search(r"""^(?!-|[0-9])[a-zA-Z0-9-]{1,63}(?<!-)$""", hostname):
|
|
return True
|
|
return False
|
|
|
|
|
|
def to_ios_hostname(name):
|
|
"""
|
|
Convert name to an IOS hostname
|
|
"""
|
|
|
|
# Replace invalid characters with hyphens
|
|
name = re.sub(r'[^a-zA-Z0-9-]', '-', name)
|
|
|
|
# Ensure the hostname starts with a letter
|
|
if not re.search(r'^[a-zA-Z]', name):
|
|
name = 'a' + name
|
|
|
|
# Ensure the hostname ends with a letter or digit
|
|
if not re.search(r'[a-zA-Z0-9]$', name):
|
|
name = name.rstrip('-') + '0'
|
|
|
|
# Truncate the hostname to 63 characters
|
|
name = name[:63]
|
|
|
|
return name
|
|
|
|
|
|
def is_rfc1123_hostname_valid(hostname: str) -> bool:
|
|
"""
|
|
Check if a hostname is valid according to RFC 1123
|
|
|
|
Each element of the hostname must be from 1 to 63 characters long
|
|
and the entire hostname, including the dots, can be at most 253
|
|
characters long. Valid characters for hostnames are ASCII
|
|
letters from a to z, the digits from 0 to 9, and the hyphen (-).
|
|
A hostname may not start with a hyphen.
|
|
"""
|
|
|
|
if hostname[-1] == ".":
|
|
hostname = hostname[:-1] # strip exactly one dot from the right, if present
|
|
|
|
if len(hostname) > 253:
|
|
return False
|
|
|
|
labels = hostname.split(".")
|
|
|
|
# the TLD must be not all-numeric
|
|
if re.match(r"[0-9]+$", labels[-1]):
|
|
return False
|
|
|
|
allowed = re.compile(r"(?!-)[a-zA-Z0-9-]{1,63}(?<!-)$")
|
|
return all(allowed.match(label) for label in labels)
|
|
|
|
|
|
def to_rfc1123_hostname(name: str) -> str:
|
|
"""
|
|
Convert name to RFC 1123 hostname
|
|
"""
|
|
|
|
# Replace invalid characters with hyphens
|
|
name = re.sub(r'[^a-zA-Z0-9-.]', '-', name)
|
|
|
|
# Remove trailing dot if it exists
|
|
name = name.rstrip('.')
|
|
|
|
# Ensure each label is not longer than 63 characters
|
|
labels = name.split('.')
|
|
labels = [label[:63] for label in labels]
|
|
|
|
# Remove leading and trailing hyphens from each label if they exist
|
|
labels = [label.strip('-') for label in labels]
|
|
|
|
# Check if the TLD is all-numeric and if so, replace it with "invalid"
|
|
if re.match(r"[0-9]+$", labels[-1]):
|
|
labels[-1] = 'invalid'
|
|
|
|
# Join the labels back together
|
|
name = '.'.join(labels)
|
|
|
|
# Ensure the total length is not longer than 253 characters
|
|
name = name[:253]
|
|
|
|
return name
|