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60 lines
1.9 KiB
60 lines
1.9 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2022 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import re
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def is_ios_hostname_valid(hostname: str) -> bool:
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"""
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Check if an IOS hostname is valid
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IOS hostname must start with a letter, end with a letter or digit, and
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have as interior characters only letters, digits, and hyphens.
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They must be 63 characters or fewer (ARPANET rules).
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"""
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if re.search(r"""^(?!-|[0-9])[a-zA-Z0-9-]{1,63}(?<!-)$""", hostname):
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return True
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return False
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def is_rfc1123_hostname_valid(hostname: str) -> bool:
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"""
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Check if a hostname is valid according to RFC 1123
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Each element of the hostname must be from 1 to 63 characters long
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and the entire hostname, including the dots, can be at most 253
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characters long. Valid characters for hostnames are ASCII
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letters from a to z, the digits from 0 to 9, and the hyphen (-).
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A hostname may not start with a hyphen.
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"""
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if hostname[-1] == ".":
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hostname = hostname[:-1] # strip exactly one dot from the right, if present
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if len(hostname) > 253:
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return False
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labels = hostname.split(".")
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# the TLD must be not all-numeric
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if re.match(r"[0-9]+$", labels[-1]):
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return False
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allowed = re.compile(r"(?!-)[a-zA-Z0-9-]{1,63}(?<!-)$")
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return all(allowed.match(label) for label in labels)
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