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#!/usr/bin/python
#
# Copyright 2011 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Common library for network ports and protocol handling."""
__author__ = 'watson@google.com (Tony Watson)'
class Error(Exception):
"""Base error class."""
class BadPortValue(Error):
"""Invalid port format."""
class BadPortRange(Error):
"""Invalid port range."""
def Port(port):
"""Sanitize a port value.
Args:
port: a port value
Returns:
port: a port value
Raises:
BadPortValue: port is not valid integer or string
BadPortRange: port is outside valid range
"""
pval = -1
try:
pval = int(port)
except ValueError:
raise BadPortValue('port %s is not valid.' % port)
if pval < 0 or pval > 65535:
raise BadPortRange('port %s is out of range 0-65535.' % port)
return pval
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