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https://github.com/openvswitch/ovs
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40f0ac48ff
We require python 3, so instead of manually parsing bytes on input we can use built-in bytes.fromhex(). This function ignores whitespaces, so we can use different input formats - the old style space-separated bytes as well as pure hex strings provided by ovs-ofctl compose-packet and ovs-pcap. Acked-by: Simon Horman <horms@ovn.org> Acked-by: Eelco Chaudron <echaudro@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
79 lines
2.6 KiB
Python
Executable File
79 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2018, 2020 VMware, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This program can be used send L2-L7 protocol messages using the hex bytes
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# of the packet, to test simple protocol scenarios. (e.g. generate simple
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# nsh packets to test nsh match fields/actions)
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#
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# Currently, the script supports sending the packets starting from the
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# Ethernet header. As a part of future enchancement, raw ip packet support
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# can also be added, and that's why there is "-t"/"--type" option
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#
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import socket
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import sys
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from optparse import OptionParser
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usage = "usage: %prog [OPTIONS] OUT-INTERFACE HEX-BYTES \n \
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bytes in HEX-BYTES must be separated by space(s)"
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parser = OptionParser(usage=usage)
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parser.add_option("-t", "--type", type="string", dest="packet_type",
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help="packet type ('eth' is the default PACKET_TYPE)",
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default="eth")
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(options, args) = parser.parse_args()
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# validate the arguments
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if len(args) < 2:
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parser.print_help()
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sys.exit(1)
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# validate the "-t" or "--type" option
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if options.packet_type != "eth":
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parser.error('invalid argument to "-t"/"--type". Allowed value is "eth".')
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# Strip '0x' prefixes from hex input, combine into a single string and
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# convert to bytes.
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hex_str = "".join([a[2:] if a.startswith("0x") else a for a in args[1:]])
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pkt = bytes.fromhex(hex_str)
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try:
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sockfd = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
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except socket.error as msg:
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print('unable to create socket! error code: ' + str(msg[0]) + ' : '
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+ msg[1])
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sys.exit(2)
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try:
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sockfd.bind((args[0], 0))
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except socket.error as msg:
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print('unable to bind socket! error code: ' + str(msg[0]) + ' : '
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+ msg[1])
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sys.exit(2)
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try:
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sockfd.send(pkt)
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except socket.error as msg:
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print('unable to send packet! error code: ' + str(msg[0]) + ' : '
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+ msg[1])
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sys.exit(2)
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print('send success!')
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sys.exit(0)
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