1#!/usr/bin/env python3
2#
3#  Copyright (c) 2021, The OpenThread Authors.
4#  All rights reserved.
5#
6#  Redistribution and use in source and binary forms, with or without
7#  modification, are permitted provided that the following conditions are met:
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9#     notice, this list of conditions and the following disclaimer.
10#  2. Redistributions in binary form must reproduce the above copyright
11#     notice, this list of conditions and the following disclaimer in the
12#     documentation and/or other materials provided with the distribution.
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14#     names of its contributors may be used to endorse or promote products
15#     derived from this software without specific prior written permission.
16#
17#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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26#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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28#
29import socket
30import sys
31import ipaddress
32
33# USAGE: python3 udp_send.py [destination_ipv6] [destination_port] [message] [hop_limit]
34# udp_send sends a udp packet to an ipv6 address.
35
36
37def main():
38    args = sys.argv[1:]
39    assert len(args) == 4
40    destination_ipv6 = args[0]
41    destination_port = args[1]
42    message = bytes(args[2], 'utf-8')
43    hop_limit = int(args[3])
44    sock = socket.socket(
45        socket.AF_INET6,  # Internet
46        socket.SOCK_DGRAM)  # UDP
47
48    address = ipaddress.ip_address(destination_ipv6)
49    if address.is_multicast:
50        sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, hop_limit)
51    else:
52        sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_UNICAST_HOPS, hop_limit)
53    sock.sendto(message, (destination_ipv6, int(destination_port)))
54    sock.close()
55
56
57if __name__ == '__main__':
58    main()
59