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36 lines
991 B
Python
36 lines
991 B
Python
#!/usr/bin/env python3
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import argparse
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import socket
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import sys
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def main() -> int:
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p = argparse.ArgumentParser(
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description="IPv6 UDP server bound to a specific local address"
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)
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p.add_argument(
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"--bind", required=True, help="Local IPv6 address to bind to, e.g. fde0:..."
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)
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p.add_argument("--port", type=int, default=45679, help="UDP port to listen on")
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p.add_argument("--reply", default="ok", help="Reply prefix")
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args = p.parse_args()
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s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
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s.bind((args.bind, args.port, 0, 0))
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print(f"listening on [{args.bind}]:{args.port}")
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print(f"sockname={s.getsockname()}")
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data, peer = s.recvfrom(65535)
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print(f"from={peer} data={data!r}")
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out = args.reply.encode() + b":" + data
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s.sendto(out, peer)
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print(f"sent={out!r} to={peer}")
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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