anti
8335c5dc4c
Every service's _log() called print() then write_syslog_file() which also calls print(), causing every log line to appear twice in Docker logs. The collector streamed both copies, doubling ingested events. Removed the redundant print() from all 22 service server.py files.
81 lines
2.3 KiB
Python
81 lines
2.3 KiB
Python
#!/usr/bin/env python3
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"""
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TFTP server (UDP 69).
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Parses RRQ (read) and WRQ (write) requests, logs filename and transfer mode,
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then responds with an error packet. Logs all requests as JSON.
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"""
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import asyncio
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import os
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import struct
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from decnet_logging import syslog_line, write_syslog_file, forward_syslog
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NODE_NAME = os.environ.get("NODE_NAME", "tftpserver")
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SERVICE_NAME = "tftp"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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# TFTP opcodes
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_RRQ = 1
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_WRQ = 2
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_ERROR = 5
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# TFTP Error packet: opcode(2) + error_code(2) + error_msg + NUL
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def _error_pkt(code: int, msg: str) -> bytes:
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return struct.pack(">HH", _ERROR, code) + msg.encode() + b"\x00"
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def _log(event_type: str, severity: int = 6, **kwargs) -> None:
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line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
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write_syslog_file(line)
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forward_syslog(line, LOG_TARGET)
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class TFTPProtocol(asyncio.DatagramProtocol):
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def __init__(self):
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self._transport = None
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def connection_made(self, transport):
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self._transport = transport
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def datagram_received(self, data: bytes, addr):
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if len(data) < 4:
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return
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opcode = struct.unpack(">H", data[:2])[0]
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if opcode in (_RRQ, _WRQ):
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# Filename and mode are NUL-terminated strings after the opcode
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parts = data[2:].split(b"\x00")
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filename = parts[0].decode(errors="replace") if parts else ""
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mode = parts[1].decode(errors="replace") if len(parts) > 1 else ""
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_log(
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"request",
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src=addr[0],
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src_port=addr[1],
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op="RRQ" if opcode == _RRQ else "WRQ",
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filename=filename,
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mode=mode,
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)
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self._transport.sendto(_error_pkt(2, "Access violation"), addr)
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else:
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_log("unknown_opcode", src=addr[0], opcode=opcode, data=data[:32].hex())
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def error_received(self, exc):
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pass
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async def main():
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_log("startup", msg=f"TFTP server starting as {NODE_NAME}")
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loop = asyncio.get_running_loop()
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transport, _ = await loop.create_datagram_endpoint(
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TFTPProtocol, local_addr=("0.0.0.0", 69) # nosec B104
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)
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try:
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await asyncio.sleep(float("inf"))
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finally:
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transport.close()
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if __name__ == "__main__":
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asyncio.run(main())
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