72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
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#!/usr/bin/env python3
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import socket
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import io
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from werkzeug.serving import WSGIRequestHandler
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from typing import Iterator
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import logging
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logger = logging.getLogger(__name__)
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handler = logging.StreamHandler()
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handler.setFormatter(logging.Formatter('%(asctime)s:%(levelname)s\t%(message)s'))
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logger.addHandler(handler)
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logger.setLevel(logging.DEBUG)
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bEOT = b'\x04'
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class SwitchingRequestHandler(WSGIRequestHandler):
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def parse_request(self):
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if self.raw_requestline.startswith(b'[XWB]'):
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logger.info(f"{self.client_address[0]}:{self.client_address[1]} VistA OPEN")
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proxy_vista(read_from_file(self.rfile, self.raw_requestline), self.wfile, self.client_address, ('test.northport.med.va.gov', 19009))
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logger.info(f"{self.client_address[0]}:{self.client_address[1]} VistA CLOSE")
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return False
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return WSGIRequestHandler.parse_request(self)
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def proxy_vista(rfilegen: Iterator[bytes], wfile: io.BufferedWriter, localaddr: tuple, remoteaddr: tuple) -> None:
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remotesock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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remotesock.connect(remoteaddr)
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recipient = recv_from_socket(remotesock)
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for n, req in enumerate(rfilegen):
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logger.debug(f"{localaddr[0]}:{localaddr[1]} #{n} → {req.decode('latin-1').encode('unicode-escape').decode()}")
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remotesock.send(req + bEOT)
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res = next(recipient)
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for line in res.decode('latin-1').splitlines(keepends=True):
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logger.debug(f"{localaddr[0]}:{localaddr[1]} #{n} ← {line.encode('unicode-escape').decode()}")
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wfile.write(res + bEOT)
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remotesock.shutdown(socket.SHUT_RDWR)
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remotesock.close()
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def read_from_file(rfile: io.BufferedReader, buf: bytes=b'', end: bytes=bEOT, minsz: int=1024, maxsz: int=32768) -> Iterator[bytes]:
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if len(buf) > 0:
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while (idx := buf.find(end)) >= 0:
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if idx > 0:
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yield buf[:idx]
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buf = buf[idx + 1:]
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bufsz = minsz
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while len(data := rfile.read1(bufsz)) > 0:
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buf += data
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while (idx := buf.find(end)) >= 0:
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if idx > 0:
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yield buf[:idx]
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bufsz = minsz
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elif bufsz < maxsz:
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bufsz = _x if (_x := bufsz << 1) < maxsz else maxsz
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buf = buf[idx + 1:]
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def recv_from_socket(sock: socket.socket, end: bytes=bEOT, minsz: int=1024, maxsz: int=32768) -> Iterator[bytes]:
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buf = b''
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bufsz = minsz
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while True:
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if len(data := sock.recv(bufsz)) > 0:
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buf += data
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while (idx := buf.find(end)) >= 0:
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if idx > 0:
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yield buf[:idx]
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bufsz = minsz
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elif bufsz < maxsz:
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bufsz = _x if (_x := bufsz << 1) < maxsz else maxsz
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buf = buf[idx + 1:]
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