298 lines
11 KiB
Python
298 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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import socket
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import threading
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import time
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import sys
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# Configuration
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TARGET_HOST = "zentao.sunyard.com.cn"
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TARGET_PORT = 9788
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B_HOST = "localhost"
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B_PORT = 8080
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# Global lock for socket write operations
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socket_write_lock = threading.Lock()
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def get_thread_id():
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"""Get thread identifier for logging"""
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return threading.current_thread().getName()
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def log_info(source, message):
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"""Log info message with thread ID"""
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thread_id = get_thread_id()
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log_line = "[%s] [INFO] [%s] [Thread:%s] %s" % (
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time.strftime("%Y-%m-%d %H:%M:%S"),
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source,
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thread_id,
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message
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)
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print(log_line)
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sys.stdout.flush()
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def log_error(source, message):
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"""Log error message with thread ID"""
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thread_id = get_thread_id()
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log_line = "[%s] [ERROR] [%s] [Thread:%s] %s" % (
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time.strftime("%Y-%m-%d %H:%M:%S"),
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source,
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thread_id,
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message
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)
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print(log_line)
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sys.stdout.flush()
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def extract_request_id(request_data):
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"""Extract X-Proxy-Request-ID from request headers"""
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if "\r\n\r\n" in request_data:
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headers_end = request_data.find("\r\n\r\n")
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headers = request_data[:headers_end]
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for line in headers.split("\r\n"):
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if line.lower().startswith("x-proxy-request-id:"):
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return line.split(":", 1)[1].strip()
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return None
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def modify_request_headers(request_data):
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"""Modify request headers: replace Origin, Referer, Host; remove Connection headers"""
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lines = request_data.split("\r\n")
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new_lines = []
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method = ""
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path = ""
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if lines:
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first_line = lines[0]
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parts = first_line.split()
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if len(parts) >= 2:
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method = parts[0]
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path = parts[1]
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for line in lines:
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line_str = line
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if line_str.startswith("Origin:"):
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new_lines.append("Origin: http://%s:%d" % (TARGET_HOST, TARGET_PORT))
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elif line_str.startswith("Referer:"):
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new_lines.append("Referer: http://%s:%d/" % (TARGET_HOST, TARGET_PORT))
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elif line_str.startswith("Host:"):
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new_lines.append("Host: %s:%d" % (TARGET_HOST, TARGET_PORT))
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elif line_str.lower().startswith("connection:"):
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continue
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elif line_str.lower().startswith("keep-alive:"):
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continue
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elif line_str.lower().startswith("proxy-connection:"):
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continue
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elif line_str.lower().startswith("x-forwarded-for:"):
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continue
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elif line_str.lower().startswith("x-proxy-request-id:"):
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continue
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else:
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new_lines.append(line_str)
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modified_data = "\r\n".join(new_lines)
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if path.startswith("/"):
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new_path = "http://%s:%d%s" % (TARGET_HOST, TARGET_PORT, path)
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if method and modified_data:
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modified_data = modified_data.replace(path, new_path, 1)
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return modified_data, method, path
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def handle_request(request_data):
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"""Handle a single request from device B - completely independent thread"""
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if isinstance(request_data, bytes):
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request_data_str = request_data.decode('utf-8')
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else:
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request_data_str = request_data
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request_id = extract_request_id(request_data_str)
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modified_data, method, path = modify_request_headers(request_data_str)
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body_size = 0
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if "\r\n\r\n" in modified_data:
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body_size = len(modified_data) - modified_data.find("\r\n\r\n") - 4
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log_info("System", "Request: %s %s - Body: %d bytes - ID: %s" % (method, path, body_size, request_id))
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target_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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target_sock.settimeout(30)
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try:
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target_sock.connect((TARGET_HOST, TARGET_PORT))
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log_info("System", "Connected to target: %s:%d" % (TARGET_HOST, TARGET_PORT))
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if isinstance(modified_data, str):
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modified_data = modified_data.encode('utf-8')
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target_sock.sendall(modified_data)
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response = b""
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content_length = 0
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is_chunked = False
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while True:
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chunk = target_sock.recv(8192)
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if not chunk:
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break
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response += chunk
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if b"\r\n\r\n" in response and content_length == 0 and not is_chunked:
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headers_end = response.find(b"\r\n\r\n")
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headers = response[:headers_end].decode('utf-8')
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for line in headers.split("\r\n"):
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if line.lower().startswith("content-length:"):
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content_length = int(line.split(":", 1)[1].strip())
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elif line.lower().startswith("transfer-encoding:"):
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if "chunked" in line.lower():
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is_chunked = True
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if content_length > 0:
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body_start = headers_end + 4
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if len(response) - body_start >= content_length:
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break
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elif is_chunked:
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if response.endswith(b"0\r\n\r\n"):
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break
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if request_id:
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if b"\r\n\r\n" in response:
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headers_end = response.find(b"\r\n\r\n")
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headers = response[:headers_end]
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body = response[headers_end:]
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response = headers + ("\r\nX-Proxy-Request-ID: " + request_id).encode('utf-8') + body
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status_code = "500"
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if b"\r\n\r\n" in response:
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headers_end = response.find(b"\r\n\r\n")
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headers = response[:headers_end].decode('utf-8')
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for line in headers.split("\r\n"):
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if line.startswith("HTTP/"):
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status_code = line.split()[1]
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break
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log_info("System", "Response: %s %s - Status: %s - ID: %s" % (method, path, status_code, request_id))
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return response
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except socket.error as e:
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if e.errno == 111 or e.errno == 10061:
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log_error("System", "Cannot connect to target: %s:%d" % (TARGET_HOST, TARGET_PORT))
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error_response = ("HTTP/1.1 502 Bad Gateway\r\nX-Proxy-Request-ID: " + (request_id if request_id else "") + "\r\nContent-Type: text/plain\r\n\r\nCannot connect to target: %s:%d\r\n" % (TARGET_HOST, TARGET_PORT)).encode('utf-8')
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return error_response
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else:
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log_error("System", "Socket error: %s" % str(e))
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error_response = ("HTTP/1.1 502 Bad Gateway\r\nX-Proxy-Request-ID: " + (request_id if request_id else "") + "\r\nContent-Type: text/plain\r\n\r\nSocket error\r\n").encode('utf-8')
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return error_response
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except socket.timeout:
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log_error("System", "Target connection timeout")
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error_response = ("HTTP/1.1 504 Gateway Timeout\r\nX-Proxy-Request-ID: " + (request_id if request_id else "") + "\r\nContent-Type: text/plain\r\n\r\nConnection timeout\r\n").encode('utf-8')
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return error_response
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except Exception as e:
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log_error("System", "Error handling request: %s" % str(e))
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error_response = ("HTTP/1.1 500 Internal Server Error\r\nX-Proxy-Request-ID: " + (request_id if request_id else "") + "\r\nContent-Type: text/plain\r\n\r\nInternal error\r\n").encode('utf-8')
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return error_response
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finally:
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target_sock.close()
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def process_request(b_socket, request_data):
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"""Process a request in separate thread and send response back"""
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response = handle_request(request_data)
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with socket_write_lock:
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try:
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log_info("System", "Sending response back to B, length: %d bytes" % len(response))
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b_socket.sendall(response)
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log_info("System", "Response sent successfully")
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except Exception as e:
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log_error("System", "Failed to send response: %s" % str(e))
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def listen_for_requests(sock):
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"""Listen for requests from device B"""
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sock.settimeout(300)
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while True:
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try:
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data = b""
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while True:
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chunk = sock.recv(8192)
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if not chunk:
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log_info("System", "Connection closed by device B")
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return
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data += chunk
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if b"\r\n\r\n" in data:
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headers_end = data.find(b"\r\n\r\n")
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headers = data[:headers_end].decode('utf-8')
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content_length = 0
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for line in headers.split("\r\n"):
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if line.lower().startswith("content-length:"):
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content_length = int(line.split(":", 1)[1].strip())
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break
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body_start = headers_end + 4
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if len(data) - body_start >= content_length:
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break
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t = threading.Thread(target=process_request, args=(sock, data), name="ReqHandler-%d" % threading.activeCount())
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t.daemon = True
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t.start()
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except socket.timeout:
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log_info("System", "Connection idle timeout, continuing to wait")
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continue
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except Exception as e:
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log_error("System", "Connection error: %s" % str(e))
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return
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def connect_to_b_device(b_host, b_port):
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"""Connect to device B and handle requests"""
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while True:
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.settimeout(10)
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log_info("System", "Connecting to device B: %s:%d" % (b_host, b_port))
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sock.connect((b_host, b_port))
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log_info("System", "Connected to device B, waiting for PROXY_CONNECTED")
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response = sock.recv(1024)
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log_info("System", "Received from B: %r" % response)
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if not response or b"PROXY_CONNECTED" not in response:
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log_error("System", "Failed to receive connection confirmation")
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sock.close()
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time.sleep(3)
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continue
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log_info("System", "Sending READY to device B")
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sock.sendall(b"READY\r\n")
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log_info("System", "Successfully connected to device B: %s:%d" % (b_host, b_port))
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listen_for_requests(sock)
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except socket.error as e:
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if e.errno == 111 or e.errno == 10061:
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log_info("System", "Device B not ready (%s:%d), retrying in 3 seconds..." % (b_host, b_port))
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else:
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log_error("System", "Connection error: %s" % str(e))
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time.sleep(3)
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except Exception as e:
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log_error("System", "Unexpected error: %s" % str(e))
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time.sleep(3)
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def main():
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print("=" * 60)
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print(" Proxy Client (Run on Computer A)")
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print("=" * 60)
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print("Target website:", TARGET_HOST, ":", TARGET_PORT)
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print("Device B address:", B_HOST, ":", B_PORT)
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print("=" * 60)
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sys.stdout.flush()
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try:
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connect_to_b_device(B_HOST, B_PORT)
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except KeyboardInterrupt:
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print("\nShutting down...")
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sys.exit(0)
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if __name__ == "__main__":
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main()
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