Python代码实现http/https代理服务器的脚本

            
#!/usr/bin/python
#-*- coding:utf-8 -*-
import socket, logging
import select, errno
import os
import sys
import traceback
import gzip
from StringIO import StringIO
import Queue
import threading
import time
import thread
import cgi
from cgi import parse_qs
import json
import imp
from os.path import join, getsize
import re
import ssl
##################user config ##################
logger = logging.getLogger("network-server")
#############################################
def getTraceStackMsg():
 tb = sys.exc_info()[2]
 msg = ''
 for i in traceback.format_tb(tb):
  msg += i
 return msg
def InitLog():
 logger.setLevel(logging.DEBUG)
 fh = logging.FileHandler("network-server.log")
 fh.setLevel(logging.DEBUG)
 ch = logging.StreamHandler()
 ch.setLevel(logging.ERROR)
 formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
 ch.setFormatter(formatter)
 fh.setFormatter(formatter)
 logger.addHandler(fh)
 logger.addHandler(ch)
def clearfdpro(epoll_fd, params, fd):
 try:
  fd_check = int(fd)
 except Exception, e:
  print "fd error"
  sys.exit(1)
 try:
  #print "pid:%s, close fd:%s" % (os.getpid(), fd)
  epoll_fd.unregister(fd)
 except Exception, e:
  #print str(e)+getTraceStackMsg()
  pass
 try:
  param = params[fd]
  try:
   addr = param["addr"]
   if "next" in param:
    print "close sock, %s:%s" % (addr[0], addr[1])
  except Exception, e:
   pass
  param["connections"].shutdown(socket.SHUT_RDWR)
  param["connections"].close()
  f = param.get("f", None)
  if f != None:
   f.close()
  rc = param.get("rc", None)
  if rc != None:
   rc.close()
  if "read_cache_name" in param:
   os.remove(param["read_cache_name"])
 except Exception, e:
  #print str(e)+getTraceStackMsg()
  pass
 try:
  del params[fd]
  #logger.error(getTraceStackMsg())
  #logger.error("clear fd:%s" % fd)
 except Exception, e:
  #print str(e)+getTraceStackMsg()
  pass
def clearfd(epoll_fd, params, fd):
 try:
  param = params[fd]
  if "nextfd" in param:
   nextfd = param["nextfd"]
   next_param = params[nextfd]
   del param["nextfd"]
   del next_param["nextfd"]
   if not "next" in param: #masterfd
    clearfdpro(epoll_fd, params, nextfd)
   else: # nextfd
    if not "writedata" in next_param or len(next_param["writedata"]) == 0:
     clearfdpro(epoll_fd, params, nextfd)
    else:
     next_param["sendandclose"] = "true"
  clearfdpro(epoll_fd, params, fd)
 except Exception, e:
  #print str(e)+getTraceStackMsg()
  pass
def FindHostPort(datas):
 host_s = -1
 host_e = -1
 host_str = None
 host = ""
 port = ""
 if not datas.startswith("CONNECT"):
  host_s = datas.find("Host:")
  if host_s < 0:
   host_s = datas.find("host:")
  if host_s > 0:
   host_e = datas.find("\r\n", host_s)
  if host_s > 0 and host_e > 0:
   host_str = datas[host_s+5:host_e].strip()
   add_list = host_str.split(":")
   if len(add_list) == 2:
    host = add_list[0]
    port = add_list[1]
   else:
    host = add_list[0]
    port = 80
   first_seg = datas.find("\r\n")
   first_line = datas[0:first_seg]
   first_line = first_line.replace(" http://%s" % host_str, " ")
   datas = first_line + datas[first_seg:]
 else:
  first_seg = datas.find("\r\n")
  head_e = datas.find("\r\n\r\n")
  if first_seg > 0 and head_e > 0:
   first_line = datas[0:first_seg]
36a0
   com,host_str,http_version = re.split('\s+', first_line)
   add_list = host_str.split(":")
   if len(add_list) == 2:
    host = add_list[0]
    port = add_list[1]
   else:
    host = add_list[0]
    port = 443
   host_s = 1
   host_e = 1
 return host_str,host_s,host_e,host,port,datas
def connect_pro(params, param, epoll_fd, datas, fd, cur_time, host, port):
 try:
  nextfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
  nextfd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  nextfd.settimeout(5)
  try:
   nextfd.connect((host, int(port)))
  except Exception, e:
   print "########%s,%s connect fail" % (host,port)
  nextfd.setblocking(0)
  next_fileno = nextfd.fileno()
  print "pid:%s, connect %s:%s fd:%s" % (os.getpid(), host, port, next_fileno)
  if next_fileno in params:
   print "fileno exist"
   sys.exit(1)
  if not datas.startswith("CONNECT"):
   next_param = {"addr":[host,port],"writelen":0, "connections":nextfd, "time":cur_time, "nextfd":fd}
   param["nextfd"] = next_fileno
   next_param["writedata"] = datas
   next_param["writelen"] = 0
   next_param["next"] = "true"
   param["read_len"] = 0
   param["readdata"] = ""
   params[next_fileno] = next_param
   epoll_fd.register(next_fileno, select.EPOLLIN | select.EPOLLOUT | select.EPOLLERR | select.EPOLLHUP)
   epoll_fd.modify(fd, select.EPOLLIN | select.EPOLLERR | select.EPOLLHUP)
  else:
   next_param = {"addr":[host,port],"writelen":0, "connections":nextfd, "time":cur_time, "nextfd":fd}
   param["nextfd"] = next_fileno
   next_param["next"] = "true"
   params[next_fileno] = next_param
   epoll_fd.register(next_fileno, select.EPOLLIN | select.EPOLLERR | select.EPOLLHUP)
   param["read_len"] = 0
   param["readdata"] = ""
   param["writedata"] = "HTTP/1.1 200 Connection Established\r\nConnection: close\r\n\r\n"
   param["writelen"] = 0
   param["reuse"] = "true"
   epoll_fd.modify(fd, select.EPOLLIN | select.EPOLLOUT | select.EPOLLERR | select.EPOLLHUP)
 except socket.error, msg:
  clearfd(epoll_fd,params,fd)
def process_datas(process_status, params, param, epoll_fd, datas, read_len, fd, cur_time):
 if process_status == "close":
  clearfd(epoll_fd,params,fd)
 else:
  need_connect = False
  host_str = None
  host_s = -1
  host_e = -1
  if "reuse" in param and "next" not in param:
   if not datas.startswith("CONNECT") and \
     not datas.startswith("GET") and \
     not datas.startswith("POST") and \
     not datas.startswith("PUT"):
    del param["reuse"]
   else:
    host_str,host_s,host_e,host,port,datas = FindHostPort(datas)
    host_s = int(host_s)
    host_e = int(host_e)
    next_fileno = param["nextfd"]
    next_param = params[next_fileno]
    addr = next_param["addr"]
    if host_s > 0 and host_e > 0:
     if host != addr[0] or str(port) != str(addr[1]):
      print "%s,%s neq %s,%s" % (host,port,addr[0],addr[1])
      need_connect = True
      del param["nextfd"]
      del next_param["nextfd"]
      clearfd(epoll_fd,params,next_fileno)
     del param["reuse"]
    else:
     param["read_len"] = read_len
     param["readdata"] = datas
     return None
  if need_connect or not "nextfd" in param:
   if host_str == None or not host_s > 0 or not host_e > 0:
    host_str,host_s,host_e,host,port,datas = FindHostPort(datas)
    host_s = int(host_s)
    host_e = int(host_e)
   if host_s > 0 and host_e > 0:
    if not datas.startswith("CONNECT"):
     epoll_fd.modify(fd, select.EPOLLERR | select.EPOLLHUP) # 简单处理，http连接时把读去掉，避免内存攻击
    thread.start_new_thread(connect_pro,(params, param, epoll_fd, datas, fd, cur_time, host, port))
   else:
    param["read_len"] = read_len
    param["readdata"] = datas
  else:
   next_fileno = param["nextfd"]
   next_param = params[next_fileno]
   if "next" in param:
    next_param["reuse"] = "true"
   write_data = next_param.get("writedata", "")
   write_data += datas
   next_param["writedata"] = write_data
   param["read_len"] = 0
   param["readdata"] = ""
   epoll_fd.modify(next_fileno, select.EPOLLIN | select.EPOLLOUT | select.EPOLLERR | select.EPOLLHUP)
  if process_status == "close_after_process":
   print "close after process"
   clearfd(epoll_fd,params,fd)
def run_main(listen_fd):
 try:
  epoll_fd = select.epoll()
  epoll_fd.register(listen_fd.fileno(), select.EPOLLIN | select.EPOLLERR | select.EPOLLHUP)
  print "listen_fd:%s" % listen_fd.fileno()
 except select.error, msg:
  logger.error(msg)
 params = {}
 last_min_time = -1
 while True:
  epoll_list = epoll_fd.poll()
  cur_time = time.time()
  for fd, events in epoll_list:
   if fd == listen_fd.fileno():
    while True:
     try:
      conn, addr = listen_fd.accept()
      conn.setblocking(0)
      epoll_fd.register(conn.fileno(), select.EPOLLIN | select.EPOLLERR | select.EPOLLHUP)
      conn.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
      #conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
      params[conn.fileno()] = {"addr":addr,"writelen":0, "connections":conn, "time":cur_time}
     except socket.error, msg:
      break
   elif select.EPOLLIN & events:
    param = params.get(fd,None)
    if param == None:
     continue
    param["time"] = cur_time
    datas = param.get("readdata","")
    cur_sock = params[fd]["connections"]
    read_len = param.get("read_len", 0)
    process_status = "close"
    while True:
     try:
      data = cur_sock.recv(102400)
      if not data:
       if datas == "":
        break
       else:
        raise Exception("close after process")
      else:
       datas += data
       read_len += len(data)
     except socket.error, msg:
      if msg.errno == errno.EAGAIN:
       process_status = "process"
       break
      else:
       break
     except Exception, e:
      process_status = "close_after_process"
      break
    process_datas(process_status, params, param, epoll_fd, datas, read_len, fd, cur_time)
   elif select.EPOLLHUP & events or select.EPOLLERR & events:
    clearfd(epoll_fd,params,fd)
    logger.error("sock: %s error" % fd)
   elif select.EPOLLOUT & events:
    param = params.get(fd,None)
    if param == None:
     continue
    param["time"] = cur_time
    sendLen = param.get("writelen",0)
    writedata = param.get("writedata", "")
    total_write_len = len(writedata)
    cur_sock = param["connections"]
    f = param.get("f", None)
    totalsenlen = param.get("totalsenlen", None)
    if writedata == "":
     clearfd(epoll_fd,params,fd)
     continue
    while True:
     try:
      sendLen += cur_sock.send(writedata[sendLen:])
      if sendLen == total_write_len:
       if f != None and totalsenlen != None:
        readmorelen = 102400
        if readmorelen > totalsenlen:
         readmorelen = totalsenlen
        morefiledata = ""
        if readmorelen > 0:
         morefiledata = f.read(readmorelen)
        if morefiledata != "":
         writedata = morefiledata
         sendLen = 0
         total_write_len = len(writedata)
         totalsenlen -= total_write_len
         param["writedata"] = writedata
         param["totalsenlen"] = totalsenlen
         continue
        else:
         f.close()
         del param["f"]
         del param["totalsenlen"]
       if not "sendandclose" in param:
        param["writedata"] = ""
        param["writelen"] = 0
        epoll_fd.modify(fd, select.EPOLLIN | select.EPOLLERR | select.EPOLLHUP)
       else:
        clearfd(epoll_fd,params,fd)
       break
     except socket.error, msg:
      if msg.errno == errno.EAGAIN:
       param["writelen"] = sendLen
       break
      clearfd(epoll_fd,params,fd)
      break
   else:
    continue
  #check time out
  if cur_time - last_min_time > 20:
   last_min_time = cur_time
   objs = params.items()
   for (key_fd,value) in objs:
    fd_time = value.get("time", 0)
    del_time = cur_time - fd_time
    if del_time > 20:
     clearfd(epoll_fd,params,key_fd)
    elif fd_time < last_min_time:
     last_min_time = fd_time
if __name__ == "__main__":
 reload(sys)
 sys.setdefaultencoding('utf8')
 InitLog()
 port = int(sys.argv[1])
 try:
  listen_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
 except socket.error, msg:
  logger.error("create socket failed")
 try:
  listen_fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 except socket.error, msg:
  logger.error("setsocketopt SO_REUSEADDR failed")
 try:
  listen_fd.bind(('', port))
 except socket.error, msg:
  logger.error("bind failed")
 try:
  listen_fd.listen(10240)
  listen_fd.setblocking(0)
 except socket.error, msg:
  logger.error(msg)
 child_num = 19
 c = 0
 while c < child_num:
  c = c + 1
  newpid = os.fork()
  if newpid == 0:
   run_main(listen_fd)
 run_main(listen_fd)