3

因此,我想扩展 Python smtpd SMTPServer 类,以便它可以处理 SMTP AUTH 连接。看起来很简单...

所以,看起来我可以这样开始:

def smtp_EHLO(self, arg):
    print 'got in arg: ', arg
    # do stuff here...

但由于某种原因,它永远不会被调用。Python smtpd 库调用其他类似的方法,如下所示:

        method = None
        i = line.find(' ')
        if i < 0:
            command = line.upper()
            arg = None
        else:
            command = line[:i].upper()
            arg = line[i+1:].strip()
        method = getattr(self, 'smtp_' + command, None)

为什么它不会调用我的方法?

在那之后,我认为我可能只是覆盖整个 found_terminator(self): 方法,但这似乎也不起作用。

 def found_terminator(self):
     # I add this to my child class and it never gets called... 

我是在做傻事还是……?也许我今天还没有完全醒来……

import smtpd
import asyncore

class CustomSMTPServer(smtpd.SMTPServer):

    def smtp_EHLO(self, arg):

        print 'got in arg: ', arg

    def process_message(self, peer, mailfrom, rcpttos, data):
        print 'Receiving message from:', peer
        print 'Message addressed from:', mailfrom
        print 'Message addressed to  :', rcpttos
        print 'Message length        :', len(data)
        print 'HERE WE ARE MAN!'
        return

    # Implementation of base class abstract method
    def found_terminator(self):
        print 'THIS GOT CALLED RIGHT HERE!'

        line = EMPTYSTRING.join(self.__line)
        print >> DEBUGSTREAM, 'Data:', repr(line)
        self.__line = []
        if self.__state == self.COMMAND:
            if not line:
                self.push('500 Error: bad syntax')
                return
            method = None
            i = line.find(' ')
            if i < 0:
                command = line.upper()
                arg = None
            else:
                command = line[:i].upper()
                arg = line[i+1:].strip()
            method = getattr(self, 'smtp_' + command, None)

            print 'looking for: ', command
            print 'method is: ', method

            if not method:
                self.push('502 Error: command "%s" not implemented' % command)
                return
            method(arg)
            return
        else:
            if self.__state != self.DATA:
                self.push('451 Internal confusion')
                return
            # Remove extraneous carriage returns and de-transparency according
            # to RFC 821, Section 4.5.2.
            data = []
            for text in line.split('\r\n'):
                if text and text[0] == '.':
                    data.append(text[1:])
                else:
                    data.append(text)
            self.__data = NEWLINE.join(data)
            status = self.__server.process_message(self.__peer,
                                                   self.__mailfrom,
                                                   self.__rcpttos,
                                                   self.__data)
            self.__rcpttos = []
            self.__mailfrom = None
            self.__state = self.COMMAND
            self.set_terminator('\r\n')
            if not status:
                self.push('250 Ok')
            else:
                self.push(status)

server = CustomSMTPServer(('127.0.0.1', 1025), None)

asyncore.loop()
4

2 回答 2

3

您需要扩展SMTPChannel——这就是smtp_实现动词方法的地方;您的扩展SMTPServer只需要返回您自己的频道子类。

于 2009-07-16T15:35:15.860 回答
1

TL&DR:要向 SMTPChannel 添加其他功能,您只需声明一个函数,然后将其直接添加到 smtpd.SMTPChannel

解释:

SMTPChannel 类旨在响应用户在开放端口(通常是端口 25)上输入的命令。它搜索可以回答的命令的方式是基于“自省”,它检查函数的所有可用属性。

请注意,SMTPChannel 中的函数需要以“smtp_”开头。例如,如果您想响应 HELP,您将创建 smtpd.SMTPChannel.smtp_HELP。

下面的函数来自详细说明自省的源代码

class SMTPChannel(asynchat.async_chat):
  method = getattr(self, 'smtp_' + command, None)

CodeThatWorks

第 1 步:声明一个将被调用的 FUNCTION

def smtp_HELP(self,arg):
  self.push("[8675309] GPT Answers to HELP")

第 2 步:将以下函数添加到 smtpd.SMTPChannel

class FakeSMTPServer(smtpd.SMTPServer):

"""A Fake smtp server"""
        smtpd.SMTPChannel.smtp_HELP = smtp_HELP

第 3 步:Telnet 到 localhost 25 并进行测试

Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 vics-imac.fios-router.home ESMTP Sendmail 6.7.4 Sunday 17 March 2019
HELP
[8675309] GPT Answers to HELP
于 2019-03-17T17:55:29.393 回答