在其他应用程序创建的现有套接字上查看套接字选项吗? [英] See socket options on existing sockets created by other apps?

问题描述

我想测试是否在现有套接字上设置了特定的套接字选项.即，几乎您可以在其中看到的所有内容:

I'd like to test whether particular socket options have been set on an existing socket. Ie, pretty much everything you can see in:

#!/usr/bin/env python
'''See possible TCP socket options'''

import socket

sockettypelist = [x for x in dir(socket) if x.startswith('SO_')]
sockettypelist.sort()
for sockettype in sockettypelist:
    print sockettype

任何人都知道如何看到现有套接字上的选项，即由其他进程创建的选项吗? las，我阅读的有关Python套接字编程的几乎所有文档都是关于制作新套接字的.

Anyone know how I can see the options on existing sockets, ie those created by other processes? Alas nearly all the documentation I read on Python socket programming is about making new sockets.

推荐答案

不幸的是，nailer的答案仅捕获了SOL_TCP级别的套接字选项，而没有捕获SOL_SOCKET级别的套接字选项(例如SO_KEEPALIVE).

Unfortunately, nailer's answer only catches the SOL_TCP level socket options and does not the SOL_SOCKET level ones (like SO_KEEPALIVE).

某些发行版将一些示例与systemtap一起提供.其中之一是pfiles.stp，可用于从正在运行的进程的套接字获取套接字选项.来自文件的示例:

Some of the distributions ships some examples together with systemtap. One of them is pfiles.stp that you can use to get the socket options from the sockets of a running process. Example from the file:

$ ./pfiles.stp `pgrep udevd`
   787: udevd
  Current rlimit: 32 file descriptors
   0: S_IFCHR mode:0666 dev:0,15 ino:396 uid:0 gid:0 rdev:1,3
      O_RDWR|O_LARGEFILE 
      /dev/null
   1: S_IFCHR mode:0666 dev:0,15 ino:396 uid:0 gid:0 rdev:1,3
      O_RDWR|O_LARGEFILE 
      /dev/null
   2: S_IFCHR mode:0666 dev:0,15 ino:396 uid:0 gid:0 rdev:1,3
      O_RDWR|O_LARGEFILE 
      /dev/null
   3: S_IFDIR mode:0600 dev:0,9 ino:1 uid:0 gid:0 rdev:0,0
      O_RDONLY 
      inotify
   4: S_IFSOCK mode:0777 dev:0,4 ino:2353 uid:0 gid:0 rdev:0,0
      O_RDWR 
      socket:[2353]
      SO_PASSCRED,SO_TYPE(2),SO_SNDBUF(111616),SO_RCVBUF(111616)
        sockname: AF_UNIX
   5: S_IFSOCK mode:0777 dev:0,4 ino:2354 uid:0 gid:0 rdev:0,0
      O_RDWR 
      socket:[2354]
      SO_TYPE(2),SO_SNDBUF(111616),SO_RCVBUF(33554432)
        ulocks: rcv
   6: S_IFIFO mode:0600 dev:0,6 ino:2355 uid:0 gid:0 rdev:0,0
      O_RDONLY|O_NONBLOCK 
      pipe:[2355]
   7: S_IFIFO mode:0600 dev:0,6 ino:2355 uid:0 gid:0 rdev:0,0
      O_WRONLY|O_NONBLOCK 
      pipe:[2355]

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