Showing content from http://mail.python.org/pipermail/python-dev/attachments/20090615/588e82e4/attachment-0001.py below:
# #Help on built-in function sendmsg: # #sendmsg(...) # sendmsg(data,[addr,[[(msg-level,msg-type,msg-data),...],[flags]]]) -> # sendlen # # Send data over a socket. You can additionally send ancilliary messages # over the socket by specifying them as a list (or any other iterable). # All other parameters are just as they are to sendto(). # # #Help on built-in function recvmsg: # #recvmsg(...) # recvmsg(len,[addr,[ancmsg,[flags]]]) -> # (data,[data,...],msg_flags) # # Receive data (and possible ancilliary messages) from the remote end # of this socket. Ancilliary messages are split into tuples, which are # then returned as a list. In case no message is available, returns an # empty list. Otherwise the function is similar to recv(). import socket import os import struct sp = socket.socketpair(socket.AF_UNIX, socket.SOCK_SEQPACKET) pid = os.fork() if pid == 0: ipc = sp[0] sp[1].close() print "[+] Child forked" fp = ipc.recvmsg(1)[1][0][0] print "[+] Child received the file descriptor, the contents:" print(fp.read(10000)) else: ipc = sp[1] sp[0].close() fp = open("/etc/passwd") print "[+] Parent forked child with pid", pid ret = ipc.sendmsg("x", None, [(socket.SOL_SOCKET, socket.SCM_RIGHTS, struct.pack("i", fp.fileno()))], 0) print "[+] Parent has sent the open file descriptor"
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