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getpeername() on stdin using Python

+3 votes
155 views

I want to do getpeername() on stdin. I know I can do this by wrapping a socket object around stdin, with

s = socket.fromfd(sys.stdin.fileno(), family, type)

but that requires that I know what the family and type are. What I want to do is discover the family and type by looking at what getpeername() and/or getsockname() return. Can this be done with the standard library?

posted Oct 31, 2013 by Seema Siddique

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1 Answer

+2 votes

Try to use ctypes to access the underlying getpeername() function from libc.

answer Nov 1, 2013 by Majula Joshi
If it's possible to get this information with only the fd, then why does socket.fromfd require them?
Because socket.fromfd() is a very simplistic alternate way to create a  socket object, which meets a common use case that happens not to be my use case.
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+2 votes

The problem description:

There are set of processes running on my system say process_set_1. Build a process agent which runs an asynchronous socket listening to incoming requests from process_set_1. Each process sends an id. The agent stores these ids in a dictionary and sends response that ur id has been accepted. Now agent process receives some data from another process (which is some sort of sister process for the agent). This data contains id along with a command which is to be sent by the agent to the process_set_1 through HTTP client over AF_UNIX socket, since each process in process_set_1 has a HTTP listening CLI. The process agent sends an HTTP request by recognizing id stored in dictionary to the process_set_1. A service running in the process_set_1 routes this HTTP command to the respective process.

Now my problem is the HTTP request which to be sent must go through AF_UNIX socket. I got this solution.

class UnixStreamHTTPConnection(httplib.HTTPConnection):

    def __init__(self, path, host='localhost/rg_cli',port=None, strict=None,
                 timeout=None):
        httplib.HTTPConnection.__init__(self, host, port=port, strict=strict,
                                        timeout=timeout)
        self.path=path

    def connect(self):
        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        self.sock.connect(self.path)

But this cannot work since normal socket will not work and thus i thought of asyncore module in python. To use asyncore module again i will have to subclass asyncore.dispatcher. This class also contains connect() method.

Another problem is I don't know how asyncore module works and thus not able to find a way to mix the work of 1) listening forever, accept the connection, store id and the sock_fd.
2) accept data from the process' agent sister process, retrieve the sock_fd by matching the id in the dictionary and send it through the AF_UNIX socket.

Please help since i have already spent 2 days digging it out. Sorry if could explain my problem very well.

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