Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!news.tele.dk!feed118.news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.003 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'say,': 0.05; 'subject:same': 0.07; 'get.': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'tcp/ip': 0.09; 'type;': 0.09; 'url:localhost': 0.09; 'subject:How': 0.10; 'python': 0.11; 'wrote': 0.14; 'finney': 0.16; 'invoking': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'second-guess': 0.16; 'supplied': 0.16; 'unix,': 0.16; 'written': 0.21; '(in': 0.22; 'header:User-Agent:1': 0.23; "shouldn't": 0.24; 'header:X-Complaints-To:1': 0.27; 'appear': 0.29; 'host': 0.29; 'unix': 0.29; 'network.': 0.30; 'asked': 0.31; 'url:wiki': 0.31; 'facility': 0.31; 'url:wikipedia': 0.31; 'wright': 0.31; 'writes:': 0.31; 'allows': 0.31; 'subject:the': 0.34; 'could': 0.34; "can't": 0.35; 'connection': 0.35; 'but': 0.35; 'accessing': 0.36; "i'll": 0.36; 'url:org': 0.36; 'should': 0.36; 'application': 0.37; 'implement': 0.38; 'server': 0.38; 'ben': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'how': 0.40; 'read': 0.60; 'is.': 0.60; 'radio': 0.60; 'skip:\xe2 10': 0.65; 'within': 0.65; 'determine': 0.67; 'started.': 0.68; 'listening': 0.74; 'music': 0.75; '8bit%:46': 0.78; 'connection,': 0.95 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Ben Finney Subject: Re: How to determine whether client and server are on the same host Date: Tue, 26 Nov 2013 10:41:44 +1100 References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Gmane-NNTP-Posting-Host: rasputin.madmonks.org X-Public-Key-ID: 0xAC128405 X-Public-Key-Fingerprint: 517C F14B B2F3 98B0 CB35 4855 B8B2 4C06 AC12 8405 X-Public-Key-URL: http://www.benfinney.id.au/contact/bfinney-gpg.asc X-Post-From: Ben Finney User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux) Cancel-Lock: sha1:xspvZe/OY2YMV5oPSQivZPmuFzY= X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 29 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1385422916 news.xs4all.nl 15939 [2001:888:2000:d::a6]:49787 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:60469 Malte Forkel writes: > I have a Python application that communicates with a server via > telnet. Host and port of the server are supplied by the user when the > application is started. > > How can I determine from within the application whether the server's > host actually is the local host? (In that case I could implement an > operation not available in the telnet-based protocol by directly > accessing the local filesystem.) On Unix, this is up to the person invoking the program: the “sockets facility allows for a host-local connection to appear as though it's going over a network. In other words: Your program shouldn't go snooping around to second-guess the connection type; if the user asked for a TCP/IP connection, that's what they should get. If they want to take advantage of a local connection, they can use a Unix domain socket. -- \ “I wrote a song, but I can't read music so I don't know what it | `\ is. Every once in a while I'll be listening to the radio and I | _o__) say, ‘I think I might have written that.’” —Steven Wright | Ben Finney