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Groups > comp.lang.python > #33404
| From | Nobody <nobody@nowhere.com> |
|---|---|
| Subject | Re: Subprocess puzzle and two questions |
| Date | 2012-11-15 22:54 +0000 |
| Message-Id | <pan.2012.11.15.22.54.09.449000@nowhere.com> |
| Newsgroups | comp.lang.python |
| References | (2 earlier) <roy-F5C640.09225714112012@news.panix.com> <mailman.3684.1352904008.27098.python-list@python.org> <k80gd6$t0q$1@panix2.panix.com> <mailman.3700.1352930072.27098.python-list@python.org> <roy-BF8F05.20491814112012@news.panix.com> |
| Organization | Zen Internet |
On Wed, 14 Nov 2012 20:49:19 -0500, Roy Smith wrote: >> I'm slightly surprised that there's no way with the Python stdlib to >> point a DNS query at a specific server > > Me too, including the "only slightly" part. The normal high-level C > resolver routines (getaddrinfo/getnameinfo, or even the old > gethostbyname series), don't expose any way to do that. That's because the high-level routines aren't tied to DNS. gethostbyname() and getaddrinfo() use the NSS (name-service switch) mechanism, which is configured via /etc/nsswitch.conf. Depending upon configuration, hostnames can be looked up via a plain text file (/etc/hosts), Berkeley DB files, DNS, NIS, NIS+, LDAP, WINS, etc. DNS is just one particular back-end, which may or may not be used on any given system. If you specifically want to perform DNS queries, you have to use a DNS-specific interface (e.g. the res_* functions described in the resolver(3) manpage), or raw sockets, rather than a high-level interface such as gethostbyname() or getaddrinfo().
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Subprocess puzzle and two questions wrw@mac.com - 2012-11-13 22:34 -0500
Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-13 23:41 -0500
Re: Subprocess puzzle and two questions William Ray Wing <wrw@mac.com> - 2012-11-14 00:03 -0500
Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 09:22 -0500
Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 01:40 +1100
Re: Subprocess puzzle and two questions roy@panix.com (Roy Smith) - 2012-11-14 11:20 -0500
Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 08:54 +1100
Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 20:49 -0500
Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 13:04 +1100
Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-14 21:10 -0500
Re: Subprocess puzzle and two questions Chris Angelico <rosuav@gmail.com> - 2012-11-15 13:21 +1100
Re: Subprocess puzzle and two questions Dave Angel <d@davea.name> - 2012-11-14 21:55 -0500
Re: Subprocess puzzle and two questions Kushal Kumaran <kushal.kumaran+python@gmail.com> - 2012-11-15 10:23 +0530
Re: Subprocess puzzle and two questions Nobody <nobody@nowhere.com> - 2012-11-15 22:54 +0000
Re: Subprocess puzzle and two questions Roy Smith <roy@panix.com> - 2012-11-15 20:07 -0500
Re: Subprocess puzzle and two questions Nobody <nobody@nowhere.com> - 2012-11-17 00:17 +0000
DNS from Python (was Re: Subprocess puzzle and two questions) aahz@pythoncraft.com (Aahz) - 2012-11-14 21:42 -0800
Re: Subprocess puzzle and two questions wrw@mac.com - 2012-11-14 09:37 -0500
Re: Subprocess puzzle and two questions Tim Roberts <timr@probo.com> - 2012-11-13 23:17 -0800
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