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Date:Mon Dec 10 20:45:41 1998 
Subject:Re: resolv.h and res_search 
From:Andrew Gabriel 
Volume-ID:981210.01 

In article <36698c44.926736@news.flash.net>,
	nospam@rocketmail.com (tim ishi) writes:
>Hi, I recently wrote a program that uses res_search() from the
><resolv.h> library to lookup the MX records for various domains.  The
>only documentation I could find for these <resolv.h> functions (man
>pages) neglect to explain how to interpret the results.  I wrote my
>own function that parses the buffer and extracts what I need, but it
>only works about 85% of the time because the assumptions I made about
>the return buffer, do not always hold true.  If anyone has used these
><resolv.h> functions before or knows about some resources that explain
>how to interpret the return buffer, that'd really help me out.

I vaguely recall them described in a book, I think
probably O'Reiley's DNS and BIND, but of course I
can't find my copy just now to check!

Also, check out the source of sendmail, which
regardless of any documentation, is pretty much
the definative user of res_search() for MX
lookups.

-- 
Andrew Gabriel
Consultant Software Engineer