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Date: Wed, 15 Dec 93 09:08:10 +0000 (GMT)
From: "Nigel Metheringham" <nigelm@ohm.york.ac.uk>
To: Gregory Neil Shapiro <gshapiro@WPI.EDU>
Subject: Re: sendmail 8 and name resolution 
Cc: Paul A Vixie <paul@vix.com>, bind-workers@vix.com, aej@WPI.EDU

} [on compilation of things linked with bind 4.9.2 libresolv]
} I tried to do this but ran into problems.  When compiling sendmail
} using libresolv.a from the BIND 4.9.2, the compilation fails since
} things are multiply defined:
} 

} [compilation]
} ld:
} /lib/libc.a(gethostent.o): sethostent: multiply defined
} /lib/libc.a(gethostent.o): endhostent: multiply defined
} /lib/libc.a(gethostent.o): gethostbyname: multiply defined
} /lib/libc.a(gethostent.o): gethostbyaddr: multiply defined
} *** Error code 1
} 


This must be a bug in the MIPs compiler set - we see very much the  
same problem on a MIPs system running 4.52.  I put in a bug report  
about this a couple of years back (slightly different version of the  
OS, but same symptoms).  Its relatively complex in that you cannot  
reproduce it in a small file (well I can't!).

My hack to get round it was to make a new libresolv.a (actually for  
me its libresolv2.a) with the following defines on the cc command  
line
	-Dgethostbyname=Gethostbyname
	-Dgethostbyaddr=Gethostbyaddr
and compile sendmail (or other package with same problems) with the  
same defines.  Its messy but it works.

[To complicate matters some programs of similar complexity and  
network functionality to sendmail do suffer from this problem when  
compiling, and some don't!]

	Nigel.
---
#   Nigel Metheringham  -- (NeXT) EMail: nigelm@ohm.york.ac.uk    #
#   System Administrator, Electronics Dept, University of York    #
#   York YO1 5DD. Phone: +44 904 432374, Fax: +44 904 432335      #

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From: Gregory Neil Shapiro <gshapiro@WPI.EDU>
Received: from localhost (gshapiro@localhost) by monkeyboy.WPI.EDU (8.6.5.Beta3/8.6) id JAA05398; Wed, 15 Dec 1993 09:28:49 -0500
Date: Wed, 15 Dec 1993 09:28:49 -0500
Message-Id: <199312151428.JAA05398@monkeyboy.WPI.EDU>
To: Paul A Vixie <paul@vix.com>
Cc: aej@WPI.EDU, bind-workers@vix.com
Subject: Re: sendmail 8 and name resolution 
In-Reply-To: <m0p9sDK-000E9cC@rioja.ohm.york.ac.uk>
References: <m0p9sDK-000E9cC@rioja.ohm.york.ac.uk>

We think we have figured out what local_hostname_length does by trying it
with different inputs.  We can't be sure this is its only purpose.  It
seems to return the length of a local (in domain) hostname (without domain)
if the hostname has the domain name appended.  For example, our domain name
is WPI.EDU.  If we called local_hostname_length("manyjars.wpi.edu"), it
returns 8.  Other examples:

Host name	Length returned
---------	---------------
manyjars.wpi.edu	8
manyjars		0
nic.near.net		0

With this in mind, we wrote this function:

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <stdio.h>
#include <resolv.h>
#include <unistd.h>
#include <stdlib.h>

int local_hostname_length(hostname)
     char *hostname;
{
  int len_host, len_domain;

  if (!*_res.defdname) res_init();
  if (((len_host = strlen(hostname)) > (len_domain = strlen(_res.defdname))) &&
      (strcasecmp(hostname + len_host - len_domain,_res.defdname) == 0) &&
      hostname[len_host - len_domain - 1] == '.')
    return(len_host - len_domain - 1);
  else
    return(0);
}

Maybe this can be included in 4.9.2's libresolv.a so it will work properly
under Ultrix without pulling in libc.a's gethostent.o.  If anyone has more
information on Ultrix's local_hostname_length, please let me know so we can
come up with a more complete replacement.

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