DNS for SunOS 4.1.X systems (provided by Sun)

sunos4-dns.txt

SRDB ID: 3886

SYNOPSIS: Using DNS without NIS

DETAIL DESCRIPTION:

Want to use DNS, but not NIS

SOLUTION SUMMARY:

MAKING A LIBC.SO for DNS without NIS

		     This is a procedure that can be used to add name resolver
		     routines into shared libc library in SunOS_4.1.

		     First load "SHLIB CUSTOM" either from SunInstall or from
		     add_services.

		     Besure to have the file /etc/resolv.conf configured
		     properly. Test this with /usr/etc/nslookup.

1. Become super user:

	% su  (if necessary)

2. Make a temporary directory:

	% cd /usr/lib/shlib.etc
	% mkdir tmp

3. Change to the "tmp" directory just made, extract the pic .o from
   libc_pic.a and rm the file __.SYMDEF. The reason you need to do
   the 2 "mv" commands is because "ar" truncated filenames over
   16 characters.

	% cd tmp
	% ar x ../libc_pic.a
	% rm __.SYMDEF
	% mv rpc_dtablesize. rpc_dtablesize.o
	% mv rpc_commondata. rpc_commondata.o
	% ar x /usr/lib/libresolv.a

    The libresolv.a (apparently) contains object modules position independant,
    so they can be added to the libc_pic modules without fear.

4. Remove the old routine to do the hostname/addr resolution:

	% rm gethostent.o

5. Remove the libresolv module that contains `strncasecmp' (which is now
   in the main C library, so it is redundant):

	% rm strcasecmp.o

6.  % cd ..

7.  Copy lorder-sparc to lorder-sparc.orig.  Edit the file lorder-sparc and
    remove the reference to `gethostent.o' and add the references to the
    resolver library routines by applying this patch:

	remove	:	gethostent.o

	   add	:	gethostnamadr.o
			sethostent.o
			res_query.o
			res_mkquery.o
			res_send.o
			res_debug.o
			res_comp.o
			res_init.o


	% diff -rc2 lorder-sparc.orig lorder-sparc
	*** lorder-sparc.orig   Thu Feb  8 05:27:46 1990
	--- lorder-sparc	Mon Apr  9 12:58:59 1990
	***************
	*** 150,154 ****
	  getwd.o
	  getnetgrent.o
	! gethostent.o
	  ypxdr.o
	  ttyname.o
	--- 150,161 ----
	  getwd.o
	  getnetgrent.o
	! gethostnamadr.o
	! sethostent.o
	! res_query.o
	! res_mkquery.o
	! res_send.o
	! res_debug.o
	! res_comp.o
	! res_init.o
	  ypxdr.o
	  ttyname.o


8. % make libc.so

9. Now some libc.so.x.y.z built in the current directory.  It is recommended
   that you test out this library at this point before installing it.  Can do
   so by setting the environment LD_LIBRARY_PATH to the current directory, for
   example:

   	% setenv LD_LIBRARY_PATH `pwd`
	% your_favorite_test_cmd  (ie. ping, ftp, telnet)

   Once satisfied that the new library worked, proceed to install it with the
   following commands:

	% cp libc.so.x.y.z /usr/lib
	% ldconfig
	% unsetenv LD_LIBRARY_PATH

10. Now running with the new library.  Verify this by doing a trace command
    of let's say "date".

	% trace date

   The output should inform you that the new library is being used.



BUG REPORT ID: n/a
PATCH ID: n/a
PRODUCT AREA: n/a
PRODUCT: DNS
SUNOS RELEASE: SunOS 4.1
UNBUNDLED RELEASE: n/a
HARDWARE: n/a