Named revisited ...

Sir Hoyt hoyt at polyslo.CalPoly.EDU
Tue Sep 20 13:15:31 AEST 1988


	We too were having problems keeping named 4.8 running on
	our Pyramid 98x.  I tracked the problem down to
	this line in ns_resp.c :

		cp = newmsg + sizeof(HEADER) +
		(cname ? dn_skipname(cp, newmsg + newmsglen) : n) + QFIXEDSZ;

	It seems that the Pyramid's C compiler was producing bad code.
	After the adds in the line cp would be equal to 0x112, which is not 
	correct when newmsg = <some valid address> (greater then 0x112 :-), 
	n = 14, cname = 0, and both sizeof(HEADER) and QFIXEDSZ are positive.

	The following changes to ns_resp.c 'fixed' the 
	problem of named dying:


466 	if (cname)
467 		cp += dn_skipname(cp, newmsg + newmsglen) + QFIXEDSZ;
468 	if ((n = dn_expand(newmsg, newmsg + newmsglen,
469 		cp, dname, sizeof(name))) < 0) {
470 #ifdef DEBUG
471 		if (debug)
472 			fprintf(ddt,"dn_expand failed\n" );
473 #endif
474 		goto servfail;
475 	}
476 #ifdef pyr
477 	cp = newmsg + sizeof(HEADER);
478 	cp = cp + (cname ? dn_skipname(cp, newmsg + newmsglen) : n);
479 	cp = cp + QFIXEDSZ;
480 #else
481 	cp = newmsg + sizeof(HEADER) +
482 	    (cname ? dn_skipname(cp, newmsg + newmsglen) : n) + QFIXEDSZ;
483 #endif pyr
484 
485 	buflen = sizeof(newmsg) - (cp - newmsg);
486 
487 try_again:


-- 
John H. Pochmara				 A career is great, 
UUCP: {csun,voder,trwind}!polyslo!hoyt		 But you can't run your 
Internet: hoyt at polyslo.CalPoly.EDU		 fingers through its hair
							-Graffiti 4/13/83



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