libc/resolv/res_findzonecut.c

99  *	find enclosing zone for a <dname,class>, and some server addresses
103  *\li	dname - domain name whose enclosing zone is desired
104  *\li	class - class of dname (and its enclosing zone)
120  *\li	we start by asking for an SOA<dname,class>.  if we get one as an
121  *	answer, that just means <dname,class> is a zone top, which is fine.
134  *	match our dname (since that would have been returned in the answer
135  *	section).  an authority section SOA has to be "above" our dname.
139  *	ripping labels off the front of our dname -- this is known as "doing
154 res_findzonecut(res_state statp, const char *dname, ns_class class, int opts,
168 	result = res_findzonecut2(statp, dname, class, opts, zname, zsize,
180 res_findzonecut2(res_state statp, const char *dname, ns_class class, int opts,
189 	DPRINTF(("START dname='%s' class=%s, zsize=%ld, naddrs=%d",
190 		 dname, p_class(class), (long)zsize, naddrs));
198 	if ((n = get_soa(statp, dname, class, opts, zname, zsize,
270 get_soa(res_state statp, const char *dname, ns_class class, int opts,
285 	/* First canonicalize dname (exactly one unescaped trailing "."). */
286 	if (ns_makecanon(dname, tname, sizeof tname) < 0)
288 	dname = tname;
297 		while (*dname == '.')
298 			dname++;
301 		n = do_query(statp, dname, class, ns_t_soa, resp, &msg);
304 				 dname, p_class(class), n));
340 				if (ns_samedomain(dname, t) == 0) {
343 						dname, t)
350 				if (ns_samename(dname, t) == 1 ||
351 				    ns_samedomain(dname, t) == 0) {
354 						dname, t)
388 		if (*dname == '\0')
392 		while (*dname != '.') {
393 			if (*dname == '\\')
394 				if (*++dname == '\0') {
398 			dname++;
661 find_ns(rrset_ns *nsrrsp, const char *dname) {
665 		if (ns_samename(nsrr->name, dname) == 1)
671 do_query(res_state statp, const char *dname, ns_class class, ns_type qtype,
677 	n = res_nmkquery(statp, ns_o_query, dname, class, qtype,