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-rw-r--r--resolv/res_query.c41
1 files changed, 26 insertions, 15 deletions
diff --git a/resolv/res_query.c b/resolv/res_query.c
index deebf4c62b..00a5e3eec3 100644
--- a/resolv/res_query.c
+++ b/resolv/res_query.c
@@ -1,7 +1,7 @@
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
@@ -13,7 +13,7 @@
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
- *
+ *
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -29,14 +29,14 @@
/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
- *
+ *
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
- *
+ *
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -66,7 +66,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_query.c 8.1 (Berkeley) 6/4/93";
-static const char rcsid[] = "$Id$";
+static const char rcsid[] = "$BINDId: res_query.c,v 8.20 2000/02/29 05:39:12 vixie Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
@@ -184,8 +184,9 @@ res_nsearch(res_state statp,
HEADER *hp = (HEADER *) answer;
char tmp[NS_MAXDNAME];
u_int dots;
- int trailing_dot, ret;
+ int trailing_dot, ret, saved_herrno;
int got_nodata = 0, got_servfail = 0, root_on_list = 0;
+ int tried_as_is = 0;
__set_errno (0);
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); /* True if we never query. */
@@ -202,12 +203,19 @@ res_nsearch(res_state statp,
return (res_nquery(statp, cp, class, type, answer, anslen));
/*
- * If there are enough dots in the name, do no searching.
- * (The threshold can be set with the "ndots" option.)
+ * If there are enough dots in the name, let's just give it a
+ * try 'as is'. The threshold can be set with the "ndots" option.
+ * Also, query 'as is', if there is a trailing dot in the name.
*/
- if (dots >= statp->ndots || trailing_dot)
- return (res_nquerydomain(statp, name, NULL, class, type,
- answer, anslen));
+ saved_herrno = -1;
+ if (dots >= statp->ndots || trailing_dot) {
+ ret = res_nquerydomain(statp, name, NULL, class, type,
+ answer, anslen);
+ if (ret > 0 || trailing_dot)
+ return (ret);
+ saved_herrno = h_errno;
+ tried_as_is++;
+ }
/*
* We do at least one level of search if
@@ -279,10 +287,11 @@ res_nsearch(res_state statp,
}
/*
- * If the name has any dots at all, and "." is not on the search
- * list, then try an as-is query now.
+ * If the name has any dots at all, and no earlier 'as-is' query
+ * for the name, and "." is not on the search list, then try an as-is
+ * query now.
*/
- if (statp->ndots) {
+ if (statp->ndots && !(tried_as_is || root_on_list)) {
ret = res_nquerydomain(statp, name, NULL, class, type,
answer, anslen);
if (ret > 0)
@@ -296,7 +305,9 @@ res_nsearch(res_state statp,
* else send back meaningless H_ERRNO, that being the one from
* the last DNSRCH we did.
*/
- if (got_nodata)
+ if (saved_herrno != -1)
+ RES_SET_H_ERRNO(statp, saved_herrno);
+ else if (got_nodata)
RES_SET_H_ERRNO(statp, NO_DATA);
else if (got_servfail)
RES_SET_H_ERRNO(statp, TRY_AGAIN);