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Code Issues Releases Wiki Activity

1715. [func] 'dig +trace' now randomly selects the next servers

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to try.  Report if there is a bad delegation.
This commit is contained in:
Mark Andrews
2004-10-07 02:21:48 +00:00
parent 207f0a15bb
commit 722ebc3a47
3 changed files with 46 additions and 4 deletions
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3
CHANGES
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@@ -64,7 +64,8 @@
1716. [doc] named.conf(5) was being installed in the wrong
location. [RT# 12441]
1715. [placeholder] rt11681
1715. [func] 'dig +trace' now randomly selects the next servers
to try. Report if there is a bad delegation.
1714. [bug] dig/host/nslookup were only trying the first
address when a nameserver was specified by name.

44
bin/dig/dighost.c
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@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: dighost.c,v 1.269 2004/10/05 03:01:47 marka Exp $ */
/* $Id: dighost.c,v 1.270 2004/10/07 02:21:48 marka Exp $ */
/*
* Notice to programmers: Do not use this code as an example of how to
@@ -1405,6 +1405,7 @@ followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section)
isc_result_t result;
isc_boolean_t success = ISC_FALSE;
int numLookups = 0;
dns_name_t *domain;
INSIST(!free_now);
@@ -1431,6 +1432,20 @@ followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section)
debug("found NS set");
if (query->lookup->trace && !query->lookup->trace_root) {
dns_namereln_t namereln;
unsigned int nlabels;
int order;
domain = dns_fixedname_name(&query->lookup->fdomain);
namereln = dns_name_fullcompare(name, domain,
&order, &nlabels);
if (namereln == dns_namereln_equal)
printf(";; BAD (HORIZONTAL) REFERRAL\n");
else if (namereln != dns_namereln_subdomain)
printf(";; BAD REFERRAL\n");
}
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
@@ -1466,6 +1481,9 @@ followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section)
lookup->ns_search_only =
query->lookup->ns_search_only;
lookup->trace_root = ISC_FALSE;
dns_fixedname_init(&lookup->fdomain);
domain = dns_fixedname_name(&lookup->fdomain);
dns_name_copy(name, domain, NULL);
}
srv = make_server(namestr, namestr);
debug("adding server %s", srv->servername);
@@ -1479,7 +1497,29 @@ followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section)
(query->lookup->trace || query->lookup->ns_search_only))
return (followup_lookup(msg, query, DNS_SECTION_AUTHORITY));
return numLookups;
/*
* Randomize the order the nameserver will be tried.
*/
if (numLookups > 1) {
isc_uint32_t i, j;
dig_serverlist_t my_server_list;
ISC_LIST_INIT(my_server_list);
for (i = numLookups; i > 0; i--) {
isc_random_get(&j);
j %= i;
srv = ISC_LIST_HEAD(lookup->my_server_list);
while (j-- > 0)
srv = ISC_LIST_NEXT(srv, link);
ISC_LIST_DEQUEUE(lookup->my_server_list, srv, link);
ISC_LIST_APPEND(my_server_list, srv, link);
}
ISC_LIST_APPENDLIST(lookup->my_server_list,
my_server_list, link);
}
return (numLookups);
}
/*

3
bin/dig/include/dig/dig.h
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@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: dig.h,v 1.86 2004/09/06 01:24:44 marka Exp $ */
/* $Id: dig.h,v 1.87 2004/10/07 02:21:48 marka Exp $ */
#ifndef DIG_H
#define DIG_H
@@ -176,6 +176,7 @@ isc_boolean_t sigchase;
dst_context_t *tsigctx;
isc_buffer_t *querysig;
isc_uint32_t msgcounter;
dns_fixedname_t fdomain;
};
struct dig_query {