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Recurse to find the root server list with 'dig +trace'.

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This commit is contained in:
Mark Andrews 2019-05-14 11:38:13 +10:00
parent 00ff786384
commit e65d4989a1
4 changed files with 13 additions and 6 deletions
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3
CHANGES
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@ -1,3 +1,6 @@
5237. [bug] Recurse to find the root server list with 'dig +trace'.
[GL #1028]
5236. [func] Add SipHash 2-4 implementation in lib/isc/siphash.c
and switch isc_hash_function() to use SipHash 2-4.
[GL #605]

2
bin/dig/dig.c
View file

@ -1462,7 +1462,7 @@ plus_option(char *option, bool is_batchfile,
lookup->trace = state;
lookup->trace_root = state;
if (state) {
lookup->recurse = false;
lookup->recurse = true;
lookup->identify = true;
lookup->comments = false;
lookup->rrcomments = 0;

6
bin/dig/dig.docbook
View file

@ -1010,8 +1010,10 @@
in the query. This bit is set by default, which means
<command>dig</command> normally sends recursive
queries. Recursion is automatically disabled when
the <parameter>+nssearch</parameter> or
<parameter>+trace</parameter> query options are used.
using the <parameter>+nssearch</parameter> option, and
when using <parameter>+trace</parameter> except for
an initial recursive query to get the list of root
servers.
</para>
</listitem>
</varlistentry>

8
bin/dig/dighost.c
View file

@ -2191,12 +2191,14 @@ setup_lookup(dig_lookup_t *lookup) {
lookup->sendmsg->id = (dns_messageid_t)isc_random16();
lookup->sendmsg->opcode = lookup->opcode;
lookup->msgcounter = 0;
/*
* If this is a trace request, completely disallow recursion, since
* it's meaningless for traces.
* If this is a trace request, completely disallow recursion after
* looking up the root name servers, since it's meaningless for traces.
*/
if (lookup->trace || (lookup->ns_search_only && !lookup->trace_root))
if ((lookup->trace || lookup->ns_search_only) && !lookup->trace_root) {
lookup->recurse = false;
}
if (lookup->recurse &&
lookup->rdtype != dns_rdatatype_axfr &&