Package: dnsutils
Version: 1:9.8.1.dfsg.P1-4.2
Severity: normal
File: /usr/bin/dig
Tags: patch
Hi,
I noticed the "Received" line shown by +trace option contains two IP addresses
like this: 192.203.230.10#53(192.203.230.10)
However, in dig version 9.7, the later IP address was a hostname like this:
192.33.14.30#53(b.gtld-servers.net)
Here is a comparison between version 9.8.1 and 9.7.3:
% dig +trace www.example.com
; <<>> DiG 9.8.1-P1 <<>> +trace www.example.com
;; global options: +cmd
. 23473 IN NS a.root-servers.net.
. 23473 IN NS b.root-servers.net.
[...]
. 23473 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 228 ms
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
[...]
com. 172800 IN NS m.gtld-servers.net.
;; Received 496 bytes from 192.203.230.10#53(192.203.230.10) in 385 ms
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 169 bytes from 192.35.51.30#53(192.35.51.30) in 195 ms
www.example.com. 172800 IN A 192.0.43.10
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 97 bytes from 199.43.132.53#53(199.43.132.53) in 140 ms
% dig +trace www.example.com
; <<>> DiG 9.7.3 <<>> +trace www.example.com
;; global options: +cmd
. 22141 IN NS a.root-servers.net.
[...]
. 22141 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 27 ms
com. 172800 IN NS h.gtld-servers.net.
[...]
com. 172800 IN NS c.gtld-servers.net.
;; Received 493 bytes from 128.8.10.90#53(d.root-servers.net) in 203 ms
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 169 bytes from 192.33.14.30#53(b.gtld-servers.net) in 67 ms
www.example.com. 172800 IN A 192.0.43.10
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 97 bytes from 199.43.132.53#53(a.iana-servers.net) in 124 ms
I think showing the same two IP addresses is not useful and is not an expected
behavior.
So I investigated the source code of dig to solve this problem.
The "Received" lines are printed in dig.c as following.
In this code, the value of query->servname was a hostname in version 9.7, but
now is an IP addresses.
printf(";; Received %" ISC_PRINT_QUADFORMAT "u bytes "
"from %s(%s) in %d ms\n\n",
query->lookup->doing_xfr ?
query->byte_count : (isc_uint64_t)bytes,
fromtext, query->servname,
(int)diff/1000);
Luckily, query has an another member "userarg" which holds the hostname.
Simply using query->userarg instead of query->servname seems to solve the
problem.
--- dig.c.orig 2011-03-11 15:46:58.000000000 +0900
+++ dig.c 2012-10-13 02:40:42.507458925 +0900
@@ -276,7 +276,7 @@
"from %s(%s) in %d ms\n\n",
query->lookup->doing_xfr ?
query->byte_count : (isc_uint64_t)bytes,
- fromtext, query->servname,
+ fromtext, query->userarg,
(int)diff/1000);
}
}
By applying the above patch, dig shows the hostname in the "Received" line like
before.
% ./dig +trace www.example.com
; <<>> DiG 9.8.1-P1 <<>> +trace www.example.com
;; global options: +cmd
. 19809 IN NS a.root-servers.net.
[...]
. 19809 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 223 ms
com. 172800 IN NS a.gtld-servers.net.
[...]
com. 172800 IN NS m.gtld-servers.net.
;; Received 496 bytes from 192.203.230.10#53(e.root-servers.net) in 377 ms
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 169 bytes from 192.54.112.30#53(h.gtld-servers.net) in 305 ms
www.example.com. 172800 IN A 192.0.43.10
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; Received 97 bytes from 199.43.132.53#53(a.iana-servers.net) in 132 ms
Regards,
-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 3.2.0-4-686-pae (SMP w/2 CPU cores)
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages dnsutils depends on:
ii bind9-host [host] 1:9.8.1.dfsg.P1-4.2
ii host 1:9.8.1.dfsg.P1-4.2
ii libbind9-80 1:9.8.1.dfsg.P1-4.2
ii libc6 2.13-35
ii libcap2 1:2.22-1.2
ii libdns81 1:9.8.1.dfsg.P1-4.2
ii libgssapi-krb5-2 1.10.1+dfsg-2
ii libisc83 1:9.8.1.dfsg.P1-4.2
ii libisccfg82 1:9.8.1.dfsg.P1-4.2
ii libkrb5-3 1.10.1+dfsg-2
ii liblwres80 1:9.8.1.dfsg.P1-4.2
ii libssl1.0.0 1.0.1c-4
dnsutils recommends no packages.
Versions of packages dnsutils suggests:
pn rblcheck <none>
-- no debconf information
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