check_dig not working as expected (plugins 1.4.15)

[Yueh-Hung Liu]

use check_dns


On Sun, Apr 24, 2011 at 9:45 PM, Benjamin KRAFT <benj at dotnul.com> wrote:
> Hello,
>
> I just wanted to pop-out if nobody already did that check_dig doesn't behave like it should on my centos machine.
>
> I was trying to validate the fact that my authoritative server at 80.92.90.249 resolves my website to the corresponding ip address, like this :
>
> [root at nagg ns1]# /usr/local/nagios/libexec/check_dig -H 80.92.90.249 -l www.dotnul.com -a 78.46.96.219 -A "+tcp"
> DNS OK - 0.009 seconds response time (www.dotnul.com.  3600 IN A 78.46.96.219)|time=0.009035s;;;0.000000
>
> That's ok - but I noticed when I misspasted the expected return IP address, that the check returns OK if I put the address of the queried server as expected result.
>
> [root at nagg ns1]# /usr/local/nagios/libexec/check_dig -H 80.92.90.249 -l www.dotnul.com -a 80.92.90.249 -A "+tcp"
> DNS OK - 0.006 seconds response time (;; SERVER: 80.92.90.249#53(80.92.90.249))|time=0.006368s;;;0.000000
>
> The return of the dig query is :
>
> [root at nagg ns1]# dig www.dotnul.com @80.92.90.249 +tcp
>
> ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> www.dotnul.com @80.92.90.249 +tcp
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1842
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;www.dotnul.com.                        IN      A
>
> ;; ANSWER SECTION:
> www.dotnul.com.         3600    IN      A       78.46.96.219
>
> ;; AUTHORITY SECTION:
> dotnul.com.             86400   IN      NS      ether.dotnul.org.
> dotnul.com.             86400   IN      NS      hypnos.dotnul.org.
> dotnul.com.             86400   IN      NS      tanathos.dotnul.org.
>
> ;; Query time: 1 msec
> ;; SERVER: 80.92.90.249#53(80.92.90.249)
> ;; WHEN: Sun Apr 24 13:44:12 2011
> ;; MSG SIZE  rcvd: 122
>
> By having an eye on nagios-plugins-1.4.15/plugins/check_dig.c, it looks like the following code is involved :
>
>  for(i = 0; i < chld_out.lines; i++) {
>    /* the server is responding, we just got the host name... */
>    if (strstr (chld_out.line[i], ";; ANSWER SECTION:")) {
>
>      /* loop through the whole 'ANSWER SECTION' */
>      for(; i < chld_out.lines; i++) {
>        /* get the host address */
>        if (verbose)
>          printf ("%s\n", chld_out.line[i]);
>
>        if (strstr (chld_out.line[i], (expected_address == NULL ? query_address : expected_address)) != NULL) {
>          msg = chld_out.line[i];
>          result = STATE_OK;
>
>          /* Translate output TAB -> SPACE */
>          t = msg;
>          while ((t = strchr(t, '\t')) != NULL) *t = ' ';
>          break;
>        }
>      }
>
>      if (result == STATE_UNKNOWN) {
>        msg = (char *)_("Server not found in ANSWER SECTION");
>        result = STATE_WARNING;
>      }
>
>      /* we found the answer section, so break out of the loop */
>      break;
>    }
>  }
>
> Shouldn't the command stop reading any following line beginning with ";; " after finding the ANSWER section instead of searching a match in everything until end of chld_out ?
>
> Kind regards,
>
> Benjamin
>
>
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------------------------------------------------------------------------------
Fulfilling the Lean Software Promise
Lean software platforms are now widely adopted and the benefits have been 
demonstrated beyond question. Learn why your peers are replacing JEE 
containers with lightweight application servers - and what you can gain 
from the move. http://p.sf.net/sfu/vmware-sfemails
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null