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@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;;;0.00
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@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;;;0.00
The return of the dig query is :
[root@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. 3600IN 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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