invalid hostname

[Simon Østengaard]

As Patrick wrote:

Here is the code that is causing you problems:

/* from RFC-1035
 *
 * The labels must follow the rules for ARPANET host names.  They must
 * start with a letter, end with a letter or digit, and have as interior
 * characters only letters, digits, and hyphen.  There are also some
 * restrictions on the length.  Labels must be 63 characters or less. */

int
is_hostname (char *s1)
{
        if (!s1 || strlen (s1) > 63) {
                return FALSE;
        }
        if (strcspn (s1,
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUWVXYZ0123456789-.")
!= 0) {
                return FALSE;
        }
        if (strspn (s1, "0123456789-.") == 1) { /* change to if (strspn (s1, "-.") == 1) { */
                return FALSE;
        }
        while ((s1 = index (s1, '.'))) {
                s1++;
                if (strspn (s1, "0123456789-.") == 1) { /* change to if (strspn (s1, "-.") == 1) { */
                        return FALSE;
                }
        }
        return TRUE;
}

in the utils.c

delete the number in the check and the plugin will check mail.2aa.dk.

I have tried the latest snapshot but it still won't check mail.2aa.dk

:) Simon




Iain Young wrote:

>On Tue, May 06, 2003 at 09:48:49AM -0400, Simon Wrote:
>
>  
>
>>The plugin refuses to check a host that contains a number in the
>>beginning of the hosts fully-qualified-domain-name. I.e mail.2aa.dk.
>>    
>>
>
>Actually, IIRC, that is the correct DNS behaviour, according to
>RFC1034. Relavent paragraph from 1034:
>
>The labels must follow the rules for ARPANET host names.  They must
>start with a letter, end with a letter or digit, and have as interior
>characters only letters, digits, and hyphen.  There are also some
>restrictions on the length.  Labels must be 63 characters or less.
>
>[SNIP]
>
>  
>
>>[root at columbia nagios-plugins-1.3.0]# telnet mail.2aa.dk 25
>>Trying 80.80.7.208...
>>Connected to mail.2aa.dk.
>>Escape character is '^]'.
>>220 mail.2aa.dk ESMTP Tue, 06 May 2003 15:02:58 +0200
>>    
>>
>
>telnet, $MTA, and your resolver/DNS servers being kind. And yes
>it works, and will probably continue to work, but strict adherence
>to 1034 specifies that they are 'illegal'.
>
>My understanding is that a strict implementation of 1034/DNS would
>fail to resolve labels starting with a digit.
>
>  
>
>>>Any help will be usefull.
>>>      
>>>
>
>How is the plugin determining what a legal hostname is ? Does
>it have a switch or option to make it more kind ?
>
>
>Iain
>
>
>-------------------------------------------------------
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>
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>  
>




-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com

_______________________________________________
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