Encapsulated match if

Wed Mar 5 14:54:08 UTC 2008

The client doesn't have to set the option to request it. option 55 is a
list of parameters that the client would like returned by the server.

regards,
-glenn

>To: dhcp-users at isc.org
>Subject: Re: Encapsulated match if 
>Date: Wed, 05 Mar 2008 08:25:34 CST
>From: John Hascall <john at iastate.edu>
>
>I've never used this one, but it looks like you can just say:
>
>   if exists option-67 {
>   }
>
>if you want to know if the client requested option-67 -- no
>need to manually poke around in dhcp-parameter-request-list.
>
>John
>
>> I just read the eval man page.
>> If I don't misunderstand it, exists check if the content of an option is =
>> not null, ie :
>> if exists dhcp-parameter-request-list {
>>                # Always send the PXELINUX options (specified in =
>> hexadecimal)
>>                option dhcp-parameter-request-list =3D concat(option =
>> dhcp-parameter-request-list,d0,d1,d2,d3);
>> }
>> 
>> But, what I want is to check if a given code option is present in the =
>> option 55 (dhcp-parameter-request-list) which contains in fact a =
>> concatenation of option codes (requested by the client).
>> 
>> Thx for all
>> 
>> Olivier
>> -----Message d'origine-----
>> De : dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] De la =
>> part de John Hascall
>> Envoy=E9 : mercredi 5 mars 2008 14:56
>> =C0 : dhcp-users at isc.org
>> Objet : Re: Encapsulated match if=20
>> 
>> 
>> 
>> I think you want 'exists' -- see 'man dhcp-eval'.
>> 
>> John
>> 
>> 
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>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT =
>> SIZE=3D2 FACE=3D"Courier New">I just read the eval man =
>> page.</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT =
>> SIZE=3D2 FACE=3D"Courier New">If I don't misunderstand it, exists check =
>> if the content of an option is not null, ie :</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT =
>> SIZE=3D2 FACE=3D"Courier New">if</FONT></SPAN><SPAN =
>> LANG=3D"fr"><B></B></SPAN><B><SPAN LANG=3D"en-gb"> <FONT SIZE=3D2 =
>> FACE=3D"Courier New">exists</FONT></SPAN></B><SPAN =
>> LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New"> dhcp-parameter-request-list {</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">           &n=
>> bsp;   # Always send the PXELINUX options (specified in =
>> hexadecimal)</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">           &n=
>> bsp;   option dhcp-parameter-request-list =3D concat(option =
>> dhcp-parameter-request-list,d0,d1,d2,d3);</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">}</FONT></SPAN><SPAN LANG=3D"fr"></SPAN><SPAN =
>> LANG=3D"en-gb"></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">But, what I want is to check if a</FONT></SPAN><SPAN =
>> LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"> <FONT SIZE=3D2 FACE=3D"Courier =
>> New">given</FONT></SPAN><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"> =
>> <FONT SIZE=3D2 FACE=3D"Courier New">code option is present =
>> in</FONT></SPAN><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"> <FONT =
>> SIZE=3D2 FACE=3D"Courier New">the option 55</FONT></SPAN><SPAN =
>> LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New"> (</FONT></SPAN><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT =
>> SIZE=3D2 FACE=3D"Courier =
>> New">dhcp-parameter-request-list</FONT></SPAN><SPAN =
>> LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">) which contains in fact a concatenation of option codes (requested =
>> by the client).</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN><SPAN LANG=3D"en-gb"><FONT =
>> SIZE=3D2 FACE=3D"Courier New">Thx for all</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">Olivier</FONT></SPAN><SPAN LANG=3D"fr"></SPAN><SPAN =
>LANG=3D"en-gb"></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">-----Message d'origine-----<BR>
>> De=A0: dhcp-users-bounce at isc.org [<A =
>> HREF=3D"mailto:dhcp-users-bounce at isc.org">mailto:dhcp-users-bounce at isc.or=
>> g</A>] De la part de John Hascall<BR>
>> Envoy=E9=A0: mercredi 5 mars 2008 14:56<BR>
>> =C0=A0: dhcp-users at isc.org<BR>
>> Objet=A0: Re: Encapsulated match if</FONT></SPAN><SPAN LANG=3D"fr"> =
>> </SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"><FONT SIZE=3D2 FACE=3D"Courier New">I =
>> think you want 'exists' -- see 'man dhcp-eval'.</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"><FONT SIZE=3D2 FACE=3D"Courier =
>> New">John</FONT></SPAN></P>
>> 
>> <P DIR=3DLTR><SPAN LANG=3D"fr"></SPAN></P>
>> 
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