OK, the answer is no. It fails because:

 

“If the socket protocol supports broadcast and the specified address is a broadcast address for the socket protocol, sendmsg() will fail if the SO_BROADCAST option is not set for the socket.”

 

 

The socket set up by dhcpclient.c needs something like this :

 

int so_broadcast = 1;

status = setsockopt(sockfd,

    SOL_SOCKET, SO_BROADCAST,

    &so_broadcast, sizeof so_broadcast);

 

 

 

De : freeradius-users-bounces+nicolas.chaigneau=capgemini.com@lists.freeradius.org [mailto:freeradius-users-bounces+nicolas.chaigneau=capgemini.com@lists.freeradius.org] De la part de Chaigneau, Nicolas
Envoyé : mercredi 9 juillet 2014 09:54
À : freeradius-users@lists.freeradius.org
Objet : Can dhcpclient handle broadcasting ?

 

Hello,

 

 

I’m trying to use dhcpclient to test broadcasting of a DHCP Discover.

 

I am root so I can use source port 68.

I’m sending the packet to the broadcast address.

 

I get the following error (returned by sendmsg, called from “sendfromto”): “Permission denied”.

 

Is it possible to use dhcpclient from FreeRADIUS in broadcast mode ?

 

 

 

Regards,

Nicolas.

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