v4.0.x - DHCP - incomplete decoding of IPv4 attribute
nicolas.chaigneau at capgemini.com
Wed Feb 21 19:01:05 CET 2018
> > In function fr_dhcpv4_packet_decode:
> > https://github.com/FreeRADIUS/freeradius-server/blob/ce6c2c641194a49b70d6c6e9335f900d5f0a699c/src/protocols/dhcpv4/packet.c#L162
> > case FR_TYPE_IPV4_ADDR:
> > memcpy(&vp->vp_ipv4addr, p, 4);
> > break;
> > I had to add the following two lines after the memcpy:
> > vp->data.vb_ip.af = AF_INET;
> > vp->data.vb_ip.prefix = 32;
> Nah that's the DHCPv4 code, haven't touched that. I'm working on v6. Just swapped out most of that switch statement for a call to fr_value_box_from_network... woo code reuse.
Ooh new shiny code. :)
You've broken something though, now decoding the response fails:
dhcpclient: Failed decoding packet: Found trailing garbage parsing type "ether". Expected length <= 6 bytes, got 16 bytes
Although an ethernet address is indeed on 6 bytes, the DHCP field "chaddr" is padded to 16 characters with zeroes.
I've fixed this by restoring these lines here:
memcpy(vp->vp_ether, p, sizeof(vp->vp_ether));
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