[Kea-users] Getting the interface name in hooks

[Marcin Siodelski]

That's because the load() function is called as a result of parsing
server configuration when your hook library is loaded. At this point
there is no committed server configuration yet (because server
configuration is being parsed). What you could try is:

ConstCfgIfacePtr cfg =  CfgMgr::instance().getStagingCfg()->getCfgIface();

instead of

ConstCfgIfacePtr cfg =  CfgMgr::instance().getCurrentCfg()->getCfgIface();

because "staging" configuration should already contain the information
about interfaces (the interfaces parser is launched before the hooks
libs parser).

Give it a try.

Marcin

On 23.08.2017 19:57, Gokulakrishnan Gopalakrishnan wrote:
> Marcin,
> When I placed the code in "load(LibraryHandle&), I'm getting empty
> interface list, whereas if I keep the code in another hook like
> pkt4_send, I'm getting the proper list of interfaces.
> Actually, I'd be needing this info while initializing the Kea Process
> itself. Can we get it somehow?
>
> On Wed, Aug 23, 2017 at 8:02 PM, Gokulakrishnan Gopalakrishnan
> <ggopalakrishnan at salesforce.com <mailto:ggopalakrishnan at salesforce.com>>
> wrote:
>
>     Thanks Marcin. It worked
>
>     On Wed, Aug 23, 2017 at 4:28 PM, Marcin Siodelski <marcin at isc.org
>     <mailto:marcin at isc.org>> wrote:
>
>         You'd rather need to link with this:
>
>         libdhcp_user_chk_la_LIBADD  +=
>         $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
>         <http://libkea-dhcpsrv.la>
>
>         In most cases you'd also need to link with libkea-dhcpsrv.la
>         <http://libkea-dhcpsrv.la>
>         dependencies which you can find it its Makefile.am.
>
>         As for the automake error it seems to me that you're missing
>         automake-1.14. Perhaps you have some different version?
>         automake-1.15?
>
>         Maybe go to Kea root directory and run autoreconf --install &&
>         ./configure ... && make
>
>         again.
>
>         Marcin
>
>         On 23.08.2017 12:41, Gokulakrishnan Gopalakrishnan wrote:
>         > Thanks Marcin, I just did what you mentioned in the code and
>         > printed *iface_configuation->str()* and it prints an empty array
>         > interface. Probably because I didn't link the hook user_chk
>         > with *libkea-dhcpsrv*.
>         > I tried linking* **libkea-dhcpsrv *by adding
>         >
>         > libdhcp_user_chk_la_LIBADD  +=
>         $(top_builddir)/src/lib/hooks/libkea-dhcpsrv.la
>         <http://libkea-dhcpsrv.la> <http://libkea-dhcpsrv.la>
>         >
>         > in src/hooks/dhcp/user_chk/Makefile.am <http://efile.am> and
> did a make.
>         >
>         > I'm getting automake-1.14: command not found. Every time editing
>         > Makefile.am, I'm getting this error. Am I doing the linking
> correctly?
>         > Am I missing something here? Please correct me if I'm wrong
>         >
>         >
>         >
>         >
>         > On Wed, Aug 23, 2017 at 3:09 PM, Marcin Siodelski
> <marcin at isc.org <mailto:marcin at isc.org>
>         > <mailto:marcin at isc.org <mailto:marcin at isc.org>>> wrote:
>         >
>         >     On 23.08.2017 11:24, Gokulakrishnan Gopalakrishnan wrote:
>         >     > "interfaces-config": {
>         >     >
>         >     >         "interfaces": [ "eth0" ]
>         >     >
>         >     >   }
>         >     >
>         >     > Can we get the list of interface name in hooks code? In
>         the example
>         >     > mentioned above, can we get the value "eth0" in hooks
>         code in
>         >     > <int load(LibraryHandle&)> function?
>         >     >
>         >     >
>         >
>         >     To retrieve server configuration information you'd need to
>         link your
>         >     hook library with libkea-dhcpsrv and do something like this:
>         >
>         >     #include <dhcpsrv/cfg_iface.h>
>         >
>         >     ConstCfgIfacePtr cfg =
>         >     CfgMgr::instance().getCurrentCfg()->getCfgIface();
>         >     ElementPtr iface_configuation = cfg->toElement();
>         >
>         >     The iface_configuration will now hold the conifguration
>         structure you're
>         >     looking for.
>         >
>         >     Marcin Siodelski
>         >     ISC
>         >
>         >
>
>
>