📄 cs427 talking to the zebra daemon.htm
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Zebra defines a protocol, called the Zebra protocol, for communicating with the various routing protocols. If someone wants to add a new routing protocol to the Zebra software, then they have to implement this interface in order to interact with the manager daemon. The communication with Zebra daemon provides information about interfaces and routes, allowing you to know which interfaces exist and their configurations, and which routes are installed and by what daemons (ospf, bgp, ...).
The zclient.h library declares the API. It defines the main structure, zclient, for talking to the main daemon and many function prototypes. The elements of zclient are as follows:
* sock (Socket to zebra daemon.)
...
* thread *t_read;
* thread *t_connect;
* ...
* Pointer to the callback functions
* int (*interface_add) (int, struct zclient *, zebra_size_t);
* int (*interface_delete) (int, struct zclient *, zebra_size_t);
* int (*interface_up) (int, struct zclient *, zebra_size_t);
* int (*interface_down) (int, struct zclient *, zebra_size_t);
* int (*interface_address_add) (int, struct zclient *, zebra_size_t);
* int (*interface_address_delete) (int, struct zclient *, zebra_size_t);
* int (*ipv4_route_add) (int, struct zclient *, zebra_size_t);
* int (*ipv4_route_delete) (int, struct zclient *, zebra_size_t);
* int (*ipv6_route_add) (int, struct zclient *, zebra_size_t);
* int (*ipv6_route_delete) (int, struct zclient *, zebra_size_t);
All the routing protocols implement a file called <protocol_name>_zebra.c which implements the API defined in zclient.h. Each protocol fills in the callback functions in the zclient structure and the command node to be installed. Other command elements are installed as well in the respective command nodes. These functions are called whenever such an event happens.
For example, the RIP protocol implements the communication protocol in a file named rip_zebra.c and implements the following callback functions
int rip_interface_add (int, struct zclient *, zebra_size_t);
int rip_interface_delete (int, struct zclient *, zebra_size_t);
int rip_interface_address_add (int, struct zclient *, zebra_size_t);
int rip_interface_address_delete (int, struct zclient *, zebra_size_t);
int rip_interface_up (int, struct zclient *, zebra_size_t);
int rip_interface_down (int, struct zclient *, zebra_size_t);
<b>Very short summary of ripd startup</b>
* rip started ?calls main() in rip_main.c
* main() calls rip_zclient_init() in rip_zebra.c
* rip_zclient_init( ) sets default value to the zebra client structure, installs zebra node, and installs command elements into the zebra node and the rip node.
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<P><BR>
<P>
<P>Zebra defines a protocol, called the Zebra protocol, for communicating with
the various routing protocols. If someone wants to add a new routing protocol to
the Zebra software, then they have to implement this interface in order to
interact with the manager daemon. The communication with Zebra daemon provides
information about interfaces and routes, allowing you to know which interfaces
exist and their configurations, and which routes are installed and by what
daemons (ospf, bgp, ...).
<P>The zclient.h library declares the API. It defines the main structure,
zclient, for talking to the main daemon and many function prototypes. The
elements of zclient are as follows:
<P>
<UL>
<LI>sock (Socket to zebra daemon.) ...
<LI>thread *t_read;
<LI>thread *t_connect;
<LI>...
<LI>Pointer to the callback functions
<LI>int (*interface_add) (int, struct zclient *, zebra_size_t);
<LI>int (*interface_delete) (int, struct zclient *, zebra_size_t);
<LI>int (*interface_up) (int, struct zclient *, zebra_size_t);
<LI>int (*interface_down) (int, struct zclient *, zebra_size_t);
<LI>int (*interface_address_add) (int, struct zclient *, zebra_size_t);
<LI>int (*interface_address_delete) (int, struct zclient *, zebra_size_t);
<LI>int (*ipv4_route_add) (int, struct zclient *, zebra_size_t);
<LI>int (*ipv4_route_delete) (int, struct zclient *, zebra_size_t);
<LI>int (*ipv6_route_add) (int, struct zclient *, zebra_size_t);
<LI>int (*ipv6_route_delete) (int, struct zclient *, zebra_size_t);
</LI></UL>All the routing protocols implement a file called
<PROTOCOL_NAME>_zebra.c which implements the API defined in zclient.h. Each
protocol fills in the callback functions in the zclient structure and the
command node to be installed. Other command elements are installed as well in
the respective command nodes. These functions are called whenever such an event
happens.
<P>For example, the RIP protocol implements the communication protocol in a file
named rip_zebra.c and implements the following callback functions
<P>int rip_interface_add (int, struct zclient *, zebra_size_t); int
rip_interface_delete (int, struct zclient *, zebra_size_t); int
rip_interface_address_add (int, struct zclient *, zebra_size_t); int
rip_interface_address_delete (int, struct zclient *, zebra_size_t); int
rip_interface_up (int, struct zclient *, zebra_size_t); int rip_interface_down
(int, struct zclient *, zebra_size_t);
<P>
<P><B>Very short summary of ripd startup</B>
<P>
<UL>
<LI>rip started ?calls main() in rip_main.c </LI></UL>
<UL>
<LI>main() calls rip_zclient_init() in rip_zebra.c </LI></UL>
<UL>
<LI>rip_zclient_init( ) sets default value to the zebra client structure,
installs zebra node, and installs command elements into the zebra node and the
rip node. </LI></UL>
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