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|
# struct netinfo {
# struct sockaddr rip_dst; /* destination net/host */
# int rip_metric; /* cost of route */
# };
# struct rip {
# u_char rip_cmd; /* request/response */
# u_char rip_vers; /* protocol version # */
# u_char rip_res1[2]; /* pad to 32-bit boundary */
# union {
# struct netinfo ru_nets[1]; /* variable length... */
# char ru_tracefile[1]; /* ditto ... */
# } ripun;
#define rip_nets ripun.ru_nets
#define rip_tracefile ripun.ru_tracefile
#define RIPCMD_REQUEST 1 /* want info */
#define RIPCMD_RESPONSE 2 /* responding to request */
#define RIPCMD_TRACEON 3 /* turn tracing on */
#define RIPCMD_TRACEOFF 4 /* turn it off */
#define HOPCNT_INFINITY 16 /* per Xerox NS */
#define MAXPACKETSIZE 512 /* max broadcast size */
### RIP packet redux
### UDP send FROM clued-rtr/520 to target/520
2 # RIPCMD_RESPONSE
1 # version
0 # padding
0
# sockaddr-plus-metric structs begin, as many as necessary...
0 # len
2 # AF_INET
0 # port
0
# addr bytes:
X
Y
Z
Q
0 # filler, out to 16 bytes [sizeof (sockaddr)] ...
0
0
0
0
0
0
0
0 # metric: net-order integer
0
0
1
## that's it
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