1 # struct netinfo { 2 # struct sockaddr rip_dst; /* destination net/host */ 3 # int rip_metric; /* cost of route */ 4 # }; 5 # struct rip { 6 # u_char rip_cmd; /* request/response */ 7 # u_char rip_vers; /* protocol version # */ 8 # u_char rip_res1[2]; /* pad to 32-bit boundary */ 9 # union { 10 # struct netinfo ru_nets[1]; /* variable length... */ 11 # char ru_tracefile[1]; /* ditto ... */ 12 # } ripun; 13 #define rip_nets ripun.ru_nets 14 #define rip_tracefile ripun.ru_tracefile 15 #define RIPCMD_REQUEST 1 /* want info */ 16 #define RIPCMD_RESPONSE 2 /* responding to request */ 17 #define RIPCMD_TRACEON 3 /* turn tracing on */ 18 #define RIPCMD_TRACEOFF 4 /* turn it off */ 19 #define HOPCNT_INFINITY 16 /* per Xerox NS */ 20 #define MAXPACKETSIZE 512 /* max broadcast size */ 21 22 ### RIP packet redux 23 ### UDP send FROM clued-rtr/520 to target/520 24 2 # RIPCMD_RESPONSE 25 1 # version 26 0 # padding 27 0 28 29 # sockaddr-plus-metric structs begin, as many as necessary... 30 0 # len 31 2 # AF_INET 32 0 # port 33 0 34 # addr bytes: 35 X 36 Y 37 Z 38 Q 39 0 # filler, out to 16 bytes [sizeof (sockaddr)] ... 40 0 41 0 42 0 43 0 44 0 45 0 46 0 47 0 # metric: net-order integer 48 0 49 0 50 1 51 52 ## that's it 53
