1 #ifndef lint 2 static char sccsid[] = "@(#)query.c 4.5 10/07/82"; 3 #endif 4 5 #include <sys/param.h> 6 #include <sys/protosw.h> 7 #include <sys/socket.h> 8 #include <net/in.h> 9 #include <errno.h> 10 #include <stdio.h> 11 #include <netdb.h> 12 #include "rip.h" 13 14 int s; 15 char packet[MAXPACKETSIZE]; 16 17 main(argc, argv) 18 int argc; 19 char *argv[]; 20 { 21 int cc, count; 22 struct sockaddr from; 23 24 if (argc < 2) { 25 printf("usage: query hosts...\n"); 26 exit(1); 27 } 28 s = socket(SOCK_DGRAM, 0, 0, 0); 29 if (s < 0) { 30 perror("socket"); 31 exit(2); 32 } 33 argv++, argc--; 34 count = argc; 35 while (argc > 0) { 36 query(*argv); 37 argv++, argc--; 38 } 39 40 /* 41 * Listen for returning packets 42 */ 43 while (count > 0) { 44 cc = receive(s, &from, packet, sizeof (packet)); 45 if (cc <= 0) { 46 if (cc < 0) { 47 perror("receive"); 48 (void) close(s); 49 exit(1); 50 } 51 continue; 52 } 53 rip_input(&from, cc); 54 count--; 55 } 56 } 57 58 query(host) 59 char *host; 60 { 61 struct sockaddr_in router; 62 register struct rip *msg = (struct rip *)packet; 63 struct hostent *hp; 64 struct servent *sp; 65 66 bzero((char *)&router, sizeof (router)); 67 hp = gethostbyname(host); 68 if (hp == 0) { 69 printf("%s: unknown\n", host); 70 exit(1); 71 } 72 bcopy(hp->h_addr, &router.sin_addr, hp->h_length); 73 router.sin_family = AF_INET; 74 sp = getservbyname("router", "udp"); 75 if (sp == 0) { 76 printf("udp/router: service unknown\n"); 77 exit(1); 78 } 79 router.sin_port = htons(sp->s_port); 80 msg->rip_cmd = RIPCMD_REQUEST; 81 msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; 82 msg->rip_nets[0].rip_metric = HOPCNT_INFINITY; 83 if (send(s, &router, packet, sizeof (struct rip)) < 0) 84 perror(host); 85 } 86 87 /* 88 * Handle an incoming routing packet. 89 */ 90 rip_input(from, size) 91 struct sockaddr_in *from; 92 int size; 93 { 94 register struct rip *msg = (struct rip *)packet; 95 struct netinfo *n; 96 char *name; 97 struct hostent *hp; 98 struct netent *np; 99 100 if (msg->rip_cmd != RIPCMD_RESPONSE) 101 return; 102 hp = gethostbyaddr(&from->sin_addr, sizeof (struct in_addr), AF_INET); 103 name = hp == 0 ? "???" : hp->h_name; 104 printf("from %s(%x):\n", name, from->sin_addr); 105 size -= sizeof (int); 106 n = msg->rip_nets; 107 while (size > 0) { 108 register struct sockaddr_in *sin; 109 110 if (size < sizeof (struct netinfo)) 111 break; 112 sin = (struct sockaddr_in *)&n->rip_dst; 113 if (inet_lnaof(sin->sin_addr) == INADDR_ANY) { 114 np = getnetbyaddr(inet_netof(sin->sin_addr), AF_INET); 115 name = np ? np->n_name : "???"; 116 } else { 117 hp = gethostbyaddr(&sin->sin_addr, 118 sizeof (struct in_addr), AF_INET); 119 name = hp ? hp->h_name : "???"; 120 } 121 printf("\t%s(%x), metric %d\n", name, 122 sin->sin_addr, n->rip_metric); 123 size -= sizeof (struct netinfo), n++; 124 } 125 } 126