BSD 4_3_Net_1 release

[unix-history] / routed / tools / query.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)query.c     5.9 (Berkeley) 6/11/88";
#endif /* not lint */

#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdio.h>
#include <netdb.h>
#include <protocols/routed.h>

#define WTIME   5               /* Time to wait for all responses */
#define STIME   500000          /* usec to wait for another response */

int     s;
int     timedout, timeout();
char    packet[MAXPACKETSIZE];
extern int errno;
int     nflag;

main(argc, argv)
       int argc;
       char *argv[];
{
       int cc, count, bits;
       struct sockaddr from;
       int fromlen = sizeof(from), size = 32*1024;
       struct timeval shorttime;
       
       if (argc < 2) {
usage:
               printf("usage: query [ -n ] hosts...\n");
               exit(1);
       }
       s = socket(AF_INET, SOCK_DGRAM, 0);
       if (s < 0) {
               perror("socket");
               exit(2);
       }
       if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) < 0)
               perror("setsockopt SO_RCVBUF");

       argv++, argc--;
       if (*argv[0] == '-') {
               switch (argv[0][1]) {
               case 'n':
                       nflag++;
                       break;
               default:
                       goto usage;
               }
               argc--, argv++;
       }
       while (argc > 0) {
               query(*argv);
               count++;
               argv++, argc--;
       }

       /*
        * Listen for returning packets;
        * may be more than one packet per host.
        */
       bits = 1 << s;
       bzero(&shorttime, sizeof(shorttime));
       shorttime.tv_usec = STIME;
       signal(SIGALRM, timeout);
       alarm(WTIME);
       while ((count > 0 && !timedout) ||
           select(20, &bits, 0, 0, &shorttime) > 0) {
               cc = recvfrom(s, packet, sizeof (packet), 0,
                 &from, &fromlen);
               if (cc <= 0) {
                       if (cc < 0) {
                               if (errno == EINTR)
                                       continue;
                               perror("recvfrom");
                               (void) close(s);
                               exit(1);
                       }
                       continue;
               }
               rip_input(&from, cc);
               count--;
       }
       exit (count > 0 ? count : 0);
}

query(host)
       char *host;
{
       struct sockaddr_in router;
       register struct rip *msg = (struct rip *)packet;
       struct hostent *hp;
       struct servent *sp;

       bzero((char *)&router, sizeof (router));
       router.sin_family = AF_INET;
       router.sin_addr.s_addr = inet_addr(host);
       if (router.sin_addr.s_addr == -1) {
               hp = gethostbyname(host);
               if (hp == 0) {
                       printf("%s: unknown\n", host);
                       exit(1);
               }
               bcopy(hp->h_addr, &router.sin_addr, hp->h_length);
       }
       sp = getservbyname("router", "udp");
       if (sp == 0) {
               printf("udp/router: service unknown\n");
               exit(1);
       }
       router.sin_port = sp->s_port;
       msg->rip_cmd = RIPCMD_REQUEST;
       msg->rip_vers = RIPVERSION;
       msg->rip_nets[0].rip_dst.sa_family = htons(AF_UNSPEC);
       msg->rip_nets[0].rip_metric = htonl(HOPCNT_INFINITY);
       if (sendto(s, packet, sizeof (struct rip), 0,
         &router, sizeof(router)) < 0)
               perror(host);
}

/*
* Handle an incoming routing packet.
*/
rip_input(from, size)
       struct sockaddr_in *from;
       int size;
{
       register struct rip *msg = (struct rip *)packet;
       register struct netinfo *n;
       char *name;
       int lna, net, subnet;
       struct hostent *hp;
       struct netent *np;

       if (msg->rip_cmd != RIPCMD_RESPONSE)
               return;
       printf("%d bytes from ", size);
       if (nflag)
               printf("%s:\n", inet_ntoa(from->sin_addr));
       else {
               hp = gethostbyaddr(&from->sin_addr, sizeof (struct in_addr),
                       AF_INET);
               name = hp == 0 ? "???" : hp->h_name;
               printf("%s(%s):\n", name, inet_ntoa(from->sin_addr));
       }
       size -= sizeof (int);
       n = msg->rip_nets;
       while (size > 0) {
           if (size < sizeof (struct netinfo))
                   break;
           if (msg->rip_vers > 0) {
                   n->rip_dst.sa_family =
                           ntohs(n->rip_dst.sa_family);
                   n->rip_metric = ntohl(n->rip_metric);
           }
           switch (n->rip_dst.sa_family) {

           case AF_INET:
               { register struct sockaddr_in *sin;

               sin = (struct sockaddr_in *)&n->rip_dst;
               net = inet_netof(sin->sin_addr);
               subnet = inet_subnetof(sin->sin_addr);
               lna = inet_lnaof(sin->sin_addr);
               name = "???";
               if (!nflag) {
                       if (sin->sin_addr.s_addr == 0)
                               name = "default";
                       else if (lna == INADDR_ANY) {
                               np = getnetbyaddr(net, AF_INET);
                               if (np)
                                       name = np->n_name;
                               else if (net == 0)
                                       name = "default";
                       } else if ((lna & 0xff) == 0 &&
                           (np = getnetbyaddr(subnet, AF_INET))) {
                               struct in_addr subnaddr, inet_makeaddr();

                               subnaddr = inet_makeaddr(subnet, INADDR_ANY);
                               if (bcmp(&sin->sin_addr, &subnaddr,
                                   sizeof(subnaddr)) == 0)
                                       name = np->n_name;
                               else
                                       goto host;
                       } else {
       host:
                               hp = gethostbyaddr(&sin->sin_addr,
                                   sizeof (struct in_addr), AF_INET);
                               if (hp)
                                       name = hp->h_name;
                       }
                       printf("\t%-17s metric %2d name %s\n",
                               inet_ntoa(sin->sin_addr), n->rip_metric, name);
               } else
                       printf("\t%-17s metric %2d\n",
                               inet_ntoa(sin->sin_addr), n->rip_metric);
               break;
               }

           default:
               { u_short *p = (u_short *)n->rip_dst.sa_data;

               printf("\t(af %d) %x %x %x %x %x %x %x, metric %d\n",
                   p[0], p[1], p[2], p[3], p[4], p[5], p[6],
                   n->rip_dst.sa_family,
                   n->rip_metric);
               break;
               }
                       
           }
           size -= sizeof (struct netinfo), n++;
       }
}

timeout()
{
       timedout = 1;
}

/*
* Return the possible subnetwork number from an internet address.
* SHOULD FIND OUT WHETHER THIS IS A LOCAL NETWORK BEFORE LOOKING
* INSIDE OF THE HOST PART.  We can only believe this if we have other
* information (e.g., we can find a name for this number).
*/
inet_subnetof(in)
       struct in_addr in;
{
       register u_long i = ntohl(in.s_addr);

       if (IN_CLASSA(i))
               return ((i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
       else if (IN_CLASSB(i))
               return ((i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
       else
               return ((i & 0xffffffc0) >> 28);
}