usr/src/sbin/routed/query/query.c

/*-
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1982, 1986 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)query.c     5.13 (Berkeley) 4/16/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <signal.h>
#include <netinet/in.h>
#include <protocols/routed.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

int     s;
int     timedout;
void    timeout();
char    packet[MAXPACKETSIZE];
int     nflag;

main(argc, argv)
        int argc;
        char *argv[];
{
        extern char *optarg;
        extern int optind;
        int ch, cc, count, bits;
        struct sockaddr from;
        int fromlen = sizeof(from), size = 32*1024;
        struct timeval shorttime;

        while ((ch = getopt(argc, argv, "n")) != EOF)
                switch((char)ch) {
                case 'n':
                        nflag++;
                        break;
                case '?':
                default:
                        goto usage;
                }
        argv += optind;

        if (!*argv) {
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");

        while (*argv) {
                query(*argv++);
                count++;
        }

        /*
         * 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, (fd_set *)&bits, NULL, NULL, &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 == NULL) {
                        fprintf(stderr, "query: %s: ", host);
                        herror((char *)NULL);
                        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,
          (struct sockaddr *)&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((char *)&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((char *)&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++;
        }
}

void
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);
}