4.3BSD-Reno/src/sbin/routed/query/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 the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#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 5.11 (Berkeley) 10/10/88";
#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[];
{
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, &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 == 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,
&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);
}