/* host - print information about a host
* originally written by Paul Vixie @DEC WRL, January 1989
*/
/* DECWRL Header: host.c,v 1.1 89/04/05 15:41:12 vixie Locked $ */
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <stdio.h>
#include <resolv.h>
#include <netdb.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#ifndef LOG_PERROR
#define LOG_PERROR 0
#endif
int main(int argc, char **argv)
{
unsigned char b_addr[IN6ADDRSZ];
struct hostent *host;
char **ap, **cp, *arg;
const char *prog = "amnesia";
int af = AF_INET;
int size = INADDRSZ;
int force = 0;
if (argc < 1) {
usage:
printf("usage: %s [-d] [-6] [-f] (hostname|ipaddr)\n", prog);
exit(1);
}
prog = *argv++;
argc--;
#ifdef LOG_USER
openlog(prog, LOG_PERROR, LOG_USER);
#else
openlog(prog, LOG_PERROR);
#endif
res_init();
if (argc >= 1 && !strcmp(*argv, "-d")) {
_res.options |= RES_DEBUG;
argv++, argc--;
}
if (argc >= 1 && !strcmp(*argv, "-6")) {
af = AF_INET6, size = IN6ADDRSZ;
_res.options |= RES_USE_INET6;
argv++, argc--;
}
if (argc >= 1 && !strcmp(*argv, "-f")) {
force++;
argv++, argc--;
}
if (argc < 1)
goto usage;
arg = *argv++;
argc--;
if (inet_pton(af, arg, b_addr)) {
char p[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
printf("[%s]\n", inet_ntop(af, b_addr, p, sizeof p));
if (!(host = gethostbyaddr((char *)b_addr, size, af))) {
herror("gethostbyaddr");
exit(1);
}
} else {
printf("{%s}\n", arg);
if (force)
host = gethostbyname2(arg, af);
else
host = gethostbyname(arg);
if (!host) {
herror("gethostbyname*");
exit(1);
}
}
printf("name: %s\n", host->h_name);
if (host->h_aliases && *host->h_aliases) {
printf("aliases:");
for (cp = (char **)host->h_aliases; *cp; cp++)
printf(" %s", *cp);
printf("\n");
}
if (host->h_addr_list && *host->h_addr_list) {
printf("addresses:");
for (ap = host->h_addr_list; *ap; ap++) {
char p[sizeof
"ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
printf(" %s", inet_ntop(host->h_addrtype,
*ap, p, sizeof p));
}
printf("\n");
}
exit(0);
}