minix/bin/hostname/hostname.c

210 lines
5.5 KiB
C
Raw Normal View History

/* $NetBSD: hostname.c,v 1.20 2013/07/19 15:53:00 christos Exp $ */
/*
* Copyright (c) 1988, 1993
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: hostname.c,v 1.20 2013/07/19 15:53:00 christos Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <err.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
__dead static void usage(void);
int
main(int argc, char *argv[])
{
int ch, Aflag, aflag, dflag, Iflag, iflag, fflag, sflag, i;
char *p, hostname[MAXHOSTNAMELEN + 1];
struct addrinfo hints, *ainfos, *ai;
struct hostent *hent;
struct ifaddrs *ifa, *ifp;
struct sockaddr_in6 *sin6;
char buf[MAX(MAXHOSTNAMELEN + 1, INET6_ADDRSTRLEN)];
setprogname(argv[0]);
Aflag = aflag = dflag = Iflag = iflag = fflag = sflag = 0;
while ((ch = getopt(argc, argv, "AadIifs")) != -1)
switch (ch) {
case 'A':
Aflag = 1;
break;
case 'a':
aflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'I':
Iflag = 1;
break;
case 'i':
iflag = 1;
break;
case 'f':
fflag = 1;
break;
case 's':
sflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc > 1)
usage();
if (*argv) {
if (sethostname(*argv, strlen(*argv)))
err(1, "sethostname");
} else if (Aflag || Iflag) {
if (getifaddrs(&ifa) == -1)
err(1, "getifaddrs");
for (ifp = ifa; ifp; ifp = ifp->ifa_next) {
if (ifp->ifa_addr == NULL ||
#if !defined(__minix)
ifp->ifa_flags & IFF_LOOPBACK ||
#endif
!(ifp->ifa_flags & IFF_UP))
continue;
switch(ifp->ifa_addr->sa_family) {
case AF_INET:
break;
case AF_INET6:
/* Skip link local addresses */
sin6 = (struct sockaddr_in6 *)ifp->ifa_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr))
continue;
break;
default:
/* We only translate IPv4 or IPv6 addresses */
continue;
}
i = getnameinfo(ifp->ifa_addr, ifp->ifa_addr->sa_len,
buf, sizeof(buf), NULL, 0,
Iflag ? NI_NUMERICHOST: NI_NAMEREQD);
if (i) {
if (Iflag && i != EAI_NONAME)
errx(1, "getnameinfo: %s",
gai_strerror(i));
} else
printf("%s\n", buf);
}
freeifaddrs(ifa);
} else {
if (gethostname(hostname, sizeof(hostname)))
err(1, "gethostname");
hostname[sizeof(hostname) - 1] = '\0';
if (aflag) {
if ((hent = gethostbyname(hostname)) == NULL)
errx(1, "gethostbyname: %s",
hstrerror(h_errno));
for (i = 0; hent->h_aliases[i]; i++)
printf("%s\n", hent->h_aliases[i]);
} else if (dflag || iflag || fflag) {
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_CANONNAME;
i = getaddrinfo(hostname, NULL, &hints, &ainfos);
if (i)
errx(1, "getaddrinfo: %s", gai_strerror(i));
if (ainfos) {
if (dflag) {
if ((p = strchr(ainfos->ai_canonname,
'.')))
printf("%s\n", p + 1);
} else if (iflag) {
for (ai = ainfos; ai; ai = ai->ai_next)
{
i = getnameinfo(ai->ai_addr,
ai->ai_addrlen,
buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST);
if (i)
errx(1,
"getnameinfo: %s",
gai_strerror(i));
printf("%s\n", buf);
}
} else {
if (sflag &&
(p = strchr(ainfos->ai_canonname,
'.')))
*p = '\0';
printf("%s\n", ainfos->ai_canonname);
}
freeaddrinfo(ainfos);
}
} else {
if (sflag && (p = strchr(hostname, '.')))
*p = '\0';
printf("%s\n", hostname);
}
}
exit(0);
/* NOTREACHED */
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: %s [-AadfIis] [name-of-host]\n",
getprogname());
exit(1);
/* NOTREACHED */
}