--- /dev/null
+.\" $NetBSD: hostname.1,v 1.19 2013/07/19 11:19:23 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 1988, 1990, 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.
+.\"
+.\" @(#)hostname.1 8.2 (Berkeley) 4/28/95
+.\"
+.Dd July 19, 2013
+.Dt HOSTNAME 1
+.Os
+.Sh NAME
+.Nm hostname
+.Nd set or print name of current host system
+.Sh SYNOPSIS
+.Nm
+.Op Fl AadfIis
+.Op Ar name-of-host
+.Sh DESCRIPTION
+.Nm
+prints the name of the current host.
+The super-user can set the host name by supplying an argument; this is
+usually done in the network initialization script
+.Pa /etc/rc.d/network ,
+normally run at boot
+time.
+.Pp
+Options:
+.Bl -tag -width flag
+.It Fl A
+Display the FQDN of each address on all interfaces.
+.It Fl a
+Display alias name(s) of the host.
+.It Fl d
+Display the DNS domain.
+.It Fl f
+Display the FQDN for the hostname.
+.It Fl I
+Display each IP address on all interfaces.
+.It Fl i
+Display the IP address(es) for the hostname.
+.It Fl s
+Display the short hostname.
+.El
+.Sh NOTES
+With the exception of
+.Fl I
+and
+.Fl s ,
+the other options will retrieve their results from the resolver.
+.Sh SEE ALSO
+.Xr domainname 1 ,
+.Xr getaddrinfo 3 ,
+.Xr gethostbyname 3 ,
+.Xr gethostname 3 ,
+.Xr getifaddrs 3 ,
+.Xr getnameinfo 3 ,
+.Xr sethostname 3 ,
+.Xr hosts 5
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Bx 4.2 .
--- /dev/null
+/* $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 */
+}