several tcp apps IPv6 update

 -inetd
 -rshd
 -rlogind
 -telnetd
 -rsh
 -rlogin

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project

9 files changed, 192 insertions, 76 deletions

diff --git a/libexec/rlogind/Makefile b/libexec/rlogind/Makefile
index bae4a4b..f22df18 100644
--- a/libexec/rlogind/Makefile
+++ b/libexec/rlogind/Makefile
@@ -6,7 +6,7 @@ SRCS=	rlogind.c
 MAN8=	rlogind.8
 DPADD=	${LIBUTIL}
 LDADD=	-lutil
-CFLAGS+= -Wall
+CFLAGS+= -Wall -DINET6
 
 .if defined(NOPAM)
 CFLAGS+= -DNO_PAM
diff --git a/libexec/rlogind/rlogind.8 b/libexec/rlogind/rlogind.8
index 14d7a93..969fb08 100644
--- a/libexec/rlogind/rlogind.8
+++ b/libexec/rlogind/rlogind.8
@@ -204,3 +204,5 @@ The
 .Nm
 command appeared in
 .Bx 4.2 .
+.Pp
+IPv6 support was added by WIDE/KAME project.
\ No newline at end of file
diff --git a/libexec/rlogind/rlogind.c b/libexec/rlogind/rlogind.c
index 111a56b..817f6c8 100644
--- a/libexec/rlogind/rlogind.c
+++ b/libexec/rlogind/rlogind.c
@@ -91,6 +91,11 @@ static const char rcsid[] =
 
 #define		ARGSTR			"Dalnx"
 
+/* wrapper for KAME-special getnameinfo() */
+#ifndef NI_WITHSCOPEID
+#define	NI_WITHSCOPEID	0
+#endif
+
 char	*env[2];
 #define	NMAX 30
 char	lusername[NMAX+1], rusername[NMAX+1];
@@ -102,12 +107,25 @@ int	no_delay;
 
 struct	passwd *pwd;
 
-void	doit __P((int, struct sockaddr_in *));
+union sockunion {
+	struct sockinet {
+		u_char si_len;
+		u_char si_family;
+		u_short si_port;
+	} su_si;
+	struct sockaddr_in  su_sin;
+	struct sockaddr_in6 su_sin6;
+};
+#define su_len		su_si.si_len
+#define su_family	su_si.si_family
+#define su_port		su_si.si_port
+
+void	doit __P((int, union sockunion *));
 int	control __P((int, char *, int));
 void	protocol __P((int, int));
 void	cleanup __P((int));
 void	fatal __P((int, char *, int));
-int	do_rlogin __P((struct sockaddr_in *));
+int	do_rlogin __P((union sockunion *));
 void	getstr __P((char *, int, char *));
 void	setup_term __P((int));
 int	do_krb_login __P((struct sockaddr_in *));
@@ -123,7 +141,7 @@ main(argc, argv)
 	char *argv[];
 {
 	extern int __check_rhosts_file;
-	struct sockaddr_in from;
+	union sockunion from;
 	int ch, fromlen, on;
 
 	openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH);
@@ -168,9 +186,12 @@ main(argc, argv)
 	if (no_delay &&
 	    setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 		syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m");
+        if (from.su_family == AF_INET)
+      {
 	on = IPTOS_LOWDELAY;
 	if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
 		syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
+      }
 
 	doit(0, &from);
 	return 0;
@@ -187,11 +208,12 @@ struct winsize win = { 0, 0, 0, 0 };
 void
 doit(f, fromp)
 	int f;
-	struct sockaddr_in *fromp;
+	union sockunion *fromp;
 {
 	int master, pid, on = 1;
 	int authenticated = 0;
-	char hostname[MAXHOSTNAMELEN];
+	char hostname[2 * MAXHOSTNAMELEN + 1];
+	char nameinfo[2 * INET6_ADDRSTRLEN + 1];
 	char c;
 
 	alarm(60);
@@ -201,20 +223,33 @@ doit(f, fromp)
 		exit(1);
 
 	alarm(0);
-	fromp->sin_port = ntohs((u_short)fromp->sin_port);
-	realhostname(hostname, sizeof(hostname) - 1, &fromp->sin_addr);
+
+	realhostname_sa(hostname, sizeof(hostname) - 1,
+			    (struct sockaddr *)fromp, fromp->su_len);
+	/* error check ? */
+	fromp->su_port = ntohs((u_short)fromp->su_port);
 	hostname[sizeof(hostname) - 1] = '\0';
 
 	{
-		if (fromp->sin_family != AF_INET ||
-		    fromp->sin_port >= IPPORT_RESERVED ||
-		    fromp->sin_port < IPPORT_RESERVED/2) {
+		if ((fromp->su_family != AF_INET &&
+#ifdef INET6
+		     fromp->su_family != AF_INET6
+#endif
+		     ) ||
+		    fromp->su_port >= IPPORT_RESERVED ||
+		    fromp->su_port < IPPORT_RESERVED/2) {
+			getnameinfo((struct sockaddr *)fromp,
+				    fromp->su_len,
+				    nameinfo, sizeof(nameinfo), NULL, 0,
+				    NI_NUMERICHOST|NI_WITHSCOPEID);
+			/* error check ? */
 			syslog(LOG_NOTICE, "Connection from %s on illegal port",
-				inet_ntoa(fromp->sin_addr));
+			       nameinfo);
 			fatal(f, "Permission denied", 0);
 		}
 #ifdef IP_OPTIONS
-		{
+		if (fromp->su_family == AF_INET)
+              {
 		u_char optbuf[BUFSIZ/3];
 		int optsize = sizeof(optbuf), ipproto, i;
 		struct protoent *ip;
@@ -230,7 +265,7 @@ doit(f, fromp)
 				if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
 					syslog(LOG_NOTICE,
 						"Connection refused from %s with IP option %s",
-						inet_ntoa(fromp->sin_addr),
+						inet_ntoa(fromp->su_sin.sin_addr),
 						c == IPOPT_LSRR ? "LSRR" : "SSRR");
 					exit(1);
 				}
@@ -239,7 +274,7 @@ doit(f, fromp)
 				i += (c == IPOPT_NOP) ? 1 : optbuf[i+1];
 			}
 		}
-		}
+	      }
 #endif
 		if (do_rlogin(fromp) == 0)
 			authenticated++;
@@ -533,9 +568,11 @@ fatal(f, msg, syserr)
 
 int
 do_rlogin(dest)
-	struct sockaddr_in *dest;
+	union sockunion *dest;
 {
 	int retval;
+	int af;
+	char *addr;
 
 	getstr(rusername, sizeof(rusername), "remuser too long");
 	getstr(lusername, sizeof(lusername), "locuser too long");
@@ -559,8 +596,22 @@ do_rlogin(dest)
 	if (pwd == NULL)
 		return (-1);
 	/* XXX why don't we syslog() failure? */
-	return (iruserok(dest->sin_addr.s_addr, pwd->pw_uid == 0,
-		rusername, lusername));
+
+	af = dest->su_family;
+	switch (af) {
+	case AF_INET:
+		addr = (char *)&dest->su_sin.sin_addr;
+		break;
+#ifdef INET6
+	case AF_INET6:
+		addr = (char *)&dest->su_sin6.sin6_addr;
+		break;
+#endif
+	default:
+		return -1;	/*EAFNOSUPPORT*/
+	}
+	
+	return (iruserok_af(addr, pwd->pw_uid == 0, rusername, lusername, af));
 }
 
 void
diff --git a/libexec/rshd/Makefile b/libexec/rshd/Makefile
index 2005122..ca0d155 100644
--- a/libexec/rshd/Makefile
+++ b/libexec/rshd/Makefile
@@ -19,6 +19,9 @@ CFLAGS+=-DLOGIN_CAP -Wall
 DPADD+=	${LIBUTIL}
 LDADD+= -lutil
 
+# IPv6 support
+CFLAGS+= -DINET6
+
 .include <bsd.prog.mk>
 
 .PATH:	${.CURDIR}/../rlogind
diff --git a/libexec/rshd/rshd.8 b/libexec/rshd/rshd.8
index 80cdbc1..cba4482 100644
--- a/libexec/rshd/rshd.8
+++ b/libexec/rshd/rshd.8
@@ -250,3 +250,5 @@ A facility to allow all data exchanges to be encrypted should be
 present.
 .Pp
 A more extensible protocol (such as Telnet) should be used.
+.Sh HISTORY
+IPv6 support was added by WIDE/KAME project.
diff --git a/libexec/rshd/rshd.c b/libexec/rshd/rshd.c
index 8533644..54fa4a6 100644
--- a/libexec/rshd/rshd.c
+++ b/libexec/rshd/rshd.c
@@ -80,6 +80,11 @@ static const char rcsid[] =
 #include <login_cap.h>
 #endif
 
+/* wrapper for KAME-special getnameinfo() */
+#ifndef NI_WITHSCOPEID
+#define	NI_WITHSCOPEID	0
+#endif
+
 int	keepalive = 1;
 int	log_success;		/* If TRUE, log all successful accesses */
 int	sent_null;
@@ -88,7 +93,20 @@ int	no_delay;
 int	doencrypt = 0;
 #endif
 
-void	 doit __P((struct sockaddr_in *));
+union sockunion {
+	struct sockinet {
+		u_char si_len;
+		u_char si_family;
+		u_short si_port;
+	} su_si;
+	struct sockaddr_in  su_sin;
+	struct sockaddr_in6 su_sin6;
+};
+#define su_len		su_si.si_len
+#define su_family	su_si.si_family
+#define su_port		su_si.si_port
+
+void	 doit __P((union sockunion *));
 void	 error __P((const char *, ...));
 void	 getstr __P((char *, int, char *));
 int	 local_domain __P((char *));
@@ -109,7 +127,7 @@ main(argc, argv)
 	extern int __check_rhosts_file;
 	struct linger linger;
 	int ch, on = 1, fromlen;
-	struct sockaddr_in from;
+	struct sockaddr_storage from;
 
 	openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
 
@@ -169,7 +187,7 @@ main(argc, argv)
 	if (no_delay &&
 	    setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 		syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m");
-	doit(&from);
+	doit((union sockunion *)&from);
 	/* NOTREACHED */
 	return(0);
 }
@@ -184,7 +202,7 @@ char	**environ;
 
 void
 doit(fromp)
-	struct sockaddr_in *fromp;
+	union sockunion *fromp;
 {
 	extern char *__rcmd_errstr;	/* syslog hook from libc/net/rcmd.c. */
 	struct passwd *pwd;
@@ -195,7 +213,9 @@ doit(fromp)
 	char *errorstr;
 	char *cp, sig, buf[BUFSIZ];
 	char cmdbuf[NCARGS+1], locuser[16], remuser[16];
-	char fromhost[MAXHOSTNAMELEN];
+	char fromhost[2 * MAXHOSTNAMELEN + 1];
+	char numericname[INET6_ADDRSTRLEN];
+	int af = fromp->su_family, err;
 	int retval;
 #ifdef	CRYPT
 	int rc;
@@ -216,14 +236,21 @@ doit(fromp)
 	  }
 	}
 #endif
-	fromp->sin_port = ntohs((u_short)fromp->sin_port);
-	if (fromp->sin_family != AF_INET) {
-		syslog(LOG_ERR, "malformed \"from\" address (af %d)",
-		    fromp->sin_family);
+	fromp->su_port = ntohs((u_short)fromp->su_port);
+	if (af != AF_INET
+#ifdef INET6
+	    && af != AF_INET6
+#endif
+	    ) {
+		syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af);
 		exit(1);
 	}
+	err = getnameinfo((struct sockaddr *)fromp, fromp->su_len, numericname,
+			  sizeof(numericname), NULL, 0,
+			  NI_NUMERICHOST|NI_WITHSCOPEID);
+	/* XXX: do 'err' check */
 #ifdef IP_OPTIONS
-      {
+      if (af == AF_INET) {
 	u_char optbuf[BUFSIZ/3];
 	int optsize = sizeof(optbuf), ipproto, i;
 	struct protoent *ip;
@@ -239,7 +266,7 @@ doit(fromp)
 			if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
 				syslog(LOG_NOTICE,
 					"connection refused from %s with IP option %s",
-					inet_ntoa(fromp->sin_addr),
+					numericname,
 					c == IPOPT_LSRR ? "LSRR" : "SSRR");
 				exit(1);
 			}
@@ -251,12 +278,12 @@ doit(fromp)
       }
 #endif
 
-	if (fromp->sin_port >= IPPORT_RESERVED ||
-	    fromp->sin_port < IPPORT_RESERVED/2) {
+	if (fromp->su_port >= IPPORT_RESERVED ||
+	    fromp->su_port < IPPORT_RESERVED/2) {
 		syslog(LOG_NOTICE|LOG_AUTH,
 		    "connection from %s on illegal port %u",
-		    inet_ntoa(fromp->sin_addr),
-		    fromp->sin_port);
+		    numericname,
+		    fromp->su_port);
 		exit(1);
 	}
 
@@ -279,7 +306,7 @@ doit(fromp)
 	(void) alarm(0);
 	if (port != 0) {
 		int lport = IPPORT_RESERVED - 1;
-		s = rresvport(&lport);
+		s = rresvport_af(&lport, af);
 		if (s < 0) {
 			syslog(LOG_ERR, "can't get stderr port: %m");
 			exit(1);
@@ -288,11 +315,11 @@ doit(fromp)
 		    port < IPPORT_RESERVED/2) {
 			syslog(LOG_NOTICE|LOG_AUTH,
 			    "2nd socket from %s on unreserved port %u",
-			    inet_ntoa(fromp->sin_addr),
+			    numericname,
 			    port);
 			exit(1);
 		}
-		fromp->sin_port = htons(port);
+		fromp->su_port = htons(port);
 		if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0) {
 			syslog(LOG_INFO, "connect second port %d: %m", port);
 			exit(1);
@@ -300,11 +327,13 @@ doit(fromp)
 	}
 
 	errorstr = NULL;
-	realhostname(fromhost, sizeof(fromhost) - 1, &fromp->sin_addr);
+	realhostname_sa(fromhost, sizeof(fromhost) - 1,
+			(struct sockaddr *)fromp,
+			fromp->su_len);
 	fromhost[sizeof(fromhost) - 1] = '\0';
 
 #ifdef CRYPT
-	if (doencrypt) {
+	if (doencrypt && af == AF_INET) {
 		struct sockaddr_in local_addr;
 		rc = sizeof(local_addr);
 		if (getsockname(0, (struct sockaddr *)&local_addr,
@@ -379,8 +408,14 @@ doit(fromp)
 		if (errorstr ||
 		    (pwd->pw_expire && time(NULL) >= pwd->pw_expire) ||
 		    (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
-		    iruserok(fromp->sin_addr.s_addr, pwd->pw_uid == 0,
-		    remuser, locuser) < 0)) {
+		    iruserok_af(
+#ifdef INET6
+				(af == AF_INET6)
+				? (void *)&fromp->su_sin6.sin6_addr :
+#endif
+				(void *)&fromp->su_sin.sin_addr,
+				pwd->pw_uid == 0,
+		    remuser, locuser, af) < 0)) {
 			if (__rcmd_errstr)
 				syslog(LOG_INFO|LOG_AUTH,
 			    "%s@%s as %s: permission denied (%s). cmd='%.80s'",
@@ -402,10 +437,10 @@ fail:
 		exit(1);
 	}
 #ifdef	LOGIN_CAP
-	if (lc != NULL) {
+	if (lc != NULL && fromp->su_family == AF_INET) {	/*XXX*/
 		char	remote_ip[MAXHOSTNAMELEN];
 
-		strncpy(remote_ip, inet_ntoa(fromp->sin_addr),
+		strncpy(remote_ip, numericname,
 			sizeof(remote_ip) - 1);
 		remote_ip[sizeof(remote_ip) - 1] = 0;
 		if (!auth_hostok(lc, fromhost, remote_ip)) {
diff --git a/libexec/telnetd/Makefile b/libexec/telnetd/Makefile
index 068087a..7766276 100644
--- a/libexec/telnetd/Makefile
+++ b/libexec/telnetd/Makefile
@@ -6,6 +6,7 @@ CFLAGS+=-DLINEMODE -DUSE_TERMIO -DDIAGNOSTICS
 #CFLAGS+=-DKLUDGELINEMODE
 CFLAGS+=-DOLD_ENVIRON -DENV_HACK
 CFLAGS+=-I${.CURDIR}/../../lib
+CFLAGS+=-DINET6
 SRCS=	global.c slc.c state.c sys_term.c telnetd.c \
 	termstat.c utility.c
 DPADD=	${LIBUTIL} ${LIBTERMCAP} ${LIBTELNET}
diff --git a/libexec/telnetd/telnetd.8 b/libexec/telnetd/telnetd.8
index a2973ef..06e98f9 100644
--- a/libexec/telnetd/telnetd.8
+++ b/libexec/telnetd/telnetd.8
@@ -623,3 +623,5 @@ never sends
 .Tn TELNET
 .Dv IAC GA
 (go ahead) commands.
+.Sh HISTORY
+IPv6 support was added by WIDE/KAME project.
\ No newline at end of file
diff --git a/libexec/telnetd/telnetd.c b/libexec/telnetd/telnetd.c
index 5141c2a..57a972a 100644
--- a/libexec/telnetd/telnetd.c
+++ b/libexec/telnetd/telnetd.c
@@ -71,6 +71,12 @@ static const char rcsid[] =
 #include <sys/secparm.h>
 #include <sys/usrv.h>
 # endif /* SO_SEC_MULTI */
+
+/* wrapper for KAME-special getnameinfo() */
+#ifndef NI_WITHSCOPEID
+#define	NI_WITHSCOPEID	0
+#endif
+
 int	secflag;
 char	tty_dev[16];
 struct	secdev dv;
@@ -137,7 +143,7 @@ int debug = 0;
 int keepalive = 1;
 char *altlogin;
 
-void doit __P((struct sockaddr_in *));
+void doit __P((struct sockaddr *));
 int terminaltypeok __P((char *));
 void startslave __P((char *, int, char *));
 extern void usage P((void));
@@ -149,6 +155,7 @@ extern void usage P((void));
  */
 char valid_opts[] = {
 	'd', ':', 'h', 'k', 'n', 'p', ':', 'S', ':', 'u', ':', 'U',
+	'4', '6',
 #ifdef	AUTHENTICATION
 	'a', ':', 'X', ':',
 #endif
@@ -173,11 +180,13 @@ char valid_opts[] = {
 	'\0'
 };
 
-	int
+int family = AF_INET;
+
+int
 main(argc, argv)
 	char *argv[];
 {
-	struct sockaddr_in from;
+	struct sockaddr_storage from;
 	int on = 1, fromlen;
 	register int ch;
 #if	defined(IPPROTO_IP) && defined(IP_TOS)
@@ -381,6 +390,16 @@ main(argc, argv)
 			break;
 #endif	/* AUTHENTICATION */
 
+		case '4':
+			family = AF_INET;
+			break;
+
+#ifdef INET6
+		case '6':
+			family = AF_INET6;
+			break;
+#endif
+
 		default:
 			warnx("%c: unknown option", ch);
 			/* FALLTHROUGH */
@@ -394,43 +413,41 @@ main(argc, argv)
 	argv += optind;
 
 	if (debug) {
-	    int s, ns, foo;
-	    struct servent *sp;
-	    static struct sockaddr_in sin = { AF_INET };
+	    int s, ns, foo, error;
+	    char *service = "telnet";
+	    struct addrinfo hints, *res;
 
 	    if (argc > 1) {
 		usage();
 		/* NOT REACHED */
-	    } else if (argc == 1) {
-		    if ((sp = getservbyname(*argv, "tcp"))) {
-			sin.sin_port = sp->s_port;
-		    } else {
-			sin.sin_port = atoi(*argv);
-			if ((int)sin.sin_port <= 0) {
-			    warnx("%s: bad port #", *argv);
-			    usage();
-			    /* NOT REACHED */
-			}
-			sin.sin_port = htons((u_short)sin.sin_port);
-		   }
-	    } else {
-		sp = getservbyname("telnet", "tcp");
-		if (sp == 0)
-		    errx(1, "tcp/telnet: unknown service");
-		sin.sin_port = sp->s_port;
+	    } else if (argc == 1)
+		service = *argv;
+
+	    memset(&hints, 0, sizeof(hints));
+	    hints.ai_flags = AI_PASSIVE;
+	    hints.ai_family = family;
+	    hints.ai_socktype = SOCK_STREAM;
+	    hints.ai_protocol = 0;
+	    error = getaddrinfo(NULL, service, &hints, &res);
+
+	    if (error) {
+		errx(1, "tcp/%s: %s\n", service, gai_strerror(error));
+		if (error == EAI_SYSTEM)
+		    errx(1, "tcp/%s: %s\n", service, strerror(errno));
+		usage();
 	    }
 
-	    s = socket(AF_INET, SOCK_STREAM, 0);
+	    s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 	    if (s < 0)
 		    err(1, "socket");
 	    (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 				(char *)&on, sizeof(on));
-	    if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0)
+	    if (bind(s, res->ai_addr, res->ai_addrlen) < 0)
 		err(1, "bind");
 	    if (listen(s, 1) < 0)
 		err(1, "listen");
-	    foo = sizeof sin;
-	    ns = accept(s, (struct sockaddr *)&sin, &foo);
+	    foo = res->ai_addrlen;
+	    ns = accept(s, res->ai_addr, &foo);
 	    if (ns < 0)
 		err(1, "accept");
 	    (void) dup2(ns, 0);
@@ -512,7 +529,7 @@ main(argc, argv)
 	}
 
 #if	defined(IPPROTO_IP) && defined(IP_TOS)
-	{
+	if (from.ss_family == AF_INET) {
 # if	defined(HAS_GETTOS)
 		struct tosent *tp;
 		if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
@@ -528,7 +545,7 @@ main(argc, argv)
 	}
 #endif	/* defined(IPPROTO_IP) && defined(IP_TOS) */
 	net = 0;
-	doit(&from);
+	doit((struct sockaddr *)&from);
 	/* NOTREACHED */
 	return(0);
 }  /* end of main */
@@ -773,8 +790,9 @@ char user_name[256];
  */
 	void
 doit(who)
-	struct sockaddr_in *who;
+	struct sockaddr *who;
 {
+	int err;
 	int ptynum;
 
 	/*
@@ -817,16 +835,18 @@ doit(who)
 #endif	/* _SC_CRAY_SECURE_SYS */
 
 	/* get name of connected client */
-	if (realhostname(remote_hostname, sizeof(remote_hostname) - 1,
-	    &who->sin_addr) == HOSTNAME_INVALIDADDR && registerd_host_only)
+	if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1,
+	    who, who->sa_len) == HOSTNAME_INVALIDADDR && registerd_host_only)
 		fatal(net, "Couldn't resolve your address into a host name.\r\n\
          Please contact your net administrator");
 	remote_hostname[sizeof(remote_hostname) - 1] = '\0';
 
 	trimdomain(remote_hostname, UT_HOSTSIZE);
 	if (!isdigit(remote_hostname[0]) && strlen(remote_hostname) > utmp_len)
-		strncpy(remote_hostname, inet_ntoa(who->sin_addr),
-			sizeof(remote_hostname) - 1);
+		err = getnameinfo(who, who->sa_len, remote_hostname,
+				  sizeof(remote_hostname), NULL, 0,
+				  NI_NUMERICHOST|NI_WITHSCOPEID);
+		/* XXX: do 'err' check */
 
 	(void) gethostname(host_name, sizeof(host_name) - 1);
 	host_name[sizeof(host_name) - 1] = '\0';