--- a/fix_options.c
+++ b/fix_options.c
@@ -11,6 +11,9 @@ static char sccsid[] = "@(#) fix_options
 
 #include <sys/types.h>
 #include <sys/param.h>
+#ifdef INET6
+#include <sys/socket.h>
+#endif
 #include <netinet/in.h>
 #include <netinet/in_systm.h>
 #include <netinet/ip.h>
@@ -41,6 +44,22 @@ struct request_info *request;
     unsigned int opt;
     int     optlen;
     struct in_addr dummy;
+#ifdef INET6
+    struct sockaddr_storage ss;
+    int sslen;
+
+    /*
+     * check if this is AF_INET socket
+     * XXX IPv6 support?
+     */
+    sslen = sizeof(ss);
+    if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
+	syslog(LOG_ERR, "getpeername: %m");
+	clean_exit(request);
+    }
+    if (ss.ss_family != AF_INET)
+	return;
+#endif
 
     if ((ip = getprotobyname("ip")) != 0)
 	ipproto = ip->p_proto;
--- a/hosts_access.5
+++ b/hosts_access.5
@@ -85,11 +85,18 @@ member of the specified netgroup. Netgro
 for daemon process names or for client user names.
 .IP \(bu
 An expression of the form `n.n.n.n/m.m.m.m\' is interpreted as a
-`net/mask\' pair. A host address is matched if `net\' is equal to the
+`net/mask\' pair. An IPv4 host address is matched if `net\' is equal to the
 bitwise AND of the address and the `mask\'. For example, the net/mask
 pattern `131.155.72.0/255.255.254.0\' matches every address in the
 range `131.155.72.0\' through `131.155.73.255\'.
 .IP \(bu
+An expression of the form `[n:n:n:n:n:n:n:n]/m\' is interpreted as a
+`[net]/prefixlen\' pair. An IPv6 host address is matched if
+`prefixlen\' bits of `net\' is equal to the `prefixlen\' bits of the
+address. For example, the [net]/prefixlen pattern
+`[3ffe:505:2:1::]/64\' matches every address in the range
+`3ffe:505:2:1::\' through `3ffe:505:2:1:ffff:ffff:ffff:ffff\'.
+.IP \(bu
 Wildcards `*\' and `?\' can be used to match hostnames or IP addresses.  This
 method of matching cannot be used in conjunction with `net/mask\' matching,
 hostname matching beginning with `.\' or IP address matching ending with `.\'.
--- a/hosts_access.c
+++ b/hosts_access.c
@@ -24,7 +24,13 @@ static char sccsid[] = "@(#) hosts_acces
 /* System libraries. */
 
 #include <sys/types.h>
+#ifdef INT32_T
+    typedef uint32_t u_int32_t;
+#endif
 #include <sys/param.h>
+#ifdef INET6
+#include <sys/socket.h>
+#endif
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdio.h>
@@ -33,6 +39,9 @@ static char sccsid[] = "@(#) hosts_acces
 #include <errno.h>
 #include <setjmp.h>
 #include <string.h>
+#ifdef INET6
+#include <netdb.h>
+#endif
 
 extern char *fgets();
 extern int errno;
@@ -83,6 +92,10 @@ static int host_match();
 static int string_match();
 static int masked_match();
 static int match_pattern_ylo();
+#ifdef INET6
+static int masked_match4();
+static int masked_match6();
+#endif
 
 /* Size of logical line buffer. */
 
@@ -290,6 +303,13 @@ char   *string;
 {
     int     n;
 
+#ifdef INET6
+    /* convert IPv4 mapped IPv6 address to IPv4 address */
+    if (STRN_EQ(string, "::ffff:", 7)
+      && dot_quad_addr(string + 7) != INADDR_NONE) {
+      string += 7;
+    }
+#endif    
 #ifndef DISABLE_WILDCARD_MATCHING
     if (strchr(tok, '*') || strchr(tok,'?')) {  /* contains '*' or '?' */
         return (match_pattern_ylo(string,tok)); 	       
@@ -305,20 +325,72 @@ char   *string;
     } else if (tok[(n = strlen(tok)) - 1] == '.') {	/* prefix */
 	return (STRN_EQ(tok, string, n));
     } else {					/* exact match */
+#ifdef INET6
+	struct addrinfo hints, *res;
+	struct sockaddr_in6 pat, addr;
+	int len, ret;
+	char ch;
+
+	len = strlen(tok);
+	if (*tok == '[' && tok[len - 1] == ']') {
+	    ch = tok[len - 1];
+	    tok[len - 1] = '\0';
+	    memset(&hints, 0, sizeof(hints));
+	    hints.ai_family = AF_INET6;
+	    hints.ai_socktype = SOCK_STREAM;
+	    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+	    if ((ret = getaddrinfo(tok + 1, NULL, &hints, &res)) == 0) {
+		memcpy(&pat, res->ai_addr, sizeof(pat));
+		freeaddrinfo(res);
+	    }
+	    tok[len - 1] = ch;
+	    if (ret != 0 || getaddrinfo(string, NULL, &hints, &res) != 0)
+		return NO;
+	    memcpy(&addr, res->ai_addr, sizeof(addr));
+	    freeaddrinfo(res);
+#ifdef NI_WITHSCOPEID
+	    if (pat.sin6_scope_id != 0 &&
+		addr.sin6_scope_id != pat.sin6_scope_id)
+		return NO;
+#endif
+	    return (!memcmp(&pat.sin6_addr, &addr.sin6_addr,
+			    sizeof(struct in6_addr)));
+	    return (ret);
+	}
+#endif
 	return (STR_EQ(tok, string));
     }
 }
 
 /* masked_match - match address against netnumber/netmask */
 
+#ifdef INET6
 static int masked_match(net_tok, mask_tok, string)
 char   *net_tok;
 char   *mask_tok;
 char   *string;
 {
+    return (masked_match4(net_tok, mask_tok, string) ||
+	    masked_match6(net_tok, mask_tok, string));
+}
+
+static int masked_match4(net_tok, mask_tok, string)
+#else
+static int masked_match(net_tok, mask_tok, string)
+#endif
+char   *net_tok;
+char   *mask_tok;
+char   *string;
+{
+#ifdef INET6
+    u_int32_t net;
+    u_int32_t mask;
+    u_int32_t addr;
+#else
     unsigned long net;
     unsigned long mask;
     unsigned long addr;
+#endif
 
     /*
      * Disallow forms other than dotted quad: the treatment that inet_addr()
@@ -330,12 +402,78 @@ char   *string;
 	return (NO);
     if ((net = dot_quad_addr(net_tok)) == INADDR_NONE
 	|| (mask = dot_quad_addr(mask_tok)) == INADDR_NONE) {
+#ifndef INET6
 	tcpd_warn("bad net/mask expression: %s/%s", net_tok, mask_tok);
+#endif
 	return (NO);				/* not tcpd_jump() */
     }
     return ((addr & mask) == net);
 }
 
+#ifdef INET6
+static int masked_match6(net_tok, mask_tok, string)
+char   *net_tok;
+char   *mask_tok;
+char   *string;
+{
+    struct addrinfo hints, *res;
+    struct sockaddr_in6 net, addr;
+    u_int32_t mask;
+    int len, mask_len, i = 0;
+    char ch;
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET6;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+    if (getaddrinfo(string, NULL, &hints, &res) != 0)
+	return NO;
+    memcpy(&addr, res->ai_addr, sizeof(addr));
+    freeaddrinfo(res);
+
+    if (IN6_IS_ADDR_V4MAPPED(&addr.sin6_addr)) {
+	if ((*(u_int32_t *)&net.sin6_addr.s6_addr[12] = dot_quad_addr(net_tok)) == INADDR_NONE
+	 || (mask = dot_quad_addr(mask_tok)) == INADDR_NONE)
+	    return (NO);
+	return ((*(u_int32_t *)&addr.sin6_addr.s6_addr[12] & mask) == *(u_int32_t *)&net.sin6_addr.s6_addr[12]);
+    }
+
+    /* match IPv6 address against netnumber/prefixlen */
+    len = strlen(net_tok);
+    if (*net_tok != '[' || net_tok[len - 1] != ']')
+	return NO;
+    ch = net_tok[len - 1];
+    net_tok[len - 1] = '\0';
+    if (getaddrinfo(net_tok + 1, NULL, &hints, &res) != 0) {
+	net_tok[len - 1] = ch;
+	return NO;
+    }
+    memcpy(&net, res->ai_addr, sizeof(net));
+    freeaddrinfo(res);
+    net_tok[len - 1] = ch;
+    if ((mask_len = atoi(mask_tok)) < 0 || mask_len > 128)
+	return NO;
+
+#ifdef NI_WITHSCOPEID
+    if (net.sin6_scope_id != 0 && addr.sin6_scope_id != net.sin6_scope_id)
+	return NO;
+#endif
+    while (mask_len > 0) {
+	if (mask_len < 32) {
+	    mask = htonl(~(0xffffffff >> mask_len));
+	    if ((*(u_int32_t *)&addr.sin6_addr.s6_addr[i] & mask) != (*(u_int32_t *)&net.sin6_addr.s6_addr[i] & mask))
+		return NO;
+	    break;
+	}
+	if (*(u_int32_t *)&addr.sin6_addr.s6_addr[i] != *(u_int32_t *)&net.sin6_addr.s6_addr[i])
+	    return NO;
+	i += 4;
+	mask_len -= 32;
+    }
+    return YES;
+}
+#endif /* INET6 */
+
 #ifndef DISABLE_WILDCARD_MATCHING
 /* Note: this feature has been adapted in a pretty straightforward way
    from Tatu Ylonen's last SSH version under free license by 
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ what:
 	@echo "	dynix epix esix freebsd hpux irix4 irix5 irix6 isc iunix"
 	@echo "	linux machten mips(untested) ncrsvr4 netbsd next osf power_unix_211"
 	@echo "	ptx-2.x ptx-generic pyramid sco sco-nis sco-od2 sco-os5 sinix sunos4"
-	@echo "	sunos40 sunos5 sysv4 tandem ultrix unicos7 unicos8 unixware1 unixware2"
+	@echo "	sunos40 sunos5 solaris8 sysv4 tandem ultrix unicos7 unicos8 unixware1 unixware2"
 	@echo "	uts215 uxp"
 	@echo
 	@echo "If none of these match your environment, edit the system"
@@ -131,20 +131,34 @@ epix:
 	NETGROUP=-DNETGROUP TLI= SYSTYPE="-systype bsd43" all
 
 # Freebsd and linux by default have no NIS.
-386bsd netbsd bsdos:
+386bsd bsdos:
 	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
 	LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= NETGROUP= TLI= \
 	EXTRA_CFLAGS=-DSYS_ERRLIST_DEFINED VSYSLOG= all
 
 freebsd:
 	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+	LIBS="-L/usr/local/v6/lib -linet6" \
 	LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= NETGROUP= TLI= \
-	EXTRA_CFLAGS=-DSYS_ERRLIST_DEFINED VSYSLOG= all
+	EXTRA_CFLAGS="-DSYS_ERRLIST_DEFINED -DINET6 -Dss_family=__ss_family -Dss_len=__ss_len" \
+	VSYSLOG= all
+
+netbsd:
+	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+	LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= NETGROUP= TLI= \
+	EXTRA_CFLAGS="-DSYS_ERRLIST_DEFINED -DINET6 -Dss_family=__ss_family -Dss_len=__ss_len" VSYSLOG= all
 
 linux:
 	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
-	LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
-	NETGROUP= TLI= EXTRA_CFLAGS="-DBROKEN_SO_LINGER" all
+	LIBS=-lnsl RANLIB=ranlib ARFLAGS=rv AUX_OBJ= \
+	NETGROUP="-DNETGROUP" TLI= VSYSLOG= BUGS= \
+	EXTRA_CFLAGS="-DSYS_ERRLIST_DEFINED -DHAVE_STRERROR -DINET6=1 -Dss_family=__ss_family -Dss_len=__ss_len" all
+
+gnu:
+	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+	LIBS=-lnsl RANLIB=ranlib ARFLAGS=rv AUX_OBJ= \
+	NETGROUP=-DNETGROUP TLI= VSYSLOG= BUGS= \
+	EXTRA_CFLAGS="-DSYS_ERRLIST_DEFINED -DHAVE_STRERROR" all
 
 # This is good for many SYSV+BSD hybrids with NIS, probably also for HP-UX 7.x.
 hpux hpux8 hpux9 hpux10:
@@ -196,6 +210,13 @@ sunos5:
 	NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI \
 	BUGS="$(BUGS) -DSOLARIS_24_GETHOSTBYNAME_BUG" all
 
+# SunOS 5.8 is another SYSV4 variant, but has IPv6 support
+solaris8:
+	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+	LIBS="-lsocket -lnsl" RANLIB=echo ARFLAGS=rv VSYSLOG= \
+	NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI \
+	EXTRA_CFLAGS="-DINET6 -DNO_CLONE_DEVICE -DINT32_T" all
+
 # Generic SYSV40
 esix sysv4:
 	@make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
--- a/misc.c
+++ b/misc.c
@@ -58,9 +58,31 @@ int     delimiter;
 {
     char   *cp;
 
+#ifdef INET6
+    int bracket = 0;
+
+    for (cp = string; cp && *cp; cp++) {
+	switch (*cp) {
+	case '[':
+	    bracket++;
+	    break;
+	case ']':
+	    bracket--;
+	    break;
+	default:
+	    if (bracket == 0 && *cp == delimiter) {
+		*cp++ = 0;
+		return cp;
+	    }
+	    break;
+	}
+    }
+    return (NULL);
+#else
     if ((cp = strchr(string, delimiter)) != 0)
 	*cp++ = 0;
     return (cp);
+#endif
 }
 
 /* dot_quad_addr - convert dotted quad to internal form */
--- a/refuse.c
+++ b/refuse.c
@@ -25,7 +25,12 @@ static char sccsid[] = "@(#) refuse.c 1.
 void    refuse(request)
 struct request_info *request;
 {
+#ifdef INET6
+    syslog(deny_severity, "refused connect from %s (%s)",
+	   eval_client(request), eval_hostaddr(request->client));
+#else
     syslog(deny_severity, "refused connect from %s", eval_client(request));
+#endif
     clean_exit(request);
     /* NOTREACHED */
 }
--- a/rfc931.c
+++ b/rfc931.c
@@ -68,20 +68,50 @@ int     sig;
 /* rfc931 - return remote user name, given socket structures */
 
 void    rfc931(rmt_sin, our_sin, dest)
+#ifdef INET6
+struct sockaddr *rmt_sin;
+struct sockaddr *our_sin;
+#else
 struct sockaddr_in *rmt_sin;
 struct sockaddr_in *our_sin;
+#endif
 char   *dest;
 {
     unsigned rmt_port;
     unsigned our_port;
+#ifdef INET6
+    struct sockaddr_storage rmt_query_sin;
+    struct sockaddr_storage our_query_sin;
+    int alen;
+#else
     struct sockaddr_in rmt_query_sin;
     struct sockaddr_in our_query_sin;
+#endif
     char    user[256];			/* XXX */
     char    buffer[512];		/* XXX */
     char   *cp;
     char   *result = unknown;
     FILE   *fp;
 
+#ifdef INET6
+    /* address family must be the same */
+    if (rmt_sin->sa_family != our_sin->sa_family) {
+	STRN_CPY(dest, result, STRING_LENGTH);
+	return;
+    }
+    switch (our_sin->sa_family) {
+    case AF_INET:
+	alen = sizeof(struct sockaddr_in);
+	break;
+    case AF_INET6:
+	alen = sizeof(struct sockaddr_in6);
+	break;
+    default:
+	STRN_CPY(dest, result, STRING_LENGTH);
+	return;
+    }
+#endif
+
     /*
      * Use one unbuffered stdio stream for writing to and for reading from
      * the RFC931 etc. server. This is done because of a bug in the SunOS
@@ -92,7 +122,11 @@ char   *dest;
      * sockets.
      */
 
+#ifdef INET6
+    if ((fp = fsocket(our_sin->sa_family, SOCK_STREAM, 0)) != 0) {
+#else
     if ((fp = fsocket(AF_INET, SOCK_STREAM, 0)) != 0) {
+#endif
 	setbuf(fp, (char *) 0);
 
 	/*
@@ -112,6 +146,25 @@ char   *dest;
 	     * addresses from the query socket.
 	     */
 
+#ifdef INET6
+	    memcpy(&our_query_sin, our_sin, alen);
+	    memcpy(&rmt_query_sin, rmt_sin, alen);
+	    switch (our_sin->sa_family) {
+	    case AF_INET:
+		((struct sockaddr_in *)&our_query_sin)->sin_port = htons(ANY_PORT);
+		((struct sockaddr_in *)&rmt_query_sin)->sin_port = htons(RFC931_PORT);
+		break;
+	    case AF_INET6:
+		((struct sockaddr_in6 *)&our_query_sin)->sin6_port = htons(ANY_PORT);
+		((struct sockaddr_in6 *)&rmt_query_sin)->sin6_port = htons(RFC931_PORT);
+		break;
+	    }
+
+	    if (bind(fileno(fp), (struct sockaddr *) & our_query_sin,
+		     alen) >= 0 &&
+		connect(fileno(fp), (struct sockaddr *) & rmt_query_sin,
+			alen) >= 0) {
+#else
 	    our_query_sin = *our_sin;
 	    our_query_sin.sin_port = htons(ANY_PORT);
 	    rmt_query_sin = *rmt_sin;
@@ -121,6 +174,7 @@ char   *dest;
 		     sizeof(our_query_sin)) >= 0 &&
 		connect(fileno(fp), (struct sockaddr *) & rmt_query_sin,
 			sizeof(rmt_query_sin)) >= 0) {
+#endif
 
 		/*
 		 * Send query to server. Neglect the risk that a 13-byte
@@ -129,8 +183,13 @@ char   *dest;
 		 */
 
 		fprintf(fp, "%u,%u\r\n",
+#ifdef INET6
+			ntohs(((struct sockaddr_in *)rmt_sin)->sin_port),
+			ntohs(((struct sockaddr_in *)our_sin)->sin_port));
+#else
 			ntohs(rmt_sin->sin_port),
 			ntohs(our_sin->sin_port));
+#endif
 		fflush(fp);
 
 		/*
@@ -144,8 +203,13 @@ char   *dest;
 		    && ferror(fp) == 0 && feof(fp) == 0
 		    && sscanf(buffer, "%u , %u : USERID :%*[^:]:%255s",
 			      &rmt_port, &our_port, user) == 3
+#ifdef INET6
+		    && ntohs(((struct sockaddr_in *)rmt_sin)->sin_port) == rmt_port
+		    && ntohs(((struct sockaddr_in *)our_sin)->sin_port) == our_port) {
+#else
 		    && ntohs(rmt_sin->sin_port) == rmt_port
 		    && ntohs(our_sin->sin_port) == our_port) {
+#endif
 
 		    /*
 		     * Strip trailing carriage return. It is part of the
--- a/scaffold.c
+++ b/scaffold.c
@@ -25,7 +25,9 @@ static char sccs_id[] = "@(#) scaffold.c
 #define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
 #endif
 
+#ifndef INET6
 extern char *malloc();
+#endif
 
 /* Application-specific. */
 
@@ -39,6 +41,7 @@ int     allow_severity = SEVERITY;
 int     deny_severity = LOG_WARNING;
 int     rfc931_timeout = RFC931_TIMEOUT;
 
+#ifndef INET6
 /* dup_hostent - create hostent in one memory block */
 
 static struct hostent *dup_hostent(hp)
@@ -73,9 +76,46 @@ struct hostent *hp;
     }
     return (&hb->host);
 }
+#endif
 
 /* find_inet_addr - find all addresses for this host, result to free() */
 
+#ifdef INET6
+struct addrinfo *find_inet_addr(host)
+char   *host;
+{
+    struct addrinfo hints, *res;
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = PF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+    if (getaddrinfo(host, NULL, &hints, &res) == 0)
+	return (res);
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = PF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE | AI_CANONNAME;
+    if (getaddrinfo(host, NULL, &hints, &res) != 0) {
+	tcpd_warn("%s: host not found", host);
+	return (0);
+    }
+    if (res->ai_family != AF_INET6 && res->ai_family != AF_INET) {
+	tcpd_warn("%d: not an internet host", res->ai_family);
+	freeaddrinfo(res);
+	return (0);
+    }
+    if (!res->ai_canonname) {
+	tcpd_warn("%s: hostname alias", host);
+	tcpd_warn("(cannot obtain official name)", res->ai_canonname);
+    } else if (STR_NE(host, res->ai_canonname)) {
+	tcpd_warn("%s: hostname alias", host);
+	tcpd_warn("(official name: %.*s)", STRING_LENGTH, res->ai_canonname);
+    }
+    return (res);
+}
+#else
 struct hostent *find_inet_addr(host)
 char   *host;
 {
@@ -118,6 +158,7 @@ char   *host;
     }
     return (dup_hostent(hp));
 }
+#endif
 
 /* check_dns - give each address thorough workout, return address count */
 
@@ -125,8 +166,13 @@ int     check_dns(host)
 char   *host;
 {
     struct request_info request;
+#ifdef INET6
+    struct sockaddr_storage sin;
+    struct addrinfo *hp, *res;
+#else
     struct sockaddr_in sin;
     struct hostent *hp;
+#endif
     int     count;
     char   *addr;
 
@@ -134,11 +180,18 @@ char   *host;
 	return (0);
     request_init(&request, RQ_CLIENT_SIN, &sin, 0);
     sock_methods(&request);
+#ifndef INET6
     memset((char *) &sin, 0, sizeof(sin));
     sin.sin_family = AF_INET;
+#endif
 
+#ifdef INET6
+    for (res = hp, count = 0; res; res = res->ai_next, count++) {
+	memcpy(&sin, res->ai_addr, res->ai_addrlen);
+#else
     for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
 	memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
+#endif
 
 	/*
 	 * Force host name and address conversions. Use the request structure
@@ -151,7 +204,11 @@ char   *host;
 	    tcpd_warn("host address %s->name lookup failed",
 		      eval_hostaddr(request.client));
     }
+#ifdef INET6
+    freeaddrinfo(hp);
+#else
     free((char *) hp);
+#endif
     return (count);
 }
 
--- a/scaffold.h
+++ b/scaffold.h
@@ -4,6 +4,10 @@
   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
   */
 
+#ifdef INET6
+extern struct addrinfo *find_inet_addr();
+#else
 extern struct hostent *find_inet_addr();
+#endif
 extern int check_dns();
 extern int check_path();
--- a/socket.c
+++ b/socket.c
@@ -24,13 +24,22 @@ static char sccsid[] = "@(#) socket.c 1.
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/socket.h>
+#ifdef INT32_T
+typedef uint32_t u_int32_t;
+#endif
 #include <netinet/in.h>
 #include <netdb.h>
 #include <stdio.h>
 #include <syslog.h>
 #include <string.h>
 
+#ifdef INET6
+#ifndef NI_WITHSCOPEID
+#define NI_WITHSCOPEID	0
+#endif
+#else
 extern char *inet_ntoa();
+#endif
 
 /* Local stuff. */
 
@@ -79,8 +88,13 @@ char   *name;
 void    sock_host(request)
 struct request_info *request;
 {
+#ifdef INET6
+    static struct sockaddr_storage client;
+    static struct sockaddr_storage server;
+#else
     static struct sockaddr_in client;
     static struct sockaddr_in server;
+#endif
     int     len;
     char    buf[BUFSIZ];
     int     fd = request->fd;
@@ -109,7 +123,11 @@ struct request_info *request;
 	memset(buf, 0 sizeof(buf));
 #endif
     }
+#ifdef INET6
+    request->client->sin = (struct sockaddr *)&client;
+#else
     request->client->sin = &client;
+#endif
 
     /*
      * Determine the server binding. This is used for client username
@@ -122,7 +140,11 @@ struct request_info *request;
 	tcpd_warn("getsockname: %m");
 	return;
     }
+#ifdef INET6
+    request->server->sin = (struct sockaddr *)&server;
+#else
     request->server->sin = &server;
+#endif
 }
 
 /* sock_hostaddr - map endpoint address to printable form */
@@ -130,10 +152,26 @@ struct request_info *request;
 void    sock_hostaddr(host)
 struct host_info *host;
 {
+#ifdef INET6
+    struct sockaddr *sin = host->sin;
+    int salen;
+
+    if (!sin)
+	return;
+#ifdef SIN6_LEN
+    salen = sin->sa_len;
+#else
+    salen = (sin->sa_family == AF_INET) ? sizeof(struct sockaddr_in)
+					: sizeof(struct sockaddr_in6);
+#endif
+    getnameinfo(sin, salen, host->addr, sizeof(host->addr),
+		NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID);
+#else
     struct sockaddr_in *sin = host->sin;
 
     if (sin != 0)
 	STRN_CPY(host->addr, inet_ntoa(sin->sin_addr), sizeof(host->addr));
+#endif
 }
 
 /* sock_hostname - map endpoint address to host name */
@@ -141,6 +179,160 @@ struct host_info *host;
 void    sock_hostname(host)
 struct host_info *host;
 {
+#ifdef INET6
+    struct sockaddr *sin = host->sin;
+    struct sockaddr_in sin4;
+    struct addrinfo hints, *res, *res0 = NULL;
+    int salen, alen, err = 1;
+    char *ap = NULL, *rap, hname[NI_MAXHOST];
+
+    if (sin != NULL) {
+	if (sin->sa_family == AF_INET6) {
+	    struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sin;
+
+	    if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+		memset(&sin4, 0, sizeof(sin4));
+#ifdef SIN6_LEN
+		sin4.sin_len = sizeof(sin4);
+#endif
+		sin4.sin_family = AF_INET;
+		sin4.sin_port = sin6->sin6_port;
+		sin4.sin_addr.s_addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
+		sin = (struct sockaddr *)&sin4;
+	    }
+	}
+	switch (sin->sa_family) {
+	case AF_INET:
+	    ap = (char *)&((struct sockaddr_in *)sin)->sin_addr;
+	    alen = sizeof(struct in_addr);
+	    salen = sizeof(struct sockaddr_in);
+	    break;
+	case AF_INET6:
+	    ap = (char *)&((struct sockaddr_in6 *)sin)->sin6_addr;
+	    alen = sizeof(struct in6_addr);
+	    salen = sizeof(struct sockaddr_in6);
+	    break;
+	default:
+	    break;
+	}
+	if (ap)
+	    err = getnameinfo(sin, salen, hname, sizeof(hname),
+			      NULL, 0, NI_WITHSCOPEID | NI_NAMEREQD);
+    }
+    if (!err) {
+
+	STRN_CPY(host->name, hname, sizeof(host->name));
+
+	/* reject numeric addresses */
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = sin->sa_family;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_flags = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST;
+	if ((err = getaddrinfo(host->name, NULL, &hints, &res0) == 0)) {
+	    freeaddrinfo(res0);
+	    res0 = NULL;
+	    tcpd_warn("host name/name mismatch: "
+		      "reverse lookup results in non-FQDN %s",
+		      host->name);
+	    strcpy(host->name, paranoid);	/* name is bad, clobber it */
+	}
+	err = !err;
+    }
+    if (!err) {
+	/* we are now sure that this is non-numeric */
+
+	/*
+	 * Verify that the address is a member of the address list returned
+	 * by gethostbyname(hostname).
+	 * 
+	 * Verify also that gethostbyaddr() and gethostbyname() return the same
+	 * hostname, or rshd and rlogind may still end up being spoofed.
+	 * 
+	 * On some sites, gethostbyname("localhost") returns "localhost.domain".
+	 * This is a DNS artefact. We treat it as a special case. When we
+	 * can't believe the address list from gethostbyname("localhost")
+	 * we're in big trouble anyway.
+	 */
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = sin->sa_family;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_flags = AI_PASSIVE | AI_CANONNAME;
+	if (getaddrinfo(host->name, NULL, &hints, &res0) != 0) {
+
+	    /*
+	     * Unable to verify that the host name matches the address. This
+	     * may be a transient problem or a botched name server setup.
+	     */
+
+	    tcpd_warn("can't verify hostname: getaddrinfo(%s, %s) failed",
+		      host->name,
+		      (sin->sa_family == AF_INET) ? "AF_INET" : "AF_INET6");
+
+	} else if ((res0->ai_canonname == NULL
+		    || STR_NE(host->name, res0->ai_canonname))
+		   && STR_NE(host->name, "localhost")) {
+
+	    /*
+	     * The gethostbyaddr() and gethostbyname() calls did not return
+	     * the same hostname. This could be a nameserver configuration
+	     * problem. It could also be that someone is trying to spoof us.
+	     */
+
+	    tcpd_warn("host name/name mismatch: %s != %.*s",
+		      host->name, STRING_LENGTH,
+		      (res0->ai_canonname == NULL) ? "" : res0->ai_canonname);
+
+	} else {
+
+	    /*
+	     * The address should be a member of the address list returned by
+	     * gethostbyname(). We should first verify that the h_addrtype
+	     * field is AF_INET, but this program has already caused too much
+	     * grief on systems with broken library code.
+	     */
+
+	    for (res = res0; res; res = res->ai_next) {
+		if (res->ai_family != sin->sa_family)
+		    continue;
+		switch (res->ai_family) {
+		case AF_INET:
+		    rap = (char *)&((struct sockaddr_in *)res->ai_addr)->sin_addr;
+		    break;
+		case AF_INET6:
+		    /* need to check scope_id */
+		    if (((struct sockaddr_in6 *)sin)->sin6_scope_id !=
+		        ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id) {
+			continue;
+		    }
+		    rap = (char *)&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+		    break;
+		default:
+		    continue;
+		}
+		if (memcmp(rap, ap, alen) == 0) {
+		    freeaddrinfo(res0);
+		    return;			/* name is good, keep it */
+		}
+	    }
+
+	    /*
+	     * The host name does not map to the initial address. Perhaps
+	     * someone has messed up. Perhaps someone compromised a name
+	     * server.
+	     */
+
+	    getnameinfo(sin, salen, hname, sizeof(hname),
+			NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID);
+	    tcpd_warn("host name/address mismatch: %s != %.*s",
+		      hname, STRING_LENGTH,
+		      (res0->ai_canonname == NULL) ? "" : res0->ai_canonname);
+	}
+	strcpy(host->name, paranoid);		/* name is bad, clobber it */
+	if (res0)
+	    freeaddrinfo(res0);
+    }
+#else /* INET6 */
     struct sockaddr_in *sin = host->sin;
     struct hostent *hp;
     int     i;
@@ -220,6 +412,7 @@ struct host_info *host;
 	}
 	strcpy(host->name, paranoid);		/* name is bad, clobber it */
     }
+#endif /* INET6 */
 }
 
 /* sock_sink - absorb unreceived IP datagram */
@@ -228,7 +421,11 @@ static void sock_sink(fd)
 int     fd;
 {
     char    buf[BUFSIZ];
+#ifdef INET6
+    struct sockaddr_storage sin;
+#else
     struct sockaddr_in sin;
+#endif
     int     size = sizeof(sin);
 
     /*
--- a/tcpd.c
+++ b/tcpd.c
@@ -120,7 +120,12 @@ char  **argv;
 
     /* Report request and invoke the real daemon program. */
 
+#ifdef INET6
+    syslog(allow_severity, "connect from %s (%s)",
+	   eval_client(&request), eval_hostaddr(request.client));
+#else
     syslog(allow_severity, "connect from %s", eval_client(&request));
+#endif
     closelog();
     (void) execv(path, argv);
     syslog(LOG_ERR, "error: cannot execute %s: %m", path);
--- a/tcpdchk.c
+++ b/tcpdchk.c
@@ -22,6 +22,9 @@ static char sccsid[] = "@(#) tcpdchk.c 1
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#ifdef INET6
+#include <sys/socket.h>
+#endif
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdio.h>
@@ -397,6 +400,31 @@ char   *pat;
     }
 }
 
+#ifdef INET6
+static int is_inet6_addr(pat)
+    char *pat;
+{
+    struct addrinfo hints, *res;
+    int len, ret;
+    char ch;
+
+    if (*pat != '[')
+	return (0);
+    len = strlen(pat);
+    if ((ch = pat[len - 1]) != ']')
+	return (0);
+    pat[len - 1] = '\0';
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET6;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+    if ((ret = getaddrinfo(pat + 1, NULL, &hints, &res)) == 0)
+	freeaddrinfo(res);
+    pat[len - 1] = ch;
+    return (ret == 0);
+}
+#endif
+
 /* check_host - criticize host pattern */
 
 static int check_host(pat)
@@ -423,14 +451,27 @@ char   *pat;
 #endif
 #endif
     } else if (mask = split_at(pat, '/')) {	/* network/netmask */
+#ifdef INET6
+	int mask_len;
+
+	if ((dot_quad_addr(pat) == INADDR_NONE
+	    || dot_quad_addr(mask) == INADDR_NONE)
+	    && (!is_inet6_addr(pat)
+		|| ((mask_len = atoi(mask)) < 0 || mask_len > 128)))
+#else
 	if (dot_quad_addr(pat) == INADDR_NONE
 	    || dot_quad_addr(mask) == INADDR_NONE)
+#endif
 	    tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
     } else if (STR_EQ(pat, "FAIL")) {		/* obsolete */
 	tcpd_warn("FAIL is no longer recognized");
 	tcpd_warn("(use EXCEPT or DENY instead)");
     } else if (reserved_name(pat)) {		/* other reserved */
 	 /* void */ ;
+#ifdef INET6
+    } else if (is_inet6_addr(pat)) { /* IPv6 address */
+	addr_count = 1;
+#endif
     } else if (NOT_INADDR(pat)) {		/* internet name */
 	if (pat[strlen(pat) - 1] == '.') {
 	    tcpd_warn("%s: domain or host name ends in dot", pat);
--- a/tcpd.h
+++ b/tcpd.h
@@ -11,7 +11,11 @@
 struct host_info {
     char    name[STRING_LENGTH];	/* access via eval_hostname(host) */
     char    addr[STRING_LENGTH];	/* access via eval_hostaddr(host) */
+#ifdef INET6
+    struct sockaddr *sin;		/* socket address or 0 */
+#else
     struct sockaddr_in *sin;		/* socket address or 0 */
+#endif
     struct t_unitdata *unit;		/* TLI transport address or 0 */
     struct request_info *request;	/* for shared information */
 };
--- a/tcpdmatch.c
+++ b/tcpdmatch.c
@@ -57,7 +57,11 @@ int     main(argc, argv)
 int     argc;
 char  **argv;
 {
+#ifdef INET6
+    struct addrinfo hints, *hp, *res;
+#else
     struct hostent *hp;
+#endif
     char   *myname = argv[0];
     char   *client;
     char   *server;
@@ -68,8 +72,13 @@ char  **argv;
     int     ch;
     char   *inetcf = 0;
     int     count;
+#ifdef INET6
+    struct sockaddr_storage server_sin;
+    struct sockaddr_storage client_sin;
+#else
     struct sockaddr_in server_sin;
     struct sockaddr_in client_sin;
+#endif
     struct stat st;
 
     /*
@@ -172,13 +181,20 @@ char  **argv;
     if (NOT_INADDR(server) == 0 || HOSTNAME_KNOWN(server)) {
 	if ((hp = find_inet_addr(server)) == 0)
 	    exit(1);
+#ifndef INET6
 	memset((char *) &server_sin, 0, sizeof(server_sin));
 	server_sin.sin_family = AF_INET;
+#endif
 	request_set(&request, RQ_SERVER_SIN, &server_sin, 0);
 
+#ifdef INET6
+	for (res = hp, count = 0; res; res = res->ai_next, count++) {
+	    memcpy(&server_sin, res->ai_addr, res->ai_addrlen);
+#else
 	for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
 	    memcpy((char *) &server_sin.sin_addr, addr,
 		   sizeof(server_sin.sin_addr));
+#endif
 
 	    /*
 	     * Force evaluation of server host name and address. Host name
@@ -194,7 +210,11 @@ char  **argv;
 	    fprintf(stderr, "Please specify an address instead\n");
 	    exit(1);
 	}
+#ifdef INET6
+	freeaddrinfo(hp);
+#else
 	free((char *) hp);
+#endif
     } else {
 	request_set(&request, RQ_SERVER_NAME, server, 0);
     }
@@ -208,6 +228,18 @@ char  **argv;
 	tcpdmatch(&request);
 	exit(0);
     }
+#ifdef INET6
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET6;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+    if (getaddrinfo(client, NULL, &hints, &res) == 0) {
+	freeaddrinfo(res);
+	request_set(&request, RQ_CLIENT_ADDR, client, 0);
+	tcpdmatch(&request);
+	exit(0);
+    }
+#endif
 
     /*
      * Perhaps they are testing special client hostname patterns that aren't
@@ -229,6 +261,34 @@ char  **argv;
      */
     if ((hp = find_inet_addr(client)) == 0)
 	exit(1);
+#ifdef INET6
+    request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
+
+    for (res = hp, count = 0; res; res = res->ai_next, count++) {
+	memcpy(&client_sin, res->ai_addr, res->ai_addrlen);
+
+	/*
+	 * getnameinfo() doesn't do reverse lookup against link-local
+	 * address.  So, we pass through host name evaluation against
+	 * such addresses.
+	 */
+	if (res->ai_family != AF_INET6 ||
+	    !IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)) {
+	    /*
+	     * Force evaluation of client host name and address. Host name
+	     * conflicts will be reported while eval_hostname() does its job.
+	     */
+	    request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
+	    if (STR_EQ(eval_hostname(request.client), unknown))
+		tcpd_warn("host address %s->name lookup failed",
+			  eval_hostaddr(request.client));
+	}
+	tcpdmatch(&request);
+	if (res->ai_next)
+	    printf("\n");
+    }
+    freeaddrinfo(hp);
+#else
     memset((char *) &client_sin, 0, sizeof(client_sin));
     client_sin.sin_family = AF_INET;
     request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
@@ -250,6 +310,7 @@ char  **argv;
 	    printf("\n");
     }
     free((char *) hp);
+#endif
     exit(0);
 }
 
--- a/tli.c
+++ b/tli.c
@@ -65,8 +65,13 @@ static void tli_sink();
 void    tli_host(request)
 struct request_info *request;
 {
+#ifdef INET6
+    static struct sockaddr_storage client;
+    static struct sockaddr_storage server;
+#else
     static struct sockaddr_in client;
     static struct sockaddr_in server;
+#endif
 
     /*
      * If we discover that we are using an IP transport, pretend we never
@@ -76,14 +81,29 @@ struct request_info *request;
 
     tli_endpoints(request);
     if ((request->config = tli_transport(request->fd)) != 0
+#ifdef INET6
+	&& (STR_EQ(request->config->nc_protofmly, "inet") ||
+	    STR_EQ(request->config->nc_protofmly, "inet6"))) {
+#else
 	&& STR_EQ(request->config->nc_protofmly, "inet")) {
+#endif
 	if (request->client->unit != 0) {
+#ifdef INET6
+	    client = *(struct sockaddr_storage *) request->client->unit->addr.buf;
+	    request->client->sin = (struct sockaddr *) &client;
+#else
 	    client = *(struct sockaddr_in *) request->client->unit->addr.buf;
 	    request->client->sin = &client;
+#endif
 	}
 	if (request->server->unit != 0) {
+#ifdef INET6
+	    server = *(struct sockaddr_storage *) request->server->unit->addr.buf;
+	    request->server->sin = (struct sockaddr *) &server;
+#else
 	    server = *(struct sockaddr_in *) request->server->unit->addr.buf;
 	    request->server->sin = &server;
+#endif
 	}
 	tli_cleanup(request);
 	sock_methods(request);
@@ -187,7 +207,15 @@ int     fd;
     }
     while (config = getnetconfig(handlep)) {
 	if (stat(config->nc_device, &from_config) == 0) {
+#ifdef NO_CLONE_DEVICE
+	/*
+	 * If the network devices are not cloned (as is the case for
+	 * Solaris 8 Beta), we must compare the major device numbers.
+	 */
+	    if (major(from_config.st_rdev) == major(from_client.st_rdev))
+#else
 	    if (minor(from_config.st_rdev) == major(from_client.st_rdev))
+#endif
 		break;
 	}
     }
--- a/update.c
+++ b/update.c
@@ -46,10 +46,18 @@ va_list ap;
 	    request->fd = va_arg(ap, int);
 	    continue;
 	case RQ_CLIENT_SIN:
+#ifdef INET6
+	    request->client->sin = va_arg(ap, struct sockaddr *);
+#else
 	    request->client->sin = va_arg(ap, struct sockaddr_in *);
+#endif
 	    continue;
 	case RQ_SERVER_SIN:
+#ifdef INET6
+	    request->server->sin = va_arg(ap, struct sockaddr *);
+#else
 	    request->server->sin = va_arg(ap, struct sockaddr_in *);
+#endif
 	    continue;
 
 	    /*
--- a/workarounds.c
+++ b/workarounds.c
@@ -166,11 +166,22 @@ struct sockaddr *sa;
 int    *len;
 {
     int     ret;
+#ifdef INET6
+    struct sockaddr *sin = sa;
+#else
     struct sockaddr_in *sin = (struct sockaddr_in *) sa;
+#endif
 
     if ((ret = getpeername(sock, sa, len)) >= 0
+#ifdef INET6
+	&& ((sin->su_si.si_family == AF_INET6
+	     && IN6_IS_ADDR_UNSPECIFIED(&sin->su_sin6.sin6_addr))
+	    || (sin->su_si.si_family == AF_INET
+		&& sin->su_sin.sin_addr.s_addr == 0))) {
+#else
 	&& sa->sa_family == AF_INET
 	&& sin->sin_addr.s_addr == 0) {
+#endif
 	errno = ENOTCONN;
 	return (-1);
     } else {