- IPv6 support to login command

--- util-linux-2.13-pre6/login-utils/login.c.ipv6	2006-10-12 10:10:34.000000000 +0200
+++ util-linux-2.13-pre6/login-utils/login.c	2006-10-12 10:17:16.000000000 +0200
@@ -173,7 +173,7 @@
 #ifdef HAVE_SECURITY_PAM_MISC_H
 static struct passwd pwdcopy;
 #endif
-char    hostaddress[4];		/* used in checktty.c */
+char    hostaddress[16];	/* used in checktty.c */
 char	*hostname;		/* idem */
 static char	*username, *tty_name, *tty_number;
 static char	thishost[100];
@@ -281,7 +281,7 @@
 	if (hostname) {
 		xstrncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
 		if (hostaddress[0])
-			memcpy(&ut.ut_addr, hostaddress, sizeof(ut.ut_addr));
+			memcpy(&ut.ut_addr_v6, hostaddress, sizeof(ut.ut_addr_v6));
 	}
 #if HAVE_UPDWTMP		/* bad luck for ancient systems */
 	updwtmp(_PATH_BTMP, &ut);
@@ -380,13 +380,33 @@
 
 	  hostname = strdup(optarg); 	/* strdup: Ambrose C. Li */
 	  {
-		  struct hostent *he = gethostbyname(hostname);
+		struct addrinfo hints, *info = NULL;
+		
+		memset(&hints, '\0', sizeof(hints));
+		hints.ai_flags = AI_ADDRCONFIG;
+
+		hostaddress[0] = 0;
 
-		  /* he points to static storage; copy the part we use */
-		  hostaddress[0] = 0;
-		  if (he && he->h_addr_list && he->h_addr_list[0])
-			  memcpy(hostaddress, he->h_addr_list[0],
-				 sizeof(hostaddress));
+		if (getaddrinfo(hostname, NULL, &hints, &info)==0 && info)
+		{
+			if (info->ai_family == AF_INET)
+			{
+			    struct sockaddr_in *sa4;
+			    
+			    sa4 = (struct sockaddr_in *) info->ai_addr;
+			    memcpy(hostaddress, &(sa4->sin_addr), 
+					    sizeof(sa4->sin_addr));
+			}
+			if (info->ai_family == AF_INET6)
+			{
+			    struct sockaddr_in6 *sa6;
+			    
+			    sa6 = (struct sockaddr_in6 *) info->ai_addr;
+			    memcpy(hostaddress, &(sa6->sin6_addr), 
+					    sizeof(sa6->sin6_addr));
+			}
+			freeaddrinfo(info);
+		}
 	  }
 	  break;
 	  
@@ -906,7 +926,7 @@
 	if (hostname) {
 		xstrncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
 		if (hostaddress[0])
-			memcpy(&ut.ut_addr, hostaddress, sizeof(ut.ut_addr));
+			memcpy(&ut.ut_addr_v6, hostaddress, sizeof(ut.ut_addr_v6));
 	}
 	
 	pututline(&ut);
--- util-linux-2.13-pre6/login-utils/login.h.ipv6	2005-08-02 14:01:18.000000000 +0200
+++ util-linux-2.13-pre6/login-utils/login.h	2006-10-12 10:10:34.000000000 +0200
@@ -1,7 +1,7 @@
 /* defined in login.c */
 extern void badlogin(const char *s);
 extern void sleepexit(int);
-extern char hostaddress[4];
+extern char hostaddress[16];
 extern char *hostname;
 
 /* defined in checktty.c */