When no listener is specified, create a listener on every IP. Problem

reported by Peter Hessler.  ok henning@

src/usr.sbin/ntpd/server.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: server.c,v 1.2 2004/06/18 04:51:31 henning Exp $ */
+/*	$OpenBSD: server.c,v 1.3 2004/06/29 18:34:00 alexander Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -16,8 +16,10 @@
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 #include <errno.h>
+#include <ifaddrs.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -28,46 +30,67 @@
 int
 setup_listeners(struct servent *se, struct ntpd_conf *conf, u_int *cnt)
 {
+	char 			 ntopbuf[INET6_ADDRSTRLEN];
 	struct listen_addr	*la;
+	struct ifaddrs		*ifap;
+	struct sockaddr		*sap;
 	u_int			 new_cnt = 0;
 
 	if (TAILQ_EMPTY(&conf->listen_addrs)) {
-		if ((la = calloc(1, sizeof(struct listen_addr))) == NULL)
-			fatal("setup_listeners calloc");
-		la->sa.ss_len = sizeof(struct sockaddr_in);
-		((struct sockaddr_in *)&la->sa)->sin_family = AF_INET;
-		((struct sockaddr_in *)&la->sa)->sin_addr.s_addr =
-		    htonl(INADDR_ANY);
-		((struct sockaddr_in *)&la->sa)->sin_port = se->s_port;
-		TAILQ_INSERT_TAIL(&conf->listen_addrs, la, entry);
-
-		if ((la = calloc(1, sizeof(struct listen_addr))) == NULL)
-			fatal("setup_listeners calloc");
-		la->sa.ss_len = sizeof(struct sockaddr_in6);
-		((struct sockaddr_in6 *)&la->sa)->sin6_family = AF_INET6;
-		((struct sockaddr_in6 *)&la->sa)->sin6_port = se->s_port;
-		TAILQ_INSERT_TAIL(&conf->listen_addrs, la, entry);
+		if (getifaddrs(&ifap) == -1)
+			fatal("getifaddrs");
+
+		for (; ifap != NULL; ifap = ifap->ifa_next) {
+			sap = ifap->ifa_addr;
+
+			if (sap->sa_family != AF_INET &&
+			    sap->sa_family != AF_INET6)
+				continue;
+
+			if ((la = calloc(1, sizeof(struct listen_addr))) ==
+			    NULL)
+				fatal("setup_listeners calloc");
+
+			memcpy(&la->sa, sap, SA_LEN(sap));
+			TAILQ_INSERT_TAIL(&conf->listen_addrs, la, entry);
+		}
+
+		freeifaddrs(ifap);
 	}
 
 	TAILQ_FOREACH(la, &conf->listen_addrs, entry) {
+		sap = (struct sockaddr *)&la->sa;
 		new_cnt++;
 
 		switch (la->sa.ss_family) {
 		case AF_INET:
-			if (((struct sockaddr_in *)&la->sa)->sin_port == 0)
-				((struct sockaddr_in *)&la->sa)->sin_port =
+
+			if (((struct sockaddr_in *)sap)->sin_port == 0)
+				((struct sockaddr_in *)sap)->sin_port =
 				    se->s_port;
+
+			inet_ntop(AF_INET,
+				  &((struct sockaddr_in *)sap)->sin_addr,
+				  ntopbuf, sizeof(ntopbuf));
+
 			break;
 		case AF_INET6:
-			if (((struct sockaddr_in6 *)&la->sa)->sin6_port == 0)
-				((struct sockaddr_in6 *)&la->sa)->sin6_port =
+
+			if (((struct sockaddr_in6 *)sap)->sin6_port == 0)
+				((struct sockaddr_in6 *)sap)->sin6_port =
 				    se->s_port;
+
+			inet_ntop(AF_INET6,
+		       		  &((struct sockaddr_in6 *)sap)->sin6_addr,
+				  ntopbuf, sizeof(ntopbuf));
 			break;
 		default:
 			fatalx("king bula sez: af borked");
 
 		}
 
+		log_debug("adding listener on %s", ntopbuf);
+
 		if ((la->fd = socket(la->sa.ss_family, SOCK_DGRAM, 0)) == -1)
 			fatal("socket");