Make host_*() AF-agnostic

Merge host_v{4,6}() into much simpler host_ip() using just getaddrinfo().
host_dns() uses the same procedure.
OK naddy

src/usr.sbin/ntpd/config.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: config.c,v 1.28 2015/10/12 06:50:08 reyk Exp $ */
+/*	$OpenBSD: config.c,v 1.29 2018/09/07 20:31:39 kn Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -29,8 +29,7 @@
 
 #include "ntpd.h"
 
-struct ntp_addr	*host_v4(const char *);
-struct ntp_addr	*host_v6(const char *);
+struct ntp_addr	*host_ip(const char *);
 
 static u_int32_t		 maxid = 0;
 static u_int32_t		 constraint_maxid = 0;
@@ -38,70 +37,36 @@ static u_int32_t		 constraint_maxid = 0;
 void
 host(const char *s, struct ntp_addr **hn)
 {
-	struct ntp_addr	*h = NULL;
+	struct ntp_addr		*h;
 
-	if (!strcmp(s, "*"))
-		if ((h = calloc(1, sizeof(struct ntp_addr))) == NULL)
+	if (!strcmp(s, "*")) {
+		if ((h = calloc(1, sizeof(*h))) == NULL)
 			fatal(NULL);
-
-	/* IPv4 address? */
-	if (h == NULL)
-		h = host_v4(s);
-
-	/* IPv6 address? */
-	if (h == NULL)
-		h = host_v6(s);
-
-	if (h == NULL)
-		return;
+	} else {
+		if ((h = host_ip(s)) == NULL)
+			return;
+	}
 
 	*hn = h;
 }
 
 struct ntp_addr	*
-host_v4(const char *s)
-{
-	struct in_addr		 ina;
-	struct sockaddr_in	*sa_in;
-	struct ntp_addr		*h;
-
-	memset(&ina, 0, sizeof(struct in_addr));
-	if (inet_pton(AF_INET, s, &ina) != 1)
-		return (NULL);
-
-	if ((h = calloc(1, sizeof(struct ntp_addr))) == NULL)
-		fatal(NULL);
-	sa_in = (struct sockaddr_in *)&h->ss;
-	sa_in->sin_len = sizeof(struct sockaddr_in);
-	sa_in->sin_family = AF_INET;
-	sa_in->sin_addr.s_addr = ina.s_addr;
-
-	return (h);
-}
-
-struct ntp_addr	*
-host_v6(const char *s)
+host_ip(const char *s)
 {
 	struct addrinfo		 hints, *res;
-	struct sockaddr_in6	*sa_in6;
 	struct ntp_addr		*h = NULL;
 
 	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = AF_INET6;
+	hints.ai_family = AF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 	hints.ai_flags = AI_NUMERICHOST;
 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
-		if ((h = calloc(1, sizeof(struct ntp_addr))) == NULL)
-			fatal(NULL);
-		sa_in6 = (struct sockaddr_in6 *)&h->ss;
-		sa_in6->sin6_len = sizeof(struct sockaddr_in6);
-		sa_in6->sin6_family = AF_INET6;
-		memcpy(&sa_in6->sin6_addr,
-		    &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
-		    sizeof(sa_in6->sin6_addr));
-		sa_in6->sin6_scope_id =
-		    ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
-
+		if (res->ai_family == AF_INET ||
+		    res->ai_family == AF_INET6) {
+			if ((h = calloc(1, sizeof(*h))) == NULL)
+				fatal(NULL);
+			memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
+		}
 		freeaddrinfo(res);
 	}
 
@@ -124,12 +89,10 @@ host_dns(const char *s, struct ntp_addr **hn)
 {
 	struct addrinfo		 hints, *res0, *res;
 	int			 error, cnt = 0;
-	struct sockaddr_in	*sa_in;
-	struct sockaddr_in6	*sa_in6;
 	struct ntp_addr		*h, *hh = NULL;
 
 	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = PF_UNSPEC;
+	hints.ai_family = AF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
 	/* ntpd MUST NOT use AI_ADDRCONFIG here */
 	error = getaddrinfo(s, NULL, &hints, &res0);
@@ -145,20 +108,9 @@ host_dns(const char *s, struct ntp_addr **hn)
 		if (res->ai_family != AF_INET &&
 		    res->ai_family != AF_INET6)
 			continue;
-		if ((h = calloc(1, sizeof(struct ntp_addr))) == NULL)
+		if ((h = calloc(1, sizeof(*h))) == NULL)
 			fatal(NULL);
-		h->ss.ss_family = res->ai_family;
-		if (res->ai_family == AF_INET) {
-			sa_in = (struct sockaddr_in *)&h->ss;
-			sa_in->sin_len = sizeof(struct sockaddr_in);
-			sa_in->sin_addr.s_addr = ((struct sockaddr_in *)
-			    res->ai_addr)->sin_addr.s_addr;
-		} else {
-			sa_in6 = (struct sockaddr_in6 *)&h->ss;
-			sa_in6->sin6_len = sizeof(struct sockaddr_in6);
-			memcpy(&sa_in6->sin6_addr, &((struct sockaddr_in6 *)
-			    res->ai_addr)->sin6_addr, sizeof(struct in6_addr));
-		}
+		memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
 
 		h->next = hh;
 		hh = h;