Fix gethostbyaddr() prototype to conform to IEEE Std 1003.1:

http://www.opengroup.org/onlinepubs/009695399/functions/gethostbyaddr.html

gethostbyaddr_r() is changed as well.
It breaks ABI backward compatibility on 64 bit arch.  So, we fix it
on 32 bit arch only for now.

Reported by:	Rostislav Krasny <rosti.bsd@gmail.com>

include/netdb.h

@@ -63,6 +63,7 @@
 
 #include <sys/cdefs.h>
 #include <sys/_types.h>
+#include <machine/_limits.h>
 
 #ifndef _SIZE_T_DECLARED
 typedef	__size_t	size_t;
@@ -220,9 +221,15 @@ void		endnetgrent(void);
 void		endprotoent(void);
 void		endservent(void);
 void		freehostent(struct hostent *);
-struct hostent	*gethostbyaddr(const char *, int, int);
+#if __LONG_BIT == 64
-int		gethostbyaddr_r(const char *, int, int, struct hostent *,
+struct hostent	*gethostbyaddr(const void *, int, int);
+int		gethostbyaddr_r(const void *, int, int, struct hostent *,
     char *, size_t, struct hostent **, int *);
+#else
+struct hostent	*gethostbyaddr(const void *, socklen_t, int);
+int		gethostbyaddr_r(const void *, socklen_t, int, struct hostent *,
+    char *, size_t, struct hostent **, int *);
+#endif
 struct hostent	*gethostbyname(const char *);
 int		gethostbyname_r(const char *, struct hostent *, char *, size_t,
     struct hostent **, int *);

lib/libc/net/gethostbydns.c

@@ -550,11 +550,13 @@ _dns_gethostbyname(void *rval, void *cb_data, va_list ap)
 int
 _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 {
-	const u_char *uaddr;
+	const void *addr;
-	int len, af;
+	socklen_t len;
+	int af;
 	char *buffer;
 	size_t buflen;
 	int *errnop, *h_errnop;
+	const u_char *uaddr;
 	struct hostent *hptr, he;
 	struct hostent_data *hed;
 	int n;
@@ -570,14 +572,15 @@ _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 	int ret_h_error;
 #endif /*SUNSECURITY*/
 
-	uaddr = va_arg(ap, const u_char *);
+	addr = va_arg(ap, const void *);
-	len = va_arg(ap, int);
+	len = va_arg(ap, socklen_t);
 	af = va_arg(ap, int);
 	hptr = va_arg(ap, struct hostent *);
 	buffer = va_arg(ap, char *);
 	buflen = va_arg(ap, size_t);
 	errnop = va_arg(ap, int *);
 	h_errnop = va_arg(ap, int *);
+	uaddr = (const u_char *)addr;
 
 	*((struct hostent **)rval) = NULL;
 

lib/libc/net/gethostbyht.c

@@ -282,8 +282,9 @@ _ht_gethostbyname(void *rval, void *cb_data, va_list ap)
 int
 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 {
-	const char *addr;
+	const void *addr;
-	int len, af;
+	socklen_t len;
+	int af;
 	char *buffer;
 	size_t buflen;
 	int *errnop, *h_errnop;
@@ -292,8 +293,8 @@ _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 	res_state statp;
 	int error;
 
-	addr = va_arg(ap, const char *);
+	addr = va_arg(ap, const void *);
-	len = va_arg(ap, int);
+	len = va_arg(ap, socklen_t);
 	af = va_arg(ap, int);
 	hptr = va_arg(ap, struct hostent *);
 	buffer = va_arg(ap, char *);

lib/libc/net/gethostbyname.3

@@ -55,7 +55,7 @@
 .Ft struct hostent *
 .Fn gethostbyname2 "const char *name" "int af"
 .Ft struct hostent *
-.Fn gethostbyaddr "const char *addr" "int len" "int type"
+.Fn gethostbyaddr "const void *addr" "socklen_t len" "int type"
 .Ft struct hostent *
 .Fn gethostent void
 .Ft void
@@ -246,7 +246,7 @@ struct hostent *hp;
 if (!inet_aton(ipstr, &ip))
 	errx(1, "can't parse IP address %s", ipstr);
 
-if ((hp = gethostbyaddr((const char *)&ip,
+if ((hp = gethostbyaddr((const void *)&ip,
     sizeof ip, AF_INET)) == NULL)
 	errx(1, "no name associated with %s", ipstr);
 

lib/libc/net/gethostbynis.c

@@ -178,8 +178,8 @@ _gethostbynisname_r(const char *name, int af, struct hostent *he,
 }
 
 static int
-_gethostbynisaddr_r(const char *addr, int len, int af, struct hostent *he,
+_gethostbynisaddr_r(const void *addr, socklen_t len, int af,
-    struct hostent_data *hed)
+    struct hostent *he, struct hostent_data *hed)
 {
 	char *map;
 	char numaddr[46];
@@ -227,7 +227,7 @@ _gethostbynisname(const char *name, int af)
 }
 
 struct hostent *
-_gethostbynisaddr(const char *addr, int len, int af)
+_gethostbynisaddr(const void *addr, socklen_t len, int af)
 {
 #ifdef YP
 	struct hostent *he;
@@ -303,8 +303,8 @@ int
 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 {
 #ifdef YP
-	const char *addr;
+	const void *addr;
-	int len;
+	socklen_t len;
 	int af;
 	char *buffer;
 	size_t buflen;
@@ -313,8 +313,8 @@ _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 	struct hostent_data *hed;
 	res_state statp;
 
-	addr = va_arg(ap, const char *);
+	addr = va_arg(ap, const void *);
-	len = va_arg(ap, int);
+	len = va_arg(ap, socklen_t);
 	af = va_arg(ap, int);
 	hptr = va_arg(ap, struct hostent *);
 	buffer = va_arg(ap, char *);

lib/libc/net/gethostnamadr.c

@@ -573,8 +573,14 @@ gethostbyname_internal(const char *name, int af, struct hostent *hp, char *buf,
 }
 
 int
-gethostbyaddr_r(const char *addr, int len, int af, struct hostent *hp,
+gethostbyaddr_r(const void *addr,
-    char *buf, size_t buflen, struct hostent **result, int *h_errnop)
+#if __LONG_BIT == 64
+    int len,
+#else
+    socklen_t len,
+#endif
+    int af, struct hostent *hp, char *buf, size_t buflen,
+    struct hostent **result, int *h_errnop)
 {
 	const u_char *uaddr = (const u_char *)addr;
 	const struct in6_addr *addr6;
@@ -606,7 +612,7 @@ gethostbyaddr_r(const char *addr, int len, int af, struct hostent *hp,
 	}
 
 	if (af == AF_INET6 && len == NS_IN6ADDRSZ) {
-		addr6 = (const struct in6_addr *)(const void *)uaddr;
+		addr6 = (const struct in6_addr *)addr;
 		if (IN6_IS_ADDR_LINKLOCAL(addr6)) {
 			RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
 			*h_errnop = statp->res_h_errno;
@@ -678,7 +684,11 @@ gethostbyname2(const char *name, int af)
 }
 
 struct hostent *
-gethostbyaddr(const char *addr, int len, int af)
+#if __LONG_BIT == 64
+gethostbyaddr(const void *addr, int len, int af)
+#else
+gethostbyaddr(const void *addr, socklen_t len, int af)
+#endif
 {
 	struct hostdata *hd;
 	struct hostent *rval;

lib/libc/net/netdb_private.h

@@ -133,7 +133,7 @@ void _endhostdnsent(void);
 void _endhosthtent(struct hostent_data *);
 void _endnetdnsent(void);
 void _endnethtent(struct netent_data *);
-struct hostent *_gethostbynisaddr(const char *, int, int);
+struct hostent *_gethostbynisaddr(const void *, socklen_t, int);
 struct hostent *_gethostbynisname(const char *, int);
 void _map_v4v6_address(const char *, char *);
 void _map_v4v6_hostent(struct hostent *, char **, char *);