resolv: Move res_isourserver to its own file and reformat to GNU style

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

3 files changed, 135 insertions, 51 deletions

diff --git a/resolv/Makefile b/resolv/Makefile
index 6eed73d..221bdc1 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -147,6 +147,7 @@ libresolv-routines := \
   res_data \
   res_debug \
   res_enable_icmp \
+  res_isourserver \
   res_mkquery \
   res_query \
   res_send \
diff --git a/resolv/res_isourserver.c b/resolv/res_isourserver.c
new file mode 100644
index 0000000..1e3576f
--- /dev/null
+++ b/resolv/res_isourserver.c
@@ -0,0 +1,134 @@
+/* Legacy function for expected server checking.
+   Copyright (C) 2016-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/*
+ * Copyright (c) 1985, 1989, 1993
+ *    The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/*
+ * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#include <resolv-internal.h>
+#include <resolv.h>
+#include <string.h>
+
+/* author: paul vixie, 29may94 */
+static int
+res_ourserver_p (const res_state statp, const struct sockaddr_in6 *inp)
+{
+  int ns;
+
+  if (inp->sin6_family == AF_INET)
+    {
+      struct sockaddr_in *in4p = (struct sockaddr_in *) inp;
+      in_port_t port = in4p->sin_port;
+      in_addr_t addr = in4p->sin_addr.s_addr;
+
+      for (ns = 0;  ns < statp->nscount;  ns++)
+        {
+          const struct sockaddr_in *srv =
+            (struct sockaddr_in *) __res_get_nsaddr (statp, ns);
+
+          if ((srv->sin_family == AF_INET) &&
+              (srv->sin_port == port) &&
+              (srv->sin_addr.s_addr == INADDR_ANY ||
+               srv->sin_addr.s_addr == addr))
+            return 1;
+        }
+    } else if (inp->sin6_family == AF_INET6)
+    {
+      for (ns = 0;  ns < statp->nscount;  ns++)
+        {
+          const struct sockaddr_in6 *srv
+            = (struct sockaddr_in6 *) __res_get_nsaddr (statp, ns);
+          if ((srv->sin6_family == AF_INET6) &&
+              (srv->sin6_port == inp->sin6_port) &&
+              !(memcmp (&srv->sin6_addr, &in6addr_any,
+                        sizeof (struct in6_addr)) &&
+                memcmp (&srv->sin6_addr, &inp->sin6_addr,
+                        sizeof (struct in6_addr))))
+            return 1;
+        }
+    }
+  return 0;
+}
+
+int
+res_isourserver (const struct sockaddr_in *inp)
+{
+  return res_ourserver_p (&_res, (const struct sockaddr_in6 *) inp);
+}
diff --git a/resolv/res_send.c b/resolv/res_send.c
index 78f564e..915fc6d 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -194,57 +194,6 @@ static int		sock_eq(struct sockaddr_in6 *, struct sockaddr_in6 *);
 /* Public. */
 
 /* int
- * res_isourserver(ina)
- *	looks up "ina" in _res.ns_addr_list[]
- * returns:
- *	0  : not found
- *	>0 : found
- * author:
- *	paul vixie, 29may94
- */
-int
-res_ourserver_p(const res_state statp, const struct sockaddr_in6 *inp)
-{
-	int ns;
-
-	if (inp->sin6_family == AF_INET) {
-	    struct sockaddr_in *in4p = (struct sockaddr_in *) inp;
-	    in_port_t port = in4p->sin_port;
-	    in_addr_t addr = in4p->sin_addr.s_addr;
-
-	    for (ns = 0;  ns < statp->nscount;  ns++) {
-		const struct sockaddr_in *srv =
-		    (struct sockaddr_in *) __res_get_nsaddr (statp, ns);
-
-		if ((srv->sin_family == AF_INET) &&
-		    (srv->sin_port == port) &&
-		    (srv->sin_addr.s_addr == INADDR_ANY ||
-		     srv->sin_addr.s_addr == addr))
-		    return (1);
-	    }
-	} else if (inp->sin6_family == AF_INET6) {
-	    for (ns = 0;  ns < statp->nscount;  ns++) {
-		const struct sockaddr_in6 *srv
-		  = (struct sockaddr_in6 *) __res_get_nsaddr (statp, ns);
-		if ((srv->sin6_family == AF_INET6) &&
-		    (srv->sin6_port == inp->sin6_port) &&
-		    !(memcmp(&srv->sin6_addr, &in6addr_any,
-			     sizeof (struct in6_addr)) &&
-		      memcmp(&srv->sin6_addr, &inp->sin6_addr,
-			     sizeof (struct in6_addr))))
-		    return (1);
-	    }
-	}
-	return (0);
-}
-
-int
-res_isourserver (const struct sockaddr_in *inp)
-{
-  return res_ourserver_p (&_res, (const struct sockaddr_in6 *) inp);
-}
-
-/* int
  * res_nameinquery(name, type, class, buf, eom)
  *	look for (name,type,class) in the query section of packet (buf,eom)
  * requires: