From 808b584d22106828aaaa3f2a52b1d076b6e66040 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Thu, 11 Sep 2014 08:09:34 +0000
Subject: [PATCH] provide dn_skipname

---
 configure.ac                   |  2 +-
 src/libreplace/__dn_skipname.c | 87 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 src/libreplace/__dn_skipname.c

diff --git a/configure.ac b/configure.ac
index 63e398c..739da3b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -274,7 +274,7 @@ AC_CHECK_FUNCS([strcasecmp strncasecmp strspn strtoul])
 AC_CHECK_FUNCS([gethostbyname inet_ntoa select strrchr strstr strtol])
 
 AC_REPLACE_FUNCS([getopt_long_only strncasecmp])
-AC_REPLACE_FUNCS([__ns_initparse __ns_name_uncompress __ns_msg_getflag])
+AC_REPLACE_FUNCS([__ns_initparse __ns_name_uncompress __ns_msg_getflag __dn_skipname])
 dnl Magnus Holmgren says this avoids linking a private function
 AC_LIBOBJ([__ns_get16])
 
diff --git a/src/libreplace/__dn_skipname.c b/src/libreplace/__dn_skipname.c
new file mode 100644
index 0000000..88d48b5
--- /dev/null
+++ b/src/libreplace/__dn_skipname.c
@@ -0,0 +1,87 @@
+/* taken from OpenBSD source */
+/*
+ * ++Copyright++ 1985, 1993
+ * -
+ * Copyright (c) 1985, 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.
+ * 3. 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.
+ * -
+ * --Copyright--
+ */
+
+/*
+ * Skip over a compressed domain name. Return the size or -1.
+ */
+#include <sys/types.h>
+#include <resolv.h>
+
+int
+__dn_skipname(const u_char *comp_dn, const u_char *eom)
+{
+	const u_char *cp;
+	int n;
+
+	cp = comp_dn;
+	while (cp < eom && (n = *cp++)) {
+		/*
+		 * check for indirection
+		 */
+		switch (n & INDIR_MASK) {
+		case 0:			/* normal case, n == len */
+			cp += n;
+			continue;
+		case INDIR_MASK:	/* indirection */
+			cp++;
+			break;
+		default:		/* illegal type */
+			return (-1);
+		}
+		break;
+	}
+	if (cp > eom)
+		return (-1);
+	return (cp - comp_dn);
+}
+
+
-- 
2.1.0

