From 3acf8e092f95233bc3d854e161569487dce83ba2 Mon Sep 17 00:00:00 2001

From: Mark Andrews <marka@isc.org>

Date: Fri, 3 Feb 2017 14:22:03 +1100

Subject: [PATCH] 4567. [port] Call getprotobyname and getservbyname prior to

 calling chroot so that shared libraries get loaded. [RT #44537]

---

 lib/isc/unix/dir.c | 10 ++++++++++

 1 file changed, 10 insertions(+)

diff --git a/lib/isc/unix/dir.c b/lib/isc/unix/dir.c

index 0d64778..ee80f41 100644

--- a/lib/isc/unix/dir.c

+++ b/lib/isc/unix/dir.c

@@ -31,6 +31,7 @@

 #include <isc/dir.h>

 #include <isc/magic.h>

+#include <isc/netdb.h>

 #include <isc/string.h>

 #include <isc/util.h>

@@ -172,6 +173,15 @@ isc_dir_chroot(const char *dirname) {

 	REQUIRE(dirname != NULL);

 #ifdef HAVE_CHROOT

+	/*

+	 * Try to use getservbyname and getprotobyname before chroot.

+	 * If WKS records are used in a zone under chroot, Name Service Switch

+	 * may fail to load library in chroot.

+	 * Do not report errors if it fails, we do not need any result now.

+	 */

+	if (getprotobyname("udp"))

+		(void)getservbyname("domain", "udp");

+

 	if (chroot(dirname) < 0 || chdir("/") < 0)

 		return (isc__errno2result(errno));

-- 

2.9.3