Upgrade unbound library

These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).

1 files changed, 24 insertions, 20 deletions

diff --git a/external/unbound/libunbound/python/doc/examples/example1b.rst b/external/unbound/libunbound/python/doc/examples/example1b.rst
index ea1e6f57d..1adae2cb1 100644
--- a/external/unbound/libunbound/python/doc/examples/example1b.rst
+++ b/external/unbound/libunbound/python/doc/examples/example1b.rst
@@ -1,33 +1,37 @@
 .. _example_reverse_lookup:
 
-==============================
 Reverse DNS lookup
-==============================
+==================
 
-Reverse DNS lookup involves determining the hostname associated with a given IP address.
+Reverse DNS lookup involves determining the hostname associated with a given IP
+address.
 This example shows how reverse lookup can be done using unbound module.
 
 For the reverse DNS records, the special domain in-addr.arpa is reserved. 
-For example, a host name for the IP address 74.125.43.147 can be obtained by issuing a DNS query for the PTR record for address 147.43.125.74.in-addr.arpa.
+For example, a host name for the IP address ``74.125.43.147`` can be obtained
+by issuing a DNS query for the PTR record for address
+``147.43.125.74.in-addr.arpa.``
+
+Source code
+-----------
 
 ::
 
-	#!/usr/bin/python
-	import unbound
-	
-	ctx = unbound.ub_ctx()
-	ctx.resolvconf("/etc/resolv.conf")
-	
-	status, result = ctx.resolve(unbound.reverse("74.125.43.147") + ".in-addr.arpa.", unbound.RR_TYPE_PTR, unbound.RR_CLASS_IN)
-	if status == 0 and result.havedata:
-		print "Result.data:", result.data.domain_list
-	elif status != 0:
-		print "Resolve error:", unbound.ub_strerror(status)
-
-In order to simplify the python code, unbound module contains function which reverses the hostname components. 
-This function is defined as follows::
+    #!/usr/bin/python
+    import unbound
 
-	def reverse(domain):
-		return '.'.join([a for a in domain.split(".")][::-1])
+    ctx = unbound.ub_ctx()
+    ctx.resolvconf("/etc/resolv.conf")
 
+    status, result = ctx.resolve(unbound.reverse("74.125.43.147") + ".in-addr.arpa.", unbound.RR_TYPE_PTR, unbound.RR_CLASS_IN)
+    if status == 0 and result.havedata:
+        print "Result.data:", result.data.domain_list
+    elif status != 0:
+        print "Resolve error:", unbound.ub_strerror(status)
+
+In order to simplify the python code, unbound module contains the
+:meth:`unbound.reverse` function which reverses the hostname components.
+This function is defined as follows::
 
+    def reverse(domain):
+        return '.'.join([a for a in domain.split(".")][::-1])