* Rewrite support for specific SSL encryption protocols, including

	a. Add a new variable: encryption-protocol-range, which can be
	   used to specify the minimum and maximum versions of the TLS
	   protocol that Alpine will attempt to use to encrypt its
	   communication with the server.
	b. Add support for the Server Name Identification (SNI) extension
	   needed for TLSv1.3.
	c. Remove the DTLS code. It was not being used.

1 files changed, 99 insertions, 0 deletions

diff --git a/configure b/configure
index 238a2ee..0f34f07 100755
--- a/configure
+++ b/configure
@@ -914,6 +914,9 @@ with_ssl_dir
 with_ssl_certs_dir
 with_ssl_include_dir
 with_ssl_lib_dir
+with_encryption_minimum_version
+with_encryption_maximum_version
+with_encryption_range
 with_krb5
 with_krb5_dir
 with_krb5_include_dir
@@ -1756,6 +1759,12 @@ Optional Packages:
   --with-ssl-include-dir=DIR
                           SSL include file path
   --with-ssl-lib-dir=DIR  SSL library path
+  --encryption-minimum-version=VERSION
+                          Minimum SSL encryption version. Default: no_min
+  --encryption-maximum-version=VERSION
+                          Maximum SSL encryption version. Default: no_max
+  --with-encryption-range=VALUE
+                          Default Encryption Range ($alpine_RANGE )
   --without-krb5          Disable Kerberos support
   --with-krb5-dir=DIR     Root of Kerberos lib/include path
   --with-krb5-include-dir=DIR
@@ -18213,6 +18222,96 @@ fi
   fi
 fi
 
+if test "x$alpine_SSLTYPE" != "xnone" ; then
+  alpine_default_SSLMIN="no_min"
+  alpine_default_SSLMAX="no_max"
+  alpine_default_RANGE="${alpine_default_SSLMIN},${alpine_default_SSLMAX}"
+  alpine_ENCRYPTION="$alpine_default_SSLMIN ssl3 tls1 tls1_1 tls1_2 tls1_3 $alpine_default_SSLMAX"
+  alpine_SSLMIN="$alpine_default_SSLMIN"
+  alpine_SSLMAX="$alpine_default_SSLMAX"
+  alpine_RANGE="$alpine_default_RANGE"
+
+# Check whether --with-encryption-minimum-version was given.
+if test "${with_encryption_minimum_version+set}" = set; then :
+  withval=$with_encryption_minimum_version;
+      if test "x$withval" != "xno" ; then
+	alpine_SSLMIN=$withval
+      fi
+
+fi
+
+
+# Check whether --with-encryption-maximum-version was given.
+if test "${with_encryption_maximum_version+set}" = set; then :
+  withval=$with_encryption_maximum_version;
+      if test "x$withval" != "xno" ; then
+	alpine_SSLMAX=$withval
+      fi
+
+fi
+
+  alpine_RANGE="$alpine_SSLMIN $alpine_SSLMAX"
+  for range in ${alpine_RANGE} ; do
+      for encryption in ${alpine_ENCRYPTION} ; do
+	  if test "x$range" = "x$encryption" ; then
+	     if test -z $alpine_min ; then
+		alpine_min="yes"
+	     else
+		alpine_max="yes"
+	     fi
+	  fi
+      done
+  done
+
+  if test -z $alpine_max ; then
+     as_fn_error $? "Unrecognized maximum encryption version: $alpine_max" "$LINENO" 5
+  fi
+
+  if test -z $alpine_min ; then
+     as_fn_error $? "Unrecognized minimum encryption version: $alpine_min" "$LINENO" 5
+  fi
+
+  if test "x$alpine_SSLMIN" != "x$alpine_SSLMAX" ; then
+     alpine_RANGE_FEASIBLE=`echo "$alpine_ENCRYPTION" | sed "s/^.*$alpine_SSLMIN//" | grep "$alpine_SSLMAX"`
+     if test -n "$alpine_RANGE_FEASIBLE" ; then
+	alpine_RANGE="${alpine_SSLMIN},${alpine_SSLMAX}"
+     else
+        { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Reversing order of minimum and maximum encryption" >&5
+$as_echo "$as_me: WARNING: Reversing order of minimum and maximum encryption" >&2;}
+	alpine_RANGE="${alpine_SSLMAX},${alpine_SSLMIN}"
+     fi
+  else
+     if test "x$alpine_SSLMIN" = "x$alpine_default_SSLMIN" ; then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Overriding maximum encryption to default" >&5
+$as_echo "$as_me: WARNING: Overriding maximum encryption to default" >&2;}
+	alpine_SSLMAX="$alpine_default_SSLMAX"
+     fi
+     if test "x$alpine_SSLMAX" = "x$alpine_default_SSLMAX" ; then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Overriding minimum encryption to default" >&5
+$as_echo "$as_me: WARNING: Overriding minimum encryption to default" >&2;}
+	alpine_SSLMIN="$alpine_default_SSLMIN"
+     fi
+     alpine_RANGE="${alpine_SSLMIN},${alpine_SSLMAX}"
+  fi
+
+    dpv=$alpine_RANGE
+
+# Check whether --with-encryption-range was given.
+if test "${with_encryption_range+set}" = set; then :
+  withval=$with_encryption_range;
+	if test "x$withval" != "xno" ; then
+	  dpv=$withval
+	fi
+
+fi
+
+
+cat >>confdefs.h <<_ACEOF
+#define DF_ENCRYPTION_RANGE "$dpv"
+_ACEOF
+
+
+fi
 
 
 # Check whether --with-krb5 was given.