From 2bed3437aee3f9519cdffa75e13cd8dd3306f954 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A1s=20Veres-Szentkir=C3=A1lyi?= <vsza@vsza.hu>
Date: Sun, 1 Jun 2014 01:26:21 +0200
Subject: ssl: parse SNI in received client hello records

---
 lib/ssl/src/ssl_handshake.erl | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'lib/ssl/src/ssl_handshake.erl')

diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
index fc67d2c28d..b018332df1 100644
--- a/lib/ssl/src/ssl_handshake.erl
+++ b/lib/ssl/src/ssl_handshake.erl
@@ -1719,6 +1719,11 @@ dec_hello_extensions(<<?UINT16(?EC_POINT_FORMATS_EXT), ?UINT16(Len),
     dec_hello_extensions(Rest, Acc#hello_extensions{ec_point_formats =
 							#ec_point_formats{ec_point_format_list =
 									      ECPointFormats}});
+
+dec_hello_extensions(<<?UINT16(?SNI_EXT), ?UINT16(Len),
+                ExtData:Len/binary, Rest/binary>>, Acc) ->
+    <<?UINT16(_), NameList/binary>> = ExtData,
+    dec_hello_extensions(Rest, Acc#hello_extensions{sni = dec_sni(NameList)});
 %% Ignore data following the ClientHello (i.e.,
 %% extensions) if not understood.
 
@@ -1731,6 +1736,13 @@ dec_hello_extensions(_, Acc) ->
 dec_hashsign(<<?BYTE(HashAlgo), ?BYTE(SignAlgo)>>) ->
     {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}.
 
+%% Ignore unknown names (only host_name is supported)
+dec_sni(<<?BYTE(?SNI_NAMETYPE_HOST_NAME), ?UINT16(Len),
+                HostName:Len/binary, _/binary>>) ->
+    #sni{hostname = binary_to_list(HostName)};
+dec_sni(<<?BYTE(_), ?UINT16(Len), _:Len, Rest/binary>>) -> dec_sni(Rest);
+dec_sni(_) -> undefined.
+
 decode_next_protocols({next_protocol_negotiation, Protocols}) ->
     decode_next_protocols(Protocols, []).
 decode_next_protocols(<<>>, Acc) ->
-- 
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