From 8fd2fabef8fd580eb545db2e3d4efb05ff5f900e Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Fri, 2 Mar 2012 22:52:01 +0900
Subject: [PATCH] Made spdylay_select_next_protocol() return SPDY protocol
 version if one of SPDY versions is selected.

---
 examples/spdylay_ssl.cc        |  2 +-
 lib/includes/spdylay/spdylay.h | 13 +++++++++----
 lib/spdylay_npn.c              |  7 ++++---
 tests/spdylay_npn_test.c       |  4 ++--
 4 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/examples/spdylay_ssl.cc b/examples/spdylay_ssl.cc
index 339b51c..f8289b9 100644
--- a/examples/spdylay_ssl.cc
+++ b/examples/spdylay_ssl.cc
@@ -472,7 +472,7 @@ int select_next_proto_cb(SSL* ssl,
   }
   std::string& next_proto = *(std::string*)arg;
   if(next_proto.empty()) {
-    if(spdylay_select_next_protocol(out, outlen, in, inlen) != 1) {
+    if(spdylay_select_next_protocol(out, outlen, in, inlen) <= 0) {
       std::cerr << "Server did not advertise spdy/2 or spdy/3 protocol."
                 << std::endl;
       abort();
diff --git a/lib/includes/spdylay/spdylay.h b/lib/includes/spdylay/spdylay.h
index 8bfd1f5..03ec049 100644
--- a/lib/includes/spdylay/spdylay.h
+++ b/lib/includes/spdylay/spdylay.h
@@ -758,8 +758,11 @@ int spdylay_submit_goaway(spdylay_session *session, uint32_t status_code);
  *
  * The selection algorithm is as follows:
  *
- * 1. If server's list contains "spdy/2", this function selects
- *    "spdy/2" and returns 1. The following steps are not taken.
+ * 1. If server's list contains SPDY versions the spdylay library
+ *    supports, this function selects one of them and returns its SPDY
+ *    protocol version which can be used directly with
+ *    spdylay_session_client_new() and spdylay_session_server_new()
+ *    . The following steps are not taken.
  *
  * 2. If server's list contains "http/1.1", this function selects
  *    "http/1.1" and returns 0. The following step is not taken.
@@ -785,8 +788,10 @@ int spdylay_submit_goaway(spdylay_session *session, uint32_t status_code);
  *                                 const unsigned char *in, unsigned int inlen,
  *                                 void *arg)
  * {
- *   if (spdylay_select_next_protocol(out, outlen, in, inlen) == 1) {
- *     ((MyType*)arg)->spdy_version = spdylay_npn_get_version(*out, *outlen);
+ *   int version;
+ *   version = spdylay_select_next_protocol(out, outlen, in, inlen);
+ *   if(version > 0) {
+ *     ((MyType*)arg)->spdy_version = version;
  *   }
  *   return SSL_TLSEXT_ERR_OK;
  * }
diff --git a/lib/spdylay_npn.c b/lib/spdylay_npn.c
index a7f75b1..73f664c 100644
--- a/lib/spdylay_npn.c
+++ b/lib/spdylay_npn.c
@@ -29,6 +29,7 @@
 typedef struct {
   const unsigned char *proto;
   uint8_t len;
+  uint16_t version;
 } spdylay_npn_proto;
 
 int spdylay_select_next_protocol(unsigned char **out, unsigned char *outlen,
@@ -37,8 +38,8 @@ int spdylay_select_next_protocol(unsigned char **out, unsigned char *outlen,
   int http_selected = 0;
   unsigned int i = 0;
   static const spdylay_npn_proto proto_list[] = {
-    { (const unsigned char*)"spdy/2", 6 },
-    { (const unsigned char*)"spdy/3", 6 }
+    { (const unsigned char*)"spdy/2", 6, SPDYLAY_PROTO_SPDY2 },
+    { (const unsigned char*)"spdy/3", 6, SPDYLAY_PROTO_SPDY3 }
   };
   for(; i < inlen; i += in[i]+1) {
     int j;
@@ -47,7 +48,7 @@ int spdylay_select_next_protocol(unsigned char **out, unsigned char *outlen,
          memcmp(&in[i+1], proto_list[j].proto, in[i]) == 0) {
         *out = (unsigned char*)&in[i+1];
         *outlen = in[i];
-        return 1;
+        return proto_list[j].version;
       }
     }
     if(in[i] == 8 && memcmp(&in[i+1], "http/1.1", in[i]) == 0) {
diff --git a/tests/spdylay_npn_test.c b/tests/spdylay_npn_test.c
index 5f8ce42..3b28cc3 100644
--- a/tests/spdylay_npn_test.c
+++ b/tests/spdylay_npn_test.c
@@ -36,8 +36,8 @@ static void spdy2()
   };
   unsigned char outlen;
   unsigned char* out;
-  CU_ASSERT(1 == spdylay_select_next_protocol(&out, &outlen,
-                                              spdy, sizeof(spdy)));
+  CU_ASSERT(SPDYLAY_PROTO_SPDY2 ==
+            spdylay_select_next_protocol(&out, &outlen, spdy, sizeof(spdy)));
   CU_ASSERT(6 == outlen);
   CU_ASSERT(memcmp("spdy/2", out, outlen) == 0);
 }