From 68cde058f66b3c3470f7e7d7068e40b236af6889 Mon Sep 17 00:00:00 2001
From: "Hongli Lai (Phusion)" <hongli@phusion.nl>
Date: Thu, 4 Nov 2010 12:54:58 +0100
Subject: [PATCH] SNI: set name to custom Host header

OpenSSL SNI host name should be set to the custom Host header, if the
user provided one.
---
 lib/ssluse.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/lib/ssluse.c b/lib/ssluse.c
index 474bc9a33..fce8680e8 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -1429,6 +1429,8 @@ ossl_connect_step1(struct connectdata *conn,
   curl_socket_t sockfd = conn->sock[sockindex];
   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+  const char *hostname;
+  bool hostname_static;
   bool sni;
 #ifdef ENABLE_IPV6
   struct in6_addr addr;
@@ -1641,14 +1643,28 @@ ossl_connect_step1(struct connectdata *conn,
   connssl->server_cert = 0x0;
 
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
-  if ((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
+  hostname = Curl_checkheaders(data, "Host:");
+  if(hostname && (!data->state.this_is_a_follow ||
+                  Curl_raw_equal(data->state.first_host, conn->host.name))) {
+    hostname_static = FALSE;
+    hostname = Curl_copy_header_value(hostname);
+    if(!hostname) {
+      return CURLE_OUT_OF_MEMORY;
+    }
+  } else {
+    hostname_static = TRUE;
+    hostname = conn->host.name;
+  }
+  if ((0 == Curl_inet_pton(AF_INET, hostname, &addr)) &&
 #ifdef ENABLE_IPV6
-      (0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
+      (0 == Curl_inet_pton(AF_INET6, hostname, &addr)) &&
 #endif
       sni &&
-      !SSL_set_tlsext_host_name(connssl->handle, conn->host.name))
+      !SSL_set_tlsext_host_name(connssl->handle, hostname))
     infof(data, "WARNING: failed to configure server name indication (SNI) "
           "TLS extension\n");
+  if(!hostname_static)
+    free((char *) hostname);
 #endif
 
   /* Check if there's a cached ID we can/should use here! */