added error in case openssl is missing

examples/libev.cpp

@@ -4,7 +4,7 @@
  *  Test program to check AMQP functionality based on LibEV
  * 
  *  @author Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
- *  @copyright 2015 - 2017 Copernica BV
+ *  @copyright 2015 - 2018 Copernica BV
  */
 
 /**
@@ -13,6 +13,7 @@
 #include <ev.h>
 #include <amqpcpp.h>
 #include <amqpcpp/libev.h>
+#include <openssl/ssl.h>
 
 /**
  *  Custom handler
@@ -65,7 +66,7 @@ int main()
     MyHandler handler(loop);
 
     // init the SSL library
-    SSL_library_init();
+//    SSL_library_init();
 
     // make a connection
     AMQP::Address address("amqps://guest:guest@localhost/");

src/linux_tcp/openssl.h

@@ -22,10 +22,16 @@
 /**
  *  Begin of namespace
  */
-namespace Copernica { namespace OpenSSL {
+namespace AMQP { namespace OpenSSL {
-    
+
 /**
- *	List of all methods that we need
+ *  Function to check if openssl is loaded
+ *  @return bool
+ */
+bool valid();
+
+/**
+ *  List of all wrapper methods that are in use inside AMQP-CPP
  */
 SSL_CTX *SSL_CTX_new(const SSL_METHOD *method);
 SSL     *SSL_new(SSL_CTX *ctx);

src/linux_tcp/sslhandshake.h

@@ -158,7 +158,7 @@ public:
         if (fd != _socket) return this;
 
         // start the ssl handshake
-        int result = SSL_do_handshake(_ssl);
+        int result = OpenSSL::SSL_do_handshake(_ssl);
                 
         // if the connection succeeds, we can move to the ssl-connected state
         if (result == 1) return nextstate(new SslConnected(_connection, _socket, _ssl, std::move(_out), _handler));

src/linux_tcp/tcpresolver.h

@@ -20,7 +20,8 @@
 #include "tcpstate.h"
 #include "tcpclosed.h"
 #include "tcpconnected.h"
-//#include "sslhandshake.h"
+#include "openssl.h"
+#include "sslhandshake.h"
 #include <thread>
 
 /**
@@ -91,6 +92,9 @@ private:
         // prevent exceptions
         try
         {
+            // check if we support openssl in the first place
+            if (!OpenSSL::valid()) throw std::runtime_error("Secure connection cannot be established: the application has no access to openssl");
+            
             // get address info
             AddressInfo addresses(_hostname.data(), _port);
     
@@ -190,7 +194,8 @@ public:
         if (_socket >= 0) 
         {
             // if we need a secure connection, we move to the tls handshake
-            //if (_secure) return new SslHandshake(_connection, _socket, _hostname, std::move(_buffer), _handler);
+            // @todo catch exception
+            if (_secure) return new SslHandshake(_connection, _socket, _hostname, std::move(_buffer), _handler);
             
             // otherwise we have a valid regular tcp connection
             return new TcpConnected(_connection, _socket, std::move(_buffer), _handler);