Add first draft of print_client and print_client_tls

Author: Peter Thorson

SConstruct

@@ -234,10 +234,14 @@ echo_server = SConscript('#/examples/echo_server/SConscript',variant_dir = build
 # echo_client
 echo_client = SConscript('#/examples/echo_client/SConscript',variant_dir = builddir + 'echo_client',duplicate = 0)
 
+# print_client
+print_client = SConscript('#/examples/print_client/SConscript',variant_dir = builddir + 'print_client',duplicate = 0)
+
 # echo_server_tls
 if tls_build:
     echo_server_tls = SConscript('#/examples/echo_server_tls/SConscript',variant_dir = builddir + 'echo_server_tls',duplicate = 0)
     echo_server_both = SConscript('#/examples/echo_server_both/SConscript',variant_dir = builddir + 'echo_server_both',duplicate = 0)
+    print_client_tls = SConscript('#/examples/print_client_tls/SConscript',variant_dir = builddir + 'print_client_tls',duplicate = 0)
 
 # broadcast_server
 broadcast_server = SConscript('#/examples/broadcast_server/SConscript',variant_dir = builddir + 'broadcast_server',duplicate = 0)

changelog.md

@@ -1,4 +1,9 @@
 HEAD
+- Examples: Add print_client example. This demonstrates a minimal non-TLS
+  client that connects to a server and prints out the messages it receives.
+- Examples: Add print_client_tls example. This demonstrates a minimal TLS
+  client, including basic support via Asio+OpenSSL for certificate chain
+  and hostname verification.
 - Improvement: Move the socket_init_handler to execute as a part of init_asio
   rather than connection pre_init. This allows setting of socket options prior
   to the bind/listen/accept system calls. Thank you ChristianRobl3D for

examples/echo_server_tls/server.pem

@@ -1,55 +1,57 @@
------BEGIN RSA PRIVATE KEY-----
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------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
-

examples/print_client/CMakeLists.txt

@@ -0,0 +1,12 @@
+
+file (GLOB SOURCE_FILES *.cpp)
+file (GLOB HEADER_FILES *.hpp)
+
+init_target (print_client)
+
+build_executable (${TARGET_NAME} ${SOURCE_FILES} ${HEADER_FILES})
+
+link_boost ()
+final_target ()
+
+set_target_properties(${TARGET_NAME} PROPERTIES FOLDER "examples")

examples/print_client/SConscript

@@ -0,0 +1,23 @@
+## Print client example
+##
+
+Import('env')
+Import('env_cpp11')
+Import('boostlibs')
+Import('platform_libs')
+Import('polyfill_libs')
+
+env = env.Clone ()
+env_cpp11 = env_cpp11.Clone ()
+
+prgs = []
+
+# if a C++11 environment is available build using that, otherwise use boost
+if env_cpp11.has_key('WSPP_CPP11_ENABLED'):
+   ALL_LIBS = boostlibs(['system'],env_cpp11) + [platform_libs] + [polyfill_libs]
+   prgs += env_cpp11.Program('print_client', ["print_client.cpp"], LIBS = ALL_LIBS)
+else:
+   ALL_LIBS = boostlibs(['system'],env) + [platform_libs] + [polyfill_libs]
+   prgs += env.Program('print_client', ["print_client.cpp"], LIBS = ALL_LIBS)
+
+Return('prgs')

examples/print_client/print_client.cpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2016, Peter Thorson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the WebSocket++ Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <websocketpp/config/asio_no_tls_client.hpp>
+#include <websocketpp/client.hpp>
+
+#include <iostream>
+
+typedef websocketpp::client<websocketpp::config::asio_client> client;
+
+void on_message(websocketpp::connection_hdl, client::message_ptr msg) {
+	std::cout << msg->get_payload() << std::endl;
+}
+
+int main(int argc, char* argv[]) {
+    client c;
+
+    std::string uri = "ws://localhost:9002";
+
+    if (argc == 2) {
+        uri = argv[1];
+    }
+
+	try {
+        // Set logging to be pretty verbose (everything except message payloads)
+        c.set_access_channels(websocketpp::log::alevel::all);
+        c.clear_access_channels(websocketpp::log::alevel::frame_payload);
+        c.set_error_channels(websocketpp::log::elevel::all);
+
+        // Initialize ASIO
+        c.init_asio();
+
+        // Register our message handler
+        c.set_message_handler(&on_message);
+
+        websocketpp::lib::error_code ec;
+        client::connection_ptr con = c.get_connection(uri, ec);
+        if (ec) {
+            std::cout << "could not create connection because: " << ec.message() << std::endl;
+            return 0;
+        }
+
+        // Note that connect here only requests a connection. No network messages are
+        // exchanged until the event loop starts running in the next line.
+        c.connect(con);
+
+        // Start the ASIO io_service run loop
+        // this will cause a single connection to be made to the server. c.run()
+        // will exit when this connection is closed.
+        c.run();
+    } catch (websocketpp::exception const & e) {
+        std::cout << e.what() << std::endl;
+    }
+}

examples/print_client_tls/CMakeLists.txt

@@ -0,0 +1,17 @@
+
+file (GLOB SOURCE_FILES *.cpp)
+file (GLOB HEADER_FILES *.hpp)
+
+if (OPENSSL_FOUND)
+
+init_target (print_client_tls)
+
+build_executable (${TARGET_NAME} ${SOURCE_FILES} ${HEADER_FILES})
+
+link_boost ()
+link_openssl()
+final_target ()
+
+set_target_properties(${TARGET_NAME} PROPERTIES FOLDER "examples")
+
+endif()

examples/print_client_tls/SConscript

@@ -0,0 +1,24 @@
+## Print client tls example
+##
+
+Import('env')
+Import('env_cpp11')
+Import('boostlibs')
+Import('platform_libs')
+Import('polyfill_libs')
+Import('tls_libs')
+
+env = env.Clone ()
+env_cpp11 = env_cpp11.Clone ()
+
+prgs = []
+
+# if a C++11 environment is available build using that, otherwise use boost
+if env_cpp11.has_key('WSPP_CPP11_ENABLED'):
+   ALL_LIBS = boostlibs(['system'],env_cpp11) + [platform_libs] + [polyfill_libs] + [tls_libs]
+   prgs += env_cpp11.Program('print_client_tls', ["print_client_tls.cpp"], LIBS = ALL_LIBS)
+else:
+   ALL_LIBS = boostlibs(['system'],env) + [platform_libs] + [polyfill_libs] + [tls_libs]
+   prgs += env.Program('print_client_tls', ["print_client_tls.cpp"], LIBS = ALL_LIBS)
+
+Return('prgs')

examples/print_client_tls/ca-chain.cert.pem

@@ -0,0 +1,66 @@
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