Improved CMake build system. Updated readme.

The CMake build system now uses a relative path for modules, and supports a 'USE_SSL' option to optionally link in mbedtls and enable SSL support.

The readme now provides SSL examples.

CMakeLists.txt

@@ -1,10 +1,14 @@
-cmake_minimum_required(VERSION 3.6)
+cmake_minimum_required(VERSION 3.5)
 project(frnetlib)
 
-set( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} /home/fred/ClionProjects/frnetlib/cmake_modules)
+set( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules)
+option(USE_SSL "Use SSL" ON)
 
-FIND_PACKAGE(MBEDTLS)
-INCLUDE_DIRECTORIES(${MBEDTLS_INCLUDE_DIR})
+if(USE_SSL)
+    FIND_PACKAGE(MBEDTLS)
+    INCLUDE_DIRECTORIES(${MBEDTLS_INCLUDE_DIR})
+    add_definitions(-DSSL_ENABLED)
+endif()
 
 include_directories(include)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -m64 -fPIC -pthread -lmbedtls -lmbedx509 -lmbedcrypto")
@@ -12,4 +16,6 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -m64 -fPIC -pthread -lmbedtls
 set(SOURCE_FILES main.cpp src/TcpSocket.cpp include/TcpSocket.h src/TcpListener.cpp include/TcpListener.h src/Socket.cpp include/Socket.h src/Packet.cpp include/Packet.h include/NetworkEncoding.h src/SocketSelector.cpp include/SocketSelector.h src/HttpSocket.cpp include/HttpSocket.h src/HttpRequest.cpp include/HttpRequest.h src/HttpResponse.cpp include/HttpResponse.h src/Http.cpp include/Http.h src/SSLSocket.cpp include/SSLSocket.h src/SSLListener.cpp include/SSLListener.h include/SSLContext.h)
 add_executable(frnetlib ${SOURCE_FILES})
 
-TARGET_LINK_LIBRARIES(frnetlib ${MBEDTLS_LIBRARIES} -lmbedtls -lmbedx509 -lmbedcrypto -static)
+if(USE_SSL)
+    TARGET_LINK_LIBRARIES(frnetlib ${MBEDTLS_LIBRARIES} -lmbedtls -lmbedx509 -lmbedcrypto)
+endif()

README.md

@@ -39,6 +39,27 @@ if(listener.accept(client) != fr::Socket::Success)
 ```
 Here we create a new fr::TcpListener, which is used to listen for incomming connections and accept them. Calling fr::TcpListener::listen(port) will bind the listener to a port, allowing you to receive connections on that port. Next a new fr::TcpSocket is created, which is where the accepted connection is stored, to send data through the new connection, we do so though 'client' from now on. fr::TcpListener's can accept as many new connections as you want. You don't need a new one for each client. 
 
+# Using SSL
+
+```c++
+#include <SSLSocket.h>
+#include <SSLContext.h>
+#include <SSLListener.h>
+
+std::shared_ptr<fr::SSLContext> ssl_context(new fr::SSLContext("certs.crt")); //Creates a new 'SSL' context. 'certs.txt' should be a list of your trusted public keys.
+
+fr::SSLListener listener(ssl_context, "crt_path", "pem_path", "private_key_path"); //This is the SSL equivilent to fr::TcpListener
+
+fr::SSLSocket socket(ssl_context); //This is the SSL equivilent to fr::TcpSocket
+
+fr::HttpSocket<fr::SSLSocket> socket(ssl_context); //This is the SSL equivilent for a HTTP socket.
+
+```
+As you've probably noticed, everything unencrypted has it's equivilent encrypted counter part, usually just by replacing 'TCP' with 'SSL' and providing an SSLContext object.
+fr::SSLContext stores SSL information which needn't be duplicated across each socket and listener, such as the random number generator, and public key list. It is *important* to build mbedtls with thread protection enabled, if your program is multithreaded. This SSLContext object can then be passed to any SSL sockets or listeners which you may create.
+
+SSLListener accepts a lot more arguments than its unencrypted counterpart, TcpListener, and it needs the filepaths to your SSL certificates and keys to properly authenticate with clients. 
+
 # Sending packets:
 
 ```c++

include/SSLContext.h

@@ -5,8 +5,7 @@
 #ifndef FRNETLIB_SSLCONTEXT_H
 #define FRNETLIB_SSLCONTEXT_H
 
-#define USE_SSL
-#ifdef USE_SSL
+#ifdef SSL_ENABLED
 
 #include <mbedtls/x509_crt.h>
 #include <mbedtls/ctr_drbg.h>
@@ -56,7 +55,7 @@ namespace fr
 
     };
 }
-#endif // USE_SSSL
+#endif // SSL_ENABLED
 
 
 #endif //FRNETLIB_SSLCONTEXT_H

include/SSLListener.h

@@ -5,8 +5,6 @@
 #ifndef FRNETLIB_SSLLISTENER_H
 #define FRNETLIB_SSLLISTENER_H
 
-#define SSL_ENABLED
-
 #ifdef SSL_ENABLED
 
 #include <mbedtls/net_sockets.h>

include/SSLSocket.h

@@ -5,8 +5,6 @@
 #ifndef FRNETLIB_SSL_SOCKET_H
 #define FRNETLIB_SSL_SOCKET_H
 
-#define SSL_ENABLED
-
 #ifdef SSL_ENABLED
 
 #include "TcpSocket.h"
@@ -19,52 +17,6 @@
 #include <mbedtls/error.h>
 #include <mbedtls/certs.h>
 
-const std::string certs =
-        "-----BEGIN CERTIFICATE-----\n"
-        "MIIHyTCCBbGgAwIBAgIBATANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW\n"
-        "MBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwg\n"
-        "Q2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3RhcnRDb20gQ2VydGlmaWNh\n"
-        "dGlvbiBBdXRob3JpdHkwHhcNMDYwOTE3MTk0NjM2WhcNMzYwOTE3MTk0NjM2WjB9\n"
-        "MQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMi\n"
-        "U2VjdXJlIERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3Rh\n"
-        "cnRDb20gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwggIiMA0GCSqGSIb3DQEBAQUA\n"
-        "A4ICDwAwggIKAoICAQDBiNsJvGxGfHiflXu1M5DycmLWwTYgIiRezul38kMKogZk\n"
-        "pMyONvg45iPwbm2xPN1yo4UcodM9tDMr0y+v/uqwQVlntsQGfQqedIXWeUyAN3rf\n"
-        "OQVSWff0G0ZDpNKFhdLDcfN1YjS6LIp/Ho/u7TTQEceWzVI9ujPW3U3eCztKS5/C\n"
-        "Ji/6tRYccjV3yjxd5srhJosaNnZcAdt0FCX+7bWgiA/deMotHweXMAEtcnn6RtYT\n"
-        "Kqi5pquDSR3l8u/d5AGOGAqPY1MWhWKpDhk6zLVmpsJrdAfkK+F2PrRt2PZE4XNi\n"
-        "HzvEvqBTViVsUQn3qqvKv3b9bZvzndu/PWa8DFaqr5hIlTpL36dYUNk4dalb6kMM\n"
-        "Av+Z6+hsTXBbKWWc3apdzK8BMewM69KN6Oqce+Zu9ydmDBpI125C4z/eIT574Q1w\n"
-        "+2OqqGwaVLRcJXrJosmLFqa7LH4XXgVNWG4SHQHuEhANxjJ/GP/89PrNbpHoNkm+\n"
-        "Gkhpi8KWTRoSsmkXwQqQ1vp5Iki/untp+HDH+no32NgN0nZPV/+Qt+OR0t3vwmC3\n"
-        "Zzrd/qqc8NSLf3Iizsafl7b4r4qgEKjZ+xjGtrVcUjyJthkqcwEKDwOzEmDyei+B\n"
-        "26Nu/yYwl/WL3YlXtq09s68rxbd2AvCl1iuahhQqcvbjM4xdCUsT37uMdBNSSwID\n"
-        "AQABo4ICUjCCAk4wDAYDVR0TBAUwAwEB/zALBgNVHQ8EBAMCAa4wHQYDVR0OBBYE\n"
-        "FE4L7xqkQFulF2mHMMo0aEPQQa7yMGQGA1UdHwRdMFswLKAqoCiGJmh0dHA6Ly9j\n"
-        "ZXJ0LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMCugKaAnhiVodHRwOi8vY3Js\n"
-        "LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMIIBXQYDVR0gBIIBVDCCAVAwggFM\n"
-        "BgsrBgEEAYG1NwEBATCCATswLwYIKwYBBQUHAgEWI2h0dHA6Ly9jZXJ0LnN0YXJ0\n"
-        "Y29tLm9yZy9wb2xpY3kucGRmMDUGCCsGAQUFBwIBFilodHRwOi8vY2VydC5zdGFy\n"
-        "dGNvbS5vcmcvaW50ZXJtZWRpYXRlLnBkZjCB0AYIKwYBBQUHAgIwgcMwJxYgU3Rh\n"
-        "cnQgQ29tbWVyY2lhbCAoU3RhcnRDb20pIEx0ZC4wAwIBARqBl0xpbWl0ZWQgTGlh\n"
-        "YmlsaXR5LCByZWFkIHRoZSBzZWN0aW9uICpMZWdhbCBMaW1pdGF0aW9ucyogb2Yg\n"
-        "dGhlIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5IFBvbGljeSBhdmFp\n"
-        "bGFibGUgYXQgaHR0cDovL2NlcnQuc3RhcnRjb20ub3JnL3BvbGljeS5wZGYwEQYJ\n"
-        "YIZIAYb4QgEBBAQDAgAHMDgGCWCGSAGG+EIBDQQrFilTdGFydENvbSBGcmVlIFNT\n"
-        "TCBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTANBgkqhkiG9w0BAQUFAAOCAgEAFmyZ\n"
-        "9GYMNPXQhV59CuzaEE44HF7fpiUFS5Eyweg78T3dRAlbB0mKKctmArexmvclmAk8\n"
-        "jhvh3TaHK0u7aNM5Zj2gJsfyOZEdUauCe37Vzlrk4gNXcGmXCPleWKYK34wGmkUW\n"
-        "FjgKXlf2Ysd6AgXmvB618p70qSmD+LIU424oh0TDkBreOKk8rENNZEXO3SipXPJz\n"
-        "ewT4F+irsfMuXGRuczE6Eri8sxHkfY+BUZo7jYn0TZNmezwD7dOaHZrzZVD1oNB1\n"
-        "ny+v8OqCQ5j4aZyJecRDjkZy42Q2Eq/3JR44iZB3fsNrarnDy0RLrHiQi+fHLB5L\n"
-        "EUTINFInzQpdn4XBidUaePKVEFMy3YCEZnXZtWgo+2EuvoSoOMCZEoalHmdkrQYu\n"
-        "L6lwhceWD3yJZfWOQ1QOq92lgDmUYMA0yZZwLKMS9R9Ie70cfmu3nZD0Ijuu+Pwq\n"
-        "yvqCUqDvr0tVk+vBtfAii6w0TiYiBKGHLHVKt+V9E9e4DGTANtLJL4YSjCMJwRuC\n"
-        "O3NJo2pXh5Tl1njFmUNj403gdy3hZZlyaQQaRwnmDwFWJPsfvw55qVguucQJAX6V\n"
-        "um0ABj6y6koQOdjQK/W/7HW/lwLFCRsI3FU34oH7N4RDYiDK51ZLZer+bMEkkySh\n"
-        "NOsF/5oirpt9P/FlUQqmMGqz9IgcgA38corog14=\n"
-        "-----END CERTIFICATE-----";
-
 namespace fr
 {
     class SSLSocket : public Socket

main.cpp

@@ -8,6 +8,8 @@
 #include "HttpRequest.h"
 #include "HttpResponse.h"
 #include "SSLSocket.h"
+#include "SSLContext.h"
+#include "SSLListener.h"
 
 int main()
 {