epee: optionally restrict HTTP service to a configurable user agent

This is intended to catch traffic coming from a web browser,
so we avoid issues with a web page sending a transfer RPC to
the wallet. Requiring a particular user agent can act as a
simple password scheme, while we wait for 0MQ and proper
authentication to be merged.

src/daemon/command_parser_executor.cpp

@@ -34,10 +34,11 @@ namespace daemonize {
 t_command_parser_executor::t_command_parser_executor(
     uint32_t ip
   , uint16_t port
+  , const std::string &user_agent
   , bool is_rpc
   , cryptonote::core_rpc_server* rpc_server
   )
-  : m_executor(ip, port, is_rpc, rpc_server)
+  : m_executor(ip, port, user_agent, is_rpc, rpc_server)
 {}
 
 bool t_command_parser_executor::print_peer_list(const std::vector<std::string>& args)

src/daemon/command_parser_executor.h

@@ -49,6 +49,7 @@ public:
   t_command_parser_executor(
       uint32_t ip
     , uint16_t port
+    , const std::string &user_agent
     , bool is_rpc
     , cryptonote::core_rpc_server* rpc_server = NULL
     );

src/daemon/command_server.cpp

@@ -37,10 +37,11 @@ namespace p = std::placeholders;
 t_command_server::t_command_server(
     uint32_t ip
   , uint16_t port
+  , const std::string &user_agent
   , bool is_rpc
   , cryptonote::core_rpc_server* rpc_server
   )
-  : m_parser(ip, port, is_rpc, rpc_server)
+  : m_parser(ip, port, user_agent, is_rpc, rpc_server)
   , m_command_lookup()
   , m_is_rpc(is_rpc)
 {

src/daemon/command_server.h

@@ -54,6 +54,7 @@ public:
   t_command_server(
       uint32_t ip
     , uint16_t port
+    , const std::string &user_agent
     , bool is_rpc = true
     , cryptonote::core_rpc_server* rpc_server = NULL
     );

src/daemon/daemon.cpp

@@ -124,7 +124,7 @@ bool t_daemon::run(bool interactive)
 
     if (interactive)
     {
-      rpc_commands = new daemonize::t_command_server(0, 0, false, mp_internals->rpc.get_server());
+      rpc_commands = new daemonize::t_command_server(0, 0, "", false, mp_internals->rpc.get_server());
       rpc_commands->start_handling(std::bind(&daemonize::t_daemon::stop_p2p, this));
     }
 

src/daemon/main.cpp

@@ -208,6 +208,7 @@ int main(int argc, char const * argv[])
         {
           rpc_port_str = command_line::get_arg(vm, cryptonote::core_rpc_server::arg_testnet_rpc_bind_port);
         }
+        auto user_agent = command_line::get_arg(vm, cryptonote::core_rpc_server::arg_user_agent);
 
         uint32_t rpc_ip;
         uint16_t rpc_port;
@@ -222,7 +223,7 @@ int main(int argc, char const * argv[])
           return 1;
         }
 
-        daemonize::t_command_server rpc_commands{rpc_ip, rpc_port};
+        daemonize::t_command_server rpc_commands{rpc_ip, rpc_port, user_agent};
         if (rpc_commands.process_command_vec(command))
         {
           return 0;

src/daemon/rpc_command_executor.cpp

@@ -92,6 +92,7 @@ namespace {
 t_rpc_command_executor::t_rpc_command_executor(
     uint32_t ip
   , uint16_t port
+  , const std::string &user_agent
   , bool is_rpc
   , cryptonote::core_rpc_server* rpc_server
   )

src/daemon/rpc_command_executor.h

@@ -57,6 +57,7 @@ public:
   t_rpc_command_executor(
       uint32_t ip
     , uint16_t port
+    , const std::string &user_agent
     , bool is_rpc = true
     , cryptonote::core_rpc_server* rpc_server = NULL
     );