implement ss shell command on game server

src/ReceiveCommands.cc

@@ -4081,3 +4081,32 @@ void on_command(shared_ptr<ServerState> s, shared_ptr<Client> c,
     on_unimplemented_command(s, c, command, flag, data);
   }
 }
+
+void on_command_with_header(shared_ptr<ServerState> s, shared_ptr<Client> c,
+    string& data) {
+  switch (c->version()) {
+    case GameVersion::DC:
+    case GameVersion::GC:
+    case GameVersion::XB: {
+      auto& header = check_size_t<PSOCommandHeaderDCV3>(data,
+          sizeof(PSOCommandHeaderDCV3), 0xFFFF);
+      on_command(s, c, header.command, header.flag, data.substr(sizeof(header)));
+      break;
+    }
+    case GameVersion::PC:
+    case GameVersion::PATCH: {
+      auto& header = check_size_t<PSOCommandHeaderPC>(data,
+          sizeof(PSOCommandHeaderPC), 0xFFFF);
+      on_command(s, c, header.command, header.flag, data.substr(sizeof(header)));
+      break;
+    }
+    case GameVersion::BB: {
+      auto& header = check_size_t<PSOCommandHeaderBB>(data,
+          sizeof(PSOCommandHeaderBB), 0xFFFF);
+      on_command(s, c, header.command, header.flag, data.substr(sizeof(header)));
+      break;
+    }
+    default:
+      throw logic_error("unimplemented game version in on_command_with_header");
+  }
+}

src/ReceiveCommands.hh

@@ -22,3 +22,5 @@ void on_disconnect(std::shared_ptr<ServerState> s,
     std::shared_ptr<Client> c);
 void on_command(std::shared_ptr<ServerState> s, std::shared_ptr<Client> c,
     uint16_t command, uint32_t flag, const std::string& data);
+void on_command_with_header(std::shared_ptr<ServerState> s,
+    std::shared_ptr<Client> c, std::string& data);

src/ServerShell.cc

@@ -6,6 +6,7 @@
 
 #include <phosg/Strings.hh>
 
+#include "ReceiveCommands.hh"
 #include "ServerState.hh"
 #include "SendCommands.hh"
 #include "StaticGameData.hh"
@@ -508,10 +509,6 @@ session with ID 17205AE4, run the command `on 17205AE4 sc 1D 00 04 00`.\n\
       }
 
     } else {
-      if (command_name [1] == 's') {
-        throw runtime_error("cannot send to server in non-proxy session");
-      }
-
       shared_ptr<Client> c;
       if (session_name.empty()) {
         c = this->state->game_server->get_client();
@@ -528,7 +525,11 @@ session with ID 17205AE4, run the command `on 17205AE4 sc 1D 00 04 00`.\n\
       }
 
       if (c) {
-        send_command_with_header(c->channel, data.data(), data.size());
+        if (command_name[1] == 's') {
+          on_command_with_header(this->state, c, data);
+        } else {
+          send_command_with_header(c->channel, data.data(), data.size());
+        }
       } else {
         throw runtime_error("no client available");
       }