SDL: add multiplayer options (#3072)

* SDL: Add multiplayer options

* SDL: Make the exit conditions LOG_ERROR

* fixup! SDL: Make the exit conditions LOG_ERROR

src/citra/citra.cpp

@@ -4,6 +4,7 @@
 
 #include <iostream>
 #include <memory>
+#include <regex>
 #include <string>
 #include <thread>
 
@@ -39,12 +40,14 @@
 #include "core/hle/service/am/am.h"
 #include "core/loader/loader.h"
 #include "core/settings.h"
+#include "network/network.h"
 
 static void PrintHelp(const char* argv0) {
-    std::cout << "Usage: " << argv0
-              << " [options] <filename>\n"
+    std::cout << "Usage: " << argv0 << " [options] <filename>\n"
                                        "-g, --gdbport=NUMBER Enable gdb stub on port NUMBER\n"
                                        "-i, --install=FILE    Installs a specified CIA file\n"
+                                       "-m, --multiplayer=nick:password@address:port"
+                                       " Nickname, password, address and port for multiplayer\n"
                                        "-h, --help           Display this help and exit\n"
                                        "-v, --version        Output version information and exit\n";
 }
@@ -53,6 +56,53 @@ static void PrintVersion() {
     std::cout << "Citra " << Common::g_scm_branch << " " << Common::g_scm_desc << std::endl;
 }
 
+static void OnStateChanged(const Network::RoomMember::State& state) {
+    switch (state) {
+    case Network::RoomMember::State::Idle:
+        LOG_DEBUG(Network, "Network is idle");
+        break;
+    case Network::RoomMember::State::Joining:
+        LOG_DEBUG(Network, "Connection sequence to room started");
+        break;
+    case Network::RoomMember::State::Joined:
+        LOG_DEBUG(Network, "Successfully joined to the room");
+        break;
+    case Network::RoomMember::State::LostConnection:
+        LOG_DEBUG(Network, "Lost connection to the room");
+        break;
+    case Network::RoomMember::State::CouldNotConnect:
+        LOG_ERROR(Network, "State: CouldNotConnect");
+        exit(1);
+        break;
+    case Network::RoomMember::State::NameCollision:
+        LOG_ERROR(
+            Network,
+            "You tried to use the same nickname then another user that is connected to the Room");
+        exit(1);
+        break;
+    case Network::RoomMember::State::MacCollision:
+        LOG_ERROR(Network, "You tried to use the same MAC-Address then another user that is "
+                           "connected to the Room");
+        exit(1);
+        break;
+    case Network::RoomMember::State::WrongPassword:
+        LOG_ERROR(Network, "Room replied with: Wrong password");
+        exit(1);
+        break;
+    case Network::RoomMember::State::WrongVersion:
+        LOG_ERROR(Network,
+                  "You are using a different version then the room you are trying to connect to");
+        exit(1);
+        break;
+    default:
+        break;
+    }
+}
+
+static void OnMessageReceived(const Network::ChatEntry& msg) {
+    std::cout << std::endl << msg.nickname << ": " << msg.message << std::endl << std::endl;
+}
+
 /// Application entry point
 int main(int argc, char** argv) {
     Config config;
@@ -71,16 +121,20 @@ int main(int argc, char** argv) {
 #endif
     std::string filepath;
 
+    bool use_multiplayer = false;
+    std::string nickname{};
+    std::string password{};
+    std::string address{};
+    u16 port = Network::DefaultRoomPort;
+
     static struct option long_options[] = {
-        {"gdbport", required_argument, 0, 'g'},
-        {"install", required_argument, 0, 'i'},
-        {"help", no_argument, 0, 'h'},
-        {"version", no_argument, 0, 'v'},
-        {0, 0, 0, 0},
+        {"gdbport", required_argument, 0, 'g'},     {"install", required_argument, 0, 'i'},
+        {"multiplayer", required_argument, 0, 'm'}, {"help", no_argument, 0, 'h'},
+        {"version", no_argument, 0, 'v'},           {0, 0, 0, 0},
     };
 
     while (optind < argc) {
-        char arg = getopt_long(argc, argv, "g:i:hv", long_options, &option_index);
+        char arg = getopt_long(argc, argv, "g:i:m:hv", long_options, &option_index);
         if (arg != -1) {
             switch (arg) {
             case 'g':
@@ -103,6 +157,41 @@ int main(int argc, char** argv) {
                     errno = EINVAL;
                 if (errno != 0)
                     exit(1);
+            }
+            case 'm': {
+                use_multiplayer = true;
+                std::string str_arg(optarg);
+                // regex to check if the format is nickname:password@ip:port
+                // with optional :password
+                std::regex re("^([^:]+)(?::(.+))?@([^:]+)(?::([0-9]+))?$");
+                if (!std::regex_match(str_arg, re)) {
+                    std::cout << "Wrong format for option --multiplayer\n";
+                    PrintHelp(argv[0]);
+                    return 0;
+                }
+
+                std::smatch match;
+                std::regex_search(str_arg, match, re);
+                ASSERT(match.size() == 5);
+                nickname = match[1];
+                password = match[2];
+                address = match[3];
+                if (!match[4].str().empty())
+                    port = std::stoi(match[4]);
+                std::regex nickname_re("^[a-zA-Z0-9._- ]+$");
+                if (!std::regex_match(nickname, nickname_re)) {
+                    std::cout
+                        << "Nickname is not valid. Must be 4 to 20 alphanumeric characters.\n";
+                    return 0;
+                }
+                if (address.empty()) {
+                    std::cout << "Address to room must not be empty.\n";
+                    return 0;
+                }
+                if (port > 65535) {
+                    std::cout << "Port must be between 0 and 65535.\n";
+                    return 0;
+                }
                 break;
             }
             case 'h':
@@ -183,6 +272,19 @@ int main(int argc, char** argv) {
 
     Core::Telemetry().AddField(Telemetry::FieldType::App, "Frontend", "SDL");
 
+    if (use_multiplayer) {
+        if (auto member = Network::GetRoomMember().lock()) {
+            member->BindOnChatMessageRecieved(OnMessageReceived);
+            member->BindOnStateChanged(OnStateChanged);
+            LOG_DEBUG(Network, "Start connection to %s:%u with nickname %s", address.c_str(), port,
+                      nickname.c_str());
+            member->Join(nickname, address.c_str(), port, 0, Network::NoPreferredMac, password);
+        } else {
+            LOG_ERROR(Network, "Could not access RoomMember");
+            return 0;
+        }
+    }
+
     while (emu_window->IsOpen()) {
         system.RunLoop();
     }