mp_serverlist.cpp

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/*
Copyright (C) 2002-2025 UFO: Alien Invasion.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
 
#include "../../cl_shared.h"
#include "../cl_game.h"
#include "../../../shared/parse.h"
#include "../../ui/ui_data.h"
#include "../../../shared/infostring.h"
#include "mp_serverlist.h"
#include "mp_callbacks.h"
 
#define MAX_SERVERLIST 128
 
static const cgame_import_t* cgi;
 
static serverList_t serverList[MAX_SERVERLIST];
serverList_t* selectedServer;
static char serverText[1024];
static int serverListLength;
static int serverListPos;
static cvar_t* cl_serverlist;
static struct datagram_socket* netDatagramSocket;

static bool GAME_MP_ProcessPingReply (serverList_t* server, const char* msg)
{
    if (!msg)
        return false;
 
    if (PROTOCOL_VERSION != Info_IntegerForKey(msg, "sv_protocol")) {
        Com_DPrintf(DEBUG_CLIENT, "CL_ProcessPingReply: Protocol mismatch\n");
        return false;
    }
    if (!Q_streq(UFO_VERSION, Info_ValueForKey(msg, "sv_version"))) {
        Com_DPrintf(DEBUG_CLIENT, "CL_ProcessPingReply: Version mismatch\n");
    }
 
    if (server->pinged)
        return false;
 
    server->pinged = true;
    Q_strncpyz(server->sv_hostname, Info_ValueForKey(msg, "sv_hostname"),
        sizeof(server->sv_hostname));
    Q_strncpyz(server->version, Info_ValueForKey(msg, "sv_version"),
        sizeof(server->version));
    Q_strncpyz(server->mapname, Info_ValueForKey(msg, "sv_mapname"),
        sizeof(server->mapname));
    Q_strncpyz(server->gametype, Info_ValueForKey(msg, "sv_gametype"),
        sizeof(server->gametype));
    server->clients = Info_IntegerForKey(msg, "clients");
    server->sv_dedicated = Info_IntegerForKey(msg, "sv_dedicated");
    server->sv_maxclients = Info_IntegerForKey(msg, "sv_maxclients");
    return true;
}
 
typedef enum {
    SERVERLIST_SHOWALL,
    SERVERLIST_HIDEFULL,
    SERVERLIST_HIDEEMPTY
} serverListStatus_t;

static inline bool GAME_MP_ShowServer (const serverList_t* server)
{
    if (cl_serverlist->integer == SERVERLIST_SHOWALL)
        return true;
    if (cl_serverlist->integer == SERVERLIST_HIDEFULL && server->clients < server->sv_maxclients)
        return true;
    if (cl_serverlist->integer == SERVERLIST_HIDEEMPTY && server->clients > 0)
        return true;
 
    return false;
}
 
static void GAME_MP_PingServerCallback (struct net_stream* s)
{
    AutoPtr<dbuffer> buf(cgi->NET_ReadMsg(s));
    if (!buf) {
        cgi->NET_StreamFree(s);
        return;
    }
    serverList_t* server = (serverList_t*)cgi->NET_StreamGetData(s);
    const int cmd = cgi->NET_ReadByte(buf);
    if (cmd != svc_oob) {
        cgi->NET_StreamFree(s);
        return;
    }
 
    char str[512];
    cgi->NET_ReadStringLine(buf, str, sizeof(str));
 
    if (strncmp(str, "info", 4) == 0) {
        cgi->NET_ReadString(buf, str, sizeof(str));
        if (GAME_MP_ProcessPingReply(server, str)) {
            if (GAME_MP_ShowServer(server)) {
                server->serverListPos = serverListPos;
                serverListPos++;
                Q_strcat(serverText, sizeof(serverText), "%s\t\t\t%s\t\t\t%s\t\t%i/%i\n",
                        server->sv_hostname,
                        server->mapname,
                        server->gametype,
                        server->clients,
                        server->sv_maxclients);
            }
        }
    } else if (strncmp(str, "print", 5) == 0) {
        char paramBuf[2048];
        cgi->NET_ReadString(buf, paramBuf, sizeof(paramBuf));
        cgi->Com_DPrintf(DEBUG_CLIENT, "%s", paramBuf);
    }
    cgi->NET_StreamFree(s);
}

static void GAME_MP_PingServer (serverList_t* server)
{
    struct net_stream* s = cgi->NET_Connect(server->node, server->service, nullptr);
    if (s == nullptr) {
        cgi->Com_Printf("pinging failed [%s]:%s...\n", server->node, server->service);
        return;
    }
    cgi->Com_DPrintf(DEBUG_CLIENT, "pinging [%s]:%s...\n", server->node, server->service);
    cgi->NET_OOB_Printf(s, SV_CMD_INFO " %i", PROTOCOL_VERSION);
    cgi->NET_StreamSetData(s, server);
    cgi->NET_StreamSetCallback(s, &GAME_MP_PingServerCallback);
}

static void GAME_MP_PrintServerList_f (void)
{
    cgi->Com_Printf("%i servers on the list\n", serverListLength);
 
    for (int i = 0; i < serverListLength; i++) {
        const serverList_t* list = &serverList[i];
        cgi->Com_Printf("%02i: [%s]:%s (pinged: %i)\n", i, list->node, list->service, list->pinged);
    }
}

static void GAME_MP_AddServerToList (const char* node, const char* service)
{
    if (serverListLength >= MAX_SERVERLIST)
        return;
 
    for (int i = 0; i < serverListLength; i++)
        if (Q_streq(serverList[i].node, node) && Q_streq(serverList[i].service, service))
            return;
 
    OBJZERO(serverList[serverListLength]);
    serverList[serverListLength].node = cgi->GAME_StrDup(node);
    serverList[serverListLength].service = cgi->GAME_StrDup(service);
    GAME_MP_PingServer(&serverList[serverListLength]);
    serverListLength++;
}

void GAME_MP_ParseTeamInfoMessage (dbuffer* msg)
{
    char str[4096];
    if (cgi->NET_ReadString(msg, str, sizeof(str)) == 0) {
        cgi->UI_ResetData(TEXT_MULTIPLAYER_USERLIST);
        cgi->UI_ResetData(TEXT_MULTIPLAYER_USERTEAM);
        cgi->UI_ExecuteConfunc("multiplayer_playerNumber 0");
        cgi->Com_DPrintf(DEBUG_CLIENT, "GAME_MP_ParseTeamInfoMessage: No teaminfo string\n");
        return;
    }
 
    OBJZERO(teamData);
 
    teamData.maxteams = Info_IntegerForKey(str, "sv_maxteams");
    teamData.maxPlayersPerTeam = Info_IntegerForKey(str, "sv_maxplayersperteam");
 
    int cnt = 0;
    linkedList_t* userList = nullptr;
    linkedList_t* userTeam = nullptr;
 
    /* for each lines */
    while (cgi->NET_ReadString(msg, str, sizeof(str)) > 0) {
        const int team = Info_IntegerForKey(str, "cl_team");
        const int isReady = Info_IntegerForKey(str, "cl_ready");
        const char* user = Info_ValueForKey(str, "cl_name");
 
        if (team > 0 && team < MAX_TEAMS)
            teamData.teamCount[team]++;
 
        /* store data */
        cgi->LIST_AddString(&userList, user);
        if (team != TEAM_NO_ACTIVE)
            cgi->LIST_AddString(&userTeam, va(_("Team %d"), team));
        else
            cgi->LIST_AddString(&userTeam, _("No team"));
 
        cgi->UI_ExecuteConfunc("multiplayer_playerIsReady %i %i", cnt, isReady);
 
        cnt++;
    }
 
    cgi->UI_RegisterLinkedListText(TEXT_MULTIPLAYER_USERLIST, userList);
    cgi->UI_RegisterLinkedListText(TEXT_MULTIPLAYER_USERTEAM, userTeam);
    cgi->UI_ExecuteConfunc("multiplayer_playerNumber %i", cnt);
 
    /* no players are connected ATM */
    if (!cnt) {
        /* Q_strcat(teamData.teamInfoText, sizeof(teamData.teamInfoText), _("No player connected\n")); */
    }
 
    cgi->Cvar_SetValue("mn_maxteams", teamData.maxteams);
    cgi->Cvar_SetValue("mn_maxplayersperteam", teamData.maxPlayersPerTeam);
}
 
static char serverInfoText[1024];
static char userInfoText[256];
static void GAME_MP_ParseServerInfoMessage (dbuffer* msg, const char* hostname)
{
    char str[MAX_INFO_STRING];
 
    cgi->NET_ReadString(msg, str, sizeof(str));
 
    /* check for server status response message */
    const char* value = Info_ValueForKey(str, "sv_dedicated");
    if (Q_strnull(value)) {
        cgi->Com_Printf(S_COLOR_GREEN "%s", str);
        return;
    }
 
    /* server info cvars and users are seperated via newline */
    const char* users = strstr(str, "\n");
    if (users == nullptr) {
        cgi->Com_Printf(S_COLOR_GREEN "%s\n", str);
        return;
    }
    cgi->Com_DPrintf(DEBUG_CLIENT, "%s\n", str); /* status string */
 
    cgi->Cvar_Set("mn_mappic", "maps/shots/default");
    if (*Info_ValueForKey(str, "sv_needpass") == '1')
        cgi->Cvar_Set("mn_server_need_password", "1");
    else
        cgi->Cvar_Set("mn_server_need_password", "0");
 
    Com_sprintf(serverInfoText, sizeof(serverInfoText), _("IP\t%s\n\n"), hostname);
    cgi->Cvar_Set("mn_server_ip", "%s", hostname);
    value = Info_ValueForKey(str, "sv_mapname");
    assert(value);
    cgi->Cvar_Set("mn_svmapname", "%s", value);
    char buf[256];
    Q_strncpyz(buf, value, sizeof(buf));
    const char* token = buf;
    /* skip random map char. */
    if (token[0] == '+')
        token++;
 
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Map:\t%s\n"), value);
    if (!cgi->R_ImageExists("pics/maps/shots/%s", token)) {
        /* store it relative to pics/ dir - not relative to game dir */
        cgi->Cvar_Set("mn_mappic", "maps/shots/%s", token);
    }
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Servername:\t%s\n"), Info_ValueForKey(str, "sv_hostname"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Moralestates:\t%s\n"), _(Info_BoolForKey(str, "sv_enablemorale")));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Gametype:\t%s\n"), Info_ValueForKey(str, "sv_gametype"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Gameversion:\t%s\n"), Info_ValueForKey(str, "ver"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Dedicated server:\t%s\n"), _(Info_BoolForKey(str, "sv_dedicated")));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Operating system:\t%s\n"), Info_ValueForKey(str, "sys_os"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Network protocol:\t%s\n"), Info_ValueForKey(str, "sv_protocol"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Roundtime:\t%s\n"), Info_ValueForKey(str, "sv_roundtimelimit"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Teamplay:\t%s\n"), _(Info_BoolForKey(str, "sv_teamplay")));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Max. players per team:\t%s\n"), Info_ValueForKey(str, "sv_maxplayersperteam"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Max. teams allowed in this map:\t%s\n"), Info_ValueForKey(str, "sv_maxteams"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Max. clients:\t%s\n"), Info_ValueForKey(str, "sv_maxclients"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Max. soldiers per player:\t%s\n"), Info_ValueForKey(str, "sv_maxsoldiersperplayer"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Max. soldiers per team:\t%s\n"), Info_ValueForKey(str, "sv_maxsoldiersperteam"));
    Q_strcat(serverInfoText, sizeof(serverInfoText), _("Password protected:\t%s\n"), _(Info_BoolForKey(str, "sv_needpass")));
    cgi->UI_RegisterText(TEXT_STANDARD, serverInfoText);
    userInfoText[0] = '\0';
    for (;;) {
        token = Com_Parse(&users);
        if (users == nullptr)
            break;
        const int team = atoi(token);
        token = Com_Parse(&users);
        if (users == nullptr)
            break;
        Q_strcat(userInfoText, sizeof(userInfoText), "%s\t%i\n", token, team);
    }
    cgi->UI_RegisterText(TEXT_LIST, userInfoText);
    cgi->UI_PushWindow("serverinfo");
}

static void GAME_MP_ServerInfoCallback (struct net_stream* s)
{
    AutoPtr<dbuffer> buf(cgi->NET_ReadMsg(s));
    if (!buf) {
        cgi->NET_StreamFree(s);
        return;
    }
    const int cmd = cgi->NET_ReadByte(buf);
    if (cmd != svc_oob) {
        cgi->NET_StreamFree(s);
        return;
    }
    char str[8];
    cgi->NET_ReadStringLine(buf, str, sizeof(str));
    if (Q_streq(str, "print")) {
        char hostname[256];
        cgi->NET_StreamPeerToName(s, hostname, sizeof(hostname), true);
        GAME_MP_ParseServerInfoMessage(buf, hostname);
    }
    cgi->NET_StreamFree(s);
}
 
static void GAME_MP_QueryMasterServerThread (const char* responseBuf, void* userdata)
{
    if (!responseBuf) {
        cgi->Com_Printf("Could not query masterserver\n");
        return;
    }
 
    const char* serverListBuf = responseBuf;
 
    Com_DPrintf(DEBUG_CLIENT, "masterserver response: %s\n", serverListBuf);
    const char* token = Com_Parse(&serverListBuf);
 
    int num = atoi(token);
    if (num >= MAX_SERVERLIST) {
        cgi->Com_DPrintf(DEBUG_CLIENT, "Too many servers: %i\n", num);
        num = MAX_SERVERLIST;
    }
    for (int i = 0; i < num; i++) {
        /* host */
        token = Com_Parse(&serverListBuf);
        if (!*token || !serverListBuf) {
            cgi->Com_Printf("Could not finish the masterserver response parsing\n");
            break;
        }
        char node[MAX_VAR];
        Q_strncpyz(node, token, sizeof(node));
        /* port */
        token = Com_Parse(&serverListBuf);
        if (token[0] == '\0' || !serverListBuf) {
            cgi->Com_Printf("Could not finish the masterserver response parsing\n");
            break;
        }
        char service[MAX_VAR];
        Q_strncpyz(service, token, sizeof(service));
        GAME_MP_AddServerToList(node, service);
    }
}

static void GAME_MP_ServerListDiscoveryCallback (struct datagram_socket* s, const char* buf, int len, struct sockaddr* from)
{
    const char match[] = "discovered";
    if (len == sizeof(match) && memcmp(buf, match, len) == 0) {
        char node[MAX_VAR];
        char service[MAX_VAR];
        cgi->NET_SockaddrToStrings(s, from, node, sizeof(node), service, sizeof(service));
        GAME_MP_AddServerToList(node, service);
    }
}

static void GAME_MP_BookmarkAdd_f (void)
{
    const char* newBookmark;
 
    if (cgi->Cmd_Argc() < 2) {
        newBookmark = cgi->Cvar_GetString("mn_server_ip");
        if (!newBookmark) {
            cgi->Com_Printf("Usage: %s <ip>\n", cgi->Cmd_Argv(0));
            return;
        }
    } else {
        newBookmark = cgi->Cmd_Argv(1);
    }
 
    for (int i = 0; i < MAX_BOOKMARKS; i++) {
        const char* bookmark = cgi->Cvar_GetString(va("adr%i", i));
        if (bookmark[0] == '\0') {
            cgi->Cvar_Set(va("adr%i", i), "%s", newBookmark);
            return;
        }
    }
    /* bookmarks are full */
    cgi->UI_Popup(_("Notice"), "%s", _("All bookmark slots are used - please removed unused entries and repeat this step"));
}

static void GAME_MP_ServerInfo_f (void)
{
    const char* host;
    const char* port;
 
    switch (cgi->Cmd_Argc()) {
    case 2:
        host = cgi->Cmd_Argv(1);
        port = DOUBLEQUOTE(PORT_SERVER);
        break;
    case 3:
        host = cgi->Cmd_Argv(1);
        port = cgi->Cmd_Argv(2);
        break;
    default:
        if (selectedServer) {
            host = selectedServer->node;
            port = selectedServer->service;
        } else {
            host = cgi->Cvar_GetString("mn_server_ip");
            port = DOUBLEQUOTE(PORT_SERVER);
        }
        break;
    }
    struct net_stream* s = cgi->NET_Connect(host, port, nullptr);
    if (s != nullptr) {
        cgi->NET_OOB_Printf(s, SV_CMD_STATUS " %i", PROTOCOL_VERSION);
        cgi->NET_StreamSetCallback(s, &GAME_MP_ServerInfoCallback);
    } else {
        cgi->Com_Printf("Could not connect to %s %s\n", host, port);
    }
}

static void GAME_MP_ServerListClick_f (void)
{
    if (cgi->Cmd_Argc() < 2) {
        cgi->Com_Printf("Usage: %s <num>\n", cgi->Cmd_Argv(0));
        return;
    }
    const int num = atoi(cgi->Cmd_Argv(1));
 
    if (num < 0 || num >= serverListLength)
        return;
 
    cgi->UI_RegisterText(TEXT_STANDARD, serverInfoText);
    for (int i = 0; i < serverListLength; i++) {
        if (!serverList[i].pinged || serverList[i].serverListPos != num)
            continue;
        /* found the server - grab the infos for this server */
        selectedServer = &serverList[i];
        cgi->Cbuf_AddText("server_info %s %s\n", serverList[i].node, serverList[i].service);
        return;
    }
}

static bool serversAlreadyQueried = false;
static int lastServerQuery = 0;
#define SERVERQUERYTIMEOUT 40000

void GAME_MP_PingServers_f (void)
{
    selectedServer = nullptr;
 
    /* refresh the list */
    if (cgi->Cmd_Argc() == 2) {
        /* reset current list */
        serverText[0] = 0;
        serversAlreadyQueried = false;
        for (int i = 0; i < serverListLength; i++) {
            cgi->Free(serverList[i].node);
            cgi->Free(serverList[i].service);
        }
        serverListPos = 0;
        serverListLength = 0;
        OBJZERO(serverList);
    } else {
        cgi->UI_RegisterText(TEXT_LIST, serverText);
        return;
    }
 
    if (!netDatagramSocket)
        netDatagramSocket = cgi->NET_DatagramSocketNew(nullptr, DOUBLEQUOTE(PORT_CLIENT), &GAME_MP_ServerListDiscoveryCallback);
 
    /* broadcast search for all the servers int the local network */
    if (netDatagramSocket) {
        const char buf[] = "discover";
        cgi->NET_DatagramBroadcast(netDatagramSocket, buf, sizeof(buf), PORT_SERVER);
    }
    cgi->UI_RegisterText(TEXT_LIST, serverText);
 
    /* don't query the masterservers with every call */
    if (serversAlreadyQueried) {
        if (lastServerQuery + SERVERQUERYTIMEOUT > cgi->CL_Milliseconds())
            return;
    } else
        serversAlreadyQueried = true;
 
    lastServerQuery = cgi->CL_Milliseconds();
 
    /* query master server? */
    if (cgi->Cmd_Argc() == 2 && !Q_streq(cgi->Cmd_Argv(1), "local")) {
        cgi->Com_DPrintf(DEBUG_CLIENT, "Query masterserver\n");
        cgi->CL_QueryMasterServer("query", GAME_MP_QueryMasterServerThread);
    }
}
 
static const cmdList_t serverListCmds[] = {
    {"bookmark_add", GAME_MP_BookmarkAdd_f, "Add a new bookmark - see adrX cvars"},
    {"server_info", GAME_MP_ServerInfo_f, nullptr},
    {"serverlist", GAME_MP_PrintServerList_f, nullptr},
    /* text id is servers in menu_multiplayer.ufo */
    {"servers_click", GAME_MP_ServerListClick_f, nullptr},
    {nullptr, nullptr, nullptr}
};
void GAME_MP_ServerListInit (const cgame_import_t* import)
{
    cgi = import;
    /* register our variables */
    for (int i = 0; i < MAX_BOOKMARKS; i++)
        cgi->Cvar_Get(va("adr%i", i), "", CVAR_ARCHIVE, "Bookmark for network ip");
    cl_serverlist = cgi->Cvar_Get("cl_serverlist", "0", CVAR_ARCHIVE, "0=show all, 1=hide full - servers on the serverlist");
 
    cgi->Cmd_TableAddList(serverListCmds);
}
 
void GAME_MP_ServerListShutdown (void)
{
    cgi->Cmd_TableRemoveList(serverListCmds);
 
    cgi->NET_DatagramSocketClose(netDatagramSocket);
    netDatagramSocket = nullptr;
}