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/* |
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CrossFire, A Multiplayer game for X-windows |
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|
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Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team |
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Copyright (C) 1992 Frank Tore Johansen |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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|
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The author can be reached via e-mail to <crossfire@schmorp.de> |
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*/ |
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|
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/** |
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* \file |
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* Main client/server loops. |
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* |
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* \date 2003-12-02 |
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* |
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* loop.c mainly deals with initialization and higher level socket |
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* maintenance (checking for lost connections and if data has arrived.) |
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* The reading of data is handled in ericserver.c |
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*/ |
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|
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|
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#include <global.h> |
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#include <sproto.h> |
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#include <sockproto.h> |
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|
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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|
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#ifdef HAVE_UNISTD_H |
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# include <unistd.h> |
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#endif |
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|
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#ifdef HAVE_ARPA_INET_H |
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# include <arpa/inet.h> |
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#endif |
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|
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#include <loader.h> |
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#include <newserver.h> |
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|
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/***************************************************************************** |
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* Start of command dispatch area. |
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* The commands here are protocol commands. |
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****************************************************************************/ |
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|
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/* Either keep this near the start or end of the file so it is |
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* at least reasonablye easy to find. |
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* There are really 2 commands - those which are sent/received |
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* before player joins, and those happen after the player has joined. |
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* As such, we have function types that might be called, so |
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* we end up having 2 tables. |
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*/ |
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|
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typedef void (*func_uint8_int_ns) (char *, int, client_socket *); |
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|
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struct NsCmdMapping |
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{ |
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const char *cmdname; |
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func_uint8_int_ns cmdproc; |
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uint8 flag; |
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}; |
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|
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typedef void (*func_uint8_int_pl) (char *, int, player *); |
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struct PlCmdMapping |
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{ |
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const char *cmdname; |
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func_uint8_int_pl cmdproc; |
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uint8 flag; |
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}; |
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|
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/** |
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* Dispatch table for the server. |
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* |
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* CmdMapping is the dispatch table for the server, used in HandleClient, |
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* which gets called when the client has input. All commands called here |
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* use the same parameter form (char* data, int len, int clientnum. |
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* We do implicit casts, because the data that is being passed is |
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* unsigned (pretty much needs to be for binary data), however, most |
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* of these treat it only as strings, so it makes things easier |
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* to cast it here instead of a bunch of times in the function itself. |
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* flag is 1 if the player must be in the playing state to issue the |
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* command, 0 if they can issue it at any time. |
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*/ |
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static struct PlCmdMapping plcommands[] = { |
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{"examine", ExamineCmd, 1}, |
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{"apply", ApplyCmd, 1}, |
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{"move", MoveCmd, 1}, |
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{"reply", ReplyCmd, 0}, |
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{"command", PlayerCmd, 1}, |
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{"ncom", (func_uint8_int_pl) NewPlayerCmd, 1}, |
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{"lookat", LookAt, 1}, |
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{"lock", (func_uint8_int_pl) LockItem, 1}, |
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{"mark", (func_uint8_int_pl) MarkItem, 1}, |
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{"mapredraw", MapRedrawCmd, 0}, /* Added: phil */ |
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{"mapinfo", MapInfoCmd, 2}, /* CF+ */ |
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{"ext", ExtCmd, 2}, /* CF+ */ |
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{ 0 } /* terminator */ |
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}; |
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|
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/** Face-related commands */ |
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static struct NsCmdMapping nscommands[] = { |
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{"addme", AddMeCmd, 2}, |
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{"askface", SendFaceCmd}, /* Added: phil */ |
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{"requestinfo", RequestInfo}, |
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{"setfacemode", SetFaceMode, 2}, |
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{"setsound", SetSound, 2}, |
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{"setup", SetUp, 2}, |
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{"version", VersionCmd, 2}, |
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{"toggleextendedinfos", ToggleExtendedInfos, 2}, /*Added: tchize */ |
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{"toggleextendedtext", ToggleExtendedText, 2}, /*Added: tchize */ |
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{"asksmooth", AskSmooth}, /*Added: tchize (smoothing technologies) */ |
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{ 0 } /* terminator (I, II & III) */ |
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}; |
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|
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/** |
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* RequestInfo is sort of a meta command. There is some specific |
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* request of information, but we call other functions to provide |
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* that information. |
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*/ |
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void |
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RequestInfo (char *buf, int len, client_socket * ns) |
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{ |
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char *params = NULL, *cp; |
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|
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/* No match */ |
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char bigbuf[MAX_BUF]; |
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int slen; |
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|
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/* Set up replyinfo before we modify any of the buffers - this is used |
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* if we don't find a match. |
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*/ |
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strcpy (bigbuf, "replyinfo "); |
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slen = strlen (bigbuf); |
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safe_strcat (bigbuf, buf, &slen, MAX_BUF); |
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|
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/* find the first space, make it null, and update the |
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* params pointer. |
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*/ |
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for (cp = buf; *cp != '\0'; cp++) |
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if (*cp == ' ') |
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{ |
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*cp = '\0'; |
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params = cp + 1; |
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break; |
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} |
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|
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if (!strcmp (buf, "image_info")) |
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send_image_info (ns, params); |
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else if (!strcmp (buf, "image_sums")) |
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send_image_sums (ns, params); |
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else if (!strcmp (buf, "skill_info")) |
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send_skill_info (ns, params); |
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else if (!strcmp (buf, "spell_paths")) |
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send_spell_paths (ns, params); |
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else |
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ns->send_packet (bigbuf, len); |
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} |
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|
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/** |
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* Handle client input. |
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* |
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* HandleClient is actually not named really well - we only get here once |
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* there is input, so we don't do exception or other stuff here. |
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* sock is the output socket information. pl is the player associated |
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* with this socket, null if no player (one of the init_sockets for just |
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* starting a connection) |
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*/ |
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|
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void |
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HandleClient (client_socket *ns, player *pl) |
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{ |
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/* Loop through this - maybe we have several complete packets here. */ |
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// limit to a few commands only, though, as to not monopolise the server |
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for (int repeat = 16; repeat--;) |
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{ |
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/* If it is a player, and they don't have any speed left, we |
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* return, and will read in the data when they do have time. |
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*/ |
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if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0) |
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return; |
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|
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int pkt_len = ns->read_packet (); |
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|
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if (pkt_len < 0) |
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{ |
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LOG (llevError, "read error on player %s\n", &pl->ob->name); |
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/* Caller will take care of cleaning this up */ |
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ns->status = Ns_Dead; |
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return; |
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} |
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else if (pkt_len == 0) |
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/* Still dont have a full packet */ |
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return; |
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|
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/* First, break out beginning word. There are at least |
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* a few commands that do not have any paremeters. If |
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* we get such a command, don't worry about trying |
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* to break it up. |
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*/ |
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int datalen; |
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char *data = strchr ((char *)ns->inbuf + 2, ' '); |
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|
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if (data) |
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{ |
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*data++ = 0; |
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datalen = pkt_len - (data - (char *)ns->inbuf); |
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} |
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else |
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{ |
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data = (char *)ns->inbuf + 2; // better read garbage than segfault |
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datalen = 0; |
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} |
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|
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ns->inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
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|
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for (int i = 0; nscommands[i].cmdname; i++) |
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{ |
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if (!strcmp ((char *)ns->inbuf + 2, nscommands[i].cmdname)) |
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{ |
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nscommands[i].cmdproc (data, datalen, ns); |
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ns->skip_packet (pkt_len); |
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//D// not doing this causes random memory corruption |
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if (nscommands[i].flag & 2) |
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goto next_packet; |
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return; |
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} |
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} |
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|
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/* Player must be in the playing state or the flag on the |
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* the command must be zero for the user to use the command - |
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* otherwise, a player cam save, be in the play_again state, and |
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* the map they were on gets swapped out, yet things that try to look |
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* at the map causes a crash. If the command is valid, but |
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* one they can't use, we still swallow it up. |
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*/ |
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if (pl) |
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for (int i = 0; plcommands[i].cmdname; i++) |
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{ |
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if (!strcmp ((char *)ns->inbuf + 2, plcommands[i].cmdname)) |
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{ |
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if (pl->state == ST_PLAYING || !(plcommands[i].flag & 1)) |
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plcommands[i].cmdproc ((char *) data, datalen, pl); |
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|
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ns->skip_packet (pkt_len); |
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//D// not doing this causes random memory corruption |
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if (plcommands[i].flag & 2) |
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goto next_packet; |
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|
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return; |
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} |
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} |
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|
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/* If we get here, we didn't find a valid command. Logging |
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* this might be questionable, because a broken client/malicious |
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* user could certainly send a whole bunch of invalid commands. |
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*/ |
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LOG (llevDebug, "Bad command from client (%s)\n", ns->inbuf + 2); |
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ns->skip_packet (pkt_len); |
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next_packet: |
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; |
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} |
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} |
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|
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void |
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flush_sockets (void) |
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{ |
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for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ++i) |
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if ((*i)->status != Ns_Dead) |
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(*i)->flush (); |
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} |
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|
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/** |
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* This checks the sockets for input, does the right thing. |
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* |
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* A bit of this code is grabbed out of socket.c |
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* There are 2 lists we need to look through - init_sockets is a list |
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* |
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*/ |
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void |
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doeric_server (void) |
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{ |
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int i, pollret; |
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fd_set tmp_read; |
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struct sockaddr_in addr; |
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socklen_t addrlen = sizeof (struct sockaddr); |
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player *pl, *next; |
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int maxfd = 0; |
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|
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#ifdef CS_LOGSTATS |
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if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME) |
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write_cs_stats (); |
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#endif |
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|
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/* Go through the players. Let the loop set the next pl value, |
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* since we may remove some |
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*/ |
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//TODO: must be handled cleanly elsewhere |
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for (pl = first_player; pl; ) |
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{ |
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player *npl = pl->next; |
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|
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//TODO: must be handled cleanly elsewhere |
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if (pl->socket->status == Ns_Dead) |
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{ |
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save_player (pl->ob, 0); |
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|
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if (!QUERY_FLAG (pl->ob, FLAG_REMOVED)) |
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{ |
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terminate_all_pets (pl->ob); |
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pl->ob->remove (); |
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} |
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|
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leave (pl, 1); |
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final_free_player (pl); |
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} |
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|
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pl = npl; |
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} |
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|
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FD_ZERO (&tmp_read); |
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|
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for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ) |
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{ |
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client_socket *s = *i; |
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|
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if (s->status == Ns_Dead) |
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{ |
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client_sockets.erase (i); |
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delete s; |
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} |
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else |
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{ |
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if (s->fd > maxfd) maxfd = s->fd; |
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|
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FD_SET (s->fd, &tmp_read); |
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|
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++i; |
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} |
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} |
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|
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struct timeval timeout; |
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|
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timeout.tv_sec = 0; |
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timeout.tv_usec = 0; |
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|
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pollret = select (maxfd + 1, |
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&tmp_read, 0, 0, |
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&timeout); |
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|
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if (pollret == -1) |
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{ |
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LOG (llevError, "select failed: %s\n", strerror (errno)); |
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return; |
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} |
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|
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/* We need to do some of the processing below regardless */ |
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|
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/* Check for any input on the sockets */ |
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for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ++i) |
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{ |
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client_socket *s = *i; |
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player *pl = s->pl; |
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|
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//TODO: disassociate handleclient from socket readin |
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if (s->inbuf_len || FD_ISSET (s->fd, &tmp_read)) |
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HandleClient (s, pl); |
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|
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//TODO: should not be done here, either |
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if (s->status != Ns_Dead && pl) |
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{ |
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/* Update the players stats once per tick. More efficient than |
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* sending them whenever they change, and probably just as useful |
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*/ |
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esrv_update_stats (pl); |
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if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob)) |
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{ |
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esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob); |
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if (pl->last_weight != WEIGHT (pl->ob)) |
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LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n", |
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(unsigned long) pl->last_weight, WEIGHT (pl->ob)); |
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} |
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|
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/* draw_client_map does sanity checking that map is |
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* valid, so don't do it here. |
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*/ |
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draw_client_map (pl->ob); |
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if (s->update_look) |
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esrv_draw_look (pl->ob); |
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} |
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} |
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} |
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|
