server/socket/loop.C

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to <crossfire@schmorp.de>
*/

/**
 * \file
 * Main client/server loops.
 *
 * \date 2003-12-02
 *
 * loop.c mainly deals with initialization and higher level socket
 * maintenance (checking for lost connections and if data has arrived.)
 * The reading of data is handled in ericserver.c
 */


#include <global.h>
#ifndef __CEXTRACT__
# include <sproto.h>
# include <sockproto.h>
#endif

#ifndef WIN32                   /* ---win32 exclude unix headers */
# include <sys/types.h>
# include <sys/time.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netdb.h>
#endif /* end win32 */

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif

#include <loader.h>
#include <newserver.h>

/*****************************************************************************
 * Start of command dispatch area.
 * The commands here are protocol commands. 
 ****************************************************************************/

/* Either keep this near the start or end of the file so it is
 * at least reasonablye easy to find.
 * There are really 2 commands - those which are sent/received
 * before player joins, and those happen after the player has joined.
 * As such, we have function types that might be called, so
 * we end up having 2 tables.
 */

typedef void (*func_uint8_int_ns) (char *, int, NewSocket *);

struct NsCmdMapping
{
  const char *cmdname;
  func_uint8_int_ns cmdproc;
};

typedef void (*func_uint8_int_pl) (char *, int, player *);
struct PlCmdMapping
{
  const char *cmdname;
  func_uint8_int_pl cmdproc;
  uint8 flag;
};

/**
 * Dispatch table for the server.
 *
 * CmdMapping is the dispatch table for the server, used in HandleClient,
 * which gets called when the client has input.  All commands called here 
 * use the same parameter form (char* data, int len, int clientnum.
 * We do implicit casts, because the data that is being passed is
 * unsigned (pretty much needs to be for binary data), however, most
 * of these treat it only as strings, so it makes things easier
 * to cast it here instead of a bunch of times in the function itself.
 * flag is 1 if the player must be in the playing state to issue the
 * command, 0 if they can issue it at any time.
 */
static struct PlCmdMapping plcommands[] = {
  {"examine", ExamineCmd, 1},
  {"apply", ApplyCmd, 1},
  {"move", MoveCmd, 1},
  {"reply", ReplyCmd, 0},
  {"command", PlayerCmd, 1},
  {"ncom", (func_uint8_int_pl) NewPlayerCmd, 1},
  {"lookat", LookAt, 1},
  {"lock", (func_uint8_int_pl) LockItem, 1},
  {"mark", (func_uint8_int_pl) MarkItem, 1},
  {"mapredraw", MapRedrawCmd, 0},       /* Added: phil */
  {"mapinfo", MapInfoCmd, 2},   /* CF+ */
  {"ext", ExtCmd, 2},           /* CF+ */
  {NULL, NULL, 0}               /* terminator */
};

/** Face-related commands */
static struct NsCmdMapping nscommands[] = {
  {"addme", AddMeCmd},
  {"askface", SendFaceCmd},     /* Added: phil */
  {"requestinfo", RequestInfo},
  {"setfacemode", SetFaceMode},
  {"setsound", SetSound},
  {"setup", SetUp},
  {"version", VersionCmd},
  {"toggleextendedinfos", ToggleExtendedInfos}, /*Added: tchize */
  {"toggleextendedtext", ToggleExtendedText},   /*Added: tchize */
  {"asksmooth", AskSmooth},     /*Added: tchize (smoothing technologies) */
  {NULL, NULL}                  /* terminator (I, II & III) */
};

/**
 * RequestInfo is sort of a meta command. There is some specific
 * request of information, but we call other functions to provide
 * that information.
 */
void
RequestInfo (char *buf, int len, NewSocket * ns)
{
  char *params = NULL, *cp;

  /* No match */
  char bigbuf[MAX_BUF];
  int slen;

  /* Set up replyinfo before we modify any of the buffers - this is used
   * if we don't find a match.
   */
  strcpy (bigbuf, "replyinfo ");
  slen = strlen (bigbuf);
  safe_strcat (bigbuf, buf, &slen, MAX_BUF);

  /* find the first space, make it null, and update the
   * params pointer.
   */
  for (cp = buf; *cp != '\0'; cp++)
    if (*cp == ' ')
      {
        *cp = '\0';
        params = cp + 1;
        break;
      }
  if (!strcmp (buf, "image_info"))
    send_image_info (ns, params);
  else if (!strcmp (buf, "image_sums"))
    send_image_sums (ns, params);
  else if (!strcmp (buf, "skill_info"))
    send_skill_info (ns, params);
  else if (!strcmp (buf, "spell_paths"))
    send_spell_paths (ns, params);
  else
    Write_String_To_Socket (ns, bigbuf, len);
}

/**
 * Handle client input.
 *
 * HandleClient is actually not named really well - we only get here once
 * there is input, so we don't do exception or other stuff here.
 * sock is the output socket information.  pl is the player associated
 * with this socket, null if no player (one of the init_sockets for just
 * starting a connection)
 */

void
HandleClient (NewSocket * ns, player *pl)
{
  int len = 0, i, cnt;
  char *data;

  /* Loop through this - maybe we have several complete packets here. */
  // limit to a few commands only, though, as to not monopolise the server
  for (cnt = 16; cnt--;)
    {
      /* If it is a player, and they don't have any speed left, we
       * return, and will read in the data when they do have time.
       */
      if (pl && pl->state == ST_PLAYING && pl->ob != NULL && pl->ob->speed_left < 0)
        {
          return;
        }

      i = SockList_ReadPacket (ns->fd, &ns->inbuf, MAXSOCKBUF - 1);

      if (i < 0)
        {
#ifdef ESRV_DEBUG
          LOG (llevDebug, "HandleClient: Read error on connection player %s\n", (pl ? pl->ob->name : "None"));
#endif
          /* Caller will take care of cleaning this up */
          ns->status = Ns_Dead;
          return;
        }
      /* Still dont have a full packet */
      if (i == 0)
        return;

//        //D//TODO//temporarily log long commands
//        if (ns->inbuf.len >= 40 && pl && pl->ob)
//          LOG (llevDebug, "HandleClient: long comamnd from <%s,%s> %d<%s>\n", pl->ob->name, ns->host, ns->inbuf.len, ns->inbuf.buf + 2);

      /* First, break out beginning word.  There are at least
       * a few commands that do not have any paremeters.  If
       * we get such a command, don't worry about trying
       * to break it up.
       */
      data = (char *) strchr ((char *) ns->inbuf.buf + 2, ' ');
      if (data)
        {
          *data = '\0';
          data++;
          len = ns->inbuf.len - (data - (char *) ns->inbuf.buf);
        }
      else
        len = 0;

      ns->inbuf.buf[ns->inbuf.len] = '\0';      /* Terminate buffer - useful for string data */
      for (i = 0; nscommands[i].cmdname != NULL; i++)
        {
          if (strcmp ((char *) ns->inbuf.buf + 2, nscommands[i].cmdname) == 0)
            {
              nscommands[i].cmdproc ((char *) data, len, ns);
              ns->inbuf.len = 0;
              return;           //D// not doing this causes random memory corruption
              goto next_packet;
            }
        }
      /* Player must be in the playing state or the flag on the
       * the command must be zero for the user to use the command -
       * otherwise, a player cam save, be in the play_again state, and
       * the map they were on gets swapped out, yet things that try to look
       * at the map causes a crash.  If the command is valid, but
       * one they can't use, we still swallow it up.
       */
      if (pl)
        for (i = 0; plcommands[i].cmdname != NULL; i++)
          {
            if (strcmp ((char *) ns->inbuf.buf + 2, plcommands[i].cmdname) == 0)
              {
                if (pl->state == ST_PLAYING || !(plcommands[i].flag & 1))
                  plcommands[i].cmdproc ((char *) data, len, pl);
                ns->inbuf.len = 0;
                //D// not doing this causes random memory corruption
                if (plcommands[i].flag & 2)
                  goto next_packet;
                return;
              }
          }
      /* If we get here, we didn't find a valid command.  Logging
       * this might be questionable, because a broken client/malicious
       * user could certainly send a whole bunch of invalid commands.
       */
      LOG (llevDebug, "Bad command from client (%s)\n", ns->inbuf.buf + 2);
    next_packet:
      ;
    }
}


/*****************************************************************************
 *
 * Low level socket looping - select calls and watchdog udp packet
 * sending.
 *
 ******************************************************************************/

#ifdef WATCHDOG

/**
 * Tell watchdog that we are still alive
 *
 * I put the function here since we should hopefully already be getting
 * all the needed include files for socket support 
 */

void
watchdog (void)
{
  static int fd = -1;
  static struct sockaddr_in insock;

  if (fd == -1)
    {
      struct protoent *protoent;

      if ((protoent = getprotobyname ("udp")) == NULL || (fd = socket (PF_INET, SOCK_DGRAM, protoent->p_proto)) == -1)
        {
          return;
        }
      insock.sin_family = AF_INET;
      insock.sin_port = htons ((unsigned short) 13325);
      insock.sin_addr.s_addr = inet_addr ("127.0.0.1");
    }
  sendto (fd, (void *) &fd, 1, 0, (struct sockaddr *) &insock, sizeof (insock));
}
#endif

void
flush_sockets (void)
{
  player *pl;

  for (pl = first_player; pl != NULL; pl = pl->next)
    if (pl->socket.status != Ns_Dead)
      Socket_Flush (&pl->socket);
}

/**
 * This checks the sockets for input and exceptions, does the right thing.
 *
 * A bit of this code is grabbed out of socket.c
 * There are 2 lists we need to look through - init_sockets is a list
 * 
 */
void
doeric_server (void)
{
  int i, pollret;
  fd_set tmp_read, tmp_exceptions, tmp_write;
  struct sockaddr_in addr;
  socklen_t addrlen = sizeof (struct sockaddr);
  player *pl, *next;

#ifdef CS_LOGSTATS
  if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
    write_cs_stats ();
#endif

  FD_ZERO (&tmp_read);
  FD_ZERO (&tmp_write);
  FD_ZERO (&tmp_exceptions);

  for (i = 0; i < socket_info.allocated_sockets; i++)
    {
      if (init_sockets[i].status == Ns_Dead)
        {
          free_newsocket (&init_sockets[i]);
          init_sockets[i].status = Ns_Avail;
          socket_info.nconns--;
        }
      else if (init_sockets[i].status != Ns_Avail)
        {
          FD_SET ((uint32) init_sockets[i].fd, &tmp_read);
          FD_SET ((uint32) init_sockets[i].fd, &tmp_write);
          FD_SET ((uint32) init_sockets[i].fd, &tmp_exceptions);
        }
    }

  /* Go through the players.  Let the loop set the next pl value,
   * since we may remove some
   */
  for (pl = first_player; pl != NULL;)
    {
      if (pl->socket.status == Ns_Dead)
        {
          player *npl = pl->next;

          save_player (pl->ob, 0);
          if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
            {
              terminate_all_pets (pl->ob);
              remove_ob (pl->ob);
            }
          leave (pl, 1);
          final_free_player (pl);
          pl = npl;
        }
      else
        {
          FD_SET ((uint32) pl->socket.fd, &tmp_read);
          FD_SET ((uint32) pl->socket.fd, &tmp_write);
          FD_SET ((uint32) pl->socket.fd, &tmp_exceptions);
          pl = pl->next;
        }
    }

  /* Reset timeout each time, since some OS's will change the values on
   * the return from select.
   */
  socket_info.timeout.tv_sec = 0;
  socket_info.timeout.tv_usec = 0;

  pollret = select (socket_info.max_filedescriptor, &tmp_read, &tmp_write, &tmp_exceptions, &socket_info.timeout);

  if (pollret == -1)
    {
      LOG (llevError, "select failed: %s\n", strerror (errno));
      return;
    }

  /* We need to do some of the processing below regardless */

/*    if (!pollret) return;*/

  /* Following adds a new connection */
  if (pollret && FD_ISSET (init_sockets[0].fd, &tmp_read))
    {
      int newsocknum = 0;

#ifdef ESRV_DEBUG
      LOG (llevDebug, "doeric_server: New Connection\n");
#endif
      /* If this is the case, all sockets currently in used */
      if (socket_info.allocated_sockets <= socket_info.nconns)
        {
          init_sockets = (NewSocket *) realloc (init_sockets, sizeof (NewSocket) * (socket_info.nconns + 1));
          if (!init_sockets)
            fatal (OUT_OF_MEMORY);
          newsocknum = socket_info.allocated_sockets;
          socket_info.allocated_sockets++;
          init_sockets[newsocknum].faces_sent_len = nrofpixmaps;
          init_sockets[newsocknum].faces_sent = (uint8 *) malloc (nrofpixmaps * sizeof (*init_sockets[newsocknum].faces_sent));
          if (!init_sockets[newsocknum].faces_sent)
            fatal (OUT_OF_MEMORY);
          init_sockets[newsocknum].status = Ns_Avail;
        }
      else
        {
          int j;

          for (j = 1; j < socket_info.allocated_sockets; j++)
            if (init_sockets[j].status == Ns_Avail)
              {
                newsocknum = j;
                break;
              }
        }
      init_sockets[newsocknum].fd = accept (init_sockets[0].fd, (struct sockaddr *) &addr, &addrlen);
      if (init_sockets[newsocknum].fd == -1)
        {
          LOG (llevError, "accept failed: %s\n", strerror (errno));
        }
      else
        {
          char buf[MAX_BUF];
          long ip;
          NewSocket *ns;

          ns = &init_sockets[newsocknum];

          ip = ntohl (addr.sin_addr.s_addr);
          sprintf (buf, "%ld.%ld.%ld.%ld", (ip >> 24) & 255, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);

          if (checkbanned (NULL, buf))
            {
              LOG (llevInfo, "Banned host tried to connect: [%s]\n", buf);
              close (init_sockets[newsocknum].fd);
              init_sockets[newsocknum].fd = -1;
            }
          else
            {
              InitConnection (ns, buf);
              socket_info.nconns++;
            }
        }
    }

  /* Check for any exceptions/input on the sockets */
  if (pollret)
    for (i = 1; i < socket_info.allocated_sockets; i++)
      {
        if (init_sockets[i].status == Ns_Avail)
          continue;
        if (FD_ISSET (init_sockets[i].fd, &tmp_exceptions))
          {
            free_newsocket (&init_sockets[i]);
            init_sockets[i].status = Ns_Avail;
            socket_info.nconns--;
            continue;
          }
        if (FD_ISSET (init_sockets[i].fd, &tmp_read))
          {
            HandleClient (&init_sockets[i], NULL);
          }
        if (FD_ISSET (init_sockets[i].fd, &tmp_write))
          {
            init_sockets[i].can_write = 1;
          }
      }

  /* This does roughly the same thing, but for the players now */
  for (pl = first_player; pl != NULL; pl = next)
    {

      next = pl->next;
      if (pl->socket.status == Ns_Dead)
        continue;

      if (FD_ISSET (pl->socket.fd, &tmp_write))
        {
          if (!pl->socket.can_write)
            {
#if 0
              LOG (llevDebug, "Player %s socket now write enabled\n", pl->ob->name);
#endif
              pl->socket.can_write = 1;
              write_socket_buffer (&pl->socket);
            }
          /* if we get an error on the write_socket buffer, no reason to
           * continue on this socket.
           */
          if (pl->socket.status == Ns_Dead)
            continue;
        }
      else
        pl->socket.can_write = 0;

      if (FD_ISSET (pl->socket.fd, &tmp_exceptions))
        {
          save_player (pl->ob, 0);
          if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
            {
              terminate_all_pets (pl->ob);
              remove_ob (pl->ob);
            }
          leave (pl, 1);
          final_free_player (pl);
        }
      else
        {
          HandleClient (&pl->socket, pl);
          /* If the player has left the game, then the socket status
           * will be set to this be the leave function.  We don't
           * need to call leave again, as it has already been called
           * once.
           */
          if (pl->socket.status == Ns_Dead)
            {
              save_player (pl->ob, 0);
              if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
                {
                  terminate_all_pets (pl->ob);
                  remove_ob (pl->ob);
                }
              leave (pl, 1);
              final_free_player (pl);
            }
          else
            {

              /* Update the players stats once per tick.  More efficient than
               * sending them whenever they change, and probably just as useful
               */
              esrv_update_stats (pl);
              if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
                {
                  esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
                  if (pl->last_weight != WEIGHT (pl->ob))
                    LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
                         (unsigned long) pl->last_weight, WEIGHT (pl->ob));
                }
              /* draw_client_map does sanity checking that map is
               * valid, so don't do it here.
               */
              draw_client_map (pl->ob);
              if (pl->socket.update_look)
                esrv_draw_look (pl->ob);
            }
        }
    }
}
Revision:	1.7
Committed:	Thu Sep 14 22:34:05 2006 UTC (17 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+1 -7 lines
Log Message:	indent
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team
5			Copyright (C) 1992 Frank Tore Johansen
6
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21	root	1.7	The author can be reached via e-mail to <crossfire@schmorp.de>
22	elmex	1.1	*/
23
24			/**
25			* \file
26			* Main client/server loops.
27			*
28			* \date 2003-12-02
29			*
30			* loop.c mainly deals with initialization and higher level socket
31			* maintenance (checking for lost connections and if data has arrived.)
32			* The reading of data is handled in ericserver.c
33			*/
34
35
36			#include <global.h>
37			#ifndef __CEXTRACT__
38	root	1.6	# include <sproto.h>
39			# include <sockproto.h>
40	elmex	1.1	#endif
41
42	root	1.6	#ifndef WIN32 /* ---win32 exclude unix headers */
43			# include <sys/types.h>
44			# include <sys/time.h>
45			# include <sys/socket.h>
46			# include <netinet/in.h>
47			# include <netdb.h>
48	elmex	1.1	#endif /* end win32 */
49
50			#ifdef HAVE_UNISTD_H
51	root	1.6	# include <unistd.h>
52	elmex	1.1	#endif
53
54			#ifdef HAVE_ARPA_INET_H
55	root	1.6	# include <arpa/inet.h>
56	elmex	1.1	#endif
57
58			#include <loader.h>
59			#include <newserver.h>
60
61			/*****************************************************************************
62			* Start of command dispatch area.
63			* The commands here are protocol commands.
64			****************************************************************************/
65
66			/* Either keep this near the start or end of the file so it is
67			* at least reasonablye easy to find.
68			* There are really 2 commands - those which are sent/received
69			* before player joins, and those happen after the player has joined.
70			* As such, we have function types that might be called, so
71			* we end up having 2 tables.
72			*/
73
74	root	1.6	typedef void (func_uint8_int_ns) (char , int, NewSocket *);
75	elmex	1.1
76	root	1.6	struct NsCmdMapping
77			{
78			const char *cmdname;
79			func_uint8_int_ns cmdproc;
80	elmex	1.1	};
81
82	root	1.6	typedef void (func_uint8_int_pl) (char , int, player *);
83			struct PlCmdMapping
84			{
85			const char *cmdname;
86			func_uint8_int_pl cmdproc;
87			uint8 flag;
88	elmex	1.1	};
89
90			/**
91			* Dispatch table for the server.
92			*
93			* CmdMapping is the dispatch table for the server, used in HandleClient,
94			* which gets called when the client has input. All commands called here
95			* use the same parameter form (char* data, int len, int clientnum.
96			* We do implicit casts, because the data that is being passed is
97			* unsigned (pretty much needs to be for binary data), however, most
98			* of these treat it only as strings, so it makes things easier
99			* to cast it here instead of a bunch of times in the function itself.
100			* flag is 1 if the player must be in the playing state to issue the
101			* command, 0 if they can issue it at any time.
102			*/
103			static struct PlCmdMapping plcommands[] = {
104	root	1.6	{"examine", ExamineCmd, 1},
105			{"apply", ApplyCmd, 1},
106			{"move", MoveCmd, 1},
107			{"reply", ReplyCmd, 0},
108			{"command", PlayerCmd, 1},
109			{"ncom", (func_uint8_int_pl) NewPlayerCmd, 1},
110			{"lookat", LookAt, 1},
111			{"lock", (func_uint8_int_pl) LockItem, 1},
112			{"mark", (func_uint8_int_pl) MarkItem, 1},
113			{"mapredraw", MapRedrawCmd, 0}, /* Added: phil */
114			{"mapinfo", MapInfoCmd, 2}, /* CF+ */
115			{"ext", ExtCmd, 2}, /* CF+ */
116			{NULL, NULL, 0} /* terminator */
117	elmex	1.1	};
118
119			/** Face-related commands */
120			static struct NsCmdMapping nscommands[] = {
121	root	1.6	{"addme", AddMeCmd},
122			{"askface", SendFaceCmd}, /* Added: phil */
123			{"requestinfo", RequestInfo},
124			{"setfacemode", SetFaceMode},
125			{"setsound", SetSound},
126			{"setup", SetUp},
127			{"version", VersionCmd},
128			{"toggleextendedinfos", ToggleExtendedInfos}, /Added: tchize /
129			{"toggleextendedtext", ToggleExtendedText}, /Added: tchize /
130			{"asksmooth", AskSmooth}, /Added: tchize (smoothing technologies) /
131			{NULL, NULL} /* terminator (I, II & III) */
132	elmex	1.1	};
133
134			/**
135			* RequestInfo is sort of a meta command. There is some specific
136			* request of information, but we call other functions to provide
137			* that information.
138			*/
139	root	1.6	void
140			RequestInfo (char buf, int len, NewSocket ns)
141	elmex	1.1	{
142	root	1.6	char params = NULL, cp;
143
144			/* No match */
145			char bigbuf[MAX_BUF];
146			int slen;
147
148			/* Set up replyinfo before we modify any of the buffers - this is used
149			* if we don't find a match.
150			*/
151			strcpy (bigbuf, "replyinfo ");
152			slen = strlen (bigbuf);
153			safe_strcat (bigbuf, buf, &slen, MAX_BUF);
154
155			/* find the first space, make it null, and update the
156			* params pointer.
157			*/
158			for (cp = buf; *cp != '\0'; cp++)
159			if (*cp == ' ')
160			{
161			*cp = '\0';
162			params = cp + 1;
163			break;
164			}
165			if (!strcmp (buf, "image_info"))
166			send_image_info (ns, params);
167			else if (!strcmp (buf, "image_sums"))
168			send_image_sums (ns, params);
169			else if (!strcmp (buf, "skill_info"))
170			send_skill_info (ns, params);
171			else if (!strcmp (buf, "spell_paths"))
172			send_spell_paths (ns, params);
173			else
174			Write_String_To_Socket (ns, bigbuf, len);
175	elmex	1.1	}
176
177			/**
178			* Handle client input.
179			*
180			* HandleClient is actually not named really well - we only get here once
181			* there is input, so we don't do exception or other stuff here.
182			* sock is the output socket information. pl is the player associated
183			* with this socket, null if no player (one of the init_sockets for just
184			* starting a connection)
185			*/
186
187	root	1.6	void
188			HandleClient (NewSocket * ns, player *pl)
189	elmex	1.1	{
190	root	1.6	int len = 0, i, cnt;
191			char *data;
192	elmex	1.1
193	root	1.6	/* Loop through this - maybe we have several complete packets here. */
194			// limit to a few commands only, though, as to not monopolise the server
195			for (cnt = 16; cnt--;)
196			{
197			/* If it is a player, and they don't have any speed left, we
198			* return, and will read in the data when they do have time.
199			*/
200			if (pl && pl->state == ST_PLAYING && pl->ob != NULL && pl->ob->speed_left < 0)
201			{
202			return;
203	root	1.3	}
204	elmex	1.1
205	root	1.6	i = SockList_ReadPacket (ns->fd, &ns->inbuf, MAXSOCKBUF - 1);
206
207			if (i < 0)
208			{
209	elmex	1.1	#ifdef ESRV_DEBUG
210	root	1.6	LOG (llevDebug, "HandleClient: Read error on connection player %s\n", (pl ? pl->ob->name : "None"));
211	elmex	1.1	#endif
212	root	1.6	/* Caller will take care of cleaning this up */
213			ns->status = Ns_Dead;
214			return;
215	root	1.3	}
216	root	1.6	/* Still dont have a full packet */
217			if (i == 0)
218			return;
219	elmex	1.1
220			// //D//TODO//temporarily log long commands
221			// if (ns->inbuf.len >= 40 && pl && pl->ob)
222			// LOG (llevDebug, "HandleClient: long comamnd from <%s,%s> %d<%s>\n", pl->ob->name, ns->host, ns->inbuf.len, ns->inbuf.buf + 2);
223
224	root	1.6	/* First, break out beginning word. There are at least
225			* a few commands that do not have any paremeters. If
226			* we get such a command, don't worry about trying
227			* to break it up.
228			*/
229			data = (char ) strchr ((char ) ns->inbuf.buf + 2, ' ');
230			if (data)
231			{
232			*data = '\0';
233			data++;
234			len = ns->inbuf.len - (data - (char *) ns->inbuf.buf);
235			}
236			else
237			len = 0;
238
239			ns->inbuf.buf[ns->inbuf.len] = '\0'; /* Terminate buffer - useful for string data */
240			for (i = 0; nscommands[i].cmdname != NULL; i++)
241			{
242			if (strcmp ((char *) ns->inbuf.buf + 2, nscommands[i].cmdname) == 0)
243			{
244			nscommands[i].cmdproc ((char *) data, len, ns);
245			ns->inbuf.len = 0;
246			return; //D// not doing this causes random memory corruption
247			goto next_packet;
248	root	1.3	}
249			}
250	root	1.6	/* Player must be in the playing state or the flag on the
251			* the command must be zero for the user to use the command -
252			* otherwise, a player cam save, be in the play_again state, and
253			* the map they were on gets swapped out, yet things that try to look
254			* at the map causes a crash. If the command is valid, but
255			* one they can't use, we still swallow it up.
256			*/
257			if (pl)
258			for (i = 0; plcommands[i].cmdname != NULL; i++)
259			{
260			if (strcmp ((char *) ns->inbuf.buf + 2, plcommands[i].cmdname) == 0)
261			{
262	root	1.3	if (pl->state == ST_PLAYING \|\| !(plcommands[i].flag & 1))
263	root	1.6	plcommands[i].cmdproc ((char *) data, len, pl);
264			ns->inbuf.len = 0;
265	elmex	1.1	//D// not doing this causes random memory corruption
266			if (plcommands[i].flag & 2)
267			goto next_packet;
268			return;
269	root	1.6	}
270			}
271			/* If we get here, we didn't find a valid command. Logging
272			* this might be questionable, because a broken client/malicious
273			* user could certainly send a whole bunch of invalid commands.
274			*/
275			LOG (llevDebug, "Bad command from client (%s)\n", ns->inbuf.buf + 2);
276	elmex	1.1	next_packet:
277	root	1.6	;
278	elmex	1.1	}
279			}
280
281
282			/*****************************************************************************
283			*
284			* Low level socket looping - select calls and watchdog udp packet
285			* sending.
286			*
287			******************************************************************************/
288
289			#ifdef WATCHDOG
290	root	1.6
291	elmex	1.1	/**
292			* Tell watchdog that we are still alive
293			*
294			* I put the function here since we should hopefully already be getting
295			* all the needed include files for socket support
296			*/
297
298	root	1.6	void
299			watchdog (void)
300	elmex	1.1	{
301	root	1.6	static int fd = -1;
302	elmex	1.1	static struct sockaddr_in insock;
303
304	root	1.6	if (fd == -1)
305	elmex	1.1	{
306			struct protoent *protoent;
307
308	root	1.6	if ((protoent = getprotobyname ("udp")) == NULL \|\| (fd = socket (PF_INET, SOCK_DGRAM, protoent->p_proto)) == -1)
309			{
310			return;
311			}
312			insock.sin_family = AF_INET;
313			insock.sin_port = htons ((unsigned short) 13325);
314			insock.sin_addr.s_addr = inet_addr ("127.0.0.1");
315	elmex	1.1	}
316	root	1.6	sendto (fd, (void ) &fd, 1, 0, (struct sockaddr ) &insock, sizeof (insock));
317	elmex	1.1	}
318			#endif
319
320	root	1.6	void
321			flush_sockets (void)
322	elmex	1.1	{
323			player *pl;
324
325			for (pl = first_player; pl != NULL; pl = pl->next)
326			if (pl->socket.status != Ns_Dead)
327			Socket_Flush (&pl->socket);
328			}
329
330			/**
331			* This checks the sockets for input and exceptions, does the right thing.
332			*
333			* A bit of this code is grabbed out of socket.c
334			* There are 2 lists we need to look through - init_sockets is a list
335			*
336			*/
337	root	1.6	void
338			doeric_server (void)
339	elmex	1.1	{
340	root	1.6	int i, pollret;
341			fd_set tmp_read, tmp_exceptions, tmp_write;
342			struct sockaddr_in addr;
343			socklen_t addrlen = sizeof (struct sockaddr);
344			player pl, next;
345	elmex	1.1
346			#ifdef CS_LOGSTATS
347	root	1.6	if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
348			write_cs_stats ();
349	elmex	1.1	#endif
350
351	root	1.6	FD_ZERO (&tmp_read);
352			FD_ZERO (&tmp_write);
353			FD_ZERO (&tmp_exceptions);
354
355			for (i = 0; i < socket_info.allocated_sockets; i++)
356			{
357			if (init_sockets[i].status == Ns_Dead)
358			{
359			free_newsocket (&init_sockets[i]);
360			init_sockets[i].status = Ns_Avail;
361			socket_info.nconns--;
362			}
363			else if (init_sockets[i].status != Ns_Avail)
364			{
365			FD_SET ((uint32) init_sockets[i].fd, &tmp_read);
366			FD_SET ((uint32) init_sockets[i].fd, &tmp_write);
367			FD_SET ((uint32) init_sockets[i].fd, &tmp_exceptions);
368	root	1.3	}
369	elmex	1.1	}
370
371	root	1.6	/* Go through the players. Let the loop set the next pl value,
372			* since we may remove some
373			*/
374			for (pl = first_player; pl != NULL;)
375			{
376			if (pl->socket.status == Ns_Dead)
377			{
378			player *npl = pl->next;
379
380			save_player (pl->ob, 0);
381			if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
382			{
383			terminate_all_pets (pl->ob);
384			remove_ob (pl->ob);
385	root	1.3	}
386	root	1.6	leave (pl, 1);
387			final_free_player (pl);
388			pl = npl;
389			}
390			else
391			{
392			FD_SET ((uint32) pl->socket.fd, &tmp_read);
393			FD_SET ((uint32) pl->socket.fd, &tmp_write);
394			FD_SET ((uint32) pl->socket.fd, &tmp_exceptions);
395			pl = pl->next;
396	root	1.3	}
397	elmex	1.1	}
398
399	root	1.6	/* Reset timeout each time, since some OS's will change the values on
400			* the return from select.
401			*/
402			socket_info.timeout.tv_sec = 0;
403			socket_info.timeout.tv_usec = 0;
404	elmex	1.1
405	root	1.6	pollret = select (socket_info.max_filedescriptor, &tmp_read, &tmp_write, &tmp_exceptions, &socket_info.timeout);
406	elmex	1.1
407	root	1.6	if (pollret == -1)
408			{
409			LOG (llevError, "select failed: %s\n", strerror (errno));
410			return;
411	elmex	1.1	}
412
413	root	1.6	/* We need to do some of the processing below regardless */
414
415	elmex	1.1	/* if (!pollret) return;*/
416
417	root	1.6	/* Following adds a new connection */
418			if (pollret && FD_ISSET (init_sockets[0].fd, &tmp_read))
419			{
420			int newsocknum = 0;
421	elmex	1.1
422			#ifdef ESRV_DEBUG
423	root	1.6	LOG (llevDebug, "doeric_server: New Connection\n");
424	elmex	1.1	#endif
425	root	1.6	/* If this is the case, all sockets currently in used */
426			if (socket_info.allocated_sockets <= socket_info.nconns)
427			{
428			init_sockets = (NewSocket ) realloc (init_sockets, sizeof (NewSocket) (socket_info.nconns + 1));
429			if (!init_sockets)
430			fatal (OUT_OF_MEMORY);
431			newsocknum = socket_info.allocated_sockets;
432			socket_info.allocated_sockets++;
433			init_sockets[newsocknum].faces_sent_len = nrofpixmaps;
434			init_sockets[newsocknum].faces_sent = (uint8 ) malloc (nrofpixmaps sizeof (*init_sockets[newsocknum].faces_sent));
435			if (!init_sockets[newsocknum].faces_sent)
436			fatal (OUT_OF_MEMORY);
437			init_sockets[newsocknum].status = Ns_Avail;
438			}
439			else
440			{
441			int j;
442
443			for (j = 1; j < socket_info.allocated_sockets; j++)
444			if (init_sockets[j].status == Ns_Avail)
445			{
446			newsocknum = j;
447			break;
448			}
449			}
450			init_sockets[newsocknum].fd = accept (init_sockets[0].fd, (struct sockaddr *) &addr, &addrlen);
451			if (init_sockets[newsocknum].fd == -1)
452			{
453			LOG (llevError, "accept failed: %s\n", strerror (errno));
454			}
455			else
456			{
457			char buf[MAX_BUF];
458			long ip;
459			NewSocket *ns;
460
461			ns = &init_sockets[newsocknum];
462
463			ip = ntohl (addr.sin_addr.s_addr);
464			sprintf (buf, "%ld.%ld.%ld.%ld", (ip >> 24) & 255, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
465
466			if (checkbanned (NULL, buf))
467			{
468			LOG (llevInfo, "Banned host tried to connect: [%s]\n", buf);
469			close (init_sockets[newsocknum].fd);
470			init_sockets[newsocknum].fd = -1;
471	root	1.3	}
472	root	1.6	else
473			{
474			InitConnection (ns, buf);
475			socket_info.nconns++;
476	root	1.3	}
477			}
478	elmex	1.1	}
479
480	root	1.6	/* Check for any exceptions/input on the sockets */
481			if (pollret)
482			for (i = 1; i < socket_info.allocated_sockets; i++)
483			{
484			if (init_sockets[i].status == Ns_Avail)
485			continue;
486			if (FD_ISSET (init_sockets[i].fd, &tmp_exceptions))
487			{
488			free_newsocket (&init_sockets[i]);
489	root	1.3	init_sockets[i].status = Ns_Avail;
490			socket_info.nconns--;
491			continue;
492	root	1.6	}
493			if (FD_ISSET (init_sockets[i].fd, &tmp_read))
494			{
495			HandleClient (&init_sockets[i], NULL);
496			}
497			if (FD_ISSET (init_sockets[i].fd, &tmp_write))
498			{
499			init_sockets[i].can_write = 1;
500			}
501			}
502	elmex	1.1
503	root	1.6	/* This does roughly the same thing, but for the players now */
504			for (pl = first_player; pl != NULL; pl = next)
505			{
506	elmex	1.1
507	root	1.6	next = pl->next;
508			if (pl->socket.status == Ns_Dead)
509			continue;
510
511			if (FD_ISSET (pl->socket.fd, &tmp_write))
512			{
513			if (!pl->socket.can_write)
514			{
515	elmex	1.1	#if 0
516	root	1.6	LOG (llevDebug, "Player %s socket now write enabled\n", pl->ob->name);
517	elmex	1.1	#endif
518	root	1.6	pl->socket.can_write = 1;
519			write_socket_buffer (&pl->socket);
520	root	1.3	}
521	root	1.6	/* if we get an error on the write_socket buffer, no reason to
522			* continue on this socket.
523			*/
524			if (pl->socket.status == Ns_Dead)
525			continue;
526			}
527			else
528			pl->socket.can_write = 0;
529
530			if (FD_ISSET (pl->socket.fd, &tmp_exceptions))
531			{
532			save_player (pl->ob, 0);
533			if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
534			{
535			terminate_all_pets (pl->ob);
536			remove_ob (pl->ob);
537	root	1.3	}
538	root	1.6	leave (pl, 1);
539			final_free_player (pl);
540	root	1.3	}
541	root	1.6	else
542			{
543			HandleClient (&pl->socket, pl);
544			/* If the player has left the game, then the socket status
545			* will be set to this be the leave function. We don't
546			* need to call leave again, as it has already been called
547			* once.
548			*/
549			if (pl->socket.status == Ns_Dead)
550			{
551			save_player (pl->ob, 0);
552			if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
553			{
554			terminate_all_pets (pl->ob);
555			remove_ob (pl->ob);
556	root	1.3	}
557	root	1.6	leave (pl, 1);
558			final_free_player (pl);
559			}
560			else
561			{
562
563			/* Update the players stats once per tick. More efficient than
564			* sending them whenever they change, and probably just as useful
565			*/
566			esrv_update_stats (pl);
567			if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
568			{
569			esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
570			if (pl->last_weight != WEIGHT (pl->ob))
571			LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
572			(unsigned long) pl->last_weight, WEIGHT (pl->ob));
573	root	1.3	}
574	root	1.6	/* draw_client_map does sanity checking that map is
575			* valid, so don't do it here.
576			*/
577			draw_client_map (pl->ob);
578			if (pl->socket.update_look)
579			esrv_draw_look (pl->ob);
580	root	1.3	}
581			}
582	elmex	1.1	}
583			}