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>
#include <sproto.h>
#include <sockproto.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#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, client_socket *);

struct NsCmdMapping
{
  const char *cmdname;
  func_uint8_int_ns cmdproc;
  uint8 flag;
};

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+ */
  { 0 }               /* terminator */
};

/** Face-related commands */
static struct NsCmdMapping nscommands[] = {
  {"addme", AddMeCmd, 2},
  {"askface", SendFaceCmd},     /* Added: phil */
  {"requestinfo", RequestInfo},
  {"setfacemode", SetFaceMode, 2},
  {"setsound", SetSound, 2},
  {"setup", SetUp, 2},
  {"version", VersionCmd, 2},
  {"toggleextendedinfos", ToggleExtendedInfos, 2}, /*Added: tchize */
  {"toggleextendedtext", ToggleExtendedText, 2},   /*Added: tchize */
  {"asksmooth", AskSmooth},     /*Added: tchize (smoothing technologies) */
  { 0 }                  /* 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, client_socket * 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
    ns->send_packet (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 (client_socket *ns, player *pl)
{
  /* Loop through this - maybe we have several complete packets here. */
  // limit to a few commands only, though, as to not monopolise the server
  for (int repeat = 16; repeat--;)
    {
      /* 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 && pl->ob->speed_left < 0)
        return;

      int pkt_len = ns->read_packet ();

      if (pkt_len < 0)
        {
          LOG (llevError, "read error on player %s\n", &pl->ob->name);
          /* Caller will take care of cleaning this up */
          ns->status = Ns_Dead;
          return;
        }
      else if (pkt_len == 0)
        /* Still dont have a full packet */
        return;

      /* 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.
       */
      int datalen;
      char *data = strchr ((char *)ns->inbuf + 2, ' ');

      if (data)
        {
          *data++ = 0;
          datalen = pkt_len - (data - (char *)ns->inbuf);
        }
      else
        {
          data = (char *)ns->inbuf + 2; // better read garbage than segfault
          datalen = 0;
        }

      ns->inbuf [pkt_len] = 0;      /* Terminate buffer - useful for string data */

      for (int i = 0; nscommands[i].cmdname; i++)
        {
          if (!strcmp ((char *)ns->inbuf + 2, nscommands[i].cmdname))
            {
              nscommands[i].cmdproc (data, datalen, ns);
              ns->skip_packet (pkt_len);
              //D// not doing this causes random memory corruption
              if (nscommands[i].flag & 2)
                goto next_packet;
              return;
            }
        }

      /* 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 (int i = 0; plcommands[i].cmdname; i++)
          {
            if (!strcmp ((char *)ns->inbuf + 2, plcommands[i].cmdname))
              {
                if (pl->state == ST_PLAYING || !(plcommands[i].flag & 1))
                  plcommands[i].cmdproc ((char *) data, datalen, pl);

                ns->skip_packet (pkt_len);
                //D// not doing this causes random memory corruption
                if (plcommands[i].flag & 2)
                  goto next_packet;

                return;
              }
          }

      printf ("BP34n");//D
      /* 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 + 2);
      ns->skip_packet (pkt_len);
    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, 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_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);

  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 (init_sockets[i].fd, &tmp_read);
          FD_SET (init_sockets[i].fd, &tmp_write);
        }
    }

  /* 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);
              pl->ob->remove ();
            }

          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);
          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, 0,
                    &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 = (client_socket *) realloc (init_sockets, sizeof (client_socket) * (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;
          client_socket *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
            {
              ns->init (buf);
              socket_info.nconns++;
            }
        }
    }

  /* Check for any input on the sockets */
  if (pollret)
    for (i = 1; i < socket_info.allocated_sockets; i++)
      {
        if (init_sockets[i].status == Ns_Avail)
          continue;

        //TODO: disassociate handleclient from socket readin
        if (init_sockets[i].inbuf_len || 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;

      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);
              pl->ob->remove ();
            }

          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:	1.13
Committed:	Thu Dec 14 02:37:37 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+6 -6 lines
Log Message:	moar\! rewrite\!
#	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	root	1.10	#include <sproto.h>
38			#include <sockproto.h>
39	elmex	1.1
40	pippijn	1.8	#include <sys/types.h>
41			#include <sys/time.h>
42			#include <sys/socket.h>
43			#include <netinet/in.h>
44			#include <netdb.h>
45	elmex	1.1
46			#ifdef HAVE_UNISTD_H
47	root	1.6	# include <unistd.h>
48	elmex	1.1	#endif
49
50			#ifdef HAVE_ARPA_INET_H
51	root	1.6	# include <arpa/inet.h>
52	elmex	1.1	#endif
53
54			#include <loader.h>
55			#include <newserver.h>
56
57			/*****************************************************************************
58			* Start of command dispatch area.
59			* The commands here are protocol commands.
60			****************************************************************************/
61
62			/* Either keep this near the start or end of the file so it is
63			* at least reasonablye easy to find.
64			* There are really 2 commands - those which are sent/received
65			* before player joins, and those happen after the player has joined.
66			* As such, we have function types that might be called, so
67			* we end up having 2 tables.
68			*/
69
70	root	1.13	typedef void (func_uint8_int_ns) (char , int, client_socket *);
71	elmex	1.1
72	root	1.6	struct NsCmdMapping
73			{
74			const char *cmdname;
75			func_uint8_int_ns cmdproc;
76	root	1.11	uint8 flag;
77	elmex	1.1	};
78
79	root	1.6	typedef void (func_uint8_int_pl) (char , int, player *);
80			struct PlCmdMapping
81			{
82			const char *cmdname;
83			func_uint8_int_pl cmdproc;
84			uint8 flag;
85	elmex	1.1	};
86
87			/**
88			* Dispatch table for the server.
89			*
90			* CmdMapping is the dispatch table for the server, used in HandleClient,
91			* which gets called when the client has input. All commands called here
92			* use the same parameter form (char* data, int len, int clientnum.
93			* We do implicit casts, because the data that is being passed is
94			* unsigned (pretty much needs to be for binary data), however, most
95			* of these treat it only as strings, so it makes things easier
96			* to cast it here instead of a bunch of times in the function itself.
97			* flag is 1 if the player must be in the playing state to issue the
98			* command, 0 if they can issue it at any time.
99			*/
100			static struct PlCmdMapping plcommands[] = {
101	root	1.6	{"examine", ExamineCmd, 1},
102			{"apply", ApplyCmd, 1},
103			{"move", MoveCmd, 1},
104			{"reply", ReplyCmd, 0},
105			{"command", PlayerCmd, 1},
106			{"ncom", (func_uint8_int_pl) NewPlayerCmd, 1},
107			{"lookat", LookAt, 1},
108			{"lock", (func_uint8_int_pl) LockItem, 1},
109			{"mark", (func_uint8_int_pl) MarkItem, 1},
110			{"mapredraw", MapRedrawCmd, 0}, /* Added: phil */
111			{"mapinfo", MapInfoCmd, 2}, /* CF+ */
112			{"ext", ExtCmd, 2}, /* CF+ */
113	root	1.11	{ 0 } /* terminator */
114	elmex	1.1	};
115
116			/** Face-related commands */
117			static struct NsCmdMapping nscommands[] = {
118	root	1.11	{"addme", AddMeCmd, 2},
119	root	1.6	{"askface", SendFaceCmd}, /* Added: phil */
120			{"requestinfo", RequestInfo},
121	root	1.11	{"setfacemode", SetFaceMode, 2},
122			{"setsound", SetSound, 2},
123			{"setup", SetUp, 2},
124			{"version", VersionCmd, 2},
125			{"toggleextendedinfos", ToggleExtendedInfos, 2}, /Added: tchize /
126			{"toggleextendedtext", ToggleExtendedText, 2}, /Added: tchize /
127	root	1.6	{"asksmooth", AskSmooth}, /Added: tchize (smoothing technologies) /
128	root	1.11	{ 0 } /* terminator (I, II & III) */
129	elmex	1.1	};
130
131			/**
132			* RequestInfo is sort of a meta command. There is some specific
133			* request of information, but we call other functions to provide
134			* that information.
135			*/
136	root	1.6	void
137	root	1.13	RequestInfo (char buf, int len, client_socket ns)
138	elmex	1.1	{
139	root	1.6	char params = NULL, cp;
140
141			/* No match */
142			char bigbuf[MAX_BUF];
143			int slen;
144
145			/* Set up replyinfo before we modify any of the buffers - this is used
146			* if we don't find a match.
147			*/
148			strcpy (bigbuf, "replyinfo ");
149			slen = strlen (bigbuf);
150			safe_strcat (bigbuf, buf, &slen, MAX_BUF);
151
152			/* find the first space, make it null, and update the
153			* params pointer.
154			*/
155			for (cp = buf; *cp != '\0'; cp++)
156			if (*cp == ' ')
157			{
158			*cp = '\0';
159			params = cp + 1;
160			break;
161			}
162	root	1.10
163	root	1.6	if (!strcmp (buf, "image_info"))
164			send_image_info (ns, params);
165			else if (!strcmp (buf, "image_sums"))
166			send_image_sums (ns, params);
167			else if (!strcmp (buf, "skill_info"))
168			send_skill_info (ns, params);
169			else if (!strcmp (buf, "spell_paths"))
170			send_spell_paths (ns, params);
171			else
172	root	1.12	ns->send_packet (bigbuf, len);
173	elmex	1.1	}
174
175			/**
176			* Handle client input.
177			*
178			* HandleClient is actually not named really well - we only get here once
179			* there is input, so we don't do exception or other stuff here.
180			* sock is the output socket information. pl is the player associated
181			* with this socket, null if no player (one of the init_sockets for just
182			* starting a connection)
183			*/
184
185	root	1.6	void
186	root	1.13	HandleClient (client_socket ns, player pl)
187	elmex	1.1	{
188	root	1.6	/* Loop through this - maybe we have several complete packets here. */
189			// limit to a few commands only, though, as to not monopolise the server
190	root	1.11	for (int repeat = 16; repeat--;)
191	root	1.6	{
192			/* If it is a player, and they don't have any speed left, we
193			* return, and will read in the data when they do have time.
194			*/
195	root	1.11	if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0)
196			return;
197	elmex	1.1
198	root	1.11	int pkt_len = ns->read_packet ();
199	root	1.6
200	root	1.11	if (pkt_len < 0)
201	root	1.6	{
202	root	1.11	LOG (llevError, "read error on player %s\n", &pl->ob->name);
203	root	1.6	/* Caller will take care of cleaning this up */
204			ns->status = Ns_Dead;
205			return;
206	root	1.3	}
207	root	1.11	else if (pkt_len == 0)
208			/* Still dont have a full packet */
209	root	1.6	return;
210	elmex	1.1
211	root	1.6	/* First, break out beginning word. There are at least
212			* a few commands that do not have any paremeters. If
213			* we get such a command, don't worry about trying
214			* to break it up.
215			*/
216	root	1.11	int datalen;
217			char data = strchr ((char )ns->inbuf + 2, ' ');
218
219	root	1.6	if (data)
220			{
221	root	1.11	*data++ = 0;
222			datalen = pkt_len - (data - (char *)ns->inbuf);
223	root	1.6	}
224			else
225	root	1.11	{
226			data = (char *)ns->inbuf + 2; // better read garbage than segfault
227			datalen = 0;
228			}
229
230			ns->inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
231	root	1.6
232	root	1.11	for (int i = 0; nscommands[i].cmdname; i++)
233	root	1.6	{
234	root	1.11	if (!strcmp ((char *)ns->inbuf + 2, nscommands[i].cmdname))
235	root	1.6	{
236	root	1.11	nscommands[i].cmdproc (data, datalen, ns);
237			ns->skip_packet (pkt_len);
238			//D// not doing this causes random memory corruption
239			if (nscommands[i].flag & 2)
240			goto next_packet;
241			return;
242	root	1.3	}
243			}
244	root	1.11
245	root	1.6	/* Player must be in the playing state or the flag on the
246			* the command must be zero for the user to use the command -
247			* otherwise, a player cam save, be in the play_again state, and
248			* the map they were on gets swapped out, yet things that try to look
249			* at the map causes a crash. If the command is valid, but
250			* one they can't use, we still swallow it up.
251			*/
252			if (pl)
253	root	1.11	for (int i = 0; plcommands[i].cmdname; i++)
254	root	1.6	{
255	root	1.11	if (!strcmp ((char *)ns->inbuf + 2, plcommands[i].cmdname))
256	root	1.6	{
257	root	1.3	if (pl->state == ST_PLAYING \|\| !(plcommands[i].flag & 1))
258	root	1.11	plcommands[i].cmdproc ((char *) data, datalen, pl);
259
260			ns->skip_packet (pkt_len);
261	elmex	1.1	//D// not doing this causes random memory corruption
262			if (plcommands[i].flag & 2)
263			goto next_packet;
264	root	1.11
265	elmex	1.1	return;
266	root	1.6	}
267			}
268	root	1.11
269			printf ("BP34n");//D
270	root	1.6	/* If we get here, we didn't find a valid command. Logging
271			* this might be questionable, because a broken client/malicious
272			* user could certainly send a whole bunch of invalid commands.
273			*/
274	root	1.11	LOG (llevDebug, "Bad command from client (%s)\n", ns->inbuf + 2);
275			ns->skip_packet (pkt_len);
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	root	1.10	* This checks the sockets for input, does the right thing.
332	elmex	1.1	*
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	root	1.10	fd_set tmp_read, tmp_write;
342	root	1.6	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
354			for (i = 0; i < socket_info.allocated_sockets; i++)
355			{
356			if (init_sockets[i].status == Ns_Dead)
357			{
358			free_newsocket (&init_sockets[i]);
359			init_sockets[i].status = Ns_Avail;
360			socket_info.nconns--;
361			}
362			else if (init_sockets[i].status != Ns_Avail)
363			{
364	root	1.10	FD_SET (init_sockets[i].fd, &tmp_read);
365			FD_SET (init_sockets[i].fd, &tmp_write);
366	root	1.3	}
367	elmex	1.1	}
368
369	root	1.6	/* Go through the players. Let the loop set the next pl value,
370			* since we may remove some
371			*/
372			for (pl = first_player; pl != NULL;)
373			{
374			if (pl->socket.status == Ns_Dead)
375			{
376			player *npl = pl->next;
377
378			save_player (pl->ob, 0);
379	root	1.10
380	root	1.6	if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
381			{
382			terminate_all_pets (pl->ob);
383	root	1.9	pl->ob->remove ();
384	root	1.3	}
385	root	1.10
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			pl = pl->next;
395	root	1.3	}
396	elmex	1.1	}
397
398	root	1.6	/* Reset timeout each time, since some OS's will change the values on
399			* the return from select.
400			*/
401	root	1.10	socket_info.timeout.tv_sec = 0;
402	root	1.6	socket_info.timeout.tv_usec = 0;
403	elmex	1.1
404	root	1.10	pollret = select (socket_info.max_filedescriptor,
405			&tmp_read, &tmp_write, 0,
406			&socket_info.timeout);
407	elmex	1.1
408	root	1.6	if (pollret == -1)
409			{
410			LOG (llevError, "select failed: %s\n", strerror (errno));
411			return;
412	elmex	1.1	}
413
414	root	1.6	/* We need to do some of the processing below regardless */
415
416	elmex	1.1	/* if (!pollret) return;*/
417
418	root	1.6	/* Following adds a new connection */
419			if (pollret && FD_ISSET (init_sockets[0].fd, &tmp_read))
420			{
421			int newsocknum = 0;
422	elmex	1.1
423			#ifdef ESRV_DEBUG
424	root	1.6	LOG (llevDebug, "doeric_server: New Connection\n");
425	elmex	1.1	#endif
426	root	1.6	/* If this is the case, all sockets currently in used */
427			if (socket_info.allocated_sockets <= socket_info.nconns)
428			{
429	root	1.13	init_sockets = (client_socket ) realloc (init_sockets, sizeof (client_socket) (socket_info.nconns + 1));
430	root	1.6	if (!init_sockets)
431			fatal (OUT_OF_MEMORY);
432			newsocknum = socket_info.allocated_sockets;
433			socket_info.allocated_sockets++;
434			init_sockets[newsocknum].faces_sent_len = nrofpixmaps;
435			init_sockets[newsocknum].faces_sent = (uint8 ) malloc (nrofpixmaps sizeof (*init_sockets[newsocknum].faces_sent));
436			if (!init_sockets[newsocknum].faces_sent)
437			fatal (OUT_OF_MEMORY);
438			init_sockets[newsocknum].status = Ns_Avail;
439			}
440			else
441			{
442			int j;
443
444			for (j = 1; j < socket_info.allocated_sockets; j++)
445			if (init_sockets[j].status == Ns_Avail)
446			{
447			newsocknum = j;
448			break;
449			}
450			}
451	root	1.10
452	root	1.6	init_sockets[newsocknum].fd = accept (init_sockets[0].fd, (struct sockaddr *) &addr, &addrlen);
453	root	1.10
454	root	1.6	if (init_sockets[newsocknum].fd == -1)
455	root	1.10	LOG (llevError, "accept failed: %s\n", strerror (errno));
456	root	1.6	else
457			{
458			char buf[MAX_BUF];
459			long ip;
460	root	1.13	client_socket *ns;
461	root	1.6
462			ns = &init_sockets[newsocknum];
463
464			ip = ntohl (addr.sin_addr.s_addr);
465			sprintf (buf, "%ld.%ld.%ld.%ld", (ip >> 24) & 255, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
466
467			if (checkbanned (NULL, buf))
468			{
469			LOG (llevInfo, "Banned host tried to connect: [%s]\n", buf);
470			close (init_sockets[newsocknum].fd);
471			init_sockets[newsocknum].fd = -1;
472	root	1.3	}
473	root	1.6	else
474			{
475	root	1.13	ns->init (buf);
476	root	1.6	socket_info.nconns++;
477	root	1.3	}
478			}
479	elmex	1.1	}
480
481	root	1.10	/* Check for any input on the sockets */
482	root	1.6	if (pollret)
483			for (i = 1; i < socket_info.allocated_sockets; i++)
484			{
485			if (init_sockets[i].status == Ns_Avail)
486			continue;
487	root	1.10
488	root	1.11	//TODO: disassociate handleclient from socket readin
489			if (init_sockets[i].inbuf_len \|\| FD_ISSET (init_sockets[i].fd, &tmp_read))
490	root	1.10	HandleClient (&init_sockets[i], NULL);
491
492	root	1.6	if (FD_ISSET (init_sockets[i].fd, &tmp_write))
493	root	1.10	init_sockets[i].can_write = 1;
494	root	1.6	}
495	elmex	1.1
496	root	1.6	/* This does roughly the same thing, but for the players now */
497			for (pl = first_player; pl != NULL; pl = next)
498			{
499	elmex	1.1
500	root	1.6	next = pl->next;
501			if (pl->socket.status == Ns_Dead)
502			continue;
503
504			if (FD_ISSET (pl->socket.fd, &tmp_write))
505			{
506			if (!pl->socket.can_write)
507			{
508	elmex	1.1	#if 0
509	root	1.6	LOG (llevDebug, "Player %s socket now write enabled\n", pl->ob->name);
510	elmex	1.1	#endif
511	root	1.6	pl->socket.can_write = 1;
512			write_socket_buffer (&pl->socket);
513	root	1.3	}
514	root	1.10
515	root	1.6	/* if we get an error on the write_socket buffer, no reason to
516			* continue on this socket.
517			*/
518			if (pl->socket.status == Ns_Dead)
519			continue;
520			}
521			else
522			pl->socket.can_write = 0;
523
524	root	1.10	HandleClient (&pl->socket, pl);
525			/* If the player has left the game, then the socket status
526			* will be set to this be the leave function. We don't
527			* need to call leave again, as it has already been called
528			* once.
529			*/
530			if (pl->socket.status == Ns_Dead)
531	root	1.6	{
532			save_player (pl->ob, 0);
533	root	1.10
534	root	1.6	if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
535			{
536			terminate_all_pets (pl->ob);
537	root	1.9	pl->ob->remove ();
538	root	1.3	}
539	root	1.10
540	root	1.6	leave (pl, 1);
541			final_free_player (pl);
542	root	1.3	}
543	root	1.6	else
544			{
545	root	1.10	/* Update the players stats once per tick. More efficient than
546			* sending them whenever they change, and probably just as useful
547	root	1.6	*/
548	root	1.10	esrv_update_stats (pl);
549			if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
550	root	1.6	{
551	root	1.10	esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
552			if (pl->last_weight != WEIGHT (pl->ob))
553			LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
554			(unsigned long) pl->last_weight, WEIGHT (pl->ob));
555	root	1.6	}
556
557	root	1.10	/* draw_client_map does sanity checking that map is
558			* valid, so don't do it here.
559			*/
560			draw_client_map (pl->ob);
561			if (pl->socket.update_look)
562			esrv_draw_look (pl->ob);
563	root	1.3	}
564	elmex	1.1	}
565			}
566	root	1.10