server/socket/lowlevel.C

/*
    CrossFire, A Multiplayer game for X-windows

    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 mark@pyramid.com
*/

/**
 * \file
 * Low-level socket-related functions.
 *
 * \date 2003-12-02
 *
 * Contains some base functions that both the client and server
 * can use.  As such, depending what we are being compiled for will
 * determine what we can include.  the client is designed have
 * CFCLIENT defined as part of its compile flags.
 */

using namespace std;

#include <global.h>
#include <sproto.h>
#include <cstdarg>

#ifdef __linux__
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
#endif

// use a really low timeout, as it doesn't cost any bandwidth, and you can
// easily die in 20 seconds...
#define SOCKET_TIMEOUT1 10 * 1000
#define SOCKET_TIMEOUT2 20 * 1000

void
client::flush ()
{
#ifdef __linux__
  // check time of last ack, and, if too old, kill connection
  struct tcp_info tcpi;
  socklen_t len = sizeof (tcpi);

  if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
    {
      unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;

      rtt    = tcpi.tcpi_rtt;
      rttvar = tcpi.tcpi_rttvar;

      if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL   // ack delayed for 20s
          && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent)       // no data sent for 10s
        {
          LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
               (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
          destroy ();
        }
    }
#endif

  /**
   * Writes data to socket.
   *
   * When the socket is clear to write, and we have backlogged data, this
   * is called to write it out.
   */

  if (!outputbuffer.len || socket_ev.poll () & PE_W)
    return;

  write_outputbuffer ();
}

void
client::write_outputbuffer ()
{
  while (outputbuffer.len)
    {
      int res = write (fd, outputbuffer.data + outputbuffer.start,
                       min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));

      if (res > 0)
        {
          outputbuffer.start += res;
          /* wrap back to start of buffer */
          if (outputbuffer.start == SOCKETBUFSIZE)
            outputbuffer.start = 0;

          outputbuffer.len -= res;
#ifdef CS_LOGSTATS
          cst_tot.obytes += res;
          cst_lst.obytes += res;
#endif
        }
      else if (res == 0)
        {
          LOG (llevError, "socket write failed, connection closed.\n");
          destroy ();
          return;
        }
      else if (errno == EINTR)
        {
          // just retry
        }
      else if (errno == EAGAIN)
        {
          // delay till ready
          socket_ev.poll (socket_ev.poll () | PE_W);
          socket_ev.start ();
          return;
        }
      else
        {
          LOG (llevError, "socket write failed: %s\n", strerror (errno));
          destroy ();
          return;
        }
    }

  socket_ev.poll (socket_ev.poll () & ~PE_W);
}

/******************************************************************************
 *
 * Start of read routines.
 *
 ******************************************************************************/

int
client::next_packet ()
{
  if (inbuf_len >= 2)
    {
      int pkt_len = (inbuf [0] << 8) | inbuf [1];

      if (inbuf_len >= 2 + pkt_len)
        return 2 + pkt_len;

      if (inbuf_len == sizeof (inbuf))
        {
          send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
          destroy ();
          return -1;
        }
    }

  return 0;
}

void
client::skip_packet (int len)
{
  inbuf_len -= len;
  memmove (inbuf, inbuf + len, inbuf_len);
}

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

// SocketCommand, PlayingCommand, should not exist with those ugly casts
#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |

/**
 * Dispatch table for the server.
 */
static struct packet_type packets[] = {
  {"ncom",        PC(NewPlayerCmd) PF_PLAYING },
  {"command",     PC(PlayerCmd)    PF_PLAYING },

  {"examine",     PC(ExamineCmd)   PF_PLAYING },
  {"apply",       PC(ApplyCmd)     PF_PLAYING },
  {"lookat",      PC(LookAt)       PF_PLAYING },
  {"lock",        PC(LockItem)     PF_PLAYING },
  {"mark",        PC(MarkItem)     PF_PLAYING },
  {"move",        PC(MoveCmd)      PF_PLAYING },
  {"ext",         PC(ExtCmd)       0 },            /* CF+ */
  {"mapredraw",   PC(MapRedrawCmd) 0 },       /* Added: phil */
  {"mapinfo",     PC(MapInfoCmd)   0 },   /* CF+ */

  {"reply",       SC(ReplyCmd)     0 },
  {"exti",        SC(ExtiCmd)      0 }, /* CF+ */
  {"addme",       SC(AddMeCmd)     0 },
  {"askface",     SC(SendFaceCmd)  0 },     /* Added: phil */
  {"requestinfo", SC(RequestInfo)  0 },
  {"setfacemode", SC(SetFaceMode)  0 },
  {"setsound",    SC(SetSound)     0 },
  {"setup",       SC(SetUp)        0 },
  {"version",     SC(VersionCmd)   0 },
  {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
  {"toggleextendedtext",  SC(ToggleExtendedText)  0 },   /*Added: tchize */
  {"asksmooth",   SC(AskSmooth)    0 },     /*Added: tchize (smoothing technologies) */
};

bool
client::may_execute (const packet_type *pkt) const
{
  return (!(pkt->flags & PF_PLAYER)  || pl)
      && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING));
}

void
client::execute (const packet_type *pkt, char *data, int datalen)
{
  if (may_execute (pkt))
    {
      //TODO: only one format
      if (pkt->flags & PF_PLAYER)
        ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
      else
        ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
    }
  else
    send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
}

bool
client::handle_packet ()
{
  int pkt_len = next_packet ();

  if (!pkt_len)
    return false;
  else if (pkt_len < 0)
    {
      LOG (llevError, "read error on player %s\n",
                      pl && pl->ob ? &pl->ob->name : "[anonymous]");
      destroy ();
      return false;
    }

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

  /* 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 *)inbuf + 2, ' ');

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

  for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
    if (!strcmp ((char *)inbuf + 2, pkt->name))
      {
        if (pkt->flags & PF_PLAYER)
          queue_command (pkt, data, datalen);
        else
          execute (pkt, data, datalen);

        goto next_packet;
      }

  // If we get here, we didn't find a valid command.
  send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
next_packet:
  skip_packet (pkt_len);

  // input buffer has space again
  socket_ev.poll (socket_ev.poll () | PE_R);

  return true;
}

// callback called when socket is either readable or writable
void
client::socket_cb (iow &w, int got)
{
  //TODO remove when we have better socket cleanup logic
  if (destroyed)
    {
      socket_ev.poll (0);
      return;
    }

  if (got & PE_W)
    {
      write_outputbuffer ();

      if (!outputbuffer.len)
        socket_ev.poll (socket_ev.poll () & ~PE_W);
    }

  if (got & PE_R)
    {
      //TODO: rate-limit tcp connection in better ways, important

      int amount = sizeof (inbuf) - inbuf_len;

      if (!amount)
        {
          // input buffer full
          socket_ev.poll (socket_ev.poll () & ~PE_R);
          return;
        }

      amount = read (fd, inbuf + inbuf_len, amount);

      if (!amount)
        {
          destroy ();
          return;
        }
      else if (amount < 0)
        {
          if (errno != EAGAIN && errno != EINTR)
            {
              LOG (llevError, "read error: %s\n", strerror (errno));
              destroy ();
              return;
            }

          // should not be here, normally
        }
      else
        {
          inbuf_len += amount;

          cst_tot.ibytes += amount;
          cst_lst.ibytes += amount;

          cmd_ev.start ();
        }
    }
}

// called whenever we have additional commands to process
void
client::cmd_cb (iw &w)
{
  if (handle_packet ())
    w.start ();
  else
    flush ();
}

/*******************************************************************************
 *
 * Start of write related routines.
 *
 ******************************************************************************/

/**
 * Adds data to a socket buffer for whatever reason.
 *
 * ns is the socket we are adding the data to, buf is the start of the
 * data, and len is the number of bytes to add.
 */
void
client::send (void *buf_, int len)
{
  char *buf = (char *)buf_;
  char *pos = buf;
  int amt = 0;

  if (destroyed || !buf)
    return;

  if ((len + outputbuffer.len) > SOCKETBUFSIZE)
    {
      LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
      destroy ();
      return;
    }

  int avail, end;

  /* data + end is where we start putting the new data.  The last byte
   * currently in use is actually data + end -1
   */
  end = outputbuffer.start + outputbuffer.len;
  /* The buffer is already in a wrapped state, so adjust end */
  if (end >= SOCKETBUFSIZE)
    end -= SOCKETBUFSIZE;

  avail = SOCKETBUFSIZE - end;

  /* We can all fit it behind the current data without wrapping */
  if (avail >= len)
    memcpy (outputbuffer.data + end, buf, len);
  else
    {
      memcpy (outputbuffer.data + end, buf, avail);
      memcpy (outputbuffer.data, buf + avail, len - avail);
    }

  outputbuffer.len += len;
}

/**
 * Takes a string of data, and writes it out to the socket. A very handy
 * shortcut function.
 */
void
client::send_packet (packet &sl)
{
  if (destroyed)
    return;

  if (sl.length () >= MAXSOCKBUF)
    {
      LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
      /* Almost certainly we've overflowed a buffer, so quit now to make
       * it easier to debug.
       */
      abort ();
    }

  if (!sl.length ())
    return;

  assert (sl.hdrlen == 2);

  sl.buf_ [0] = sl.length () >> 8;
  sl.buf_ [1] = sl.length ()     ;

  send (sl.buf_, sl.length () + sl.hdrlen);
}

void
client::send_packet (const char *buf, int len)
{
  packet sl;

  sl << data (buf, len);
  send_packet (sl);
}

void
client::send_packet (const char *buf)
{
  send_packet (buf, strlen (buf));
}

void
client::send_packet_printf (const char *format, ...)
{
  packet sl;

  va_list ap;
  va_start (ap, format);
  sl.vprintf (format, ap);
  va_end (ap);

  send_packet (sl);
}

/***********************************************************************
 *
 * packet functions/utilities
 *
 **********************************************************************/

packet::packet (const char *name)
{
  reset ();

  int len = strlen (name);
  memcpy (cur, name, len); cur += len;
  *cur++ = ' ';
}

packet &packet::operator <<(const data   &v)
{
  if (room () < v.len)
    reset ();
  else
    {
      if (v.len)
        {
          memcpy (cur, v.ptr, v.len);
          cur += v.len;
        }
    }

  return *this;
}

packet &packet::operator <<(const data8  &v)
{
  unsigned int len = min (v.len, 0x00FF);
  return *this << uint8  (len) << data (v.ptr, len);
}

packet &packet::operator <<(const data16 &v)
{
  unsigned int len = min (v.len, 0xFFFF);
  return *this << uint16 (len) << data (v.ptr, len);
}

packet &packet::operator <<(const char *v)
{
  return *this << data (v, strlen (v ? v : 0));
}

void
packet::vprintf (const char *format, va_list ap)
{
  int size = room ();

  int len = vsnprintf ((char *)cur, size, format, ap);

  if (len >= size)
    return reset ();

  cur += len;
}

/******************************************************************************
 *
 * statistics logging functions.
 *
 ******************************************************************************/

#ifdef CS_LOGSTATS

/* cst_tot is for the life of the server, cst_last is for the last series of
 * stats
 */
CS_Stats cst_tot, cst_lst;

/**
 * Writes out the gathered stats.  We clear cst_lst.
 */
void
write_cs_stats (void)
{
  time_t now = time (NULL);

  /* If no connections recently, don't both to log anything */
  if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
    return;

  /* CSSTAT is put in so scripts can easily find the line */
  LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
       ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
       now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
  cst_lst.ibytes = 0;
  cst_lst.obytes = 0;
  cst_lst.time_start = now;
}
#endif

Revision:	1.28
Committed:	Thu Dec 21 06:12:37 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.27:	+4 -4 lines
Log Message:	- made client a first-class crossfire-perl object (its attachable), but perl support is missing. - added some client events - fixed reply not working after logout
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 1992 Frank Tore Johansen
5
6			This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10
11			This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15
16			You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20			The author can be reached via e-mail to mark@pyramid.com
21			*/
22
23			/**
24			* \file
25			* Low-level socket-related functions.
26			*
27			* \date 2003-12-02
28			*
29			* Contains some base functions that both the client and server
30			* can use. As such, depending what we are being compiled for will
31			* determine what we can include. the client is designed have
32			* CFCLIENT defined as part of its compile flags.
33			*/
34
35			using namespace std;
36
37			#include <global.h>
38			#include <sproto.h>
39	root	1.11	#include <cstdarg>
40	elmex	1.1
41			#ifdef __linux__
42			# include <sys/types.h>
43			# include <sys/socket.h>
44			# include <netinet/in.h>
45			# include <netinet/tcp.h>
46			#endif
47
48			// use a really low timeout, as it doesn't cost any bandwidth, and you can
49			// easily die in 20 seconds...
50	root	1.26	#define SOCKET_TIMEOUT1 10 * 1000
51			#define SOCKET_TIMEOUT2 20 * 1000
52	elmex	1.1
53	root	1.5	void
54	root	1.22	client::flush ()
55	elmex	1.1	{
56			#ifdef __linux__
57			// check time of last ack, and, if too old, kill connection
58			struct tcp_info tcpi;
59			socklen_t len = sizeof (tcpi);
60
61	root	1.20	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
62	elmex	1.1	{
63			unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
64
65	root	1.21	rtt = tcpi.tcpi_rtt;
66			rttvar = tcpi.tcpi_rttvar;
67
68	root	1.26	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
69			&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
70	elmex	1.1	{
71	root	1.20	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
72	root	1.5	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
73	root	1.23	destroy ();
74	elmex	1.1	}
75			}
76	root	1.20	#endif
77
78			/**
79			* Writes data to socket.
80			*
81			* When the socket is clear to write, and we have backlogged data, this
82			* is called to write it out.
83			*/
84
85			if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)
86			return;
87
88			write_outputbuffer ();
89			}
90	elmex	1.1
91	root	1.20	void
92	root	1.22	client::write_outputbuffer ()
93	root	1.20	{
94			while (outputbuffer.len)
95			{
96			int res = write (fd, outputbuffer.data + outputbuffer.start,
97			min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
98	root	1.5
99	root	1.20	if (res > 0)
100			{
101			outputbuffer.start += res;
102			/* wrap back to start of buffer */
103			if (outputbuffer.start == SOCKETBUFSIZE)
104			outputbuffer.start = 0;
105
106			outputbuffer.len -= res;
107			#ifdef CS_LOGSTATS
108			cst_tot.obytes += res;
109			cst_lst.obytes += res;
110	elmex	1.1	#endif
111	root	1.20	}
112			else if (res == 0)
113			{
114			LOG (llevError, "socket write failed, connection closed.\n");
115	root	1.23	destroy ();
116	root	1.20	return;
117			}
118			else if (errno == EINTR)
119			{
120			// just retry
121			}
122			else if (errno == EAGAIN)
123			{
124			// delay till ready
125			socket_ev.poll (socket_ev.poll () \| PE_W);
126			socket_ev.start ();
127			return;
128			}
129			else
130			{
131			LOG (llevError, "socket write failed: %s\n", strerror (errno));
132	root	1.23	destroy ();
133	root	1.20	return;
134			}
135			}
136
137			socket_ev.poll (socket_ev.poll () & ~PE_W);
138	elmex	1.1	}
139
140	root	1.23	/******************************************************************************
141	elmex	1.1	*
142	root	1.23	* Start of read routines.
143	elmex	1.1	*
144	root	1.23	******************************************************************************/
145	elmex	1.1
146	root	1.23	int
147			client::next_packet ()
148	elmex	1.1	{
149	root	1.23	if (inbuf_len >= 2)
150	root	1.11	{
151	root	1.23	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
152
153			if (inbuf_len >= 2 + pkt_len)
154			return 2 + pkt_len;
155
156			if (inbuf_len == sizeof (inbuf))
157	root	1.15	{
158	root	1.23	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
159			destroy ();
160			return -1;
161	root	1.15	}
162	root	1.11	}
163	root	1.9
164	root	1.23	return 0;
165	root	1.11	}
166	root	1.9
167	root	1.23	void
168			client::skip_packet (int len)
169	root	1.11	{
170	root	1.23	inbuf_len -= len;
171			memmove (inbuf, inbuf + len, inbuf_len);
172	elmex	1.1	}
173
174	root	1.23	/*****************************************************************************
175			* Start of command dispatch area.
176			* The commands here are protocol commands.
177			****************************************************************************/
178
179			// SocketCommand, PlayingCommand, should not exist with those ugly casts
180			#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
181			#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
182
183			/**
184			* Dispatch table for the server.
185			*/
186			static struct packet_type packets[] = {
187			{"ncom", PC(NewPlayerCmd) PF_PLAYING },
188			{"command", PC(PlayerCmd) PF_PLAYING },
189
190			{"examine", PC(ExamineCmd) PF_PLAYING },
191			{"apply", PC(ApplyCmd) PF_PLAYING },
192			{"lookat", PC(LookAt) PF_PLAYING },
193			{"lock", PC(LockItem) PF_PLAYING },
194			{"mark", PC(MarkItem) PF_PLAYING },
195			{"move", PC(MoveCmd) PF_PLAYING },
196			{"ext", PC(ExtCmd) 0 }, /* CF+ */
197	root	1.26	{"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
198	root	1.23	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
199
200	root	1.28	{"reply", SC(ReplyCmd) 0 },
201	root	1.26	{"exti", SC(ExtiCmd) 0 }, /* CF+ */
202			{"addme", SC(AddMeCmd) 0 },
203			{"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
204			{"requestinfo", SC(RequestInfo) 0 },
205			{"setfacemode", SC(SetFaceMode) 0 },
206			{"setsound", SC(SetSound) 0 },
207			{"setup", SC(SetUp) 0 },
208			{"version", SC(VersionCmd) 0 },
209			{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
210			{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
211			{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
212	root	1.23	};
213
214			bool
215			client::may_execute (const packet_type *pkt) const
216	elmex	1.1	{
217	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
218			&& (!(pkt->flags & PF_PLAYING) \|\| (pl && pl->state == ST_PLAYING));
219	root	1.11	}
220	root	1.9
221	root	1.23	void
222			client::execute (const packet_type pkt, char data, int datalen)
223	root	1.11	{
224	root	1.23	if (may_execute (pkt))
225			{
226			//TODO: only one format
227			if (pkt->flags & PF_PLAYER)
228			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
229			else
230			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
231			}
232			else
233			send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
234	elmex	1.1	}
235
236	root	1.23	bool
237			client::handle_packet ()
238	root	1.10	{
239	root	1.23	int pkt_len = next_packet ();
240
241			if (!pkt_len)
242			return false;
243			else if (pkt_len < 0)
244			{
245			LOG (llevError, "read error on player %s\n",
246			pl && pl->ob ? &pl->ob->name : "[anonymous]");
247			destroy ();
248			return false;
249			}
250
251			inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
252
253			/* First, break out beginning word. There are at least
254			* a few commands that do not have any paremeters. If
255			* we get such a command, don't worry about trying
256			* to break it up.
257			*/
258			int datalen;
259			char data = strchr ((char )inbuf + 2, ' ');
260
261			if (data)
262			{
263			*data++ = 0;
264			datalen = pkt_len - (data - (char *)inbuf);
265			}
266			else
267			{
268			data = (char *)inbuf + 2; // better read garbage than segfault
269			datalen = 0;
270			}
271	root	1.15
272	root	1.23	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
273			if (!strcmp ((char *)inbuf + 2, pkt->name))
274			{
275	root	1.26	if (pkt->flags & PF_PLAYER)
276			queue_command (pkt, data, datalen);
277			else
278	root	1.23	execute (pkt, data, datalen);
279
280			goto next_packet;
281			}
282
283	root	1.26	// If we get here, we didn't find a valid command.
284	root	1.23	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
285			next_packet:
286			skip_packet (pkt_len);
287	root	1.11
288	root	1.23	// input buffer has space again
289			socket_ev.poll (socket_ev.poll () \| PE_R);
290	root	1.10
291	root	1.23	return true;
292	root	1.10	}
293
294	root	1.23	// callback called when socket is either readable or writable
295			void
296			client::socket_cb (iow &w, int got)
297			{
298			//TODO remove when we have better socket cleanup logic
299	root	1.28	if (destroyed)
300	root	1.23	{
301			socket_ev.poll (0);
302			return;
303			}
304	elmex	1.1
305	root	1.23	if (got & PE_W)
306	root	1.5	{
307	root	1.23	write_outputbuffer ();
308
309			if (!outputbuffer.len)
310			socket_ev.poll (socket_ev.poll () & ~PE_W);
311			}
312	root	1.12
313	root	1.23	if (got & PE_R)
314			{
315			//TODO: rate-limit tcp connection in better ways, important
316	pippijn	1.8
317	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
318
319	root	1.23	if (!amount)
320	root	1.5	{
321	root	1.23	// input buffer full
322			socket_ev.poll (socket_ev.poll () & ~PE_R);
323			return;
324	root	1.3	}
325	elmex	1.1
326	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
327
328			if (!amount)
329	root	1.5	{
330	root	1.23	destroy ();
331			return;
332	root	1.5	}
333	root	1.12	else if (amount < 0)
334	root	1.5	{
335	root	1.12	if (errno != EAGAIN && errno != EINTR)
336	root	1.5	{
337	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
338	root	1.23	destroy ();
339			return;
340	root	1.3	}
341	root	1.12
342	root	1.23	// should not be here, normally
343	root	1.3	}
344	root	1.23	else
345			{
346			inbuf_len += amount;
347	root	1.12
348	root	1.23	cst_tot.ibytes += amount;
349			cst_lst.ibytes += amount;
350	root	1.12
351	root	1.23	cmd_ev.start ();
352			}
353	root	1.5	}
354	root	1.12	}
355
356	root	1.23	// called whenever we have additional commands to process
357	root	1.12	void
358	root	1.23	client::cmd_cb (iw &w)
359	root	1.12	{
360	root	1.26	if (handle_packet ())
361	root	1.23	w.start ();
362			else
363			flush ();
364	elmex	1.1	}
365
366			/*******************************************************************************
367			*
368			* Start of write related routines.
369			*
370			******************************************************************************/
371
372			/**
373			* Adds data to a socket buffer for whatever reason.
374			*
375			* ns is the socket we are adding the data to, buf is the start of the
376			* data, and len is the number of bytes to add.
377			*/
378	root	1.20	void
379	root	1.22	client::send (void *buf_, int len)
380	root	1.20	{
381			char buf = (char )buf_;
382			char *pos = buf;
383			int amt = 0;
384	elmex	1.1
385	root	1.28	if (destroyed \|\| !buf)
386	root	1.23	return;
387	elmex	1.1
388	root	1.20	if ((len + outputbuffer.len) > SOCKETBUFSIZE)
389	root	1.5	{
390	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
391			destroy ();
392	root	1.5	return;
393			}
394
395	root	1.20	int avail, end;
396
397	root	1.5	/* data + end is where we start putting the new data. The last byte
398			* currently in use is actually data + end -1
399			*/
400	root	1.20	end = outputbuffer.start + outputbuffer.len;
401	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
402			if (end >= SOCKETBUFSIZE)
403			end -= SOCKETBUFSIZE;
404	root	1.7
405	root	1.5	avail = SOCKETBUFSIZE - end;
406	elmex	1.1
407	root	1.5	/* We can all fit it behind the current data without wrapping */
408			if (avail >= len)
409	root	1.20	memcpy (outputbuffer.data + end, buf, len);
410	root	1.5	else
411			{
412	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
413			memcpy (outputbuffer.data, buf + avail, len - avail);
414	elmex	1.1	}
415	root	1.7
416	root	1.20	outputbuffer.len += len;
417	elmex	1.1	}
418
419			/**
420			* Takes a string of data, and writes it out to the socket. A very handy
421			* shortcut function.
422			*/
423	root	1.13	void
424	root	1.22	client::send_packet (packet &sl)
425	root	1.13	{
426	root	1.28	if (destroyed)
427	root	1.19	return;
428
429			if (sl.length () >= MAXSOCKBUF)
430			{
431			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
432			/* Almost certainly we've overflowed a buffer, so quit now to make
433			* it easier to debug.
434			*/
435			abort ();
436			}
437
438			if (!sl.length ())
439			return;
440
441			assert (sl.hdrlen == 2);
442
443			sl.buf_ [0] = sl.length () >> 8;
444			sl.buf_ [1] = sl.length () ;
445
446			send (sl.buf_, sl.length () + sl.hdrlen);
447	root	1.13	}
448
449	root	1.5	void
450	root	1.22	client::send_packet (const char *buf, int len)
451	elmex	1.1	{
452	root	1.14	packet sl;
453	elmex	1.1
454	root	1.13	sl << data (buf, len);
455			send_packet (sl);
456	elmex	1.1	}
457
458	root	1.13	void
459	root	1.22	client::send_packet (const char *buf)
460	root	1.13	{
461			send_packet (buf, strlen (buf));
462			}
463	elmex	1.1
464	root	1.23	void
465			client::send_packet_printf (const char *format, ...)
466			{
467			packet sl;
468
469			va_list ap;
470			va_start (ap, format);
471			sl.vprintf (format, ap);
472			va_end (ap);
473
474			send_packet (sl);
475			}
476
477			/***********************************************************************
478			*
479			* packet functions/utilities
480			*
481			**********************************************************************/
482
483	root	1.27	packet::packet (const char *name)
484			{
485			reset ();
486
487			int len = strlen (name);
488			memcpy (cur, name, len); cur += len;
489			*cur++ = ' ';
490			}
491
492	root	1.23	packet &packet::operator <<(const data &v)
493			{
494			if (room () < v.len)
495			reset ();
496			else
497			{
498			if (v.len)
499			{
500			memcpy (cur, v.ptr, v.len);
501			cur += v.len;
502			}
503			}
504
505			return *this;
506			}
507
508			packet &packet::operator <<(const data8 &v)
509			{
510			unsigned int len = min (v.len, 0x00FF);
511			return *this << uint8 (len) << data (v.ptr, len);
512			}
513
514			packet &packet::operator <<(const data16 &v)
515			{
516			unsigned int len = min (v.len, 0xFFFF);
517			return *this << uint16 (len) << data (v.ptr, len);
518			}
519
520			packet &packet::operator <<(const char *v)
521			{
522			return *this << data (v, strlen (v ? v : 0));
523			}
524
525			void
526			packet::vprintf (const char *format, va_list ap)
527			{
528			int size = room ();
529
530			int len = vsnprintf ((char *)cur, size, format, ap);
531
532			if (len >= size)
533			return reset ();
534
535			cur += len;
536			}
537
538	elmex	1.1	/******************************************************************************
539			*
540			* statistics logging functions.
541			*
542			******************************************************************************/
543
544			#ifdef CS_LOGSTATS
545	root	1.5
546	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
547			* stats
548			*/
549			CS_Stats cst_tot, cst_lst;
550
551			/**
552			* Writes out the gathered stats. We clear cst_lst.
553			*/
554	root	1.5	void
555			write_cs_stats (void)
556	elmex	1.1	{
557	root	1.5	time_t now = time (NULL);
558	elmex	1.1
559	root	1.5	/* If no connections recently, don't both to log anything */
560			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561			return;
562
563			/* CSSTAT is put in so scripts can easily find the line */
564			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
565			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
566			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
567			cst_lst.ibytes = 0;
568			cst_lst.obytes = 0;
569			cst_lst.time_start = now;
570	elmex	1.1	}
571			#endif
572	root	1.9