server/socket/lowlevel.C

/*
 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT 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 Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * The authors can be reached via e-mail to <crossfire@schmorp.de>
 */

using namespace std;

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

#if HAVE_TCP_INFO
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
#endif

// disconnect a socket after this many seconds without an ack
#define SOCKET_TIMEOUT 8.

// force a packet when idle for more than this many seconds,
// forcing an ack regularly.
#define IDLE_PING 2.

void
client::flush ()
{
  if (destroyed ())
    return;

#if HAVE_TCP_INFO
  // check about once per second, spread evenly over all clients
  if (!((pticks + fd) & 7))
    {
      // 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))
        {
          if (tcpi.tcpi_snd_mss)
            mss = tcpi.tcpi_snd_mss;

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

          if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
            {
              send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
              write_outputbuffer ();

              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.
   */

  // write a nop to the socket at least every IDLE_NOP seconds.
  if (!outputbuffer.len)
    {
      if (last_send + IDLE_PING <= NOW)
        {
          // this is a bit ugly, but map1/map1a seem to be the only
          // nop'able commands and they are quite small.
          packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
          send_packet (sl);
        }
      else
        return;
    }

  if (socket_ev.poll () & PE_W)
    return;

  last_send = NOW;
  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;
        }
      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 | PF_COMMAND6 },
  {"command",     PC(PlayerCmd)    PF_PLAYING | PF_COMMAND0 },

  {"examine",     PC(ExamineCmd)   PF_PLAYING },
  {"ex",          PC(ExCmd)        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 },
  {"mapinfo",     PC(MapInfoCmd)   0 }, // CF+

  {"reply",       SC(ReplyCmd)     0 },
  {"exti",        SC(ExtiCmd)      0 }, // CF+
  {"addme",       SC(AddMeCmd)     0 },
  {"askface",     SC(AskFaceCmd)   0 },
  {"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) || state == ST_PLAYING);
}

// HACK: some commands currently should be executed 
// even when the player is frozen. this hack detects
// those commands. it should be folded into may_execute,
// but kept seperate to emphasise the hack aspect, i.e.
// do it better, then remove.
static bool
always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
{
  if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
    return false;

  if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
    return false;

  if (pkt->flags & PF_COMMAND6)
    {
      data += 6;
      len  -= 6;
    }

  if (len > 4 && !strncmp (data, "say " , 4))
    return true;
  if (len > 5 && !strncmp (data, "chat ", 5))
    return true;

  return false;
}

void
client::execute (const packet_type *pkt, char *data, int datalen)
{
  if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
    {
      //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 && !always_immediate (this, pkt, data, datalen))
          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;

          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_;

  if (destroyed () || !buf)
    return;

  if (len + outputbuffer.len > SOCKETBUFSIZE)
    {
      LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
      // shutdown the socket, this is safer than destroying it immediately
      // as lots of code in the callchain might still access the map etc.
      shutdown (fd, SHUT_RDWR);
      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);
}

void
client::send_drawinfo (const char *msg, int flags)
{
  send_packet_printf ("drawinfo %d %s", flags, msg);
}

void
client::send_msg (int color, const char *type, const char *msg)
{
  if (can_msg)
    send_packet_printf ("msg %d %s %s", color, type, msg);
  else if (color < 0)
    return; // client cannot handle this
  else if (strchr (msg, '<') || strchr (msg, '&'))
    {
      //TODO: should escape/modify to old syntax
      send_packet_printf ("drawinfo %d %s", color, msg);
    }
  else
    send_packet_printf ("drawinfo %d %s", color, msg);
}

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

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

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

packet &packet::operator <<(const ber32 v)
{
  enum { maxlen = 32 / 7 + 1};
  uint8 buf[maxlen];
  uint8 *p = buf + maxlen;
  uint32 val = v.val;

  *--p = val & 0x7F;

  while (val > 0x7F)
    {
      val >>= 7;
      *--p = (val & 0x7F) | 0x80;
    }

  return *this << data (p, buf + maxlen - p);
}

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;
}

Revision:	1.46
Committed:	Sun Jun 10 04:44:21 2007 UTC (16 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.45:	+3 -0 lines
Log Message:	update mss, if possible
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.42	* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
3	pippijn	1.32	*
4	root	1.42	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5			* Copyright (©) 1992,2007 Frank Tore Johansen
6			*
7			* Crossfire TRT is free software; you can redistribute it and/or modify it
8			* under the terms of the GNU General Public License as published by the Free
9			* Software Foundation; either version 2 of the License, or (at your option)
10			* any later version.
11			*
12			* This program is distributed in the hope that it will be useful, but
13			* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14			* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15			* for more details.
16			*
17			* You should have received a copy of the GNU General Public License along
18			* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
19			* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	pippijn	1.32	*
21	root	1.42	* The authors can be reached via e-mail to <crossfire@schmorp.de>
22	pippijn	1.32	*/
23	root	1.42
24	elmex	1.1	using namespace std;
25
26			#include <global.h>
27			#include <sproto.h>
28	root	1.11	#include <cstdarg>
29	elmex	1.1
30	root	1.45	#if HAVE_TCP_INFO
31	elmex	1.1	# include <sys/types.h>
32			# include <sys/socket.h>
33			# include <netinet/in.h>
34			# include <netinet/tcp.h>
35			#endif
36
37	root	1.43	// disconnect a socket after this many seconds without an ack
38			#define SOCKET_TIMEOUT 8.
39
40			// force a packet when idle for more than this many seconds,
41			// forcing an ack regularly.
42			#define IDLE_PING 2.
43	elmex	1.1
44	root	1.5	void
45	root	1.22	client::flush ()
46	elmex	1.1	{
47	root	1.29	if (destroyed ())
48			return;
49
50	root	1.45	#if HAVE_TCP_INFO
51	root	1.43	// check about once per second, spread evenly over all clients
52			if (!((pticks + fd) & 7))
53			{
54			// check time of last ack, and, if too old, kill connection
55			struct tcp_info tcpi;
56			socklen_t len = sizeof (tcpi);
57	elmex	1.1
58	root	1.43	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
59			{
60	root	1.46	if (tcpi.tcpi_snd_mss)
61			mss = tcpi.tcpi_snd_mss;
62
63	root	1.43	rtt = tcpi.tcpi_rtt;
64			rttvar = tcpi.tcpi_rttvar;
65	elmex	1.1
66	root	1.43	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
67			{
68			send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69			write_outputbuffer ();
70	root	1.21
71	root	1.43	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
72			(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
73			destroy ();
74			}
75	elmex	1.1	}
76			}
77	root	1.20	#endif
78
79			/**
80			* Writes data to socket.
81			*
82			* When the socket is clear to write, and we have backlogged data, this
83			* is called to write it out.
84			*/
85
86	root	1.43	// write a nop to the socket at least every IDLE_NOP seconds.
87			if (!outputbuffer.len)
88			{
89			if (last_send + IDLE_PING <= NOW)
90			{
91			// this is a bit ugly, but map1/map1a seem to be the only
92			// nop'able commands and they are quite small.
93			packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
94			send_packet (sl);
95			}
96			else
97			return;
98			}
99
100			if (socket_ev.poll () & PE_W)
101	root	1.20	return;
102
103	root	1.43	last_send = NOW;
104	root	1.20	write_outputbuffer ();
105			}
106	elmex	1.1
107	root	1.20	void
108	root	1.22	client::write_outputbuffer ()
109	root	1.20	{
110			while (outputbuffer.len)
111			{
112			int res = write (fd, outputbuffer.data + outputbuffer.start,
113			min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
114	root	1.5
115	root	1.20	if (res > 0)
116			{
117			outputbuffer.start += res;
118			/* wrap back to start of buffer */
119			if (outputbuffer.start == SOCKETBUFSIZE)
120			outputbuffer.start = 0;
121
122			outputbuffer.len -= res;
123			}
124			else if (res == 0)
125			{
126			LOG (llevError, "socket write failed, connection closed.\n");
127	root	1.23	destroy ();
128	root	1.20	return;
129			}
130			else if (errno == EINTR)
131			{
132			// just retry
133			}
134			else if (errno == EAGAIN)
135			{
136			// delay till ready
137			socket_ev.poll (socket_ev.poll () \| PE_W);
138			socket_ev.start ();
139			return;
140			}
141			else
142			{
143			LOG (llevError, "socket write failed: %s\n", strerror (errno));
144	root	1.23	destroy ();
145	root	1.20	return;
146			}
147			}
148
149			socket_ev.poll (socket_ev.poll () & ~PE_W);
150	elmex	1.1	}
151
152	root	1.23	/******************************************************************************
153	elmex	1.1	*
154	root	1.23	* Start of read routines.
155	elmex	1.1	*
156	root	1.23	******************************************************************************/
157	elmex	1.1
158	root	1.23	int
159			client::next_packet ()
160	elmex	1.1	{
161	root	1.23	if (inbuf_len >= 2)
162	root	1.11	{
163	root	1.23	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
164
165			if (inbuf_len >= 2 + pkt_len)
166			return 2 + pkt_len;
167
168			if (inbuf_len == sizeof (inbuf))
169	root	1.15	{
170	root	1.23	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
171			destroy ();
172			return -1;
173	root	1.15	}
174	root	1.11	}
175	root	1.9
176	root	1.23	return 0;
177	root	1.11	}
178	root	1.9
179	root	1.23	void
180			client::skip_packet (int len)
181	root	1.11	{
182	root	1.23	inbuf_len -= len;
183			memmove (inbuf, inbuf + len, inbuf_len);
184	elmex	1.1	}
185
186	root	1.23	/*****************************************************************************
187			* Start of command dispatch area.
188			* The commands here are protocol commands.
189			****************************************************************************/
190
191			// SocketCommand, PlayingCommand, should not exist with those ugly casts
192			#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
193			#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
194
195			/**
196			* Dispatch table for the server.
197			*/
198			static struct packet_type packets[] = {
199	root	1.33	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
200			{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
201	root	1.23
202			{"examine", PC(ExamineCmd) PF_PLAYING },
203	root	1.39	{"ex", PC(ExCmd) PF_PLAYING },
204	root	1.23	{"apply", PC(ApplyCmd) PF_PLAYING },
205			{"lookat", PC(LookAt) PF_PLAYING },
206			{"lock", PC(LockItem) PF_PLAYING },
207			{"mark", PC(MarkItem) PF_PLAYING },
208			{"move", PC(MoveCmd) PF_PLAYING },
209	root	1.39	{"ext", PC(ExtCmd) 0 }, // CF+
210			{"mapredraw", PC(MapRedrawCmd) 0 },
211			{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
212	root	1.23
213	root	1.28	{"reply", SC(ReplyCmd) 0 },
214	root	1.39	{"exti", SC(ExtiCmd) 0 }, // CF+
215	root	1.26	{"addme", SC(AddMeCmd) 0 },
216	root	1.36	{"askface", SC(AskFaceCmd) 0 },
217	root	1.26	{"requestinfo", SC(RequestInfo) 0 },
218			{"setfacemode", SC(SetFaceMode) 0 },
219			{"setsound", SC(SetSound) 0 },
220			{"setup", SC(SetUp) 0 },
221			{"version", SC(VersionCmd) 0 },
222			{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
223			{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
224			{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
225	root	1.23	};
226
227			bool
228			client::may_execute (const packet_type *pkt) const
229	elmex	1.1	{
230	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
231	root	1.29	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
232	root	1.11	}
233	root	1.9
234	root	1.33	// HACK: some commands currently should be executed
235			// even when the player is frozen. this hack detects
236			// those commands. it should be folded into may_execute,
237			// but kept seperate to emphasise the hack aspect, i.e.
238			// do it better, then remove.
239			static bool
240			always_immediate (const client ns, const packet_type pkt, const char *data, int len)
241			{
242			if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
243			return false;
244
245			if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
246			return false;
247
248			if (pkt->flags & PF_COMMAND6)
249			{
250			data += 6;
251			len -= 6;
252			}
253
254			if (len > 4 && !strncmp (data, "say " , 4))
255			return true;
256			if (len > 5 && !strncmp (data, "chat ", 5))
257			return true;
258
259			return false;
260			}
261
262	root	1.23	void
263			client::execute (const packet_type pkt, char data, int datalen)
264	root	1.11	{
265	root	1.33	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
266	root	1.23	{
267			//TODO: only one format
268			if (pkt->flags & PF_PLAYER)
269			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
270			else
271			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
272			}
273			else
274			send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
275	elmex	1.1	}
276
277	root	1.23	bool
278			client::handle_packet ()
279	root	1.10	{
280	root	1.23	int pkt_len = next_packet ();
281
282			if (!pkt_len)
283			return false;
284			else if (pkt_len < 0)
285			{
286			LOG (llevError, "read error on player %s\n",
287			pl && pl->ob ? &pl->ob->name : "[anonymous]");
288			destroy ();
289			return false;
290			}
291
292			inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
293
294			/* First, break out beginning word. There are at least
295			* a few commands that do not have any paremeters. If
296			* we get such a command, don't worry about trying
297			* to break it up.
298			*/
299			int datalen;
300			char data = strchr ((char )inbuf + 2, ' ');
301
302			if (data)
303			{
304			*data++ = 0;
305			datalen = pkt_len - (data - (char *)inbuf);
306			}
307			else
308			{
309			data = (char *)inbuf + 2; // better read garbage than segfault
310			datalen = 0;
311			}
312	root	1.15
313	root	1.23	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
314			if (!strcmp ((char *)inbuf + 2, pkt->name))
315			{
316	root	1.33	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
317	root	1.26	queue_command (pkt, data, datalen);
318			else
319	root	1.23	execute (pkt, data, datalen);
320
321			goto next_packet;
322			}
323
324	root	1.26	// If we get here, we didn't find a valid command.
325	root	1.23	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
326			next_packet:
327			skip_packet (pkt_len);
328	root	1.11
329	root	1.23	// input buffer has space again
330			socket_ev.poll (socket_ev.poll () \| PE_R);
331	root	1.10
332	root	1.23	return true;
333	root	1.10	}
334
335	root	1.23	// callback called when socket is either readable or writable
336			void
337			client::socket_cb (iow &w, int got)
338			{
339			//TODO remove when we have better socket cleanup logic
340	root	1.29	if (destroyed ())
341	root	1.23	{
342			socket_ev.poll (0);
343			return;
344			}
345	elmex	1.1
346	root	1.23	if (got & PE_W)
347	root	1.5	{
348	root	1.23	write_outputbuffer ();
349
350			if (!outputbuffer.len)
351			socket_ev.poll (socket_ev.poll () & ~PE_W);
352			}
353	root	1.12
354	root	1.23	if (got & PE_R)
355			{
356			//TODO: rate-limit tcp connection in better ways, important
357	pippijn	1.8
358	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
359
360	root	1.23	if (!amount)
361	root	1.5	{
362	root	1.23	// input buffer full
363			socket_ev.poll (socket_ev.poll () & ~PE_R);
364			return;
365	root	1.3	}
366	elmex	1.1
367	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
368
369			if (!amount)
370	root	1.5	{
371	root	1.23	destroy ();
372			return;
373	root	1.5	}
374	root	1.12	else if (amount < 0)
375	root	1.5	{
376	root	1.12	if (errno != EAGAIN && errno != EINTR)
377	root	1.5	{
378	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
379	root	1.23	destroy ();
380			return;
381	root	1.3	}
382	root	1.12
383	root	1.23	// should not be here, normally
384	root	1.3	}
385	root	1.23	else
386			{
387			inbuf_len += amount;
388	root	1.12
389	root	1.23	cmd_ev.start ();
390			}
391	root	1.5	}
392	root	1.12	}
393
394	root	1.23	// called whenever we have additional commands to process
395	root	1.12	void
396	root	1.23	client::cmd_cb (iw &w)
397	root	1.12	{
398	root	1.26	if (handle_packet ())
399	root	1.23	w.start ();
400			else
401			flush ();
402	elmex	1.1	}
403
404			/*******************************************************************************
405			*
406			* Start of write related routines.
407			*
408			******************************************************************************/
409
410			/**
411			* Adds data to a socket buffer for whatever reason.
412			*
413			* ns is the socket we are adding the data to, buf is the start of the
414			* data, and len is the number of bytes to add.
415			*/
416	root	1.20	void
417	root	1.22	client::send (void *buf_, int len)
418	root	1.20	{
419			char buf = (char )buf_;
420	elmex	1.1
421	root	1.29	if (destroyed () \|\| !buf)
422	root	1.23	return;
423	elmex	1.1
424	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
425	root	1.5	{
426	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
427	root	1.36	// shutdown the socket, this is safer than destroying it immediately
428			// as lots of code in the callchain might still access the map etc.
429			shutdown (fd, SHUT_RDWR);
430	root	1.5	return;
431			}
432
433	root	1.20	int avail, end;
434
435	root	1.5	/* data + end is where we start putting the new data. The last byte
436			* currently in use is actually data + end -1
437			*/
438	root	1.20	end = outputbuffer.start + outputbuffer.len;
439	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
440			if (end >= SOCKETBUFSIZE)
441			end -= SOCKETBUFSIZE;
442	root	1.7
443	root	1.5	avail = SOCKETBUFSIZE - end;
444	elmex	1.1
445	root	1.5	/* We can all fit it behind the current data without wrapping */
446			if (avail >= len)
447	root	1.20	memcpy (outputbuffer.data + end, buf, len);
448	root	1.5	else
449			{
450	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
451			memcpy (outputbuffer.data, buf + avail, len - avail);
452	elmex	1.1	}
453	root	1.7
454	root	1.20	outputbuffer.len += len;
455	elmex	1.1	}
456
457			/**
458			* Takes a string of data, and writes it out to the socket. A very handy
459			* shortcut function.
460			*/
461	root	1.13	void
462	root	1.22	client::send_packet (packet &sl)
463	root	1.13	{
464	root	1.29	if (destroyed ())
465	root	1.19	return;
466
467			if (sl.length () >= MAXSOCKBUF)
468			{
469			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
470			/* Almost certainly we've overflowed a buffer, so quit now to make
471			* it easier to debug.
472			*/
473			abort ();
474			}
475
476			if (!sl.length ())
477			return;
478
479			assert (sl.hdrlen == 2);
480
481			sl.buf_ [0] = sl.length () >> 8;
482			sl.buf_ [1] = sl.length () ;
483
484			send (sl.buf_, sl.length () + sl.hdrlen);
485	root	1.13	}
486
487	root	1.5	void
488	root	1.22	client::send_packet (const char *buf, int len)
489	elmex	1.1	{
490	root	1.14	packet sl;
491	elmex	1.1
492	root	1.13	sl << data (buf, len);
493			send_packet (sl);
494	elmex	1.1	}
495
496	root	1.13	void
497	root	1.22	client::send_packet (const char *buf)
498	root	1.13	{
499			send_packet (buf, strlen (buf));
500			}
501	elmex	1.1
502	root	1.23	void
503			client::send_packet_printf (const char *format, ...)
504			{
505			packet sl;
506
507			va_list ap;
508			va_start (ap, format);
509			sl.vprintf (format, ap);
510			va_end (ap);
511
512			send_packet (sl);
513			}
514
515	root	1.35	void
516			client::send_drawinfo (const char *msg, int flags)
517			{
518			send_packet_printf ("drawinfo %d %s", flags, msg);
519			}
520
521	root	1.40	void
522			client::send_msg (int color, const char type, const char msg)
523			{
524			if (can_msg)
525			send_packet_printf ("msg %d %s %s", color, type, msg);
526			else if (color < 0)
527			return; // client cannot handle this
528			else if (strchr (msg, '<') \|\| strchr (msg, '&'))
529			{
530			//TODO: should escape/modify to old syntax
531			send_packet_printf ("drawinfo %d %s", color, msg);
532			}
533			else
534			send_packet_printf ("drawinfo %d %s", color, msg);
535			}
536
537	root	1.23	/***********************************************************************
538			*
539			* packet functions/utilities
540			*
541			**********************************************************************/
542
543	root	1.27	packet::packet (const char *name)
544			{
545			reset ();
546
547			int len = strlen (name);
548			memcpy (cur, name, len); cur += len;
549			*cur++ = ' ';
550			}
551
552	root	1.37	packet &packet::operator <<(const ber32 v)
553			{
554			enum { maxlen = 32 / 7 + 1};
555			uint8 buf[maxlen];
556			uint8 *p = buf + maxlen;
557			uint32 val = v.val;
558
559	root	1.38	*--p = val & 0x7F;
560
561	root	1.37	while (val > 0x7F)
562			{
563	root	1.38	val >>= 7;
564	root	1.37	*--p = (val & 0x7F) \| 0x80;
565			}
566
567			return *this << data (p, buf + maxlen - p);
568			}
569
570	root	1.23	packet &packet::operator <<(const data &v)
571			{
572			if (room () < v.len)
573			reset ();
574			else
575			{
576			if (v.len)
577			{
578			memcpy (cur, v.ptr, v.len);
579			cur += v.len;
580			}
581			}
582
583			return *this;
584			}
585
586			packet &packet::operator <<(const data8 &v)
587			{
588			unsigned int len = min (v.len, 0x00FF);
589			return *this << uint8 (len) << data (v.ptr, len);
590			}
591
592			packet &packet::operator <<(const data16 &v)
593			{
594			unsigned int len = min (v.len, 0xFFFF);
595			return *this << uint16 (len) << data (v.ptr, len);
596			}
597
598			packet &packet::operator <<(const char *v)
599			{
600			return *this << data (v, strlen (v ? v : 0));
601			}
602
603			void
604			packet::vprintf (const char *format, va_list ap)
605			{
606			int size = room ();
607
608			int len = vsnprintf ((char *)cur, size, format, ap);
609
610			if (len >= size)
611			return reset ();
612
613			cur += len;
614			}
615