server/socket/lowlevel.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 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 Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

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

// 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;

  /**
   * 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 && pl && pl->active)
        {
          // this is a bit ugly, but map1a seems to be the only
          // nop'able command and it is quite small.
          packet sl ("map1a");
          send_packet (sl);
        }
      else
        return;
    }

  if (socket_ev.poll () & EV_WRITE)
    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 () | EV_WRITE);
          socket_ev.start ();
          return;
        }
      else
        {
          LOG (llevError, "socket write failed: %s\n", strerror (errno));
          destroy ();
          return;
        }
    }

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

/******************************************************************************
 *
 * 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 | NDI_REPLY);
          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 |

static void
NopCmd (char *, int, client *)
{
  // do nothing
}

/**
 * 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+/Deliantra
  {"mapredraw",   PC(MapRedrawCmd) 0 },
  {"mapinfo",     PC(MapInfoCmd)   0 }, // CF+/Deliantra

  {"reply",       SC(ReplyCmd)     0 },
  {"exti",        SC(ExtiCmd)      0 }, // CF+/Deliantra
  {"addme",       SC(AddMeCmd)     0 },
  {"askface",     SC(AskFaceCmd)   0 },
  {"requestinfo", SC(RequestInfo)  0 },
  {"setsound",    SC(SetSound)     0 },
  {"setup",       SC(SetUp)        0 },
  {"version",     SC(VersionCmd)   0 },

  {"toggleextendedtext", SC(NopCmd)   0 }, // deliantra: disabled
};

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 && data [ 3] == ' ' && !strncmp (data, "say "              ,  4)) return true;
  if (len >  5 && data [ 4] == ' ' && !strncmp (data, "chat "             ,  5)) return true;
  if (len >  6 && data [ 5] == ' ' && !strncmp (data, "shout "            ,  6)) return true;
  if (len >  8 && data [ 7] == ' ' && !strncmp (data, "suicide "          ,  8)) return true;
  if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;

  if (len == 7 && !strcmp (data, "suicide")) 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);
          pl->need_updated_stats ();
        }
      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 | NDI_REPLY, 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;
    }

  uint8_t save_byte = inbuf [pkt_len]; // rather ugly
  inbuf [pkt_len] = 0;      /* temporarily 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 + array_length (packets); ++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 | NDI_REPLY, (char *)inbuf + 2);

next_packet:
  inbuf [pkt_len] = save_byte; // rather ugly
  skip_packet (pkt_len);

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

  return true;
}

void
client::inbuf_handle ()
{
  if (!handle_packet ())
    return;

  while (handle_packet ())
    ;

  flush ();
}

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

  if (revents & EV_WRITE)
    {
      write_outputbuffer ();

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

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

      int amount = sizeof (inbuf) - inbuf_len;

      if (!amount)
        {
          // input buffer full
          LOG (llevError, "input buffer overflow.");
          destroy ();
          return;
        }

      if (ws_version)
        {
          if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
            ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);

          int len = read (fd, ws_inbuf + ws_inbuf_len, ws_inbuf_alloc - ws_inbuf_len);

          if (len > 0)
            {
              ws_inbuf_len += len;

              if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
                return;

              int d = 2;
              int o = ws_inbuf [0] & 15;
              int l = ws_inbuf [1] & 127;

              if (l == 126)
                {
                  l = (ws_inbuf [2] << 8) | ws_inbuf [3];
                  d += 2;
                }
              else if (l == 127)
                {
                  if (ws_inbuf_len < 2 + 8)
                    return;

                  // we don't do extra long frames, if a browser wants to send >2**32 bytes,
                  // there are bigger issues to fix.
                  l = (ws_inbuf [6] << 24)
                    | (ws_inbuf [7] << 16)
                    | (ws_inbuf [8] <<  8)
                    |  ws_inbuf [9];
                  d += 8;
                }

              // we only continue if we have a complete frame
              if (ws_inbuf_len < d + 4 + l)
                return;

              switch (o)
                {
                  case  0: o = ws_inbuf_type; break; // continuation
                  case  1: ws_inbuf_type = 1; break; // utf-8
                  case  2: ws_inbuf_type = 2; break; // binary
                }

              if (l > amount)
                {
                  // input buffer full
                  LOG (llevError, "input buffer overflow (ws).");
                  destroy ();
                  return;
                }

              for (int i = 0; i < l; ++i)
                inbuf [inbuf_len + i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];

              // remove frame
              ws_inbuf_len -= d + 4 + l;
              memmove (ws_inbuf, ws_inbuf + d + 4 + l, ws_inbuf_len);

              switch (o)
                {
                  case  1: // utf-8
                    {
                      uint8 *a = inbuf + inbuf_len;
                      uint8 *b = a;
                      uint8 *c = a + l;

                      for (; a < c; ++a, ++b)
                        {
                          *b = *a;

                          if (*a >= 0x80)
                            *b = (a [0] & 0x1f) << 6 | (a [1] & 0x3f), ++a;
                        }

                      l -= a - b;
                    }
                    break;
                  case  2: // binary
                    break;

                  case  9: // ping
                    {
                      // send pong - we assume ping messages are <64k
                      // as we can't handle >10k at the moment anyway.
                      uint8 hdr [] = { 0x8a, 126, l >> 8, l };
                      send (hdr, sizeof (hdr));
                      send (inbuf + inbuf_len, l);
                    }
                    return;

                  case 10: // pong
                    return;

                  case 8: // close
                  default:
                    destroy ();
                    return;
                }
              
              amount = l;
            }
          else
            amount = -1;
        }
      else
        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;
          inbuf_handle ();
        }
    }
}

/*******************************************************************************
 *
 * 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;

  if (ws_version == 8)
    {
      static uint8 buf [MAXSOCKBUF * 2 + 4];

      uint8 *b = buf + 4;
      for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
        {
          if (*a < 0x80)
            *b++ = *a;
          else
            {
              *b++ = 0xc0 | ((*a >> 6) & 0x1f);
              *b++ = 0x80 | ( *a       & 0x3f);
            }
        }

      assert (b - buf < sizeof (buf));

      int l = b - (buf + 4);

      if (l < 126)
        {
          buf [2] = 0x81;
          buf [3] = l;

          send (buf + 2, l + 2);
        }
      else
        {
          buf [0] = 0x81;
          buf [1] = 126;
          buf [2] = l >> 8;
          buf [3] = l;

          send (buf, l + 4);
        }
    }
  else if (ws_version == 13)
    {
      int l = sl.length ();

      if (l < 126)
        {
          uint8 hdr [] = { 0x82, 126, l >> 8, l };
          send (hdr, sizeof (hdr));
        }
      else
        {
          uint8 hdr [] = { 0x82, l };
          send (hdr, sizeof (hdr));
        }

      send (sl.buf_ + sl.hdrlen, l);
    }
  else
    {
      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_msg (int color, const char *type, const char *msg)
{
  if (!msg || !type) // it can happen (for example, missing attack messages cause this)
    {
      LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
      return;
    }

  int len = strlen (msg);

  if (!(color & NDI_VERBATIM)
      && (msg_is_special (msg)
          || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
    cfperl_send_msg (this, color, type, msg);
  else
    send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
}

void
client::send_drawinfo (const char *msg, int flags)
{
  send_msg (flags, "log", 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:	1.88
Committed:	Tue Nov 6 15:11:16 2012 UTC (11 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.87:	+66 -11 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.62	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	root	1.85	*
4	root	1.84	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	root	1.85	*
6	root	1.71	* Deliantra is free software: you can redistribute it and/or modify it under
7			* the terms of the Affero GNU General Public License as published by the
8			* Free Software Foundation, either version 3 of the License, or (at your
9			* option) any later version.
10	root	1.85	*
11	root	1.49	* 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	root	1.85	*
16	root	1.71	* You should have received a copy of the Affero GNU General Public License
17			* and the GNU General Public License along with this program. If not, see
18			* <http://www.gnu.org/licenses/>.
19	root	1.85	*
20	root	1.62	* The authors can be reached via e-mail to <support@deliantra.net>
21	pippijn	1.32	*/
22	root	1.42
23	elmex	1.1	using namespace std;
24
25			#include <global.h>
26			#include <sproto.h>
27	root	1.11	#include <cstdarg>
28	elmex	1.1
29	root	1.45	#if HAVE_TCP_INFO
30	elmex	1.1	# include <sys/types.h>
31			# include <sys/socket.h>
32			# include <netinet/in.h>
33			# include <netinet/tcp.h>
34			#endif
35
36	root	1.43	// force a packet when idle for more than this many seconds,
37			// forcing an ack regularly.
38			#define IDLE_PING 2.
39	elmex	1.1
40	root	1.5	void
41	root	1.22	client::flush ()
42	elmex	1.1	{
43	root	1.29	if (destroyed ())
44			return;
45
46	root	1.20	/**
47			* Writes data to socket.
48			*
49			* When the socket is clear to write, and we have backlogged data, this
50			* is called to write it out.
51			*/
52
53	root	1.43	// write a nop to the socket at least every IDLE_NOP seconds.
54			if (!outputbuffer.len)
55			{
56	root	1.47	if (last_send + IDLE_PING <= NOW && pl && pl->active)
57	root	1.43	{
58	root	1.82	// this is a bit ugly, but map1a seems to be the only
59			// nop'able command and it is quite small.
60	root	1.80	packet sl ("map1a");
61	root	1.43	send_packet (sl);
62			}
63			else
64			return;
65			}
66
67	root	1.63	if (socket_ev.poll () & EV_WRITE)
68	root	1.20	return;
69
70	root	1.43	last_send = NOW;
71	root	1.20	write_outputbuffer ();
72			}
73	elmex	1.1
74	root	1.20	void
75	root	1.22	client::write_outputbuffer ()
76	root	1.20	{
77			while (outputbuffer.len)
78			{
79			int res = write (fd, outputbuffer.data + outputbuffer.start,
80			min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
81	root	1.5
82	root	1.20	if (res > 0)
83			{
84			outputbuffer.start += res;
85			/* wrap back to start of buffer */
86			if (outputbuffer.start == SOCKETBUFSIZE)
87			outputbuffer.start = 0;
88
89			outputbuffer.len -= res;
90			}
91			else if (res == 0)
92			{
93			LOG (llevError, "socket write failed, connection closed.\n");
94	root	1.23	destroy ();
95	root	1.20	return;
96			}
97			else if (errno == EINTR)
98			{
99			// just retry
100			}
101			else if (errno == EAGAIN)
102			{
103			// delay till ready
104	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
105	root	1.20	socket_ev.start ();
106			return;
107			}
108			else
109			{
110			LOG (llevError, "socket write failed: %s\n", strerror (errno));
111	root	1.23	destroy ();
112	root	1.20	return;
113			}
114			}
115
116	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
117	elmex	1.1	}
118
119	root	1.23	/******************************************************************************
120	elmex	1.1	*
121	root	1.23	* Start of read routines.
122	elmex	1.1	*
123	root	1.23	******************************************************************************/
124	elmex	1.1
125	root	1.23	int
126			client::next_packet ()
127	elmex	1.1	{
128	root	1.23	if (inbuf_len >= 2)
129	root	1.11	{
130	root	1.23	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
131
132			if (inbuf_len >= 2 + pkt_len)
133			return 2 + pkt_len;
134
135			if (inbuf_len == sizeof (inbuf))
136	root	1.15	{
137	root	1.53	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
138	root	1.23	destroy ();
139			return -1;
140	root	1.15	}
141	root	1.11	}
142	root	1.9
143	root	1.23	return 0;
144	root	1.11	}
145	root	1.9
146	root	1.23	void
147			client::skip_packet (int len)
148	root	1.11	{
149	root	1.23	inbuf_len -= len;
150			memmove (inbuf, inbuf + len, inbuf_len);
151	elmex	1.1	}
152
153	root	1.23	/*****************************************************************************
154			* Start of command dispatch area.
155			* The commands here are protocol commands.
156			****************************************************************************/
157
158			// SocketCommand, PlayingCommand, should not exist with those ugly casts
159			#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
160			#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
161
162	root	1.76	static void
163			NopCmd (char , int, client )
164			{
165			// do nothing
166			}
167
168	root	1.23	/**
169			* Dispatch table for the server.
170			*/
171			static struct packet_type packets[] = {
172	root	1.33	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
173			{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
174	root	1.23
175			{"examine", PC(ExamineCmd) PF_PLAYING },
176	root	1.39	{"ex", PC(ExCmd) PF_PLAYING },
177	root	1.23	{"apply", PC(ApplyCmd) PF_PLAYING },
178			{"lookat", PC(LookAt) PF_PLAYING },
179			{"lock", PC(LockItem) PF_PLAYING },
180			{"mark", PC(MarkItem) PF_PLAYING },
181			{"move", PC(MoveCmd) PF_PLAYING },
182	root	1.77	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
183	root	1.39	{"mapredraw", PC(MapRedrawCmd) 0 },
184	root	1.77	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
185	root	1.23
186	root	1.28	{"reply", SC(ReplyCmd) 0 },
187	root	1.77	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
188	root	1.26	{"addme", SC(AddMeCmd) 0 },
189	root	1.36	{"askface", SC(AskFaceCmd) 0 },
190	root	1.26	{"requestinfo", SC(RequestInfo) 0 },
191			{"setsound", SC(SetSound) 0 },
192			{"setup", SC(SetUp) 0 },
193			{"version", SC(VersionCmd) 0 },
194	root	1.76
195	root	1.77	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
196	root	1.23	};
197
198			bool
199			client::may_execute (const packet_type *pkt) const
200	elmex	1.1	{
201	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
202	root	1.29	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
203	root	1.11	}
204	root	1.9
205	root	1.88	// HACK: some commands currently should be executed
206	root	1.33	// even when the player is frozen. this hack detects
207			// those commands. it should be folded into may_execute,
208			// but kept seperate to emphasise the hack aspect, i.e.
209			// do it better, then remove.
210			static bool
211			always_immediate (const client ns, const packet_type pkt, const char *data, int len)
212			{
213			if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
214			return false;
215
216			if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
217			return false;
218
219			if (pkt->flags & PF_COMMAND6)
220			{
221			data += 6;
222			len -= 6;
223			}
224
225	root	1.70	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
226			if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
227			if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
228			if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
229			if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
230	root	1.61
231			if (len == 7 && !strcmp (data, "suicide")) return true;
232	root	1.33
233			return false;
234			}
235
236	root	1.23	void
237			client::execute (const packet_type pkt, char data, int datalen)
238	root	1.11	{
239	root	1.33	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
240	root	1.23	{
241			//TODO: only one format
242			if (pkt->flags & PF_PLAYER)
243	root	1.74	{
244			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
245			pl->need_updated_stats ();
246			}
247	root	1.23	else
248			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
249			}
250			else
251	root	1.53	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
252	elmex	1.1	}
253
254	root	1.23	bool
255			client::handle_packet ()
256	root	1.10	{
257	root	1.23	int pkt_len = next_packet ();
258
259			if (!pkt_len)
260			return false;
261			else if (pkt_len < 0)
262			{
263			LOG (llevError, "read error on player %s\n",
264			pl && pl->ob ? &pl->ob->name : "[anonymous]");
265			destroy ();
266			return false;
267			}
268
269	root	1.72	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
270			inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
271	root	1.23
272			/* First, break out beginning word. There are at least
273			* a few commands that do not have any paremeters. If
274			* we get such a command, don't worry about trying
275			* to break it up.
276			*/
277			int datalen;
278			char data = strchr ((char )inbuf + 2, ' ');
279
280			if (data)
281			{
282			*data++ = 0;
283			datalen = pkt_len - (data - (char *)inbuf);
284			}
285			else
286			{
287			data = (char *)inbuf + 2; // better read garbage than segfault
288			datalen = 0;
289			}
290	root	1.15
291	root	1.78	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
292	root	1.23	if (!strcmp ((char *)inbuf + 2, pkt->name))
293			{
294	root	1.33	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
295	root	1.26	queue_command (pkt, data, datalen);
296			else
297	root	1.23	execute (pkt, data, datalen);
298
299			goto next_packet;
300			}
301
302	root	1.26	// If we get here, we didn't find a valid command.
303	root	1.53	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
304	root	1.72
305	root	1.23	next_packet:
306	root	1.72	inbuf [pkt_len] = save_byte; // rather ugly
307	root	1.23	skip_packet (pkt_len);
308	root	1.11
309	root	1.23	// input buffer has space again
310	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_READ);
311	root	1.10
312	root	1.23	return true;
313	root	1.10	}
314
315	root	1.86	void
316			client::inbuf_handle ()
317			{
318			if (!handle_packet ())
319			return;
320
321			while (handle_packet ())
322			;
323
324			flush ();
325			}
326
327	root	1.23	// callback called when socket is either readable or writable
328			void
329	root	1.63	client::socket_cb (iow &w, int revents)
330	root	1.23	{
331			//TODO remove when we have better socket cleanup logic
332	root	1.29	if (destroyed ())
333	root	1.23	{
334			socket_ev.poll (0);
335			return;
336			}
337	elmex	1.1
338	root	1.63	if (revents & EV_WRITE)
339	root	1.5	{
340	root	1.23	write_outputbuffer ();
341
342			if (!outputbuffer.len)
343	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
344	root	1.23	}
345	root	1.12
346	root	1.63	if (revents & EV_READ)
347	root	1.23	{
348			//TODO: rate-limit tcp connection in better ways, important
349	pippijn	1.8
350	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
351
352	root	1.23	if (!amount)
353	root	1.5	{
354	root	1.23	// input buffer full
355	root	1.87	LOG (llevError, "input buffer overflow.");
356			destroy ();
357	root	1.23	return;
358	root	1.3	}
359	elmex	1.1
360	root	1.87	if (ws_version)
361			{
362	root	1.88	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
363	root	1.87	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
364
365			int len = read (fd, ws_inbuf + ws_inbuf_len, ws_inbuf_alloc - ws_inbuf_len);
366
367			if (len > 0)
368			{
369			ws_inbuf_len += len;
370
371			if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
372			return;
373
374			int d = 2;
375			int o = ws_inbuf [0] & 15;
376			int l = ws_inbuf [1] & 127;
377
378			if (l == 126)
379			{
380			l = (ws_inbuf [2] << 8) \| ws_inbuf [3];
381			d += 2;
382			}
383			else if (l == 127)
384			{
385			if (ws_inbuf_len < 2 + 8)
386			return;
387
388			// we don't do extra long frames, if a browser wants to send >2**32 bytes,
389			// there are bigger issues to fix.
390			l = (ws_inbuf [6] << 24)
391			\| (ws_inbuf [7] << 16)
392			\| (ws_inbuf [8] << 8)
393			\| ws_inbuf [9];
394			d += 8;
395			}
396
397			// we only continue if we have a complete frame
398			if (ws_inbuf_len < d + 4 + l)
399			return;
400
401			switch (o)
402			{
403			case 0: o = ws_inbuf_type; break; // continuation
404			case 1: ws_inbuf_type = 1; break; // utf-8
405			case 2: ws_inbuf_type = 2; break; // binary
406			}
407
408			if (l > amount)
409			{
410			// input buffer full
411			LOG (llevError, "input buffer overflow (ws).");
412			destroy ();
413			return;
414			}
415
416			for (int i = 0; i < l; ++i)
417			inbuf [inbuf_len + i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
418
419			// remove frame
420			ws_inbuf_len -= d + 4 + l;
421			memmove (ws_inbuf, ws_inbuf + d + 4 + l, ws_inbuf_len);
422
423			switch (o)
424			{
425			case 1: // utf-8
426	root	1.88	{
427			uint8 *a = inbuf + inbuf_len;
428			uint8 *b = a;
429			uint8 *c = a + l;
430
431			for (; a < c; ++a, ++b)
432			{
433			b = a;
434
435			if (*a >= 0x80)
436			*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
437			}
438
439			l -= a - b;
440			}
441	root	1.87	break;
442			case 2: // binary
443			break;
444
445			case 9: // ping
446			{
447			// send pong - we assume ping messages are <64k
448			// as we can't handle >10k at the moment anyway.
449			uint8 hdr [] = { 0x8a, 126, l >> 8, l };
450			send (hdr, sizeof (hdr));
451			send (inbuf + inbuf_len, l);
452			}
453			return;
454
455			case 10: // pong
456			return;
457
458			case 8: // close
459			default:
460			destroy ();
461			return;
462			}
463	root	1.88
464	root	1.87	amount = l;
465			}
466			else
467			amount = -1;
468			}
469			else
470			amount = read (fd, inbuf + inbuf_len, amount);
471	root	1.12
472			if (!amount)
473	root	1.5	{
474	root	1.23	destroy ();
475			return;
476	root	1.5	}
477	root	1.12	else if (amount < 0)
478	root	1.5	{
479	root	1.12	if (errno != EAGAIN && errno != EINTR)
480	root	1.5	{
481	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
482	root	1.23	destroy ();
483			return;
484	root	1.3	}
485	root	1.12
486	root	1.23	// should not be here, normally
487	root	1.3	}
488	root	1.23	else
489			{
490			inbuf_len += amount;
491	root	1.86	inbuf_handle ();
492	root	1.23	}
493	root	1.5	}
494	root	1.12	}
495
496	elmex	1.1	/*******************************************************************************
497			*
498			* Start of write related routines.
499			*
500			******************************************************************************/
501
502			/**
503			* Adds data to a socket buffer for whatever reason.
504			*
505			* ns is the socket we are adding the data to, buf is the start of the
506			* data, and len is the number of bytes to add.
507			*/
508	root	1.20	void
509	root	1.22	client::send (void *buf_, int len)
510	root	1.20	{
511			char buf = (char )buf_;
512	elmex	1.1
513	root	1.29	if (destroyed () \|\| !buf)
514	root	1.23	return;
515	elmex	1.1
516	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
517	root	1.5	{
518	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
519	root	1.36	// shutdown the socket, this is safer than destroying it immediately
520			// as lots of code in the callchain might still access the map etc.
521			shutdown (fd, SHUT_RDWR);
522	root	1.5	return;
523			}
524
525	root	1.20	int avail, end;
526
527	root	1.5	/* data + end is where we start putting the new data. The last byte
528			* currently in use is actually data + end -1
529			*/
530	root	1.20	end = outputbuffer.start + outputbuffer.len;
531	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
532			if (end >= SOCKETBUFSIZE)
533			end -= SOCKETBUFSIZE;
534	root	1.7
535	root	1.5	avail = SOCKETBUFSIZE - end;
536	elmex	1.1
537	root	1.5	/* We can all fit it behind the current data without wrapping */
538			if (avail >= len)
539	root	1.20	memcpy (outputbuffer.data + end, buf, len);
540	root	1.5	else
541			{
542	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
543			memcpy (outputbuffer.data, buf + avail, len - avail);
544	elmex	1.1	}
545	root	1.7
546	root	1.20	outputbuffer.len += len;
547	elmex	1.1	}
548
549			/**
550			* Takes a string of data, and writes it out to the socket. A very handy
551			* shortcut function.
552			*/
553	root	1.13	void
554	root	1.22	client::send_packet (packet &sl)
555	root	1.13	{
556	root	1.29	if (destroyed ())
557	root	1.19	return;
558
559	root	1.55	if (sl.length () > MAXSOCKBUF)
560	root	1.19	{
561			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
562			/* Almost certainly we've overflowed a buffer, so quit now to make
563			* it easier to debug.
564			*/
565			abort ();
566			}
567
568			if (!sl.length ())
569			return;
570
571	root	1.87	if (ws_version == 8)
572			{
573	root	1.88	static uint8 buf [MAXSOCKBUF * 2 + 4];
574
575			uint8 *b = buf + 4;
576			for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
577			{
578			if (*a < 0x80)
579			b++ = a;
580			else
581			{
582			b++ = 0xc0 \| ((a >> 6) & 0x1f);
583			b++ = 0x80 \| ( a & 0x3f);
584			}
585			}
586
587			assert (b - buf < sizeof (buf));
588
589			int l = b - (buf + 4);
590
591			if (l < 126)
592			{
593			buf [2] = 0x81;
594			buf [3] = l;
595
596			send (buf + 2, l + 2);
597			}
598			else
599			{
600			buf [0] = 0x81;
601			buf [1] = 126;
602			buf [2] = l >> 8;
603			buf [3] = l;
604
605			send (buf, l + 4);
606			}
607	root	1.87	}
608			else if (ws_version == 13)
609			{
610	root	1.88	int l = sl.length ();
611
612			if (l < 126)
613			{
614			uint8 hdr [] = { 0x82, 126, l >> 8, l };
615			send (hdr, sizeof (hdr));
616			}
617			else
618			{
619			uint8 hdr [] = { 0x82, l };
620			send (hdr, sizeof (hdr));
621			}
622
623			send (sl.buf_ + sl.hdrlen, l);
624	root	1.87	}
625			else
626			{
627			assert (sl.hdrlen == 2);
628	root	1.19
629	root	1.87	sl.buf_ [0] = sl.length () >> 8;
630			sl.buf_ [1] = sl.length () ;
631	root	1.19
632	root	1.87	send (sl.buf_, sl.length () + sl.hdrlen);
633			}
634	root	1.13	}
635
636	root	1.5	void
637	root	1.22	client::send_packet (const char *buf, int len)
638	elmex	1.1	{
639	root	1.14	packet sl;
640	elmex	1.1
641	root	1.13	sl << data (buf, len);
642			send_packet (sl);
643	elmex	1.1	}
644
645	root	1.13	void
646	root	1.22	client::send_packet (const char *buf)
647	root	1.13	{
648			send_packet (buf, strlen (buf));
649			}
650	elmex	1.1
651	root	1.23	void
652			client::send_packet_printf (const char *format, ...)
653			{
654			packet sl;
655
656			va_list ap;
657			va_start (ap, format);
658			sl.vprintf (format, ap);
659			va_end (ap);
660
661			send_packet (sl);
662			}
663
664	root	1.40	void
665			client::send_msg (int color, const char type, const char msg)
666			{
667	root	1.58	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
668			{
669			LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
670			return;
671			}
672
673	root	1.59	int len = strlen (msg);
674
675	root	1.66	if (!(color & NDI_VERBATIM)
676			&& (msg_is_special (msg)
677			\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
678	root	1.48	cfperl_send_msg (this, color, type, msg);
679	root	1.69	else
680	root	1.53	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
681	root	1.40	}
682
683	root	1.48	void
684			client::send_drawinfo (const char *msg, int flags)
685			{
686			send_msg (flags, "log", msg);
687			}
688
689	root	1.23	/***********************************************************************
690			*
691			* packet functions/utilities
692			*
693			**********************************************************************/
694
695	root	1.27	packet::packet (const char *name)
696			{
697			reset ();
698
699			int len = strlen (name);
700			memcpy (cur, name, len); cur += len;
701			*cur++ = ' ';
702			}
703
704	root	1.37	packet &packet::operator <<(const ber32 v)
705			{
706	root	1.79	enum { maxlen = 32 / 7 + 1 };
707	root	1.37	uint8 buf[maxlen];
708			uint8 *p = buf + maxlen;
709			uint32 val = v.val;
710
711	root	1.38	*--p = val & 0x7F;
712
713	root	1.37	while (val > 0x7F)
714			{
715	root	1.38	val >>= 7;
716	root	1.37	*--p = (val & 0x7F) \| 0x80;
717			}
718
719			return *this << data (p, buf + maxlen - p);
720			}
721
722	root	1.23	packet &packet::operator <<(const data &v)
723			{
724			if (room () < v.len)
725			reset ();
726			else
727			{
728			if (v.len)
729			{
730			memcpy (cur, v.ptr, v.len);
731			cur += v.len;
732			}
733			}
734
735			return *this;
736			}
737
738			packet &packet::operator <<(const data8 &v)
739			{
740			unsigned int len = min (v.len, 0x00FF);
741			return *this << uint8 (len) << data (v.ptr, len);
742			}
743
744			packet &packet::operator <<(const data16 &v)
745			{
746			unsigned int len = min (v.len, 0xFFFF);
747			return *this << uint16 (len) << data (v.ptr, len);
748			}
749
750			packet &packet::operator <<(const char *v)
751			{
752			return *this << data (v, strlen (v ? v : 0));
753			}
754
755			void
756			packet::vprintf (const char *format, va_list ap)
757			{
758			int size = room ();
759
760			int len = vsnprintf ((char *)cur, size, format, ap);
761
762			if (len >= size)
763			return reset ();
764
765			cur += len;
766			}
767