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 *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	*
6	* 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	*
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 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	*
20	* The authors can be reached via e-mail to <support@deliantra.net>
21	*/
22
23	using namespace std;
24
25	#include <global.h>
26	#include <sproto.h>
27	#include <cstdarg>
28
29	#if HAVE_TCP_INFO
30	# include <sys/types.h>
31	# include <sys/socket.h>
32	# include <netinet/in.h>
33	# include <netinet/tcp.h>
34	#endif
35
36	// force a packet when idle for more than this many seconds,
37	// forcing an ack regularly.
38	#define IDLE_PING 2.
39
40	void
41	client::flush ()
42	{
43	if (destroyed ())
44	return;
45
46	/**
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	// write a nop to the socket at least every IDLE_NOP seconds.
54	if (!outputbuffer.len)
55	{
56	if (last_send + IDLE_PING <= NOW && pl && pl->active)
57	{
58	// this is a bit ugly, but map1a seems to be the only
59	// nop'able command and it is quite small.
60	packet sl ("map1a");
61	send_packet (sl);
62	}
63	else
64	return;
65	}
66
67	if (socket_ev.poll () & EV_WRITE)
68	return;
69
70	last_send = NOW;
71	write_outputbuffer ();
72	}
73
74	void
75	client::write_outputbuffer ()
76	{
77	while (outputbuffer.len)
78	{
79	int res = write (fd, outputbuffer.data + outputbuffer.start,
80	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
81
82	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	destroy ();
95	return;
96	}
97	else if (errno == EINTR)
98	{
99	// just retry
100	}
101	else if (errno == EAGAIN)
102	{
103	// delay till ready
104	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
105	socket_ev.start ();
106	return;
107	}
108	else
109	{
110	LOG (llevError, "socket write failed: %s\n", strerror (errno));
111	destroy ();
112	return;
113	}
114	}
115
116	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
117	}
118
119	/******************************************************************************
120	*
121	* Start of read routines.
122	*
123	******************************************************************************/
124
125	int
126	client::next_packet ()
127	{
128	if (inbuf_len >= 2)
129	{
130	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	{
137	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
138	destroy ();
139	return -1;
140	}
141	}
142
143	return 0;
144	}
145
146	void
147	client::skip_packet (int len)
148	{
149	inbuf_len -= len;
150	memmove (inbuf, inbuf + len, inbuf_len);
151	}
152
153	/*****************************************************************************
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	static void
163	NopCmd (char , int, client )
164	{
165	// do nothing
166	}
167
168	/**
169	* Dispatch table for the server.
170	*/
171	static struct packet_type packets[] = {
172	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
174
175	{"examine", PC(ExamineCmd) PF_PLAYING },
176	{"ex", PC(ExCmd) PF_PLAYING },
177	{"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	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
183	{"mapredraw", PC(MapRedrawCmd) 0 },
184	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
185
186	{"reply", SC(ReplyCmd) 0 },
187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
188	{"addme", SC(AddMeCmd) 0 },
189	{"askface", SC(AskFaceCmd) 0 },
190	{"requestinfo", SC(RequestInfo) 0 },
191	{"setsound", SC(SetSound) 0 },
192	{"setup", SC(SetUp) 0 },
193	{"version", SC(VersionCmd) 0 },
194
195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
196	};
197
198	bool
199	client::may_execute (const packet_type *pkt) const
200	{
201	return (!(pkt->flags & PF_PLAYER) \|\| pl)
202	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
203	}
204
205	// HACK: some commands currently should be executed
206	// 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	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
231	if (len == 7 && !strcmp (data, "suicide")) return true;
232
233	return false;
234	}
235
236	void
237	client::execute (const packet_type pkt, char data, int datalen)
238	{
239	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
240	{
241	//TODO: only one format
242	if (pkt->flags & PF_PLAYER)
243	{
244	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
245	pl->need_updated_stats ();
246	}
247	else
248	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
249	}
250	else
251	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
252	}
253
254	bool
255	client::handle_packet ()
256	{
257	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	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
270	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
271
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
291	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
292	if (!strcmp ((char *)inbuf + 2, pkt->name))
293	{
294	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
295	queue_command (pkt, data, datalen);
296	else
297	execute (pkt, data, datalen);
298
299	goto next_packet;
300	}
301
302	// If we get here, we didn't find a valid command.
303	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
304
305	next_packet:
306	inbuf [pkt_len] = save_byte; // rather ugly
307	skip_packet (pkt_len);
308
309	// input buffer has space again
310	socket_ev.poll (socket_ev.poll () \| EV_READ);
311
312	return true;
313	}
314
315	void
316	client::inbuf_handle ()
317	{
318	if (!handle_packet ())
319	return;
320
321	while (handle_packet ())
322	;
323
324	flush ();
325	}
326
327	// callback called when socket is either readable or writable
328	void
329	client::socket_cb (iow &w, int revents)
330	{
331	//TODO remove when we have better socket cleanup logic
332	if (destroyed ())
333	{
334	socket_ev.poll (0);
335	return;
336	}
337
338	if (revents & EV_WRITE)
339	{
340	write_outputbuffer ();
341
342	if (!outputbuffer.len)
343	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
344	}
345
346	if (revents & EV_READ)
347	{
348	//TODO: rate-limit tcp connection in better ways, important
349
350	int amount = sizeof (inbuf) - inbuf_len;
351
352	if (!amount)
353	{
354	// input buffer full
355	LOG (llevError, "input buffer overflow.");
356	destroy ();
357	return;
358	}
359
360	if (ws_version)
361	{
362	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
363	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	{
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	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
464	amount = l;
465	}
466	else
467	amount = -1;
468	}
469	else
470	amount = read (fd, inbuf + inbuf_len, amount);
471
472	if (!amount)
473	{
474	destroy ();
475	return;
476	}
477	else if (amount < 0)
478	{
479	if (errno != EAGAIN && errno != EINTR)
480	{
481	LOG (llevError, "read error: %s\n", strerror (errno));
482	destroy ();
483	return;
484	}
485
486	// should not be here, normally
487	}
488	else
489	{
490	inbuf_len += amount;
491	inbuf_handle ();
492	}
493	}
494	}
495
496	/*******************************************************************************
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	void
509	client::send (void *buf_, int len)
510	{
511	char buf = (char )buf_;
512
513	if (destroyed () \|\| !buf)
514	return;
515
516	if (len + outputbuffer.len > SOCKETBUFSIZE)
517	{
518	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
519	// 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	return;
523	}
524
525	int avail, end;
526
527	/* data + end is where we start putting the new data. The last byte
528	* currently in use is actually data + end -1
529	*/
530	end = outputbuffer.start + outputbuffer.len;
531	/* The buffer is already in a wrapped state, so adjust end */
532	if (end >= SOCKETBUFSIZE)
533	end -= SOCKETBUFSIZE;
534
535	avail = SOCKETBUFSIZE - end;
536
537	/* We can all fit it behind the current data without wrapping */
538	if (avail >= len)
539	memcpy (outputbuffer.data + end, buf, len);
540	else
541	{
542	memcpy (outputbuffer.data + end, buf, avail);
543	memcpy (outputbuffer.data, buf + avail, len - avail);
544	}
545
546	outputbuffer.len += len;
547	}
548
549	/**
550	* Takes a string of data, and writes it out to the socket. A very handy
551	* shortcut function.
552	*/
553	void
554	client::send_packet (packet &sl)
555	{
556	if (destroyed ())
557	return;
558
559	if (sl.length () > MAXSOCKBUF)
560	{
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	if (ws_version == 8)
572	{
573	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	}
608	else if (ws_version == 13)
609	{
610	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	}
625	else
626	{
627	assert (sl.hdrlen == 2);
628
629	sl.buf_ [0] = sl.length () >> 8;
630	sl.buf_ [1] = sl.length () ;
631
632	send (sl.buf_, sl.length () + sl.hdrlen);
633	}
634	}
635
636	void
637	client::send_packet (const char *buf, int len)
638	{
639	packet sl;
640
641	sl << data (buf, len);
642	send_packet (sl);
643	}
644
645	void
646	client::send_packet (const char *buf)
647	{
648	send_packet (buf, strlen (buf));
649	}
650
651	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	void
665	client::send_msg (int color, const char type, const char msg)
666	{
667	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	int len = strlen (msg);
674
675	if (!(color & NDI_VERBATIM)
676	&& (msg_is_special (msg)
677	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
678	cfperl_send_msg (this, color, type, msg);
679	else
680	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
681	}
682
683	void
684	client::send_drawinfo (const char *msg, int flags)
685	{
686	send_msg (flags, "log", msg);
687	}
688
689	/***********************************************************************
690	*
691	* packet functions/utilities
692	*
693	**********************************************************************/
694
695	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	packet &packet::operator <<(const ber32 v)
705	{
706	enum { maxlen = 32 / 7 + 1 };
707	uint8 buf[maxlen];
708	uint8 *p = buf + maxlen;
709	uint32 val = v.val;
710
711	*--p = val & 0x7F;
712
713	while (val > 0x7F)
714	{
715	val >>= 7;
716	*--p = (val & 0x7F) \| 0x80;
717	}
718
719	return *this << data (p, buf + maxlen - p);
720	}
721
722	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