server/socket/lowlevel.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2018 Marc Alexander Lehmann / the Deliantra team
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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_PING 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 ("msg %d log 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[] = {
  {"command",     PC(PlayerCmd)    PF_PLAYING | PF_COMMAND },

  {"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_COMMAND))
    return false;

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

  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 ("msg %d log 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 + ecb_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 ("msg %d log 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)
    {
      int amount;
      uint8 *rbuf;

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

          rbuf = ws_inbuf + ws_inbuf_len;
          amount = ws_inbuf_alloc - ws_inbuf_len;
        }
      else
        {
          rbuf = inbuf + inbuf_len;
          amount = sizeof (inbuf) - inbuf_len;
        }

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

      amount = read (fd, rbuf, 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
        }

      if (ws_version)
        {
          ws_inbuf_len += amount;

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

              int d   = 2;
              int fin = ws_inbuf [0] & 0x80;
              int op  = ws_inbuf [0] & 0x0f;
              int len = ws_inbuf [1] & 0x7f;

              if (len == 126)
                {
                  len = (ws_inbuf [2] << 8) | ws_inbuf [3];
                  d += 2;
                }
              else if (len == 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.
                  len = (ws_inbuf [8] << 8) |  ws_inbuf [9];
                  d += 8;
                }

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

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

              if (len > sizeof (inbuf) - inbuf_len)
                {
                  // input buffer full
                  LOG (llevError, "input buffer overflow (ws).");
                  destroy ();
                  return;
                }

              uint8 *buf = inbuf + inbuf_len + 2;

              for (int i = 0; i < len; ++i)
                buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];

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

              switch (op)
                {
                  case  1: // utf-8
                    // utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
                    // but we assume that these extra-long packets will be rare.
                    {
                      uint8 *a = buf;
                      uint8 *b = a;
                      uint8 *c = a + len;

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

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

                      len -= a - b;
                    }
                    /* FALLTHROUGH */
                  case  2: // binary
                    inbuf_len += len;

                    if (fin)
                      {
                        inbuf [0] = inbuf_len >> 8;
                        inbuf [1] = inbuf_len;

                        inbuf_len += 2;

                        inbuf_handle ();
                      }
                    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, len >> 8, len };
                      send (hdr, sizeof (hdr));
                      send (inbuf + inbuf_len, len);
                    }
                    break;

                  case 10: // pong
                    break;

                  case 8: // close
                  default:
                    destroy ();
                    return;
                }
            }
        }
      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 len = b - (buf + 4);

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

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

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

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

      send (sl.buf_ + sl.hdrlen, len);
    }
  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_n (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);
}

/***********************************************************************
 *
 * 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_n (p, buf + maxlen - p);
}

packet &packet::operator <<(const data_n &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_n (v.ptr, len);
}

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

packet &packet::operator <<(const char *v)
{
  return *this << data_n (v, v ? strlen (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:	1.101
Committed:	Sat Dec 1 20:22:13 2018 UTC (5 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.100:	+1 -1 lines
Log Message:	slight cleanup
#	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	1.100	* Copyright (©) 2018 Marc Alexander Lehmann / the Deliantra team
5	root	1.98	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
6	root	1.85	*
7	root	1.71	* Deliantra is free software: you can redistribute it and/or modify it under
8			* the terms of the Affero GNU General Public License as published by the
9			* Free Software Foundation, either version 3 of the License, or (at your
10			* option) any later version.
11	root	1.85	*
12	root	1.49	* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16	root	1.85	*
17	root	1.71	* You should have received a copy of the Affero GNU General Public License
18			* and the GNU General Public License along with this program. If not, see
19			* <http://www.gnu.org/licenses/>.
20	root	1.85	*
21	root	1.62	* The authors can be reached via e-mail to <support@deliantra.net>
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	// force a packet when idle for more than this many seconds,
38			// forcing an ack regularly.
39			#define IDLE_PING 2.
40	elmex	1.1
41	root	1.5	void
42	root	1.22	client::flush ()
43	elmex	1.1	{
44	root	1.29	if (destroyed ())
45			return;
46
47	root	1.20	/**
48			* Writes data to socket.
49			*
50			* When the socket is clear to write, and we have backlogged data, this
51			* is called to write it out.
52			*/
53
54	root	1.90	// write a nop to the socket at least every IDLE_PING seconds.
55	root	1.43	if (!outputbuffer.len)
56			{
57	root	1.47	if (last_send + IDLE_PING <= NOW && pl && pl->active)
58	root	1.43	{
59	root	1.82	// this is a bit ugly, but map1a seems to be the only
60			// nop'able command and it is quite small.
61	root	1.80	packet sl ("map1a");
62	root	1.43	send_packet (sl);
63			}
64			else
65			return;
66			}
67
68	root	1.63	if (socket_ev.poll () & EV_WRITE)
69	root	1.20	return;
70
71	root	1.43	last_send = NOW;
72	root	1.20	write_outputbuffer ();
73			}
74	elmex	1.1
75	root	1.20	void
76	root	1.22	client::write_outputbuffer ()
77	root	1.20	{
78			while (outputbuffer.len)
79			{
80			int res = write (fd, outputbuffer.data + outputbuffer.start,
81			min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
82	root	1.5
83	root	1.20	if (res > 0)
84			{
85			outputbuffer.start += res;
86			/* wrap back to start of buffer */
87			if (outputbuffer.start == SOCKETBUFSIZE)
88			outputbuffer.start = 0;
89
90			outputbuffer.len -= res;
91			}
92			else if (res == 0)
93			{
94			LOG (llevError, "socket write failed, connection closed.\n");
95	root	1.23	destroy ();
96	root	1.20	return;
97			}
98			else if (errno == EINTR)
99			{
100			// just retry
101			}
102			else if (errno == EAGAIN)
103			{
104			// delay till ready
105	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
106	root	1.20	socket_ev.start ();
107			return;
108			}
109			else
110			{
111			LOG (llevError, "socket write failed: %s\n", strerror (errno));
112	root	1.23	destroy ();
113	root	1.20	return;
114			}
115			}
116
117	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
118	elmex	1.1	}
119
120	root	1.23	/******************************************************************************
121	elmex	1.1	*
122	root	1.23	* Start of read routines.
123	elmex	1.1	*
124	root	1.23	******************************************************************************/
125	elmex	1.1
126	root	1.23	int
127			client::next_packet ()
128	elmex	1.1	{
129	root	1.23	if (inbuf_len >= 2)
130	root	1.11	{
131	root	1.23	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
132
133			if (inbuf_len >= 2 + pkt_len)
134			return 2 + pkt_len;
135
136			if (inbuf_len == sizeof (inbuf))
137	root	1.15	{
138	root	1.94	send_packet_printf ("msg %d log input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
139	root	1.23	destroy ();
140			return -1;
141	root	1.15	}
142	root	1.11	}
143	root	1.9
144	root	1.23	return 0;
145	root	1.11	}
146	root	1.9
147	root	1.23	void
148			client::skip_packet (int len)
149	root	1.11	{
150	root	1.23	inbuf_len -= len;
151			memmove (inbuf, inbuf + len, inbuf_len);
152	elmex	1.1	}
153
154	root	1.23	/*****************************************************************************
155			* Start of command dispatch area.
156	root	1.99	* The commands here are protocol commands.
157	root	1.23	****************************************************************************/
158
159			// SocketCommand, PlayingCommand, should not exist with those ugly casts
160			#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
161			#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
162
163	root	1.76	static void
164			NopCmd (char , int, client )
165			{
166			// do nothing
167			}
168
169	root	1.23	/**
170			* Dispatch table for the server.
171			*/
172			static struct packet_type packets[] = {
173	root	1.92	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND },
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	root	1.92	if (!(pkt->flags & PF_COMMAND))
214	root	1.33	return false;
215
216			if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
217			return false;
218
219	root	1.70	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
220			if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
221			if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
222			if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
223			if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
224	root	1.61
225			if (len == 7 && !strcmp (data, "suicide")) return true;
226	root	1.33
227			return false;
228			}
229
230	root	1.23	void
231			client::execute (const packet_type pkt, char data, int datalen)
232	root	1.11	{
233	root	1.33	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
234	root	1.23	{
235			//TODO: only one format
236			if (pkt->flags & PF_PLAYER)
237	root	1.74	{
238			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
239			pl->need_updated_stats ();
240			}
241	root	1.23	else
242			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
243			}
244			else
245	root	1.97	send_packet_printf ("msg %d log ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
246	elmex	1.1	}
247
248	root	1.23	bool
249			client::handle_packet ()
250	root	1.10	{
251	root	1.23	int pkt_len = next_packet ();
252
253			if (!pkt_len)
254			return false;
255			else if (pkt_len < 0)
256			{
257			LOG (llevError, "read error on player %s\n",
258			pl && pl->ob ? &pl->ob->name : "[anonymous]");
259			destroy ();
260			return false;
261			}
262
263	root	1.72	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
264			inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
265	root	1.23
266			/* First, break out beginning word. There are at least
267			* a few commands that do not have any paremeters. If
268			* we get such a command, don't worry about trying
269			* to break it up.
270			*/
271			int datalen;
272			char data = strchr ((char )inbuf + 2, ' ');
273
274			if (data)
275			{
276			*data++ = 0;
277			datalen = pkt_len - (data - (char *)inbuf);
278			}
279			else
280			{
281			data = (char *)inbuf + 2; // better read garbage than segfault
282			datalen = 0;
283			}
284	root	1.15
285	root	1.101	for (packet_type *pkt = packets; pkt < packets + ecb_array_length (packets); ++pkt)
286	root	1.23	if (!strcmp ((char *)inbuf + 2, pkt->name))
287			{
288	root	1.33	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
289	root	1.26	queue_command (pkt, data, datalen);
290			else
291	root	1.23	execute (pkt, data, datalen);
292
293			goto next_packet;
294			}
295
296	root	1.26	// If we get here, we didn't find a valid command.
297	root	1.94	send_packet_printf ("msg %d log ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
298	root	1.72
299	root	1.23	next_packet:
300	root	1.72	inbuf [pkt_len] = save_byte; // rather ugly
301	root	1.23	skip_packet (pkt_len);
302	root	1.11
303	root	1.23	// input buffer has space again
304	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_READ);
305	root	1.10
306	root	1.23	return true;
307	root	1.10	}
308
309	root	1.86	void
310			client::inbuf_handle ()
311			{
312			if (!handle_packet ())
313			return;
314
315			while (handle_packet ())
316			;
317
318			flush ();
319			}
320
321	root	1.23	// callback called when socket is either readable or writable
322			void
323	root	1.63	client::socket_cb (iow &w, int revents)
324	root	1.23	{
325			//TODO remove when we have better socket cleanup logic
326	root	1.29	if (destroyed ())
327	root	1.23	{
328			socket_ev.poll (0);
329			return;
330			}
331	elmex	1.1
332	root	1.63	if (revents & EV_WRITE)
333	root	1.5	{
334	root	1.23	write_outputbuffer ();
335
336			if (!outputbuffer.len)
337	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
338	root	1.23	}
339	root	1.12
340	root	1.63	if (revents & EV_READ)
341	root	1.23	{
342	root	1.90	int amount;
343			uint8 *rbuf;
344	pippijn	1.8
345	root	1.90	if (ws_version)
346			{
347			if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
348			ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
349
350	root	1.91	rbuf = ws_inbuf + ws_inbuf_len;
351	root	1.90	amount = ws_inbuf_alloc - ws_inbuf_len;
352			}
353			else
354			{
355	root	1.91	rbuf = inbuf + inbuf_len;
356	root	1.90	amount = sizeof (inbuf) - inbuf_len;
357			}
358	root	1.12
359	root	1.23	if (!amount)
360	root	1.5	{
361	root	1.23	// input buffer full
362	root	1.87	LOG (llevError, "input buffer overflow.");
363			destroy ();
364	root	1.23	return;
365	root	1.3	}
366	elmex	1.1
367	root	1.91	amount = read (fd, rbuf, amount);
368	root	1.90
369			if (!amount)
370			{
371			destroy ();
372			return;
373			}
374			else if (amount < 0)
375			{
376			if (errno != EAGAIN && errno != EINTR)
377			{
378			LOG (llevError, "read error: %s\n", strerror (errno));
379			destroy ();
380			return;
381			}
382
383			// should not be here, normally
384			}
385
386	root	1.87	if (ws_version)
387			{
388	root	1.90	ws_inbuf_len += amount;
389	root	1.87
390	root	1.90	while (ws_inbuf_len)
391	root	1.87	{
392			if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
393	root	1.90	break;
394	root	1.87
395	root	1.90	int d = 2;
396			int fin = ws_inbuf [0] & 0x80;
397			int op = ws_inbuf [0] & 0x0f;
398			int len = ws_inbuf [1] & 0x7f;
399	root	1.87
400	root	1.90	if (len == 126)
401	root	1.87	{
402	root	1.90	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
403	root	1.87	d += 2;
404			}
405	root	1.90	else if (len == 127)
406	root	1.87	{
407			if (ws_inbuf_len < 2 + 8)
408			return;
409
410			// we don't do extra long frames, if a browser wants to send >2**32 bytes,
411			// there are bigger issues to fix.
412	root	1.90	len = (ws_inbuf [8] << 8) \| ws_inbuf [9];
413	root	1.87	d += 8;
414			}
415
416			// we only continue if we have a complete frame
417	root	1.90	if (ws_inbuf_len < d + 4 + len)
418	root	1.87	return;
419
420	root	1.90	switch (op)
421	root	1.87	{
422	root	1.90	case 0: op = ws_inbuf_type; break; // continuation
423			case 1: ws_inbuf_type = 1; break; // utf-8
424			case 2: ws_inbuf_type = 2; break; // binary
425	root	1.87	}
426
427	root	1.90	if (len > sizeof (inbuf) - inbuf_len)
428	root	1.87	{
429			// input buffer full
430			LOG (llevError, "input buffer overflow (ws).");
431			destroy ();
432			return;
433			}
434
435	root	1.90	uint8 *buf = inbuf + inbuf_len + 2;
436
437			for (int i = 0; i < len; ++i)
438			buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
439	root	1.87
440			// remove frame
441	root	1.90	ws_inbuf_len -= d + 4 + len;
442			memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
443	root	1.87
444	root	1.90	switch (op)
445	root	1.87	{
446			case 1: // utf-8
447	root	1.90	// utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
448			// but we assume that these extra-long packets will be rare.
449	root	1.88	{
450	root	1.90	uint8 *a = buf;
451	root	1.88	uint8 *b = a;
452	root	1.90	uint8 *c = a + len;
453	root	1.88
454			for (; a < c; ++a, ++b)
455			{
456			b = a;
457
458			if (*a >= 0x80)
459			*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
460			}
461
462	root	1.90	len -= a - b;
463	root	1.88	}
464	root	1.90	/* FALLTHROUGH */
465	root	1.87	case 2: // binary
466	root	1.90	inbuf_len += len;
467
468			if (fin)
469			{
470			inbuf [0] = inbuf_len >> 8;
471			inbuf [1] = inbuf_len;
472
473			inbuf_len += 2;
474
475			inbuf_handle ();
476			}
477	root	1.87	break;
478
479	root	1.90	case 9: // ping
480	root	1.87	{
481			// send pong - we assume ping messages are <64k
482			// as we can't handle >10k at the moment anyway.
483	root	1.90	uint8 hdr [] = { 0x8a, 126, len >> 8, len };
484	root	1.87	send (hdr, sizeof (hdr));
485	root	1.90	send (inbuf + inbuf_len, len);
486	root	1.87	}
487	root	1.90	break;
488	root	1.87
489			case 10: // pong
490	root	1.90	break;
491	root	1.87
492			case 8: // close
493			default:
494			destroy ();
495			return;
496			}
497	root	1.3	}
498			}
499	root	1.23	else
500			{
501			inbuf_len += amount;
502	root	1.86	inbuf_handle ();
503	root	1.23	}
504	root	1.5	}
505	root	1.12	}
506
507	elmex	1.1	/*******************************************************************************
508			*
509			* Start of write related routines.
510			*
511			******************************************************************************/
512
513			/**
514			* Adds data to a socket buffer for whatever reason.
515			*
516			* ns is the socket we are adding the data to, buf is the start of the
517			* data, and len is the number of bytes to add.
518			*/
519	root	1.20	void
520	root	1.22	client::send (void *buf_, int len)
521	root	1.20	{
522			char buf = (char )buf_;
523	elmex	1.1
524	root	1.29	if (destroyed () \|\| !buf)
525	root	1.23	return;
526	elmex	1.1
527	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
528	root	1.5	{
529	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
530	root	1.36	// shutdown the socket, this is safer than destroying it immediately
531			// as lots of code in the callchain might still access the map etc.
532			shutdown (fd, SHUT_RDWR);
533	root	1.5	return;
534			}
535
536	root	1.20	int avail, end;
537
538	root	1.5	/* data + end is where we start putting the new data. The last byte
539			* currently in use is actually data + end -1
540			*/
541	root	1.20	end = outputbuffer.start + outputbuffer.len;
542	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
543			if (end >= SOCKETBUFSIZE)
544			end -= SOCKETBUFSIZE;
545	root	1.7
546	root	1.5	avail = SOCKETBUFSIZE - end;
547	elmex	1.1
548	root	1.5	/* We can all fit it behind the current data without wrapping */
549			if (avail >= len)
550	root	1.20	memcpy (outputbuffer.data + end, buf, len);
551	root	1.5	else
552			{
553	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
554			memcpy (outputbuffer.data, buf + avail, len - avail);
555	elmex	1.1	}
556	root	1.7
557	root	1.20	outputbuffer.len += len;
558	elmex	1.1	}
559
560			/**
561			* Takes a string of data, and writes it out to the socket. A very handy
562			* shortcut function.
563			*/
564	root	1.13	void
565	root	1.22	client::send_packet (packet &sl)
566	root	1.13	{
567	root	1.29	if (destroyed ())
568	root	1.19	return;
569
570	root	1.55	if (sl.length () > MAXSOCKBUF)
571	root	1.19	{
572			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
573			/* Almost certainly we've overflowed a buffer, so quit now to make
574			* it easier to debug.
575			*/
576			abort ();
577			}
578
579			if (!sl.length ())
580			return;
581
582	root	1.87	if (ws_version == 8)
583			{
584	root	1.88	static uint8 buf [MAXSOCKBUF * 2 + 4];
585
586			uint8 *b = buf + 4;
587			for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
588			{
589			if (*a < 0x80)
590			b++ = a;
591			else
592			{
593			b++ = 0xc0 \| ((a >> 6) & 0x1f);
594			b++ = 0x80 \| ( a & 0x3f);
595			}
596			}
597
598			assert (b - buf < sizeof (buf));
599
600	root	1.90	int len = b - (buf + 4);
601	root	1.88
602	root	1.90	if (len < 126)
603	root	1.88	{
604			buf [2] = 0x81;
605	root	1.90	buf [3] = len;
606	root	1.88
607	root	1.90	send (buf + 2, len + 2);
608	root	1.88	}
609			else
610			{
611			buf [0] = 0x81;
612			buf [1] = 126;
613	root	1.90	buf [2] = len >> 8;
614			buf [3] = len;
615	root	1.88
616	root	1.90	send (buf, len + 4);
617	root	1.88	}
618	root	1.87	}
619			else if (ws_version == 13)
620			{
621	root	1.90	int len = sl.length ();
622	root	1.88
623	root	1.90	if (len < 126)
624	root	1.88	{
625	root	1.90	uint8 hdr [] = { 0x82, len };
626	root	1.88	send (hdr, sizeof (hdr));
627			}
628			else
629			{
630	root	1.90	uint8 hdr [] = { 0x82, 126, len >> 8, len };
631	root	1.88	send (hdr, sizeof (hdr));
632			}
633
634	root	1.90	send (sl.buf_ + sl.hdrlen, len);
635	root	1.87	}
636			else
637			{
638			assert (sl.hdrlen == 2);
639	root	1.19
640	root	1.87	sl.buf_ [0] = sl.length () >> 8;
641			sl.buf_ [1] = sl.length () ;
642	root	1.19
643	root	1.87	send (sl.buf_, sl.length () + sl.hdrlen);
644			}
645	root	1.13	}
646
647	root	1.5	void
648	root	1.22	client::send_packet (const char *buf, int len)
649	elmex	1.1	{
650	root	1.14	packet sl;
651	elmex	1.1
652	root	1.100	sl << data_n (buf, len);
653	root	1.13	send_packet (sl);
654	elmex	1.1	}
655
656	root	1.13	void
657	root	1.22	client::send_packet (const char *buf)
658	root	1.13	{
659			send_packet (buf, strlen (buf));
660			}
661	elmex	1.1
662	root	1.23	void
663			client::send_packet_printf (const char *format, ...)
664			{
665			packet sl;
666
667			va_list ap;
668			va_start (ap, format);
669			sl.vprintf (format, ap);
670			va_end (ap);
671
672			send_packet (sl);
673			}
674
675	root	1.40	void
676			client::send_msg (int color, const char type, const char msg)
677			{
678	root	1.58	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
679			{
680			LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
681			return;
682			}
683
684	root	1.59	int len = strlen (msg);
685
686	root	1.66	if (!(color & NDI_VERBATIM)
687			&& (msg_is_special (msg)
688			\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
689	root	1.48	cfperl_send_msg (this, color, type, msg);
690	root	1.69	else
691	root	1.53	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
692	root	1.40	}
693
694	root	1.23	/***********************************************************************
695			*
696			* packet functions/utilities
697			*
698			**********************************************************************/
699
700	root	1.27	packet::packet (const char *name)
701			{
702			reset ();
703
704			int len = strlen (name);
705			memcpy (cur, name, len); cur += len;
706			*cur++ = ' ';
707			}
708
709	root	1.37	packet &packet::operator <<(const ber32 v)
710			{
711	root	1.79	enum { maxlen = 32 / 7 + 1 };
712	root	1.37	uint8 buf[maxlen];
713			uint8 *p = buf + maxlen;
714			uint32 val = v.val;
715
716	root	1.38	*--p = val & 0x7F;
717
718	root	1.37	while (val > 0x7F)
719			{
720	root	1.38	val >>= 7;
721	root	1.37	*--p = (val & 0x7F) \| 0x80;
722			}
723
724	root	1.100	return *this << data_n (p, buf + maxlen - p);
725	root	1.37	}
726
727	root	1.100	packet &packet::operator <<(const data_n &v)
728	root	1.23	{
729			if (room () < v.len)
730			reset ();
731			else
732			{
733			if (v.len)
734			{
735			memcpy (cur, v.ptr, v.len);
736			cur += v.len;
737			}
738			}
739
740			return *this;
741			}
742
743			packet &packet::operator <<(const data8 &v)
744			{
745			unsigned int len = min (v.len, 0x00FF);
746	root	1.100	return *this << uint8 (len) << data_n (v.ptr, len);
747	root	1.23	}
748
749			packet &packet::operator <<(const data16 &v)
750			{
751			unsigned int len = min (v.len, 0xFFFF);
752	root	1.100	return *this << uint16 (len) << data_n (v.ptr, len);
753	root	1.23	}
754
755			packet &packet::operator <<(const char *v)
756			{
757	root	1.100	return *this << data_n (v, v ? strlen (v) : 0);
758	root	1.23	}
759
760			void
761			packet::vprintf (const char *format, va_list ap)
762			{
763			int size = room ();
764
765			int len = vsnprintf ((char *)cur, size, format, ap);
766
767			if (len >= size)
768			return reset ();
769
770			cur += len;
771			}
772