server/socket/lowlevel.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Deliantra is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 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 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 map1/map1a seem to be the only
          // nop'able commands and they are quite small.
          packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
          send_packet (sl);
        }
      else
        return;
    }

  if (socket_ev.poll () & 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 |

/**
 * Dispatch table for the server.
 */
static struct packet_type packets[] = {
  {"ncom",        PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
  {"command",     PC(PlayerCmd)    PF_PLAYING | PF_COMMAND0 },

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

  {"reply",       SC(ReplyCmd)     0 },
  {"exti",        SC(ExtiCmd)      0 }, // CF+
  {"addme",       SC(AddMeCmd)     0 },
  {"askface",     SC(AskFaceCmd)   0 },
  {"requestinfo", SC(RequestInfo)  0 },
  {"setsound",    SC(SetSound)     0 },
  {"setup",       SC(SetUp)        0 },
  {"version",     SC(VersionCmd)   0 },
  {"toggleextendedtext",  SC(ToggleExtendedText)  0 },   /*Added: tchize */
};

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 == 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);
      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;
    }

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

  /* First, break out beginning word.  There are at least
   * a few commands that do not have any paremeters.  If
   * we get such a command, don't worry about trying
   * to break it up.
   */
  int datalen;
  char *data = strchr ((char *)inbuf + 2, ' ');

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

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

        goto next_packet;
      }

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

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

  return true;
}

// 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
          socket_ev.poll (socket_ev.poll () & ~EV_READ);
          return;
        }

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

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

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

          if (handle_packet ())
            {
              while (handle_packet ())
                ;

              flush ();
            }
        }
    }
}

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

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

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

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

  int avail, end;

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

  avail = SOCKETBUFSIZE - end;

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

  outputbuffer.len += len;
}

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

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

  if (!sl.length ())
    return;

  assert (sl.hdrlen == 2);

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

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

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

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

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

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

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

  send_packet (sl);
}

void
client::send_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 if (can_msg)
    send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
  else if (color < 0)
    return; // client cannot handle this
  else
    send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, 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:	1.68
Committed:	Sat Dec 27 01:25:00 2008 UTC (15 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.67:	+0 -2 lines
Log Message:	gcfclient removal
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.62	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	pippijn	1.32	*
4	root	1.64	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	root	1.42	* Copyright (©) 1992,2007 Frank Tore Johansen
6			*
7	root	1.62	* Deliantra is free software: you can redistribute it and/or modify
8	root	1.49	* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation, either version 3 of the License, or
10			* (at your option) any later version.
11	root	1.42	*
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	1.42	*
17	root	1.49	* You should have received a copy of the GNU General Public License
18			* along with this program. If not, see <http://www.gnu.org/licenses/>.
19	pippijn	1.32	*
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			// this is a bit ugly, but map1/map1a seem to be the only
59			// nop'able commands and they are quite small.
60			packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
61			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			/**
163			* Dispatch table for the server.
164			*/
165			static struct packet_type packets[] = {
166	root	1.33	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
167			{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
168	root	1.23
169			{"examine", PC(ExamineCmd) PF_PLAYING },
170	root	1.39	{"ex", PC(ExCmd) PF_PLAYING },
171	root	1.23	{"apply", PC(ApplyCmd) PF_PLAYING },
172			{"lookat", PC(LookAt) PF_PLAYING },
173			{"lock", PC(LockItem) PF_PLAYING },
174			{"mark", PC(MarkItem) PF_PLAYING },
175			{"move", PC(MoveCmd) PF_PLAYING },
176	root	1.39	{"ext", PC(ExtCmd) 0 }, // CF+
177			{"mapredraw", PC(MapRedrawCmd) 0 },
178			{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
179	root	1.23
180	root	1.28	{"reply", SC(ReplyCmd) 0 },
181	root	1.39	{"exti", SC(ExtiCmd) 0 }, // CF+
182	root	1.26	{"addme", SC(AddMeCmd) 0 },
183	root	1.36	{"askface", SC(AskFaceCmd) 0 },
184	root	1.26	{"requestinfo", SC(RequestInfo) 0 },
185			{"setsound", SC(SetSound) 0 },
186			{"setup", SC(SetUp) 0 },
187			{"version", SC(VersionCmd) 0 },
188			{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
189	root	1.23	};
190
191			bool
192			client::may_execute (const packet_type *pkt) const
193	elmex	1.1	{
194	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
195	root	1.29	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
196	root	1.11	}
197	root	1.9
198	root	1.33	// HACK: some commands currently should be executed
199			// even when the player is frozen. this hack detects
200			// those commands. it should be folded into may_execute,
201			// but kept seperate to emphasise the hack aspect, i.e.
202			// do it better, then remove.
203			static bool
204			always_immediate (const client ns, const packet_type pkt, const char *data, int len)
205			{
206			if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
207			return false;
208
209			if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
210			return false;
211
212			if (pkt->flags & PF_COMMAND6)
213			{
214			data += 6;
215			len -= 6;
216			}
217
218	root	1.61	if (len > 4 && data [3] == ' ' && !strncmp (data, "say " , 4)) return true;
219			if (len > 5 && data [4] == ' ' && !strncmp (data, "chat " , 5)) return true;
220			if (len > 6 && data [5] == ' ' && !strncmp (data, "shout ", 6)) return true;
221
222			if (len == 7 && !strcmp (data, "suicide")) return true;
223	root	1.33
224			return false;
225			}
226
227	root	1.23	void
228			client::execute (const packet_type pkt, char data, int datalen)
229	root	1.11	{
230	root	1.33	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
231	root	1.23	{
232			//TODO: only one format
233			if (pkt->flags & PF_PLAYER)
234			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
235			else
236			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
237			}
238			else
239	root	1.53	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
240	elmex	1.1	}
241
242	root	1.23	bool
243			client::handle_packet ()
244	root	1.10	{
245	root	1.23	int pkt_len = next_packet ();
246
247			if (!pkt_len)
248			return false;
249			else if (pkt_len < 0)
250			{
251			LOG (llevError, "read error on player %s\n",
252			pl && pl->ob ? &pl->ob->name : "[anonymous]");
253			destroy ();
254			return false;
255			}
256
257			inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
258
259			/* First, break out beginning word. There are at least
260			* a few commands that do not have any paremeters. If
261			* we get such a command, don't worry about trying
262			* to break it up.
263			*/
264			int datalen;
265			char data = strchr ((char )inbuf + 2, ' ');
266
267			if (data)
268			{
269			*data++ = 0;
270			datalen = pkt_len - (data - (char *)inbuf);
271			}
272			else
273			{
274			data = (char *)inbuf + 2; // better read garbage than segfault
275			datalen = 0;
276			}
277	root	1.15
278	root	1.23	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
279			if (!strcmp ((char *)inbuf + 2, pkt->name))
280			{
281	root	1.33	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
282	root	1.26	queue_command (pkt, data, datalen);
283			else
284	root	1.23	execute (pkt, data, datalen);
285
286			goto next_packet;
287			}
288
289	root	1.26	// If we get here, we didn't find a valid command.
290	root	1.53	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
291	root	1.23	next_packet:
292			skip_packet (pkt_len);
293	root	1.11
294	root	1.23	// input buffer has space again
295	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_READ);
296	root	1.10
297	root	1.23	return true;
298	root	1.10	}
299
300	root	1.23	// callback called when socket is either readable or writable
301			void
302	root	1.63	client::socket_cb (iow &w, int revents)
303	root	1.23	{
304			//TODO remove when we have better socket cleanup logic
305	root	1.29	if (destroyed ())
306	root	1.23	{
307			socket_ev.poll (0);
308			return;
309			}
310	elmex	1.1
311	root	1.63	if (revents & EV_WRITE)
312	root	1.5	{
313	root	1.23	write_outputbuffer ();
314
315			if (!outputbuffer.len)
316	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
317	root	1.23	}
318	root	1.12
319	root	1.63	if (revents & EV_READ)
320	root	1.23	{
321			//TODO: rate-limit tcp connection in better ways, important
322	pippijn	1.8
323	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
324
325	root	1.23	if (!amount)
326	root	1.5	{
327	root	1.23	// input buffer full
328	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_READ);
329	root	1.23	return;
330	root	1.3	}
331	elmex	1.1
332	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
333
334			if (!amount)
335	root	1.5	{
336	root	1.23	destroy ();
337			return;
338	root	1.5	}
339	root	1.12	else if (amount < 0)
340	root	1.5	{
341	root	1.12	if (errno != EAGAIN && errno != EINTR)
342	root	1.5	{
343	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
344	root	1.23	destroy ();
345			return;
346	root	1.3	}
347	root	1.12
348	root	1.23	// should not be here, normally
349	root	1.3	}
350	root	1.23	else
351			{
352			inbuf_len += amount;
353	root	1.12
354	root	1.60	if (handle_packet ())
355			{
356			while (handle_packet ())
357			;
358
359			flush ();
360			}
361	root	1.23	}
362	root	1.5	}
363	root	1.12	}
364
365	elmex	1.1	/*******************************************************************************
366			*
367			* Start of write related routines.
368			*
369			******************************************************************************/
370
371			/**
372			* Adds data to a socket buffer for whatever reason.
373			*
374			* ns is the socket we are adding the data to, buf is the start of the
375			* data, and len is the number of bytes to add.
376			*/
377	root	1.20	void
378	root	1.22	client::send (void *buf_, int len)
379	root	1.20	{
380			char buf = (char )buf_;
381	elmex	1.1
382	root	1.29	if (destroyed () \|\| !buf)
383	root	1.23	return;
384	elmex	1.1
385	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
386	root	1.5	{
387	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
388	root	1.36	// shutdown the socket, this is safer than destroying it immediately
389			// as lots of code in the callchain might still access the map etc.
390			shutdown (fd, SHUT_RDWR);
391	root	1.5	return;
392			}
393
394	root	1.20	int avail, end;
395
396	root	1.5	/* data + end is where we start putting the new data. The last byte
397			* currently in use is actually data + end -1
398			*/
399	root	1.20	end = outputbuffer.start + outputbuffer.len;
400	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
401			if (end >= SOCKETBUFSIZE)
402			end -= SOCKETBUFSIZE;
403	root	1.7
404	root	1.5	avail = SOCKETBUFSIZE - end;
405	elmex	1.1
406	root	1.5	/* We can all fit it behind the current data without wrapping */
407			if (avail >= len)
408	root	1.20	memcpy (outputbuffer.data + end, buf, len);
409	root	1.5	else
410			{
411	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
412			memcpy (outputbuffer.data, buf + avail, len - avail);
413	elmex	1.1	}
414	root	1.7
415	root	1.20	outputbuffer.len += len;
416	elmex	1.1	}
417
418			/**
419			* Takes a string of data, and writes it out to the socket. A very handy
420			* shortcut function.
421			*/
422	root	1.13	void
423	root	1.22	client::send_packet (packet &sl)
424	root	1.13	{
425	root	1.29	if (destroyed ())
426	root	1.19	return;
427
428	root	1.55	if (sl.length () > MAXSOCKBUF)
429	root	1.19	{
430			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
431			/* Almost certainly we've overflowed a buffer, so quit now to make
432			* it easier to debug.
433			*/
434			abort ();
435			}
436
437			if (!sl.length ())
438			return;
439
440			assert (sl.hdrlen == 2);
441
442			sl.buf_ [0] = sl.length () >> 8;
443			sl.buf_ [1] = sl.length () ;
444
445			send (sl.buf_, sl.length () + sl.hdrlen);
446	root	1.13	}
447
448	root	1.5	void
449	root	1.22	client::send_packet (const char *buf, int len)
450	elmex	1.1	{
451	root	1.14	packet sl;
452	elmex	1.1
453	root	1.13	sl << data (buf, len);
454			send_packet (sl);
455	elmex	1.1	}
456
457	root	1.13	void
458	root	1.22	client::send_packet (const char *buf)
459	root	1.13	{
460			send_packet (buf, strlen (buf));
461			}
462	elmex	1.1
463	root	1.23	void
464			client::send_packet_printf (const char *format, ...)
465			{
466			packet sl;
467
468			va_list ap;
469			va_start (ap, format);
470			sl.vprintf (format, ap);
471			va_end (ap);
472
473			send_packet (sl);
474			}
475
476	root	1.40	void
477			client::send_msg (int color, const char type, const char msg)
478			{
479	root	1.58	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
480			{
481			LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
482			return;
483			}
484
485	root	1.59	int len = strlen (msg);
486
487	root	1.66	if (!(color & NDI_VERBATIM)
488			&& (msg_is_special (msg)
489			\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
490	root	1.48	cfperl_send_msg (this, color, type, msg);
491			else if (can_msg)
492	root	1.53	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
493	root	1.40	else if (color < 0)
494			return; // client cannot handle this
495			else
496	root	1.53	send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
497	root	1.40	}
498
499	root	1.48	void
500			client::send_drawinfo (const char *msg, int flags)
501			{
502			send_msg (flags, "log", msg);
503			}
504
505	root	1.23	/***********************************************************************
506			*
507			* packet functions/utilities
508			*
509			**********************************************************************/
510
511	root	1.27	packet::packet (const char *name)
512			{
513			reset ();
514
515			int len = strlen (name);
516			memcpy (cur, name, len); cur += len;
517			*cur++ = ' ';
518			}
519
520	root	1.37	packet &packet::operator <<(const ber32 v)
521			{
522			enum { maxlen = 32 / 7 + 1};
523			uint8 buf[maxlen];
524			uint8 *p = buf + maxlen;
525			uint32 val = v.val;
526
527	root	1.38	*--p = val & 0x7F;
528
529	root	1.37	while (val > 0x7F)
530			{
531	root	1.38	val >>= 7;
532	root	1.37	*--p = (val & 0x7F) \| 0x80;
533			}
534
535			return *this << data (p, buf + maxlen - p);
536			}
537
538	root	1.23	packet &packet::operator <<(const data &v)
539			{
540			if (room () < v.len)
541			reset ();
542			else
543			{
544			if (v.len)
545			{
546			memcpy (cur, v.ptr, v.len);
547			cur += v.len;
548			}
549			}
550
551			return *this;
552			}
553
554			packet &packet::operator <<(const data8 &v)
555			{
556			unsigned int len = min (v.len, 0x00FF);
557			return *this << uint8 (len) << data (v.ptr, len);
558			}
559
560			packet &packet::operator <<(const data16 &v)
561			{
562			unsigned int len = min (v.len, 0xFFFF);
563			return *this << uint16 (len) << data (v.ptr, len);
564			}
565
566			packet &packet::operator <<(const char *v)
567			{
568			return *this << data (v, strlen (v ? v : 0));
569			}
570
571			void
572			packet::vprintf (const char *format, va_list ap)
573			{
574			int size = room ();
575
576			int len = vsnprintf ((char *)cur, size, format, ap);
577
578			if (len >= size)
579			return reset ();
580
581			cur += len;
582			}
583