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 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 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 >  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);
      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 + (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:
  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;
}

// 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
    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:	1.72
Committed:	Tue Oct 13 18:20:08 2009 UTC (14 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_82
Changes since 1.71:	+4 -1 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 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 1992,2007 Frank Tore Johansen
6	*
7	* 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	*
12	* 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	*
17	* 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	*
21	* The authors can be reached via e-mail to <support@deliantra.net>
22	*/
23
24	using namespace std;
25
26	#include <global.h>
27	#include <sproto.h>
28	#include <cstdarg>
29
30	#if HAVE_TCP_INFO
31	# include <sys/types.h>
32	# include <sys/socket.h>
33	# include <netinet/in.h>
34	# include <netinet/tcp.h>
35	#endif
36
37	// force a packet when idle for more than this many seconds,
38	// forcing an ack regularly.
39	#define IDLE_PING 2.
40
41	void
42	client::flush ()
43	{
44	if (destroyed ())
45	return;
46
47	/**
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	// write a nop to the socket at least every IDLE_NOP seconds.
55	if (!outputbuffer.len)
56	{
57	if (last_send + IDLE_PING <= NOW && pl && pl->active)
58	{
59	// this is a bit ugly, but map1/map1a seem to be the only
60	// nop'able commands and they are quite small.
61	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
62	send_packet (sl);
63	}
64	else
65	return;
66	}
67
68	if (socket_ev.poll () & EV_WRITE)
69	return;
70
71	last_send = NOW;
72	write_outputbuffer ();
73	}
74
75	void
76	client::write_outputbuffer ()
77	{
78	while (outputbuffer.len)
79	{
80	int res = write (fd, outputbuffer.data + outputbuffer.start,
81	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
82
83	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	destroy ();
96	return;
97	}
98	else if (errno == EINTR)
99	{
100	// just retry
101	}
102	else if (errno == EAGAIN)
103	{
104	// delay till ready
105	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
106	socket_ev.start ();
107	return;
108	}
109	else
110	{
111	LOG (llevError, "socket write failed: %s\n", strerror (errno));
112	destroy ();
113	return;
114	}
115	}
116
117	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
118	}
119
120	/******************************************************************************
121	*
122	* Start of read routines.
123	*
124	******************************************************************************/
125
126	int
127	client::next_packet ()
128	{
129	if (inbuf_len >= 2)
130	{
131	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	{
138	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
139	destroy ();
140	return -1;
141	}
142	}
143
144	return 0;
145	}
146
147	void
148	client::skip_packet (int len)
149	{
150	inbuf_len -= len;
151	memmove (inbuf, inbuf + len, inbuf_len);
152	}
153
154	/*****************************************************************************
155	* Start of command dispatch area.
156	* The commands here are protocol commands.
157	****************************************************************************/
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	/**
164	* Dispatch table for the server.
165	*/
166	static struct packet_type packets[] = {
167	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
168	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
169
170	{"examine", PC(ExamineCmd) PF_PLAYING },
171	{"ex", PC(ExCmd) PF_PLAYING },
172	{"apply", PC(ApplyCmd) PF_PLAYING },
173	{"lookat", PC(LookAt) PF_PLAYING },
174	{"lock", PC(LockItem) PF_PLAYING },
175	{"mark", PC(MarkItem) PF_PLAYING },
176	{"move", PC(MoveCmd) PF_PLAYING },
177	{"ext", PC(ExtCmd) 0 }, // CF+
178	{"mapredraw", PC(MapRedrawCmd) 0 },
179	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
180
181	{"reply", SC(ReplyCmd) 0 },
182	{"exti", SC(ExtiCmd) 0 }, // CF+
183	{"addme", SC(AddMeCmd) 0 },
184	{"askface", SC(AskFaceCmd) 0 },
185	{"requestinfo", SC(RequestInfo) 0 },
186	{"setsound", SC(SetSound) 0 },
187	{"setup", SC(SetUp) 0 },
188	{"version", SC(VersionCmd) 0 },
189	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
190	};
191
192	bool
193	client::may_execute (const packet_type *pkt) const
194	{
195	return (!(pkt->flags & PF_PLAYER) \|\| pl)
196	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
197	}
198
199	// HACK: some commands currently should be executed
200	// even when the player is frozen. this hack detects
201	// those commands. it should be folded into may_execute,
202	// but kept seperate to emphasise the hack aspect, i.e.
203	// do it better, then remove.
204	static bool
205	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
206	{
207	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
208	return false;
209
210	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
211	return false;
212
213	if (pkt->flags & PF_COMMAND6)
214	{
215	data += 6;
216	len -= 6;
217	}
218
219	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
225	if (len == 7 && !strcmp (data, "suicide")) return true;
226
227	return false;
228	}
229
230	void
231	client::execute (const packet_type pkt, char data, int datalen)
232	{
233	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
234	{
235	//TODO: only one format
236	if (pkt->flags & PF_PLAYER)
237	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
238	else
239	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
240	}
241	else
242	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
243	}
244
245	bool
246	client::handle_packet ()
247	{
248	int pkt_len = next_packet ();
249
250	if (!pkt_len)
251	return false;
252	else if (pkt_len < 0)
253	{
254	LOG (llevError, "read error on player %s\n",
255	pl && pl->ob ? &pl->ob->name : "[anonymous]");
256	destroy ();
257	return false;
258	}
259
260	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
261	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
262
263	/* First, break out beginning word. There are at least
264	* a few commands that do not have any paremeters. If
265	* we get such a command, don't worry about trying
266	* to break it up.
267	*/
268	int datalen;
269	char data = strchr ((char )inbuf + 2, ' ');
270
271	if (data)
272	{
273	*data++ = 0;
274	datalen = pkt_len - (data - (char *)inbuf);
275	}
276	else
277	{
278	data = (char *)inbuf + 2; // better read garbage than segfault
279	datalen = 0;
280	}
281
282	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
283	if (!strcmp ((char *)inbuf + 2, pkt->name))
284	{
285	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
286	queue_command (pkt, data, datalen);
287	else
288	execute (pkt, data, datalen);
289
290	goto next_packet;
291	}
292
293	// If we get here, we didn't find a valid command.
294	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
295
296	next_packet:
297	inbuf [pkt_len] = save_byte; // rather ugly
298	skip_packet (pkt_len);
299
300	// input buffer has space again
301	socket_ev.poll (socket_ev.poll () \| EV_READ);
302
303	return true;
304	}
305
306	// callback called when socket is either readable or writable
307	void
308	client::socket_cb (iow &w, int revents)
309	{
310	//TODO remove when we have better socket cleanup logic
311	if (destroyed ())
312	{
313	socket_ev.poll (0);
314	return;
315	}
316
317	if (revents & EV_WRITE)
318	{
319	write_outputbuffer ();
320
321	if (!outputbuffer.len)
322	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
323	}
324
325	if (revents & EV_READ)
326	{
327	//TODO: rate-limit tcp connection in better ways, important
328
329	int amount = sizeof (inbuf) - inbuf_len;
330
331	if (!amount)
332	{
333	// input buffer full
334	socket_ev.poll (socket_ev.poll () & ~EV_READ);
335	return;
336	}
337
338	amount = read (fd, inbuf + inbuf_len, amount);
339
340	if (!amount)
341	{
342	destroy ();
343	return;
344	}
345	else if (amount < 0)
346	{
347	if (errno != EAGAIN && errno != EINTR)
348	{
349	LOG (llevError, "read error: %s\n", strerror (errno));
350	destroy ();
351	return;
352	}
353
354	// should not be here, normally
355	}
356	else
357	{
358	inbuf_len += amount;
359
360	if (handle_packet ())
361	{
362	while (handle_packet ())
363	;
364
365	flush ();
366	}
367	}
368	}
369	}
370
371	/*******************************************************************************
372	*
373	* Start of write related routines.
374	*
375	******************************************************************************/
376
377	/**
378	* Adds data to a socket buffer for whatever reason.
379	*
380	* ns is the socket we are adding the data to, buf is the start of the
381	* data, and len is the number of bytes to add.
382	*/
383	void
384	client::send (void *buf_, int len)
385	{
386	char buf = (char )buf_;
387
388	if (destroyed () \|\| !buf)
389	return;
390
391	if (len + outputbuffer.len > SOCKETBUFSIZE)
392	{
393	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394	// shutdown the socket, this is safer than destroying it immediately
395	// as lots of code in the callchain might still access the map etc.
396	shutdown (fd, SHUT_RDWR);
397	return;
398	}
399
400	int avail, end;
401
402	/* data + end is where we start putting the new data. The last byte
403	* currently in use is actually data + end -1
404	*/
405	end = outputbuffer.start + outputbuffer.len;
406	/* The buffer is already in a wrapped state, so adjust end */
407	if (end >= SOCKETBUFSIZE)
408	end -= SOCKETBUFSIZE;
409
410	avail = SOCKETBUFSIZE - end;
411
412	/* We can all fit it behind the current data without wrapping */
413	if (avail >= len)
414	memcpy (outputbuffer.data + end, buf, len);
415	else
416	{
417	memcpy (outputbuffer.data + end, buf, avail);
418	memcpy (outputbuffer.data, buf + avail, len - avail);
419	}
420
421	outputbuffer.len += len;
422	}
423
424	/**
425	* Takes a string of data, and writes it out to the socket. A very handy
426	* shortcut function.
427	*/
428	void
429	client::send_packet (packet &sl)
430	{
431	if (destroyed ())
432	return;
433
434	if (sl.length () > MAXSOCKBUF)
435	{
436	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
437	/* Almost certainly we've overflowed a buffer, so quit now to make
438	* it easier to debug.
439	*/
440	abort ();
441	}
442
443	if (!sl.length ())
444	return;
445
446	assert (sl.hdrlen == 2);
447
448	sl.buf_ [0] = sl.length () >> 8;
449	sl.buf_ [1] = sl.length () ;
450
451	send (sl.buf_, sl.length () + sl.hdrlen);
452	}
453
454	void
455	client::send_packet (const char *buf, int len)
456	{
457	packet sl;
458
459	sl << data (buf, len);
460	send_packet (sl);
461	}
462
463	void
464	client::send_packet (const char *buf)
465	{
466	send_packet (buf, strlen (buf));
467	}
468
469	void
470	client::send_packet_printf (const char *format, ...)
471	{
472	packet sl;
473
474	va_list ap;
475	va_start (ap, format);
476	sl.vprintf (format, ap);
477	va_end (ap);
478
479	send_packet (sl);
480	}
481
482	void
483	client::send_msg (int color, const char type, const char msg)
484	{
485	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
486	{
487	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
488	return;
489	}
490
491	int len = strlen (msg);
492
493	if (!(color & NDI_VERBATIM)
494	&& (msg_is_special (msg)
495	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
496	cfperl_send_msg (this, color, type, msg);
497	else
498	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
499	}
500
501	void
502	client::send_drawinfo (const char *msg, int flags)
503	{
504	send_msg (flags, "log", msg);
505	}
506
507	/***********************************************************************
508	*
509	* packet functions/utilities
510	*
511	**********************************************************************/
512
513	packet::packet (const char *name)
514	{
515	reset ();
516
517	int len = strlen (name);
518	memcpy (cur, name, len); cur += len;
519	*cur++ = ' ';
520	}
521
522	packet &packet::operator <<(const ber32 v)
523	{
524	enum { maxlen = 32 / 7 + 1};
525	uint8 buf[maxlen];
526	uint8 *p = buf + maxlen;
527	uint32 val = v.val;
528
529	*--p = val & 0x7F;
530
531	while (val > 0x7F)
532	{
533	val >>= 7;
534	*--p = (val & 0x7F) \| 0x80;
535	}
536
537	return *this << data (p, buf + maxlen - p);
538	}
539
540	packet &packet::operator <<(const data &v)
541	{
542	if (room () < v.len)
543	reset ();
544	else
545	{
546	if (v.len)
547	{
548	memcpy (cur, v.ptr, v.len);
549	cur += v.len;
550	}
551	}
552
553	return *this;
554	}
555
556	packet &packet::operator <<(const data8 &v)
557	{
558	unsigned int len = min (v.len, 0x00FF);
559	return *this << uint8 (len) << data (v.ptr, len);
560	}
561
562	packet &packet::operator <<(const data16 &v)
563	{
564	unsigned int len = min (v.len, 0xFFFF);
565	return *this << uint16 (len) << data (v.ptr, len);
566	}
567
568	packet &packet::operator <<(const char *v)
569	{
570	return *this << data (v, strlen (v ? v : 0));
571	}
572
573	void
574	packet::vprintf (const char *format, va_list ap)
575	{
576	int size = room ();
577
578	int len = vsnprintf ((char *)cur, size, format, ap);
579
580	if (len >= size)
581	return reset ();
582
583	cur += len;
584	}
585