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
    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:	1.69
Committed:	Sun Dec 28 06:59:27 2008 UTC (17 years, 1 month ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_76, rel-2_77, rel-2_74, rel-2_75
Changes since 1.68:	+1 -5 lines
Log Message:	smell, remove gcfclient support, material fixes, cfpod parse fixes, refactoring
#	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
8	* 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	*
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 GNU General Public License
18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
19	*
20	* The authors can be reached via e-mail to <support@deliantra.net>
21	*/
22
23	using namespace std;
24
25	#include <global.h>
26	#include <sproto.h>
27	#include <cstdarg>
28
29	#if HAVE_TCP_INFO
30	# include <sys/types.h>
31	# include <sys/socket.h>
32	# include <netinet/in.h>
33	# include <netinet/tcp.h>
34	#endif
35
36	// force a packet when idle for more than this many seconds,
37	// forcing an ack regularly.
38	#define IDLE_PING 2.
39
40	void
41	client::flush ()
42	{
43	if (destroyed ())
44	return;
45
46	/**
47	* Writes data to socket.
48	*
49	* When the socket is clear to write, and we have backlogged data, this
50	* is called to write it out.
51	*/
52
53	// write a nop to the socket at least every IDLE_NOP seconds.
54	if (!outputbuffer.len)
55	{
56	if (last_send + IDLE_PING <= NOW && pl && pl->active)
57	{
58	// this is a bit ugly, but 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	if (socket_ev.poll () & EV_WRITE)
68	return;
69
70	last_send = NOW;
71	write_outputbuffer ();
72	}
73
74	void
75	client::write_outputbuffer ()
76	{
77	while (outputbuffer.len)
78	{
79	int res = write (fd, outputbuffer.data + outputbuffer.start,
80	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
81
82	if (res > 0)
83	{
84	outputbuffer.start += res;
85	/* wrap back to start of buffer */
86	if (outputbuffer.start == SOCKETBUFSIZE)
87	outputbuffer.start = 0;
88
89	outputbuffer.len -= res;
90	}
91	else if (res == 0)
92	{
93	LOG (llevError, "socket write failed, connection closed.\n");
94	destroy ();
95	return;
96	}
97	else if (errno == EINTR)
98	{
99	// just retry
100	}
101	else if (errno == EAGAIN)
102	{
103	// delay till ready
104	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
105	socket_ev.start ();
106	return;
107	}
108	else
109	{
110	LOG (llevError, "socket write failed: %s\n", strerror (errno));
111	destroy ();
112	return;
113	}
114	}
115
116	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
117	}
118
119	/******************************************************************************
120	*
121	* Start of read routines.
122	*
123	******************************************************************************/
124
125	int
126	client::next_packet ()
127	{
128	if (inbuf_len >= 2)
129	{
130	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
131
132	if (inbuf_len >= 2 + pkt_len)
133	return 2 + pkt_len;
134
135	if (inbuf_len == sizeof (inbuf))
136	{
137	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
138	destroy ();
139	return -1;
140	}
141	}
142
143	return 0;
144	}
145
146	void
147	client::skip_packet (int len)
148	{
149	inbuf_len -= len;
150	memmove (inbuf, inbuf + len, inbuf_len);
151	}
152
153	/*****************************************************************************
154	* Start of command dispatch area.
155	* The commands here are protocol commands.
156	****************************************************************************/
157
158	// SocketCommand, PlayingCommand, should not exist with those ugly casts
159	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
160	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
161
162	/**
163	* Dispatch table for the server.
164	*/
165	static struct packet_type packets[] = {
166	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
167	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
168
169	{"examine", PC(ExamineCmd) PF_PLAYING },
170	{"ex", PC(ExCmd) PF_PLAYING },
171	{"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	{"ext", PC(ExtCmd) 0 }, // CF+
177	{"mapredraw", PC(MapRedrawCmd) 0 },
178	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
179
180	{"reply", SC(ReplyCmd) 0 },
181	{"exti", SC(ExtiCmd) 0 }, // CF+
182	{"addme", SC(AddMeCmd) 0 },
183	{"askface", SC(AskFaceCmd) 0 },
184	{"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	};
190
191	bool
192	client::may_execute (const packet_type *pkt) const
193	{
194	return (!(pkt->flags & PF_PLAYER) \|\| pl)
195	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
196	}
197
198	// 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	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
224	return false;
225	}
226
227	void
228	client::execute (const packet_type pkt, char data, int datalen)
229	{
230	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
231	{
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	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
240	}
241
242	bool
243	client::handle_packet ()
244	{
245	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
278	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
279	if (!strcmp ((char *)inbuf + 2, pkt->name))
280	{
281	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
282	queue_command (pkt, data, datalen);
283	else
284	execute (pkt, data, datalen);
285
286	goto next_packet;
287	}
288
289	// If we get here, we didn't find a valid command.
290	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
291	next_packet:
292	skip_packet (pkt_len);
293
294	// input buffer has space again
295	socket_ev.poll (socket_ev.poll () \| EV_READ);
296
297	return true;
298	}
299
300	// callback called when socket is either readable or writable
301	void
302	client::socket_cb (iow &w, int revents)
303	{
304	//TODO remove when we have better socket cleanup logic
305	if (destroyed ())
306	{
307	socket_ev.poll (0);
308	return;
309	}
310
311	if (revents & EV_WRITE)
312	{
313	write_outputbuffer ();
314
315	if (!outputbuffer.len)
316	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
317	}
318
319	if (revents & EV_READ)
320	{
321	//TODO: rate-limit tcp connection in better ways, important
322
323	int amount = sizeof (inbuf) - inbuf_len;
324
325	if (!amount)
326	{
327	// input buffer full
328	socket_ev.poll (socket_ev.poll () & ~EV_READ);
329	return;
330	}
331
332	amount = read (fd, inbuf + inbuf_len, amount);
333
334	if (!amount)
335	{
336	destroy ();
337	return;
338	}
339	else if (amount < 0)
340	{
341	if (errno != EAGAIN && errno != EINTR)
342	{
343	LOG (llevError, "read error: %s\n", strerror (errno));
344	destroy ();
345	return;
346	}
347
348	// should not be here, normally
349	}
350	else
351	{
352	inbuf_len += amount;
353
354	if (handle_packet ())
355	{
356	while (handle_packet ())
357	;
358
359	flush ();
360	}
361	}
362	}
363	}
364
365	/*******************************************************************************
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	void
378	client::send (void *buf_, int len)
379	{
380	char buf = (char )buf_;
381
382	if (destroyed () \|\| !buf)
383	return;
384
385	if (len + outputbuffer.len > SOCKETBUFSIZE)
386	{
387	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
388	// 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	return;
392	}
393
394	int avail, end;
395
396	/* data + end is where we start putting the new data. The last byte
397	* currently in use is actually data + end -1
398	*/
399	end = outputbuffer.start + outputbuffer.len;
400	/* The buffer is already in a wrapped state, so adjust end */
401	if (end >= SOCKETBUFSIZE)
402	end -= SOCKETBUFSIZE;
403
404	avail = SOCKETBUFSIZE - end;
405
406	/* We can all fit it behind the current data without wrapping */
407	if (avail >= len)
408	memcpy (outputbuffer.data + end, buf, len);
409	else
410	{
411	memcpy (outputbuffer.data + end, buf, avail);
412	memcpy (outputbuffer.data, buf + avail, len - avail);
413	}
414
415	outputbuffer.len += len;
416	}
417
418	/**
419	* Takes a string of data, and writes it out to the socket. A very handy
420	* shortcut function.
421	*/
422	void
423	client::send_packet (packet &sl)
424	{
425	if (destroyed ())
426	return;
427
428	if (sl.length () > MAXSOCKBUF)
429	{
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	}
447
448	void
449	client::send_packet (const char *buf, int len)
450	{
451	packet sl;
452
453	sl << data (buf, len);
454	send_packet (sl);
455	}
456
457	void
458	client::send_packet (const char *buf)
459	{
460	send_packet (buf, strlen (buf));
461	}
462
463	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	void
477	client::send_msg (int color, const char type, const char msg)
478	{
479	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	int len = strlen (msg);
486
487	if (!(color & NDI_VERBATIM)
488	&& (msg_is_special (msg)
489	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
490	cfperl_send_msg (this, color, type, msg);
491	else
492	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
493	}
494
495	void
496	client::send_drawinfo (const char *msg, int flags)
497	{
498	send_msg (flags, "log", msg);
499	}
500
501	/***********************************************************************
502	*
503	* packet functions/utilities
504	*
505	**********************************************************************/
506
507	packet::packet (const char *name)
508	{
509	reset ();
510
511	int len = strlen (name);
512	memcpy (cur, name, len); cur += len;
513	*cur++ = ' ';
514	}
515
516	packet &packet::operator <<(const ber32 v)
517	{
518	enum { maxlen = 32 / 7 + 1};
519	uint8 buf[maxlen];
520	uint8 *p = buf + maxlen;
521	uint32 val = v.val;
522
523	*--p = val & 0x7F;
524
525	while (val > 0x7F)
526	{
527	val >>= 7;
528	*--p = (val & 0x7F) \| 0x80;
529	}
530
531	return *this << data (p, buf + maxlen - p);
532	}
533
534	packet &packet::operator <<(const data &v)
535	{
536	if (room () < v.len)
537	reset ();
538	else
539	{
540	if (v.len)
541	{
542	memcpy (cur, v.ptr, v.len);
543	cur += v.len;
544	}
545	}
546
547	return *this;
548	}
549
550	packet &packet::operator <<(const data8 &v)
551	{
552	unsigned int len = min (v.len, 0x00FF);
553	return *this << uint8 (len) << data (v.ptr, len);
554	}
555
556	packet &packet::operator <<(const data16 &v)
557	{
558	unsigned int len = min (v.len, 0xFFFF);
559	return *this << uint16 (len) << data (v.ptr, len);
560	}
561
562	packet &packet::operator <<(const char *v)
563	{
564	return *this << data (v, strlen (v ? v : 0));
565	}
566
567	void
568	packet::vprintf (const char *format, va_list ap)
569	{
570	int size = room ();
571
572	int len = vsnprintf ((char *)cur, size, format, ap);
573
574	if (len >= size)
575	return reset ();
576
577	cur += len;
578	}
579