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 *
#	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	1.71	* 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	1.42	*
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	1.71	* 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	pippijn	1.32	*
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	1.43	// write a nop to the socket at least every IDLE_NOP seconds.
55			if (!outputbuffer.len)
56			{
57	root	1.47	if (last_send + IDLE_PING <= NOW && pl && pl->active)
58	root	1.43	{
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	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	1.53	send_packet_printf ("drawinfo %d 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			* 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	root	1.33	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
168			{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
169	root	1.23
170			{"examine", PC(ExamineCmd) PF_PLAYING },
171	root	1.39	{"ex", PC(ExCmd) PF_PLAYING },
172	root	1.23	{"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	root	1.39	{"ext", PC(ExtCmd) 0 }, // CF+
178			{"mapredraw", PC(MapRedrawCmd) 0 },
179			{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
180	root	1.23
181	root	1.28	{"reply", SC(ReplyCmd) 0 },
182	root	1.39	{"exti", SC(ExtiCmd) 0 }, // CF+
183	root	1.26	{"addme", SC(AddMeCmd) 0 },
184	root	1.36	{"askface", SC(AskFaceCmd) 0 },
185	root	1.26	{"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	root	1.23	};
191
192			bool
193			client::may_execute (const packet_type *pkt) const
194	elmex	1.1	{
195	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
196	root	1.29	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
197	root	1.11	}
198	root	1.9
199	root	1.33	// 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	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			((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	root	1.53	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
243	elmex	1.1	}
244
245	root	1.23	bool
246			client::handle_packet ()
247	root	1.10	{
248	root	1.23	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	root	1.72	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
261			inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
262	root	1.23
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	root	1.15
282	root	1.23	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
283			if (!strcmp ((char *)inbuf + 2, pkt->name))
284			{
285	root	1.33	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
286	root	1.26	queue_command (pkt, data, datalen);
287			else
288	root	1.23	execute (pkt, data, datalen);
289
290			goto next_packet;
291			}
292
293	root	1.26	// If we get here, we didn't find a valid command.
294	root	1.53	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
295	root	1.72
296	root	1.23	next_packet:
297	root	1.72	inbuf [pkt_len] = save_byte; // rather ugly
298	root	1.23	skip_packet (pkt_len);
299	root	1.11
300	root	1.23	// input buffer has space again
301	root	1.63	socket_ev.poll (socket_ev.poll () \| EV_READ);
302	root	1.10
303	root	1.23	return true;
304	root	1.10	}
305
306	root	1.23	// callback called when socket is either readable or writable
307			void
308	root	1.63	client::socket_cb (iow &w, int revents)
309	root	1.23	{
310			//TODO remove when we have better socket cleanup logic
311	root	1.29	if (destroyed ())
312	root	1.23	{
313			socket_ev.poll (0);
314			return;
315			}
316	elmex	1.1
317	root	1.63	if (revents & EV_WRITE)
318	root	1.5	{
319	root	1.23	write_outputbuffer ();
320
321			if (!outputbuffer.len)
322	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
323	root	1.23	}
324	root	1.12
325	root	1.63	if (revents & EV_READ)
326	root	1.23	{
327			//TODO: rate-limit tcp connection in better ways, important
328	pippijn	1.8
329	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
330
331	root	1.23	if (!amount)
332	root	1.5	{
333	root	1.23	// input buffer full
334	root	1.63	socket_ev.poll (socket_ev.poll () & ~EV_READ);
335	root	1.23	return;
336	root	1.3	}
337	elmex	1.1
338	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
339
340			if (!amount)
341	root	1.5	{
342	root	1.23	destroy ();
343			return;
344	root	1.5	}
345	root	1.12	else if (amount < 0)
346	root	1.5	{
347	root	1.12	if (errno != EAGAIN && errno != EINTR)
348	root	1.5	{
349	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
350	root	1.23	destroy ();
351			return;
352	root	1.3	}
353	root	1.12
354	root	1.23	// should not be here, normally
355	root	1.3	}
356	root	1.23	else
357			{
358			inbuf_len += amount;
359	root	1.12
360	root	1.60	if (handle_packet ())
361			{
362			while (handle_packet ())
363			;
364
365			flush ();
366			}
367	root	1.23	}
368	root	1.5	}
369	root	1.12	}
370
371	elmex	1.1	/*******************************************************************************
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	root	1.20	void
384	root	1.22	client::send (void *buf_, int len)
385	root	1.20	{
386			char buf = (char )buf_;
387	elmex	1.1
388	root	1.29	if (destroyed () \|\| !buf)
389	root	1.23	return;
390	elmex	1.1
391	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
392	root	1.5	{
393	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394	root	1.36	// 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	root	1.5	return;
398			}
399
400	root	1.20	int avail, end;
401
402	root	1.5	/* data + end is where we start putting the new data. The last byte
403			* currently in use is actually data + end -1
404			*/
405	root	1.20	end = outputbuffer.start + outputbuffer.len;
406	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
407			if (end >= SOCKETBUFSIZE)
408			end -= SOCKETBUFSIZE;
409	root	1.7
410	root	1.5	avail = SOCKETBUFSIZE - end;
411	elmex	1.1
412	root	1.5	/* We can all fit it behind the current data without wrapping */
413			if (avail >= len)
414	root	1.20	memcpy (outputbuffer.data + end, buf, len);
415	root	1.5	else
416			{
417	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
418			memcpy (outputbuffer.data, buf + avail, len - avail);
419	elmex	1.1	}
420	root	1.7
421	root	1.20	outputbuffer.len += len;
422	elmex	1.1	}
423
424			/**
425			* Takes a string of data, and writes it out to the socket. A very handy
426			* shortcut function.
427			*/
428	root	1.13	void
429	root	1.22	client::send_packet (packet &sl)
430	root	1.13	{
431	root	1.29	if (destroyed ())
432	root	1.19	return;
433
434	root	1.55	if (sl.length () > MAXSOCKBUF)
435	root	1.19	{
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	root	1.13	}
453
454	root	1.5	void
455	root	1.22	client::send_packet (const char *buf, int len)
456	elmex	1.1	{
457	root	1.14	packet sl;
458	elmex	1.1
459	root	1.13	sl << data (buf, len);
460			send_packet (sl);
461	elmex	1.1	}
462
463	root	1.13	void
464	root	1.22	client::send_packet (const char *buf)
465	root	1.13	{
466			send_packet (buf, strlen (buf));
467			}
468	elmex	1.1
469	root	1.23	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	root	1.40	void
483			client::send_msg (int color, const char type, const char msg)
484			{
485	root	1.58	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	root	1.59	int len = strlen (msg);
492
493	root	1.66	if (!(color & NDI_VERBATIM)
494			&& (msg_is_special (msg)
495			\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
496	root	1.48	cfperl_send_msg (this, color, type, msg);
497	root	1.69	else
498	root	1.53	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
499	root	1.40	}
500
501	root	1.48	void
502			client::send_drawinfo (const char *msg, int flags)
503			{
504			send_msg (flags, "log", msg);
505			}
506
507	root	1.23	/***********************************************************************
508			*
509			* packet functions/utilities
510			*
511			**********************************************************************/
512
513	root	1.27	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	root	1.37	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	root	1.38	*--p = val & 0x7F;
530
531	root	1.37	while (val > 0x7F)
532			{
533	root	1.38	val >>= 7;
534	root	1.37	*--p = (val & 0x7F) \| 0x80;
535			}
536
537			return *this << data (p, buf + maxlen - p);
538			}
539
540	root	1.23	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