server/socket/lowlevel.C

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program 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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to mark@pyramid.com
*/

/**
 * \file
 * Low-level socket-related functions.
 *
 * \date 2003-12-02
 *
 * Contains some base functions that both the client and server
 * can use.  As such, depending what we are being compiled for will
 * determine what we can include.  the client is designed have
 * CFCLIENT defined as part of its compile flags.
 */

using namespace std;

#include <global.h>
#include <sproto.h>
#include <cstdarg>

#ifdef __linux__
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
#endif

// use a really low timeout, as it doesn't cost any bandwidth, and you can
// easily die in 20 seconds...
#define SOCKET_TIMEOUT1 10 * 1000
#define SOCKET_TIMEOUT2 20 * 1000

void
client::flush ()
{
  if (destroyed ())
    return;

#ifdef __linux__
  // check time of last ack, and, if too old, kill connection
  struct tcp_info tcpi;
  socklen_t len = sizeof (tcpi);

  if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
    {
      unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;

      rtt    = tcpi.tcpi_rtt;
      rttvar = tcpi.tcpi_rttvar;

      if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL   // ack delayed for 20s
          && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent)       // no data sent for 10s
        {
          LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
               (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
          destroy ();
        }
    }
#endif

  /**
   * Writes data to socket.
   *
   * When the socket is clear to write, and we have backlogged data, this
   * is called to write it out.
   */

  if (!outputbuffer.len || socket_ev.poll () & PE_W)
    return;

  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;
#ifdef CS_LOGSTATS
          cst_tot.obytes += res;
          cst_lst.obytes += res;
#endif
        }
      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 () | PE_W);
          socket_ev.start ();
          return;
        }
      else
        {
          LOG (llevError, "socket write failed: %s\n", strerror (errno));
          destroy ();
          return;
        }
    }

  socket_ev.poll (socket_ev.poll () & ~PE_W);
}

/******************************************************************************
 *
 * 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);
          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 },
  {"command",     PC(PlayerCmd)    PF_PLAYING },

  {"examine",     PC(ExamineCmd)   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 },       /* Added: phil */
  {"mapinfo",     PC(MapInfoCmd)   0 },   /* CF+ */

  {"reply",       SC(ReplyCmd)     0 },
  {"exti",        SC(ExtiCmd)      0 }, /* CF+ */
  {"addme",       SC(AddMeCmd)     0 },
  {"askface",     SC(SendFaceCmd)  0 },     /* Added: phil */
  {"requestinfo", SC(RequestInfo)  0 },
  {"setfacemode", SC(SetFaceMode)  0 },
  {"setsound",    SC(SetSound)     0 },
  {"setup",       SC(SetUp)        0 },
  {"version",     SC(VersionCmd)   0 },
  {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
  {"toggleextendedtext",  SC(ToggleExtendedText)  0 },   /*Added: tchize */
  {"asksmooth",   SC(AskSmooth)    0 },     /*Added: tchize (smoothing technologies) */
};

bool
client::may_execute (const packet_type *pkt) const
{
  return (!(pkt->flags & PF_PLAYER)  || pl)
      && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
}

void
client::execute (const packet_type *pkt, char *data, int datalen)
{
  if (may_execute (pkt))
    {
      //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, 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)
          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, (char *)inbuf + 2);
next_packet:
  skip_packet (pkt_len);

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

  return true;
}

// callback called when socket is either readable or writable
void
client::socket_cb (iow &w, int got)
{
  //TODO remove when we have better socket cleanup logic
  if (destroyed ())
    {
      socket_ev.poll (0);
      return;
    }

  if (got & PE_W)
    {
      write_outputbuffer ();

      if (!outputbuffer.len)
        socket_ev.poll (socket_ev.poll () & ~PE_W);
    }

  if (got & PE_R)
    {
      //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 () & ~PE_R);
          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;

          cst_tot.ibytes += amount;
          cst_lst.ibytes += amount;

          cmd_ev.start ();
        }
    }
}

// called whenever we have additional commands to process
void
client::cmd_cb (iw &w)
{
  if (handle_packet ())
    w.start ();
  else
    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_;
  char *pos = buf;
  int amt = 0;

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

  if (len + outputbuffer.len > SOCKETBUFSIZE)
    {
      LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
      destroy ();
      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);
}

/***********************************************************************
 *
 * packet functions/utilities
 *
 **********************************************************************/

packet::packet (const char *name)
{
  reset ();

  int len = strlen (name);
  memcpy (cur, name, len); cur += len;
  *cur++ = ' ';
}

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;
}

/******************************************************************************
 *
 * statistics logging functions.
 *
 ******************************************************************************/

#ifdef CS_LOGSTATS

/* cst_tot is for the life of the server, cst_last is for the last series of
 * stats
 */
CS_Stats cst_tot, cst_lst;

/**
 * Writes out the gathered stats.  We clear cst_lst.
 */
void
write_cs_stats (void)
{
  time_t now = time (NULL);

  /* If no connections recently, don't both to log anything */
  if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
    return;

  /* CSSTAT is put in so scripts can easily find the line */
  LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
       ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
       now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
  cst_lst.ibytes = 0;
  cst_lst.obytes = 0;
  cst_lst.time_start = now;
}
#endif

Revision:	1.31
Committed:	Mon Jan 15 02:39:41 2007 UTC (17 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.30:	+1 -1 lines
Log Message:	- fix crash bug - better fork & abort (untested)
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4	pippijn	1.30	Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5	elmex	1.1	Copyright (C) 1992 Frank Tore Johansen
6
7			This program 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 2 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, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21			The author can be reached via e-mail to mark@pyramid.com
22			*/
23
24			/**
25			* \file
26			* Low-level socket-related functions.
27			*
28			* \date 2003-12-02
29			*
30			* Contains some base functions that both the client and server
31			* can use. As such, depending what we are being compiled for will
32			* determine what we can include. the client is designed have
33			* CFCLIENT defined as part of its compile flags.
34			*/
35
36			using namespace std;
37
38			#include <global.h>
39			#include <sproto.h>
40	root	1.11	#include <cstdarg>
41	elmex	1.1
42			#ifdef __linux__
43			# include <sys/types.h>
44			# include <sys/socket.h>
45			# include <netinet/in.h>
46			# include <netinet/tcp.h>
47			#endif
48
49			// use a really low timeout, as it doesn't cost any bandwidth, and you can
50			// easily die in 20 seconds...
51	root	1.26	#define SOCKET_TIMEOUT1 10 * 1000
52			#define SOCKET_TIMEOUT2 20 * 1000
53	elmex	1.1
54	root	1.5	void
55	root	1.22	client::flush ()
56	elmex	1.1	{
57	root	1.29	if (destroyed ())
58			return;
59
60	elmex	1.1	#ifdef __linux__
61			// check time of last ack, and, if too old, kill connection
62			struct tcp_info tcpi;
63			socklen_t len = sizeof (tcpi);
64
65	root	1.20	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
66	elmex	1.1	{
67			unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
68
69	root	1.21	rtt = tcpi.tcpi_rtt;
70			rttvar = tcpi.tcpi_rttvar;
71
72	root	1.26	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
73			&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74	elmex	1.1	{
75	root	1.20	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
76	root	1.5	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77	root	1.23	destroy ();
78	elmex	1.1	}
79			}
80	root	1.20	#endif
81
82			/**
83			* Writes data to socket.
84			*
85			* When the socket is clear to write, and we have backlogged data, this
86			* is called to write it out.
87			*/
88
89			if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)
90			return;
91
92			write_outputbuffer ();
93			}
94	elmex	1.1
95	root	1.20	void
96	root	1.22	client::write_outputbuffer ()
97	root	1.20	{
98			while (outputbuffer.len)
99			{
100			int res = write (fd, outputbuffer.data + outputbuffer.start,
101			min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
102	root	1.5
103	root	1.20	if (res > 0)
104			{
105			outputbuffer.start += res;
106			/* wrap back to start of buffer */
107			if (outputbuffer.start == SOCKETBUFSIZE)
108			outputbuffer.start = 0;
109
110			outputbuffer.len -= res;
111			#ifdef CS_LOGSTATS
112			cst_tot.obytes += res;
113			cst_lst.obytes += res;
114	elmex	1.1	#endif
115	root	1.20	}
116			else if (res == 0)
117			{
118			LOG (llevError, "socket write failed, connection closed.\n");
119	root	1.23	destroy ();
120	root	1.20	return;
121			}
122			else if (errno == EINTR)
123			{
124			// just retry
125			}
126			else if (errno == EAGAIN)
127			{
128			// delay till ready
129			socket_ev.poll (socket_ev.poll () \| PE_W);
130			socket_ev.start ();
131			return;
132			}
133			else
134			{
135			LOG (llevError, "socket write failed: %s\n", strerror (errno));
136	root	1.23	destroy ();
137	root	1.20	return;
138			}
139			}
140
141			socket_ev.poll (socket_ev.poll () & ~PE_W);
142	elmex	1.1	}
143
144	root	1.23	/******************************************************************************
145	elmex	1.1	*
146	root	1.23	* Start of read routines.
147	elmex	1.1	*
148	root	1.23	******************************************************************************/
149	elmex	1.1
150	root	1.23	int
151			client::next_packet ()
152	elmex	1.1	{
153	root	1.23	if (inbuf_len >= 2)
154	root	1.11	{
155	root	1.23	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
156
157			if (inbuf_len >= 2 + pkt_len)
158			return 2 + pkt_len;
159
160			if (inbuf_len == sizeof (inbuf))
161	root	1.15	{
162	root	1.23	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
163			destroy ();
164			return -1;
165	root	1.15	}
166	root	1.11	}
167	root	1.9
168	root	1.23	return 0;
169	root	1.11	}
170	root	1.9
171	root	1.23	void
172			client::skip_packet (int len)
173	root	1.11	{
174	root	1.23	inbuf_len -= len;
175			memmove (inbuf, inbuf + len, inbuf_len);
176	elmex	1.1	}
177
178	root	1.23	/*****************************************************************************
179			* Start of command dispatch area.
180			* The commands here are protocol commands.
181			****************************************************************************/
182
183			// SocketCommand, PlayingCommand, should not exist with those ugly casts
184			#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
185			#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
186
187			/**
188			* Dispatch table for the server.
189			*/
190			static struct packet_type packets[] = {
191			{"ncom", PC(NewPlayerCmd) PF_PLAYING },
192			{"command", PC(PlayerCmd) PF_PLAYING },
193
194			{"examine", PC(ExamineCmd) PF_PLAYING },
195			{"apply", PC(ApplyCmd) PF_PLAYING },
196			{"lookat", PC(LookAt) PF_PLAYING },
197			{"lock", PC(LockItem) PF_PLAYING },
198			{"mark", PC(MarkItem) PF_PLAYING },
199			{"move", PC(MoveCmd) PF_PLAYING },
200			{"ext", PC(ExtCmd) 0 }, /* CF+ */
201	root	1.26	{"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
202	root	1.23	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
203
204	root	1.28	{"reply", SC(ReplyCmd) 0 },
205	root	1.26	{"exti", SC(ExtiCmd) 0 }, /* CF+ */
206			{"addme", SC(AddMeCmd) 0 },
207			{"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
208			{"requestinfo", SC(RequestInfo) 0 },
209			{"setfacemode", SC(SetFaceMode) 0 },
210			{"setsound", SC(SetSound) 0 },
211			{"setup", SC(SetUp) 0 },
212			{"version", SC(VersionCmd) 0 },
213			{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
214			{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
215			{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
216	root	1.23	};
217
218			bool
219			client::may_execute (const packet_type *pkt) const
220	elmex	1.1	{
221	root	1.23	return (!(pkt->flags & PF_PLAYER) \|\| pl)
222	root	1.29	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
223	root	1.11	}
224	root	1.9
225	root	1.23	void
226			client::execute (const packet_type pkt, char data, int datalen)
227	root	1.11	{
228	root	1.23	if (may_execute (pkt))
229			{
230			//TODO: only one format
231			if (pkt->flags & PF_PLAYER)
232			((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
233			else
234			((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
235			}
236			else
237			send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
238	elmex	1.1	}
239
240	root	1.23	bool
241			client::handle_packet ()
242	root	1.10	{
243	root	1.23	int pkt_len = next_packet ();
244
245			if (!pkt_len)
246			return false;
247			else if (pkt_len < 0)
248			{
249			LOG (llevError, "read error on player %s\n",
250			pl && pl->ob ? &pl->ob->name : "[anonymous]");
251			destroy ();
252			return false;
253			}
254
255			inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
256
257			/* First, break out beginning word. There are at least
258			* a few commands that do not have any paremeters. If
259			* we get such a command, don't worry about trying
260			* to break it up.
261			*/
262			int datalen;
263			char data = strchr ((char )inbuf + 2, ' ');
264
265			if (data)
266			{
267			*data++ = 0;
268			datalen = pkt_len - (data - (char *)inbuf);
269			}
270			else
271			{
272			data = (char *)inbuf + 2; // better read garbage than segfault
273			datalen = 0;
274			}
275	root	1.15
276	root	1.23	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
277			if (!strcmp ((char *)inbuf + 2, pkt->name))
278			{
279	root	1.26	if (pkt->flags & PF_PLAYER)
280			queue_command (pkt, data, datalen);
281			else
282	root	1.23	execute (pkt, data, datalen);
283
284			goto next_packet;
285			}
286
287	root	1.26	// If we get here, we didn't find a valid command.
288	root	1.23	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289			next_packet:
290			skip_packet (pkt_len);
291	root	1.11
292	root	1.23	// input buffer has space again
293			socket_ev.poll (socket_ev.poll () \| PE_R);
294	root	1.10
295	root	1.23	return true;
296	root	1.10	}
297
298	root	1.23	// callback called when socket is either readable or writable
299			void
300			client::socket_cb (iow &w, int got)
301			{
302			//TODO remove when we have better socket cleanup logic
303	root	1.29	if (destroyed ())
304	root	1.23	{
305			socket_ev.poll (0);
306			return;
307			}
308	elmex	1.1
309	root	1.23	if (got & PE_W)
310	root	1.5	{
311	root	1.23	write_outputbuffer ();
312
313			if (!outputbuffer.len)
314			socket_ev.poll (socket_ev.poll () & ~PE_W);
315			}
316	root	1.12
317	root	1.23	if (got & PE_R)
318			{
319			//TODO: rate-limit tcp connection in better ways, important
320	pippijn	1.8
321	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
322
323	root	1.23	if (!amount)
324	root	1.5	{
325	root	1.23	// input buffer full
326			socket_ev.poll (socket_ev.poll () & ~PE_R);
327			return;
328	root	1.3	}
329	elmex	1.1
330	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
331
332			if (!amount)
333	root	1.5	{
334	root	1.23	destroy ();
335			return;
336	root	1.5	}
337	root	1.12	else if (amount < 0)
338	root	1.5	{
339	root	1.12	if (errno != EAGAIN && errno != EINTR)
340	root	1.5	{
341	root	1.20	LOG (llevError, "read error: %s\n", strerror (errno));
342	root	1.23	destroy ();
343			return;
344	root	1.3	}
345	root	1.12
346	root	1.23	// should not be here, normally
347	root	1.3	}
348	root	1.23	else
349			{
350			inbuf_len += amount;
351	root	1.12
352	root	1.23	cst_tot.ibytes += amount;
353			cst_lst.ibytes += amount;
354	root	1.12
355	root	1.23	cmd_ev.start ();
356			}
357	root	1.5	}
358	root	1.12	}
359
360	root	1.23	// called whenever we have additional commands to process
361	root	1.12	void
362	root	1.23	client::cmd_cb (iw &w)
363	root	1.12	{
364	root	1.26	if (handle_packet ())
365	root	1.23	w.start ();
366			else
367			flush ();
368	elmex	1.1	}
369
370			/*******************************************************************************
371			*
372			* Start of write related routines.
373			*
374			******************************************************************************/
375
376			/**
377			* Adds data to a socket buffer for whatever reason.
378			*
379			* ns is the socket we are adding the data to, buf is the start of the
380			* data, and len is the number of bytes to add.
381			*/
382	root	1.20	void
383	root	1.22	client::send (void *buf_, int len)
384	root	1.20	{
385			char buf = (char )buf_;
386			char *pos = buf;
387			int amt = 0;
388	elmex	1.1
389	root	1.29	if (destroyed () \|\| !buf)
390	root	1.23	return;
391	elmex	1.1
392	root	1.31	if (len + outputbuffer.len > SOCKETBUFSIZE)
393	root	1.5	{
394	root	1.23	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395			destroy ();
396	root	1.5	return;
397			}
398
399	root	1.20	int avail, end;
400
401	root	1.5	/* data + end is where we start putting the new data. The last byte
402			* currently in use is actually data + end -1
403			*/
404	root	1.20	end = outputbuffer.start + outputbuffer.len;
405	root	1.5	/* The buffer is already in a wrapped state, so adjust end */
406			if (end >= SOCKETBUFSIZE)
407			end -= SOCKETBUFSIZE;
408	root	1.7
409	root	1.5	avail = SOCKETBUFSIZE - end;
410	elmex	1.1
411	root	1.5	/* We can all fit it behind the current data without wrapping */
412			if (avail >= len)
413	root	1.20	memcpy (outputbuffer.data + end, buf, len);
414	root	1.5	else
415			{
416	root	1.20	memcpy (outputbuffer.data + end, buf, avail);
417			memcpy (outputbuffer.data, buf + avail, len - avail);
418	elmex	1.1	}
419	root	1.7
420	root	1.20	outputbuffer.len += len;
421	elmex	1.1	}
422
423			/**
424			* Takes a string of data, and writes it out to the socket. A very handy
425			* shortcut function.
426			*/
427	root	1.13	void
428	root	1.22	client::send_packet (packet &sl)
429	root	1.13	{
430	root	1.29	if (destroyed ())
431	root	1.19	return;
432
433			if (sl.length () >= MAXSOCKBUF)
434			{
435			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
436			/* Almost certainly we've overflowed a buffer, so quit now to make
437			* it easier to debug.
438			*/
439			abort ();
440			}
441
442			if (!sl.length ())
443			return;
444
445			assert (sl.hdrlen == 2);
446
447			sl.buf_ [0] = sl.length () >> 8;
448			sl.buf_ [1] = sl.length () ;
449
450			send (sl.buf_, sl.length () + sl.hdrlen);
451	root	1.13	}
452
453	root	1.5	void
454	root	1.22	client::send_packet (const char *buf, int len)
455	elmex	1.1	{
456	root	1.14	packet sl;
457	elmex	1.1
458	root	1.13	sl << data (buf, len);
459			send_packet (sl);
460	elmex	1.1	}
461
462	root	1.13	void
463	root	1.22	client::send_packet (const char *buf)
464	root	1.13	{
465			send_packet (buf, strlen (buf));
466			}
467	elmex	1.1
468	root	1.23	void
469			client::send_packet_printf (const char *format, ...)
470			{
471			packet sl;
472
473			va_list ap;
474			va_start (ap, format);
475			sl.vprintf (format, ap);
476			va_end (ap);
477
478			send_packet (sl);
479			}
480
481			/***********************************************************************
482			*
483			* packet functions/utilities
484			*
485			**********************************************************************/
486
487	root	1.27	packet::packet (const char *name)
488			{
489			reset ();
490
491			int len = strlen (name);
492			memcpy (cur, name, len); cur += len;
493			*cur++ = ' ';
494			}
495
496	root	1.23	packet &packet::operator <<(const data &v)
497			{
498			if (room () < v.len)
499			reset ();
500			else
501			{
502			if (v.len)
503			{
504			memcpy (cur, v.ptr, v.len);
505			cur += v.len;
506			}
507			}
508
509			return *this;
510			}
511
512			packet &packet::operator <<(const data8 &v)
513			{
514			unsigned int len = min (v.len, 0x00FF);
515			return *this << uint8 (len) << data (v.ptr, len);
516			}
517
518			packet &packet::operator <<(const data16 &v)
519			{
520			unsigned int len = min (v.len, 0xFFFF);
521			return *this << uint16 (len) << data (v.ptr, len);
522			}
523
524			packet &packet::operator <<(const char *v)
525			{
526			return *this << data (v, strlen (v ? v : 0));
527			}
528
529			void
530			packet::vprintf (const char *format, va_list ap)
531			{
532			int size = room ();
533
534			int len = vsnprintf ((char *)cur, size, format, ap);
535
536			if (len >= size)
537			return reset ();
538
539			cur += len;
540			}
541
542	elmex	1.1	/******************************************************************************
543			*
544			* statistics logging functions.
545			*
546			******************************************************************************/
547
548			#ifdef CS_LOGSTATS
549	root	1.5
550	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
551			* stats
552			*/
553			CS_Stats cst_tot, cst_lst;
554
555			/**
556			* Writes out the gathered stats. We clear cst_lst.
557			*/
558	root	1.5	void
559			write_cs_stats (void)
560	elmex	1.1	{
561	root	1.5	time_t now = time (NULL);
562	elmex	1.1
563	root	1.5	/* If no connections recently, don't both to log anything */
564			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
565			return;
566
567			/* CSSTAT is put in so scripts can easily find the line */
568			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
569			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
570			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
571			cst_lst.ibytes = 0;
572			cst_lst.obytes = 0;
573			cst_lst.time_start = now;
574	elmex	1.1	}
575			#endif
576	root	1.9