server/socket/lowlevel.C

/*
    CrossFire, A Multiplayer game for X-windows

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

#ifdef __linux__
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# define TCP_HZ 1000            // sorry...
# 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
#define SOCKET_TIMEOUT2 20

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

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

      if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL   // ack delayed for 20s
          && SOCKET_TIMEOUT2 * TCP_HZ < 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", ns->fd,
               (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
          ns->status = Ns_Dead;
        }
    }

  int val;

  val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
  val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
#endif
}

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

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::printf (const char *format, ...)
{
  int size = room ();

  va_list ap;
  va_start (ap, format);
  int len = vsnprintf ((char *)cur, size, format, ap);
  va_end (ap);

  if (len >= size)
    return reset ();

  cur += len;
}

/******************************************************************************
 *
 * Start of read routines.
 *
 ******************************************************************************/

int
client_socket::read_packet ()
{
  for (;;)
    {
      if (inbuf_len >= 2)
        {
          unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];

          if (inbuf_len >= 2 + pkt_len)
            return  pkt_len + 2;
        }

      int amount = sizeof (inbuf) - inbuf_len;

      if (amount <= 0)
        {
          LOG (llevError, "packet too large");//TODO
          return -1;
        }

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

      if (!amount)
        {
          status = Ns_Dead;
          return -1;
        }
      else if (amount < 0)
        {
          if (errno != EAGAIN && errno != EINTR)
            {
              LOG (llevError, "read error: %s", strerror (errno));
              return -1;
            }

          return 0;
        }

      inbuf_len += amount;

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

void
client_socket::skip_packet (int len)
{
  inbuf_len -= len;
  memmove (inbuf, inbuf + len, inbuf_len);
}

/*******************************************************************************
 *
 * 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.
 */

static void
add_to_buffer (client_socket *ns, char *buf, int len)
{
  int avail, end;

  if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
    {
      LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
      ns->status = Ns_Dead;
      return;
    }

  /* data + end is where we start putting the new data.  The last byte
   * currently in use is actually data + end -1
   */

  end = ns->outputbuffer.start + ns->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 (ns->outputbuffer.data + end, buf, len);
  else
    {
      memcpy (ns->outputbuffer.data + end, buf, avail);
      memcpy (ns->outputbuffer.data, buf + avail, len - avail);
    }

  ns->outputbuffer.len += len;
#if 0
  LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
#endif
}

/**
 * Writes data to socket.
 *
 * When the socket is clear to write, and we have backlogged data, this
 * is called to write it out.
 */
void
write_socket_buffer (client_socket * ns)
{
  int amt, max;

  if (ns->outputbuffer.len == 0)
    {
      LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
      return;
    }

  do
    {
      max = SOCKETBUFSIZE - ns->outputbuffer.start;
      if (ns->outputbuffer.len < max)
        max = ns->outputbuffer.len;

      do
        {
          amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
        }
      while ((amt < 0) && (errno == EINTR));

      if (amt < 0)
        {                       /* We got an error */

          if (errno != EWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
              ns->status = Ns_Dead;
              return;
            }
          else
            {                   /* EWOULDBLOCK */
              /* can't write it, so store it away. */
              ns->can_write = 0;
              return;
            }
        }
      ns->outputbuffer.start += amt;
      /* wrap back to start of buffer */
      if (ns->outputbuffer.start == SOCKETBUFSIZE)
        ns->outputbuffer.start = 0;
      ns->outputbuffer.len -= amt;
#ifdef CS_LOGSTATS
      cst_tot.obytes += amt;
      cst_lst.obytes += amt;
#endif
    }
  while (ns->outputbuffer.len > 0);
}

/**
 * This writes data to the socket. - It is very low level -
 * all we try and do is write out the data to the socket
 * provided (ns).  buf is the data to write, len is the number
 * of bytes to write.  IT doesn't return anything - rather, it
 * updates the ns structure if we get an  error.
 */
void
client_socket::send (void *buf_, int len)
{
  char *buf = (char *)buf_;
  char *pos = buf;
  int amt = 0;

  if (status == Ns_Dead || !buf)
    {
      LOG (llevDebug, "Write_To_Socket called with dead socket\n");
      return;
    }

#ifndef __GNU__                 /* This caused problems on Hurd */
  if (!can_write)
    {
      add_to_buffer (this, buf, len);
      return;
    }
#endif

  /* If we manage to write more than we wanted, take it as a bonus */
  while (len > 0)
    {
      do
        {
          amt = write (fd, pos, len);
        }
      while ((amt < 0) && (errno == EINTR));

      if (amt < 0)
        {                       /* We got an error */
          if (errno != EWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed WTS (%d: %s).\n",        /* ---WIN32 */
                   errno, strerror (errno));
              status = Ns_Dead;
              return;
            }
          else
            {                   /* EWOULDBLOCK */
              /* can't write it, so store it away. */
              add_to_buffer (this, pos, len);
              can_write = 0;
              return;
            }
        }
      /* amt gets set to 0 above in blocking code, so we do this as
       * an else if to make sure we don't reprocess it.
       */
      else if (amt == 0)
        LOG (llevError, "Write_To_Socket: No data written out.\n");

      len -= amt;
      pos += amt;
#ifdef CS_LOGSTATS
      cst_tot.obytes += amt;
      cst_lst.obytes += amt;
#endif
    }
}

/**
 * Takes a string of data, and writes it out to the socket. A very handy
 * shortcut function.
 */

void
client_socket::send_packet (packet &sl)
{
  Send_With_Handling (this, &sl);
}

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

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

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

/**
 * Calls Write_To_Socket to send data to the client.
 *
 * The only difference in this function is that we take a packet
 *, and we prepend the length information.
 */
void
Send_With_Handling (client_socket *ns, packet *msg)
{
  unsigned char sbuf[4];

  if (ns->status == Ns_Dead || !msg)
    return;

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

  sbuf[0] = ((uint32) (msg->length ()) >> 8);
  sbuf[1] = ((uint32) (msg->length ())     );

  if (ns->status != Ns_Old)
    ns->send (sbuf, 2);

  ns->send (msg->buf, msg->length ());
}

/******************************************************************************
 *
 * 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:	1.17
Committed:	Thu Dec 14 04:30:33 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+0 -1 lines
Log Message:	- rewrote most of the socket loop code - moved connection accept into tcp.ext - no evil socket copying anymore, needs more cleanups
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 1992 Frank Tore Johansen
5
6			This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10
11			This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15
16			You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20			The author can be reached via e-mail to mark@pyramid.com
21			*/
22
23			/**
24			* \file
25			* Low-level socket-related functions.
26			*
27			* \date 2003-12-02
28			*
29			* Contains some base functions that both the client and server
30			* can use. As such, depending what we are being compiled for will
31			* determine what we can include. the client is designed have
32			* CFCLIENT defined as part of its compile flags.
33			*/
34
35			using namespace std;
36
37			#include <global.h>
38			#include <newclient.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	root	1.5	# define TCP_HZ 1000 // sorry...
47	elmex	1.1	# include <netinet/tcp.h>
48			#endif
49
50			// use a really low timeout, as it doesn't cost any bandwidth, and you can
51			// easily die in 20 seconds...
52			#define SOCKET_TIMEOUT1 10
53			#define SOCKET_TIMEOUT2 20
54
55	root	1.5	void
56	root	1.16	Socket_Flush (client_socket * ns)
57	elmex	1.1	{
58			#ifdef __linux__
59			// check time of last ack, and, if too old, kill connection
60			struct tcp_info tcpi;
61			socklen_t len = sizeof (tcpi);
62
63			if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64			{
65			unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66
67	root	1.5	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
68			&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
69	elmex	1.1	{
70	root	1.3	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
71	root	1.5	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72	elmex	1.1	ns->status = Ns_Dead;
73			}
74			}
75
76			int val;
77	root	1.5
78	root	1.9	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79			val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
80	elmex	1.1	#endif
81			}
82
83			/***********************************************************************
84			*
85	root	1.14	* packet functions/utilities
86	elmex	1.1	*
87			**********************************************************************/
88
89	root	1.14	packet &packet::operator <<(const data &v)
90	elmex	1.1	{
91	root	1.15	if (room () < v.len)
92			reset ();
93			else
94	root	1.11	{
95	root	1.15	if (v.len)
96			{
97			memcpy (cur, v.ptr, v.len);
98			cur += v.len;
99			}
100	root	1.11	}
101	root	1.9
102	root	1.11	return *this;
103			}
104	root	1.9
105	root	1.14	packet &packet::operator <<(const data8 &v)
106	root	1.11	{
107			unsigned int len = min (v.len, 0x00FF);
108			return *this << uint8 (len) << data (v.ptr, len);
109	elmex	1.1	}
110
111	root	1.14	packet &packet::operator <<(const data16 &v)
112	elmex	1.1	{
113	root	1.11	unsigned int len = min (v.len, 0xFFFF);
114			return *this << uint16 (len) << data (v.ptr, len);
115			}
116	root	1.9
117	root	1.14	packet &packet::operator <<(const char *v)
118	root	1.11	{
119			return *this << data (v, strlen (v ? v : 0));
120	elmex	1.1	}
121
122	root	1.11	void
123	root	1.14	packet::printf (const char *format, ...)
124	root	1.10	{
125	root	1.15	int size = room ();
126
127	root	1.11	va_list ap;
128			va_start (ap, format);
129	root	1.15	int len = vsnprintf ((char *)cur, size, format, ap);
130			va_end (ap);
131	root	1.11
132	root	1.15	if (len >= size)
133			return reset ();
134	root	1.10
135	root	1.15	cur += len;
136	root	1.10	}
137
138	elmex	1.1	/******************************************************************************
139			*
140			* Start of read routines.
141			*
142			******************************************************************************/
143
144	root	1.5	int
145	root	1.16	client_socket::read_packet ()
146	elmex	1.1	{
147	root	1.12	for (;;)
148	root	1.5	{
149	root	1.12	if (inbuf_len >= 2)
150	root	1.5	{
151	root	1.12	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];
152
153			if (inbuf_len >= 2 + pkt_len)
154			return pkt_len + 2;
155	root	1.5	}
156	pippijn	1.8
157	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
158
159			if (amount <= 0)
160	root	1.5	{
161	root	1.12	LOG (llevError, "packet too large");//TODO
162			return -1;
163	root	1.3	}
164	elmex	1.1
165	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
166
167			if (!amount)
168	root	1.5	{
169	root	1.12	status = Ns_Dead;
170			return -1;
171	root	1.5	}
172	root	1.12	else if (amount < 0)
173	root	1.5	{
174	root	1.12	if (errno != EAGAIN && errno != EINTR)
175	root	1.5	{
176	root	1.12	LOG (llevError, "read error: %s", strerror (errno));
177			return -1;
178	root	1.3	}
179	root	1.12
180			return 0;
181	root	1.3	}
182	root	1.12
183			inbuf_len += amount;
184
185			cst_tot.ibytes += amount;
186			cst_lst.ibytes += amount;
187	root	1.5	}
188	root	1.12	}
189
190			void
191	root	1.16	client_socket::skip_packet (int len)
192	root	1.12	{
193			inbuf_len -= len;
194			memmove (inbuf, inbuf + len, inbuf_len);
195	elmex	1.1	}
196
197			/*******************************************************************************
198			*
199			* Start of write related routines.
200			*
201			******************************************************************************/
202
203			/**
204			* Adds data to a socket buffer for whatever reason.
205			*
206			* ns is the socket we are adding the data to, buf is the start of the
207			* data, and len is the number of bytes to add.
208			*/
209
210	root	1.5	static void
211	root	1.16	add_to_buffer (client_socket ns, char buf, int len)
212	elmex	1.1	{
213	root	1.5	int avail, end;
214	elmex	1.1
215	root	1.5	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216			{
217			LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218			ns->status = Ns_Dead;
219			return;
220			}
221
222			/* data + end is where we start putting the new data. The last byte
223			* currently in use is actually data + end -1
224			*/
225
226			end = ns->outputbuffer.start + ns->outputbuffer.len;
227			/* The buffer is already in a wrapped state, so adjust end */
228			if (end >= SOCKETBUFSIZE)
229			end -= SOCKETBUFSIZE;
230	root	1.7
231	root	1.5	avail = SOCKETBUFSIZE - end;
232	elmex	1.1
233	root	1.5	/* We can all fit it behind the current data without wrapping */
234			if (avail >= len)
235	root	1.7	memcpy (ns->outputbuffer.data + end, buf, len);
236	root	1.5	else
237			{
238			memcpy (ns->outputbuffer.data + end, buf, avail);
239			memcpy (ns->outputbuffer.data, buf + avail, len - avail);
240	elmex	1.1	}
241	root	1.7
242	root	1.5	ns->outputbuffer.len += len;
243	elmex	1.1	#if 0
244	root	1.5	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245	elmex	1.1	#endif
246			}
247
248			/**
249			* Writes data to socket.
250			*
251			* When the socket is clear to write, and we have backlogged data, this
252			* is called to write it out.
253			*/
254	root	1.5	void
255	root	1.16	write_socket_buffer (client_socket * ns)
256	elmex	1.1	{
257	root	1.5	int amt, max;
258	elmex	1.1
259	root	1.5	if (ns->outputbuffer.len == 0)
260			{
261			LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262			return;
263	elmex	1.1	}
264
265	root	1.5	do
266			{
267			max = SOCKETBUFSIZE - ns->outputbuffer.start;
268			if (ns->outputbuffer.len < max)
269			max = ns->outputbuffer.len;
270	elmex	1.1
271	root	1.5	do
272			{
273			amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274			}
275			while ((amt < 0) && (errno == EINTR));
276	elmex	1.1
277	root	1.5	if (amt < 0)
278			{ /* We got an error */
279	elmex	1.1
280	root	1.5	if (errno != EWOULDBLOCK)
281			{
282			LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283			ns->status = Ns_Dead;
284			return;
285	root	1.3	}
286	root	1.5	else
287			{ /* EWOULDBLOCK */
288			/* can't write it, so store it away. */
289			ns->can_write = 0;
290			return;
291	root	1.3	}
292			}
293	root	1.5	ns->outputbuffer.start += amt;
294			/* wrap back to start of buffer */
295			if (ns->outputbuffer.start == SOCKETBUFSIZE)
296			ns->outputbuffer.start = 0;
297			ns->outputbuffer.len -= amt;
298	elmex	1.1	#ifdef CS_LOGSTATS
299	root	1.5	cst_tot.obytes += amt;
300			cst_lst.obytes += amt;
301			#endif
302			}
303			while (ns->outputbuffer.len > 0);
304	elmex	1.1	}
305
306			/**
307			* This writes data to the socket. - It is very low level -
308			* all we try and do is write out the data to the socket
309			* provided (ns). buf is the data to write, len is the number
310			* of bytes to write. IT doesn't return anything - rather, it
311			* updates the ns structure if we get an error.
312			*/
313	root	1.5	void
314	root	1.16	client_socket::send (void *buf_, int len)
315	elmex	1.1	{
316	root	1.15	char buf = (char )buf_;
317			char *pos = buf;
318	root	1.5	int amt = 0;
319	elmex	1.1
320	root	1.15	if (status == Ns_Dead \|\| !buf)
321	root	1.5	{
322			LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323			return;
324	elmex	1.1	}
325	root	1.5
326			#ifndef __GNU__ /* This caused problems on Hurd */
327	root	1.15	if (!can_write)
328	root	1.5	{
329	root	1.15	add_to_buffer (this, buf, len);
330	root	1.5	return;
331	elmex	1.1	}
332			#endif
333	root	1.15
334	root	1.5	/* If we manage to write more than we wanted, take it as a bonus */
335			while (len > 0)
336			{
337			do
338			{
339	root	1.15	amt = write (fd, pos, len);
340	root	1.5	}
341			while ((amt < 0) && (errno == EINTR));
342	elmex	1.1
343	root	1.5	if (amt < 0)
344			{ /* We got an error */
345			if (errno != EWOULDBLOCK)
346			{
347			LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348			errno, strerror (errno));
349	root	1.15	status = Ns_Dead;
350	root	1.5	return;
351	root	1.3	}
352	root	1.5	else
353			{ /* EWOULDBLOCK */
354			/* can't write it, so store it away. */
355	root	1.15	add_to_buffer (this, pos, len);
356			can_write = 0;
357	root	1.5	return;
358	root	1.3	}
359			}
360	root	1.5	/* amt gets set to 0 above in blocking code, so we do this as
361			* an else if to make sure we don't reprocess it.
362			*/
363			else if (amt == 0)
364	root	1.15	LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366	root	1.5	len -= amt;
367			pos += amt;
368	elmex	1.1	#ifdef CS_LOGSTATS
369	root	1.5	cst_tot.obytes += amt;
370			cst_lst.obytes += amt;
371			#endif
372	elmex	1.1	}
373			}
374
375			/**
376			* Takes a string of data, and writes it out to the socket. A very handy
377			* shortcut function.
378			*/
379	root	1.13
380			void
381	root	1.16	client_socket::send_packet (packet &sl)
382	root	1.13	{
383			Send_With_Handling (this, &sl);
384			}
385
386	root	1.5	void
387	root	1.16	client_socket::send_packet (const char *buf, int len)
388	elmex	1.1	{
389	root	1.14	packet sl;
390	elmex	1.1
391	root	1.13	sl << data (buf, len);
392			send_packet (sl);
393	elmex	1.1	}
394
395	root	1.13	void
396	root	1.16	client_socket::send_packet (const char *buf)
397	root	1.13	{
398			send_packet (buf, strlen (buf));
399			}
400	elmex	1.1
401			/**
402			* Calls Write_To_Socket to send data to the client.
403			*
404	root	1.14	* The only difference in this function is that we take a packet
405	elmex	1.1	*, and we prepend the length information.
406			*/
407	root	1.5	void
408	root	1.16	Send_With_Handling (client_socket ns, packet msg)
409	elmex	1.1	{
410	root	1.5	unsigned char sbuf[4];
411	elmex	1.1
412	root	1.5	if (ns->status == Ns_Dead \|\| !msg)
413			return;
414	elmex	1.1
415	root	1.15	if (msg->length () >= MAXSOCKBUF)
416	root	1.5	{
417	root	1.15	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ());
418	root	1.5	/* Almost certainly we've overflowed a buffer, so quite now to make
419			* it easier to debug.
420			*/
421			abort ();
422			}
423	root	1.15
424			sbuf[0] = ((uint32) (msg->length ()) >> 8);
425			sbuf[1] = ((uint32) (msg->length ()) );
426
427	root	1.5	if (ns->status != Ns_Old)
428	root	1.15	ns->send (sbuf, 2);
429
430			ns->send (msg->buf, msg->length ());
431	elmex	1.1	}
432
433			/******************************************************************************
434			*
435			* statistics logging functions.
436			*
437			******************************************************************************/
438
439			#ifdef CS_LOGSTATS
440	root	1.5
441	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
442			* stats
443			*/
444			CS_Stats cst_tot, cst_lst;
445
446			/**
447			* Writes out the gathered stats. We clear cst_lst.
448			*/
449	root	1.5	void
450			write_cs_stats (void)
451	elmex	1.1	{
452	root	1.5	time_t now = time (NULL);
453	elmex	1.1
454	root	1.5	/* If no connections recently, don't both to log anything */
455			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
456			return;
457
458			/* CSSTAT is put in so scripts can easily find the line */
459			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
460			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
461			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
462			cst_lst.ibytes = 0;
463			cst_lst.obytes = 0;
464			cst_lst.time_start = now;
465	elmex	1.1	}
466			#endif
467	root	1.9