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 (NewSocket * 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 (v.len)
    {
      memcpy (buf + len, v.ptr, v.len);
      len += 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, ...)
{
  va_list ap;
  va_start (ap, format);

  len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap);

  va_end (ap);
}

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

int
NewSocket::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
NewSocket::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 (NewSocket *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 (NewSocket * 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
Write_To_Socket (NewSocket * ns, char *buf, int len)
{
  int amt = 0;
  char *pos = buf;

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

#ifndef __GNU__                 /* This caused problems on Hurd */
  if (!ns->can_write)
    {
      add_to_buffer (ns, buf, len);
      return;
    }
#endif
  /* If we manage to write more than we wanted, take it as a bonus */
  while (len > 0)
    {

      do
        {
          amt = write (ns->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));
              ns->status = Ns_Dead;
              return;
            }
          else
            {                   /* EWOULDBLOCK */
              /* can't write it, so store it away. */
              add_to_buffer (ns, pos, len);
              ns->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
NewSocket::send_packet (packet &sl)
{
  Send_With_Handling (this, &sl);
}

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

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

void
NewSocket::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 (NewSocket *ns, packet *msg)
{
  unsigned char sbuf[4];

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

  if (msg->len >= MAXSOCKBUF)
    {
      LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);
      /* Almost certainly we've overflowed a buffer, so quite now to make
       * it easier to debug.
       */
      abort ();
    }
  sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
  sbuf[1] = ((uint32) (msg->len)) & 0xFF;
  if (ns->status != Ns_Old)
    Write_To_Socket (ns, (char *) sbuf, 2);
  Write_To_Socket (ns, (char *) msg->buf, msg->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.max_conn = socket_info.nconns;
  cst_lst.time_start = now;
}
#endif

Revision:	1.14
Committed:	Thu Dec 14 01:21:58 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+10 -11 lines
Log Message:	moar rewrite
#	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			Socket_Flush (NewSocket * 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	1.11	if (v.len)
92			{
93			memcpy (buf + len, v.ptr, v.len);
94			len += v.len;
95			}
96	root	1.9
97	root	1.11	return *this;
98			}
99	root	1.9
100	root	1.14	packet &packet::operator <<(const data8 &v)
101	root	1.11	{
102			unsigned int len = min (v.len, 0x00FF);
103			return *this << uint8 (len) << data (v.ptr, len);
104	elmex	1.1	}
105
106	root	1.14	packet &packet::operator <<(const data16 &v)
107	elmex	1.1	{
108	root	1.11	unsigned int len = min (v.len, 0xFFFF);
109			return *this << uint16 (len) << data (v.ptr, len);
110			}
111	root	1.9
112	root	1.14	packet &packet::operator <<(const char *v)
113	root	1.11	{
114			return *this << data (v, strlen (v ? v : 0));
115	elmex	1.1	}
116
117	root	1.11	void
118	root	1.14	packet::printf (const char *format, ...)
119	root	1.10	{
120	root	1.11	va_list ap;
121			va_start (ap, format);
122
123	root	1.13	len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap);
124	root	1.10
125	root	1.11	va_end (ap);
126	root	1.10	}
127
128	elmex	1.1	/******************************************************************************
129			*
130			* Start of read routines.
131			*
132			******************************************************************************/
133
134	root	1.5	int
135	root	1.12	NewSocket::read_packet ()
136	elmex	1.1	{
137	root	1.12	for (;;)
138	root	1.5	{
139	root	1.12	if (inbuf_len >= 2)
140	root	1.5	{
141	root	1.12	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];
142
143			if (inbuf_len >= 2 + pkt_len)
144			return pkt_len + 2;
145	root	1.5	}
146	pippijn	1.8
147	root	1.12	int amount = sizeof (inbuf) - inbuf_len;
148
149			if (amount <= 0)
150	root	1.5	{
151	root	1.12	LOG (llevError, "packet too large");//TODO
152			return -1;
153	root	1.3	}
154	elmex	1.1
155	root	1.12	amount = read (fd, inbuf + inbuf_len, amount);
156
157			if (!amount)
158	root	1.5	{
159	root	1.12	status = Ns_Dead;
160			return -1;
161	root	1.5	}
162	root	1.12	else if (amount < 0)
163	root	1.5	{
164	root	1.12	if (errno != EAGAIN && errno != EINTR)
165	root	1.5	{
166	root	1.12	LOG (llevError, "read error: %s", strerror (errno));
167			return -1;
168	root	1.3	}
169	root	1.12
170			return 0;
171	root	1.3	}
172	root	1.12
173			inbuf_len += amount;
174
175			cst_tot.ibytes += amount;
176			cst_lst.ibytes += amount;
177	root	1.5	}
178	root	1.12	}
179
180			void
181			NewSocket::skip_packet (int len)
182			{
183			inbuf_len -= len;
184			memmove (inbuf, inbuf + len, inbuf_len);
185	elmex	1.1	}
186
187			/*******************************************************************************
188			*
189			* Start of write related routines.
190			*
191			******************************************************************************/
192
193			/**
194			* Adds data to a socket buffer for whatever reason.
195			*
196			* ns is the socket we are adding the data to, buf is the start of the
197			* data, and len is the number of bytes to add.
198			*/
199
200	root	1.5	static void
201	root	1.12	add_to_buffer (NewSocket ns, char buf, int len)
202	elmex	1.1	{
203	root	1.5	int avail, end;
204	elmex	1.1
205	root	1.5	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
206			{
207			LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
208			ns->status = Ns_Dead;
209			return;
210			}
211
212			/* data + end is where we start putting the new data. The last byte
213			* currently in use is actually data + end -1
214			*/
215
216			end = ns->outputbuffer.start + ns->outputbuffer.len;
217			/* The buffer is already in a wrapped state, so adjust end */
218			if (end >= SOCKETBUFSIZE)
219			end -= SOCKETBUFSIZE;
220	root	1.7
221	root	1.5	avail = SOCKETBUFSIZE - end;
222	elmex	1.1
223	root	1.5	/* We can all fit it behind the current data without wrapping */
224			if (avail >= len)
225	root	1.7	memcpy (ns->outputbuffer.data + end, buf, len);
226	root	1.5	else
227			{
228			memcpy (ns->outputbuffer.data + end, buf, avail);
229			memcpy (ns->outputbuffer.data, buf + avail, len - avail);
230	elmex	1.1	}
231	root	1.7
232	root	1.5	ns->outputbuffer.len += len;
233	elmex	1.1	#if 0
234	root	1.5	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
235	elmex	1.1	#endif
236			}
237
238			/**
239			* Writes data to socket.
240			*
241			* When the socket is clear to write, and we have backlogged data, this
242			* is called to write it out.
243			*/
244	root	1.5	void
245			write_socket_buffer (NewSocket * ns)
246	elmex	1.1	{
247	root	1.5	int amt, max;
248	elmex	1.1
249	root	1.5	if (ns->outputbuffer.len == 0)
250			{
251			LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
252			return;
253	elmex	1.1	}
254
255	root	1.5	do
256			{
257			max = SOCKETBUFSIZE - ns->outputbuffer.start;
258			if (ns->outputbuffer.len < max)
259			max = ns->outputbuffer.len;
260	elmex	1.1
261	root	1.5	do
262			{
263			amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
264			}
265			while ((amt < 0) && (errno == EINTR));
266	elmex	1.1
267	root	1.5	if (amt < 0)
268			{ /* We got an error */
269	elmex	1.1
270	root	1.5	if (errno != EWOULDBLOCK)
271			{
272			LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
273			ns->status = Ns_Dead;
274			return;
275	root	1.3	}
276	root	1.5	else
277			{ /* EWOULDBLOCK */
278			/* can't write it, so store it away. */
279			ns->can_write = 0;
280			return;
281	root	1.3	}
282			}
283	root	1.5	ns->outputbuffer.start += amt;
284			/* wrap back to start of buffer */
285			if (ns->outputbuffer.start == SOCKETBUFSIZE)
286			ns->outputbuffer.start = 0;
287			ns->outputbuffer.len -= amt;
288	elmex	1.1	#ifdef CS_LOGSTATS
289	root	1.5	cst_tot.obytes += amt;
290			cst_lst.obytes += amt;
291			#endif
292			}
293			while (ns->outputbuffer.len > 0);
294	elmex	1.1	}
295
296			/**
297			* This writes data to the socket. - It is very low level -
298			* all we try and do is write out the data to the socket
299			* provided (ns). buf is the data to write, len is the number
300			* of bytes to write. IT doesn't return anything - rather, it
301			* updates the ns structure if we get an error.
302			*/
303	root	1.5	void
304			Write_To_Socket (NewSocket * ns, char *buf, int len)
305	elmex	1.1	{
306	root	1.5	int amt = 0;
307			char *pos = buf;
308	elmex	1.1
309	root	1.5	if (ns->status == Ns_Dead \|\| !buf)
310			{
311			LOG (llevDebug, "Write_To_Socket called with dead socket\n");
312			return;
313	elmex	1.1	}
314	root	1.5
315			#ifndef __GNU__ /* This caused problems on Hurd */
316			if (!ns->can_write)
317			{
318			add_to_buffer (ns, buf, len);
319			return;
320	elmex	1.1	}
321			#endif
322	root	1.5	/* If we manage to write more than we wanted, take it as a bonus */
323			while (len > 0)
324			{
325	elmex	1.1
326	root	1.5	do
327			{
328			amt = write (ns->fd, pos, len);
329			}
330			while ((amt < 0) && (errno == EINTR));
331	elmex	1.1
332	root	1.5	if (amt < 0)
333			{ /* We got an error */
334			if (errno != EWOULDBLOCK)
335			{
336			LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
337			errno, strerror (errno));
338			ns->status = Ns_Dead;
339			return;
340	root	1.3	}
341	root	1.5	else
342			{ /* EWOULDBLOCK */
343			/* can't write it, so store it away. */
344			add_to_buffer (ns, pos, len);
345			ns->can_write = 0;
346			return;
347	root	1.3	}
348			}
349	root	1.5	/* amt gets set to 0 above in blocking code, so we do this as
350			* an else if to make sure we don't reprocess it.
351			*/
352			else if (amt == 0)
353			{
354			LOG (llevError, "Write_To_Socket: No data written out.\n");
355	root	1.3	}
356	root	1.5	len -= amt;
357			pos += amt;
358	elmex	1.1	#ifdef CS_LOGSTATS
359	root	1.5	cst_tot.obytes += amt;
360			cst_lst.obytes += amt;
361			#endif
362	elmex	1.1	}
363			}
364
365			/**
366			* Takes a string of data, and writes it out to the socket. A very handy
367			* shortcut function.
368			*/
369	root	1.13
370			void
371	root	1.14	NewSocket::send_packet (packet &sl)
372	root	1.13	{
373			Send_With_Handling (this, &sl);
374			}
375
376	root	1.5	void
377	root	1.13	NewSocket::send_packet (const char *buf, int len)
378	elmex	1.1	{
379	root	1.14	packet sl;
380	elmex	1.1
381	root	1.13	sl << data (buf, len);
382			send_packet (sl);
383	elmex	1.1	}
384
385	root	1.13	void
386			NewSocket::send_packet (const char *buf)
387			{
388			send_packet (buf, strlen (buf));
389			}
390	elmex	1.1
391			/**
392			* Calls Write_To_Socket to send data to the client.
393			*
394	root	1.14	* The only difference in this function is that we take a packet
395	elmex	1.1	*, and we prepend the length information.
396			*/
397	root	1.5	void
398	root	1.14	Send_With_Handling (NewSocket ns, packet msg)
399	elmex	1.1	{
400	root	1.5	unsigned char sbuf[4];
401	elmex	1.1
402	root	1.5	if (ns->status == Ns_Dead \|\| !msg)
403			return;
404	elmex	1.1
405	root	1.5	if (msg->len >= MAXSOCKBUF)
406			{
407			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);
408			/* Almost certainly we've overflowed a buffer, so quite now to make
409			* it easier to debug.
410			*/
411			abort ();
412			}
413			sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
414			sbuf[1] = ((uint32) (msg->len)) & 0xFF;
415			if (ns->status != Ns_Old)
416			Write_To_Socket (ns, (char *) sbuf, 2);
417			Write_To_Socket (ns, (char *) msg->buf, msg->len);
418	elmex	1.1	}
419
420			/******************************************************************************
421			*
422			* statistics logging functions.
423			*
424			******************************************************************************/
425
426			#ifdef CS_LOGSTATS
427	root	1.5
428	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
429			* stats
430			*/
431			CS_Stats cst_tot, cst_lst;
432
433			/**
434			* Writes out the gathered stats. We clear cst_lst.
435			*/
436	root	1.5	void
437			write_cs_stats (void)
438	elmex	1.1	{
439	root	1.5	time_t now = time (NULL);
440	elmex	1.1
441	root	1.5	/* If no connections recently, don't both to log anything */
442			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
443			return;
444
445			/* CSSTAT is put in so scripts can easily find the line */
446			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
447			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
448			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
449			cst_lst.ibytes = 0;
450			cst_lst.obytes = 0;
451			cst_lst.max_conn = socket_info.nconns;
452			cst_lst.time_start = now;
453	elmex	1.1	}
454			#endif
455	root	1.9