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>

#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
}

/***********************************************************************
 *
 * SockList functions/utilities
 *
 **********************************************************************/

SockList &SockList::operator <<(const data8  &v)
{
  *this << uint8 (v.len);

  memcpy (buf + len, v.data, v.len);
  len += v.len;

  return *this;
}

SockList &SockList::operator <<(const data16 &v)
{
  *this << uint16 (v.len);

  memcpy (buf + len, v.data, v.len);
  len += v.len;

  return *this;
}

SockList &SockList::operator <<(const char *v)
{
  if (v)
    {
      int l = strlen (v);
      memcpy (buf + len, v, l);
      len += l;
    }

  return *this;
}

/* Basically does the reverse of SockList_AddInt, but on
 * strings instead.  Same for the GetShort, but for 16 bits.
 */
int
GetInt_String (unsigned char *data)
{
  return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
}

short
GetShort_String (unsigned char *data)
{
  return ((data[0] << 8) + data[1]);
}

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

/**
 * This reads from fd and puts the data in sl.  We return true if we think
 * we have a full packet, 0 if we have a partial packet.  The only processing
 * we do is remove the intial size value.  len (As passed) is the size of the
 * buffer allocated in the socklist.  We make the assumption the buffer is
 * at least 2 bytes long.
 */

int
SockList_ReadPacket (int fd, SockList * sl, int len)
{
  int stat, toread;

  /* Sanity check - shouldn't happen */
  if (sl->len < 0)
    {
      abort ();
    }
  /* We already have a partial packet */
  if (sl->len < 2)
    {
      do
        {
          stat = read (fd, sl->buf + sl->len, 2 - sl->len);
        }
      while ((stat == -1) && (errno == EINTR));

      if (stat < 0)
        {
          /* In non blocking mode, EAGAIN is set when there is no
           * data available.
           */
          if (errno != EAGAIN && errno != EWOULDBLOCK)
            {
              LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
            }
          return 0;             /*Error */
        }
      if (stat == 0)
        return -1;
      sl->len += stat;
#ifdef CS_LOGSTATS
      cst_tot.ibytes += stat;
      cst_lst.ibytes += stat;
#endif
      if (stat < 2)
        return 0;               /* Still don't have a full packet */
    }
  /* Figure out how much more data we need to read.  Add 2 from the
   * end of this - size header information is not included.
   */
  toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
  if ((toread + sl->len) >= len)
    {
      LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
      /* Quick hack in case for 'oldsocketmode' input.  If we are
       * closing the socket anyways, then reading this extra 100 bytes
       * shouldn't hurt.
       */
      read (fd, sl->buf + 2, 100);

      /* return error so the socket is closed */
      return -1;
    }
  do
    {
      do
        {
          stat = read (fd, sl->buf + sl->len, toread);
        }
      while ((stat < 0) && (errno == EINTR));
      if (stat < 0)
        {

          if (errno != EAGAIN && errno != EWOULDBLOCK)
            {
              LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
            }
          return 0;             /*Error */
        }
      if (stat == 0)
        return -1;
      sl->len += stat;
#ifdef CS_LOGSTATS
      cst_tot.ibytes += stat;
      cst_lst.ibytes += stat;
#endif
      toread -= stat;
      if (toread == 0)
        return 1;
      if (toread < 0)
        {
          LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
          return 1;
        }
    }
  while (toread > 0);
  return 0;
}

/*******************************************************************************
 *
 * 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
cs_write_string (NewSocket * ns, const char *buf, int len)
{
  SockList sl;

  sl.len = len;
  sl.buf = (unsigned char *) buf;
  Send_With_Handling (ns, &sl);
}


/**
 * Calls Write_To_Socket to send data to the client.
 *
 * The only difference in this function is that we take a SockList
 *, and we prepend the length information.
 */
void
Send_With_Handling (NewSocket * ns, SockList * 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);
}

/**
 * Takes a string of data, and writes it out to the socket. A very handy
 * shortcut function.
 */
void
Write_String_To_Socket (NewSocket * ns, char *buf, int len)
{
  SockList sl;

  sl.len = len;
  sl.buf = (unsigned char *) buf;
  Send_With_Handling (ns, &sl);
}


/******************************************************************************
 *
 * 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:	1.10
Committed:	Wed Dec 13 18:51:50 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+12 -0 lines
Log Message:	started simplifying network code
#	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
41			#ifdef __linux__
42			# include <sys/types.h>
43			# include <sys/socket.h>
44			# include <netinet/in.h>
45	root	1.5	# define TCP_HZ 1000 // sorry...
46	elmex	1.1	# 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			#define SOCKET_TIMEOUT1 10
52			#define SOCKET_TIMEOUT2 20
53
54	root	1.5	void
55			Socket_Flush (NewSocket * ns)
56	elmex	1.1	{
57			#ifdef __linux__
58			// check time of last ack, and, if too old, kill connection
59			struct tcp_info tcpi;
60			socklen_t len = sizeof (tcpi);
61
62			if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63			{
64			unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65
66	root	1.5	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
67			&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
68	elmex	1.1	{
69	root	1.3	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
70	root	1.5	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71	elmex	1.1	ns->status = Ns_Dead;
72			}
73			}
74
75			int val;
76	root	1.5
77	root	1.9	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
78			val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79	elmex	1.1	#endif
80			}
81
82			/***********************************************************************
83			*
84			* SockList functions/utilities
85			*
86			**********************************************************************/
87
88	root	1.9	SockList &SockList::operator <<(const data8 &v)
89	elmex	1.1	{
90	root	1.9	*this << uint8 (v.len);
91
92			memcpy (buf + len, v.data, v.len);
93			len += v.len;
94
95			return *this;
96	elmex	1.1	}
97
98	root	1.9	SockList &SockList::operator <<(const data16 &v)
99	elmex	1.1	{
100	root	1.9	*this << uint16 (v.len);
101
102			memcpy (buf + len, v.data, v.len);
103			len += v.len;
104	elmex	1.1
105	root	1.9	return *this;
106	elmex	1.1	}
107
108	root	1.10	SockList &SockList::operator <<(const char *v)
109			{
110			if (v)
111			{
112			int l = strlen (v);
113			memcpy (buf + len, v, l);
114			len += l;
115			}
116
117			return *this;
118			}
119
120	elmex	1.1	/* Basically does the reverse of SockList_AddInt, but on
121			* strings instead. Same for the GetShort, but for 16 bits.
122			*/
123	root	1.5	int
124			GetInt_String (unsigned char *data)
125	elmex	1.1	{
126	root	1.5	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127	elmex	1.1	}
128
129	root	1.5	short
130			GetShort_String (unsigned char *data)
131			{
132			return ((data[0] << 8) + data[1]);
133	elmex	1.1	}
134
135			/******************************************************************************
136			*
137			* Start of read routines.
138			*
139			******************************************************************************/
140
141			/**
142			* This reads from fd and puts the data in sl. We return true if we think
143			* we have a full packet, 0 if we have a partial packet. The only processing
144			* we do is remove the intial size value. len (As passed) is the size of the
145			* buffer allocated in the socklist. We make the assumption the buffer is
146			* at least 2 bytes long.
147			*/
148	root	1.5
149			int
150			SockList_ReadPacket (int fd, SockList * sl, int len)
151	elmex	1.1	{
152	root	1.5	int stat, toread;
153	elmex	1.1
154	root	1.5	/* Sanity check - shouldn't happen */
155			if (sl->len < 0)
156			{
157			abort ();
158	elmex	1.1	}
159	root	1.5	/* We already have a partial packet */
160			if (sl->len < 2)
161			{
162			do
163			{
164			stat = read (fd, sl->buf + sl->len, 2 - sl->len);
165			}
166			while ((stat == -1) && (errno == EINTR));
167	pippijn	1.8
168	root	1.5	if (stat < 0)
169			{
170			/* In non blocking mode, EAGAIN is set when there is no
171			* data available.
172			*/
173			if (errno != EAGAIN && errno != EWOULDBLOCK)
174			{
175			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
176	root	1.3	}
177	root	1.5	return 0; /Error /
178	root	1.3	}
179	root	1.5	if (stat == 0)
180			return -1;
181			sl->len += stat;
182	elmex	1.1	#ifdef CS_LOGSTATS
183	root	1.5	cst_tot.ibytes += stat;
184			cst_lst.ibytes += stat;
185	elmex	1.1	#endif
186	root	1.5	if (stat < 2)
187			return 0; /* Still don't have a full packet */
188	elmex	1.1	}
189	root	1.5	/* Figure out how much more data we need to read. Add 2 from the
190			* end of this - size header information is not included.
191			*/
192			toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
193			if ((toread + sl->len) >= len)
194			{
195			LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
196			/* Quick hack in case for 'oldsocketmode' input. If we are
197			* closing the socket anyways, then reading this extra 100 bytes
198			* shouldn't hurt.
199			*/
200			read (fd, sl->buf + 2, 100);
201	elmex	1.1
202	root	1.5	/* return error so the socket is closed */
203			return -1;
204	elmex	1.1	}
205	root	1.5	do
206			{
207			do
208			{
209			stat = read (fd, sl->buf + sl->len, toread);
210			}
211			while ((stat < 0) && (errno == EINTR));
212			if (stat < 0)
213			{
214
215			if (errno != EAGAIN && errno != EWOULDBLOCK)
216			{
217			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
218	root	1.3	}
219	root	1.5	return 0; /Error /
220	root	1.3	}
221	root	1.5	if (stat == 0)
222			return -1;
223			sl->len += stat;
224	elmex	1.1	#ifdef CS_LOGSTATS
225	root	1.5	cst_tot.ibytes += stat;
226			cst_lst.ibytes += stat;
227	elmex	1.1	#endif
228	root	1.5	toread -= stat;
229			if (toread == 0)
230			return 1;
231			if (toread < 0)
232			{
233			LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
234			return 1;
235	root	1.3	}
236	root	1.5	}
237			while (toread > 0);
238			return 0;
239	elmex	1.1	}
240
241			/*******************************************************************************
242			*
243			* Start of write related routines.
244			*
245			******************************************************************************/
246
247			/**
248			* Adds data to a socket buffer for whatever reason.
249			*
250			* ns is the socket we are adding the data to, buf is the start of the
251			* data, and len is the number of bytes to add.
252			*/
253
254	root	1.5	static void
255			add_to_buffer (NewSocket * ns, char *buf, int len)
256	elmex	1.1	{
257	root	1.5	int avail, end;
258	elmex	1.1
259	root	1.5	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
260			{
261			LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
262			ns->status = Ns_Dead;
263			return;
264			}
265
266			/* data + end is where we start putting the new data. The last byte
267			* currently in use is actually data + end -1
268			*/
269
270			end = ns->outputbuffer.start + ns->outputbuffer.len;
271			/* The buffer is already in a wrapped state, so adjust end */
272			if (end >= SOCKETBUFSIZE)
273			end -= SOCKETBUFSIZE;
274	root	1.7
275	root	1.5	avail = SOCKETBUFSIZE - end;
276	elmex	1.1
277	root	1.5	/* We can all fit it behind the current data without wrapping */
278			if (avail >= len)
279	root	1.7	memcpy (ns->outputbuffer.data + end, buf, len);
280	root	1.5	else
281			{
282			memcpy (ns->outputbuffer.data + end, buf, avail);
283			memcpy (ns->outputbuffer.data, buf + avail, len - avail);
284	elmex	1.1	}
285	root	1.7
286	root	1.5	ns->outputbuffer.len += len;
287	elmex	1.1	#if 0
288	root	1.5	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
289	elmex	1.1	#endif
290			}
291
292			/**
293			* Writes data to socket.
294			*
295			* When the socket is clear to write, and we have backlogged data, this
296			* is called to write it out.
297			*/
298	root	1.5	void
299			write_socket_buffer (NewSocket * ns)
300	elmex	1.1	{
301	root	1.5	int amt, max;
302	elmex	1.1
303	root	1.5	if (ns->outputbuffer.len == 0)
304			{
305			LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
306			return;
307	elmex	1.1	}
308
309	root	1.5	do
310			{
311			max = SOCKETBUFSIZE - ns->outputbuffer.start;
312			if (ns->outputbuffer.len < max)
313			max = ns->outputbuffer.len;
314	elmex	1.1
315	root	1.5	do
316			{
317			amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
318			}
319			while ((amt < 0) && (errno == EINTR));
320	elmex	1.1
321	root	1.5	if (amt < 0)
322			{ /* We got an error */
323	elmex	1.1
324	root	1.5	if (errno != EWOULDBLOCK)
325			{
326			LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
327			ns->status = Ns_Dead;
328			return;
329	root	1.3	}
330	root	1.5	else
331			{ /* EWOULDBLOCK */
332			/* can't write it, so store it away. */
333			ns->can_write = 0;
334			return;
335	root	1.3	}
336			}
337	root	1.5	ns->outputbuffer.start += amt;
338			/* wrap back to start of buffer */
339			if (ns->outputbuffer.start == SOCKETBUFSIZE)
340			ns->outputbuffer.start = 0;
341			ns->outputbuffer.len -= amt;
342	elmex	1.1	#ifdef CS_LOGSTATS
343	root	1.5	cst_tot.obytes += amt;
344			cst_lst.obytes += amt;
345			#endif
346			}
347			while (ns->outputbuffer.len > 0);
348	elmex	1.1	}
349
350			/**
351			* This writes data to the socket. - It is very low level -
352			* all we try and do is write out the data to the socket
353			* provided (ns). buf is the data to write, len is the number
354			* of bytes to write. IT doesn't return anything - rather, it
355			* updates the ns structure if we get an error.
356			*/
357	root	1.5	void
358			Write_To_Socket (NewSocket * ns, char *buf, int len)
359	elmex	1.1	{
360	root	1.5	int amt = 0;
361			char *pos = buf;
362	elmex	1.1
363	root	1.5	if (ns->status == Ns_Dead \|\| !buf)
364			{
365			LOG (llevDebug, "Write_To_Socket called with dead socket\n");
366			return;
367	elmex	1.1	}
368	root	1.5
369			#ifndef __GNU__ /* This caused problems on Hurd */
370			if (!ns->can_write)
371			{
372			add_to_buffer (ns, buf, len);
373			return;
374	elmex	1.1	}
375			#endif
376	root	1.5	/* If we manage to write more than we wanted, take it as a bonus */
377			while (len > 0)
378			{
379	elmex	1.1
380	root	1.5	do
381			{
382			amt = write (ns->fd, pos, len);
383			}
384			while ((amt < 0) && (errno == EINTR));
385	elmex	1.1
386	root	1.5	if (amt < 0)
387			{ /* We got an error */
388			if (errno != EWOULDBLOCK)
389			{
390			LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
391			errno, strerror (errno));
392			ns->status = Ns_Dead;
393			return;
394	root	1.3	}
395	root	1.5	else
396			{ /* EWOULDBLOCK */
397			/* can't write it, so store it away. */
398			add_to_buffer (ns, pos, len);
399			ns->can_write = 0;
400			return;
401	root	1.3	}
402			}
403	root	1.5	/* amt gets set to 0 above in blocking code, so we do this as
404			* an else if to make sure we don't reprocess it.
405			*/
406			else if (amt == 0)
407			{
408			LOG (llevError, "Write_To_Socket: No data written out.\n");
409	root	1.3	}
410	root	1.5	len -= amt;
411			pos += amt;
412	elmex	1.1	#ifdef CS_LOGSTATS
413	root	1.5	cst_tot.obytes += amt;
414			cst_lst.obytes += amt;
415			#endif
416	elmex	1.1	}
417			}
418
419
420			/**
421			* Takes a string of data, and writes it out to the socket. A very handy
422			* shortcut function.
423			*/
424	root	1.5	void
425			cs_write_string (NewSocket * ns, const char *buf, int len)
426	elmex	1.1	{
427	root	1.5	SockList sl;
428	elmex	1.1
429	root	1.5	sl.len = len;
430			sl.buf = (unsigned char *) buf;
431			Send_With_Handling (ns, &sl);
432	elmex	1.1	}
433
434
435			/**
436			* Calls Write_To_Socket to send data to the client.
437			*
438			* The only difference in this function is that we take a SockList
439			*, and we prepend the length information.
440			*/
441	root	1.5	void
442			Send_With_Handling (NewSocket * ns, SockList * msg)
443	elmex	1.1	{
444	root	1.5	unsigned char sbuf[4];
445	elmex	1.1
446	root	1.5	if (ns->status == Ns_Dead \|\| !msg)
447			return;
448	elmex	1.1
449	root	1.5	if (msg->len >= MAXSOCKBUF)
450			{
451			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);
452			/* Almost certainly we've overflowed a buffer, so quite now to make
453			* it easier to debug.
454			*/
455			abort ();
456			}
457			sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
458			sbuf[1] = ((uint32) (msg->len)) & 0xFF;
459			if (ns->status != Ns_Old)
460			Write_To_Socket (ns, (char *) sbuf, 2);
461			Write_To_Socket (ns, (char *) msg->buf, msg->len);
462	elmex	1.1	}
463
464			/**
465			* Takes a string of data, and writes it out to the socket. A very handy
466			* shortcut function.
467			*/
468	root	1.5	void
469			Write_String_To_Socket (NewSocket * ns, char *buf, int len)
470	elmex	1.1	{
471	root	1.5	SockList sl;
472	elmex	1.1
473	root	1.5	sl.len = len;
474			sl.buf = (unsigned char *) buf;
475			Send_With_Handling (ns, &sl);
476	elmex	1.1	}
477
478
479			/******************************************************************************
480			*
481			* statistics logging functions.
482			*
483			******************************************************************************/
484
485			#ifdef CS_LOGSTATS
486	root	1.5
487	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
488			* stats
489			*/
490			CS_Stats cst_tot, cst_lst;
491
492			/**
493			* Writes out the gathered stats. We clear cst_lst.
494			*/
495	root	1.5	void
496			write_cs_stats (void)
497	elmex	1.1	{
498	root	1.5	time_t now = time (NULL);
499	elmex	1.1
500	root	1.5	/* If no connections recently, don't both to log anything */
501			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
502			return;
503
504			/* CSSTAT is put in so scripts can easily find the line */
505			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
506			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
507			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
508			cst_lst.ibytes = 0;
509			cst_lst.obytes = 0;
510			cst_lst.max_conn = socket_info.nconns;
511			cst_lst.time_start = now;
512	elmex	1.1	}
513			#endif
514	root	1.9