server/socket/lowlevel.C


/*
 * static char *rcsid_sockets_c =
 *    "$Id: lowlevel.C,v 1.4 2006-08-30 16:30:37 root Exp $";
 */

/*
    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
 *
 **********************************************************************/

void
SockList_Init (SockList * sl)
{
  sl->len = 0;
  sl->buf = NULL;
}

void
SockList_AddInt (SockList * sl, uint32 data)
{
  sl->buf[sl->len++] = (data >> 24) & 0xff;
  sl->buf[sl->len++] = (data >> 16) & 0xff;
  sl->buf[sl->len++] = (data >> 8) & 0xff;
  sl->buf[sl->len++] = data & 0xff;
}

void
SockList_AddInt64 (SockList * sl, uint64 data)
{
  sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
  sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
  sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
  sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);

  sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
  sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
  sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
  sl->buf[sl->len++] = (char) (data & 0xff);
}

/* 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)
    {
#ifdef WIN32                    /* ***WIN32 SockList_ReadPacket: change read() to recv() */

      stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);

#else
      do
        {
          stat = read (fd, sl->buf + sl->len, 2 - sl->len);
        }
      while ((stat == -1) && (errno == EINTR));
#endif
      if (stat < 0)
        {
          /* In non blocking mode, EAGAIN is set when there is no
           * data available.
           */
#ifdef WIN32                    /* ***WIN32 SockList_ReadPacket: error handling for win32 */
          if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
            {
              if (WSAGetLastError () == WSAECONNRESET)
                LOG (llevDebug, "Connection closed by client\n");
              else
                {
                  LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
                }
              return -1;        /* kick this user! */
            }
#else
          if (errno != EAGAIN && errno != EWOULDBLOCK)
            {
              LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
            }
#endif
          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.
       */
#ifdef WIN32                    /* ***win32 SockList_ReadPacket: change read() to recv() */
      recv (fd, sl->buf + 2, 100, 0);
#else
      read (fd, sl->buf + 2, 100);
#endif /* end win32 */

      /* return error so the socket is closed */
      return -1;
    }
  do
    {
#ifdef WIN32                    /* ***win32 SockList_ReadPacket: change read() to recv() */
      stat = recv (fd, sl->buf + sl->len, toread, 0);
#else
      do
        {
          stat = read (fd, sl->buf + sl->len, toread);
        }
      while ((stat < 0) && (errno == EINTR));
#endif
      if (stat < 0)
        {

#ifdef WIN32                    /* ***win32 SockList_ReadPacket: change error handling for win32 */
          if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
            {
              if (WSAGetLastError () == WSAECONNRESET)
                LOG (llevDebug, "Connection closed by client\n");
              else
                {
                  LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
                }
              return -1;        /* kick this user! */
            }
#else
          if (errno != EAGAIN && errno != EWOULDBLOCK)
            {
              LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
            }
#endif
          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;

#ifdef WIN32                    /* ***win32 write_socket_buffer: change write() to send() */
      amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
#else
      do
        {
          amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
        }
      while ((amt < 0) && (errno == EINTR));
#endif

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

#ifdef WIN32                    /* ***win32 write_socket_buffer: change error handling */
          if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
#else
          if (errno != EWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
#endif
              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)
    {

#ifdef WIN32                    /* ***win32 Write_To_Socket: change write() to send() */
      amt = send (ns->fd, pos, len, 0);
#else
      do
        {
          amt = write (ns->fd, pos, len);
        }
      while ((amt < 0) && (errno == EINTR));
#endif

      if (amt < 0)
        {                       /* We got an error */
#ifdef WIN32                    /* ***win32 Write_To_Socket: change error handling */
          if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
#else
          if (errno != EWOULDBLOCK)
            {
              LOG (llevError, "New socket write failed WTS (%d: %s).\n",        /* ---WIN32 */
                   errno, strerror (errno));
#endif
              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:	1.5
Committed:	Sun Sep 10 13:43:33 2006 UTC (17 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+311 -253 lines
Log Message:	indent
#	User	Rev	Content
1	elmex	1.1
2			/*
3			* static char *rcsid_sockets_c =
4	root	1.5	* "$Id: lowlevel.C,v 1.4 2006-08-30 16:30:37 root Exp $";
5	elmex	1.1	*/
6
7			/*
8			CrossFire, A Multiplayer game for X-windows
9
10			Copyright (C) 1992 Frank Tore Johansen
11
12			This program is free software; you can redistribute it and/or modify
13			it under the terms of the GNU General Public License as published by
14			the Free Software Foundation; either version 2 of the License, or
15			(at your option) any later version.
16
17			This program is distributed in the hope that it will be useful,
18			but WITHOUT ANY WARRANTY; without even the implied warranty of
19			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20			GNU General Public License for more details.
21
22			You should have received a copy of the GNU General Public License
23			along with this program; if not, write to the Free Software
24			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26			The author can be reached via e-mail to mark@pyramid.com
27			*/
28
29			/**
30			* \file
31			* Low-level socket-related functions.
32			*
33			* \date 2003-12-02
34			*
35			* Contains some base functions that both the client and server
36			* can use. As such, depending what we are being compiled for will
37			* determine what we can include. the client is designed have
38			* CFCLIENT defined as part of its compile flags.
39			*/
40
41			using namespace std;
42
43			#include <global.h>
44			#include <newclient.h>
45			#include <sproto.h>
46
47			#ifdef __linux__
48			# include <sys/types.h>
49			# include <sys/socket.h>
50			# include <netinet/in.h>
51	root	1.5	# define TCP_HZ 1000 // sorry...
52	elmex	1.1	# include <netinet/tcp.h>
53			#endif
54
55			// use a really low timeout, as it doesn't cost any bandwidth, and you can
56			// easily die in 20 seconds...
57			#define SOCKET_TIMEOUT1 10
58			#define SOCKET_TIMEOUT2 20
59
60	root	1.5	void
61			Socket_Flush (NewSocket * ns)
62	elmex	1.1	{
63			#ifdef __linux__
64			// check time of last ack, and, if too old, kill connection
65			struct tcp_info tcpi;
66			socklen_t len = sizeof (tcpi);
67
68			if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
69			{
70			unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
71
72	root	1.5	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
73			&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
74	elmex	1.1	{
75	root	1.3	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
76	root	1.5	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77	elmex	1.1	ns->status = Ns_Dead;
78			}
79			}
80
81			int val;
82	root	1.5
83			val = 0;
84			setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
85			val = 1;
86			setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
87	elmex	1.1	#endif
88			}
89
90			/***********************************************************************
91			*
92			* SockList functions/utilities
93			*
94			**********************************************************************/
95
96	root	1.5	void
97			SockList_Init (SockList * sl)
98	elmex	1.1	{
99	root	1.5	sl->len = 0;
100			sl->buf = NULL;
101	elmex	1.1	}
102
103	root	1.5	void
104			SockList_AddInt (SockList * sl, uint32 data)
105	elmex	1.1	{
106	root	1.5	sl->buf[sl->len++] = (data >> 24) & 0xff;
107			sl->buf[sl->len++] = (data >> 16) & 0xff;
108			sl->buf[sl->len++] = (data >> 8) & 0xff;
109			sl->buf[sl->len++] = data & 0xff;
110	elmex	1.1	}
111
112	root	1.5	void
113			SockList_AddInt64 (SockList * sl, uint64 data)
114	elmex	1.1	{
115	root	1.5	sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
116			sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
117			sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
118			sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
119	elmex	1.1
120	root	1.5	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
121			sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
122			sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
123			sl->buf[sl->len++] = (char) (data & 0xff);
124	elmex	1.1	}
125
126			/* Basically does the reverse of SockList_AddInt, but on
127			* strings instead. Same for the GetShort, but for 16 bits.
128			*/
129	root	1.5	int
130			GetInt_String (unsigned char *data)
131	elmex	1.1	{
132	root	1.5	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
133	elmex	1.1	}
134
135	root	1.5	short
136			GetShort_String (unsigned char *data)
137			{
138			return ((data[0] << 8) + data[1]);
139	elmex	1.1	}
140
141			/******************************************************************************
142			*
143			* Start of read routines.
144			*
145			******************************************************************************/
146
147			/**
148			* This reads from fd and puts the data in sl. We return true if we think
149			* we have a full packet, 0 if we have a partial packet. The only processing
150			* we do is remove the intial size value. len (As passed) is the size of the
151			* buffer allocated in the socklist. We make the assumption the buffer is
152			* at least 2 bytes long.
153			*/
154	root	1.5
155			int
156			SockList_ReadPacket (int fd, SockList * sl, int len)
157	elmex	1.1	{
158	root	1.5	int stat, toread;
159	elmex	1.1
160	root	1.5	/* Sanity check - shouldn't happen */
161			if (sl->len < 0)
162			{
163			abort ();
164	elmex	1.1	}
165	root	1.5	/* We already have a partial packet */
166			if (sl->len < 2)
167			{
168			#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
169	elmex	1.1
170	root	1.5	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);
171	elmex	1.1
172			#else
173	root	1.5	do
174			{
175			stat = read (fd, sl->buf + sl->len, 2 - sl->len);
176			}
177			while ((stat == -1) && (errno == EINTR));
178			#endif
179			if (stat < 0)
180			{
181			/* In non blocking mode, EAGAIN is set when there is no
182			* data available.
183			*/
184			#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /
185			if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
186			{
187			if (WSAGetLastError () == WSAECONNRESET)
188			LOG (llevDebug, "Connection closed by client\n");
189			else
190	root	1.3	{
191	root	1.5	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
192	root	1.3	}
193	root	1.5	return -1; /* kick this user! */
194	root	1.3	}
195	elmex	1.1	#else
196	root	1.5	if (errno != EAGAIN && errno != EWOULDBLOCK)
197			{
198			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
199	root	1.3	}
200			#endif
201	root	1.5	return 0; /Error /
202	root	1.3	}
203	root	1.5	if (stat == 0)
204			return -1;
205			sl->len += stat;
206	elmex	1.1	#ifdef CS_LOGSTATS
207	root	1.5	cst_tot.ibytes += stat;
208			cst_lst.ibytes += stat;
209	elmex	1.1	#endif
210	root	1.5	if (stat < 2)
211			return 0; /* Still don't have a full packet */
212	elmex	1.1	}
213	root	1.5	/* Figure out how much more data we need to read. Add 2 from the
214			* end of this - size header information is not included.
215			*/
216			toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
217			if ((toread + sl->len) >= len)
218			{
219			LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
220			/* Quick hack in case for 'oldsocketmode' input. If we are
221			* closing the socket anyways, then reading this extra 100 bytes
222			* shouldn't hurt.
223			*/
224			#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
225			recv (fd, sl->buf + 2, 100, 0);
226	elmex	1.1	#else
227	root	1.5	read (fd, sl->buf + 2, 100);
228	elmex	1.1	#endif /* end win32 */
229
230	root	1.5	/* return error so the socket is closed */
231			return -1;
232	elmex	1.1	}
233	root	1.5	do
234			{
235			#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
236			stat = recv (fd, sl->buf + sl->len, toread, 0);
237	elmex	1.1	#else
238	root	1.5	do
239			{
240			stat = read (fd, sl->buf + sl->len, toread);
241			}
242			while ((stat < 0) && (errno == EINTR));
243			#endif
244			if (stat < 0)
245			{
246
247			#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
248			if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
249			{
250			if (WSAGetLastError () == WSAECONNRESET)
251			LOG (llevDebug, "Connection closed by client\n");
252			else
253	root	1.3	{
254	root	1.5	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
255	root	1.3	}
256	root	1.5	return -1; /* kick this user! */
257	root	1.3	}
258	elmex	1.1	#else
259	root	1.5	if (errno != EAGAIN && errno != EWOULDBLOCK)
260			{
261			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
262	root	1.3	}
263			#endif
264	root	1.5	return 0; /Error /
265	root	1.3	}
266	root	1.5	if (stat == 0)
267			return -1;
268			sl->len += stat;
269	elmex	1.1	#ifdef CS_LOGSTATS
270	root	1.5	cst_tot.ibytes += stat;
271			cst_lst.ibytes += stat;
272	elmex	1.1	#endif
273	root	1.5	toread -= stat;
274			if (toread == 0)
275			return 1;
276			if (toread < 0)
277			{
278			LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
279			return 1;
280	root	1.3	}
281	root	1.5	}
282			while (toread > 0);
283			return 0;
284	elmex	1.1	}
285
286			/*******************************************************************************
287			*
288			* Start of write related routines.
289			*
290			******************************************************************************/
291
292			/**
293			* Adds data to a socket buffer for whatever reason.
294			*
295			* ns is the socket we are adding the data to, buf is the start of the
296			* data, and len is the number of bytes to add.
297			*/
298
299	root	1.5	static void
300			add_to_buffer (NewSocket * ns, char *buf, int len)
301	elmex	1.1	{
302	root	1.5	int avail, end;
303	elmex	1.1
304	root	1.5	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
305			{
306			LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
307			ns->status = Ns_Dead;
308			return;
309			}
310
311			/* data + end is where we start putting the new data. The last byte
312			* currently in use is actually data + end -1
313			*/
314
315			end = ns->outputbuffer.start + ns->outputbuffer.len;
316			/* The buffer is already in a wrapped state, so adjust end */
317			if (end >= SOCKETBUFSIZE)
318			end -= SOCKETBUFSIZE;
319			avail = SOCKETBUFSIZE - end;
320	elmex	1.1
321	root	1.5	/* We can all fit it behind the current data without wrapping */
322			if (avail >= len)
323			{
324			memcpy (ns->outputbuffer.data + end, buf, len);
325	elmex	1.1	}
326	root	1.5	else
327			{
328			memcpy (ns->outputbuffer.data + end, buf, avail);
329			memcpy (ns->outputbuffer.data, buf + avail, len - avail);
330	elmex	1.1	}
331	root	1.5	ns->outputbuffer.len += len;
332	elmex	1.1	#if 0
333	root	1.5	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
334	elmex	1.1	#endif
335			}
336
337			/**
338			* Writes data to socket.
339			*
340			* When the socket is clear to write, and we have backlogged data, this
341			* is called to write it out.
342			*/
343	root	1.5	void
344			write_socket_buffer (NewSocket * ns)
345	elmex	1.1	{
346	root	1.5	int amt, max;
347	elmex	1.1
348	root	1.5	if (ns->outputbuffer.len == 0)
349			{
350			LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
351			return;
352	elmex	1.1	}
353
354	root	1.5	do
355			{
356			max = SOCKETBUFSIZE - ns->outputbuffer.start;
357			if (ns->outputbuffer.len < max)
358			max = ns->outputbuffer.len;
359	elmex	1.1
360	root	1.5	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
361			amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
362	elmex	1.1	#else
363	root	1.5	do
364			{
365			amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
366			}
367			while ((amt < 0) && (errno == EINTR));
368	elmex	1.1	#endif
369
370	root	1.5	if (amt < 0)
371			{ /* We got an error */
372	elmex	1.1
373	root	1.5	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
374			if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
375			{
376			LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
377	elmex	1.1	#else
378	root	1.5	if (errno != EWOULDBLOCK)
379			{
380			LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
381	root	1.3	#endif
382	root	1.5	ns->status = Ns_Dead;
383			return;
384	root	1.3	}
385	root	1.5	else
386			{ /* EWOULDBLOCK */
387			/* can't write it, so store it away. */
388			ns->can_write = 0;
389			return;
390	root	1.3	}
391			}
392	root	1.5	ns->outputbuffer.start += amt;
393			/* wrap back to start of buffer */
394			if (ns->outputbuffer.start == SOCKETBUFSIZE)
395			ns->outputbuffer.start = 0;
396			ns->outputbuffer.len -= amt;
397	elmex	1.1	#ifdef CS_LOGSTATS
398	root	1.5	cst_tot.obytes += amt;
399			cst_lst.obytes += amt;
400			#endif
401			}
402			while (ns->outputbuffer.len > 0);
403	elmex	1.1	}
404
405			/**
406			* This writes data to the socket. - It is very low level -
407			* all we try and do is write out the data to the socket
408			* provided (ns). buf is the data to write, len is the number
409			* of bytes to write. IT doesn't return anything - rather, it
410			* updates the ns structure if we get an error.
411			*/
412	root	1.5	void
413			Write_To_Socket (NewSocket * ns, char *buf, int len)
414	elmex	1.1	{
415	root	1.5	int amt = 0;
416			char *pos = buf;
417	elmex	1.1
418	root	1.5	if (ns->status == Ns_Dead \|\| !buf)
419			{
420			LOG (llevDebug, "Write_To_Socket called with dead socket\n");
421			return;
422	elmex	1.1	}
423	root	1.5
424			#ifndef __GNU__ /* This caused problems on Hurd */
425			if (!ns->can_write)
426			{
427			add_to_buffer (ns, buf, len);
428			return;
429	elmex	1.1	}
430			#endif
431	root	1.5	/* If we manage to write more than we wanted, take it as a bonus */
432			while (len > 0)
433			{
434	elmex	1.1
435	root	1.5	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
436			amt = send (ns->fd, pos, len, 0);
437	elmex	1.1	#else
438	root	1.5	do
439			{
440			amt = write (ns->fd, pos, len);
441			}
442			while ((amt < 0) && (errno == EINTR));
443	elmex	1.1	#endif
444
445	root	1.5	if (amt < 0)
446			{ /* We got an error */
447			#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
448			if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
449			{
450			LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
451	elmex	1.1	#else
452	root	1.5	if (errno != EWOULDBLOCK)
453			{
454			LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
455			errno, strerror (errno));
456	root	1.3	#endif
457	root	1.5	ns->status = Ns_Dead;
458			return;
459	root	1.3	}
460	root	1.5	else
461			{ /* EWOULDBLOCK */
462			/* can't write it, so store it away. */
463			add_to_buffer (ns, pos, len);
464			ns->can_write = 0;
465			return;
466	root	1.3	}
467			}
468	root	1.5	/* amt gets set to 0 above in blocking code, so we do this as
469			* an else if to make sure we don't reprocess it.
470			*/
471			else if (amt == 0)
472			{
473			LOG (llevError, "Write_To_Socket: No data written out.\n");
474	root	1.3	}
475	root	1.5	len -= amt;
476			pos += amt;
477	elmex	1.1	#ifdef CS_LOGSTATS
478	root	1.5	cst_tot.obytes += amt;
479			cst_lst.obytes += amt;
480			#endif
481	elmex	1.1	}
482			}
483
484
485			/**
486			* Takes a string of data, and writes it out to the socket. A very handy
487			* shortcut function.
488			*/
489	root	1.5	void
490			cs_write_string (NewSocket * ns, const char *buf, int len)
491	elmex	1.1	{
492	root	1.5	SockList sl;
493	elmex	1.1
494	root	1.5	sl.len = len;
495			sl.buf = (unsigned char *) buf;
496			Send_With_Handling (ns, &sl);
497	elmex	1.1	}
498
499
500			/**
501			* Calls Write_To_Socket to send data to the client.
502			*
503			* The only difference in this function is that we take a SockList
504			*, and we prepend the length information.
505			*/
506	root	1.5	void
507			Send_With_Handling (NewSocket * ns, SockList * msg)
508	elmex	1.1	{
509	root	1.5	unsigned char sbuf[4];
510	elmex	1.1
511	root	1.5	if (ns->status == Ns_Dead \|\| !msg)
512			return;
513	elmex	1.1
514	root	1.5	if (msg->len >= MAXSOCKBUF)
515			{
516			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);
517			/* Almost certainly we've overflowed a buffer, so quite now to make
518			* it easier to debug.
519			*/
520			abort ();
521			}
522			sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
523			sbuf[1] = ((uint32) (msg->len)) & 0xFF;
524			if (ns->status != Ns_Old)
525			Write_To_Socket (ns, (char *) sbuf, 2);
526			Write_To_Socket (ns, (char *) msg->buf, msg->len);
527	elmex	1.1	}
528
529			/**
530			* Takes a string of data, and writes it out to the socket. A very handy
531			* shortcut function.
532			*/
533	root	1.5	void
534			Write_String_To_Socket (NewSocket * ns, char *buf, int len)
535	elmex	1.1	{
536	root	1.5	SockList sl;
537	elmex	1.1
538	root	1.5	sl.len = len;
539			sl.buf = (unsigned char *) buf;
540			Send_With_Handling (ns, &sl);
541	elmex	1.1	}
542
543
544			/******************************************************************************
545			*
546			* statistics logging functions.
547			*
548			******************************************************************************/
549
550			#ifdef CS_LOGSTATS
551	root	1.5
552	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
553			* stats
554			*/
555			CS_Stats cst_tot, cst_lst;
556
557			/**
558			* Writes out the gathered stats. We clear cst_lst.
559			*/
560	root	1.5	void
561			write_cs_stats (void)
562	elmex	1.1	{
563	root	1.5	time_t now = time (NULL);
564	elmex	1.1
565	root	1.5	/* If no connections recently, don't both to log anything */
566			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
567			return;
568
569			/* CSSTAT is put in so scripts can easily find the line */
570			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
571			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
572			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
573			cst_lst.ibytes = 0;
574			cst_lst.obytes = 0;
575			cst_lst.max_conn = socket_info.nconns;
576			cst_lst.time_start = now;
577	elmex	1.1	}
578			#endif