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

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:	1.6
Committed:	Thu Sep 14 22:34:06 2006 UTC (17 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+0 -6 lines
Log Message:	indent
#	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			val = 0;
78			setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79			val = 1;
80			setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
81	elmex	1.1	#endif
82			}
83
84			/***********************************************************************
85			*
86			* SockList functions/utilities
87			*
88			**********************************************************************/
89
90	root	1.5	void
91			SockList_Init (SockList * sl)
92	elmex	1.1	{
93	root	1.5	sl->len = 0;
94			sl->buf = NULL;
95	elmex	1.1	}
96
97	root	1.5	void
98			SockList_AddInt (SockList * sl, uint32 data)
99	elmex	1.1	{
100	root	1.5	sl->buf[sl->len++] = (data >> 24) & 0xff;
101			sl->buf[sl->len++] = (data >> 16) & 0xff;
102			sl->buf[sl->len++] = (data >> 8) & 0xff;
103			sl->buf[sl->len++] = data & 0xff;
104	elmex	1.1	}
105
106	root	1.5	void
107			SockList_AddInt64 (SockList * sl, uint64 data)
108	elmex	1.1	{
109	root	1.5	sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
110			sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
111			sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
112			sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
113	elmex	1.1
114	root	1.5	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
115			sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
116			sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
117			sl->buf[sl->len++] = (char) (data & 0xff);
118	elmex	1.1	}
119
120			/* 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			#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
163	elmex	1.1
164	root	1.5	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);
165	elmex	1.1
166			#else
167	root	1.5	do
168			{
169			stat = read (fd, sl->buf + sl->len, 2 - sl->len);
170			}
171			while ((stat == -1) && (errno == EINTR));
172			#endif
173			if (stat < 0)
174			{
175			/* In non blocking mode, EAGAIN is set when there is no
176			* data available.
177			*/
178			#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /
179			if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
180			{
181			if (WSAGetLastError () == WSAECONNRESET)
182			LOG (llevDebug, "Connection closed by client\n");
183			else
184	root	1.3	{
185	root	1.5	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
186	root	1.3	}
187	root	1.5	return -1; /* kick this user! */
188	root	1.3	}
189	elmex	1.1	#else
190	root	1.5	if (errno != EAGAIN && errno != EWOULDBLOCK)
191			{
192			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
193	root	1.3	}
194			#endif
195	root	1.5	return 0; /Error /
196	root	1.3	}
197	root	1.5	if (stat == 0)
198			return -1;
199			sl->len += stat;
200	elmex	1.1	#ifdef CS_LOGSTATS
201	root	1.5	cst_tot.ibytes += stat;
202			cst_lst.ibytes += stat;
203	elmex	1.1	#endif
204	root	1.5	if (stat < 2)
205			return 0; /* Still don't have a full packet */
206	elmex	1.1	}
207	root	1.5	/* Figure out how much more data we need to read. Add 2 from the
208			* end of this - size header information is not included.
209			*/
210			toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
211			if ((toread + sl->len) >= len)
212			{
213			LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
214			/* Quick hack in case for 'oldsocketmode' input. If we are
215			* closing the socket anyways, then reading this extra 100 bytes
216			* shouldn't hurt.
217			*/
218			#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
219			recv (fd, sl->buf + 2, 100, 0);
220	elmex	1.1	#else
221	root	1.5	read (fd, sl->buf + 2, 100);
222	elmex	1.1	#endif /* end win32 */
223
224	root	1.5	/* return error so the socket is closed */
225			return -1;
226	elmex	1.1	}
227	root	1.5	do
228			{
229			#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
230			stat = recv (fd, sl->buf + sl->len, toread, 0);
231	elmex	1.1	#else
232	root	1.5	do
233			{
234			stat = read (fd, sl->buf + sl->len, toread);
235			}
236			while ((stat < 0) && (errno == EINTR));
237			#endif
238			if (stat < 0)
239			{
240
241			#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
242			if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
243			{
244			if (WSAGetLastError () == WSAECONNRESET)
245			LOG (llevDebug, "Connection closed by client\n");
246			else
247	root	1.3	{
248	root	1.5	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
249	root	1.3	}
250	root	1.5	return -1; /* kick this user! */
251	root	1.3	}
252	elmex	1.1	#else
253	root	1.5	if (errno != EAGAIN && errno != EWOULDBLOCK)
254			{
255			LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
256	root	1.3	}
257			#endif
258	root	1.5	return 0; /Error /
259	root	1.3	}
260	root	1.5	if (stat == 0)
261			return -1;
262			sl->len += stat;
263	elmex	1.1	#ifdef CS_LOGSTATS
264	root	1.5	cst_tot.ibytes += stat;
265			cst_lst.ibytes += stat;
266	elmex	1.1	#endif
267	root	1.5	toread -= stat;
268			if (toread == 0)
269			return 1;
270			if (toread < 0)
271			{
272			LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
273			return 1;
274	root	1.3	}
275	root	1.5	}
276			while (toread > 0);
277			return 0;
278	elmex	1.1	}
279
280			/*******************************************************************************
281			*
282			* Start of write related routines.
283			*
284			******************************************************************************/
285
286			/**
287			* Adds data to a socket buffer for whatever reason.
288			*
289			* ns is the socket we are adding the data to, buf is the start of the
290			* data, and len is the number of bytes to add.
291			*/
292
293	root	1.5	static void
294			add_to_buffer (NewSocket * ns, char *buf, int len)
295	elmex	1.1	{
296	root	1.5	int avail, end;
297	elmex	1.1
298	root	1.5	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
299			{
300			LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
301			ns->status = Ns_Dead;
302			return;
303			}
304
305			/* data + end is where we start putting the new data. The last byte
306			* currently in use is actually data + end -1
307			*/
308
309			end = ns->outputbuffer.start + ns->outputbuffer.len;
310			/* The buffer is already in a wrapped state, so adjust end */
311			if (end >= SOCKETBUFSIZE)
312			end -= SOCKETBUFSIZE;
313			avail = SOCKETBUFSIZE - end;
314	elmex	1.1
315	root	1.5	/* We can all fit it behind the current data without wrapping */
316			if (avail >= len)
317			{
318			memcpy (ns->outputbuffer.data + end, buf, len);
319	elmex	1.1	}
320	root	1.5	else
321			{
322			memcpy (ns->outputbuffer.data + end, buf, avail);
323			memcpy (ns->outputbuffer.data, buf + avail, len - avail);
324	elmex	1.1	}
325	root	1.5	ns->outputbuffer.len += len;
326	elmex	1.1	#if 0
327	root	1.5	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
328	elmex	1.1	#endif
329			}
330
331			/**
332			* Writes data to socket.
333			*
334			* When the socket is clear to write, and we have backlogged data, this
335			* is called to write it out.
336			*/
337	root	1.5	void
338			write_socket_buffer (NewSocket * ns)
339	elmex	1.1	{
340	root	1.5	int amt, max;
341	elmex	1.1
342	root	1.5	if (ns->outputbuffer.len == 0)
343			{
344			LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
345			return;
346	elmex	1.1	}
347
348	root	1.5	do
349			{
350			max = SOCKETBUFSIZE - ns->outputbuffer.start;
351			if (ns->outputbuffer.len < max)
352			max = ns->outputbuffer.len;
353	elmex	1.1
354	root	1.5	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
355			amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
356	elmex	1.1	#else
357	root	1.5	do
358			{
359			amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
360			}
361			while ((amt < 0) && (errno == EINTR));
362	elmex	1.1	#endif
363
364	root	1.5	if (amt < 0)
365			{ /* We got an error */
366	elmex	1.1
367	root	1.5	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
368			if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
369			{
370			LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
371	elmex	1.1	#else
372	root	1.5	if (errno != EWOULDBLOCK)
373			{
374			LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
375	root	1.3	#endif
376	root	1.5	ns->status = Ns_Dead;
377			return;
378	root	1.3	}
379	root	1.5	else
380			{ /* EWOULDBLOCK */
381			/* can't write it, so store it away. */
382			ns->can_write = 0;
383			return;
384	root	1.3	}
385			}
386	root	1.5	ns->outputbuffer.start += amt;
387			/* wrap back to start of buffer */
388			if (ns->outputbuffer.start == SOCKETBUFSIZE)
389			ns->outputbuffer.start = 0;
390			ns->outputbuffer.len -= amt;
391	elmex	1.1	#ifdef CS_LOGSTATS
392	root	1.5	cst_tot.obytes += amt;
393			cst_lst.obytes += amt;
394			#endif
395			}
396			while (ns->outputbuffer.len > 0);
397	elmex	1.1	}
398
399			/**
400			* This writes data to the socket. - It is very low level -
401			* all we try and do is write out the data to the socket
402			* provided (ns). buf is the data to write, len is the number
403			* of bytes to write. IT doesn't return anything - rather, it
404			* updates the ns structure if we get an error.
405			*/
406	root	1.5	void
407			Write_To_Socket (NewSocket * ns, char *buf, int len)
408	elmex	1.1	{
409	root	1.5	int amt = 0;
410			char *pos = buf;
411	elmex	1.1
412	root	1.5	if (ns->status == Ns_Dead \|\| !buf)
413			{
414			LOG (llevDebug, "Write_To_Socket called with dead socket\n");
415			return;
416	elmex	1.1	}
417	root	1.5
418			#ifndef __GNU__ /* This caused problems on Hurd */
419			if (!ns->can_write)
420			{
421			add_to_buffer (ns, buf, len);
422			return;
423	elmex	1.1	}
424			#endif
425	root	1.5	/* If we manage to write more than we wanted, take it as a bonus */
426			while (len > 0)
427			{
428	elmex	1.1
429	root	1.5	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
430			amt = send (ns->fd, pos, len, 0);
431	elmex	1.1	#else
432	root	1.5	do
433			{
434			amt = write (ns->fd, pos, len);
435			}
436			while ((amt < 0) && (errno == EINTR));
437	elmex	1.1	#endif
438
439	root	1.5	if (amt < 0)
440			{ /* We got an error */
441			#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
442			if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
443			{
444			LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
445	elmex	1.1	#else
446	root	1.5	if (errno != EWOULDBLOCK)
447			{
448			LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
449			errno, strerror (errno));
450	root	1.3	#endif
451	root	1.5	ns->status = Ns_Dead;
452			return;
453	root	1.3	}
454	root	1.5	else
455			{ /* EWOULDBLOCK */
456			/* can't write it, so store it away. */
457			add_to_buffer (ns, pos, len);
458			ns->can_write = 0;
459			return;
460	root	1.3	}
461			}
462	root	1.5	/* amt gets set to 0 above in blocking code, so we do this as
463			* an else if to make sure we don't reprocess it.
464			*/
465			else if (amt == 0)
466			{
467			LOG (llevError, "Write_To_Socket: No data written out.\n");
468	root	1.3	}
469	root	1.5	len -= amt;
470			pos += amt;
471	elmex	1.1	#ifdef CS_LOGSTATS
472	root	1.5	cst_tot.obytes += amt;
473			cst_lst.obytes += amt;
474			#endif
475	elmex	1.1	}
476			}
477
478
479			/**
480			* Takes a string of data, and writes it out to the socket. A very handy
481			* shortcut function.
482			*/
483	root	1.5	void
484			cs_write_string (NewSocket * ns, const char *buf, int len)
485	elmex	1.1	{
486	root	1.5	SockList sl;
487	elmex	1.1
488	root	1.5	sl.len = len;
489			sl.buf = (unsigned char *) buf;
490			Send_With_Handling (ns, &sl);
491	elmex	1.1	}
492
493
494			/**
495			* Calls Write_To_Socket to send data to the client.
496			*
497			* The only difference in this function is that we take a SockList
498			*, and we prepend the length information.
499			*/
500	root	1.5	void
501			Send_With_Handling (NewSocket * ns, SockList * msg)
502	elmex	1.1	{
503	root	1.5	unsigned char sbuf[4];
504	elmex	1.1
505	root	1.5	if (ns->status == Ns_Dead \|\| !msg)
506			return;
507	elmex	1.1
508	root	1.5	if (msg->len >= MAXSOCKBUF)
509			{
510			LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);
511			/* Almost certainly we've overflowed a buffer, so quite now to make
512			* it easier to debug.
513			*/
514			abort ();
515			}
516			sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
517			sbuf[1] = ((uint32) (msg->len)) & 0xFF;
518			if (ns->status != Ns_Old)
519			Write_To_Socket (ns, (char *) sbuf, 2);
520			Write_To_Socket (ns, (char *) msg->buf, msg->len);
521	elmex	1.1	}
522
523			/**
524			* Takes a string of data, and writes it out to the socket. A very handy
525			* shortcut function.
526			*/
527	root	1.5	void
528			Write_String_To_Socket (NewSocket * ns, char *buf, int len)
529	elmex	1.1	{
530	root	1.5	SockList sl;
531	elmex	1.1
532	root	1.5	sl.len = len;
533			sl.buf = (unsigned char *) buf;
534			Send_With_Handling (ns, &sl);
535	elmex	1.1	}
536
537
538			/******************************************************************************
539			*
540			* statistics logging functions.
541			*
542			******************************************************************************/
543
544			#ifdef CS_LOGSTATS
545	root	1.5
546	elmex	1.1	/* cst_tot is for the life of the server, cst_last is for the last series of
547			* stats
548			*/
549			CS_Stats cst_tot, cst_lst;
550
551			/**
552			* Writes out the gathered stats. We clear cst_lst.
553			*/
554	root	1.5	void
555			write_cs_stats (void)
556	elmex	1.1	{
557	root	1.5	time_t now = time (NULL);
558	elmex	1.1
559	root	1.5	/* If no connections recently, don't both to log anything */
560			if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561			return;
562
563			/* CSSTAT is put in so scripts can easily find the line */
564			LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
565			ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
566			now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
567			cst_lst.ibytes = 0;
568			cst_lst.obytes = 0;
569			cst_lst.max_conn = socket_info.nconns;
570			cst_lst.time_start = now;
571	elmex	1.1	}
572			#endif