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/* |
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CrossFire, A Multiplayer game for X-windows |
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|
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Copyright (C) 1992 Frank Tore Johansen |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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|
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The author can be reached via e-mail to mark@pyramid.com |
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*/ |
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|
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/** |
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* \file |
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* Low-level socket-related functions. |
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* |
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* \date 2003-12-02 |
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* |
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* Contains some base functions that both the client and server |
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* can use. As such, depending what we are being compiled for will |
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* determine what we can include. the client is designed have |
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* CFCLIENT defined as part of its compile flags. |
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*/ |
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|
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using namespace std; |
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|
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#include <global.h> |
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#include <newclient.h> |
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#include <sproto.h> |
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|
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#ifdef __linux__ |
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# include <sys/types.h> |
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# include <sys/socket.h> |
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# include <netinet/in.h> |
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# define TCP_HZ 1000 // sorry... |
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# include <netinet/tcp.h> |
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#endif |
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|
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// use a really low timeout, as it doesn't cost any bandwidth, and you can |
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// easily die in 20 seconds... |
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#define SOCKET_TIMEOUT1 10 |
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#define SOCKET_TIMEOUT2 20 |
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|
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void |
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Socket_Flush (NewSocket * ns) |
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{ |
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#ifdef __linux__ |
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// check time of last ack, and, if too old, kill connection |
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struct tcp_info tcpi; |
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socklen_t len = sizeof (tcpi); |
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|
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if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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{ |
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unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
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|
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if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s |
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&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s |
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{ |
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LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, |
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(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
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ns->status = Ns_Dead; |
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} |
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} |
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|
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int val; |
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|
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val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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#endif |
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} |
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|
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/*********************************************************************** |
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* |
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* SockList functions/utilities |
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* |
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**********************************************************************/ |
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|
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SockList &SockList::operator <<(const data8 &v) |
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{ |
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*this << uint8 (v.len); |
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|
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memcpy (buf + len, v.data, v.len); |
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len += v.len; |
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|
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return *this; |
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} |
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|
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SockList &SockList::operator <<(const data16 &v) |
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{ |
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*this << uint16 (v.len); |
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|
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memcpy (buf + len, v.data, v.len); |
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len += v.len; |
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|
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return *this; |
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} |
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|
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/* Basically does the reverse of SockList_AddInt, but on |
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* strings instead. Same for the GetShort, but for 16 bits. |
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*/ |
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int |
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GetInt_String (unsigned char *data) |
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{ |
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return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]); |
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} |
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|
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short |
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GetShort_String (unsigned char *data) |
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{ |
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return ((data[0] << 8) + data[1]); |
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} |
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|
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/****************************************************************************** |
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* |
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* Start of read routines. |
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* |
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******************************************************************************/ |
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|
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/** |
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* This reads from fd and puts the data in sl. We return true if we think |
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* we have a full packet, 0 if we have a partial packet. The only processing |
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* we do is remove the intial size value. len (As passed) is the size of the |
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* buffer allocated in the socklist. We make the assumption the buffer is |
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* at least 2 bytes long. |
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*/ |
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|
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int |
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SockList_ReadPacket (int fd, SockList * sl, int len) |
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{ |
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int stat, toread; |
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|
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/* Sanity check - shouldn't happen */ |
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if (sl->len < 0) |
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{ |
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abort (); |
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} |
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/* We already have a partial packet */ |
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if (sl->len < 2) |
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{ |
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do |
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{ |
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stat = read (fd, sl->buf + sl->len, 2 - sl->len); |
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} |
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while ((stat == -1) && (errno == EINTR)); |
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|
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if (stat < 0) |
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{ |
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/* In non blocking mode, EAGAIN is set when there is no |
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* data available. |
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*/ |
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if (errno != EAGAIN && errno != EWOULDBLOCK) |
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{ |
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LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
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} |
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return 0; /*Error */ |
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} |
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if (stat == 0) |
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return -1; |
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sl->len += stat; |
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#ifdef CS_LOGSTATS |
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cst_tot.ibytes += stat; |
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cst_lst.ibytes += stat; |
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#endif |
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if (stat < 2) |
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return 0; /* Still don't have a full packet */ |
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} |
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/* Figure out how much more data we need to read. Add 2 from the |
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* end of this - size header information is not included. |
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*/ |
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toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len; |
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if ((toread + sl->len) >= len) |
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{ |
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LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len); |
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/* Quick hack in case for 'oldsocketmode' input. If we are |
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* closing the socket anyways, then reading this extra 100 bytes |
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* shouldn't hurt. |
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*/ |
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read (fd, sl->buf + 2, 100); |
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|
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/* return error so the socket is closed */ |
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return -1; |
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} |
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do |
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{ |
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do |
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{ |
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stat = read (fd, sl->buf + sl->len, toread); |
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} |
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while ((stat < 0) && (errno == EINTR)); |
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if (stat < 0) |
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{ |
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|
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if (errno != EAGAIN && errno != EWOULDBLOCK) |
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{ |
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LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
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} |
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return 0; /*Error */ |
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} |
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if (stat == 0) |
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return -1; |
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sl->len += stat; |
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#ifdef CS_LOGSTATS |
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cst_tot.ibytes += stat; |
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cst_lst.ibytes += stat; |
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#endif |
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toread -= stat; |
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if (toread == 0) |
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return 1; |
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if (toread < 0) |
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{ |
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LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n"); |
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return 1; |
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} |
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} |
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while (toread > 0); |
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return 0; |
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} |
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|
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/******************************************************************************* |
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* |
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* Start of write related routines. |
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* |
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******************************************************************************/ |
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|
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/** |
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* Adds data to a socket buffer for whatever reason. |
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* |
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* ns is the socket we are adding the data to, buf is the start of the |
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* data, and len is the number of bytes to add. |
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*/ |
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|
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static void |
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add_to_buffer (NewSocket * ns, char *buf, int len) |
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{ |
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int avail, end; |
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|
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if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
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{ |
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LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd); |
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ns->status = Ns_Dead; |
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return; |
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} |
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|
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/* data + end is where we start putting the new data. The last byte |
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* currently in use is actually data + end -1 |
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*/ |
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|
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end = ns->outputbuffer.start + ns->outputbuffer.len; |
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/* The buffer is already in a wrapped state, so adjust end */ |
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if (end >= SOCKETBUFSIZE) |
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end -= SOCKETBUFSIZE; |
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|
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avail = SOCKETBUFSIZE - end; |
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|
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/* We can all fit it behind the current data without wrapping */ |
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if (avail >= len) |
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memcpy (ns->outputbuffer.data + end, buf, len); |
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else |
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{ |
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memcpy (ns->outputbuffer.data + end, buf, avail); |
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memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
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} |
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|
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ns->outputbuffer.len += len; |
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#if 0 |
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LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
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#endif |
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} |
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|
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/** |
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* Writes data to socket. |
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* |
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* When the socket is clear to write, and we have backlogged data, this |
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* is called to write it out. |
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*/ |
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void |
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write_socket_buffer (NewSocket * ns) |
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{ |
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int amt, max; |
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|
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if (ns->outputbuffer.len == 0) |
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{ |
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LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd); |
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return; |
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} |
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|
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do |
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{ |
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max = SOCKETBUFSIZE - ns->outputbuffer.start; |
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if (ns->outputbuffer.len < max) |
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max = ns->outputbuffer.len; |
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|
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do |
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{ |
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amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
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} |
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while ((amt < 0) && (errno == EINTR)); |
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|
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if (amt < 0) |
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{ /* We got an error */ |
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|
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if (errno != EWOULDBLOCK) |
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{ |
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LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
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ns->status = Ns_Dead; |
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return; |
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} |
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else |
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{ /* EWOULDBLOCK */ |
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/* can't write it, so store it away. */ |
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ns->can_write = 0; |
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return; |
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} |
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} |
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ns->outputbuffer.start += amt; |
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/* wrap back to start of buffer */ |
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if (ns->outputbuffer.start == SOCKETBUFSIZE) |
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ns->outputbuffer.start = 0; |
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ns->outputbuffer.len -= amt; |
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#ifdef CS_LOGSTATS |
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cst_tot.obytes += amt; |
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cst_lst.obytes += amt; |
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#endif |
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} |
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while (ns->outputbuffer.len > 0); |
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} |
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|
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/** |
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* This writes data to the socket. - It is very low level - |
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* all we try and do is write out the data to the socket |
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* provided (ns). buf is the data to write, len is the number |
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* of bytes to write. IT doesn't return anything - rather, it |
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* updates the ns structure if we get an error. |
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*/ |
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void |
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Write_To_Socket (NewSocket * ns, char *buf, int len) |
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{ |
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int amt = 0; |
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char *pos = buf; |
350 |
|
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if (ns->status == Ns_Dead || !buf) |
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{ |
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LOG (llevDebug, "Write_To_Socket called with dead socket\n"); |
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return; |
355 |
} |
356 |
|
357 |
#ifndef __GNU__ /* This caused problems on Hurd */ |
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if (!ns->can_write) |
359 |
{ |
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add_to_buffer (ns, buf, len); |
361 |
return; |
362 |
} |
363 |
#endif |
364 |
/* If we manage to write more than we wanted, take it as a bonus */ |
365 |
while (len > 0) |
366 |
{ |
367 |
|
368 |
do |
369 |
{ |
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amt = write (ns->fd, pos, len); |
371 |
} |
372 |
while ((amt < 0) && (errno == EINTR)); |
373 |
|
374 |
if (amt < 0) |
375 |
{ /* We got an error */ |
376 |
if (errno != EWOULDBLOCK) |
377 |
{ |
378 |
LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
379 |
errno, strerror (errno)); |
380 |
ns->status = Ns_Dead; |
381 |
return; |
382 |
} |
383 |
else |
384 |
{ /* EWOULDBLOCK */ |
385 |
/* can't write it, so store it away. */ |
386 |
add_to_buffer (ns, pos, len); |
387 |
ns->can_write = 0; |
388 |
return; |
389 |
} |
390 |
} |
391 |
/* amt gets set to 0 above in blocking code, so we do this as |
392 |
* an else if to make sure we don't reprocess it. |
393 |
*/ |
394 |
else if (amt == 0) |
395 |
{ |
396 |
LOG (llevError, "Write_To_Socket: No data written out.\n"); |
397 |
} |
398 |
len -= amt; |
399 |
pos += amt; |
400 |
#ifdef CS_LOGSTATS |
401 |
cst_tot.obytes += amt; |
402 |
cst_lst.obytes += amt; |
403 |
#endif |
404 |
} |
405 |
} |
406 |
|
407 |
|
408 |
/** |
409 |
* Takes a string of data, and writes it out to the socket. A very handy |
410 |
* shortcut function. |
411 |
*/ |
412 |
void |
413 |
cs_write_string (NewSocket * ns, const char *buf, int len) |
414 |
{ |
415 |
SockList sl; |
416 |
|
417 |
sl.len = len; |
418 |
sl.buf = (unsigned char *) buf; |
419 |
Send_With_Handling (ns, &sl); |
420 |
} |
421 |
|
422 |
|
423 |
/** |
424 |
* Calls Write_To_Socket to send data to the client. |
425 |
* |
426 |
* The only difference in this function is that we take a SockList |
427 |
*, and we prepend the length information. |
428 |
*/ |
429 |
void |
430 |
Send_With_Handling (NewSocket * ns, SockList * msg) |
431 |
{ |
432 |
unsigned char sbuf[4]; |
433 |
|
434 |
if (ns->status == Ns_Dead || !msg) |
435 |
return; |
436 |
|
437 |
if (msg->len >= MAXSOCKBUF) |
438 |
{ |
439 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); |
440 |
/* Almost certainly we've overflowed a buffer, so quite now to make |
441 |
* it easier to debug. |
442 |
*/ |
443 |
abort (); |
444 |
} |
445 |
sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; |
446 |
sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
447 |
if (ns->status != Ns_Old) |
448 |
Write_To_Socket (ns, (char *) sbuf, 2); |
449 |
Write_To_Socket (ns, (char *) msg->buf, msg->len); |
450 |
} |
451 |
|
452 |
/** |
453 |
* Takes a string of data, and writes it out to the socket. A very handy |
454 |
* shortcut function. |
455 |
*/ |
456 |
void |
457 |
Write_String_To_Socket (NewSocket * ns, char *buf, int len) |
458 |
{ |
459 |
SockList sl; |
460 |
|
461 |
sl.len = len; |
462 |
sl.buf = (unsigned char *) buf; |
463 |
Send_With_Handling (ns, &sl); |
464 |
} |
465 |
|
466 |
|
467 |
/****************************************************************************** |
468 |
* |
469 |
* statistics logging functions. |
470 |
* |
471 |
******************************************************************************/ |
472 |
|
473 |
#ifdef CS_LOGSTATS |
474 |
|
475 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
476 |
* stats |
477 |
*/ |
478 |
CS_Stats cst_tot, cst_lst; |
479 |
|
480 |
/** |
481 |
* Writes out the gathered stats. We clear cst_lst. |
482 |
*/ |
483 |
void |
484 |
write_cs_stats (void) |
485 |
{ |
486 |
time_t now = time (NULL); |
487 |
|
488 |
/* If no connections recently, don't both to log anything */ |
489 |
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
490 |
return; |
491 |
|
492 |
/* CSSTAT is put in so scripts can easily find the line */ |
493 |
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
494 |
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
495 |
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
496 |
cst_lst.ibytes = 0; |
497 |
cst_lst.obytes = 0; |
498 |
cst_lst.max_conn = socket_info.nconns; |
499 |
cst_lst.time_start = now; |
500 |
} |
501 |
#endif |
502 |
|