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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 <sproto.h> |
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#include <cstdarg> |
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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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client::flush () |
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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 (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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rtt = tcpi.tcpi_rtt; |
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rttvar = tcpi.tcpi_rttvar; |
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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", 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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status = Ns_Dead; |
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} |
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} |
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#endif |
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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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|
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if (!outputbuffer.len || socket_ev.poll () & PE_W) |
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return; |
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|
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write_outputbuffer (); |
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} |
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|
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void |
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client::write_outputbuffer () |
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{ |
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while (outputbuffer.len) |
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{ |
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int res = write (fd, outputbuffer.data + outputbuffer.start, |
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min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); |
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|
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if (res > 0) |
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{ |
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outputbuffer.start += res; |
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/* wrap back to start of buffer */ |
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if (outputbuffer.start == SOCKETBUFSIZE) |
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outputbuffer.start = 0; |
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|
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outputbuffer.len -= res; |
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#ifdef CS_LOGSTATS |
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cst_tot.obytes += res; |
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cst_lst.obytes += res; |
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#endif |
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} |
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else if (res == 0) |
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{ |
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LOG (llevError, "socket write failed, connection closed.\n"); |
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status = Ns_Dead; |
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return; |
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} |
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else if (errno == EINTR) |
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{ |
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// just retry |
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} |
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else if (errno == EAGAIN) |
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{ |
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// delay till ready |
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socket_ev.poll (socket_ev.poll () | PE_W); |
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socket_ev.start (); |
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return; |
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} |
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else |
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{ |
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LOG (llevError, "socket write failed: %s\n", strerror (errno)); |
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status = Ns_Dead; |
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return; |
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} |
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} |
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|
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socket_ev.poll (socket_ev.poll () & ~PE_W); |
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} |
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|
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/*********************************************************************** |
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* |
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* packet functions/utilities |
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* |
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**********************************************************************/ |
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|
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packet &packet::operator <<(const data &v) |
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{ |
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if (room () < v.len) |
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reset (); |
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else |
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{ |
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if (v.len) |
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{ |
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memcpy (cur, v.ptr, v.len); |
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cur += v.len; |
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} |
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} |
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|
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return *this; |
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} |
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|
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packet &packet::operator <<(const data8 &v) |
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{ |
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unsigned int len = min (v.len, 0x00FF); |
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return *this << uint8 (len) << data (v.ptr, len); |
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} |
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|
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packet &packet::operator <<(const data16 &v) |
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{ |
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unsigned int len = min (v.len, 0xFFFF); |
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return *this << uint16 (len) << data (v.ptr, len); |
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} |
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|
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packet &packet::operator <<(const char *v) |
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{ |
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return *this << data (v, strlen (v ? v : 0)); |
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} |
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|
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void |
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packet::printf (const char *format, ...) |
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{ |
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int size = room (); |
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|
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va_list ap; |
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va_start (ap, format); |
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int len = vsnprintf ((char *)cur, size, format, ap); |
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va_end (ap); |
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|
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if (len >= size) |
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return reset (); |
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|
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cur += len; |
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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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int |
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client::read_packet () |
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{ |
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for (;;) |
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{ |
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if (inbuf_len >= 2) |
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{ |
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unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
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|
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if (inbuf_len >= 2 + pkt_len) |
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return pkt_len + 2; |
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} |
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|
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int amount = sizeof (inbuf) - inbuf_len; |
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|
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if (amount <= 0) |
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{ |
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LOG (llevError, "packet too large");//TODO |
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return -1; |
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} |
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|
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amount = read (fd, inbuf + inbuf_len, amount); |
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|
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if (!amount) |
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{ |
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status = Ns_Dead; |
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return -1; |
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} |
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else if (amount < 0) |
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{ |
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if (errno != EAGAIN && errno != EINTR) |
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{ |
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LOG (llevError, "read error: %s\n", strerror (errno)); |
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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inbuf_len += amount; |
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|
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cst_tot.ibytes += amount; |
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cst_lst.ibytes += amount; |
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} |
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} |
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|
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void |
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client::skip_packet (int len) |
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{ |
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inbuf_len -= len; |
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memmove (inbuf, inbuf + len, inbuf_len); |
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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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void |
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client::send (void *buf_, int len) |
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{ |
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char *buf = (char *)buf_; |
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char *pos = buf; |
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int amt = 0; |
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|
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if (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; |
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} |
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|
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if ((len + 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", fd); |
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status = Ns_Dead; |
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return; |
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} |
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|
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int avail, end; |
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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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end = outputbuffer.start + 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 (outputbuffer.data + end, buf, len); |
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else |
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{ |
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memcpy (outputbuffer.data + end, buf, avail); |
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memcpy (outputbuffer.data, buf + avail, len - avail); |
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} |
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|
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outputbuffer.len += len; |
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} |
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|
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void |
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client::socket_cb (iow &w, int got) |
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{ |
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write_outputbuffer (); |
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|
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if (!outputbuffer.len) |
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socket_ev.poll (socket_ev.poll () & ~PE_W); |
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} |
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|
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/** |
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* Takes a string of data, and writes it out to the socket. A very handy |
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* shortcut function. |
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*/ |
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void |
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client::send_packet (packet &sl) |
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{ |
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if (status == Ns_Dead) |
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return; |
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|
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if (sl.length () >= MAXSOCKBUF) |
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{ |
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LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
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/* Almost certainly we've overflowed a buffer, so quit now to make |
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* it easier to debug. |
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*/ |
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abort (); |
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} |
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|
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if (!sl.length ()) |
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return; |
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|
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assert (sl.hdrlen == 2); |
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|
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sl.buf_ [0] = sl.length () >> 8; |
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sl.buf_ [1] = sl.length () ; |
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|
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send (sl.buf_, sl.length () + sl.hdrlen); |
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} |
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|
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void |
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client::send_packet (const char *buf, int len) |
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{ |
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packet sl; |
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|
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sl << data (buf, len); |
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send_packet (sl); |
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} |
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|
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void |
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client::send_packet (const char *buf) |
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{ |
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send_packet (buf, strlen (buf)); |
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} |
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|
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/****************************************************************************** |
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* |
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* statistics logging functions. |
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* |
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******************************************************************************/ |
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|
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#ifdef CS_LOGSTATS |
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|
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/* cst_tot is for the life of the server, cst_last is for the last series of |
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* stats |
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*/ |
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CS_Stats cst_tot, cst_lst; |
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|
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/** |
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* Writes out the gathered stats. We clear cst_lst. |
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*/ |
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void |
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write_cs_stats (void) |
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{ |
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time_t now = time (NULL); |
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|
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/* If no connections recently, don't both to log anything */ |
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if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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return; |
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|
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/* CSSTAT is put in so scripts can easily find the line */ |
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LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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cst_lst.ibytes = 0; |
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cst_lst.obytes = 0; |
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cst_lst.time_start = now; |
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} |
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#endif |
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|