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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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#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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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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* 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 (v.len) |
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{ |
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memcpy (buf + len, v.ptr, v.len); |
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len += v.len; |
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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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va_list ap; |
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va_start (ap, format); |
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|
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len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); |
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|
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va_end (ap); |
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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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NewSocket::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", 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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NewSocket::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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|
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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; |
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|
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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; |
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} |
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|
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#ifndef __GNU__ /* This caused problems on Hurd */ |
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if (!ns->can_write) |
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{ |
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add_to_buffer (ns, buf, len); |
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return; |
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} |
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#endif |
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/* If we manage to write more than we wanted, take it as a bonus */ |
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while (len > 0) |
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{ |
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|
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do |
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{ |
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amt = write (ns->fd, pos, len); |
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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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if (errno != EWOULDBLOCK) |
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{ |
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LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
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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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add_to_buffer (ns, pos, len); |
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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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/* amt gets set to 0 above in blocking code, so we do this as |
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* an else if to make sure we don't reprocess it. |
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*/ |
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else if (amt == 0) |
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{ |
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LOG (llevError, "Write_To_Socket: No data written out.\n"); |
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} |
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len -= amt; |
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pos += 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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} |
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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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|
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void |
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NewSocket::send_packet (packet &sl) |
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{ |
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Send_With_Handling (this, &sl); |
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} |
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|
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void |
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NewSocket::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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} |
| 384 |
|
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void |
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NewSocket::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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* Calls Write_To_Socket to send data to the client. |
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* |
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* The only difference in this function is that we take a packet |
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*, and we prepend the length information. |
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*/ |
| 397 |
void |
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Send_With_Handling (NewSocket *ns, packet *msg) |
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{ |
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unsigned char sbuf[4]; |
| 401 |
|
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if (ns->status == Ns_Dead || !msg) |
| 403 |
return; |
| 404 |
|
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if (msg->len >= MAXSOCKBUF) |
| 406 |
{ |
| 407 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); |
| 408 |
/* Almost certainly we've overflowed a buffer, so quite now to make |
| 409 |
* it easier to debug. |
| 410 |
*/ |
| 411 |
abort (); |
| 412 |
} |
| 413 |
sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; |
| 414 |
sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
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if (ns->status != Ns_Old) |
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Write_To_Socket (ns, (char *) sbuf, 2); |
| 417 |
Write_To_Socket (ns, (char *) msg->buf, msg->len); |
| 418 |
} |
| 419 |
|
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/****************************************************************************** |
| 421 |
* |
| 422 |
* statistics logging functions. |
| 423 |
* |
| 424 |
******************************************************************************/ |
| 425 |
|
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#ifdef CS_LOGSTATS |
| 427 |
|
| 428 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
| 429 |
* stats |
| 430 |
*/ |
| 431 |
CS_Stats cst_tot, cst_lst; |
| 432 |
|
| 433 |
/** |
| 434 |
* Writes out the gathered stats. We clear cst_lst. |
| 435 |
*/ |
| 436 |
void |
| 437 |
write_cs_stats (void) |
| 438 |
{ |
| 439 |
time_t now = time (NULL); |
| 440 |
|
| 441 |
/* If no connections recently, don't both to log anything */ |
| 442 |
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
| 443 |
return; |
| 444 |
|
| 445 |
/* CSSTAT is put in so scripts can easily find the line */ |
| 446 |
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
| 447 |
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
| 448 |
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
| 449 |
cst_lst.ibytes = 0; |
| 450 |
cst_lst.obytes = 0; |
| 451 |
cst_lst.max_conn = socket_info.nconns; |
| 452 |
cst_lst.time_start = now; |
| 453 |
} |
| 454 |
#endif |
| 455 |
|
