| 1 |
/* |
| 2 |
CrossFire, A Multiplayer game for X-windows |
| 3 |
|
| 4 |
Copyright (C) 1992 Frank Tore Johansen |
| 5 |
|
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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 |
| 9 |
(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 |
| 17 |
along with this program; if not, write to the Free Software |
| 18 |
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 |
| 28 |
* |
| 29 |
* Contains some base functions that both the client and server |
| 30 |
* can use. As such, depending what we are being compiled for will |
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* determine what we can include. the client is designed have |
| 32 |
* CFCLIENT defined as part of its compile flags. |
| 33 |
*/ |
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|
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using namespace std; |
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|
| 37 |
#include <global.h> |
| 38 |
#include <newclient.h> |
| 39 |
#include <sproto.h> |
| 40 |
|
| 41 |
#ifdef __linux__ |
| 42 |
# include <sys/types.h> |
| 43 |
# include <sys/socket.h> |
| 44 |
# include <netinet/in.h> |
| 45 |
# define TCP_HZ 1000 // sorry... |
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# include <netinet/tcp.h> |
| 47 |
#endif |
| 48 |
|
| 49 |
// use a really low timeout, as it doesn't cost any bandwidth, and you can |
| 50 |
// easily die in 20 seconds... |
| 51 |
#define SOCKET_TIMEOUT1 10 |
| 52 |
#define SOCKET_TIMEOUT2 20 |
| 53 |
|
| 54 |
void |
| 55 |
Socket_Flush (NewSocket * ns) |
| 56 |
{ |
| 57 |
#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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|
| 66 |
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 |
| 68 |
{ |
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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; |
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setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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val = 1; |
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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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void |
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SockList_Init (SockList * sl) |
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{ |
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sl->len = 0; |
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sl->buf = NULL; |
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} |
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|
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void |
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SockList_AddInt (SockList * sl, uint32 data) |
| 99 |
{ |
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sl->buf[sl->len++] = (data >> 24) & 0xff; |
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sl->buf[sl->len++] = (data >> 16) & 0xff; |
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sl->buf[sl->len++] = (data >> 8) & 0xff; |
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sl->buf[sl->len++] = data & 0xff; |
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} |
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|
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void |
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SockList_AddInt64 (SockList * sl, uint64 data) |
| 108 |
{ |
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sl->buf[sl->len++] = (char) ((data >> 56) & 0xff); |
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sl->buf[sl->len++] = (char) ((data >> 48) & 0xff); |
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sl->buf[sl->len++] = (char) ((data >> 40) & 0xff); |
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sl->buf[sl->len++] = (char) ((data >> 32) & 0xff); |
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|
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sl->buf[sl->len++] = (char) ((data >> 24) & 0xff); |
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sl->buf[sl->len++] = (char) ((data >> 16) & 0xff); |
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sl->buf[sl->len++] = (char) ((data >> 8) & 0xff); |
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sl->buf[sl->len++] = (char) (data & 0xff); |
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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)); |
| 218 |
} |
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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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******************************************************************************/ |
| 246 |
|
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/** |
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* Adds data to a socket buffer for whatever reason. |
| 249 |
* |
| 250 |
* 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. |
| 252 |
*/ |
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|
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static void |
| 255 |
add_to_buffer (NewSocket * ns, char *buf, int len) |
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{ |
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int avail, end; |
| 258 |
|
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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); |
| 262 |
ns->status = Ns_Dead; |
| 263 |
return; |
| 264 |
} |
| 265 |
|
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/* data + end is where we start putting the new data. The last byte |
| 267 |
* currently in use is actually data + end -1 |
| 268 |
*/ |
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|
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end = ns->outputbuffer.start + ns->outputbuffer.len; |
| 271 |
/* The buffer is already in a wrapped state, so adjust end */ |
| 272 |
if (end >= SOCKETBUFSIZE) |
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end -= SOCKETBUFSIZE; |
| 274 |
|
| 275 |
avail = SOCKETBUFSIZE - end; |
| 276 |
|
| 277 |
/* We can all fit it behind the current data without wrapping */ |
| 278 |
if (avail >= len) |
| 279 |
memcpy (ns->outputbuffer.data + end, buf, len); |
| 280 |
else |
| 281 |
{ |
| 282 |
memcpy (ns->outputbuffer.data + end, buf, avail); |
| 283 |
memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
| 284 |
} |
| 285 |
|
| 286 |
ns->outputbuffer.len += len; |
| 287 |
#if 0 |
| 288 |
LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
| 289 |
#endif |
| 290 |
} |
| 291 |
|
| 292 |
/** |
| 293 |
* Writes data to socket. |
| 294 |
* |
| 295 |
* When the socket is clear to write, and we have backlogged data, this |
| 296 |
* is called to write it out. |
| 297 |
*/ |
| 298 |
void |
| 299 |
write_socket_buffer (NewSocket * ns) |
| 300 |
{ |
| 301 |
int amt, max; |
| 302 |
|
| 303 |
if (ns->outputbuffer.len == 0) |
| 304 |
{ |
| 305 |
LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd); |
| 306 |
return; |
| 307 |
} |
| 308 |
|
| 309 |
do |
| 310 |
{ |
| 311 |
max = SOCKETBUFSIZE - ns->outputbuffer.start; |
| 312 |
if (ns->outputbuffer.len < max) |
| 313 |
max = ns->outputbuffer.len; |
| 314 |
|
| 315 |
do |
| 316 |
{ |
| 317 |
amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
| 318 |
} |
| 319 |
while ((amt < 0) && (errno == EINTR)); |
| 320 |
|
| 321 |
if (amt < 0) |
| 322 |
{ /* We got an error */ |
| 323 |
|
| 324 |
if (errno != EWOULDBLOCK) |
| 325 |
{ |
| 326 |
LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
| 327 |
ns->status = Ns_Dead; |
| 328 |
return; |
| 329 |
} |
| 330 |
else |
| 331 |
{ /* EWOULDBLOCK */ |
| 332 |
/* can't write it, so store it away. */ |
| 333 |
ns->can_write = 0; |
| 334 |
return; |
| 335 |
} |
| 336 |
} |
| 337 |
ns->outputbuffer.start += amt; |
| 338 |
/* wrap back to start of buffer */ |
| 339 |
if (ns->outputbuffer.start == SOCKETBUFSIZE) |
| 340 |
ns->outputbuffer.start = 0; |
| 341 |
ns->outputbuffer.len -= amt; |
| 342 |
#ifdef CS_LOGSTATS |
| 343 |
cst_tot.obytes += amt; |
| 344 |
cst_lst.obytes += amt; |
| 345 |
#endif |
| 346 |
} |
| 347 |
while (ns->outputbuffer.len > 0); |
| 348 |
} |
| 349 |
|
| 350 |
/** |
| 351 |
* This writes data to the socket. - It is very low level - |
| 352 |
* all we try and do is write out the data to the socket |
| 353 |
* provided (ns). buf is the data to write, len is the number |
| 354 |
* of bytes to write. IT doesn't return anything - rather, it |
| 355 |
* updates the ns structure if we get an error. |
| 356 |
*/ |
| 357 |
void |
| 358 |
Write_To_Socket (NewSocket * ns, char *buf, int len) |
| 359 |
{ |
| 360 |
int amt = 0; |
| 361 |
char *pos = buf; |
| 362 |
|
| 363 |
if (ns->status == Ns_Dead || !buf) |
| 364 |
{ |
| 365 |
LOG (llevDebug, "Write_To_Socket called with dead socket\n"); |
| 366 |
return; |
| 367 |
} |
| 368 |
|
| 369 |
#ifndef __GNU__ /* This caused problems on Hurd */ |
| 370 |
if (!ns->can_write) |
| 371 |
{ |
| 372 |
add_to_buffer (ns, buf, len); |
| 373 |
return; |
| 374 |
} |
| 375 |
#endif |
| 376 |
/* If we manage to write more than we wanted, take it as a bonus */ |
| 377 |
while (len > 0) |
| 378 |
{ |
| 379 |
|
| 380 |
do |
| 381 |
{ |
| 382 |
amt = write (ns->fd, pos, len); |
| 383 |
} |
| 384 |
while ((amt < 0) && (errno == EINTR)); |
| 385 |
|
| 386 |
if (amt < 0) |
| 387 |
{ /* We got an error */ |
| 388 |
if (errno != EWOULDBLOCK) |
| 389 |
{ |
| 390 |
LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
| 391 |
errno, strerror (errno)); |
| 392 |
ns->status = Ns_Dead; |
| 393 |
return; |
| 394 |
} |
| 395 |
else |
| 396 |
{ /* EWOULDBLOCK */ |
| 397 |
/* can't write it, so store it away. */ |
| 398 |
add_to_buffer (ns, pos, len); |
| 399 |
ns->can_write = 0; |
| 400 |
return; |
| 401 |
} |
| 402 |
} |
| 403 |
/* amt gets set to 0 above in blocking code, so we do this as |
| 404 |
* an else if to make sure we don't reprocess it. |
| 405 |
*/ |
| 406 |
else if (amt == 0) |
| 407 |
{ |
| 408 |
LOG (llevError, "Write_To_Socket: No data written out.\n"); |
| 409 |
} |
| 410 |
len -= amt; |
| 411 |
pos += amt; |
| 412 |
#ifdef CS_LOGSTATS |
| 413 |
cst_tot.obytes += amt; |
| 414 |
cst_lst.obytes += amt; |
| 415 |
#endif |
| 416 |
} |
| 417 |
} |
| 418 |
|
| 419 |
|
| 420 |
/** |
| 421 |
* Takes a string of data, and writes it out to the socket. A very handy |
| 422 |
* shortcut function. |
| 423 |
*/ |
| 424 |
void |
| 425 |
cs_write_string (NewSocket * ns, const char *buf, int len) |
| 426 |
{ |
| 427 |
SockList sl; |
| 428 |
|
| 429 |
sl.len = len; |
| 430 |
sl.buf = (unsigned char *) buf; |
| 431 |
Send_With_Handling (ns, &sl); |
| 432 |
} |
| 433 |
|
| 434 |
|
| 435 |
/** |
| 436 |
* Calls Write_To_Socket to send data to the client. |
| 437 |
* |
| 438 |
* The only difference in this function is that we take a SockList |
| 439 |
*, and we prepend the length information. |
| 440 |
*/ |
| 441 |
void |
| 442 |
Send_With_Handling (NewSocket * ns, SockList * msg) |
| 443 |
{ |
| 444 |
unsigned char sbuf[4]; |
| 445 |
|
| 446 |
if (ns->status == Ns_Dead || !msg) |
| 447 |
return; |
| 448 |
|
| 449 |
if (msg->len >= MAXSOCKBUF) |
| 450 |
{ |
| 451 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); |
| 452 |
/* Almost certainly we've overflowed a buffer, so quite now to make |
| 453 |
* it easier to debug. |
| 454 |
*/ |
| 455 |
abort (); |
| 456 |
} |
| 457 |
sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; |
| 458 |
sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
| 459 |
if (ns->status != Ns_Old) |
| 460 |
Write_To_Socket (ns, (char *) sbuf, 2); |
| 461 |
Write_To_Socket (ns, (char *) msg->buf, msg->len); |
| 462 |
} |
| 463 |
|
| 464 |
/** |
| 465 |
* Takes a string of data, and writes it out to the socket. A very handy |
| 466 |
* shortcut function. |
| 467 |
*/ |
| 468 |
void |
| 469 |
Write_String_To_Socket (NewSocket * ns, char *buf, int len) |
| 470 |
{ |
| 471 |
SockList sl; |
| 472 |
|
| 473 |
sl.len = len; |
| 474 |
sl.buf = (unsigned char *) buf; |
| 475 |
Send_With_Handling (ns, &sl); |
| 476 |
} |
| 477 |
|
| 478 |
|
| 479 |
/****************************************************************************** |
| 480 |
* |
| 481 |
* statistics logging functions. |
| 482 |
* |
| 483 |
******************************************************************************/ |
| 484 |
|
| 485 |
#ifdef CS_LOGSTATS |
| 486 |
|
| 487 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
| 488 |
* stats |
| 489 |
*/ |
| 490 |
CS_Stats cst_tot, cst_lst; |
| 491 |
|
| 492 |
/** |
| 493 |
* Writes out the gathered stats. We clear cst_lst. |
| 494 |
*/ |
| 495 |
void |
| 496 |
write_cs_stats (void) |
| 497 |
{ |
| 498 |
time_t now = time (NULL); |
| 499 |
|
| 500 |
/* If no connections recently, don't both to log anything */ |
| 501 |
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
| 502 |
return; |
| 503 |
|
| 504 |
/* CSSTAT is put in so scripts can easily find the line */ |
| 505 |
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
| 506 |
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
| 507 |
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
| 508 |
cst_lst.ibytes = 0; |
| 509 |
cst_lst.obytes = 0; |
| 510 |
cst_lst.max_conn = socket_info.nconns; |
| 511 |
cst_lst.time_start = now; |
| 512 |
} |
| 513 |
#endif |
