mirror of
git://xwords.git.sourceforge.net/gitroot/xwords/xwords
synced 2025-01-07 05:24:46 +01:00
c10a3a7340
change the set listened on. There's still some debugging to do but nothing that worked before is broken. Also begin to accept unique prefixes (e.g. g for get) for commands and attributes on the control port. Note that relay-related code in comms seems broken now, but is without this checkin.
726 lines
20 KiB
C++
726 lines
20 KiB
C++
/* -*-mode: C; fill-column: 78; c-basic-offset: 4; -*- */
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/*
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* Copyright 2005 by Eric House (xwords@eehouse.org). All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//////////////////////////////////////////////////////////////////////////////
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//
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// This program is a *very rough* cut at a message forwarding server that's
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// meant to sit somewhere that cellphones can reach and forward packets across
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// connections so that they can communicate. It exists to work around the
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// fact that many cellular carriers prevent direct incoming connections from
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// reaching devices on their networks. It's meant for Crosswords, but might
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// be useful for other things. It also needs a lot of work, and I hacked it
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// up before making an exhaustive search for other alternatives.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <unistd.h>
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#include <netdb.h> /* gethostbyname */
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#include <errno.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include <assert.h>
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#include <sys/select.h>
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#include <stdarg.h>
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#include <syslog.h>
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#include <sys/wait.h>
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#include <sys/prctl.h>
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#if defined(__FreeBSD__)
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# if (OSVERSION > 500000)
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# include "getopt.h"
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# else
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# include "unistd.h"
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# endif
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#else
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# include <getopt.h>
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#endif
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#include <sys/time.h>
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#include "xwrelay.h"
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#include "crefmgr.h"
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#include "ctrl.h"
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#include "mlock.h"
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#include "tpool.h"
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#include "configs.h"
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#include "timermgr.h"
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#include "permid.h"
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#include "lstnrmgr.h"
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#define LOG_FILE_PATH "./xwrelay.log"
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void
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logf( XW_LogLevel level, const char* format, ... )
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{
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RelayConfigs* rc = RelayConfigs::GetConfigs();
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if ( NULL == rc || level <= rc->GetLogLevel() ) {
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#ifdef USE_SYSLOG
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char buf[256];
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va_list ap;
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va_start( ap, format );
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vsnprintf( buf, sizeof(buf), format, ap );
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syslog( LOG_LOCAL0 | LOG_INFO, buf );
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va_end(ap);
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#else
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static FILE* where = stderr;
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struct tm* timp;
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struct timeval tv;
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struct timezone tz;
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if ( !where ) {
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where = fopen( LOG_FILE_PATH, "a" );
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}
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gettimeofday( &tv, &tz );
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timp = localtime( &tv.tv_sec );
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pthread_t me = pthread_self();
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fprintf( where, "<%p>%d:%d:%d: ", (void*)me, timp->tm_hour,
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timp->tm_min, timp->tm_sec );
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va_list ap;
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va_start( ap, format );
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vfprintf( where, format, ap );
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va_end(ap);
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fprintf( where, "\n" );
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#endif
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}
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} /* logf */
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static int
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getNetShort( unsigned char** bufpp, unsigned char* end, unsigned short* out )
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{
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int ok = *bufpp + 2 <= end;
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if ( ok ) {
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unsigned short tmp;
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memcpy( &tmp, *bufpp, 2 );
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*bufpp += 2;
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*out = ntohs( tmp );
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}
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return ok;
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} /* getNetShort */
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static int
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getNetByte( unsigned char** bufpp, unsigned char* end, unsigned char* out )
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{
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int ok = *bufpp < end;
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if ( ok ) {
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*out = **bufpp;
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++*bufpp;
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}
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return ok;
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} /* getNetByte */
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#ifdef RELAY_HEARTBEAT
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static int
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processHeartbeat( unsigned char* buf, int bufLen, int socket )
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{
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unsigned char* end = buf + bufLen;
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CookieID cookieID;
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HostID hostID;
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int success = 0;
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if ( getNetShort( &buf, end, &cookieID )
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&& getNetByte( &buf, end, &hostID ) ) {
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logf( XW_LOGINFO, "processHeartbeat: cookieID 0x%lx, hostID 0x%x",
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cookieID, hostID );
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SafeCref scr( cookieID );
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success = scr.HandleHeartbeat( hostID, socket );
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if ( !success ) {
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killSocket( socket, "no cref for socket" );
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}
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}
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return success;
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} /* processHeartbeat */
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#endif
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static int
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readStr( unsigned char** bufp, const unsigned char* end,
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char* outBuf, int bufLen )
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{
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unsigned char clen = **bufp;
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++*bufp;
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if ( ((*bufp + clen) <= end) && (clen < bufLen) ) {
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memcpy( outBuf, *bufp, clen );
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outBuf[clen] = '\0';
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*bufp += clen;
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return 1;
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}
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return 0;
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} /* readStr */
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static XWREASON
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flagsOK( unsigned char flags )
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{
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return flags == XWRELAY_PROTO_VERSION ?
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XWRELAY_ERROR_NONE : XWRELAY_ERROR_OLDFLAGS;
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} /* flagsOK */
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static void
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denyConnection( int socket, XWREASON err )
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{
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unsigned char buf[2];
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buf[0] = XWRELAY_CONNECTDENIED;
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buf[1] = err;
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send_with_length_unsafe( socket, buf, sizeof(buf) );
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}
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/* No mutex here. Caller better be ensuring no other thread can access this
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* socket. */
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int
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send_with_length_unsafe( int socket, unsigned char* buf, int bufLen )
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{
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int ok = 0;
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unsigned short len = htons( bufLen );
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ssize_t nSent = send( socket, &len, 2, 0 );
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if ( nSent == 2 ) {
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nSent = send( socket, buf, bufLen, 0 );
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if ( nSent == bufLen ) {
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logf( XW_LOGINFO, "sent %d bytes on socket %d", nSent, socket );
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ok = 1;
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}
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}
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return ok;
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} /* send_with_length_unsafe */
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/* A CONNECT message from a device gives us the hostID and socket we'll
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* associate with one participant in a relayed session. We'll store this
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* information with the cookie where other participants can find it when they
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* arrive.
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*
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* What to do if we already have a game going? In that case the connection ID
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* passed in will be non-zero. If the device can be associated with an
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* ongoing game, with its new socket, associate it and forward any messages
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* outstanding. Otherwise close down the socket. And maybe the others in the
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* game?
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*/
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static int
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processConnect( unsigned char* bufp, int bufLen, int socket )
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{
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char cookie[MAX_COOKIE_LEN+1];
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unsigned char* end = bufp + bufLen;
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int success = 0;
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logf( XW_LOGINFO, "processConnect" );
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cookie[0] = '\0';
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unsigned char flags = *bufp++;
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XWREASON err = flagsOK( flags );
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if ( err != XWRELAY_ERROR_NONE ) {
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denyConnection( socket, err );
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} else {
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HostID srcID;
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unsigned char nPlayersH;
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unsigned char nPlayersT;
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if ( readStr( &bufp, end, cookie, sizeof(cookie) )
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&& getNetByte( &bufp, end, &srcID )
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&& getNetByte( &bufp, end, &nPlayersH )
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&& getNetByte( &bufp, end, &nPlayersT ) ) {
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SafeCref scr( cookie, 1, srcID, nPlayersH, nPlayersT );
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success = scr.Connect( socket, srcID, nPlayersH, nPlayersT );
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}
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if ( !success ) {
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denyConnection( socket, XWRELAY_ERROR_BADPROTO );
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}
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}
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return success;
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} /* processConnect */
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static int
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processReconnect( unsigned char* bufp, int bufLen, int socket )
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{
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unsigned char* end = bufp + bufLen;
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int success = 0;
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logf( XW_LOGINFO, "processReconnect" );
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unsigned char flags = *bufp++;
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XWREASON err = flagsOK( flags );
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if ( err != XWRELAY_ERROR_NONE ) {
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denyConnection( socket, err );
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} else {
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char connName[MAX_CONNNAME_LEN+1];
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HostID srcID;
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unsigned char nPlayersH;
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unsigned char nPlayersT;
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connName[0] = '\0';
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if ( getNetByte( &bufp, end, &srcID )
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&& getNetByte( &bufp, end, &nPlayersH )
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&& getNetByte( &bufp, end, &nPlayersT )
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&& readStr( &bufp, end, connName, sizeof(connName) ) ) {
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SafeCref scr( connName, 0, srcID, nPlayersH, nPlayersT );
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success = scr.Reconnect( socket, srcID, nPlayersH, nPlayersT );
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}
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if ( !success ) {
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denyConnection( socket, XWRELAY_ERROR_BADPROTO );
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}
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}
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return success;
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} /* processReconnect */
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static int
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processDisconnect( unsigned char* bufp, int bufLen, int socket )
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{
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unsigned char* end = bufp + bufLen;
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CookieID cookieID;
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HostID hostID;
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int success = 0;
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if ( getNetShort( &bufp, end, &cookieID )
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&& getNetByte( &bufp, end, &hostID ) ) {
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SafeCref scr( cookieID );
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scr.Disconnect( socket, hostID );
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success = 1;
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} else {
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logf( XW_LOGERROR, "dropping XWRELAY_GAME_DISCONNECT; wrong length" );
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}
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return success;
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} /* processDisconnect */
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void
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killSocket( int socket, const char* why )
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{
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logf( XW_LOGERROR, "killSocket(%d): %s", socket, why );
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CRefMgr::Get()->RemoveSocketRefs( socket );
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/* Might want to kill the thread it belongs to if we're not in it,
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e.g. when unable to write to another socket. */
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logf( XW_LOGINFO, "killSocket done" );
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XWThreadPool::GetTPool()->CloseSocket( socket );
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}
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time_t
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now()
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{
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static time_t startTime = time(NULL);
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return time(NULL) - startTime;
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}
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/* forward the message. Need only change the command after looking up the
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* socket and it's ready to go. */
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static int
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forwardMessage( unsigned char* buf, int buflen, int srcSocket )
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{
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int success = 0;
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unsigned char* bufp = buf + 1; /* skip cmd */
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unsigned char* end = buf + buflen;
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CookieID cookieID;
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HostID src;
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HostID dest;
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if ( getNetShort( &bufp, end, &cookieID )
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&& getNetByte( &bufp, end, &src )
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&& getNetByte( &bufp, end, &dest ) ) {
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logf( XW_LOGINFO, "cookieID = %d", cookieID );
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SafeCref scr( cookieID );
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success = scr.Forward( src, dest, buf, buflen );
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}
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return success;
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} /* forwardMessage */
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static int
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processMessage( unsigned char* buf, int bufLen, int socket )
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{
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int success = 0; /* default is failure */
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XWRELAY_Cmd cmd = *buf;
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switch( cmd ) {
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case XWRELAY_GAME_CONNECT:
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logf( XW_LOGINFO, "processMessage got XWRELAY_CONNECT" );
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success = processConnect( buf+1, bufLen-1, socket );
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break;
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case XWRELAY_GAME_RECONNECT:
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logf( XW_LOGINFO, "processMessage got XWRELAY_RECONNECT" );
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success = processReconnect( buf+1, bufLen-1, socket );
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break;
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case XWRELAY_GAME_DISCONNECT:
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success = processDisconnect( buf+1, bufLen-1, socket );
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break;
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#ifdef RELAY_HEARTBEAT
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case XWRELAY_HEARTBEAT:
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logf( XW_LOGINFO, "processMessage got XWRELAY_HEARTBEAT" );
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success = processHeartbeat( buf + 1, bufLen - 1, socket );
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break;
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#endif
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case XWRELAY_MSG_TORELAY:
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logf( XW_LOGINFO, "processMessage got XWRELAY_MSG_TORELAY" );
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success = forwardMessage( buf, bufLen, socket );
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break;
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default:
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logf( XW_LOGINFO, "processMessage bad: %d", cmd );
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break;
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/* just drop it */
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}
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if ( !success ) {
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killSocket( socket, "couldn't forward message" );
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}
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return success; /* caller defines non-0 as failure */
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} /* processMessage */
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int
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make_socket( unsigned long addr, unsigned short port )
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{
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int sock = socket( AF_INET, SOCK_STREAM, 0 );
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assert( sock );
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/* We may be relaunching after crashing with sockets open. SO_REUSEADDR
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allows them to be immediately rebound. */
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int t = true;
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if ( 0 != setsockopt( sock, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(t) ) ) {
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logf( XW_LOGERROR, "setsockopt failed. errno = %s (%d)\n",
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strerror(errno), errno );
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return -1;
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}
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struct sockaddr_in sockAddr;
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sockAddr.sin_family = AF_INET;
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sockAddr.sin_addr.s_addr = htonl(addr);
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sockAddr.sin_port = htons(port);
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int result = bind( sock, (struct sockaddr*)&sockAddr, sizeof(sockAddr) );
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if ( result != 0 ) {
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logf( XW_LOGERROR, "exiting: unable to bind port %d: %d, "
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"errno = %s (%d)\n", port, result, strerror(errno), errno );
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return -1;
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}
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logf( XW_LOGINFO, "bound socket %d on port %d", sock, port );
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result = listen( sock, 5 );
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if ( result != 0 ) {
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logf( XW_LOGERROR, "exiting: unable to listen: %d, "
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"errno = %s (%d)\n", result, strerror(errno), errno );
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return -1;
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}
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return sock;
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} /* make_socket */
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static void
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usage( char* arg0 )
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{
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fprintf( stderr, "usage: %s \\\n", arg0 );
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fprintf( stderr,
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"\t-? (print this help)\\\n"
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"\t-c <cport> (localhost port for control console)\\\n"
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"\t-D (don't become daemon)\\\n"
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"\t-F (don't fork and wait to respawn child)\\\n"
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"\t-f <conffile> (config file)\\\n"
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"\t-h (print this help)\\\n"
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"\t-i <idfile> (file where next global id stored)\\\n"
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"\t-n <serverName> (used in permID generation)\\\n"
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"\t-p <port> (port to listen on)\\\n"
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"\t-t <nWorkerThreads> (how many worker threads to use)\\\n"
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);
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fprintf( stderr, "svn rev. %s\n", SVN_REV );
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}
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/* sockets that need to be closable from interrupt handler */
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ListenerMgr g_listeners;
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int g_control;
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void
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shutdown()
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{
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XWThreadPool* tPool = XWThreadPool::GetTPool();
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if ( tPool != NULL ) {
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tPool->Stop();
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}
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CRefMgr* cmgr = CRefMgr::Get();
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if ( cmgr != NULL ) {
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cmgr->CloseAll();
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delete cmgr;
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}
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delete tPool;
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stop_ctrl_threads();
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g_listeners.RemoveAll();
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close( g_control );
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exit( 0 );
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logf( XW_LOGINFO, "exit done" );
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}
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static void
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SIGINT_handler( int sig )
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{
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logf( XW_LOGERROR, "%s", __func__ );
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shutdown();
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}
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#ifdef SPAWN_SELF
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static void
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printWhy( int status )
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{
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if ( WIFEXITED(status) ) {
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logf( XW_LOGINFO, "why: exited" );
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} else if ( WIFSIGNALED(status) ) {
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logf( XW_LOGINFO, "why: signaled" );
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} else if ( WCOREDUMP(status) ) {
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logf( XW_LOGINFO, "why: core" );
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} else if ( WIFSTOPPED(status) ) {
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logf( XW_LOGINFO, "why: traced" );
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}
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} /* printWhy */
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#endif
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static void
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parentDied( int sig )
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{
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logf( XW_LOGINFO, "%s", __func__ );
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exit(0);
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}
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int main( int argc, char** argv )
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{
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int port = 0;
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int ctrlport = 0;
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int nWorkerThreads = 0;
|
|
char* conffile = NULL;
|
|
const char* serverName = NULL;
|
|
const char* idFileName = NULL;
|
|
bool doDaemon = true;
|
|
bool doFork = true;
|
|
|
|
/* Verify sizes here... */
|
|
assert( sizeof(CookieID) == 2 );
|
|
|
|
|
|
/* Read options. Options trump config file values when they conflict, but
|
|
the name of the config file is an option so we have to get that
|
|
first. */
|
|
|
|
for ( ; ; ) {
|
|
int opt = getopt(argc, argv, "h?c:p:n:i:f:t:DF" );
|
|
|
|
if ( opt == -1 ) {
|
|
break;
|
|
}
|
|
switch( opt ) {
|
|
case '?':
|
|
case 'h':
|
|
usage( argv[0] );
|
|
exit( 0 );
|
|
case 'c':
|
|
ctrlport = atoi( optarg );
|
|
break;
|
|
case 'D':
|
|
doDaemon = false;
|
|
break;
|
|
case 'F':
|
|
doFork = false;
|
|
break;
|
|
case 'f':
|
|
conffile = optarg;
|
|
break;
|
|
case 'i':
|
|
idFileName = optarg;
|
|
break;
|
|
case 'n':
|
|
serverName = optarg;
|
|
break;
|
|
case 'p':
|
|
port = atoi( optarg );
|
|
break;
|
|
case 't':
|
|
nWorkerThreads = atoi( optarg );
|
|
break;
|
|
default:
|
|
usage( argv[0] );
|
|
exit( 1 );
|
|
}
|
|
}
|
|
|
|
/* Did we consume all the options passed in? */
|
|
if ( optind != argc ) {
|
|
usage( argv[0] );
|
|
exit( 1 );
|
|
}
|
|
|
|
RelayConfigs::InitConfigs( conffile );
|
|
RelayConfigs* cfg = RelayConfigs::GetConfigs();
|
|
|
|
if ( ctrlport == 0 ) {
|
|
ctrlport = cfg->GetCtrlPort();
|
|
}
|
|
if ( nWorkerThreads == 0 ) {
|
|
nWorkerThreads = cfg->GetNWorkerThreads();
|
|
}
|
|
if ( serverName == NULL ) {
|
|
serverName = cfg->GetServerName();
|
|
}
|
|
if ( idFileName == NULL ) {
|
|
idFileName = cfg->GetIdFileName();
|
|
}
|
|
|
|
PermID::SetServerName( serverName );
|
|
PermID::SetIDFileName( idFileName );
|
|
|
|
/* add signal handling here */
|
|
|
|
/*
|
|
The daemon() function is for programs wishing to detach themselves from
|
|
the controlling terminal and run in the background as system daemons.
|
|
|
|
Unless the argument nochdir is non-zero, daemon() changes the current
|
|
working directory to the root ("/").
|
|
|
|
Unless the argument noclose is non-zero, daemon() will redirect standard
|
|
input, standard output and standard error to /dev/null.
|
|
|
|
(This function forks, and if the fork() succeeds, the parent does
|
|
_exit(0), so that further errors are seen by the child only.) On
|
|
success zero will be returned. If an error occurs, daemon() returns -1
|
|
and sets the global variable errno to any of the errors specified for
|
|
the library functions fork(2) and setsid(2).
|
|
*/
|
|
if ( doDaemon ) {
|
|
if ( 0 != daemon( true, false ) ) {
|
|
logf( XW_LOGERROR, "dev() => %s", strerror(errno) );
|
|
exit( -1 );
|
|
}
|
|
}
|
|
|
|
#ifdef SPAWN_SELF
|
|
/* loop forever, relaunching children as they die. */
|
|
while ( doFork ) {
|
|
pid_t pid = fork();
|
|
if ( pid == 0 ) { /* child */
|
|
break;
|
|
} else if ( pid > 0 ) {
|
|
int status;
|
|
logf( XW_LOGINFO, "parent waiting on child pid=%d", pid );
|
|
waitpid( pid, &status, 0 );
|
|
printWhy( status );
|
|
} else {
|
|
logf( XW_LOGERROR, "fork() => %s", strerror(errno) );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
prctl( PR_SET_PDEATHSIG, SIGUSR1 );
|
|
(void)signal( SIGUSR1, parentDied );
|
|
|
|
if ( port != 0 ) {
|
|
g_listeners.AddListener( port );
|
|
}
|
|
vector<int>::const_iterator iter, end;
|
|
cfg->GetPorts( &iter, &end );
|
|
while ( iter != end ) {
|
|
int port = *iter;
|
|
if ( !g_listeners.PortInUse( port ) ) {
|
|
g_listeners.AddListener( port );
|
|
} else {
|
|
logf( XW_LOGERROR, "port %d was in use", port );
|
|
}
|
|
++iter;
|
|
}
|
|
|
|
g_control = make_socket( INADDR_LOOPBACK, ctrlport );
|
|
if ( g_control == -1 ) {
|
|
exit( 1 );
|
|
}
|
|
|
|
struct sigaction act;
|
|
memset( &act, 0, sizeof(act) );
|
|
act.sa_handler = SIGINT_handler;
|
|
int err = sigaction( SIGINT, &act, NULL );
|
|
logf( XW_LOGERROR, "sigaction=>%d", err );
|
|
|
|
XWThreadPool* tPool = XWThreadPool::GetTPool();
|
|
tPool->Setup( nWorkerThreads, processMessage );
|
|
|
|
/* set up select call */
|
|
fd_set rfds;
|
|
for ( ; ; ) {
|
|
FD_ZERO(&rfds);
|
|
g_listeners.AddToFDSet( &rfds );
|
|
FD_SET( g_control, &rfds );
|
|
int highest = g_listeners.GetHighest();
|
|
if ( g_control > highest ) {
|
|
highest = g_control;
|
|
}
|
|
++highest;
|
|
|
|
int retval = select( highest, &rfds, NULL, NULL, NULL );
|
|
if ( retval < 0 ) {
|
|
if ( errno != 4 ) { /* 4's what we get when signal interrupts */
|
|
logf( XW_LOGINFO, "errno: %s (%d)", strerror(errno), errno );
|
|
}
|
|
} else {
|
|
logf( XW_LOGINFO, "creating ListenersIter" );
|
|
ListenersIter iter(&g_listeners, true);
|
|
while ( retval > 0 ) {
|
|
int listener = iter.next();
|
|
if ( listener < 0 ) {
|
|
break;
|
|
}
|
|
|
|
if ( FD_ISSET( listener, &rfds ) ) {
|
|
struct sockaddr_in newaddr;
|
|
socklen_t siz = sizeof(newaddr);
|
|
int newSock = accept( listener, (sockaddr*)&newaddr, &siz );
|
|
|
|
logf( XW_LOGINFO, "accepting connection from %s",
|
|
inet_ntoa(newaddr.sin_addr) );
|
|
|
|
tPool->AddSocket( newSock );
|
|
--retval;
|
|
}
|
|
}
|
|
if ( FD_ISSET( g_control, &rfds ) ) {
|
|
run_ctrl_thread( g_control );
|
|
--retval;
|
|
}
|
|
assert( retval == 0 );
|
|
}
|
|
}
|
|
|
|
g_listeners.RemoveAll();
|
|
close( g_control );
|
|
|
|
delete cfg;
|
|
|
|
return 0;
|
|
} // main
|