mirror of
git://xwords.git.sourceforge.net/gitroot/xwords/xwords
synced 2025-01-04 23:02:02 +01:00
a6784464ff
relay on behalf of a number of games. Works as long as all the games are open.
193 lines
6.2 KiB
C
193 lines
6.2 KiB
C
/* -*- compile-command: "make MEMDEBUG=TRUE -j3"; -*- */
|
|
/*
|
|
* Copyright 2013 by Eric House (xwords@eehouse.org). All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <netdb.h>
|
|
#include <errno.h>
|
|
|
|
#include "relaycon.h"
|
|
#include "comtypes.h"
|
|
|
|
typedef struct _RelayConStorage {
|
|
int socket;
|
|
RelayConnProcs procs;
|
|
void* procsClosure;
|
|
} RelayConStorage;
|
|
|
|
static RelayConStorage* getStorage( LaunchParams* params );
|
|
static void addressToServer( struct sockaddr_in* to, const CommsAddrRec* addr );
|
|
static XP_U32 addrForHost( const CommsAddrRec* addr );
|
|
static XP_U32 hostNameToIP( const XP_UCHAR* name );
|
|
static void relaycon_receive( void* closure, int socket );
|
|
|
|
void
|
|
relaycon_init( LaunchParams* params, const RelayConnProcs* procs,
|
|
void* procsClosure, const char* host, int port,
|
|
const XP_UCHAR* devID, DevIDType typ )
|
|
{
|
|
XP_ASSERT( !params->relayConStorage );
|
|
RelayConStorage* storage = getStorage( params );
|
|
XP_MEMCPY( &storage->procs, procs, sizeof(storage->procs) );
|
|
storage->procsClosure = procsClosure;
|
|
|
|
storage->socket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
|
|
(*params->socketChanged)( params, storage->socket, -1,
|
|
relaycon_receive, params );
|
|
|
|
XP_ASSERT( !!devID );
|
|
XP_U16 idLen = XP_STRLEN( devID );
|
|
XP_U16 lenNBO = XP_HTONS( idLen );
|
|
XP_U8 tmpbuf[1 + 1 + 1 + sizeof(lenNBO) + idLen];
|
|
tmpbuf[0] = XWREG_PROTO_VERSION;
|
|
tmpbuf[1] = XWRREG_REG;
|
|
tmpbuf[2] = typ;
|
|
XP_MEMCPY( &tmpbuf[3], &lenNBO, sizeof(lenNBO) );
|
|
XP_MEMCPY( &tmpbuf[5], devID, idLen );
|
|
|
|
struct sockaddr_in to = {0};
|
|
to.sin_family = PF_INET;
|
|
to.sin_addr.s_addr = htonl( hostNameToIP(host) );
|
|
to.sin_port = htons(port);
|
|
|
|
(void)sendto( storage->socket, tmpbuf, sizeof(tmpbuf), 0, /* flags */
|
|
(struct sockaddr*)&to, sizeof(to) );
|
|
}
|
|
|
|
XP_S16
|
|
relaycon_send( LaunchParams* params, const XP_U8* buf, XP_U16 buflen,
|
|
XP_U32 gameToken, const CommsAddrRec* addrRec )
|
|
{
|
|
ssize_t nSent = -1;
|
|
RelayConStorage* storage = getStorage( params );
|
|
|
|
struct sockaddr_in to = {0};
|
|
addressToServer( &to, addrRec );
|
|
|
|
XP_U8 tmpbuf[1 + 1 + sizeof(gameToken) + buflen];
|
|
tmpbuf[0] = XWREG_PROTO_VERSION;
|
|
tmpbuf[1] = XWRREG_MSG;
|
|
XP_U32 inNBO = htonl(gameToken);
|
|
XP_MEMCPY( &tmpbuf[2], &inNBO, sizeof(inNBO) );
|
|
XP_MEMCPY( &tmpbuf[1 + 1 + sizeof(gameToken)], buf, buflen );
|
|
nSent = sendto( storage->socket, tmpbuf, sizeof(tmpbuf), 0, /* flags */
|
|
(struct sockaddr*)&to, sizeof(to) );
|
|
if ( 1 + 1 + sizeof(gameToken) < nSent ) {
|
|
nSent -= 1 + 1 + sizeof(gameToken);
|
|
}
|
|
LOG_RETURNF( "%d", nSent );
|
|
return nSent;
|
|
}
|
|
|
|
static void
|
|
relaycon_receive( void* closure, int socket )
|
|
{
|
|
LaunchParams* params = (LaunchParams*)closure;
|
|
XP_ASSERT( !!params->relayConStorage );
|
|
RelayConStorage* storage = getStorage( params );
|
|
XP_U8 buf[512];
|
|
struct sockaddr_in from;
|
|
socklen_t fromlen = sizeof(from);
|
|
|
|
XP_LOGF( "%s: calling recvfrom on socket %d", __func__, socket );
|
|
|
|
ssize_t nRead = recvfrom( socket, buf, sizeof(buf), 0, /* flags */
|
|
(struct sockaddr*)&from, &fromlen );
|
|
XP_LOGF( "%s: read %d bytes", __func__, nRead );
|
|
if ( 0 <= nRead ) {
|
|
XP_U8* ptr = buf;
|
|
const XP_U8* end = buf + nRead;
|
|
XP_ASSERT( XWREG_PROTO_VERSION == *ptr++ );
|
|
XWRelayReg cmd = *ptr++;
|
|
switch( cmd ) {
|
|
case XWRREG_REGRSP: {
|
|
XP_U16 len;
|
|
XP_MEMCPY( &len, ptr, sizeof(len) );
|
|
len = ntohs( len );
|
|
ptr += sizeof( len );
|
|
XP_UCHAR devID[len+1];
|
|
XP_MEMCPY( devID, ptr, len );
|
|
devID[len] = '\0';
|
|
(*storage->procs.devIDChanged)( storage->procsClosure, devID );
|
|
}
|
|
break;
|
|
case XWRREG_MSG:
|
|
(*storage->procs.msgReceived)( storage->procsClosure,
|
|
ptr, end - ptr );
|
|
break;
|
|
default:
|
|
XP_LOGF( "%s: Unexpected cmd %d", __func__, cmd );
|
|
XP_ASSERT( 0 );
|
|
}
|
|
} else {
|
|
XP_LOGF( "%s: error reading udp socket: %d (%s)", __func__,
|
|
errno, strerror(errno) );
|
|
}
|
|
}
|
|
|
|
void
|
|
relaycon_cleanup( LaunchParams* params )
|
|
{
|
|
XP_FREEP( params->mpool, ¶ms->relayConStorage );
|
|
}
|
|
|
|
static RelayConStorage*
|
|
getStorage( LaunchParams* params )
|
|
{
|
|
RelayConStorage* storage = (RelayConStorage*)params->relayConStorage;
|
|
if ( NULL == storage ) {
|
|
storage = XP_CALLOC( params->mpool, sizeof(*storage) );
|
|
storage->socket = -1;
|
|
params->relayConStorage = storage;
|
|
}
|
|
return storage;
|
|
}
|
|
|
|
static void
|
|
addressToServer( struct sockaddr_in* to, const CommsAddrRec* addr )
|
|
{
|
|
to->sin_family = PF_INET;
|
|
to->sin_addr.s_addr = htonl( addrForHost(addr) );
|
|
to->sin_port = htons(addr->u.ip_relay.port);
|
|
}
|
|
|
|
static XP_U32
|
|
addrForHost( const CommsAddrRec* addr )
|
|
{
|
|
XP_U32 ip = addr->u.ip_relay.ipAddr;
|
|
if ( 0L == ip ) {
|
|
ip = hostNameToIP( addr->u.ip_relay.hostName );
|
|
}
|
|
return ip;
|
|
} /* addrForHost */
|
|
|
|
static XP_U32
|
|
hostNameToIP( const XP_UCHAR* name )
|
|
{
|
|
XP_U32 ip;
|
|
struct hostent* host;
|
|
XP_LOGF( "%s: looking up %s", __func__, name );
|
|
host = gethostbyname( name );
|
|
if ( NULL == host ) {
|
|
XP_WARNF( "gethostbyname returned NULL\n" );
|
|
} else {
|
|
XP_MEMCPY( &ip, host->h_addr_list[0], sizeof(ip) );
|
|
ip = ntohl(ip);
|
|
}
|
|
XP_LOGF( "%s found %lx for %s", __func__, ip, name );
|
|
return ip;
|
|
}
|