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/*
** smcroute - static multicast routing control
** Copyright (C) 2001 Carsten Schill <carsten@cschill.de>
**
** 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
**
** $Id: ifvc.c,v 1.5 2002/07/07 19:39:28 cschill Exp $
**
** This module manages an interface vector of the machine
**
*/
#include <unistd.h>
#include <sys/ioctl.h>
#include "mclab.h"
#include <linux/sockios.h>
struct IfDesc IfDescVc[ MAX_IF ], *IfDescEp = IfDescVc;
void buildIfVc()
/*
** Builds up a vector with the interface of the machine. Calls to the other functions of
** the module will fail if they are called before the vector is build.
**
*/
{
struct ifreq IfVc[ sizeof( IfDescVc ) / sizeof( IfDescVc[ 0 ] ) ];
struct ifreq *IfEp;
int Sock;
if( (Sock = socket( AF_INET, SOCK_DGRAM, 0 )) < 0 )
smclog( LOG_ERR, errno, "RAW socket open" );
/* get If vector
*/
{
struct ifconf IoCtlReq;
IoCtlReq.ifc_buf = (void *)IfVc;
IoCtlReq.ifc_len = sizeof( IfVc );
if( ioctl( Sock, SIOCGIFCONF, &IoCtlReq ) < 0 )
smclog( LOG_ERR, errno, "ioctl SIOCGIFCONF" );
IfEp = (void *)((char *)IfVc + IoCtlReq.ifc_len);
}
/* loop over interfaces and copy interface info to IfDescVc
*/
{
struct ifreq *IfPt;
for( IfPt = IfVc; IfPt < IfEp; IfPt++ ) {
char FmtBu[ 32 ];
strncpy( IfDescEp->Name, IfPt->ifr_name, sizeof( IfDescEp->Name ) );
/* don't retrieve more info for non-IP interfaces
*/
if( IfPt->ifr_addr.sa_family != AF_INET ) {
IfDescEp->InAdr.s_addr = 0; /* mark as non-IP interface */
IfDescEp++;
continue;
}
IfDescEp->InAdr = ((struct sockaddr_in *)&IfPt->ifr_addr)->sin_addr;
/* get if flags
**
** typical flags:
** lo 0x0049 -> Running, Loopback, Up
** ethx 0x1043 -> Multicast, Running, Broadcast, Up
** ipppx 0x0091 -> NoArp, PointToPoint, Up
** grex 0x00C1 -> NoArp, Running, Up
** ipipx 0x00C1 -> NoArp, Running, Up
*/
{
struct ifreq IfReq;
memcpy( IfReq.ifr_name, IfDescEp->Name, sizeof( IfReq.ifr_name ) );
if( ioctl( Sock, SIOCGIFFLAGS, &IfReq ) < 0 )
smclog( LOG_ERR, errno, "ioctl SIOCGIFFLAGS" );
IfDescEp->Flags = IfReq.ifr_flags;
}
smclog( LOG_DEBUG, 0, "buildIfVc: Interface %s Addr: %s, Flags: 0x%04x",
IfDescEp->Name,
fmtInAdr( FmtBu, IfDescEp->InAdr ),
IfDescEp->Flags );
IfDescEp++;
}
}
close( Sock );
}
struct IfDesc *getIfByName( const char *IfName )
/*
** Returns a pointer to the IfDesc of the interface 'IfName'
**
** returns: - pointer to the IfDesc of the requested interface
** - NULL if no interface 'IfName' exists
**
*/
{
struct IfDesc *Dp;
for( Dp = IfDescVc; Dp < IfDescEp; Dp++ )
if( ! strcmp( IfName, Dp->Name ) )
return Dp;
return NULL;
}
struct IfDesc *getIfByIx( unsigned Ix )
/*
** Returns a pointer to the IfDesc of the interface 'Ix'
**
** returns: - pointer to the IfDesc of the requested interface
** - NULL if no interface 'Ix' exists
**
*/
{
struct IfDesc *Dp = &IfDescVc[ Ix ];
return Dp < IfDescEp ? Dp : NULL;
}
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