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Annotation of embedaddon/igmpproxy/src/mcgroup.c, revision 1.1.1.1

1.1       misho       1: /*
                      2: **  igmpproxy - IGMP proxy based multicast router 
                      3: **  Copyright (C) 2005 Johnny Egeland <johnny@rlo.org>
                      4: **
                      5: **  This program is free software; you can redistribute it and/or modify
                      6: **  it under the terms of the GNU General Public License as published by
                      7: **  the Free Software Foundation; either version 2 of the License, or
                      8: **  (at your option) any later version.
                      9: **
                     10: **  This program is distributed in the hope that it will be useful,
                     11: **  but WITHOUT ANY WARRANTY; without even the implied warranty of
                     12: **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     13: **  GNU General Public License for more details.
                     14: **
                     15: **  You should have received a copy of the GNU General Public License
                     16: **  along with this program; if not, write to the Free Software
                     17: **  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     18: **
                     19: **----------------------------------------------------------------------------
                     20: **
                     21: **  This software is derived work from the following software. The original
                     22: **  source code has been modified from it's original state by the author
                     23: **  of igmpproxy.
                     24: **
                     25: **  smcroute 0.92 - Copyright (C) 2001 Carsten Schill <carsten@cschill.de>
                     26: **  - Licensed under the GNU General Public License, version 2
                     27: **  
                     28: **  mrouted 3.9-beta3 - COPYRIGHT 1989 by The Board of Trustees of 
                     29: **  Leland Stanford Junior University.
                     30: **  - Original license can be found in the Stanford.txt file.
                     31: **
                     32: */
                     33: /**
                     34: *   mcgroup contains functions for joining and leaving multicast groups.
                     35: *
                     36: */
                     37: 
                     38: #include "igmpproxy.h"
                     39:        
                     40: 
                     41: /**
                     42: *   Common function for joining or leaving a MCast group.
                     43: */
                     44: static int joinleave( int Cmd, int UdpSock, struct IfDesc *IfDp, uint32_t mcastaddr ) {
                     45:     struct ip_mreq CtlReq;
                     46:     const char *CmdSt = Cmd == 'j' ? "join" : "leave";
                     47:     
                     48:     memset(&CtlReq, 0, sizeof(CtlReq));
                     49:     CtlReq.imr_multiaddr.s_addr = mcastaddr;
                     50:     CtlReq.imr_interface.s_addr = IfDp->InAdr.s_addr;
                     51:     
                     52:     {
                     53:         my_log( LOG_NOTICE, 0, "%sMcGroup: %s on %s", CmdSt, 
                     54:             inetFmt( mcastaddr, s1 ), IfDp ? IfDp->Name : "<any>" );
                     55:     }
                     56:     
                     57:     if( setsockopt( UdpSock, IPPROTO_IP, 
                     58:           Cmd == 'j' ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, 
                     59:           (void *)&CtlReq, sizeof( CtlReq ) ) ) 
                     60:     {
                     61:         my_log( LOG_WARNING, errno, "MRT_%s_MEMBERSHIP failed", Cmd == 'j' ? "ADD" : "DROP" );
                     62:         return 1;
                     63:     }
                     64:     
                     65:     return 0;
                     66: }
                     67: 
                     68: /**
                     69: *   Joins the MC group with the address 'McAdr' on the interface 'IfName'. 
                     70: *   The join is bound to the UDP socket 'UdpSock', so if this socket is 
                     71: *   closed the membership is dropped.
                     72: *          
                     73: *   @return 0 if the function succeeds, 1 if parameters are wrong or the join fails
                     74: */
                     75: int joinMcGroup( int UdpSock, struct IfDesc *IfDp, uint32_t mcastaddr ) {
                     76:     return joinleave( 'j', UdpSock, IfDp, mcastaddr );
                     77: }
                     78: 
                     79: /**
                     80: *   Leaves the MC group with the address 'McAdr' on the interface 'IfName'. 
                     81: *          
                     82: *   @return 0 if the function succeeds, 1 if parameters are wrong or the join fails
                     83: */
                     84: int leaveMcGroup( int UdpSock, struct IfDesc *IfDp, uint32_t mcastaddr ) {
                     85:     return joinleave( 'l', UdpSock, IfDp, mcastaddr );
                     86: }