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Annotation of embedaddon/igmpproxy/src/mcgroup.c, revision 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: }