Return to vrrp_multicast.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / freevrrpd

freevrrpd 1.1

    1: /*
    2:  * Copyright (c) 2001,2002 Sebastien Petit <spe@bsdfr.org>
    3:  *
    4:  * Redistribution and use in source forms, with and without modification,
    5:  * are permitted provided that the following conditions are met:
    6:  * 1. Redistributions of source code must retain the above copyright notice,
    7:  *    this list of conditions and the following disclaimer.
    8:  * 2. Redistributions in binary form must reproduce the above copyright notice,
    9:  *    this list of conditions and the following disclaimer in the documentation
   10:  *    and/or other materials provided with the distribution. Obviously, it
   11:  *    would be nice if you gave credit where credit is due but requiring it
   12:  *    would be too onerous.
   13:  * 3. All advertising materials mentioning features or use of this software
   14:  *    must display the following acknowledgement:
   15:  *      This product includes software developed by Sebastien Petit.
   16:  * 4. Neither the name of its contributors may be used to endorse or promote
   17:  *    products derived from this software without specific prior written
   18:  *    permission.
   19:  *
   20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30:  * SUCH DAMAGE.
   31:  *
   32:  * $Id: vrrp_multicast.c,v 1.1.1.1 2017/06/14 12:01:54 misho Exp $
   33:  */
   34: 
   35: #include <errno.h>
   36: #include "vrrp_multicast.h"
   37: 
   38: /* join multicast group with ip address */
   39: char 
   40: vrrp_multicast_join_group(int sd, u_char * multicast_ip, struct in_addr * interface_ip)
   41: {
   42: 	struct ip_mreq  imr;
   43: 
   44: 	bzero(&imr, sizeof(imr));
   45: 	imr.imr_multiaddr.s_addr = inet_addr(multicast_ip);
   46: 	imr.imr_interface.s_addr = interface_ip->s_addr;
   47: 	if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr)) == -1) {
   48: 		syslog(LOG_ERR, "cannot join multicast group %s with ip source %s [ IP_ADD_MEMBERSHIP ]", multicast_ip, inet_ntoa(*interface_ip));
   49: 		return -1;
   50: 	}
   51: 	return 0;
   52: }
   53: 
   54: /* Set multicast ttl IP */
   55: char 
   56: vrrp_multicast_set_ttl(int sd, u_char ttl)
   57: {
   58: 	if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) == -1) {
   59: 		syslog(LOG_ERR, "cannot set multicast TTL: %s", strerror(errno));
   60: 		return -1;
   61: 	}
   62: 	return 0;
   63: }
   64: 
   65: char 
   66: vrrp_multicast_set_if(int sd, struct in_addr * addr, char *if_name)
   67: {
   68: 	if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF, addr, sizeof(*addr)) == -1) {
   69: 		syslog(LOG_ERR, "cannot setsockopt IP_MULTICAST_IF on primary address of %s: %s", if_name, strerror(errno));
   70: 		return -1;
   71: 	}
   72: 	return 0;
   73: }
   74: 
   75: int vrrp_multicast_set_loopback(int sd, u_char flag) {
   76: 	if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_LOOP, &flag, sizeof(flag)) == -1) {
   77: 		syslog(LOG_ERR, "cannot setsockopt IP_MULTICAST_LOOP: %s", strerror(errno));
   78: 		return -1;
   79: 	}
   80: 
   81: 	return 0;
   82: }
   83: 
   84: /* Open VRRP socket and join multicast group */
   85: char 
   86: vrrp_multicast_set_socket(struct vrrp_vr * vr)
   87: {
   88: 	if (vrrp_multicast_join_group(vr->sd, VRRP_MULTICAST_IP, (struct in_addr *) & vr->vr_if->ip_addrs[0]) == -1) {
   89: 		close(vr->sd);
   90: 		return -1;
   91: 	}
   92: 	if (vrrp_multicast_set_ttl(vr->sd, VRRP_MULTICAST_TTL) == -1) {
   93: 		close(vr->sd);
   94: 		return -1;
   95: 	}
   96: 	/* XXX don't need to force interface for multicast. Let the kernel
   97: 	 * choose by itself. this setsockopt doesn't work with ipsec/ah...
   98: 	 * don't know why */
   99: 	if (vrrp_multicast_set_if(vr->sd, &vr->vr_if->ip_addrs[0], vr->vr_if->if_name) == -1) {
  100: 		close(vr->sd);
  101: 		return -1;
  102: 	}
  103: 	if (vrrp_multicast_set_loopback(vr->sd, VRRP_MULTICAST_DISABLE_LOOPBACK) == -1) {
  104: 		close(vr->sd);
  105: 		return -1;
  106: 	}
  107: 
  108: 	return 0;
  109: }
  110: 
  111: char 
  112: vrrp_multicast_open_socket(struct vrrp_vr * vr)
  113: {
  114: 	if (vrrp_network_open_socket(vr) == -1)
  115: 		return -1;
  116: 	if (vrrp_multicast_set_socket(vr) == -1)
  117: 		return -1;
  118: 
  119: 	return 0;
  120: }