GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/mrouted/config.c Lines: 0 49 0.0 %
Date: 2017-11-13 Branches: 0 26 0.0 %

Line Branch Exec Source
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/*	$NetBSD: config.c,v 1.6 1995/12/10 10:06:58 mycroft Exp $	*/
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/*
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 * The mrouted program is covered by the license in the accompanying file
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 * named "LICENSE".  Use of the mrouted program represents acceptance of
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 * the terms and conditions listed in that file.
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 *
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 * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
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 * Leland Stanford Junior University.
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 */
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#include "defs.h"
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#include <net/if.h>
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#include <ifaddrs.h>
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/*
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 * Query the kernel to find network interfaces that are multicast-capable
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 * and install them in the uvifs array.
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 */
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void
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config_vifs_from_kernel(void)
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{
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    struct ifaddrs *ifa, *ifap;
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    struct uvif *v;
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    vifi_t vifi;
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    u_int32_t addr, mask, subnet;
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    short flags;
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    if (getifaddrs(&ifap) < 0)
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	logit(LOG_ERR, errno, "getifaddrs");
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    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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	/*
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	 * Ignore any interface for an address family other than IP.
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	 */
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	if (ifa->ifa_addr->sa_family != AF_INET)
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	    continue;
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	addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
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	/*
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	 * Ignore loopback interfaces and interfaces that do not support
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	 * multicast.
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	 */
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	flags = ifa->ifa_flags;
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	if ((flags & (IFF_LOOPBACK|IFF_MULTICAST)) != IFF_MULTICAST)
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	    continue;
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	/*
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	 * Ignore any interface whose address and mask do not define a
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	 * valid subnet number, or whose address is of the form {subnet,0}
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	 * or {subnet,-1}.
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	 */
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	mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr.s_addr;
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	subnet = addr & mask;
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	if (!inet_valid_subnet(subnet, mask) ||
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	    addr == subnet ||
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	    addr == (subnet | ~mask)) {
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	    logit(LOG_WARNING, 0,
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		"ignoring %s, has invalid address (%s) and/or mask (%s)",
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		ifa->ifa_name, inet_fmt(addr, s1), inet_fmt(mask, s2));
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	    continue;
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	}
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	/*
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	 * Ignore any interface that is connected to the same subnet as
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	 * one already installed in the uvifs array.
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	 */
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	for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
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	    if ((addr & v->uv_subnetmask) == v->uv_subnet ||
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		(v->uv_subnet & mask) == subnet) {
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		logit(LOG_WARNING, 0, "ignoring %s, same subnet as %s",
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		    ifa->ifa_name, v->uv_name);
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		break;
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	    }
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	}
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	if (vifi != numvifs)
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	    continue;
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	/*
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	 * If there is room in the uvifs array, install this interface.
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	 */
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	if (numvifs == MAXVIFS) {
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	    logit(LOG_WARNING, 0, "too many vifs, ignoring %s", ifa->ifa_name);
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	    continue;
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	}
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	v  = &uvifs[numvifs];
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	v->uv_flags       = 0;
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	v->uv_metric      = DEFAULT_METRIC;
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	v->uv_rate_limit  = DEFAULT_PHY_RATE_LIMIT;
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	v->uv_threshold   = DEFAULT_THRESHOLD;
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	v->uv_lcl_addr    = addr;
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	v->uv_rmt_addr    = 0;
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	v->uv_subnet      = subnet;
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	v->uv_subnetmask  = mask;
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	v->uv_subnetbcast = subnet | ~mask;
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	strlcpy(v->uv_name, ifa->ifa_name, sizeof(v->uv_name));
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	v->uv_groups      = NULL;
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	v->uv_neighbors   = NULL;
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	v->uv_acl         = NULL;
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	v->uv_addrs	  = NULL;
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	logit(LOG_INFO,0,"installing %s (%s on subnet %s) as vif #%u - rate=%d",
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	    v->uv_name, inet_fmt(addr, s1), inet_fmts(subnet, mask, s2),
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	    numvifs, v->uv_rate_limit);
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	++numvifs;
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	/*
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	 * If the interface is not yet up, set the vifs_down flag to
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	 * remind us to check again later.
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	 */
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	if (!(flags & IFF_UP)) {
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	    v->uv_flags |= VIFF_DOWN;
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	    vifs_down = TRUE;
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	}
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    }
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    freeifaddrs(ifap);
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}