GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/amd/amd/wire.c Lines: 0 30 0.0 %
Date: 2017-11-13 Branches: 0 22 0.0 %

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/*
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 * Copyright (c) 1990 Jan-Simon Pendry
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 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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 * Copyright (c) 1990, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Jan-Simon Pendry at Imperial College, London.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *	from: @(#)wire.c	8.1 (Berkeley) 6/6/93
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 *	$Id: wire.c,v 1.13 2014/10/24 10:29:56 schwarze Exp $
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 */
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/*
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 * This function returns the subnet (address&netmask) for the primary network
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 * interface.  If the resulting address has an entry in the hosts file, the
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 * corresponding name is retuned, otherwise the address is returned in
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 * standard internet format.
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 * As a side-effect, a list of local IP/net address is recorded for use
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 * by the islocalnet() function.
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 *
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 * Derived from original by Paul Anderson (23/4/90)
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 * Updates from Dirk Grunwald (11/11/91)
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 * Modified to use getifaddrs() by Todd C. Miller (6/14/2003)
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 */
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#include "am.h"
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <net/if.h>
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#define NO_SUBNET "notknown"
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/*
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 * List of locally connected networks
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 */
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typedef struct addrlist addrlist;
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struct addrlist {
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	addrlist *ip_next;
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	in_addr_t ip_addr;
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	in_addr_t ip_mask;
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};
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static addrlist *localnets = 0;
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char *
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getwire(void)
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{
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	struct ifaddrs *ifa, *ifaddrs;
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	struct hostent *hp;
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	addrlist *al;
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	char *s, *netname = NULL;
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	if (getifaddrs(&ifaddrs))
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		return strdup(NO_SUBNET);
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	for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
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		/*
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		 * Ignore non-AF_INET interfaces as well as any that
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		 * are down or loopback.
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		 */
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		if (ifa->ifa_addr == NULL ||
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		    ifa->ifa_addr->sa_family != AF_INET ||
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		    !(ifa->ifa_flags & IFF_UP) ||
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		    (ifa->ifa_flags & IFF_LOOPBACK))
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			continue;
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		/*
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		 * Add interface to local network list
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		 */
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		al = ALLOC(addrlist);
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		al->ip_addr =
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		    ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
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		al->ip_mask =
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		    ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr.s_addr;
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		al->ip_next = localnets;
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		localnets = al;
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		/*
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		 * Look up the host name; fall back to a dotted quad.
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		 */
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		if (netname == NULL) {
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			in_addr_t subnet;
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			char dq[20];
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			subnet = al->ip_addr & al->ip_mask;
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			hp = gethostbyaddr((char *) &subnet, 4, AF_INET);
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			if (hp)
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				s = hp->h_name;
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			else
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				s = inet_dquad(dq, sizeof(dq), subnet);
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			netname = strdup(s);
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		}
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	}
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	freeifaddrs(ifaddrs);
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	return (netname ? netname : strdup(NO_SUBNET));
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}
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/*
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 * Determine whether a network is on a local network
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 * (addr) is in network byte order.
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 */
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int
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islocalnet(in_addr_t addr)
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{
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	addrlist *al;
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	for (al = localnets; al; al = al->ip_next)
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		if (((addr ^ al->ip_addr) & al->ip_mask) == 0)
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			return TRUE;
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#ifdef DEBUG
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	{ char buf[16];
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	plog(XLOG_INFO, "%s is on a remote network", inet_dquad(buf, sizeof(buf), addr));
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	}
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#endif
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	return FALSE;
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}