xref: /src/usr.sbin/mopd/common/device.c

/*	$NetBSD: device.c,v 1.14 2024/12/03 05:40:39 kalvisd Exp $	*/

/*
 * Copyright (c) 1993-95 Mats O Jansson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "port.h"
#ifndef lint
__RCSID("$NetBSD: device.c,v 1.14 2024/12/03 05:40:39 kalvisd Exp $");
#endif

#include "os.h"
#include "common.h"
#include "device.h"
#include "mopdef.h"
#include "pf.h"
#include "log.h"

struct	if_info *iflist;		/* Interface List		*/

void	deviceOpen(const char *, u_short, int);

/*
 * Return ethernet address for interface
 */

void
deviceEthAddr(const char *ifname, u_char *eaddr)
{
#ifndef AF_LINK
	int fd;
	struct ifreq ifr;

	/* Use datagram socket to get Ethernet address. */
	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
		mopLogErr("deviceEthAddr: socket");

	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
	if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1)
		mopLogErr("deviceEthAddr: SIOGIFHWADDR");
	memcpy(eaddr, ifr.ifr_hwaddr.sa_data, 6);
	close(fd);
#else
	struct sockaddr_dl *sdl;
	struct ifaddrs *ifap, *ifa;

	if (getifaddrs(&ifap) != 0)
		mopLogErr("deviceEthAddr: getifaddrs");

	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
		if (sdl->sdl_family != AF_LINK || sdl->sdl_type != IFT_ETHER ||
		    sdl->sdl_alen != 6)
			continue;
		if (!strcmp(ifa->ifa_name, ifname)) {
			memmove((caddr_t)eaddr, (caddr_t)LLADDR(sdl), 6);
			freeifaddrs(ifap);
			return;
		}
	}

	freeifaddrs(ifap);
	mopLogErrX("deviceEthAddr: Never saw interface `%s'!", ifname);
#endif
}

void
deviceOpen(const char *ifname, u_short proto, int trans)
{
	struct if_info *p, tmp;

	strlcpy(tmp.if_name, ifname, sizeof(tmp.if_name));
	tmp.iopen   = pfInit;
	tmp.fd      = -1;

	switch (proto) {
	case MOP_K_PROTO_RC:
		tmp.read = mopReadRC;
		tmp.fd   = mopOpenRC(&tmp, trans);
		break;
	case MOP_K_PROTO_DL:
		tmp.read = mopReadDL;
		tmp.fd   = mopOpenDL(&tmp, trans);
		break;
	default:
		break;
	}

	if (tmp.fd != -1) {
		p = malloc(sizeof(*p));
		if (p == 0)
			mopLogErr("deviceOpen: malloc");

		p->next = iflist;
		iflist = p;

		strlcpy(p->if_name, tmp.if_name, sizeof(p->if_name));
		p->iopen   = tmp.iopen;
		p->write   = pfWrite;
		p->read    = tmp.read;
		memset((char *)p->eaddr, 0, sizeof(p->eaddr));
		p->fd      = tmp.fd;

#ifdef	DEV_NEW_CONF
		deviceEthAddr(p->if_name,&p->eaddr[0]);
#else
		p->eaddr[0]= tmp.eaddr[0];
		p->eaddr[1]= tmp.eaddr[1];
		p->eaddr[2]= tmp.eaddr[2];
		p->eaddr[3]= tmp.eaddr[3];
		p->eaddr[4]= tmp.eaddr[4];
		p->eaddr[5]= tmp.eaddr[5];
#endif	/* DEV_NEW_CONF */

	}
}

void
deviceInitOne(const char *ifname)
{
	char	interface[IFNAME_SIZE];
	struct if_info *p;
	int	trans;
#ifdef _AIX
	char	dev[IFNAME_SIZE];
	int	unit,j;

	unit = 0;
	for (j = 0; j < strlen(ifname); j++) {
		if (isalpha(ifname[j])) {
			dev[j] = ifname[j];
		} else {
			if (isdigit(ifname[j])) {
				unit = unit*10 + ifname[j] - '0';
				dev[j] = '\0';
			}
		}
	}

	if ((strlen(dev) == 2) &&
	    (dev[0] == 'e') &&
	    ((dev[1] == 'n') || (dev[1] == 't'))) {
		snprintf(interface, sizeof(interface), "ent%d\0", unit);
	} else {
		snprintf(interface, sizeof(interface), "%s%d\0", dev, unit);
	}
#else
	snprintf(interface, sizeof(interface), "%s", ifname);
#endif /* _AIX */

	/* Ok, init it just once */

	p = iflist;
	for (p = iflist; p; p = p->next)  {
		if (strcmp(p->if_name,interface) == 0) {
			return;
		}
	}

	if (!mopInteractive)
		syslog(LOG_INFO, "Initialized %s", interface);

	/* Ok, get transport information */

	trans = pfTrans(interface);

#ifndef NORC
	/* Start with MOP Remote Console */

	switch (trans) {
	case TRANS_ETHER:
		deviceOpen(interface,MOP_K_PROTO_RC,TRANS_ETHER);
		break;
	case TRANS_8023:
		deviceOpen(interface,MOP_K_PROTO_RC,TRANS_8023);
		break;
	case TRANS_ETHER+TRANS_8023:
		deviceOpen(interface,MOP_K_PROTO_RC,TRANS_ETHER);
		deviceOpen(interface,MOP_K_PROTO_RC,TRANS_8023);
		break;
	case TRANS_ETHER+TRANS_8023+TRANS_AND:
		deviceOpen(interface,MOP_K_PROTO_RC,TRANS_ETHER+TRANS_8023);
		break;
	}
#endif

#ifndef NODL
	/* and next MOP Dump/Load */

	switch (trans) {
	case TRANS_ETHER:
		deviceOpen(interface,MOP_K_PROTO_DL,TRANS_ETHER);
		break;
	case TRANS_8023:
		deviceOpen(interface,MOP_K_PROTO_DL,TRANS_8023);
		break;
	case TRANS_ETHER+TRANS_8023:
		deviceOpen(interface,MOP_K_PROTO_DL,TRANS_ETHER);
		deviceOpen(interface,MOP_K_PROTO_DL,TRANS_8023);
		break;
	case TRANS_ETHER+TRANS_8023+TRANS_AND:
		deviceOpen(interface,MOP_K_PROTO_DL,TRANS_ETHER+TRANS_8023);
		break;
	}
#endif

}

/*
 * Initialize all "candidate" interfaces that are in the system
 * configuration list.  A "candidate" is up, not loopback and not
 * point to point.
 */
void
deviceInitAll(void)
{
	struct ifaddrs *ifap, *ifa;

	if (getifaddrs(&ifap) != 0)
		mopLogErr("deviceInitAll: socket");

	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
#ifdef	AF_LINK
		struct sockaddr_dl *sdl;
		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
		if (sdl->sdl_family != AF_LINK || sdl->sdl_type != IFT_ETHER ||
		    sdl->sdl_alen != 6)
			continue;
#endif
		if ((ifa->ifa_flags &
		    (IFF_UP | IFF_LOOPBACK | IFF_POINTOPOINT)) != IFF_UP)
			continue;
		deviceInitOne(ifa->ifa_name);
	}

	freeifaddrs(ifap);
}