/*      $OpenBSD: device.c,v 1.18 2021/01/26 18:25:07 deraadt 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 "os.h"
#include "common.h"
#include "device.h"
#include "mopdef.h"
#include "pf.h"

extern struct if_info   *iflist;                /* Interface List               */

#ifdef  DEV_NEW_CONF
/*
 * Return ethernet address for interface
 */

void
deviceEthAddr(char *ifname, u_char *eaddr)
{
        struct sockaddr_dl      *sdl;
        struct ifaddrs          *ifap, *ifa;

        if (getifaddrs(&ifap) != 0) {
                syslog(LOG_ERR, "deviceEthAddr: getifaddrs: %m");
                exit(1);
        }

        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)) {
                        bcopy(LLADDR(sdl), eaddr, 6);
                        freeifaddrs(ifap);
                        return;
                }
        }

        syslog(LOG_ERR, "deviceEthAddr: Never saw interface `%s'!", ifname);
        exit(1);
}
#endif  /* DEV_NEW_CONF */

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

        strncpy(tmp.if_name, ifname, sizeof(tmp.if_name) - 1);
        tmp.if_name[sizeof(tmp.if_name) - 1] = 0;
        tmp.iopen = pfInit;

        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) {
                        syslog(LOG_ERR, "deviceOpen: malloc: %m");
                        exit(1);
                }

                p->next = iflist;
                iflist = p;

                strlcpy(p->if_name, tmp.if_name, IFNAME_SIZE);
                p->iopen   = tmp.iopen;
                p->write   = pfWrite;
                p->read    = tmp.read;
                bzero(p->eaddr, 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 */

#ifdef LINUX2_PF
                {
                        int s;

                        s = socket(AF_INET, SOCK_DGRAM, 0);
                        pfEthAddr(s, p->if_name, &p->eaddr[0]);
                        close(s);
                }
#endif
        }
}

void
deviceInitOne(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((unsigned char)ifname[j]))
                        dev[j] = ifname[j];
                else
                        if (isdigit((unsigned char)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;

        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()
{
#ifdef DEV_NEW_CONF
        struct sockaddr_dl      *sdl;
        struct ifaddrs          *ifap, *ifa;

        if (getifaddrs(&ifap) != 0) {
                syslog(LOG_ERR, "deviceInitAll: getifaddrs: %m");
                exit(1);
        }

        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 ((ifa->ifa_flags &
                    (IFF_UP | IFF_LOOPBACK | IFF_POINTOPOINT)) != IFF_UP)
                        continue;
                deviceInitOne(ifa->ifa_name);
        }
        freeifaddrs(ifap);
#else
        struct ifaddrs  *ifap, *ifa;

        if (getifaddrs(&ifap) != 0) {
                syslog(LOG_ERR, "deviceInitAll: getifaddrs: %m");
                exit(1);
        }

        for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
                if (/*(ifa->ifa_flags & IFF_UP) == 0 ||*/
                    ifa->ifa_flags & IFF_LOOPBACK ||
                    ifa->ifa_flags & IFF_POINTOPOINT)
                        continue;
                deviceInitOne(ifa->ifa_name);
        }
        freeifaddrs(ifap);
#endif
}