/*      $OpenBSD: loop.c,v 1.8 2009/10/27 23:59:52 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/common.h"
#include "common/mopdef.h"

/*
 * The list of all interfaces that are being listened to.  loop()
 * "selects" on the descriptors in this list.
 */
struct if_info *iflist;
u_char  buf[BUFSIZE];

void   mopProcess   (/* struct if_info *, u_char * */);

int
mopOpenRC(p, trans)
        struct if_info *p;
        int     trans;
{
#ifndef NORC
        int     fd;

        fd = (*(p->iopen))(p->if_name,
                           O_RDWR,
                           MOP_K_PROTO_RC,
                           trans);
        if (fd >= 0) {
                pfAddMulti(fd, p->if_name, rc_mcst);
                pfEthAddr(fd, p->eaddr);
        }

        return fd;
#else
        return -1;
#endif
}

int
mopOpenDL(p, trans)
        struct if_info *p;
        int     trans;
{
#ifndef NODL
        int     fd;

        fd = (*(p->iopen))(p->if_name,
                           O_RDWR,
                           MOP_K_PROTO_DL,
                           trans);
        if (fd >= 0) {
                pfAddMulti(fd, p->if_name, dl_mcst);
                pfEthAddr(fd, p->eaddr);
        }

        return fd;
#else
        return -1;
#endif
}

void
mopReadRC(p, fd)
        struct if_info *p;
        int     fd;
{
        int cc;

        if ((cc = pfRead(fd, buf+HDRSIZ, BUFSIZE-HDRSIZ)) < 0) {
                return;
        }

        if (cc == 0)
                return;

        mopProcess(p, buf+HDRSIZ);

        return;
}

void
mopReadDL(p, fd)
        struct if_info *p;
        int     fd;
{
        int cc;

        if ((cc = pfRead(fd, buf+HDRSIZ, BUFSIZE-HDRSIZ)) < 0) {
                return;
        }

        if (cc == 0)
                return;

        mopProcess(p, buf+HDRSIZ);

        return;
}

/*
 * Loop indefinitely listening for MOP requests on the
 * interfaces in 'iflist'.
 */
void
Loop()
{
        fd_set  fds, listeners;
        int     maxfd = 0;
        struct if_info *ii;

        if (iflist == 0) {
                fprintf(stderr,"no interfaces");
                exit(0);
        }
        
        /*
         * Find the highest numbered file descriptor for select().
         * Initialize the set of descriptors to listen to.
         */
        FD_ZERO(&fds);
        for (ii = iflist; ii; ii = ii->next) {
                if (ii->fd != -1) {
                        FD_SET(ii->fd, &fds);
                        if (ii->fd > maxfd)
                                maxfd = ii->fd;
                }
        }
        while (1) {
                listeners = fds;
                if (select(maxfd + 1, &listeners, (fd_set *) 0,
                        (fd_set *) 0, (struct timeval *) 0) < 0) {
                        fprintf(stderr, "select: %s", strerror(errno));
                        exit(0);
                }
                for (ii = iflist; ii; ii = ii->next) {
                        if (ii->fd != -1) {
                                if (FD_ISSET(ii->fd, &listeners))
                                        (*(ii->read))(ii,ii->fd);
                        }
                }
        }
}