/*      $NetBSD: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg 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: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg Exp $");
#endif

#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <errno.h>
#if defined(__bsdi__) || defined(__FreeBSD__)
#include <sys/time.h>
#endif
#include <sys/ioctl.h>

#include "os.h"
#include "common.h"
#include "mopdef.h"

int
mopOpenRC(struct if_info *p, int trans)
{
#ifndef NORC
       return (*(p->iopen))(p->if_name,
                            O_RDWR,
                            MOP_K_PROTO_RC,
                            trans);
#else
       return -1;
#endif
}

int
mopOpenDL(struct if_info *p, int trans)
{
#ifndef NODL
       return (*(p->iopen))(p->if_name,
                            O_RDWR,
                            MOP_K_PROTO_DL,
                            trans);
#else
       return -1;
#endif
}

void
mopReadRC(void)
{
}

void
mopReadDL(void)
{
}

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

void   mopProcess(struct if_info *, u_char *);

/*
* Loop indefinitely listening for MOP requests on the
* interfaces in 'iflist'.
*/
void
Loop(void)
{
       u_char *buf, *bp, *ep;
       int     cc;
       fd_set  fds, listeners;
       int     bufsize = 1100, maxfd =0;
       struct if_info *ii;


       if (iflist == 0) {
               syslog(LOG_ERR, "no interfaces");
               exit(0);
       }

        buf = (u_char *) malloc((unsigned) bufsize);

       if (buf == 0) {
               syslog(LOG_ERR, "malloc: %m");
               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) {
                       syslog(LOG_ERR, "select: %m");
                       exit(0);
               }
               for (ii = iflist; ii; ii = ii->next) {
                       if (ii->fd != -1) {
                               if (!FD_ISSET(ii->fd, &listeners))
                                       continue;
                       }
       again:
                       cc = read(ii->fd, (char *) buf, bufsize);
                       /* Don't choke when we get ptraced */
                       if (cc < 0 && errno == EINTR)
                               goto again;

                       bp = buf;
                       ep = bp + cc;

                       if(bp < ep) {
                               mopProcess(ii,buf);
                       }

               }
       }
}