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      1 /*	$NetBSD: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993-95 Mats O Jansson.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "port.h"
     28 #ifndef lint
     29 __RCSID("$NetBSD: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg Exp $");
     30 #endif
     31 
     32 #include <stdlib.h>
     33 #include <strings.h>
     34 #include <unistd.h>
     35 #include <errno.h>
     36 #if defined(__bsdi__) || defined(__FreeBSD__)
     37 #include <sys/time.h>
     38 #endif
     39 #include <sys/ioctl.h>
     40 
     41 #include "os.h"
     42 #include "common.h"
     43 #include "mopdef.h"
     44 
     45 int
     46 mopOpenRC(struct if_info *p, int trans)
     47 {
     48 #ifndef NORC
     49 	return (*(p->iopen))(p->if_name,
     50 			     O_RDWR,
     51 			     MOP_K_PROTO_RC,
     52 			     trans);
     53 #else
     54 	return -1;
     55 #endif
     56 }
     57 
     58 int
     59 mopOpenDL(struct if_info *p, int trans)
     60 {
     61 #ifndef NODL
     62 	return (*(p->iopen))(p->if_name,
     63 			     O_RDWR,
     64 			     MOP_K_PROTO_DL,
     65 			     trans);
     66 #else
     67 	return -1;
     68 #endif
     69 }
     70 
     71 void
     72 mopReadRC(void)
     73 {
     74 }
     75 
     76 void
     77 mopReadDL(void)
     78 {
     79 }
     80 
     81 /*
     82  * The list of all interfaces that are being listened to.  loop()
     83  * "selects" on the descriptors in this list.
     84  */
     85 extern struct if_info *iflist;
     86 
     87 void   mopProcess(struct if_info *, u_char *);
     88 
     89 /*
     90  * Loop indefinitely listening for MOP requests on the
     91  * interfaces in 'iflist'.
     92  */
     93 void
     94 Loop(void)
     95 {
     96 	u_char *buf, *bp, *ep;
     97 	int     cc;
     98 	fd_set  fds, listeners;
     99 	int     bufsize = 1100, maxfd =0;
    100 	struct if_info *ii;
    101 
    102 
    103 	if (iflist == 0) {
    104 		syslog(LOG_ERR, "no interfaces");
    105 		exit(0);
    106 	}
    107 
    108 	 buf = (u_char *) malloc((unsigned) bufsize);
    109 
    110 	if (buf == 0) {
    111 		syslog(LOG_ERR, "malloc: %m");
    112 		exit(0);
    113 	}
    114 	/*
    115          * Find the highest numbered file descriptor for select().
    116          * Initialize the set of descriptors to listen to.
    117          */
    118 	FD_ZERO(&fds);
    119 	for (ii = iflist; ii; ii = ii->next) {
    120 		if (ii->fd != -1) {
    121 			FD_SET(ii->fd, &fds);
    122 			if (ii->fd > maxfd)
    123 				maxfd = ii->fd;
    124 	        }
    125 	}
    126 	while (1) {
    127 		listeners = fds;
    128 		if (select(maxfd + 1, &listeners, (fd_set *) 0,
    129 			(fd_set *) 0, (struct timeval *) 0) < 0) {
    130 			syslog(LOG_ERR, "select: %m");
    131 			exit(0);
    132 		}
    133 		for (ii = iflist; ii; ii = ii->next) {
    134 			if (ii->fd != -1) {
    135 				if (!FD_ISSET(ii->fd, &listeners))
    136 					continue;
    137 			}
    138 	again:
    139 			cc = read(ii->fd, (char *) buf, bufsize);
    140 			/* Don't choke when we get ptraced */
    141 			if (cc < 0 && errno == EINTR)
    142 				goto again;
    143 
    144 			bp = buf;
    145 			ep = bp + cc;
    146 
    147 			if(bp < ep) {
    148 				mopProcess(ii,buf);
    149 			}
    150 
    151 		}
    152 	}
    153 }
    154