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/* $OpenBSD: loop-bsd.c,v 1.13 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__bsdi__) || defined(__FreeBSD__)
#include <sys/time.h>
#endif
#include <net/bpf.h>
#include <sys/ioctl.h>
#include "os.h"
#include "common/common.h"
#include "common/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.
*/
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, maxfd = 0;
struct if_info *ii;
if (iflist == 0) {
syslog(LOG_ERR, "no interfaces");
exit(0);
}
if (iflist->fd != -1)
if (ioctl(iflist->fd, BIOCGBLEN, (caddr_t)&bufsize) < 0) {
syslog(LOG_ERR, "BIOCGBLEN: %m");
exit(0);
}
buf = malloc(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, NULL, NULL, NULL) < 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, buf, bufsize);
/* Don't choke when we get ptraced */
if (cc < 0 && errno == EINTR)
goto again;
/* Due to a SunOS bug, after 2^31 bytes, the file
* offset overflows and read fails with EINVAL. The
* lseek() to 0 will fix things. */
if (cc < 0) {
if (errno == EINVAL && (lseek(ii->fd, 0,
SEEK_CUR) + bufsize) < 0) {
lseek(ii->fd, 0, SEEK_SET);
goto again;
}
syslog(LOG_ERR, "read: %m");
exit(0);
}
/* Loop through the packet(s) */
#define bhp ((struct bpf_hdr *)bp)
bp = buf;
ep = bp + cc;
while (bp < ep) {
int caplen, hdrlen;
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
mopProcess(ii, bp + hdrlen);
bp += BPF_WORDALIGN(hdrlen + caplen);
}
}
}
}
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