do it themselves. (Some of these programs actually depended on this beyond compiling the definition of struct ifinfo!) Also fix up some other #include messes while we're at it.
425 lines
10 KiB
C
425 lines
10 KiB
C
/*
|
|
* Copyright (c) 1988, 1992 The University of Utah and the Center
|
|
* for Software Science (CSS).
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Center for Software Science of the University of Utah Computer
|
|
* Science Department. CSS requests users of this software to return
|
|
* to css-dist@cs.utah.edu any improvements that they make and grant
|
|
* CSS redistribution rights.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* @(#)bpf.c 8.1 (Berkeley) 6/4/93
|
|
* $Id: bpf.c,v 1.3 1996/09/22 21:54:25 wosch Exp $
|
|
*
|
|
* Utah $Hdr: bpf.c 3.1 92/07/06$
|
|
* Author: Jeff Forys, University of Utah CSS
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)bpf.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/bpf.h>
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include "defs.h"
|
|
#include "pathnames.h"
|
|
|
|
static int BpfFd = -1;
|
|
static unsigned BpfLen = 0;
|
|
static u_char *BpfPkt = NULL;
|
|
|
|
/*
|
|
** BpfOpen -- Open and initialize a BPF device.
|
|
**
|
|
** Parameters:
|
|
** None.
|
|
**
|
|
** Returns:
|
|
** File descriptor of opened BPF device (for select() etc).
|
|
**
|
|
** Side Effects:
|
|
** If an error is encountered, the program terminates here.
|
|
*/
|
|
int
|
|
BpfOpen()
|
|
{
|
|
struct ifreq ifr;
|
|
char bpfdev[32];
|
|
int n = 0;
|
|
|
|
/*
|
|
* Open the first available BPF device.
|
|
*/
|
|
do {
|
|
(void) sprintf(bpfdev, _PATH_BPF, n++);
|
|
BpfFd = open(bpfdev, O_RDWR);
|
|
} while (BpfFd < 0 && (errno == EBUSY || errno == EPERM));
|
|
|
|
if (BpfFd < 0) {
|
|
syslog(LOG_ERR, "bpf: no available devices: %m");
|
|
Exit(0);
|
|
}
|
|
|
|
/*
|
|
* Set interface name for bpf device, get data link layer
|
|
* type and make sure it's type Ethernet.
|
|
*/
|
|
(void) strncpy(ifr.ifr_name, IntfName, sizeof(ifr.ifr_name));
|
|
if (ioctl(BpfFd, BIOCSETIF, (caddr_t)&ifr) < 0) {
|
|
syslog(LOG_ERR, "bpf: ioctl(BIOCSETIF,%s): %m", IntfName);
|
|
Exit(0);
|
|
}
|
|
|
|
/*
|
|
* Make sure we are dealing with an Ethernet device.
|
|
*/
|
|
if (ioctl(BpfFd, BIOCGDLT, (caddr_t)&n) < 0) {
|
|
syslog(LOG_ERR, "bpf: ioctl(BIOCGDLT): %m");
|
|
Exit(0);
|
|
}
|
|
if (n != DLT_EN10MB) {
|
|
syslog(LOG_ERR,"bpf: %s: data-link type %d unsupported",
|
|
IntfName, n);
|
|
Exit(0);
|
|
}
|
|
|
|
/*
|
|
* On read(), return packets immediately (do not buffer them).
|
|
*/
|
|
n = 1;
|
|
if (ioctl(BpfFd, BIOCIMMEDIATE, (caddr_t)&n) < 0) {
|
|
syslog(LOG_ERR, "bpf: ioctl(BIOCIMMEDIATE): %m");
|
|
Exit(0);
|
|
}
|
|
|
|
/*
|
|
* Try to enable the chip/driver's multicast address filter to
|
|
* grab our RMP address. If this fails, try promiscuous mode.
|
|
* If this fails, there's no way we are going to get any RMP
|
|
* packets so just exit here.
|
|
*/
|
|
#ifdef MSG_EOR
|
|
ifr.ifr_addr.sa_len = RMP_ADDRLEN + 2;
|
|
#endif
|
|
ifr.ifr_addr.sa_family = AF_UNSPEC;
|
|
bcopy(&RmpMcastAddr[0], (char *)&ifr.ifr_addr.sa_data[0], RMP_ADDRLEN);
|
|
if (ioctl(BpfFd, SIOCADDMULTI, (caddr_t)&ifr) < 0) {
|
|
syslog(LOG_WARNING,
|
|
"bpf: can't add mcast addr (%m), setting promiscuous mode");
|
|
|
|
if (ioctl(BpfFd, BIOCPROMISC, (caddr_t)0) < 0) {
|
|
syslog(LOG_ERR, "bpf: can't set promiscuous mode: %m");
|
|
Exit(0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Ask BPF how much buffer space it requires and allocate one.
|
|
*/
|
|
if (ioctl(BpfFd, BIOCGBLEN, (caddr_t)&BpfLen) < 0) {
|
|
syslog(LOG_ERR, "bpf: ioctl(BIOCGBLEN): %m");
|
|
Exit(0);
|
|
}
|
|
if (BpfPkt == NULL)
|
|
BpfPkt = (u_char *)malloc(BpfLen);
|
|
|
|
if (BpfPkt == NULL) {
|
|
syslog(LOG_ERR, "bpf: out of memory (%u bytes for bpfpkt)",
|
|
BpfLen);
|
|
Exit(0);
|
|
}
|
|
|
|
/*
|
|
* Write a little program to snarf RMP Boot packets and stuff
|
|
* it down BPF's throat (i.e. set up the packet filter).
|
|
*/
|
|
{
|
|
#define RMP ((struct rmp_packet *)0)
|
|
static struct bpf_insn bpf_insn[] = {
|
|
{ BPF_LD|BPF_B|BPF_ABS, 0, 0, (long)&RMP->hp_llc.dsap },
|
|
{ BPF_JMP|BPF_JEQ|BPF_K, 0, 5, IEEE_DSAP_HP },
|
|
{ BPF_LD|BPF_H|BPF_ABS, 0, 0, (long)&RMP->hp_llc.cntrl },
|
|
{ BPF_JMP|BPF_JEQ|BPF_K, 0, 3, IEEE_CNTL_HP },
|
|
{ BPF_LD|BPF_H|BPF_ABS, 0, 0, (long)&RMP->hp_llc.dxsap },
|
|
{ BPF_JMP|BPF_JEQ|BPF_K, 0, 1, HPEXT_DXSAP },
|
|
{ BPF_RET|BPF_K, 0, 0, RMP_MAX_PACKET },
|
|
{ BPF_RET|BPF_K, 0, 0, 0x0 }
|
|
};
|
|
#undef RMP
|
|
static struct bpf_program bpf_pgm = {
|
|
sizeof(bpf_insn)/sizeof(bpf_insn[0]), bpf_insn
|
|
};
|
|
|
|
if (ioctl(BpfFd, BIOCSETF, (caddr_t)&bpf_pgm) < 0) {
|
|
syslog(LOG_ERR, "bpf: ioctl(BIOCSETF): %m");
|
|
Exit(0);
|
|
}
|
|
}
|
|
|
|
return(BpfFd);
|
|
}
|
|
|
|
/*
|
|
** BPF GetIntfName -- Return the name of a network interface attached to
|
|
** the system, or 0 if none can be found. The interface
|
|
** must be configured up; the lowest unit number is
|
|
** preferred; loopback is ignored.
|
|
**
|
|
** Parameters:
|
|
** errmsg - if no network interface found, *errmsg explains why.
|
|
**
|
|
** Returns:
|
|
** A (static) pointer to interface name, or NULL on error.
|
|
**
|
|
** Side Effects:
|
|
** None.
|
|
*/
|
|
char *
|
|
BpfGetIntfName(errmsg)
|
|
char **errmsg;
|
|
{
|
|
struct ifreq ibuf[8], *ifrp, *ifend, *mp;
|
|
struct ifconf ifc;
|
|
int fd;
|
|
int minunit, n;
|
|
char *cp;
|
|
static char device[sizeof(ifrp->ifr_name)];
|
|
static char errbuf[128] = "No Error!";
|
|
|
|
if (errmsg != NULL)
|
|
*errmsg = errbuf;
|
|
|
|
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
|
|
(void) strcpy(errbuf, "bpf: socket: %m");
|
|
return(NULL);
|
|
}
|
|
ifc.ifc_len = sizeof ibuf;
|
|
ifc.ifc_buf = (caddr_t)ibuf;
|
|
|
|
#ifdef OSIOCGIFCONF
|
|
if (ioctl(fd, OSIOCGIFCONF, (char *)&ifc) < 0 ||
|
|
ifc.ifc_len < sizeof(struct ifreq)) {
|
|
(void) strcpy(errbuf, "bpf: ioctl(OSIOCGIFCONF): %m");
|
|
return(NULL);
|
|
}
|
|
#else
|
|
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
|
|
ifc.ifc_len < sizeof(struct ifreq)) {
|
|
(void) strcpy(errbuf, "bpf: ioctl(SIOCGIFCONF): %m");
|
|
return(NULL);
|
|
}
|
|
#endif
|
|
ifrp = ibuf;
|
|
ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
|
|
|
|
mp = 0;
|
|
minunit = 666;
|
|
for (; ifrp < ifend; ++ifrp) {
|
|
if (ioctl(fd, SIOCGIFFLAGS, (char *)ifrp) < 0) {
|
|
(void) strcpy(errbuf, "bpf: ioctl(SIOCGIFFLAGS): %m");
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* If interface is down or this is the loopback interface,
|
|
* ignore it.
|
|
*/
|
|
if ((ifrp->ifr_flags & IFF_UP) == 0 ||
|
|
#ifdef IFF_LOOPBACK
|
|
(ifrp->ifr_flags & IFF_LOOPBACK))
|
|
#else
|
|
(strcmp(ifrp->ifr_name, "lo0") == 0))
|
|
#endif
|
|
continue;
|
|
|
|
for (cp = ifrp->ifr_name; !isdigit(*cp); ++cp)
|
|
;
|
|
n = atoi(cp);
|
|
if (n < minunit) {
|
|
minunit = n;
|
|
mp = ifrp;
|
|
}
|
|
}
|
|
|
|
(void) close(fd);
|
|
if (mp == 0) {
|
|
(void) strcpy(errbuf, "bpf: no interfaces found");
|
|
return(NULL);
|
|
}
|
|
|
|
(void) strcpy(device, mp->ifr_name);
|
|
return(device);
|
|
}
|
|
|
|
/*
|
|
** BpfRead -- Read packets from a BPF device and fill in `rconn'.
|
|
**
|
|
** Parameters:
|
|
** rconn - filled in with next packet.
|
|
** doread - is True if we can issue a read() syscall.
|
|
**
|
|
** Returns:
|
|
** True if `rconn' contains a new packet, False otherwise.
|
|
**
|
|
** Side Effects:
|
|
** None.
|
|
*/
|
|
int
|
|
BpfRead(rconn, doread)
|
|
RMPCONN *rconn;
|
|
int doread;
|
|
{
|
|
register int datlen, caplen, hdrlen;
|
|
static u_char *bp = NULL, *ep = NULL;
|
|
int cc;
|
|
|
|
/*
|
|
* The read() may block, or it may return one or more packets.
|
|
* We let the caller decide whether or not we can issue a read().
|
|
*/
|
|
if (doread) {
|
|
if ((cc = read(BpfFd, (char *)BpfPkt, (int)BpfLen)) < 0) {
|
|
syslog(LOG_ERR, "bpf: read: %m");
|
|
return(0);
|
|
} else {
|
|
bp = BpfPkt;
|
|
ep = BpfPkt + cc;
|
|
}
|
|
}
|
|
|
|
#define bhp ((struct bpf_hdr *)bp)
|
|
/*
|
|
* If there is a new packet in the buffer, stuff it into `rconn'
|
|
* and return a success indication.
|
|
*/
|
|
if (bp < ep) {
|
|
datlen = bhp->bh_datalen;
|
|
caplen = bhp->bh_caplen;
|
|
hdrlen = bhp->bh_hdrlen;
|
|
|
|
if (caplen != datlen)
|
|
syslog(LOG_ERR,
|
|
"bpf: short packet dropped (%d of %d bytes)",
|
|
caplen, datlen);
|
|
else if (caplen > sizeof(struct rmp_packet))
|
|
syslog(LOG_ERR, "bpf: large packet dropped (%d bytes)",
|
|
caplen);
|
|
else {
|
|
rconn->rmplen = caplen;
|
|
bcopy((char *)&bhp->bh_tstamp, (char *)&rconn->tstamp,
|
|
sizeof(struct timeval));
|
|
bcopy((char *)bp + hdrlen, (char *)&rconn->rmp, caplen);
|
|
}
|
|
bp += BPF_WORDALIGN(caplen + hdrlen);
|
|
return(1);
|
|
}
|
|
#undef bhp
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
** BpfWrite -- Write packet to BPF device.
|
|
**
|
|
** Parameters:
|
|
** rconn - packet to send.
|
|
**
|
|
** Returns:
|
|
** True if write succeeded, False otherwise.
|
|
**
|
|
** Side Effects:
|
|
** None.
|
|
*/
|
|
int
|
|
BpfWrite(rconn)
|
|
RMPCONN *rconn;
|
|
{
|
|
if (write(BpfFd, (char *)&rconn->rmp, rconn->rmplen) < 0) {
|
|
syslog(LOG_ERR, "write: %s: %m", EnetStr(rconn));
|
|
return(0);
|
|
}
|
|
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
** BpfClose -- Close a BPF device.
|
|
**
|
|
** Parameters:
|
|
** None.
|
|
**
|
|
** Returns:
|
|
** Nothing.
|
|
**
|
|
** Side Effects:
|
|
** None.
|
|
*/
|
|
void
|
|
BpfClose()
|
|
{
|
|
struct ifreq ifr;
|
|
|
|
if (BpfPkt != NULL) {
|
|
free((char *)BpfPkt);
|
|
BpfPkt = NULL;
|
|
}
|
|
|
|
if (BpfFd == -1)
|
|
return;
|
|
|
|
#ifdef MSG_EOR
|
|
ifr.ifr_addr.sa_len = RMP_ADDRLEN + 2;
|
|
#endif
|
|
ifr.ifr_addr.sa_family = AF_UNSPEC;
|
|
bcopy(&RmpMcastAddr[0], (char *)&ifr.ifr_addr.sa_data[0], RMP_ADDRLEN);
|
|
if (ioctl(BpfFd, SIOCDELMULTI, (caddr_t)&ifr) < 0)
|
|
(void) ioctl(BpfFd, BIOCPROMISC, (caddr_t)0);
|
|
|
|
(void) close(BpfFd);
|
|
BpfFd = -1;
|
|
}
|