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Add a new program, ether_reflect, which is useful in testing ethernet

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devices and switches.
This commit is contained in:
George V. Neville-Neil 2008-12-23 20:25:04 +00:00
parent d541033521
commit e39eeac77b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=186457
4 changed files with 283 additions and 0 deletions
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1
tools/tools/README
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@ -19,6 +19,7 @@ diffburst OBSOLETE: equivalent functionality is available via split -p.
For example: "split -p ^diff < patchfile". See split(1).
editing Editor modes and the like to help editing FreeBSD code.
epfe Extract printing filter examples from printing.sgml.
ether_reflect An Ethernet packet reflector for low level testing.
find-sb Scan a disk for possible filesystem superblocks.
gdb_regofs A simple tool that prints out a register offset table
for mapping gdb(1) register numbers to struct reg and

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tools/tools/ether_reflect/Makefile Normal file
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#
# $FreeBSD$
#
# A Makefile that builds both the ether_reflect program and its manual page.
PROG= ether_reflect
LDADD+= -lpcap
.include <bsd.prog.mk>

108
tools/tools/ether_reflect/ether_reflect.1 Normal file
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.\" Copyright (c) 2008 George V. Neville-Neil
.\" 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 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd December 23, 2008
.Dt ether_reflect 1
.Os
.Sh NAME
.Nm ether_reflect
.Nd "reflect ethernet packets"
.Sh SYNOPSIS
.Nm
.Op Fl a Ar ethernet address
.Op Fl e Ar ethertype
.Op Fl i Ar interface
.Op Fl t Ar timeout
.Op Fl p
.Op Fl d
.Sh DESCRIPTION
The
.Nm
command implements a simple ethernet packet reflector using the
.Xr PCAP 3
library and
.Xr bpf 4 ,
the Berkeley Packet Filter. The program is useful primarily to test
the low level round trip time of packets through an Ethernet interface
and/or a switch. Network protocols, such as IP, and the network stack
in general are never invoked, only the device driver that implements
the particular interface is executed. As the
.Nm
command uses the
.Xr bpf 4
device the user must have root privileges to execute this program.
.Pp
The options are as follows:
.Bl -tag -width ".Fl d Ar argument"
.It Fl a Ar address
Instead of reversing the ethernet destination and source addresses
supply a different destination ethernet address for each packet
received.
.It Fl e Ar ether type
Use a different ethertype than the default, 0x8822, which is the IEEE
ether type for driver testing.
.It Fl i Ar interface
Network interface, which can be found with ifconfig(1).
.It Fl t Ar timeout
The time, in milliseconds, to wait for a packet. Lower times decrease
latency at the cost of CPU.
.It Fl p
Set the device into promiscuous mode before testing. This is not
usually necessary.
.It Fl d
Debug output. Print various small pieces of debug information.
.El
.Sh EXAMPLES
The following is an example of a typical usage
of the
.Nm
command:
.Pp
.Dl "ether_reflect -i em0 -t 1"
.Pp
Reflect all test packets, those with an ether type of 0x8822, which
are seen on ineterface em0. The timeout is 1 millisecond.
.Pp
.Dl "ether_reflect -i em0 -a 00:00:00:aa:bb:cc -t 1"
.Pp
Rewrite the destination address in each packet to 00:00:00:aa:bb:cc
before reflecting the packet.
.Sh SEE ALSO
.Xr ifconfig 8 ,
.Xr tcpdump 1 ,
.Xr pcap 4 ,
.Xr bpf 2 .
.Sh HISTORY
The
.Nm
program first appeared in
.Fx 8.0 .
.Sh AUTHORS
This
manual page was written by
.An George V. Neville-Neil Aq gnn@FreeBSD.org .
.Sh BUGS
Should be reported to the author or to net@freebsd.org.

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tools/tools/ether_reflect/ether_reflect.c Normal file
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/*
* Copyright (c) 2008, Neville-Neil Consulting
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*
* Author: George V. Neville-Neil
*
* Purpose: This program uses libpcap to read packets from the network
* of a specific ethertype (default is 0x8822) and reflects them back
* out the same interface with their destination and source mac
* addresses reversed.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <unistd.h>
#include <stdlib.h>
#include <strings.h>
#include <pcap-int.h>
#include <pcap.h>
#include <net/ethernet.h>
#define ETHER_TYPE_TEST "0x8822"
#define SNAPLEN 96
#define MAXPROG 128
char errbuf[PCAP_ERRBUF_SIZE];
void usage(char* message) {
if (message != NULL)
printf ("error: %s\n", message);
printf("usage: ether_reflect -i interface -e ethertype "
"-a address -t timeout -p -d\n");
exit(1);
}
int main(int argc, char **argv)
{
int ch;
int debug = 0, promisc = 0;
int timeout = 100;
bpf_u_int32 localnet=0, netmask=0;
unsigned int error = 0;
char *interface = NULL;
char *proto = ETHER_TYPE_TEST;
char in_string[MAXPROG];
char tmp[ETHER_ADDR_LEN];
char addr[ETHER_ADDR_LEN];
char *user_addr = NULL;
pcap_t *capture;
struct bpf_program program;
struct pcap_pkthdr *header;
unsigned char *packet = NULL;
while ((ch = getopt(argc, argv, "a:e:i:t:pd")) != -1) {
switch (ch) {
case 'a':
user_addr = optarg;
break;
case 'e':
proto = optarg;
break;
case 'i':
interface = optarg;
break;
case 'p':
promisc = 1;
break;
case 't':
timeout = atoi(optarg);
break;
case 'd':
debug = 1;
break;
case '?':
default:
usage("invalid arguments");
}
}
argc -= optind;
argv += optind;
if (interface == NULL)
usage("You must specify an interface");
if (user_addr != NULL)
ether_aton_r(user_addr, (struct ether_addr *)&tmp);
if ((capture = pcap_open_live(interface, SNAPLEN, promisc, timeout,
&errbuf[0])) == NULL)
usage(errbuf);
snprintf(&in_string[0], MAXPROG, "ether proto %s\n", proto);
if (pcap_lookupnet(interface, &localnet, &netmask, errbuf) < 0)
usage(errbuf);
if (pcap_compile(capture, &program, in_string, 1, netmask) < 0)
usage(errbuf);
if (pcap_setfilter(capture, &program) < 0)
usage(errbuf);
if (pcap_setdirection(capture, PCAP_D_IN) < 0)
usage(errbuf);
while (1) {
error = pcap_next_ex(capture, &header,
(const unsigned char **)&packet);
if (error == 0)
continue;
if (error == -1)
usage("packet read error");
if (error == -2)
usage("savefile? invalid!");
if (debug) {
printf ("got packet of %d length\n", header->len);
printf ("header %s\n",
ether_ntoa((const struct ether_addr*)
&packet[0]));
printf ("header %s\n",
ether_ntoa((const struct ether_addr*)
&packet[ETHER_ADDR_LEN]));
}
/*
* If the user did not supply an address then we simply
* reverse the source and destination addresses.
*/
if (user_addr == NULL) {
bcopy(packet, &tmp, ETHER_ADDR_LEN);
bcopy(&packet[ETHER_ADDR_LEN], packet, ETHER_ADDR_LEN);
bcopy(&tmp, &packet[ETHER_ADDR_LEN], ETHER_ADDR_LEN);
} else {
bcopy(&tmp, packet, ETHER_ADDR_LEN);
}
if (pcap_inject(capture, packet, header->len) < 0)
if (debug)
pcap_perror(capture, "pcap_inject");
}
}