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Add a new program to the multicast test suite. The mcgrab program
is used to grab and hold some number of multicast addresses in order to test what happens when an interface goes over the number of multicast addresses it can filter in hardware.
This commit is contained in:
George V. Neville-Neil
parent
401989b00b
commit
ebcc69dad3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=180394
@ -3,7 +3,9 @@
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#
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# A Makefile that builds both the mctest program and its manual page.
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PROG_CXX= mctest
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PROG_CXX= mctest
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PROG_CXX= mcgrab
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LDADD+= -lpthread
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.include <bsd.prog.mk>
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78
tools/tools/mctest/mcgrab.1
Normal file
78
tools/tools/mctest/mcgrab.1
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@ -0,0 +1,78 @@
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.\" Copyright (c) 2008 George V. Neville-Neil
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 9, 2008
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.Dt mcgrab 1
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.Os
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.Sh NAME
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.Nm mcgrab
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.Nd "multicast filter overload test"
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.Sh SYNOPSIS
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.Nm
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.Op Fl i Ar interface
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.Op Fl g Ar group
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.Op Fl n Ar number
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.Sh DESCRIPTION
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The
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.Nm
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command implements a multicast test which grabs and holds
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N multicast addresses. The purpose of the test is to see what
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happens when a network interface is no longer able to filter
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multicasts in hardware and has to switch to promiscious or
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multicast promiscious mode. A successful test does not have any
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result, but an unsuccessful test will have deleterious side effects.
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Packet size in bytes.
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The options are as follows:
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.Bl -tag -width ".Fl d Ar argument"
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.It Fl i Ar interface
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Network interface, which can be found with ifconfig(1).
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.It Fl i Ar group
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Multicast group
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.It Fl n Ar number
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Number of groups to join.
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.Sh EXAMPLES
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The following is an example of a typical usage
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of the
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.Nm
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command:
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.Pp
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.Dl "mcgrab -i em0 -g 239.255.255.1 -n 1024"
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.Sh SEE ALSO
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.Xr mctest 1 ,
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.Xr ifconfig 8 ,
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.Xr netstat 1 ,
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.Xr nanosleep 2 .
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.Sh HISTORY
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The
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.Nm
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program first appeared in
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.Fx 7.0 .
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.Sh AUTHORS
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This
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manual page was written by
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.An George V. Neville-Neil Aq gnn@FreeBSD.org .
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.Sh BUGS
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Should be reported to the author or to net@freebsd.org.
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189
tools/tools/mctest/mcgrab.cc
Normal file
189
tools/tools/mctest/mcgrab.cc
Normal file
@ -0,0 +1,189 @@
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//
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// Copyright (c) 2008, Neville-Neil Consulting
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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//
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// This test simply grabs N multicast addresses starting
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// from a base address. The purpose is to make sure that switching a device
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// from using a multicast filtering table or function to promiscuous
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// multicast listening mode does not cause deleterious side effects.
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//
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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// C++ STL and other related includes
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#include <stdlib.h>
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#include <limits.h>
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#include <iostream>
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#include <string.h>
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#include <string>
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// Operating System and other C based includes
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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// Private include files
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#include "mctest.h"
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using namespace std;
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//
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// usage - just the program's usage line
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//
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//
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void usage()
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{
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cout << "mcgrab -i interface -g multicast group -n number of groups\n";
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exit(-1);
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}
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//
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// usage - print out the usage with a possible message and exit
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//
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// \param message optional string
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//
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//
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void usage(string message)
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{
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cerr << message << endl;
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usage();
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}
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//
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// grab a set of addresses
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//
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// @param interface ///< text name of the interface (em0 etc.)
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// @param group ///< multicast group
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// @param number ///< number of addresses to grab
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//
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// @return 0 for 0K, -1 for error, sets errno
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//
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void grab(char *interface, struct in_addr *group, int number) {
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int sock;
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struct ip_mreq mreq;
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struct ifreq ifreq;
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struct in_addr lgroup;
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if (group == NULL) {
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group = &lgroup;
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if (inet_pton(AF_INET, DEFAULT_GROUP, group) < 1)
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return;
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}
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if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror("failed to open datagram socket");
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return;
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}
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for (int i = 0; i < number; i++) {
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bzero((struct ip_mreq *)&mreq, sizeof(mreq));
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bzero((struct ifreq *)&ifreq, sizeof(ifreq));
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strncpy(ifreq.ifr_name, interface, IFNAMSIZ);
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if (ioctl(sock, SIOCGIFADDR, &ifreq) < 0) {
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perror("no such interface");
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return;
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}
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memcpy(&mreq.imr_interface,
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&((struct sockaddr_in*) &ifreq.ifr_addr)->sin_addr,
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sizeof(struct in_addr));
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mreq.imr_multiaddr.s_addr = group->s_addr;
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if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
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sizeof(mreq)) < 0) {
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perror("failed to add membership");
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return;
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}
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if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF,
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&((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr,
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sizeof(struct in_addr)) < 0) {
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perror("failed to bind interface");
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return;
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}
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group->s_addr = htonl(ntohl(group->s_addr) + 1);
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}
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printf("Press Control-C to exit.\n");
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sleep(INT_MAX);
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}
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//
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// main - the main program
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//
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// \param -g multicast group address which we will hold
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// \param -i interface on which we're holding the address
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//
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//
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int main(int argc, char**argv)
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{
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char ch; ///< character from getopt()
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extern char* optarg; ///< option argument
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char* interface = 0; ///< Name of the interface
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struct in_addr *group = NULL; ///< the multicast group address
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int number = 0; ///< Number of addresses to grab
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if (argc != 7)
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usage();
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while ((ch = getopt(argc, argv, "g:i:n:h")) != -1) {
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switch (ch) {
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case 'g':
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group = new (struct in_addr );
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if (inet_pton(AF_INET, optarg, group) < 1)
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usage(argv[0] + string(" Error: invalid multicast group") +
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optarg);
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break;
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case 'i':
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interface = optarg;
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break;
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case 'n':
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number = atoi(optarg);
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break;
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case 'h':
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usage(string("Help\n"));
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break;
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}
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}
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grab(interface, group, number);
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}
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