Date: Tue, 24 Jul 2012 09:43:32 +0100 (BST) From: William Waites <wwaites@tardis.ed.ac.uk> To: FreeBSD-gnats-submit@FreeBSD.org Subject: ports/170104: error setting source interface in net/mcast-tools, net/mrouted Message-ID: <20120724084332.2C4B35E58@gallows.inf.ed.ac.uk> Resent-Message-ID: <201207240850.q6O8o3iq084359@freefall.freebsd.org>
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>Number: 170104
>Category: ports
>Synopsis: error setting source interface in net/mcast-tools, net/mrouted
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 24 08:50:03 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: William Waites
>Release: FreeBSD 8.2-RELEASE amd64
>Organization:
University of Stirling
>Environment:
System: FreeBSD gallows.inf.ed.ac.uk 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
Some of the older multicast utilities, such as mcastread and
mcastsend from net/mcast-tools as well as the net/mrouted DVMRP
routing daemon seem to use what must be an old convention for
determining the source address to use. From mcastread.c,
ifindex = if_nametoindex(ifname);
...
/* XXX uses "0.0.0.0/8 for interface index" API */
a.s_addr = htonl(ifindex);
if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_IF,
&a, sizeof(a)) < 0) {
emsg = "setsockopt(IP_MULTICAST_IF)";
if (vflag)
warn("%s", emsg);
close(so);
so = -1;
continue;
}
the comment suggests what is happening here. Nevertheless,
the value that is placed in a.s_addr should be an IP address
that is configured on the system. Done this way it always
fails.
>How-To-Repeat:
# mcastread -v -4 vr0 234.194.35.194 6666
mcastread: trying 234.194.35.194
mcastread: setsockopt(IP_MULTICAST_IF): Can't assign requested address
mcastread: can't allocate socket
Changing the a.s_addr assignment, for example hardcoding
to the result of inet_addr("192.0.2.1") makes the program
work.
>Fix:
All the affected programs need fixed, because they tend to
use the device directly on the command line or in the configuration
file, either their command-line syntax needs changed or some
calls to getifaddrs(3) to determine a suitable address need to
be made, and the results used in this setsockopt call.
No patch as of yet...
--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
>Release-Note:
>Audit-Trail:
>Unformatted:
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