Date: Sun, 9 Jul 2000 22:22:58 -0700 (PDT) From: Bill Fenner <fenner@research.att.com> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/19816: getnameinfo() dumps core on 131.118.32.4 Message-ID: <200007100522.WAA15748@fenestro.attlabs.att.com>
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>Number: 19816
>Category: bin
>Synopsis: getnameinfo() dumps core on 131.118.32.4
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Jul 09 22:30:03 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Bill Fenner
>Release: FreeBSD 4.0-STABLE i386
>Organization:
AT&T Labs - Research
>Environment:
>Description:
getnameinfo() dumps core on 131.118.32.4
It assumes that getipnodebyaddr() can not return an hp->h_name of NULL.
However, it can, with the odd PTR record that 131.118.32.4 has:
4.32.118.131.in-addr.arpa. 1D IN PTR .
I don't know if this is a bug in getipnodebyaddr() or getnameinfo().
>How-To-Repeat:
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
int
main(int argc,char **argv)
{
struct sockaddr_in sin;
char _hostname[256];
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_addr.s_addr = inet_addr("131.118.32.4");
getnameinfo((struct sockaddr*)&sin, sin.sin_len,
_hostname, sizeof(_hostname) - 1, NULL, 0,
NI_NAMEREQD);
}
>Fix:
Unknown.
Workaround: don't try to look up this IP address using getnameinfo().
>Release-Note:
>Audit-Trail:
>Unformatted:
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