Date: Mon, 23 Mar 1998 23:10:06 -0800 (PST) From: dan@dpcsys.com To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/6121: bug in gethostbyname 2.2.5 Message-ID: <199803240710.XAA07548@calafia.beach.net>
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>Number: 6121
>Category: bin
>Synopsis: gethostbyname(3) no longer returns NO_DATA for MX records
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Mar 23 23:20:01 PST 1998
>Last-Modified:
>Originator: Dan Busarow
>Organization:
DPC Systems
>Release: FreeBSD 2.2.5-RELEASE i386
>Environment:
NA ?
>Description:
gethostbyname is documented to return NO_DATA when given a hostname
that has no A record but does have some other RR, specifically an
MX record in my case. This has been working though I think the
latest release I know for a fact that it works on is 2.1.5, maybe
2.2-R. I'll see if I can bring it any closer to the present.
The following code demonstrates the problem.
>How-To-Repeat:
Run with an argument of the host to check, i.e. ./tgethost beach.net
(which succeeds, beach.net has an A record) or ./tgethost penofin.com
(which fails, penofin.com only has an MX record. It should return NO_DATA)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
extern int h_errno;
char errbuf[200];
main(int argc, char **argv)
{
struct hostent *he;
char host[64];
long rc = 0;
int error = 0;
strcpy(host, argv[1]);
sprintf(errbuf, "%s.", host);
he = gethostbyname(errbuf);
if(he == (struct hostent *)NULL)
{
switch(h_errno)
{
case HOST_NOT_FOUND:
printf("|%s| HOST_NOT_FOUND\n", errbuf);
error = 1;
break;
case NO_RECOVERY:
printf("|%s| NO_RECOVERY\n", errbuf);
error = 1;
break;
case TRY_AGAIN:
printf("|%s| TRY_AGAIN\n", errbuf);
error = 1;
break;
case NO_DATA:
printf("|%s| NO_DATA\n", errbuf);
error = 0;
break;
}
}
printf("%s %s\n", host, error ? "is bad" : "is good");
if(error)
printf("error is %s\n", hstrerror(h_errno));
exit(0);
}
>Fix:
I'll look when I have time but this *must* have shown up
elsewhere. I see a related outstanding PR for gethostbyname
failing with high file descriptors.
My FD_SETSIZE is 256 and open_max is 64.
Dan
>Audit-Trail:
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