[BUG] in glibc-2.1.1-6b: gethostbyname broken

[BUG] in glibc-2.1.1-6b: gethostbyname broken

[Martin Costabel]

[-- Attachment #1: Type: text/plain, Size: 632 bytes --]


Under glibc-2.1.1-6b, I cannot do an NFS-mount using the numeric IP
address of the server. Without even consulting the net, mount says:
  mount: can't get address for xx.xx.xx.xx

Under glibc-2.1.1-5b, it works correctly.

I tracked this down to gethostbyname, which doesn't work correctly when
fed a numeric IP address.

If I run the the attached program as
 tstgethbn 193.252.19.78 
I get a correct result when glibc-2.1.1-5b.ppc.rpm is installed, and an
error when glibc-2.1.1-6b.ppc.rpm is installed. Both rpms are from
mirror.linuxppc.org.

Could someone who knows what changed between 5b and 6b please look into
this?

Martin

[-- Attachment #2: tstgethbn.c --]
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/* tstgethbn.c
   Test for gesthostbyname */

#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
int main(int argc, char** argv)
{
   char hostname[65];
   struct hostent *he = NULL;
   struct hostent *he2 = NULL;
   extern int h_errno;
 
   strcpy(hostname, argv[1]);
   printf( " Looking up %s\n", hostname );
 
   he = gethostbyname(hostname);
   if ( h_errno ) {
       printf(" error %d\n", h_errno);
       herror(hostname);
   } 

   if ( he == NULL ){
       printf("No hostname found\n");
      exit(1);
   }

    printf( "\t      Hostname: %s\n", he->h_name );
 
   if ( he->h_addr_list[0] != NULL )
     printf("\t       Address: %s \n", 
	    inet_ntoa(*(struct in_addr *) he->h_addr_list[0]));

   he2 = gethostbyaddr( he->h_addr_list[0], he->h_length, he->h_addrtype );
   printf( "\t          Name: %s\n", he2->h_name );

   exit(0);
}
  

Re: [BUG] in glibc-2.1.1-6b: gethostbyname broken

[Franz Sirl]

Am Sat, 08 May 1999 schrieb Martin Costabel:
>>
>Under glibc-2.1.1-6b, I cannot do an NFS-mount using the numeric IP
>address of the server. Without even consulting the net, mount says:
>  mount: can't get address for xx.xx.xx.xx
>
>Under glibc-2.1.1-5b, it works correctly.
>
>I tracked this down to gethostbyname, which doesn't work correctly when
>fed a numeric IP address.
>
>If I run the the attached program as
> tstgethbn 193.252.19.78 
>I get a correct result when glibc-2.1.1-5b.ppc.rpm is installed, and an
>error when glibc-2.1.1-6b.ppc.rpm is installed. Both rpms are from
>mirror.linuxppc.org.
>
>Could someone who knows what changed between 5b and 6b please look into
>this?

Fixed in glibc-2.1.1-6c. This was a general bug in glibc-2.1.1pre2, I've
updated to a current glibc CVS snapshot which fixes it.

Thanks for your report.

Franz.

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