getgroups() gives wrong result with nss_winbind

Henrik Nordstrom hno at
Thu Sep 16 22:43:02 GMT 2004

On Thu, 16 Sep 2004, Andreas wrote:

> Nope.
> $ ./bla
> ngroups: 65536


What do you get if you run the following (as root) giving her unix login 
as argument:

#include <grp.h>
#include <pwd.h>
#include <sys/types.h>
#include <assert.h>
#include <stdio.h>

int main(int argc, char **argv)
    struct passwd *pw = getpwnam(argv[1]);
    int rc;

    rc = initgroups(argv[1], pw->pw_gid);
    assert(rc == 0);

    rc = getgroups(0, NULL);

    printf("Number of groups for %s: %d\n", argv[1], rc);

If this returns the correct number then the culpit is the method of login.

If this returns 64 then winbind, winbind_nss or maybe (but unlikely) the 
libc is to blaim..


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