Re: OpenLDAP API -- ldap_unbind SIGPIPE

[Kervin Pierre <kpierre@fit.edu>]

hi,

Thanks for the follow-up.

I think this is a bug.  The ldap_unbind code should check that the 
socket is still writeable before trying to write to it ( maybe using 
fstat(2) ??)

--Kervin


Igor Brezac wrote:
> Pierre,
>
> I figured it out.  The os is raising SIGPIPE (write() to a broken socket)
> and by default it terminates the program.  I just needed to ignore the
> signal or write a special handler for it.  Thanks for you help...
>
> -Igor
>
> On Tue, 2 Apr 2002, Igor Brezac wrote:
>
>
> > I do not have gdb, but adb is available.  I do not get core dump in this
> > example.  The following is the output:
> >
> > # ./a.out
> > ldap_search_st() error Can't contact LDAP server
> > Broken Pipe
> >
> > I do not expect "Broken Pipe".  I traced it to ldap_send_unbind()
> > call in libldap.so.
> >
> > I added
> > debug = 0x00028;
> > ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, &(debug));
> > after ldap_initialize() call and I get the following output.
> >
> > # ./a.out
> > request 1 done
> > ber_get_next failed.
> > LDAP: Can't contact LDAP server
> > Broken Pipe
> >
> > I hope that this will help.
> >
> > -Igor
> >
> > On Tue, 2 Apr 2002, Kervin Pierre wrote:
> >
> >
> > > Do you have gdb installed? How about a full backtrace on the core file.
> > >
> > > Igor Brezac wrote:
> > >
> > > > Hello,
> > > >
> > > > I tried to send this message to openldap-software, but I did not have
> > > > much luck there.  So, maybe some of you guys may be able to help me.
> > > >
> > > > I use Solaris 8 and openldap 2.0.23.  The following short program crashes
> > > > on the ldap_unbind() call.  I tried various different versions of this
> > > > program without success.  Am I doing something wrong here?
> > > >
> > > > Your help will be greatly appreciated.
> > > >
> > > > -Igor
> > > >
> > > > #include        <sys/types.h>
> > > > #include        <stdlib.h>
> > > >
> > > > #include        <lber.h>
> > > > #include        <ldap.h>
> > > >
> > > > int main() {
> > > >
> > > >        int rc;
> > > >        LDAP   *ldi;
> > > >        struct timeval tv;
> > > >        LDAPMessage *res = NULL;
> > > >        LDAPMessage *msg = NULL;
> > > >        char *dn;
> > > >        char *server = "ldap://10.1.1.197/";;
> > > >        char *base_dn = "o=pb";
> > > >        char *filter = "uid=igor";
> > > >        char *attrs[] = {"dn",NULL};
> > > >
> > > >
> > > >        rc = ldap_initialize(&ldi, server);
> > > >        if (rc != LDAP_SUCCESS) {
> > > >                exit (2);
> > > >        }
> > > >
> > > >        rc = ldap_simple_bind_s(ldi, "", "");
> > > >        if (rc != LDAP_SUCCESS) {
> > > >                exit (2);
> > > >        }
> > > >
> > > > //  If the ldap server is no longer available at this point
> > > >
> > > >        tv.tv_sec = 5;
> > > >        tv.tv_usec = 0;
> > > >        rc = ldap_search_st(ldi, base_dn, LDAP_SCOPE_SUBTREE, filter,
> > > >                        (char **) attrs, 0, &tv, &res);
> > > >
> > > >        if (rc != LDAP_SUCCESS) {
> > > >                ldap_get_option(ldi, LDAP_OPT_ERROR_NUMBER, &rc);
> > > >                printf("ldap_search_st() error %s\n", ldap_err2string(rc));
> > > >                ldap_msgfree(res);
> > > >                ldap_unbind(ldi);
> > > >
> > > > // ldap_unbind will cause a dump here
> > > >
> > > >                exit(2);
> > > >        }
> > > >
> > > >        msg = ldap_first_entry(ldi, res);
> > > >        dn = ldap_get_dn(ldi, msg);
> > > >        printf("DN: %s\n", dn);
> > > >
> > > >        ldap_msgfree(msg);
> > > >        free(dn);
> > > >        ldap_unbind_s(ldi);
> > > >        exit (1);
> > > > }



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