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/* Attempt to undo a previous su
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <hurd.h>
#include <argp.h>
#include <error.h>
#include <version.h>
#include "frobauth.h"
#include "pids.h"
const char *argp_program_version = STANDARD_HURD_VERSION (unsu);
static struct argp_child child_argps[] = {{ &frobauth_no_ugids_argp }, { 0 }};
static char doc[] =
"Attempt to undo a previous su"
"\vThis command is convenient, but will only correctly undo a limited"
" subset of possible su commands. It works by simply deleting all"
" current effective ids and the first two available ids, and then"
" making the first remaining available id the current effective id.";
int
main (int argc, char *argv[])
{
struct frobauth frobauth = FROBAUTH_INIT;
/* Modify UGIDS, to be what PID's new authentication should be, NOISE is
ignored. */
error_t modify (struct ugids *ugids, const struct ugids *noise,
pid_t pid, void *hook)
{
error_t err = 0;
idvec_clear (&ugids->eff_uids);
idvec_clear (&ugids->eff_gids);
idvec_clear (&ugids->imp_eff_gids);
idvec_delete (&ugids->avail_uids, 0);
idvec_delete (&ugids->avail_uids, 0);
idvec_delete (&ugids->avail_gids, 0);
idvec_delete (&ugids->avail_gids, 0);
idvec_keep (&ugids->imp_avail_gids, &ugids->avail_gids);
if (ugids->avail_uids.num > 0)
err = ugids_set_posix_user (ugids, ugids->avail_uids.ids[0]);
return err;
}
void print_info (const struct ugids *new,
const struct ugids *old,
const struct ugids *removed,
pid_t pid, void *hook)
{
char *new_rep = ugids_rep (new, 1, 1, 0, 0, 0);
printf ("%d: Changed auth to %s\n", pid, new_rep);
free (new_rep);
}
struct argp argp = { 0, 0, 0, doc, child_argps };
/* Parse our command line. This shouldn't ever return an error. */
argp_parse (&argp, argc, argv, 0, 0, &frobauth);
if (frobauth_modify (&frobauth, 0, 0, modify, print_info, 0))
return 0;
else
return 1;
}
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