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/* Copyright (C) 1998 Joshua Sled
This file is part of LibGTop 1.0.
Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.
LibGTop 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 of the License,
or (at your option) any later version.
LibGTop 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 LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/open.h>
#include <glibtop/init_hooks.h>
/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
void
glibtop_init_p (glibtop *server, const unsigned long features,
const unsigned flags)
{
const _glibtop_init_func_t *init_fkt;
if (server == NULL)
glibtop_error_r (NULL, "glibtop_init_p (server == NULL)");
/* Do the initialization, but only if not already initialized. */
if ((server->flags & _GLIBTOP_INIT_STATE_SYSDEPS) == 0) {
glibtop_open_p (server, "glibtop", features, flags);
for (init_fkt = _glibtop_init_hook_p; *init_fkt; init_fkt++)
(*init_fkt) (server);
server->flags |= _GLIBTOP_INIT_STATE_SYSDEPS;
}
}
void
glibtop_open_p (glibtop *server, const char *program_name,
const unsigned long features,
const unsigned flags)
{
#ifdef DEBUG
fprintf (stderr, "DEBUG (%d): glibtop_open_p ()\n", getpid ());
#endif
/* !!! WE ARE ROOT HERE - CHANGE WITH CAUTION !!! */
server->machine.uid = getuid ();
server->machine.euid = geteuid ();
server->machine.gid = getgid ();
server->machine.egid = getegid ();
#ifdef __FreeBSD__
server->os_version_code = __FreeBSD_version;
#endif
/* Setup machine-specific data */
server->machine.kd = kvm_open (NULL, NULL, NULL, O_RDONLY, "kvm_open");
if (server->machine.kd == NULL)
glibtop_error_io_r (server, "kvm_open");
/* Drop priviledges. */
if (setreuid (server->machine.euid, server->machine.uid))
_exit (1);
if (setregid (server->machine.egid, server->machine.gid))
_exit (1);
/* !!! END OF SUID ROOT PART !!! */
/* Our effective uid is now those of the user invoking the server,
* so we do no longer have any priviledges. */
/* NOTE: On FreeBSD, we do not need to be suid root, we just need to
* be sgid kmem.
*
* The server will only use setegid() to get back it's priviledges,
* so it will fail if it is suid root and not sgid kmem. */
}
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