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/* Copyright (C) 2018 Benoît Dejean
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/cpu.h>
#include <glibtop/open.h>
#include <glibtop/init_hooks.h>
#include <glibtop/machine.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)
{
glibtop_debug ("glibtop_open_p ()");
/* !!! WE ARE ROOT HERE - CHANGE WITH CAUTION !!! */
server->machine->uid = getuid ();
server->machine->euid = geteuid ();
server->machine->gid = getgid ();
server->machine->egid = getegid ();
/* Drop priviledges. */
glibtop_debug ("uid=%d euid=%d gid=%d egid=%d", getuid(), geteuid(), getgid(), getegid());
if (setreuid (server->machine->euid, server->machine->uid))
_exit (1);
if (setregid (server->machine->egid, server->machine->gid))
_exit (1);
glibtop_debug ("uid=%d euid=%d gid=%d egid=%d", getuid(), geteuid(), getgid(), getegid());
/* !!! 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. */
}
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