diff options
Diffstat (limited to 'sysdeps/bsd/open.c')
-rw-r--r-- | sysdeps/bsd/open.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/sysdeps/bsd/open.c b/sysdeps/bsd/open.c new file mode 100644 index 00000000..41d82c44 --- /dev/null +++ b/sysdeps/bsd/open.c @@ -0,0 +1,96 @@ +/* $Id: open.c 2422 2005-12-12 09:38:15Z jamesh $ */ + +/* 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. */ +} |