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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <string.h>
#include "logind-acl.h"
#include "util.h"
#include "log.h"
#include "sd-daemon.h"
int main(int argc, char *argv[]) {
int r;
const char *path = NULL, *seat;
char *p, *active_uid = NULL;
unsigned long ul;
bool changed_acl = false;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
if (argc < 2 || argc > 3) {
log_error("This program expects one or two arguments.");
r = -EINVAL;
goto finish;
}
/* Make sure we don't muck around with ACLs the system is not
* running systemd. */
if (!sd_booted())
return 0;
path = argv[1];
seat = argc < 3 || isempty(argv[2]) ? "seat0" : argv[2];
p = strappend("/run/systemd/seats/", seat);
if (!p) {
log_error("Out of memory.");
r = -ENOMEM;
goto finish;
}
r = parse_env_file(p, NEWLINE,
"ACTIVE_UID", &active_uid,
NULL);
free(p);
if (r < 0) {
if (errno == ENOENT) {
r = 0;
goto finish;
}
log_error("Failed to read seat data for %s: %s", seat, strerror(-r));
goto finish;
}
if (active_uid) {
r = safe_atolu(active_uid, &ul);
if (r < 0) {
log_error("Failed to parse active UID value %s: %s", active_uid, strerror(-r));
goto finish;
}
r = devnode_acl(path, true, false, 0, true, (uid_t) ul);
if (r < 0) {
log_error("Failed to apply ACL on %s: %s", path, strerror(-r));
goto finish;
}
changed_acl = true;
}
r = 0;
finish:
if (path && !changed_acl) {
int k;
/* Better be safe that sorry and reset ACL */
k = devnode_acl(path, true, false, 0, false, 0);
if (k < 0) {
log_error("Failed to apply ACL on %s: %s", path, strerror(-k));
if (r >= 0)
r = k;
}
}
free(active_uid);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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