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/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "def.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
static const char conf_file_dirs[] = CONF_PATHS_NULSTR("binfmt.d");
static int delete_rule(const char *rule) {
_cleanup_free_ char *x = NULL, *fn = NULL;
char *e;
assert(rule[0]);
x = strdup(rule);
if (!x)
return log_oom();
e = strchrnul(x+1, x[0]);
*e = 0;
fn = strappend("/proc/sys/fs/binfmt_misc/", x+1);
if (!fn)
return log_oom();
return write_string_file(fn, "-1", 0);
}
static int apply_rule(const char *rule) {
int r;
delete_rule(rule);
r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, 0);
if (r < 0)
return log_error_errno(r, "Failed to add binary format: %m");
return 0;
}
static int apply_file(const char *path, bool ignore_enoent) {
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(path);
r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
if (r < 0) {
if (ignore_enoent && r == -ENOENT)
return 0;
return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
}
log_debug("apply: %s", path);
for (;;) {
char l[LINE_MAX], *p;
int k;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
}
p = strstrip(l);
if (!*p)
continue;
if (strchr(COMMENTS "\n", *p))
continue;
k = apply_rule(p);
if (k < 0 && r == 0)
r = k;
}
return r;
}
static void help(void) {
printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
"Registers binary formats.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
, program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
return 1;
}
int main(int argc, char *argv[]) {
int r, k;
r = parse_argv(argc, argv);
if (r <= 0)
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
r = 0;
if (argc > optind) {
int i;
for (i = optind; i < argc; i++) {
k = apply_file(argv[i], false);
if (k < 0 && r == 0)
r = k;
}
} else {
_cleanup_strv_free_ char **files = NULL;
char **f;
r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
if (r < 0) {
log_error_errno(r, "Failed to enumerate binfmt.d files: %m");
goto finish;
}
/* Flush out all rules */
write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", 0);
STRV_FOREACH(f, files) {
k = apply_file(*f, true);
if (k < 0 && r == 0)
r = k;
}
}
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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