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Diffstat (limited to 'src/grp-initprogs/systemd-binfmt/binfmt.c')
-rw-r--r--src/grp-initprogs/systemd-binfmt/binfmt.c203
1 files changed, 203 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-binfmt/binfmt.c b/src/grp-initprogs/systemd-binfmt/binfmt.c
new file mode 100644
index 0000000000..39bbdb5335
--- /dev/null
+++ b/src/grp-initprogs/systemd-binfmt/binfmt.c
@@ -0,0 +1,203 @@
+/***
+ 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 "basic/alloc-util.h"
+#include "basic/conf-files.h"
+#include "basic/def.h"
+#include "basic/fd-util.h"
+#include "basic/fileio.h"
+#include "basic/log.h"
+#include "basic/string-util.h"
+#include "basic/strv.h"
+#include "basic/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;
+}