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authorLennart Poettering <lennart@poettering.net>2011-04-04 03:36:42 +0200
committerLennart Poettering <lennart@poettering.net>2011-04-04 03:36:42 +0200
commit151b190e79e64824552e01849352ca8f6ac7dedb (patch)
treef3df68fb925ba30f180fede850abb053a26c7596 /src/binfmt.c
parentd7cc2987a50e62af6b806f1f56f526cf219a0d97 (diff)
binfmt: add binfmt tool to set up binfmt_misc at boot
Diffstat (limited to 'src/binfmt.c')
-rw-r--r--src/binfmt.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/src/binfmt.c b/src/binfmt.c
new file mode 100644
index 0000000000..6ebd212ee1
--- /dev/null
+++ b/src/binfmt.c
@@ -0,0 +1,187 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 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 <stdlib.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <limits.h>
+
+#include "log.h"
+#include "util.h"
+
+static int delete_rule(const char *rule) {
+ char *x, *fn, *e;
+ int r;
+
+ assert(rule[0]);
+
+ if (!(x = strdup(rule)))
+ return -ENOMEM;
+
+ e = strchrnul(x+1, x[0]);
+ *e = 0;
+
+ asprintf(&fn, "/proc/sys/fs/binfmt_misc/%s", x+1);
+ free(x);
+
+ if (!fn)
+ return -ENOMEM;
+
+ r = write_one_line_file(fn, "-1");
+ free(fn);
+
+ return r;
+}
+
+static int apply_rule(const char *rule) {
+ int r;
+
+ delete_rule(rule);
+
+ if ((r = write_one_line_file("/proc/sys/fs/binfmt_misc/register", rule)) < 0) {
+ log_error("Failed to add binary format: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+static int apply_file(const char *path, bool ignore_enoent) {
+ FILE *f;
+ int r = 0;
+
+ assert(path);
+
+ if (!(f = fopen(path, "re"))) {
+ if (ignore_enoent && errno == ENOENT)
+ return 0;
+
+ log_error("Failed to open file '%s', ignoring: %m", path);
+ return -errno;
+ }
+
+ while (!feof(f)) {
+ char l[LINE_MAX], *p;
+ int k;
+
+ if (!fgets(l, sizeof(l), f)) {
+ if (feof(f))
+ break;
+
+ log_error("Failed to read file '%s', ignoring: %m", path);
+ r = -errno;
+ goto finish;
+ }
+
+ p = strstrip(l);
+
+ if (!*p)
+ continue;
+
+ if (strchr(COMMENTS, *p))
+ continue;
+
+ if ((k = apply_rule(p)) < 0 && r == 0)
+ r = k;
+ }
+
+finish:
+ fclose(f);
+
+ return r;
+}
+
+static int scandir_filter(const struct dirent *d) {
+ assert(d);
+
+ if (ignore_file(d->d_name))
+ return 0;
+
+ if (d->d_type != DT_REG &&
+ d->d_type != DT_LNK &&
+ d->d_type != DT_UNKNOWN)
+ return 0;
+
+ return endswith(d->d_name, ".conf");
+}
+
+static int apply_tree(const char *path) {
+ struct dirent **de = NULL;
+ int n, i, r = 0;
+
+ if ((n = scandir(path, &de, scandir_filter, alphasort)) < 0) {
+
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("Failed to enumerate %s files: %m", path);
+ return -errno;
+ }
+
+ for (i = 0; i < n; i++) {
+ char *fn;
+ int k;
+
+ k = asprintf(&fn, "%s/%s", path, de[i]->d_name);
+ free(de[i]);
+
+ if (k < 0) {
+ log_error("Failed to allocate file name.");
+
+ if (r == 0)
+ r = -ENOMEM;
+ continue;
+ }
+
+ if ((k = apply_file(fn, true)) < 0 && r == 0)
+ r = k;
+ }
+
+ free(de);
+
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ int r = 0;
+
+ if (argc > 2) {
+ log_error("This program expects one or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ if (argc > 1)
+ r = apply_file(argv[1], false);
+ else {
+ /* Flush out all rules */
+ write_one_line_file("/proc/sys/fs/binfmt_misc/status", "-1");
+
+ r = apply_tree("/etc/binfmt.d");
+ }
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}