-/*-*- 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 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/>.
-***/
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#include <errno.h>
+#include <fcntl.h>
#include <stdio.h>
-#include <string.h>
+#include <unistd.h>
+#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "macro.h"
int sysctl_write(const char *property, const char *value) {
char *p;
+ _cleanup_close_ int fd = -1;
assert(property);
assert(value);
- log_debug("Setting '%s' to '%s'", property, value);
+ log_debug("Setting '%s' to '%.*s'.", property, (int) strcspn(value, NEWLINE), value);
p = strjoina("/proc/sys/", property);
- return write_string_file(p, value, 0);
+ fd = open(p, O_WRONLY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ if (!endswith(value, "\n"))
+ value = strjoina(value, "\n");
+
+ if (write(fd, value, strlen(value)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int sysctl_writef(const char *property, const char *format, ...) {
+ _cleanup_free_ char *v = NULL;
+ va_list ap;
+ int r;
+
+ va_start(ap, format);
+ r = vasprintf(&v, format, ap);
+ va_end(ap);
+
+ if (r < 0)
+ return -ENOMEM;
+
+ return sysctl_write(property, v);
+}
+
+int sysctl_write_ip_property(int af, const char *ifname, const char *property, const char *value) {
+ const char *p;
+
+ assert(IN_SET(af, AF_INET, AF_INET6));
+ assert(property);
+ assert(value);
+
+ p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6",
+ ifname ? "/conf/" : "", strempty(ifname),
+ property[0] == '/' ? "" : "/", property);
+
+ log_debug("Setting '%s' to '%s'", p, value);
+
+ return write_string_file(p, value, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
}
int sysctl_read(const char *property, char **content) {
p = strjoina("/proc/sys/", property);
return read_full_file(p, content, NULL);
}
+
+int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) {
+ _cleanup_free_ char *value = NULL;
+ const char *p;
+ int r;
+
+ assert(IN_SET(af, AF_INET, AF_INET6));
+ assert(property);
+
+ p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6",
+ ifname ? "/conf/" : "", strempty(ifname),
+ property[0] == '/' ? "" : "/", property);
+
+ r = read_one_line_file(p, &value);
+ if (r < 0)
+ return r;
+
+ if (ret)
+ *ret = TAKE_PTR(value);
+
+ return r;
+}