Merge pull request #13936 from keszybz/format-table-uninhibited

[thirdparty/systemd.git] / src / shared / sysctl-util.c

diff --git a/src/shared/sysctl-util.c b/src/shared/sysctl-util.c
index e1ccb3294c5bd05aa66a85084b06c31bf6acc98c..12fb3ef7ea0e2d58f7f548d65a962163cd1bbc88 100644 (file)
--- a/src/shared/sysctl-util.c
+++ b/src/shared/sysctl-util.c
@@ -1,25 +1,11 @@
-/***
-  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"
@@ -52,14 +38,56 @@ char *sysctl_normalize(char *s) {
 
 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) {
@@ -71,3 +99,25 @@ 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;
+}