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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
commitb750101eb236130cf056c675997decbac904cc49 (patch)
treea5df1a06754bdd014cb975c051c83b01c9a97532 /src/basic/sysctl-util.c
parentInitial commit. (diff)
downloadsystemd-b750101eb236130cf056c675997decbac904cc49.tar.xz
systemd-b750101eb236130cf056c675997decbac904cc49.zip
Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/basic/sysctl-util.c')
-rw-r--r--src/basic/sysctl-util.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/src/basic/sysctl-util.c b/src/basic/sysctl-util.c
new file mode 100644
index 0000000..b66a662
--- /dev/null
+++ b/src/basic/sysctl-util.c
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "af-list.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "macro.h"
+#include "path-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "sysctl-util.h"
+
+char *sysctl_normalize(char *s) {
+ char *n;
+
+ n = strpbrk(s, "/.");
+
+ /* If the first separator is a slash, the path is
+ * assumed to be normalized and slashes remain slashes
+ * and dots remains dots. */
+
+ if (n && *n == '.')
+ /* Dots become slashes and slashes become dots. Fun. */
+ do {
+ if (*n == '.')
+ *n = '/';
+ else
+ *n = '.';
+
+ n = strpbrk(n + 1, "/.");
+ } while (n);
+
+ path_simplify(s);
+
+ /* Kill the leading slash, but keep the first character of the string in the same place. */
+ if (s[0] == '/' && s[1] != 0)
+ memmove(s, s+1, strlen(s));
+
+ return s;
+}
+
+int sysctl_write(const char *property, const char *value) {
+ char *p;
+
+ assert(property);
+ assert(value);
+
+ p = strjoina("/proc/sys/", property);
+
+ path_simplify(p);
+ if (!path_is_normalized(p))
+ return -EINVAL;
+
+ 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 | WRITE_STRING_FILE_SUPPRESS_REDUNDANT_VIRTUAL);
+}
+
+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(property);
+ assert(value);
+
+ if (!IN_SET(af, AF_INET, AF_INET6))
+ return -EAFNOSUPPORT;
+
+ if (ifname) {
+ if (!ifname_valid_full(ifname, IFNAME_VALID_SPECIAL))
+ return -EINVAL;
+
+ p = strjoina("net/", af_to_ipv4_ipv6(af), "/conf/", ifname, "/", property);
+ } else
+ p = strjoina("net/", af_to_ipv4_ipv6(af), "/", property);
+
+ return sysctl_write(p, value);
+}
+
+int sysctl_read(const char *property, char **ret) {
+ char *p;
+ int r;
+
+ assert(property);
+
+ p = strjoina("/proc/sys/", property);
+
+ path_simplify(p);
+ if (!path_is_normalized(p)) /* Filter out attempts to write to /proc/sys/../../…, just in case */
+ return -EINVAL;
+
+ r = read_full_virtual_file(p, ret, NULL);
+ if (r < 0)
+ return r;
+ if (ret)
+ delete_trailing_chars(*ret, NEWLINE);
+
+ return r;
+}
+
+int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) {
+ const char *p;
+
+ assert(property);
+
+ if (!IN_SET(af, AF_INET, AF_INET6))
+ return -EAFNOSUPPORT;
+
+ if (ifname) {
+ if (!ifname_valid_full(ifname, IFNAME_VALID_SPECIAL))
+ return -EINVAL;
+
+ p = strjoina("net/", af_to_ipv4_ipv6(af), "/conf/", ifname, "/", property);
+ } else
+ p = strjoina("net/", af_to_ipv4_ipv6(af), "/", property);
+
+ return sysctl_read(p, ret);
+}