mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 16:37:19 +09:00
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "af-list.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "path-util.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "sysctl-util.h"
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char *sysctl_normalize(char *s) {
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char *n;
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n = strpbrk(s, "/.");
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/* If the first separator is a slash, the path is
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* assumed to be normalized and slashes remain slashes
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* and dots remains dots. */
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if (n && *n == '.')
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/* Dots become slashes and slashes become dots. Fun. */
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do {
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if (*n == '.')
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*n = '/';
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else
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*n = '.';
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n = strpbrk(n + 1, "/.");
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} while (n);
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path_simplify(s);
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/* Kill the leading slash, but keep the first character of the string in the same place. */
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if (s[0] == '/' && s[1] != 0)
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memmove(s, s+1, strlen(s));
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return s;
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}
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int sysctl_write(const char *property, const char *value) {
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char *p;
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assert(property);
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assert(value);
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p = strjoina("/proc/sys/", property);
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path_simplify(p);
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if (!path_is_normalized(p))
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return -EINVAL;
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log_debug("Setting '%s' to '%s'", p, value);
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return write_string_file(p, value, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
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}
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int sysctl_writef(const char *property, const char *format, ...) {
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_cleanup_free_ char *v = NULL;
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va_list ap;
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int r;
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va_start(ap, format);
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r = vasprintf(&v, format, ap);
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va_end(ap);
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if (r < 0)
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return -ENOMEM;
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return sysctl_write(property, v);
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}
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int sysctl_write_ip_property(int af, const char *ifname, const char *property, const char *value) {
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const char *p;
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assert(property);
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assert(value);
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if (!IN_SET(af, AF_INET, AF_INET6))
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return -EAFNOSUPPORT;
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if (ifname) {
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if (!ifname_valid_full(ifname, IFNAME_VALID_SPECIAL))
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return -EINVAL;
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p = strjoina("net/", af_to_ipv4_ipv6(af), "/conf/", ifname, "/", property);
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} else
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p = strjoina("net/", af_to_ipv4_ipv6(af), "/", property);
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return sysctl_write(p, value);
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}
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int sysctl_read(const char *property, char **ret) {
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char *p;
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int r;
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assert(property);
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p = strjoina("/proc/sys/", property);
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path_simplify(p);
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if (!path_is_normalized(p)) /* Filter out attempts to write to /proc/sys/../../…, just in case */
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return -EINVAL;
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r = read_full_virtual_file(p, ret, NULL);
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if (r < 0)
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return r;
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if (ret)
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delete_trailing_chars(*ret, NEWLINE);
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return r;
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}
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int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) {
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const char *p;
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assert(property);
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if (!IN_SET(af, AF_INET, AF_INET6))
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return -EAFNOSUPPORT;
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if (ifname) {
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if (!ifname_valid_full(ifname, IFNAME_VALID_SPECIAL))
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return -EINVAL;
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p = strjoina("net/", af_to_ipv4_ipv6(af), "/conf/", ifname, "/", property);
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} else
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p = strjoina("net/", af_to_ipv4_ipv6(af), "/", property);
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return sysctl_read(p, ret);
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}
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