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/* 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"
#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 == '/')
return s;
/* Otherwise, dots become slashes and slashes become
* dots. Fun. */
while (n) {
if (*n == '.')
*n = '/';
else
*n = '.';
n = strpbrk(n + 1, "/.");
}
return 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, (int) strcspn(value, NEWLINE), value);
p = strjoina("/proc/sys/", property);
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) {
char *p;
assert(property);
assert(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;
}
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