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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
Copyright 2014 Tom Gundersen
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/>.
***/
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include <net/if.h>
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "fileio.h"
#include "sd-network.h"
#include "network-internal.h"
_public_ int sd_network_get_operational_state(char **state) {
_cleanup_free_ char *s = NULL;
int r;
assert_return(state, -EINVAL);
r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*state = s;
s = NULL;
return 0;
}
static int network_get_strv(const char *key, char ***ret) {
_cleanup_strv_free_ char **a = NULL;
_cleanup_free_ char *s = NULL;
int r;
assert_return(ret, -EINVAL);
r = parse_env_file("/run/systemd/netif/state", NEWLINE, key, &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s)) {
*ret = NULL;
return 0;
}
a = strv_split(s, " ");
if (!a)
return -ENOMEM;
strv_uniq(a);
r = strv_length(a);
*ret = a;
a = NULL;
return r;
}
_public_ int sd_network_get_dns(char ***ret) {
return network_get_strv("DNS", ret);
}
_public_ int sd_network_get_ntp(char ***ret) {
return network_get_strv("NTP", ret);
}
_public_ int sd_network_get_link_state(int ifindex, char **state) {
_cleanup_free_ char *s = NULL, *p = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(state, -EINVAL);
if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*state = s;
s = NULL;
return 0;
}
_public_ int sd_network_get_link_operational_state(int ifindex, char **state) {
_cleanup_free_ char *s = NULL, *p = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(state, -EINVAL);
if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*state = s;
s = NULL;
return 0;
}
_public_ int sd_network_get_link_llmnr(int ifindex, char **llmnr) {
_cleanup_free_ char *s = NULL, *p = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(llmnr, -EINVAL);
if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "LLMNR", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*llmnr = s;
s = NULL;
return 0;
}
static int network_get_link_strv(const char *key, int ifindex, char ***ret) {
_cleanup_free_ char *p = NULL, *s = NULL;
_cleanup_strv_free_ char **a = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(ret, -EINVAL);
if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, key, &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s)) {
*ret = NULL;
return 0;
}
a = strv_split(s, " ");
if (!a)
return -ENOMEM;
strv_uniq(a);
r = strv_length(a);
*ret = a;
a = NULL;
return r;
}
_public_ int sd_network_get_link_dns(int ifindex, char ***ret) {
return network_get_link_strv("DNS", ifindex, ret);
}
_public_ int sd_network_get_link_ntp(int ifindex, char ***ret) {
return network_get_link_strv("NTP", ifindex, ret);
}
static inline int MONITOR_TO_FD(sd_network_monitor *m) {
return (int) (unsigned long) m - 1;
}
static inline sd_network_monitor* FD_TO_MONITOR(int fd) {
return (sd_network_monitor*) (unsigned long) (fd + 1);
}
_public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) {
int fd, k;
bool good = false;
assert_return(m, -EINVAL);
fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (fd < 0)
return -errno;
if (!category || streq(category, "links")) {
k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!good) {
close_nointr(fd);
return -EINVAL;
}
*m = FD_TO_MONITOR(fd);
return 0;
}
_public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
int fd;
assert_return(m, NULL);
fd = MONITOR_TO_FD(m);
close_nointr(fd);
return NULL;
}
_public_ int sd_network_monitor_flush(sd_network_monitor *m) {
assert_return(m, -EINVAL);
return flush_fd(MONITOR_TO_FD(m));
}
_public_ int sd_network_monitor_get_fd(sd_network_monitor *m) {
assert_return(m, -EINVAL);
return MONITOR_TO_FD(m);
}
_public_ int sd_network_monitor_get_events(sd_network_monitor *m) {
assert_return(m, -EINVAL);
/* For now we will only return POLLIN here, since we don't
* need anything else ever for inotify. However, let's have
* this API to keep our options open should we later on need
* it. */
return POLLIN;
}
_public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) {
assert_return(m, -EINVAL);
assert_return(timeout_usec, -EINVAL);
/* For now we will only return (uint64_t) -1, since we don't
* need any timeout. However, let's have this API to keep our
* options open should we later on need it. */
*timeout_usec = (uint64_t) -1;
return 0;
}
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