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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <poll.h>
#include <sys/inotify.h>
#include "sd-network.h"
#include "alloc-util.h"
#include "env-file.h"
#include "fd-util.h"
#include "fs-util.h"
#include "macro.h"
#include "parse-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
static int network_get_string(const char *field, char **ret) {
_cleanup_free_ char *s = NULL;
int r;
assert_return(ret, -EINVAL);
r = parse_env_file(NULL, "/run/systemd/netif/state", field, &s);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*ret = TAKE_PTR(s);
return 0;
}
_public_ int sd_network_get_operational_state(char **state) {
return network_get_string("OPER_STATE", state);
}
_public_ int sd_network_get_carrier_state(char **state) {
return network_get_string("CARRIER_STATE", state);
}
_public_ int sd_network_get_address_state(char **state) {
return network_get_string("ADDRESS_STATE", state);
}
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(NULL, "/run/systemd/netif/state", key, &s);
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 = (int) strv_length(a);
*ret = TAKE_PTR(a);
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_search_domains(char ***ret) {
return network_get_strv("DOMAINS", ret);
}
_public_ int sd_network_get_route_domains(char ***ret) {
return network_get_strv("ROUTE_DOMAINS", ret);
}
static int network_link_get_string(int ifindex, const char *field, char **ret) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_free_ char *s = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(ret, -EINVAL);
xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
r = parse_env_file(NULL, path, field, &s);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*ret = TAKE_PTR(s);
return 0;
}
static int network_link_get_strv(int ifindex, const char *key, char ***ret) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_strv_free_ char **a = NULL;
_cleanup_free_ char *s = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(ret, -EINVAL);
xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
r = parse_env_file(NULL, path, key, &s);
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 = (int) strv_length(a);
*ret = TAKE_PTR(a);
return r;
}
_public_ int sd_network_link_get_setup_state(int ifindex, char **state) {
return network_link_get_string(ifindex, "ADMIN_STATE", state);
}
_public_ int sd_network_link_get_network_file(int ifindex, char **filename) {
return network_link_get_string(ifindex, "NETWORK_FILE", filename);
}
_public_ int sd_network_link_get_operational_state(int ifindex, char **state) {
return network_link_get_string(ifindex, "OPER_STATE", state);
}
_public_ int sd_network_link_get_carrier_state(int ifindex, char **state) {
return network_link_get_string(ifindex, "CARRIER_STATE", state);
}
_public_ int sd_network_link_get_address_state(int ifindex, char **state) {
return network_link_get_string(ifindex, "ADDRESS_STATE", state);
}
_public_ int sd_network_link_get_dhcp6_client_iaid_string(int ifindex, char **iaid) {
return network_link_get_string(ifindex, "DHCP6_CLIENT_IAID", iaid);
}
_public_ int sd_network_link_get_dhcp6_client_duid_string(int ifindex, char **duid) {
return network_link_get_string(ifindex, "DHCP6_CLIENT_DUID", duid);
}
_public_ int sd_network_link_get_required_for_online(int ifindex) {
_cleanup_free_ char *s = NULL;
int r;
r = network_link_get_string(ifindex, "REQUIRED_FOR_ONLINE", &s);
if (r < 0) {
/* Handle -ENODATA as RequiredForOnline=yes, for compatibility */
if (r == -ENODATA)
return true;
return r;
}
return parse_boolean(s);
}
_public_ int sd_network_link_get_required_operstate_for_online(int ifindex, char **state) {
_cleanup_free_ char *s = NULL;
int r;
assert_return(state, -EINVAL);
r = network_link_get_string(ifindex, "REQUIRED_OPER_STATE_FOR_ONLINE", &s);
if (r < 0) {
if (r != -ENODATA)
return r;
/* For compatibility, assuming degraded. */
s = strdup("degraded");
if (!s)
return -ENOMEM;
}
*state = TAKE_PTR(s);
return 0;
}
_public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) {
return network_link_get_string(ifindex, "LLMNR", llmnr);
}
_public_ int sd_network_link_get_mdns(int ifindex, char **mdns) {
return network_link_get_string(ifindex, "MDNS", mdns);
}
_public_ int sd_network_link_get_dns_over_tls(int ifindex, char **dns_over_tls) {
return network_link_get_string(ifindex, "DNS_OVER_TLS", dns_over_tls);
}
_public_ int sd_network_link_get_dnssec(int ifindex, char **dnssec) {
return network_link_get_string(ifindex, "DNSSEC", dnssec);
}
_public_ int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta) {
return network_link_get_strv(ifindex, "DNSSEC_NTA", nta);
}
_public_ int sd_network_link_get_dns(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "DNS", ret);
}
_public_ int sd_network_link_get_ntp(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "NTP", ret);
}
_public_ int sd_network_link_get_sip(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "SIP", ret);
}
_public_ int sd_network_link_get_search_domains(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "DOMAINS", ret);
}
_public_ int sd_network_link_get_route_domains(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret);
}
_public_ int sd_network_link_get_dns_default_route(int ifindex) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_free_ char *s = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
r = parse_env_file(NULL, path, "DNS_DEFAULT_ROUTE", &s);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
return parse_boolean(s);
}
static int network_link_get_ifindexes(int ifindex, const char *key, int **ret) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_free_ int *ifis = NULL;
_cleanup_free_ char *s = NULL;
size_t allocated = 0, c = 0;
int r;
assert_return(ifindex > 0, -EINVAL);
assert_return(ret, -EINVAL);
xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
r = parse_env_file(NULL, path, key, &s);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
for (const char *x = s;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&x, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
if (!GREEDY_REALLOC(ifis, allocated, c + 2))
return -ENOMEM;
r = ifis[c++] = parse_ifindex(word);
if (r < 0)
return r;
}
if (ifis)
ifis[c] = 0; /* Let's add a 0 ifindex to the end, to be nice */
*ret = TAKE_PTR(ifis);
return c;
}
_public_ int sd_network_link_get_carrier_bound_to(int ifindex, int **ret) {
return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_TO", ret);
}
_public_ int sd_network_link_get_carrier_bound_by(int ifindex, int **ret) {
return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_BY", ret);
}
static int MONITOR_TO_FD(sd_network_monitor *m) {
return (int) (unsigned long) m - 1;
}
static sd_network_monitor* FD_TO_MONITOR(int fd) {
return (sd_network_monitor*) (unsigned long) (fd + 1);
}
static int monitor_add_inotify_watch(int fd) {
int k;
k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE);
if (k >= 0)
return 0;
else if (errno != ENOENT)
return -errno;
k = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR);
if (k >= 0)
return 0;
else if (errno != ENOENT)
return -errno;
k = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR);
if (k < 0)
return -errno;
return 0;
}
_public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) {
_cleanup_close_ int fd = -1;
int 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 = monitor_add_inotify_watch(fd);
if (k < 0)
return k;
good = true;
}
if (!good)
return -EINVAL;
*m = FD_TO_MONITOR(fd);
fd = -1;
return 0;
}
_public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
int fd;
if (m) {
fd = MONITOR_TO_FD(m);
close_nointr(fd);
}
return NULL;
}
_public_ int sd_network_monitor_flush(sd_network_monitor *m) {
union inotify_event_buffer buffer;
struct inotify_event *e;
ssize_t l;
int fd, k;
assert_return(m, -EINVAL);
fd = MONITOR_TO_FD(m);
l = read(fd, &buffer, sizeof(buffer));
if (l < 0) {
if (IN_SET(errno, EAGAIN, EINTR))
return 0;
return -errno;
}
FOREACH_INOTIFY_EVENT(e, buffer, l) {
if (e->mask & IN_ISDIR) {
k = monitor_add_inotify_watch(fd);
if (k < 0)
return k;
k = inotify_rm_watch(fd, e->wd);
if (k < 0)
return -errno;
}
}
return 0;
}
_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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