406 lines
11 KiB
C
406 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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Copyright 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <poll.h>
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#include <string.h>
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#include <sys/inotify.h>
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#include "sd-network.h"
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "util.h"
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_public_ int sd_network_get_operational_state(char **state) {
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_cleanup_free_ char *s = NULL;
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int r;
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assert_return(state, -EINVAL);
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r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL);
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if (r == -ENOENT)
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return -ENODATA;
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if (r < 0)
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return r;
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if (isempty(s))
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return -ENODATA;
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*state = TAKE_PTR(s);
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return 0;
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}
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static int network_get_strv(const char *key, char ***ret) {
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_cleanup_strv_free_ char **a = NULL;
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_cleanup_free_ char *s = NULL;
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int r;
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assert_return(ret, -EINVAL);
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r = parse_env_file("/run/systemd/netif/state", NEWLINE, key, &s, NULL);
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if (r == -ENOENT)
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return -ENODATA;
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if (r < 0)
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return r;
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if (isempty(s)) {
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*ret = NULL;
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return 0;
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}
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a = strv_split(s, " ");
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if (!a)
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return -ENOMEM;
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strv_uniq(a);
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r = strv_length(a);
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*ret = TAKE_PTR(a);
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return r;
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}
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_public_ int sd_network_get_dns(char ***ret) {
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return network_get_strv("DNS", ret);
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}
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_public_ int sd_network_get_ntp(char ***ret) {
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return network_get_strv("NTP", ret);
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}
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_public_ int sd_network_get_search_domains(char ***ret) {
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return network_get_strv("DOMAINS", ret);
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}
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_public_ int sd_network_get_route_domains(char ***ret) {
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return network_get_strv("ROUTE_DOMAINS", ret);
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}
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static int network_link_get_string(int ifindex, const char *field, char **ret) {
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char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
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_cleanup_free_ char *s = NULL;
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int r;
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assert_return(ifindex > 0, -EINVAL);
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assert_return(ret, -EINVAL);
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xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
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r = parse_env_file(path, NEWLINE, field, &s, NULL);
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if (r == -ENOENT)
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return -ENODATA;
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if (r < 0)
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return r;
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if (isempty(s))
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return -ENODATA;
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*ret = TAKE_PTR(s);
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return 0;
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}
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static int network_link_get_strv(int ifindex, const char *key, char ***ret) {
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char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
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_cleanup_strv_free_ char **a = NULL;
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_cleanup_free_ char *s = NULL;
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int r;
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assert_return(ifindex > 0, -EINVAL);
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assert_return(ret, -EINVAL);
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xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
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r = parse_env_file(path, NEWLINE, key, &s, NULL);
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if (r == -ENOENT)
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return -ENODATA;
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if (r < 0)
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return r;
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if (isempty(s)) {
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*ret = NULL;
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return 0;
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}
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a = strv_split(s, " ");
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if (!a)
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return -ENOMEM;
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strv_uniq(a);
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r = strv_length(a);
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*ret = TAKE_PTR(a);
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return r;
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}
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_public_ int sd_network_link_get_setup_state(int ifindex, char **state) {
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return network_link_get_string(ifindex, "ADMIN_STATE", state);
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}
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_public_ int sd_network_link_get_network_file(int ifindex, char **filename) {
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return network_link_get_string(ifindex, "NETWORK_FILE", filename);
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}
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_public_ int sd_network_link_get_operational_state(int ifindex, char **state) {
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return network_link_get_string(ifindex, "OPER_STATE", state);
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}
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_public_ int sd_network_link_get_required_for_online(int ifindex) {
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_cleanup_free_ char *s = NULL;
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int r;
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r = network_link_get_string(ifindex, "REQUIRED_FOR_ONLINE", &s);
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if (r < 0) {
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/* Handle -ENODATA as RequiredForOnline=yes, for compatibility */
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if (r == -ENODATA)
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return true;
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return r;
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}
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return parse_boolean(s);
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}
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_public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) {
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return network_link_get_string(ifindex, "LLMNR", llmnr);
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}
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_public_ int sd_network_link_get_mdns(int ifindex, char **mdns) {
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return network_link_get_string(ifindex, "MDNS", mdns);
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}
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_public_ int sd_network_link_get_dnssec(int ifindex, char **dnssec) {
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return network_link_get_string(ifindex, "DNSSEC", dnssec);
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}
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_public_ int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta) {
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return network_link_get_strv(ifindex, "DNSSEC_NTA", nta);
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}
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_public_ int sd_network_link_get_timezone(int ifindex, char **ret) {
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return network_link_get_string(ifindex, "TIMEZONE", ret);
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}
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_public_ int sd_network_link_get_dns(int ifindex, char ***ret) {
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return network_link_get_strv(ifindex, "DNS", ret);
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}
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_public_ int sd_network_link_get_ntp(int ifindex, char ***ret) {
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return network_link_get_strv(ifindex, "NTP", ret);
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}
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_public_ int sd_network_link_get_search_domains(int ifindex, char ***ret) {
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return network_link_get_strv(ifindex, "DOMAINS", ret);
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}
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_public_ int sd_network_link_get_route_domains(int ifindex, char ***ret) {
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return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret);
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}
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static int network_link_get_ifindexes(int ifindex, const char *key, int **ret) {
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char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
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_cleanup_free_ int *ifis = NULL;
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_cleanup_free_ char *s = NULL;
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size_t allocated = 0, c = 0;
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const char *x;
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int r;
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assert_return(ifindex > 0, -EINVAL);
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assert_return(ret, -EINVAL);
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xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
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r = parse_env_file(path, NEWLINE, key, &s, NULL);
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if (r == -ENOENT)
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return -ENODATA;
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if (r < 0)
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return r;
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for (x = s;;) {
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_cleanup_free_ char *word = NULL;
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r = extract_first_word(&x, &word, NULL, 0);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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r = parse_ifindex(word, &ifindex);
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if (r < 0)
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return r;
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if (!GREEDY_REALLOC(ifis, allocated, c + 2))
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return -ENOMEM;
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ifis[c++] = ifindex;
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}
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if (ifis)
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ifis[c] = 0; /* Let's add a 0 ifindex to the end, to be nice */
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*ret = TAKE_PTR(ifis);
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return c;
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}
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_public_ int sd_network_link_get_carrier_bound_to(int ifindex, int **ret) {
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return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_TO", ret);
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}
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_public_ int sd_network_link_get_carrier_bound_by(int ifindex, int **ret) {
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return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_BY", ret);
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}
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static inline int MONITOR_TO_FD(sd_network_monitor *m) {
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return (int) (unsigned long) m - 1;
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}
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static inline sd_network_monitor* FD_TO_MONITOR(int fd) {
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return (sd_network_monitor*) (unsigned long) (fd + 1);
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}
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static int monitor_add_inotify_watch(int fd) {
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int k;
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k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE);
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if (k >= 0)
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return 0;
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else if (errno != ENOENT)
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return -errno;
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k = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR);
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if (k >= 0)
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return 0;
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else if (errno != ENOENT)
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return -errno;
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k = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR);
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if (k < 0)
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return -errno;
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return 0;
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}
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_public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) {
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_cleanup_close_ int fd = -1;
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int k;
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bool good = false;
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assert_return(m, -EINVAL);
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fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (!category || streq(category, "links")) {
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k = monitor_add_inotify_watch(fd);
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if (k < 0)
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return k;
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good = true;
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}
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if (!good)
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return -EINVAL;
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*m = FD_TO_MONITOR(fd);
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fd = -1;
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return 0;
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}
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_public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
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int fd;
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if (m) {
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fd = MONITOR_TO_FD(m);
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close_nointr(fd);
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}
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return NULL;
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}
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_public_ int sd_network_monitor_flush(sd_network_monitor *m) {
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union inotify_event_buffer buffer;
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struct inotify_event *e;
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ssize_t l;
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int fd, k;
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assert_return(m, -EINVAL);
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fd = MONITOR_TO_FD(m);
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l = read(fd, &buffer, sizeof(buffer));
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if (l < 0) {
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if (IN_SET(errno, EAGAIN, EINTR))
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return 0;
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return -errno;
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}
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FOREACH_INOTIFY_EVENT(e, buffer, l) {
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if (e->mask & IN_ISDIR) {
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k = monitor_add_inotify_watch(fd);
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if (k < 0)
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return k;
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k = inotify_rm_watch(fd, e->wd);
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if (k < 0)
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return -errno;
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}
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}
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return 0;
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}
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_public_ int sd_network_monitor_get_fd(sd_network_monitor *m) {
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assert_return(m, -EINVAL);
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return MONITOR_TO_FD(m);
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}
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_public_ int sd_network_monitor_get_events(sd_network_monitor *m) {
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assert_return(m, -EINVAL);
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/* For now we will only return POLLIN here, since we don't
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* need anything else ever for inotify. However, let's have
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* this API to keep our options open should we later on need
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* it. */
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return POLLIN;
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}
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_public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) {
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assert_return(m, -EINVAL);
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assert_return(timeout_usec, -EINVAL);
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/* For now we will only return (uint64_t) -1, since we don't
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* need any timeout. However, let's have this API to keep our
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* options open should we later on need it. */
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*timeout_usec = (uint64_t) -1;
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return 0;
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}
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