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-rw-r--r--src/libsystemd/sd-network/sd-network.c409
1 files changed, 409 insertions, 0 deletions
diff --git a/src/libsystemd/sd-network/sd-network.c b/src/libsystemd/sd-network/sd-network.c
new file mode 100644
index 0000000..812826f
--- /dev/null
+++ b/src/libsystemd/sd-network/sd-network.c
@@ -0,0 +1,409 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <poll.h>
+#include <string.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"
+
+_public_ int sd_network_get_operational_state(char **state) {
+ _cleanup_free_ char *s = NULL;
+ int r;
+
+ assert_return(state, -EINVAL);
+
+ r = parse_env_file(NULL, "/run/systemd/netif/state", "OPER_STATE", &s);
+ if (r == -ENOENT)
+ return -ENODATA;
+ if (r < 0)
+ return r;
+ if (isempty(s))
+ return -ENODATA;
+
+ *state = TAKE_PTR(s);
+
+ 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(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_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_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_timezone(int ifindex, char **ret) {
+ return network_link_get_string(ifindex, "TIMEZONE", ret);
+}
+
+_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_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;
+ const char *x;
+ 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 (x = s;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&x, &word, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = parse_ifindex(word, &ifindex);
+ if (r < 0)
+ return r;
+
+ if (!GREEDY_REALLOC(ifis, allocated, c + 2))
+ return -ENOMEM;
+
+ ifis[c++] = ifindex;
+ }
+
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 23:48:16 +0000