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-rw-r--r--src/network/sd-network.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/src/network/sd-network.c b/src/network/sd-network.c
new file mode 100644
index 0000000000..7469873664
--- /dev/null
+++ b/src/network/sd-network.c
@@ -0,0 +1,237 @@
+/*-*- 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 "util.h"
+#include "macro.h"
+#include "strv.h"
+#include "fileio.h"
+#include "sd-network.h"
+#include "dhcp-lease-internal.h"
+
+_public_ int sd_network_get_link_state(unsigned index, char **state) {
+ char *p, *s = NULL;
+ int r;
+
+ assert_return(index, -EINVAL);
+ assert_return(state, -EINVAL);
+
+ if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
+ free(p);
+
+ if (r == -ENOENT) {
+ free(s);
+ s = strdup("unknown");
+ if (!s)
+ return -ENOMEM;
+
+ *state = s;
+ return 0;
+ } else if (r < 0) {
+ free(s);
+ return r;
+ } else if (!s)
+ return -EIO;
+
+ *state = s;
+ return 0;
+}
+
+_public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) {
+ sd_dhcp_lease *lease;
+ char *p, *s = NULL;
+ int r;
+
+ assert_return(index, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ } else if (!s)
+ return -EIO;
+
+ r = dhcp_lease_load(s, &lease);
+ if (r < 0)
+ return r;
+
+ *ret = lease;
+
+ return 0;
+}
+
+_public_ int sd_network_get_ifindices(unsigned **indices) {
+ _cleanup_closedir_ DIR *d;
+ int r = 0;
+ unsigned n = 0;
+ _cleanup_free_ uid_t *l = NULL;
+
+ d = opendir("/run/systemd/network/links/");
+ if (!d)
+ return -errno;
+
+ for (;;) {
+ struct dirent *de;
+ int k;
+ unsigned index;
+
+ errno = 0;
+ de = readdir(d);
+ if (!de && errno != 0)
+ return -errno;
+
+ if (!de)
+ break;
+
+ dirent_ensure_type(d, de);
+
+ if (!dirent_is_file(de))
+ continue;
+
+ k = safe_atou(de->d_name, &index);
+ if (k < 0)
+ continue;
+
+ if (indices) {
+ if ((unsigned) r >= n) {
+ unsigned *t;
+
+ n = MAX(16, 2*r);
+ t = realloc(l, sizeof(unsigned) * n);
+ if (!t)
+ return -ENOMEM;
+
+ l = t;
+ }
+
+ assert((unsigned) r < n);
+ l[r++] = index;
+ } else
+ r++;
+ }
+
+ if (indices) {
+ *indices = l;
+ l = NULL;
+ }
+
+ return r;
+}
+
+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(const char *category, sd_network_monitor **m) {
+ 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, "netif")) {
+ k = inotify_add_watch(fd, "/run/systemd/network/links/", IN_MOVED_TO|IN_DELETE);
+ if (k < 0) {
+ close_nointr_nofail(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;
+}