sd-network: move sd-network API into libsystemd proper

In contrast to the DHCP/IPv4LL/ICMP6 APIs sd-network is not a protocol
implementation but a client API for networkd, hence move it into
libsystemd proper.

1 files changed, 257 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 0000000000..6375788c95
--- /dev/null
+++ b/src/libsystemd/sd-network/sd-network.c
@@ -0,0 +1,257 @@
+/*-*- 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_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;
+        else if (r < 0)
+                return r;
+        else if (!s)
+                return -EIO;
+
+        if (streq(s, "initializing"))
+                return -EBUSY;
+
+        *state = s;
+        s = NULL;
+
+        return 0;
+}
+
+_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;
+        else if (r < 0)
+                return r;
+        else if (!s)
+                return -EIO;
+
+        *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;
+        else if (r < 0)
+                return r;
+        else if (!s)
+                return -EIO;
+
+        *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;
+        else if (r < 0)
+                return r;
+        else if (!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 < 0)
+                return r;
+        else if (!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;
+}