Adding upstream version 256.upstream/256

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 314 insertions, 0 deletions

diff --git a/src/network/networkd-manager-varlink.c b/src/network/networkd-manager-varlink.c
new file mode 100644
index 0000000..5eeed95
--- /dev/null
+++ b/src/network/networkd-manager-varlink.c
@@ -0,0 +1,314 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "bus-polkit.h"
+#include "fd-util.h"
+#include "lldp-rx-internal.h"
+#include "networkd-dhcp-server.h"
+#include "networkd-manager-varlink.h"
+#include "stat-util.h"
+#include "varlink.h"
+#include "varlink-io.systemd.Network.h"
+
+static int vl_method_get_states(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        Manager *m = ASSERT_PTR(userdata);
+
+        assert(link);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        return varlink_replyb(link,
+                              JSON_BUILD_OBJECT(
+                                              JSON_BUILD_PAIR_STRING("AddressState", link_address_state_to_string(m->address_state)),
+                                              JSON_BUILD_PAIR_STRING("IPv4AddressState", link_address_state_to_string(m->ipv4_address_state)),
+                                              JSON_BUILD_PAIR_STRING("IPv6AddressState", link_address_state_to_string(m->ipv6_address_state)),
+                                              JSON_BUILD_PAIR_STRING("CarrierState", link_carrier_state_to_string(m->carrier_state)),
+                                              JSON_BUILD_PAIR_CONDITION(m->online_state >= 0, "OnlineState", JSON_BUILD_STRING(link_online_state_to_string(m->online_state))),
+                                              JSON_BUILD_PAIR_STRING("OperationalState", link_operstate_to_string(m->operational_state))));
+}
+
+static int vl_method_get_namespace_id(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        uint64_t inode = 0;
+        uint32_t nsid = UINT32_MAX;
+        int r;
+
+        assert(link);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        /* Network namespaces have two identifiers: the inode number (which all namespace types have), and
+         * the "nsid" (aka the "cookie"), which only network namespaces know as a concept, and which is not
+         * assigned by default, but once it is, is fixed. Let's return both, to avoid any confusion which one
+         * this is. */
+
+        struct stat st;
+        if (stat("/proc/self/ns/net", &st) < 0)
+                log_warning_errno(errno, "Failed to stat network namespace, ignoring: %m");
+        else
+                inode = st.st_ino;
+
+        r = netns_get_nsid(/* netnsfd= */ -EBADF, &nsid);
+        if (r < 0)
+                log_full_errno(r == -ENODATA ? LOG_DEBUG : LOG_WARNING, r, "Failed to query network nsid, ignoring: %m");
+
+        return varlink_replyb(link,
+                              JSON_BUILD_OBJECT(
+                                              JSON_BUILD_PAIR_UNSIGNED("NamespaceId", inode),
+                                              JSON_BUILD_PAIR_CONDITION(nsid == UINT32_MAX, "NamespaceNSID", JSON_BUILD_NULL),
+                                              JSON_BUILD_PAIR_CONDITION(nsid != UINT32_MAX, "NamespaceNSID", JSON_BUILD_UNSIGNED(nsid))));
+}
+
+typedef struct InterfaceInfo {
+        int ifindex;
+        const char *ifname;
+} InterfaceInfo;
+
+static int dispatch_interface(Varlink *vlink, JsonVariant *parameters, Manager *manager, Link **ret) {
+        static const JsonDispatch dispatch_table[] = {
+                { "InterfaceIndex", _JSON_VARIANT_TYPE_INVALID, json_dispatch_int,          offsetof(InterfaceInfo, ifindex), 0 },
+                { "InterfaceName",  JSON_VARIANT_STRING,        json_dispatch_const_string, offsetof(InterfaceInfo, ifname),  0 },
+                {}
+        };
+
+        InterfaceInfo info = {};
+        Link *link = NULL;
+        int r;
+
+        assert(vlink);
+        assert(manager);
+
+        r = varlink_dispatch(vlink, parameters, dispatch_table, &info);
+        if (r != 0)
+                return r;
+
+        if (info.ifindex < 0)
+                return varlink_error_invalid_parameter(vlink, JSON_VARIANT_STRING_CONST("InterfaceIndex"));
+        if (info.ifindex > 0 && link_get_by_index(manager, info.ifindex, &link) < 0)
+                return varlink_error_invalid_parameter(vlink, JSON_VARIANT_STRING_CONST("InterfaceIndex"));
+        if (info.ifname) {
+                Link *link_by_name;
+
+                if (link_get_by_name(manager, info.ifname, &link_by_name) < 0)
+                        return varlink_error_invalid_parameter(vlink, JSON_VARIANT_STRING_CONST("InterfaceName"));
+
+                if (link && link_by_name != link)
+                        /* If both arguments are specified, then these must be consistent. */
+                        return varlink_error_invalid_parameter(vlink, JSON_VARIANT_STRING_CONST("InterfaceName"));
+
+                link = link_by_name;
+        }
+
+        /* If neither InterfaceIndex nor InterfaceName specified, this function returns NULL. */
+        *ret = link;
+        return 0;
+}
+
+static int link_append_lldp_neighbors(Link *link, JsonVariant *v, JsonVariant **array) {
+        assert(link);
+        assert(array);
+
+        return json_variant_append_arrayb(array,
+                        JSON_BUILD_OBJECT(
+                                JSON_BUILD_PAIR_INTEGER("InterfaceIndex", link->ifindex),
+                                JSON_BUILD_PAIR_STRING("InterfaceName", link->ifname),
+                                JSON_BUILD_PAIR_STRV_NON_EMPTY("InterfaceAlternativeNames", link->alternative_names),
+                                JSON_BUILD_PAIR_CONDITION(json_variant_is_blank_array(v), "Neighbors", JSON_BUILD_EMPTY_ARRAY),
+                                JSON_BUILD_PAIR_CONDITION(!json_variant_is_blank_array(v), "Neighbors", JSON_BUILD_VARIANT(v))));
+}
+
+static int vl_method_get_lldp_neighbors(Varlink *vlink, JsonVariant *parameters, VarlinkMethodFlags flags, Manager *manager) {
+        _cleanup_(json_variant_unrefp) JsonVariant *array = NULL;
+        Link *link = NULL;
+        int r;
+
+        assert(vlink);
+        assert(manager);
+
+        r = dispatch_interface(vlink, parameters, manager, &link);
+        if (r != 0)
+                return r;
+
+        if (link) {
+                _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+
+                if (link->lldp_rx) {
+                        r = lldp_rx_build_neighbors_json(link->lldp_rx, &v);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = link_append_lldp_neighbors(link, v, &array);
+                if (r < 0)
+                        return r;
+        } else
+                HASHMAP_FOREACH(link, manager->links_by_index) {
+                        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+
+                        if (!link->lldp_rx)
+                                continue;
+
+                        r = lldp_rx_build_neighbors_json(link->lldp_rx, &v);
+                        if (r < 0)
+                                return r;
+
+                        if (json_variant_is_blank_array(v))
+                                continue;
+
+                        r = link_append_lldp_neighbors(link, v, &array);
+                        if (r < 0)
+                                return r;
+                }
+
+        return varlink_replyb(vlink,
+                        JSON_BUILD_OBJECT(
+                                JSON_BUILD_PAIR_CONDITION(json_variant_is_blank_array(array), "Neighbors", JSON_BUILD_EMPTY_ARRAY),
+                                JSON_BUILD_PAIR_CONDITION(!json_variant_is_blank_array(array), "Neighbors", JSON_BUILD_VARIANT(array))));
+}
+
+static int vl_method_set_persistent_storage(Varlink *vlink, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        static const JsonDispatch dispatch_table[] = {
+                { "Ready", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, 0, 0 },
+                {}
+        };
+
+        Manager *manager = ASSERT_PTR(userdata);
+        bool ready;
+        int r;
+
+        assert(vlink);
+
+        r = varlink_dispatch(vlink, parameters, dispatch_table, &ready);
+        if (r != 0)
+                return r;
+
+        if (ready) {
+                struct stat st, st_prev;
+                int fd;
+
+                fd = varlink_peek_fd(vlink, 0);
+                if (fd < 0)
+                        return log_warning_errno(fd, "Failed to peek file descriptor of the persistent storage: %m");
+
+                r = fd_verify_safe_flags_full(fd, O_DIRECTORY);
+                if (r == -EREMOTEIO)
+                        return log_warning_errno(r, "Passed persistent storage fd has unexpected flags, refusing.");
+                if (r < 0)
+                        return log_warning_errno(r, "Failed to verify flags of passed persistent storage fd: %m");
+
+                r = fd_is_read_only_fs(fd);
+                if (r < 0)
+                        return log_warning_errno(r, "Failed to check if the persistent storage is writable: %m");
+                if (r > 0) {
+                        log_warning("The persistent storage is on read-only filesystem.");
+                        return varlink_error(vlink, "io.systemd.Network.StorageReadOnly", NULL);
+                }
+
+                if (fstat(fd, &st) < 0)
+                        return log_warning_errno(errno, "Failed to stat the passed persistent storage fd: %m");
+
+                r = stat_verify_directory(&st);
+                if (r < 0)
+                        return log_warning_errno(r, "The passed persistent storage fd is not a directory, refusing: %m");
+
+                if (manager->persistent_storage_fd >= 0 &&
+                    fstat(manager->persistent_storage_fd, &st_prev) >= 0 &&
+                    stat_inode_same(&st, &st_prev))
+                        return varlink_reply(vlink, NULL);
+
+        } else {
+                if (manager->persistent_storage_fd < 0)
+                        return varlink_reply(vlink, NULL);
+        }
+
+        r = varlink_verify_polkit_async(
+                                vlink,
+                                manager->bus,
+                                "org.freedesktop.network1.set-persistent-storage",
+                                /* details= */ NULL,
+                                &manager->polkit_registry);
+        if (r <= 0)
+                return r;
+
+        if (ready) {
+                _cleanup_close_ int fd = -EBADF;
+
+                fd = varlink_take_fd(vlink, 0);
+                if (fd < 0)
+                        return log_warning_errno(fd, "Failed to take file descriptor of the persistent storage: %m");
+
+                close_and_replace(manager->persistent_storage_fd, fd);
+        } else
+                manager->persistent_storage_fd = safe_close(manager->persistent_storage_fd);
+
+        manager_toggle_dhcp4_server_state(manager, ready);
+
+        return varlink_reply(vlink, NULL);
+}
+
+static int on_connect(VarlinkServer *s, Varlink *vlink, void *userdata) {
+        int r;
+
+        assert(vlink);
+
+        r = varlink_set_allow_fd_passing_input(vlink, true);
+        if (r < 0)
+                return log_warning_errno(r, "Failed to allow receiving file descriptor through varlink: %m");
+
+        return 0;
+}
+
+int manager_connect_varlink(Manager *m) {
+        _cleanup_(varlink_server_unrefp) VarlinkServer *s = NULL;
+        int r;
+
+        assert(m);
+
+        if (m->varlink_server)
+                return 0;
+
+        r = varlink_server_new(&s, VARLINK_SERVER_ACCOUNT_UID|VARLINK_SERVER_INHERIT_USERDATA);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate varlink server object: %m");
+
+        varlink_server_set_userdata(s, m);
+
+        (void) varlink_server_set_description(s, "varlink-api-network");
+
+        r = varlink_server_add_interface(s, &vl_interface_io_systemd_Network);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add Network interface to varlink server: %m");
+
+        r = varlink_server_bind_method_many(
+                        s,
+                        "io.systemd.Network.GetStates", vl_method_get_states,
+                        "io.systemd.Network.GetNamespaceId", vl_method_get_namespace_id,
+                        "io.systemd.Network.GetLLDPNeighbors", vl_method_get_lldp_neighbors,
+                        "io.systemd.Network.SetPersistentStorage", vl_method_set_persistent_storage);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register varlink methods: %m");
+
+        r = varlink_server_listen_address(s, "/run/systemd/netif/io.systemd.Network", 0666);
+        if (r < 0)
+                return log_error_errno(r, "Failed to bind to varlink socket: %m");
+
+        r = varlink_server_attach_event(s, m->event, SD_EVENT_PRIORITY_NORMAL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to attach varlink connection to event loop: %m");
+
+        r = varlink_server_bind_connect(s, on_connect);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set on-connect callback for varlink: %m");
+
+        m->varlink_server = TAKE_PTR(s);
+        return 0;
+}
+
+void manager_varlink_done(Manager *m) {
+        assert(m);
+
+        m->varlink_server = varlink_server_unref(m->varlink_server);
+        (void) unlink("/run/systemd/netif/io.systemd.Network");
+}