networkd: start a DBus interface for the DHCP server

Add a "org.freedesktop.network1.DHCPServer" DBus interface that will be
added on a link path where a DHCP server is provided.

Currently, it only exposes a "Leases" property, although there are plans
to expand it further. The property is updated thanks to the
dhcp_server_callback().
This commit is contained in:
Marc-André Lureau 2020-05-22 11:49:16 +02:00
parent 36d35f2259
commit 38ee31a6e4
3 changed files with 122 additions and 0 deletions

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@ -61,6 +61,8 @@ sources = files('''
networkd-conf.h
networkd-dhcp-common.c
networkd-dhcp-common.h
networkd-dhcp-server-bus.c
networkd-dhcp-server-bus.h
networkd-dhcp-server.c
networkd-dhcp-server.h
networkd-dhcp4.c

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@ -0,0 +1,111 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#include "sd-dhcp-server.h"
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-util.h"
#include "dhcp-server-internal.h"
#include "networkd-dhcp-server-bus.h"
#include "networkd-link-bus.h"
#include "networkd-manager.h"
#include "strv.h"
static int property_get_leases(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
Link *l = userdata;
sd_dhcp_server *s;
DHCPLease *lease;
Iterator i;
int r;
assert(reply);
assert(l);
s = l->dhcp_server;
if (!s)
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Link %s has no DHCP server.", l->ifname);
r = sd_bus_message_open_container(reply, 'a', "(uayayayayt)");
if (r < 0)
return r;
HASHMAP_FOREACH(lease, s->leases_by_client_id, i) {
r = sd_bus_message_open_container(reply, 'r', "uayayayayt");
if (r < 0)
return r;
r = sd_bus_message_append(reply, "u", (uint32_t)AF_INET);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', lease->client_id.data, lease->client_id.length);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &lease->address, sizeof(lease->address));
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &lease->gateway, sizeof(lease->gateway));
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &lease->chaddr, sizeof(lease->chaddr));
if (r < 0)
return r;
r = sd_bus_message_append_basic(reply, 't', &lease->expiration);
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int dhcp_server_emit_changed(Link *link, const char *property, ...) {
_cleanup_free_ char *path = NULL;
char **l;
assert(link);
path = link_bus_path(link);
if (!path)
return log_oom();
l = strv_from_stdarg_alloca(property);
return sd_bus_emit_properties_changed_strv(
link->manager->bus,
path,
"org.freedesktop.network1.DHCPServer",
l);
}
void dhcp_server_callback(sd_dhcp_server *s, uint64_t event, void *data) {
Link *l = data;
assert(l);
if (event & SD_DHCP_SERVER_EVENT_LEASE_CHANGED)
(void) dhcp_server_emit_changed(l, "Leases", NULL);
}
const sd_bus_vtable dhcp_server_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Leases", "a(uayayayayt)", property_get_leases, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_VTABLE_END
};

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@ -0,0 +1,9 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include "sd-bus.h"
#include "networkd-link.h"
extern const sd_bus_vtable dhcp_server_vtable[];
void dhcp_server_callback(sd_dhcp_server *server, uint64_t event, void *data);