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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dhcp-server-lease-internal.h"
static sd_dhcp_server_lease* dhcp_server_lease_free(sd_dhcp_server_lease *lease) {
if (!lease)
return NULL;
if (lease->server) {
hashmap_remove_value(lease->server->bound_leases_by_address, UINT32_TO_PTR(lease->address), lease);
hashmap_remove_value(lease->server->bound_leases_by_client_id, &lease->client_id, lease);
hashmap_remove_value(lease->server->static_leases_by_address, UINT32_TO_PTR(lease->address), lease);
hashmap_remove_value(lease->server->static_leases_by_client_id, &lease->client_id, lease);
}
free(lease->hostname);
return mfree(lease);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server_lease, sd_dhcp_server_lease, dhcp_server_lease_free);
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
dhcp_server_lease_hash_ops,
sd_dhcp_client_id,
client_id_hash_func,
client_id_compare_func,
sd_dhcp_server_lease,
sd_dhcp_server_lease_unref);
int dhcp_server_put_lease(sd_dhcp_server *server, sd_dhcp_server_lease *lease, bool is_static) {
int r;
assert(server);
assert(lease);
lease->server = server; /* This must be set before hashmap_put(). */
r = hashmap_ensure_put(is_static ? &server->static_leases_by_client_id : &server->bound_leases_by_client_id,
&dhcp_server_lease_hash_ops, &lease->client_id, lease);
if (r < 0)
return r;
r = hashmap_ensure_put(is_static ? &server->static_leases_by_address : &server->bound_leases_by_address,
NULL, UINT32_TO_PTR(lease->address), lease);
if (r < 0)
return r;
return 0;
}
int dhcp_server_set_lease(sd_dhcp_server *server, be32_t address, DHCPRequest *req, usec_t expiration) {
_cleanup_(sd_dhcp_server_lease_unrefp) sd_dhcp_server_lease *lease = NULL;
int r;
assert(server);
assert(address != 0);
assert(req);
assert(expiration != 0);
/* If a lease for the host already exists, update it. */
lease = hashmap_get(server->bound_leases_by_client_id, &req->client_id);
if (lease) {
if (lease->address != address) {
hashmap_remove_value(server->bound_leases_by_address, UINT32_TO_PTR(lease->address), lease);
lease->address = address;
r = hashmap_ensure_put(&server->bound_leases_by_address, NULL, UINT32_TO_PTR(lease->address), lease);
if (r < 0)
return r;
}
lease->expiration = expiration;
TAKE_PTR(lease);
return 0;
}
/* Otherwise, add a new lease. */
lease = new(sd_dhcp_server_lease, 1);
if (!lease)
return -ENOMEM;
*lease = (sd_dhcp_server_lease) {
.n_ref = 1,
.address = address,
.client_id = req->client_id,
.htype = req->message->htype,
.hlen = req->message->hlen,
.gateway = req->message->giaddr,
.expiration = expiration,
};
memcpy(lease->chaddr, req->message->chaddr, req->message->hlen);
if (req->hostname) {
lease->hostname = strdup(req->hostname);
if (!lease->hostname)
return -ENOMEM;
}
r = dhcp_server_put_lease(server, lease, /* is_static = */ false);
if (r < 0)
return r;
TAKE_PTR(lease);
return 0;
}
int dhcp_server_cleanup_expired_leases(sd_dhcp_server *server) {
sd_dhcp_server_lease *lease;
usec_t time_now;
int r;
assert(server);
r = sd_event_now(server->event, CLOCK_BOOTTIME, &time_now);
if (r < 0)
return r;
HASHMAP_FOREACH(lease, server->bound_leases_by_client_id)
if (lease->expiration < time_now) {
log_dhcp_server(server, "CLEAN (0x%x)", be32toh(lease->address));
sd_dhcp_server_lease_unref(lease);
}
return 0;
}
sd_dhcp_server_lease* dhcp_server_get_static_lease(sd_dhcp_server *server, const DHCPRequest *req) {
sd_dhcp_server_lease *static_lease;
sd_dhcp_client_id client_id;
assert(server);
assert(req);
static_lease = hashmap_get(server->static_leases_by_client_id, &req->client_id);
if (static_lease)
goto verify;
/* when no lease is found based on the client id fall back to chaddr */
if (!client_id_data_size_is_valid(req->message->hlen))
return NULL;
if (sd_dhcp_client_id_set(&client_id, /* type = */ 1, req->message->chaddr, req->message->hlen) < 0)
return NULL;
static_lease = hashmap_get(server->static_leases_by_client_id, &client_id);
if (!static_lease)
return NULL;
verify:
/* Check if the address is in the same subnet. */
if ((static_lease->address & server->netmask) != server->subnet)
return NULL;
/* Check if the address is different from the server address. */
if (static_lease->address == server->address)
return NULL;
return static_lease;
}
int sd_dhcp_server_set_static_lease(
sd_dhcp_server *server,
const struct in_addr *address,
uint8_t *client_id_raw,
size_t client_id_size) {
_cleanup_(sd_dhcp_server_lease_unrefp) sd_dhcp_server_lease *lease = NULL;
sd_dhcp_client_id client_id;
int r;
assert_return(server, -EINVAL);
assert_return(client_id_raw, -EINVAL);
assert_return(client_id_size_is_valid(client_id_size), -EINVAL);
assert_return(!sd_dhcp_server_is_running(server), -EBUSY);
r = sd_dhcp_client_id_set_raw(&client_id, client_id_raw, client_id_size);
if (r < 0)
return r;
/* Static lease with an empty or omitted address is a valid entry,
* the server removes any static lease with the specified mac address. */
if (!address || address->s_addr == 0) {
sd_dhcp_server_lease_unref(hashmap_get(server->static_leases_by_client_id, &client_id));
return 0;
}
lease = new(sd_dhcp_server_lease, 1);
if (!lease)
return -ENOMEM;
*lease = (sd_dhcp_server_lease) {
.n_ref = 1,
.address = address->s_addr,
.client_id = client_id,
};
r = dhcp_server_put_lease(server, lease, /* is_static = */ true);
if (r < 0)
return r;
TAKE_PTR(lease);
return 0;
}
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