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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Intel Corporation. All rights reserved.
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 <errno.h>
#include <string.h>
#include "siphash24.h"
#include "util.h"
#include "refcnt.h"
#include "sd-dhcp6-client.h"
#include "dhcp6-protocol.h"
#define SYSTEMD_PEN 43793
#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
struct sd_dhcp6_client {
RefCount n_ref;
enum DHCP6State state;
sd_event *event;
int event_priority;
int index;
struct ether_addr mac_addr;
sd_dhcp6_client_cb_t cb;
void *userdata;
struct duid_en {
uint16_t type; /* DHCP6_DUID_EN */
uint32_t pen;
uint8_t id[8];
} _packed_ duid;
};
int sd_dhcp6_client_set_callback(sd_dhcp6_client *client,
sd_dhcp6_client_cb_t cb, void *userdata)
{
assert_return(client, -EINVAL);
client->cb = cb;
client->userdata = userdata;
return 0;
}
int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index)
{
assert_return(client, -EINVAL);
assert_return(interface_index >= -1, -EINVAL);
client->index = interface_index;
return 0;
}
int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
const struct ether_addr *mac_addr)
{
assert_return(client, -EINVAL);
if (mac_addr)
memcpy(&client->mac_addr, mac_addr, sizeof(client->mac_addr));
else
memset(&client->mac_addr, 0x00, sizeof(client->mac_addr));
return 0;
}
static sd_dhcp6_client *client_notify(sd_dhcp6_client *client, int event) {
if (client->cb) {
client = sd_dhcp6_client_ref(client);
client->cb(client, event, client->userdata);
client = sd_dhcp6_client_unref(client);
}
return client;
}
static int client_initialize(sd_dhcp6_client *client)
{
assert_return(client, -EINVAL);
client->state = DHCP6_STATE_STOPPED;
return 0;
}
static sd_dhcp6_client *client_stop(sd_dhcp6_client *client, int error) {
assert_return(client, NULL);
client = client_notify(client, error);
if (client)
client_initialize(client);
return client;
}
int sd_dhcp6_client_stop(sd_dhcp6_client *client)
{
client_stop(client, DHCP6_EVENT_STOP);
return 0;
}
int sd_dhcp6_client_start(sd_dhcp6_client *client)
{
int r = 0;
assert_return(client, -EINVAL);
assert_return(client->event, -EINVAL);
assert_return(client->index > 0, -EINVAL);
return r;
}
int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event,
int priority)
{
int r;
assert_return(client, -EINVAL);
assert_return(!client->event, -EBUSY);
if (event)
client->event = sd_event_ref(event);
else {
r = sd_event_default(&client->event);
if (r < 0)
return 0;
}
client->event_priority = priority;
return 0;
}
int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) {
assert_return(client, -EINVAL);
client->event = sd_event_unref(client->event);
return 0;
}
sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) {
if (!client)
return NULL;
return client->event;
}
sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) {
if (client)
assert_se(REFCNT_INC(client->n_ref) >= 2);
return client;
}
sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) {
if (client && REFCNT_DEC(client->n_ref) <= 0) {
client_initialize(client);
sd_dhcp6_client_detach_event(client);
free(client);
return NULL;
}
return client;
}
DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_client*, sd_dhcp6_client_unref);
#define _cleanup_dhcp6_client_free_ _cleanup_(sd_dhcp6_client_unrefp)
int sd_dhcp6_client_new(sd_dhcp6_client **ret)
{
_cleanup_dhcp6_client_free_ sd_dhcp6_client *client = NULL;
sd_id128_t machine_id;
int r;
assert_return(ret, -EINVAL);
client = new0(sd_dhcp6_client, 1);
if (!client)
return -ENOMEM;
client->n_ref = REFCNT_INIT;
client->index = -1;
/* initialize DUID */
client->duid.type = htobe16(DHCP6_DUID_EN);
client->duid.pen = htobe32(SYSTEMD_PEN);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
/* a bit of snake-oil perhaps, but no need to expose the machine-id
directly */
siphash24(client->duid.id, &machine_id, sizeof(machine_id),
HASH_KEY.bytes);
*ret = client;
client = NULL;
return 0;
}
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