1396 lines
46 KiB
C
1396 lines
46 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include <netinet/ether.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include "util.h"
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#include "list.h"
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#include "refcnt.h"
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#include "async.h"
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#include "dhcp-protocol.h"
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#include "dhcp-internal.h"
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#include "dhcp-lease-internal.h"
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#include "sd-dhcp-client.h"
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struct sd_dhcp_client {
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RefCount n_ref;
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DHCPState state;
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sd_event *event;
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int event_priority;
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sd_event_source *timeout_resend;
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int index;
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int fd;
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union sockaddr_union link;
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sd_event_source *receive_message;
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uint8_t *req_opts;
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size_t req_opts_allocated;
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size_t req_opts_size;
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be32_t last_addr;
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struct {
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uint8_t type;
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struct ether_addr mac_addr;
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} _packed_ client_id;
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uint32_t xid;
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usec_t start_time;
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uint16_t secs;
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unsigned int attempt;
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usec_t request_sent;
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sd_event_source *timeout_t1;
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sd_event_source *timeout_t2;
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sd_event_source *timeout_expire;
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sd_dhcp_client_cb_t cb;
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void *userdata;
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sd_dhcp_lease *lease;
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};
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static const uint8_t default_req_opts[] = {
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DHCP_OPTION_SUBNET_MASK,
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DHCP_OPTION_ROUTER,
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DHCP_OPTION_HOST_NAME,
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DHCP_OPTION_DOMAIN_NAME,
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DHCP_OPTION_DOMAIN_NAME_SERVER,
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DHCP_OPTION_NTP_SERVER,
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};
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static int client_receive_message_raw(sd_event_source *s, int fd,
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uint32_t revents, void *userdata);
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static int client_receive_message_udp(sd_event_source *s, int fd,
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uint32_t revents, void *userdata);
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static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error);
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int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
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void *userdata) {
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assert_return(client, -EINVAL);
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client->cb = cb;
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client->userdata = userdata;
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return 0;
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}
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int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
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size_t i;
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assert_return(client, -EINVAL);
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assert_return (IN_SET(client->state, DHCP_STATE_INIT,
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DHCP_STATE_STOPPED), -EBUSY);
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switch(option) {
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case DHCP_OPTION_PAD:
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case DHCP_OPTION_OVERLOAD:
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case DHCP_OPTION_MESSAGE_TYPE:
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case DHCP_OPTION_PARAMETER_REQUEST_LIST:
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case DHCP_OPTION_END:
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return -EINVAL;
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default:
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break;
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}
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for (i = 0; i < client->req_opts_size; i++)
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if (client->req_opts[i] == option)
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return -EEXIST;
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if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
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client->req_opts_size + 1))
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return -ENOMEM;
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client->req_opts[client->req_opts_size++] = option;
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return 0;
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}
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int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
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const struct in_addr *last_addr) {
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assert_return(client, -EINVAL);
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assert_return (IN_SET(client->state, DHCP_STATE_INIT,
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DHCP_STATE_STOPPED), -EBUSY);
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if (last_addr)
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client->last_addr = last_addr->s_addr;
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else
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client->last_addr = INADDR_ANY;
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return 0;
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}
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int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
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assert_return(client, -EINVAL);
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assert_return (IN_SET(client->state, DHCP_STATE_INIT,
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DHCP_STATE_STOPPED), -EBUSY);
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assert_return(interface_index > 0, -EINVAL);
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client->index = interface_index;
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return 0;
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}
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int sd_dhcp_client_set_mac(sd_dhcp_client *client,
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const struct ether_addr *addr) {
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bool need_restart = false;
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assert_return(client, -EINVAL);
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assert_return(addr, -EINVAL);
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if (memcmp(&client->client_id.mac_addr, addr, ETH_ALEN) == 0)
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return 0;
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if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
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log_dhcp_client(client, "Changing MAC address on running DHCP "
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"client, restarting");
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need_restart = true;
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client = client_stop(client, DHCP_EVENT_STOP);
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}
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if (!client)
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return 0;
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memcpy(&client->client_id.mac_addr, addr, ETH_ALEN);
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client->client_id.type = 0x01;
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if (need_restart && client->state != DHCP_STATE_STOPPED)
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sd_dhcp_client_start(client);
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return 0;
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}
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int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
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assert_return(client, -EINVAL);
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assert_return(ret, -EINVAL);
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if (client->state != DHCP_STATE_BOUND &&
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client->state != DHCP_STATE_RENEWING &&
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client->state != DHCP_STATE_REBINDING)
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return -EADDRNOTAVAIL;
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*ret = sd_dhcp_lease_ref(client->lease);
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return 0;
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}
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static sd_dhcp_client *client_notify(sd_dhcp_client *client, int event) {
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if (client->cb) {
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client = sd_dhcp_client_ref(client);
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client->cb(client, event, client->userdata);
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client = sd_dhcp_client_unref(client);
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}
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return client;
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}
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static int client_initialize(sd_dhcp_client *client) {
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assert_return(client, -EINVAL);
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client->receive_message =
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sd_event_source_unref(client->receive_message);
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client->fd = asynchronous_close(client->fd);
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client->timeout_resend = sd_event_source_unref(client->timeout_resend);
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client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
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client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
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client->timeout_expire = sd_event_source_unref(client->timeout_expire);
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client->attempt = 1;
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client->state = DHCP_STATE_INIT;
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client->xid = 0;
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if (client->lease)
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client->lease = sd_dhcp_lease_unref(client->lease);
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return 0;
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}
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static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error) {
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assert_return(client, NULL);
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if (error < 0)
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log_dhcp_client(client, "STOPPED: %s", strerror(-error));
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else {
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switch(error) {
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case DHCP_EVENT_STOP:
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log_dhcp_client(client, "STOPPED");
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break;
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case DHCP_EVENT_NO_LEASE:
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log_dhcp_client(client, "STOPPED: No lease");
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break;
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default:
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log_dhcp_client(client, "STOPPED: Unknown reason");
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break;
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}
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}
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client = client_notify(client, error);
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if (client)
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client_initialize(client);
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return client;
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}
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static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret,
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uint8_t type, size_t *_optlen, size_t *_optoffset) {
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_cleanup_free_ DHCPPacket *packet;
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size_t optlen, optoffset, size;
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be16_t max_size;
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int r;
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assert(client);
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assert(client->secs);
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assert(ret);
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assert(_optlen);
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assert(_optoffset);
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assert(type == DHCP_DISCOVER || type == DHCP_REQUEST);
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optlen = DHCP_MIN_OPTIONS_SIZE;
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size = sizeof(DHCPPacket) + optlen;
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packet = malloc0(size);
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if (!packet)
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return -ENOMEM;
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r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
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optlen, &optoffset);
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if (r < 0)
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return r;
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/* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
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refuse to issue an DHCP lease if 'secs' is set to zero */
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packet->dhcp.secs = htobe16(client->secs);
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/* RFC2132 section 4.1.1:
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The client MUST include its hardware address in the ’chaddr’ field, if
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necessary for delivery of DHCP reply messages.
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*/
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memcpy(&packet->dhcp.chaddr, &client->client_id.mac_addr, ETH_ALEN);
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/* Some DHCP servers will refuse to issue an DHCP lease if the Client
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Identifier option is not set */
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r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_CLIENT_IDENTIFIER,
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sizeof(client->client_id), &client->client_id);
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if (r < 0)
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return r;
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/* RFC2131 section 3.5:
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in its initial DHCPDISCOVER or DHCPREQUEST message, a
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client may provide the server with a list of specific
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parameters the client is interested in. If the client
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includes a list of parameters in a DHCPDISCOVER message,
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it MUST include that list in any subsequent DHCPREQUEST
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messages.
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*/
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r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_PARAMETER_REQUEST_LIST,
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client->req_opts_size, client->req_opts);
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if (r < 0)
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return r;
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/* RFC2131 section 3.5:
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The client SHOULD include the ’maximum DHCP message size’ option to
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let the server know how large the server may make its DHCP messages.
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Note (from ConnMan): Some DHCP servers will send bigger DHCP packets
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than the defined default size unless the Maximum Messge Size option
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is explicitely set
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*/
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max_size = htobe16(size);
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r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
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2, &max_size);
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if (r < 0)
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return r;
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*_optlen = optlen;
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*_optoffset = optoffset;
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*ret = packet;
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packet = NULL;
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return 0;
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}
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static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
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size_t len) {
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dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
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INADDR_BROADCAST, DHCP_PORT_SERVER, len);
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|
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return dhcp_network_send_raw_socket(client->fd, &client->link,
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packet, len);
|
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}
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|
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static int client_send_discover(sd_dhcp_client *client) {
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_cleanup_free_ DHCPPacket *discover = NULL;
|
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size_t optoffset, optlen;
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usec_t time_now;
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int r;
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assert(client);
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assert(client->state == DHCP_STATE_INIT ||
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client->state == DHCP_STATE_SELECTING);
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/* See RFC2131 section 4.4.1 */
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r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
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if (r < 0)
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return r;
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assert(time_now >= client->start_time);
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|
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/* seconds between sending first and last DISCOVER
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* must always be strictly positive to deal with broken servers */
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client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
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r = client_message_init(client, &discover, DHCP_DISCOVER,
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&optlen, &optoffset);
|
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if (r < 0)
|
||
return r;
|
||
|
||
/* the client may suggest values for the network address
|
||
and lease time in the DHCPDISCOVER message. The client may include
|
||
the ’requested IP address’ option to suggest that a particular IP
|
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address be assigned, and may include the ’IP address lease time’
|
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option to suggest the lease time it would like.
|
||
*/
|
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if (client->last_addr != INADDR_ANY) {
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r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_REQUESTED_IP_ADDRESS,
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4, &client->last_addr);
|
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if (r < 0)
|
||
return r;
|
||
}
|
||
|
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r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_END, 0, NULL);
|
||
|
||
/* We currently ignore:
|
||
The client SHOULD wait a random time between one and ten seconds to
|
||
desynchronize the use of DHCP at startup.
|
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*/
|
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r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset);
|
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if (r < 0)
|
||
return r;
|
||
|
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log_dhcp_client(client, "DISCOVER");
|
||
|
||
return 0;
|
||
}
|
||
|
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static int client_send_request(sd_dhcp_client *client) {
|
||
_cleanup_free_ DHCPPacket *request;
|
||
size_t optoffset, optlen;
|
||
int r;
|
||
|
||
r = client_message_init(client, &request, DHCP_REQUEST,
|
||
&optlen, &optoffset);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
switch (client->state) {
|
||
/* See RFC2131 section 4.3.2 (note that there is a typo in the RFC,
|
||
SELECTING should be REQUESTING)
|
||
*/
|
||
|
||
case DHCP_STATE_REQUESTING:
|
||
/* Client inserts the address of the selected server in ’server
|
||
identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be
|
||
filled in with the yiaddr value from the chosen DHCPOFFER.
|
||
*/
|
||
|
||
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
|
||
DHCP_OPTION_SERVER_IDENTIFIER,
|
||
4, &client->lease->server_address);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
|
||
DHCP_OPTION_REQUESTED_IP_ADDRESS,
|
||
4, &client->lease->address);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_INIT_REBOOT:
|
||
/* ’server identifier’ MUST NOT be filled in, ’requested IP address’
|
||
option MUST be filled in with client’s notion of its previously
|
||
assigned address. ’ciaddr’ MUST be zero.
|
||
*/
|
||
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
|
||
DHCP_OPTION_REQUESTED_IP_ADDRESS,
|
||
4, &client->last_addr);
|
||
if (r < 0)
|
||
return r;
|
||
break;
|
||
|
||
case DHCP_STATE_RENEWING:
|
||
/* ’server identifier’ MUST NOT be filled in, ’requested IP address’
|
||
option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
|
||
client’s IP address.
|
||
*/
|
||
|
||
/* fall through */
|
||
case DHCP_STATE_REBINDING:
|
||
/* ’server identifier’ MUST NOT be filled in, ’requested IP address’
|
||
option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
|
||
client’s IP address.
|
||
|
||
This message MUST be broadcast to the 0xffffffff IP broadcast address.
|
||
*/
|
||
request->dhcp.ciaddr = client->lease->address;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_INIT:
|
||
case DHCP_STATE_SELECTING:
|
||
case DHCP_STATE_REBOOTING:
|
||
case DHCP_STATE_BOUND:
|
||
case DHCP_STATE_STOPPED:
|
||
return -EINVAL;
|
||
}
|
||
|
||
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
|
||
DHCP_OPTION_END, 0, NULL);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (client->state == DHCP_STATE_RENEWING) {
|
||
r = dhcp_network_send_udp_socket(client->fd,
|
||
client->lease->server_address,
|
||
DHCP_PORT_SERVER,
|
||
&request->dhcp,
|
||
sizeof(DHCPMessage) + optoffset);
|
||
} else {
|
||
r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset);
|
||
}
|
||
if (r < 0)
|
||
return r;
|
||
|
||
switch (client->state) {
|
||
case DHCP_STATE_REQUESTING:
|
||
log_dhcp_client(client, "REQUEST (requesting)");
|
||
break;
|
||
case DHCP_STATE_INIT_REBOOT:
|
||
log_dhcp_client(client, "REQUEST (init-reboot)");
|
||
break;
|
||
case DHCP_STATE_RENEWING:
|
||
log_dhcp_client(client, "REQUEST (renewing)");
|
||
break;
|
||
case DHCP_STATE_REBINDING:
|
||
log_dhcp_client(client, "REQUEST (rebinding)");
|
||
break;
|
||
default:
|
||
log_dhcp_client(client, "REQUEST (invalid)");
|
||
break;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int client_start(sd_dhcp_client *client);
|
||
|
||
static int client_timeout_resend(sd_event_source *s, uint64_t usec,
|
||
void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
usec_t next_timeout = 0;
|
||
uint64_t time_now;
|
||
uint32_t time_left;
|
||
int r;
|
||
|
||
assert(s);
|
||
assert(client);
|
||
assert(client->event);
|
||
|
||
r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
switch (client->state) {
|
||
case DHCP_STATE_RENEWING:
|
||
|
||
time_left = (client->lease->t2 - client->lease->t1) / 2;
|
||
if (time_left < 60)
|
||
time_left = 60;
|
||
|
||
next_timeout = time_now + time_left * USEC_PER_SEC;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_REBINDING:
|
||
|
||
time_left = (client->lease->lifetime - client->lease->t2) / 2;
|
||
if (time_left < 60)
|
||
time_left = 60;
|
||
|
||
next_timeout = time_now + time_left * USEC_PER_SEC;
|
||
break;
|
||
|
||
case DHCP_STATE_REBOOTING:
|
||
/* start over as we did not receive a timely ack or nak */
|
||
r = client_initialize(client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = client_start(client);
|
||
if (r < 0)
|
||
goto error;
|
||
else {
|
||
log_dhcp_client(client, "REBOOTED");
|
||
return 0;
|
||
}
|
||
|
||
case DHCP_STATE_INIT:
|
||
case DHCP_STATE_INIT_REBOOT:
|
||
case DHCP_STATE_SELECTING:
|
||
case DHCP_STATE_REQUESTING:
|
||
case DHCP_STATE_BOUND:
|
||
|
||
if (client->attempt < 64)
|
||
client->attempt *= 2;
|
||
|
||
next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_STOPPED:
|
||
r = -EINVAL;
|
||
goto error;
|
||
}
|
||
|
||
next_timeout += (random_u32() & 0x1fffff);
|
||
|
||
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
|
||
|
||
r = sd_event_add_time(client->event,
|
||
&client->timeout_resend,
|
||
CLOCK_MONOTONIC,
|
||
next_timeout, 10 * USEC_PER_MSEC,
|
||
client_timeout_resend, client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_resend,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
switch (client->state) {
|
||
case DHCP_STATE_INIT:
|
||
r = client_send_discover(client);
|
||
if (r >= 0) {
|
||
client->state = DHCP_STATE_SELECTING;
|
||
client->attempt = 1;
|
||
} else {
|
||
if (client->attempt >= 64)
|
||
goto error;
|
||
}
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_SELECTING:
|
||
r = client_send_discover(client);
|
||
if (r < 0 && client->attempt >= 64)
|
||
goto error;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_INIT_REBOOT:
|
||
case DHCP_STATE_REQUESTING:
|
||
case DHCP_STATE_RENEWING:
|
||
case DHCP_STATE_REBINDING:
|
||
r = client_send_request(client);
|
||
if (r < 0 && client->attempt >= 64)
|
||
goto error;
|
||
|
||
if (client->state == DHCP_STATE_INIT_REBOOT)
|
||
client->state = DHCP_STATE_REBOOTING;
|
||
|
||
client->request_sent = time_now;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_REBOOTING:
|
||
case DHCP_STATE_BOUND:
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_STOPPED:
|
||
r = -EINVAL;
|
||
goto error;
|
||
}
|
||
|
||
return 0;
|
||
|
||
error:
|
||
client_stop(client, r);
|
||
|
||
/* Errors were dealt with when stopping the client, don't spill
|
||
errors into the event loop handler */
|
||
return 0;
|
||
}
|
||
|
||
static int client_initialize_events(sd_dhcp_client *client,
|
||
sd_event_io_handler_t io_callback) {
|
||
int r;
|
||
|
||
assert(client);
|
||
assert(client->event);
|
||
|
||
r = sd_event_add_io(client->event, &client->receive_message,
|
||
client->fd, EPOLLIN, io_callback,
|
||
client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = sd_event_source_set_priority(client->receive_message,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
|
||
|
||
r = sd_event_add_time(client->event,
|
||
&client->timeout_resend,
|
||
CLOCK_MONOTONIC,
|
||
0, 0,
|
||
client_timeout_resend, client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_resend,
|
||
client->event_priority);
|
||
|
||
error:
|
||
if (r < 0)
|
||
client_stop(client, r);
|
||
|
||
return 0;
|
||
|
||
}
|
||
|
||
static int client_start(sd_dhcp_client *client) {
|
||
int r;
|
||
|
||
assert_return(client, -EINVAL);
|
||
assert_return(client->event, -EINVAL);
|
||
assert_return(client->index > 0, -EINVAL);
|
||
assert_return(client->fd < 0, -EBUSY);
|
||
assert_return(client->xid == 0, -EINVAL);
|
||
assert_return(client->state == DHCP_STATE_INIT ||
|
||
client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
|
||
|
||
client->xid = random_u32();
|
||
|
||
r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid);
|
||
if (r < 0) {
|
||
client_stop(client, r);
|
||
return r;
|
||
}
|
||
client->fd = r;
|
||
|
||
if (client->state == DHCP_STATE_INIT) {
|
||
client->start_time = now(CLOCK_MONOTONIC);
|
||
client->secs = 0;
|
||
}
|
||
|
||
return client_initialize_events(client, client_receive_message_raw);
|
||
}
|
||
|
||
static int client_timeout_expire(sd_event_source *s, uint64_t usec,
|
||
void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
|
||
log_dhcp_client(client, "EXPIRED");
|
||
|
||
client = client_notify(client, DHCP_EVENT_EXPIRED);
|
||
|
||
/* lease was lost, start over if not freed or stopped in callback */
|
||
if (client && client->state != DHCP_STATE_STOPPED) {
|
||
client_initialize(client);
|
||
client_start(client);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
int r;
|
||
|
||
client->receive_message = sd_event_source_unref(client->receive_message);
|
||
client->fd = asynchronous_close(client->fd);
|
||
|
||
client->state = DHCP_STATE_REBINDING;
|
||
client->attempt = 1;
|
||
|
||
r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid);
|
||
if (r < 0) {
|
||
client_stop(client, r);
|
||
return 0;
|
||
}
|
||
client->fd = r;
|
||
|
||
return client_initialize_events(client, client_receive_message_raw);
|
||
}
|
||
|
||
static int client_timeout_t1(sd_event_source *s, uint64_t usec,
|
||
void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
int r;
|
||
|
||
client->state = DHCP_STATE_RENEWING;
|
||
client->attempt = 1;
|
||
|
||
r = dhcp_network_bind_udp_socket(client->lease->address,
|
||
DHCP_PORT_CLIENT);
|
||
if (r < 0) {
|
||
client_stop(client, r);
|
||
return 0;
|
||
}
|
||
|
||
client->fd = r;
|
||
|
||
return client_initialize_events(client, client_receive_message_udp);
|
||
}
|
||
|
||
static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
|
||
size_t len) {
|
||
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
|
||
int r;
|
||
|
||
r = dhcp_lease_new(&lease);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
|
||
if (r != DHCP_OFFER) {
|
||
log_dhcp_client(client, "receieved message was not an OFFER, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
|
||
lease->next_server = offer->siaddr;
|
||
|
||
lease->address = offer->yiaddr;
|
||
|
||
if (lease->address == INADDR_ANY ||
|
||
lease->server_address == INADDR_ANY ||
|
||
lease->lifetime == 0) {
|
||
log_dhcp_client(client, "receieved lease lacks address, server "
|
||
"address or lease lifetime, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
|
||
if (lease->subnet_mask == INADDR_ANY) {
|
||
r = dhcp_lease_set_default_subnet_mask(lease);
|
||
if (r < 0) {
|
||
log_dhcp_client(client, "receieved lease lacks subnet "
|
||
"mask, and a fallback one can not be "
|
||
"generated, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
}
|
||
|
||
sd_dhcp_lease_unref(client->lease);
|
||
client->lease = lease;
|
||
lease = NULL;
|
||
|
||
log_dhcp_client(client, "OFFER");
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
|
||
size_t len) {
|
||
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
|
||
int r;
|
||
|
||
r = dhcp_lease_new(&lease);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
|
||
if (r == DHCP_NAK) {
|
||
log_dhcp_client(client, "NAK");
|
||
return DHCP_EVENT_NO_LEASE;
|
||
}
|
||
|
||
if (r != DHCP_ACK) {
|
||
log_dhcp_client(client, "receieved message was not an ACK, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
|
||
lease->next_server = ack->siaddr;
|
||
|
||
lease->address = ack->yiaddr;
|
||
|
||
if (lease->address == INADDR_ANY ||
|
||
lease->server_address == INADDR_ANY ||
|
||
lease->lifetime == 0) {
|
||
log_dhcp_client(client, "receieved lease lacks address, server "
|
||
"address or lease lifetime, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
|
||
if (lease->subnet_mask == INADDR_ANY) {
|
||
r = dhcp_lease_set_default_subnet_mask(lease);
|
||
if (r < 0) {
|
||
log_dhcp_client(client, "receieved lease lacks subnet "
|
||
"mask, and a fallback one can not be "
|
||
"generated, ignoring");
|
||
return -ENOMSG;
|
||
}
|
||
}
|
||
|
||
r = DHCP_EVENT_IP_ACQUIRE;
|
||
if (client->lease) {
|
||
if (client->lease->address != lease->address ||
|
||
client->lease->subnet_mask != lease->subnet_mask ||
|
||
client->lease->router != lease->router) {
|
||
r = DHCP_EVENT_IP_CHANGE;
|
||
}
|
||
|
||
client->lease = sd_dhcp_lease_unref(client->lease);
|
||
}
|
||
|
||
client->lease = lease;
|
||
lease = NULL;
|
||
|
||
log_dhcp_client(client, "ACK");
|
||
|
||
return r;
|
||
}
|
||
|
||
static uint64_t client_compute_timeout(sd_dhcp_client *client,
|
||
uint32_t lifetime, double factor) {
|
||
assert(client);
|
||
assert(client->request_sent);
|
||
assert(lifetime);
|
||
|
||
return client->request_sent + ((lifetime - 3) * USEC_PER_SEC * factor) +
|
||
+ (random_u32() & 0x1fffff);
|
||
}
|
||
|
||
static int client_set_lease_timeouts(sd_dhcp_client *client) {
|
||
usec_t time_now;
|
||
uint64_t lifetime_timeout;
|
||
uint64_t t2_timeout;
|
||
uint64_t t1_timeout;
|
||
char time_string[FORMAT_TIMESPAN_MAX];
|
||
int r;
|
||
|
||
assert(client);
|
||
assert(client->event);
|
||
assert(client->lease);
|
||
assert(client->lease->lifetime);
|
||
|
||
client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
|
||
client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
|
||
client->timeout_expire = sd_event_source_unref(client->timeout_expire);
|
||
|
||
/* don't set timers for infinite leases */
|
||
if (client->lease->lifetime == 0xffffffff)
|
||
return 0;
|
||
|
||
r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
|
||
if (r < 0)
|
||
return r;
|
||
assert(client->request_sent <= time_now);
|
||
|
||
/* convert the various timeouts from relative (secs) to absolute (usecs) */
|
||
lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1);
|
||
if (client->lease->t1 && client->lease->t2) {
|
||
/* both T1 and T2 are given */
|
||
if (client->lease->t1 < client->lease->t2 &&
|
||
client->lease->t2 < client->lease->lifetime) {
|
||
/* they are both valid */
|
||
t2_timeout = client_compute_timeout(client, client->lease->t2, 1);
|
||
t1_timeout = client_compute_timeout(client, client->lease->t1, 1);
|
||
} else {
|
||
/* discard both */
|
||
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
|
||
client->lease->t2 = (client->lease->lifetime * 7) / 8;
|
||
t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
|
||
client->lease->t1 = client->lease->lifetime / 2;
|
||
}
|
||
} else if (client->lease->t2 && client->lease->t2 < client->lease->lifetime) {
|
||
/* only T2 is given, and it is valid */
|
||
t2_timeout = client_compute_timeout(client, client->lease->t2, 1);
|
||
t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
|
||
client->lease->t1 = client->lease->lifetime / 2;
|
||
if (t2_timeout <= t1_timeout) {
|
||
/* the computed T1 would be invalid, so discard T2 */
|
||
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
|
||
client->lease->t2 = (client->lease->lifetime * 7) / 8;
|
||
}
|
||
} else if (client->lease->t1 && client->lease->t1 < client->lease->lifetime) {
|
||
/* only T1 is given, and it is valid */
|
||
t1_timeout = client_compute_timeout(client, client->lease->t1, 1);
|
||
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
|
||
client->lease->t2 = (client->lease->lifetime * 7) / 8;
|
||
if (t2_timeout <= t1_timeout) {
|
||
/* the computed T2 would be invalid, so discard T1 */
|
||
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
|
||
client->lease->t2 = client->lease->lifetime / 2;
|
||
}
|
||
} else {
|
||
/* fall back to the default timeouts */
|
||
t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
|
||
client->lease->t1 = client->lease->lifetime / 2;
|
||
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
|
||
client->lease->t2 = (client->lease->lifetime * 7) / 8;
|
||
}
|
||
|
||
/* arm lifetime timeout */
|
||
r = sd_event_add_time(client->event, &client->timeout_expire,
|
||
CLOCK_MONOTONIC,
|
||
lifetime_timeout, 10 * USEC_PER_MSEC,
|
||
client_timeout_expire, client);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_expire,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
log_dhcp_client(client, "lease expires in %s",
|
||
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
|
||
lifetime_timeout - time_now, 0));
|
||
|
||
/* don't arm earlier timeouts if this has already expired */
|
||
if (lifetime_timeout <= time_now)
|
||
return 0;
|
||
|
||
/* arm T2 timeout */
|
||
r = sd_event_add_time(client->event,
|
||
&client->timeout_t2,
|
||
CLOCK_MONOTONIC,
|
||
t2_timeout,
|
||
10 * USEC_PER_MSEC,
|
||
client_timeout_t2, client);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_t2,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
log_dhcp_client(client, "T2 expires in %s",
|
||
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
|
||
t2_timeout - time_now, 0));
|
||
|
||
/* don't arm earlier timeout if this has already expired */
|
||
if (t2_timeout <= time_now)
|
||
return 0;
|
||
|
||
/* arm T1 timeout */
|
||
r = sd_event_add_time(client->event,
|
||
&client->timeout_t1,
|
||
CLOCK_MONOTONIC,
|
||
t1_timeout, 10 * USEC_PER_MSEC,
|
||
client_timeout_t1, client);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_t1,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
log_dhcp_client(client, "T1 expires in %s",
|
||
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
|
||
t1_timeout - time_now, 0));
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
|
||
int len) {
|
||
int r = 0, notify_event = 0;
|
||
|
||
assert(client);
|
||
assert(client->event);
|
||
assert(message);
|
||
|
||
if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
|
||
log_dhcp_client(client, "not a DHCP message: ignoring");
|
||
return 0;
|
||
}
|
||
|
||
if (message->op != BOOTREPLY) {
|
||
log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
|
||
return 0;
|
||
}
|
||
|
||
if (be32toh(message->xid) != client->xid) {
|
||
log_dhcp_client(client, "received xid (%u) does not match "
|
||
"expected (%u): ignoring",
|
||
be32toh(message->xid), client->xid);
|
||
return 0;
|
||
}
|
||
|
||
if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) {
|
||
log_dhcp_client(client, "not an ethernet packet");
|
||
return 0;
|
||
}
|
||
|
||
if (memcmp(&message->chaddr[0], &client->client_id.mac_addr,
|
||
ETH_ALEN)) {
|
||
log_dhcp_client(client, "received chaddr does not match "
|
||
"expected: ignoring");
|
||
return 0;
|
||
}
|
||
|
||
switch (client->state) {
|
||
case DHCP_STATE_SELECTING:
|
||
|
||
r = client_handle_offer(client, message, len);
|
||
if (r >= 0) {
|
||
|
||
client->timeout_resend =
|
||
sd_event_source_unref(client->timeout_resend);
|
||
|
||
client->state = DHCP_STATE_REQUESTING;
|
||
client->attempt = 1;
|
||
|
||
r = sd_event_add_time(client->event,
|
||
&client->timeout_resend,
|
||
CLOCK_MONOTONIC,
|
||
0, 0,
|
||
client_timeout_resend, client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = sd_event_source_set_priority(client->timeout_resend,
|
||
client->event_priority);
|
||
if (r < 0)
|
||
goto error;
|
||
} else if (r == -ENOMSG)
|
||
/* invalid message, let's ignore it */
|
||
return 0;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_REBOOTING:
|
||
case DHCP_STATE_REQUESTING:
|
||
case DHCP_STATE_RENEWING:
|
||
case DHCP_STATE_REBINDING:
|
||
|
||
r = client_handle_ack(client, message, len);
|
||
if (r == DHCP_EVENT_NO_LEASE) {
|
||
|
||
client->timeout_resend =
|
||
sd_event_source_unref(client->timeout_resend);
|
||
|
||
if (client->state == DHCP_STATE_REBOOTING) {
|
||
r = client_initialize(client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
r = client_start(client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
log_dhcp_client(client, "REBOOTED");
|
||
}
|
||
|
||
goto error;
|
||
} else if (r >= 0) {
|
||
client->timeout_resend =
|
||
sd_event_source_unref(client->timeout_resend);
|
||
|
||
if (IN_SET(client->state, DHCP_STATE_REQUESTING,
|
||
DHCP_STATE_REBOOTING))
|
||
notify_event = DHCP_EVENT_IP_ACQUIRE;
|
||
else if (r != DHCP_EVENT_IP_ACQUIRE)
|
||
notify_event = r;
|
||
|
||
client->state = DHCP_STATE_BOUND;
|
||
client->attempt = 1;
|
||
|
||
client->last_addr = client->lease->address;
|
||
|
||
r = client_set_lease_timeouts(client);
|
||
if (r < 0)
|
||
goto error;
|
||
|
||
if (notify_event) {
|
||
client = client_notify(client, notify_event);
|
||
if (!client ||
|
||
client->state == DHCP_STATE_STOPPED)
|
||
return 0;
|
||
}
|
||
|
||
client->receive_message =
|
||
sd_event_source_unref(client->receive_message);
|
||
client->fd = asynchronous_close(client->fd);
|
||
} else if (r == -ENOMSG)
|
||
/* invalid message, let's ignore it */
|
||
return 0;
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_INIT:
|
||
case DHCP_STATE_INIT_REBOOT:
|
||
case DHCP_STATE_BOUND:
|
||
|
||
break;
|
||
|
||
case DHCP_STATE_STOPPED:
|
||
r = -EINVAL;
|
||
goto error;
|
||
}
|
||
|
||
error:
|
||
if (r < 0 || r == DHCP_EVENT_NO_LEASE)
|
||
client_stop(client, r);
|
||
|
||
return r;
|
||
}
|
||
|
||
static int client_receive_message_udp(sd_event_source *s, int fd,
|
||
uint32_t revents, void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
_cleanup_free_ DHCPMessage *message = NULL;
|
||
int buflen = 0, len, r;
|
||
|
||
assert(s);
|
||
assert(client);
|
||
|
||
r = ioctl(fd, FIONREAD, &buflen);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (buflen < 0)
|
||
/* this can't be right */
|
||
return -EIO;
|
||
|
||
message = malloc0(buflen);
|
||
if (!message)
|
||
return -ENOMEM;
|
||
|
||
len = read(fd, message, buflen);
|
||
if (len < 0) {
|
||
log_dhcp_client(client, "could not receive message from UDP "
|
||
"socket: %s", strerror(errno));
|
||
return 0;
|
||
} else if ((size_t)len < sizeof(DHCPMessage))
|
||
return 0;
|
||
|
||
return client_handle_message(client, message, len);
|
||
}
|
||
|
||
static int client_receive_message_raw(sd_event_source *s, int fd,
|
||
uint32_t revents, void *userdata) {
|
||
sd_dhcp_client *client = userdata;
|
||
_cleanup_free_ DHCPPacket *packet = NULL;
|
||
uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
|
||
struct iovec iov = {};
|
||
struct msghdr msg = {
|
||
.msg_iov = &iov,
|
||
.msg_iovlen = 1,
|
||
.msg_control = cmsgbuf,
|
||
.msg_controllen = sizeof(cmsgbuf),
|
||
};
|
||
struct cmsghdr *cmsg;
|
||
bool checksum = true;
|
||
int buflen = 0, len, r;
|
||
|
||
assert(s);
|
||
assert(client);
|
||
|
||
r = ioctl(fd, FIONREAD, &buflen);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (buflen < 0)
|
||
/* this can't be right */
|
||
return -EIO;
|
||
|
||
packet = malloc0(buflen);
|
||
if (!packet)
|
||
return -ENOMEM;
|
||
|
||
iov.iov_base = packet;
|
||
iov.iov_len = buflen;
|
||
|
||
len = recvmsg(fd, &msg, 0);
|
||
if (len < 0) {
|
||
log_dhcp_client(client, "could not receive message from raw "
|
||
"socket: %s", strerror(errno));
|
||
return 0;
|
||
} else if ((size_t)len < sizeof(DHCPPacket))
|
||
return 0;
|
||
|
||
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
|
||
if (cmsg->cmsg_level == SOL_PACKET &&
|
||
cmsg->cmsg_type == PACKET_AUXDATA &&
|
||
cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
|
||
struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg);
|
||
|
||
checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
|
||
break;
|
||
}
|
||
}
|
||
|
||
r = dhcp_packet_verify_headers(packet, len, checksum);
|
||
if (r < 0)
|
||
return 0;
|
||
|
||
len -= DHCP_IP_UDP_SIZE;
|
||
|
||
return client_handle_message(client, &packet->dhcp, len);
|
||
}
|
||
|
||
int sd_dhcp_client_start(sd_dhcp_client *client) {
|
||
int r;
|
||
|
||
assert_return(client, -EINVAL);
|
||
|
||
r = client_initialize(client);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (client->last_addr)
|
||
client->state = DHCP_STATE_INIT_REBOOT;
|
||
|
||
r = client_start(client);
|
||
if (r >= 0)
|
||
log_dhcp_client(client, "STARTED on ifindex %u with address %s",
|
||
client->index,
|
||
ether_ntoa(&client->client_id.mac_addr));
|
||
|
||
return r;
|
||
}
|
||
|
||
int sd_dhcp_client_stop(sd_dhcp_client *client) {
|
||
assert_return(client, -EINVAL);
|
||
|
||
if (client_stop(client, DHCP_EVENT_STOP))
|
||
client->state = DHCP_STATE_STOPPED;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int sd_dhcp_client_attach_event(sd_dhcp_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_dhcp_client_detach_event(sd_dhcp_client *client) {
|
||
assert_return(client, -EINVAL);
|
||
|
||
client->event = sd_event_unref(client->event);
|
||
|
||
return 0;
|
||
}
|
||
|
||
sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
|
||
if (!client)
|
||
return NULL;
|
||
|
||
return client->event;
|
||
}
|
||
|
||
sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) {
|
||
if (client)
|
||
assert_se(REFCNT_INC(client->n_ref) >= 2);
|
||
|
||
return client;
|
||
}
|
||
|
||
sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) {
|
||
if (client && REFCNT_DEC(client->n_ref) <= 0) {
|
||
log_dhcp_client(client, "UNREF");
|
||
|
||
client_initialize(client);
|
||
|
||
client->receive_message =
|
||
sd_event_source_unref(client->receive_message);
|
||
|
||
sd_dhcp_client_detach_event(client);
|
||
|
||
sd_dhcp_lease_unref(client->lease);
|
||
|
||
free(client->req_opts);
|
||
free(client);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
return client;
|
||
}
|
||
|
||
DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_unref);
|
||
#define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_unrefp)
|
||
|
||
int sd_dhcp_client_new(sd_dhcp_client **ret) {
|
||
_cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
|
||
|
||
assert_return(ret, -EINVAL);
|
||
|
||
client = new0(sd_dhcp_client, 1);
|
||
if (!client)
|
||
return -ENOMEM;
|
||
|
||
client->n_ref = REFCNT_INIT;
|
||
client->state = DHCP_STATE_INIT;
|
||
client->index = -1;
|
||
client->fd = -1;
|
||
client->attempt = 1;
|
||
|
||
client->req_opts_size = ELEMENTSOF(default_req_opts);
|
||
|
||
client->req_opts = memdup(default_req_opts, client->req_opts_size);
|
||
if (!client->req_opts)
|
||
return -ENOMEM;
|
||
|
||
*ret = client;
|
||
client = NULL;
|
||
|
||
return 0;
|
||
}
|