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systemd/src/libsystemd-network/sd-dhcp-client.c
Dan Williams e37f74a6d5 sd-dhcp-lease: load/save client ID 
The lease is usually tied to the client ID, so users of the
lease may want to know what client ID it was acquired with.
2014-11-19 00:58:51 +01:00

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/***
This file is part of systemd.
Copyright (C) 2013 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 <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include <linux/if_infiniband.h>
#include <netinet/ether.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include "util.h"
#include "list.h"
#include "refcnt.h"
#include "async.h"
#include "dhcp-protocol.h"
#include "dhcp-internal.h"
#include "dhcp-lease-internal.h"
#include "sd-dhcp-client.h"
#define MAX_CLIENT_ID_LEN 64 /* Arbitrary limit */
#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
struct sd_dhcp_client {
RefCount n_ref;
DHCPState state;
sd_event *event;
int event_priority;
sd_event_source *timeout_resend;
int index;
int fd;
union sockaddr_union link;
sd_event_source *receive_message;
bool request_broadcast;
uint8_t *req_opts;
size_t req_opts_allocated;
size_t req_opts_size;
be32_t last_addr;
uint8_t mac_addr[MAX_MAC_ADDR_LEN];
size_t mac_addr_len;
uint16_t arp_type;
union {
struct {
uint8_t type; /* 0: Generic (non-LL) (RFC 2132) */
uint8_t data[MAX_CLIENT_ID_LEN];
} _packed_ gen;
struct {
uint8_t type; /* 1: Ethernet Link-Layer (RFC 2132) */
uint8_t haddr[ETH_ALEN];
} _packed_ eth;
struct {
uint8_t type; /* 2 - 254: ARP/Link-Layer (RFC 2132) */
uint8_t haddr[0];
} _packed_ ll;
struct {
uint8_t type; /* 255: Node-specific (RFC 4361) */
uint8_t iaid[4];
uint8_t duid[MAX_CLIENT_ID_LEN - 4];
} _packed_ ns;
struct {
uint8_t type;
uint8_t data[MAX_CLIENT_ID_LEN];
} _packed_ raw;
} client_id;
size_t client_id_len;
char *hostname;
char *vendor_class_identifier;
uint32_t mtu;
uint32_t xid;
usec_t start_time;
unsigned int attempt;
usec_t request_sent;
sd_event_source *timeout_t1;
sd_event_source *timeout_t2;
sd_event_source *timeout_expire;
sd_dhcp_client_cb_t cb;
void *userdata;
sd_dhcp_lease *lease;
};
static const uint8_t default_req_opts[] = {
DHCP_OPTION_SUBNET_MASK,
DHCP_OPTION_ROUTER,
DHCP_OPTION_HOST_NAME,
DHCP_OPTION_DOMAIN_NAME,
DHCP_OPTION_DOMAIN_NAME_SERVER,
DHCP_OPTION_NTP_SERVER,
};
static int client_receive_message_raw(sd_event_source *s, int fd,
uint32_t revents, void *userdata);
static int client_receive_message_udp(sd_event_source *s, int fd,
uint32_t revents, void *userdata);
static void client_stop(sd_dhcp_client *client, int error);
int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
void *userdata) {
assert_return(client, -EINVAL);
client->cb = cb;
client->userdata = userdata;
return 0;
}
int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) {
assert_return(client, -EINVAL);
client->request_broadcast = !!broadcast;
return 0;
}
int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
size_t i;
assert_return(client, -EINVAL);
assert_return (IN_SET(client->state, DHCP_STATE_INIT,
DHCP_STATE_STOPPED), -EBUSY);
switch(option) {
case DHCP_OPTION_PAD:
case DHCP_OPTION_OVERLOAD:
case DHCP_OPTION_MESSAGE_TYPE:
case DHCP_OPTION_PARAMETER_REQUEST_LIST:
case DHCP_OPTION_END:
return -EINVAL;
default:
break;
}
for (i = 0; i < client->req_opts_size; i++)
if (client->req_opts[i] == option)
return -EEXIST;
if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
client->req_opts_size + 1))
return -ENOMEM;
client->req_opts[client->req_opts_size++] = option;
return 0;
}
int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
const struct in_addr *last_addr) {
assert_return(client, -EINVAL);
assert_return (IN_SET(client->state, DHCP_STATE_INIT,
DHCP_STATE_STOPPED), -EBUSY);
if (last_addr)
client->last_addr = last_addr->s_addr;
else
client->last_addr = INADDR_ANY;
return 0;
}
int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
assert_return(client, -EINVAL);
assert_return (IN_SET(client->state, DHCP_STATE_INIT,
DHCP_STATE_STOPPED), -EBUSY);
assert_return(interface_index > 0, -EINVAL);
client->index = interface_index;
return 0;
}
int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr,
size_t addr_len, uint16_t arp_type) {
DHCP_CLIENT_DONT_DESTROY(client);
bool need_restart = false;
assert_return(client, -EINVAL);
assert_return(addr, -EINVAL);
assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL);
assert_return(arp_type > 0, -EINVAL);
if (arp_type == ARPHRD_ETHER)
assert_return(addr_len == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
else
return -EINVAL;
if (client->mac_addr_len == addr_len &&
memcmp(&client->mac_addr, addr, addr_len) == 0)
return 0;
if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
log_dhcp_client(client, "Changing MAC address on running DHCP "
"client, restarting");
need_restart = true;
client_stop(client, DHCP_EVENT_STOP);
}
memcpy(&client->mac_addr, addr, addr_len);
client->mac_addr_len = addr_len;
client->arp_type = arp_type;
if (need_restart && client->state != DHCP_STATE_STOPPED)
sd_dhcp_client_start(client);
return 0;
}
int sd_dhcp_client_get_client_id(sd_dhcp_client *client, uint8_t *type,
const uint8_t **data, size_t *data_len) {
assert_return(client, -EINVAL);
assert_return(type, -EINVAL);
assert_return(data, -EINVAL);
assert_return(data_len, -EINVAL);
*type = 0;
*data = NULL;
*data_len = 0;
if (client->client_id_len) {
*type = client->client_id.raw.type;
*data = client->client_id.raw.data;
*data_len = client->client_id_len -
sizeof (client->client_id.raw.type);
}
return 0;
}
int sd_dhcp_client_set_client_id(sd_dhcp_client *client, uint8_t type,
const uint8_t *data, size_t data_len) {
DHCP_CLIENT_DONT_DESTROY(client);
bool need_restart = false;
assert_return(client, -EINVAL);
assert_return(data, -EINVAL);
assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL);
switch (type) {
case ARPHRD_ETHER:
if (data_len != ETH_ALEN)
return -EINVAL;
break;
case ARPHRD_INFINIBAND:
if (data_len != INFINIBAND_ALEN)
return -EINVAL;
break;
default:
break;
}
if (client->client_id_len == data_len + sizeof (client->client_id.raw.type) &&
client->client_id.raw.type == type &&
memcmp(&client->client_id.raw.data, data, data_len) == 0)
return 0;
if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
log_dhcp_client(client, "Changing client ID on running DHCP "
"client, restarting");
need_restart = true;
client_stop(client, DHCP_EVENT_STOP);
}
client->client_id.raw.type = type;
memcpy(&client->client_id.raw.data, data, data_len);
client->client_id_len = data_len + sizeof (client->client_id.raw.type);
if (need_restart && client->state != DHCP_STATE_STOPPED)
sd_dhcp_client_start(client);
return 0;
}
int sd_dhcp_client_set_hostname(sd_dhcp_client *client,
const char *hostname) {
char *new_hostname = NULL;
assert_return(client, -EINVAL);
if (streq_ptr(client->hostname, hostname))
return 0;
if (hostname) {
new_hostname = strdup(hostname);
if (!new_hostname)
return -ENOMEM;
}
free(client->hostname);
client->hostname = new_hostname;
return 0;
}
int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client,
const char *vci) {
char *new_vci = NULL;
assert_return(client, -EINVAL);
new_vci = strdup(vci);
if (!new_vci)
return -ENOMEM;
free(client->vendor_class_identifier);
client->vendor_class_identifier = new_vci;
return 0;
}
int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) {
assert_return(client, -EINVAL);
assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE);
client->mtu = mtu;
return 0;
}
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
assert_return(client, -EINVAL);
assert_return(ret, -EINVAL);
if (client->state != DHCP_STATE_BOUND &&
client->state != DHCP_STATE_RENEWING &&
client->state != DHCP_STATE_REBINDING)
return -EADDRNOTAVAIL;
*ret = sd_dhcp_lease_ref(client->lease);
return 0;
}
static void client_notify(sd_dhcp_client *client, int event) {
if (client->cb)
client->cb(client, event, client->userdata);
}
static int client_initialize(sd_dhcp_client *client) {
assert_return(client, -EINVAL);
client->receive_message =
sd_event_source_unref(client->receive_message);
client->fd = asynchronous_close(client->fd);
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
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);
client->attempt = 1;
client->state = DHCP_STATE_INIT;
client->xid = 0;
if (client->lease)
client->lease = sd_dhcp_lease_unref(client->lease);
return 0;
}
static void client_stop(sd_dhcp_client *client, int error) {
assert(client);
if (error < 0)
log_dhcp_client(client, "STOPPED: %s", strerror(-error));
else if (error == DHCP_EVENT_STOP)
log_dhcp_client(client, "STOPPED");
else
log_dhcp_client(client, "STOPPED: Unknown event");
client_notify(client, error);
client_initialize(client);
}
static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret,
uint8_t type, size_t *_optlen, size_t *_optoffset) {
_cleanup_free_ DHCPPacket *packet;
size_t optlen, optoffset, size;
be16_t max_size;
usec_t time_now;
uint16_t secs;
int r;
assert(client);
assert(client->start_time);
assert(ret);
assert(_optlen);
assert(_optoffset);
assert(type == DHCP_DISCOVER || type == DHCP_REQUEST);
optlen = DHCP_MIN_OPTIONS_SIZE;
size = sizeof(DHCPPacket) + optlen;
packet = malloc0(size);
if (!packet)
return -ENOMEM;
r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
client->arp_type, optlen, &optoffset);
if (r < 0)
return r;
/* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
refuse to issue an DHCP lease if 'secs' is set to zero */
r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
return r;
assert(time_now >= client->start_time);
/* seconds between sending first and last DISCOVER
* must always be strictly positive to deal with broken servers */
secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
packet->dhcp.secs = htobe16(secs);
/* RFC2132 section 4.1
A client that cannot receive unicast IP datagrams until its protocol
software has been configured with an IP address SHOULD set the
BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or
DHCPREQUEST messages that client sends. The BROADCAST bit will
provide a hint to the DHCP server and BOOTP relay agent to broadcast
any messages to the client on the client's subnet.
Note: some interfaces needs this to be enabled, but some networks
needs this to be disabled as broadcasts are filteretd, so this
needs to be configurable */
if (client->request_broadcast || client->arp_type != ARPHRD_ETHER)
packet->dhcp.flags = htobe16(0x8000);
/* RFC2132 section 4.1.1:
The client MUST include its hardware address in the ’chaddr’ field, if
necessary for delivery of DHCP reply messages. Non-Ethernet
interfaces will leave 'chaddr' empty and use the client identifier
instead (eg, RFC 4390 section 2.1).
*/
if (client->arp_type == ARPHRD_ETHER)
memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN);
/* If no client identifier exists, construct one from an ethernet
address if present */
if (client->client_id_len == 0 && client->arp_type == ARPHRD_ETHER) {
client->client_id.eth.type = ARPHRD_ETHER;
memcpy(&client->client_id.eth.haddr, &client->mac_addr, ETH_ALEN);
client->client_id_len = sizeof (client->client_id.eth);
}
/* Some DHCP servers will refuse to issue an DHCP lease if the Client
Identifier option is not set */
if (client->client_id_len) {
r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_CLIENT_IDENTIFIER,
client->client_id_len,
&client->client_id.raw);
if (r < 0)
return r;
}
/* RFC2131 section 3.5:
in its initial DHCPDISCOVER or DHCPREQUEST message, a
client may provide the server with a list of specific
parameters the client is interested in. If the client
includes a list of parameters in a DHCPDISCOVER message,
it MUST include that list in any subsequent DHCPREQUEST
messages.
*/
r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_PARAMETER_REQUEST_LIST,
client->req_opts_size, client->req_opts);
if (r < 0)
return r;
/* RFC2131 section 3.5:
The client SHOULD include the ’maximum DHCP message size’ option to
let the server know how large the server may make its DHCP messages.
Note (from ConnMan): Some DHCP servers will send bigger DHCP packets
than the defined default size unless the Maximum Messge Size option
is explicitely set
RFC3442 "Requirements to Avoid Sizing Constraints":
Because a full routing table can be quite large, the standard 576
octet maximum size for a DHCP message may be too short to contain
some legitimate Classless Static Route options. Because of this,
clients implementing the Classless Static Route option SHOULD send a
Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP
stack is capable of receiving larger IP datagrams. In this case, the
client SHOULD set the value of this option to at least the MTU of the
interface that the client is configuring. The client MAY set the
value of this option higher, up to the size of the largest UDP packet
it is prepared to accept. (Note that the value specified in the
Maximum DHCP Message Size option is the total maximum packet size,
including IP and UDP headers.)
*/
max_size = htobe16(size);
r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0,
DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
2, &max_size);
if (r < 0)
return r;
*_optlen = optlen;
*_optoffset = optoffset;
*ret = packet;
packet = NULL;
return 0;
}
static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
size_t len) {
dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
INADDR_BROADCAST, DHCP_PORT_SERVER, len);
return dhcp_network_send_raw_socket(client->fd, &client->link,
packet, len);
}
static int client_send_discover(sd_dhcp_client *client) {
_cleanup_free_ DHCPPacket *discover = NULL;
size_t optoffset, optlen;
int r;
assert(client);
assert(client->state == DHCP_STATE_INIT ||
client->state == DHCP_STATE_SELECTING);
r = client_message_init(client, &discover, DHCP_DISCOVER,
&optlen, &optoffset);
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
address be assigned, and may include the ’IP address lease time’
option to suggest the lease time it would like.
*/
if (client->last_addr != INADDR_ANY) {
r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_REQUESTED_IP_ADDRESS,
4, &client->last_addr);
if (r < 0)
return r;
}
/* it is unclear from RFC 2131 if client should send hostname in
DHCPDISCOVER but dhclient does and so we do as well
*/
if (client->hostname) {
r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_HOST_NAME,
strlen(client->hostname), client->hostname);
if (r < 0)
return r;
}
if (client->vendor_class_identifier) {
r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
strlen(client->vendor_class_identifier),
client->vendor_class_identifier);
if (r < 0)
return r;
}
r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
/* We currently ignore:
The client SHOULD wait a random time between one and ten seconds to
desynchronize the use of DHCP at startup.
*/
r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset);
if (r < 0)
return r;
log_dhcp_client(client, "DISCOVER");
return 0;
}
static int client_send_request(sd_dhcp_client *client) {
_cleanup_free_ DHCPPacket *request = NULL;
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;
}
if (client->hostname) {
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_HOST_NAME,
strlen(client->hostname), client->hostname);
if (r < 0)
return r;
}
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;
DHCP_CLIENT_DONT_DESTROY(client);
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_boottime_or_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_boottime_or_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;
r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
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_io_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;
r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message");
if (r < 0)
goto error;
error:
if (r < 0)
client_stop(client, r);
return 0;
}
static int client_initialize_time_events(sd_dhcp_client *client) {
int r;
assert(client);
assert(client->event);
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
r = sd_event_add_time(client->event,
&client->timeout_resend,
clock_boottime_or_monotonic(),
0, 0,
client_timeout_resend, client);
if (r < 0)
goto error;
r = sd_event_source_set_priority(client->timeout_resend,
client->event_priority);
r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
if (r < 0)
goto error;
error:
if (r < 0)
client_stop(client, r);
return 0;
}
static int client_initialize_events(sd_dhcp_client *client,
sd_event_io_handler_t io_callback) {
client_initialize_io_events(client, io_callback);
client_initialize_time_events(client);
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, client->mac_addr,
client->mac_addr_len, client->arp_type);
if (r < 0) {
client_stop(client, r);
return r;
}
client->fd = r;
if (client->state == DHCP_STATE_INIT || client->state == DHCP_STATE_INIT_REBOOT)
client->start_time = now(clock_boottime_or_monotonic());
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;
DHCP_CLIENT_DONT_DESTROY(client);
log_dhcp_client(client, "EXPIRED");
client_notify(client, DHCP_EVENT_EXPIRED);
/* lease was lost, start over if not freed or stopped in callback */
if (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;
DHCP_CLIENT_DONT_DESTROY(client);
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, client->mac_addr,
client->mac_addr_len, client->arp_type);
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;
DHCP_CLIENT_DONT_DESTROY(client);
client->state = DHCP_STATE_RENEWING;
client->attempt = 1;
return client_initialize_time_events(client);
}
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;
if (client->client_id_len) {
r = dhcp_lease_set_client_id(lease,
(uint8_t *) &client->client_id.raw,
client->client_id_len);
if (r < 0)
return r;
}
r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
if (r != DHCP_OFFER) {
log_dhcp_client(client, "received 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, "received 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, "received 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_forcerenew(sd_dhcp_client *client, DHCPMessage *force,
size_t len) {
int r;
r = dhcp_option_parse(force, len, NULL, NULL);
if (r != DHCP_FORCERENEW)
return -ENOMSG;
log_dhcp_client(client, "FORCERENEW");
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;
if (client->client_id_len) {
r = dhcp_lease_set_client_id(lease,
(uint8_t *) &client->client_id.raw,
client->client_id_len);
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 -EADDRNOTAVAIL;
}
if (r != DHCP_ACK) {
log_dhcp_client(client, "received 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, "received 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, "received 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;
} else
r = DHCP_EVENT_RENEW;
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_boottime_or_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_boottime_or_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;
r = sd_event_source_set_description(client->timeout_expire, "dhcp4-lifetime");
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_boottime_or_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;
r = sd_event_source_set_description(client->timeout_t2, "dhcp4-t2-timeout");
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_boottime_or_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;
r = sd_event_source_set_description(client->timeout_t1, "dhcp4-t1-timer");
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) {
DHCP_CLIENT_DONT_DESTROY(client);
int r = 0, notify_event = 0;
assert(client);
assert(client->event);
assert(message);
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_boottime_or_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;
r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
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 >= 0) {
client->timeout_resend =
sd_event_source_unref(client->timeout_resend);
client->receive_message =
sd_event_source_unref(client->receive_message);
client->fd = asynchronous_close(client->fd);
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;
r = dhcp_network_bind_udp_socket(client->lease->address,
DHCP_PORT_CLIENT);
if (r < 0) {
log_dhcp_client(client, "could not bind UDP socket");
goto error;
}
client->fd = r;
client_initialize_io_events(client, client_receive_message_udp);
if (notify_event) {
client_notify(client, notify_event);
if (client->state == DHCP_STATE_STOPPED)
return 0;
}
} else if (r == -EADDRNOTAVAIL) {
/* got a NAK, let's restart the client */
client->timeout_resend =
sd_event_source_unref(client->timeout_resend);
r = client_initialize(client);
if (r < 0)
goto error;
r = client_start(client);
if (r < 0)
goto error;
log_dhcp_client(client, "REBOOTED");
return 0;
} else if (r == -ENOMSG)
/* invalid message, let's ignore it */
return 0;
break;
case DHCP_STATE_BOUND:
r = client_handle_forcerenew(client, message, len);
if (r >= 0) {
r = client_timeout_t1(NULL, 0, client);
if (r < 0)
goto error;
} else if (r == -ENOMSG)
/* invalid message, let's ignore it */
return 0;
break;
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
break;
case DHCP_STATE_STOPPED:
r = -EINVAL;
goto error;
}
error:
if (r < 0)
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;
const struct ether_addr zero_mac = { { 0, 0, 0, 0, 0, 0 } };
const struct ether_addr *expected_chaddr = NULL;
uint8_t expected_hlen = 0;
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: %m");
return 0;
} else if ((size_t)len < sizeof(DHCPMessage)) {
log_dhcp_client(client, "too small to be a DHCP message: ignoring");
return 0;
}
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 (message->htype != client->arp_type) {
log_dhcp_client(client, "packet type does not match client type");
return 0;
}
if (client->arp_type == ARPHRD_ETHER) {
expected_hlen = ETH_ALEN;
expected_chaddr = (const struct ether_addr *) &client->mac_addr;
} else {
/* Non-ethernet links expect zero chaddr */
expected_hlen = 0;
expected_chaddr = &zero_mac;
}
if (message->hlen != expected_hlen) {
log_dhcp_client(client, "unexpected packet hlen %d", message->hlen);
return 0;
}
if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) {
log_dhcp_client(client, "received chaddr does not match "
"expected: ignoring");
return 0;
}
if (client->state != DHCP_STATE_BOUND &&
be32toh(message->xid) != client->xid) {
/* in BOUND state, we may receive FORCERENEW with xid set by server,
so ignore the xid in this case */
log_dhcp_client(client, "received xid (%u) does not match "
"expected (%u): ignoring",
be32toh(message->xid), client->xid);
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: %m");
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", client->index);
return r;
}
int sd_dhcp_client_stop(sd_dhcp_client *client) {
DHCP_CLIENT_DONT_DESTROY(client);
assert_return(client, -EINVAL);
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, "FREE");
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->hostname);
free(client->vendor_class_identifier);
free(client);
}
return NULL;
}
int sd_dhcp_client_new(sd_dhcp_client **ret) {
_cleanup_dhcp_client_unref_ 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->mtu = DHCP_DEFAULT_MIN_SIZE;
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;
}
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