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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <sys/ioctl.h>
+#include <linux/if_infiniband.h>
-#include "util.h"
-#include "list.h"
-#include "refcnt.h"
-#include "async.h"
+#include "sd-dhcp-client.h"
-#include "dhcp-protocol.h"
+#include "alloc-util.h"
+#include "async.h"
+#include "dhcp-identifier.h"
#include "dhcp-internal.h"
#include "dhcp-lease-internal.h"
-#include "sd-dhcp-client.h"
+#include "dhcp-protocol.h"
+#include "random-util.h"
+#include "string-util.h"
+#include "util.h"
-#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
+#define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */
+#define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN)
struct sd_dhcp_client {
- RefCount n_ref;
+ unsigned n_ref;
DHCPState state;
sd_event *event;
size_t req_opts_allocated;
size_t req_opts_size;
be32_t last_addr;
- struct {
- uint8_t type;
- struct ether_addr mac_addr;
- } _packed_ client_id;
uint8_t mac_addr[MAX_MAC_ADDR_LEN];
size_t mac_addr_len;
uint16_t arp_type;
+ struct {
+ uint8_t type;
+ union {
+ struct {
+ /* 0: Generic (non-LL) (RFC 2132) */
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ gen;
+ struct {
+ /* 1: Ethernet Link-Layer (RFC 2132) */
+ uint8_t haddr[ETH_ALEN];
+ } _packed_ eth;
+ struct {
+ /* 2 - 254: ARP/Link-Layer (RFC 2132) */
+ uint8_t haddr[0];
+ } _packed_ ll;
+ struct {
+ /* 255: Node-specific (RFC 4361) */
+ uint32_t iaid;
+ struct duid duid;
+ } _packed_ ns;
+ struct {
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ raw;
+ };
+ } _packed_ client_id;
+ size_t client_id_len;
char *hostname;
char *vendor_class_identifier;
uint32_t mtu;
uint32_t xid;
usec_t start_time;
- uint16_t secs;
unsigned int attempt;
usec_t request_sent;
sd_event_source *timeout_t1;
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,
log_dhcp_client(client, "Changing MAC address on running DHCP "
"client, restarting");
need_restart = true;
- client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
}
memcpy(&client->mac_addr, addr, addr_len);
client->mac_addr_len = addr_len;
client->arp_type = arp_type;
- memcpy(&client->client_id.mac_addr, addr, ETH_ALEN);
- client->client_id.type = 0x01;
+ 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.type;
+ *data = client->client_id.raw.data;
+ *data_len = client->client_id_len - sizeof(client->client_id.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.type) &&
+ client->client_id.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, SD_DHCP_CLIENT_EVENT_STOP);
+ }
+
+ client->client_id.type = type;
+ memcpy(&client->client_id.raw.data, data, data_len);
+ client->client_id_len = data_len + sizeof (client->client_id.type);
if (need_restart && client->state != DHCP_STATE_STOPPED)
sd_dhcp_client_start(client);
client->state != DHCP_STATE_REBINDING)
return -EADDRNOTAVAIL;
- *ret = sd_dhcp_lease_ref(client->lease);
+ *ret = client->lease;
return 0;
}
client->state = DHCP_STATE_INIT;
client->xid = 0;
- if (client->lease)
- client->lease = sd_dhcp_lease_unref(client->lease);
+ client->lease = sd_dhcp_lease_unref(client->lease);
return 0;
}
if (error < 0)
log_dhcp_client(client, "STOPPED: %s", strerror(-error));
- else if (error == DHCP_EVENT_STOP)
+ else if (error == SD_DHCP_CLIENT_EVENT_STOP)
log_dhcp_client(client, "STOPPED");
else
log_dhcp_client(client, "STOPPED: Unknown event");
_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->secs);
+ assert(client->start_time);
assert(ret);
assert(_optlen);
assert(_optoffset);
/* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
refuse to issue an DHCP lease if 'secs' is set to zero */
- packet->dhcp.secs = htobe16(client->secs);
+ 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
if (client->arp_type == ARPHRD_ETHER)
memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN);
+ /* If no client identifier exists, construct an RFC 4361-compliant one */
+ if (client->client_id_len == 0) {
+ size_t duid_len;
+
+ client->client_id.type = 255;
+
+ r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->client_id.ns.iaid);
+ if (r < 0)
+ return r;
+
+ r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len);
+ if (r < 0)
+ return r;
+
+ client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len;
+ }
+
/* Some DHCP servers will refuse to issue an DHCP lease if the Client
Identifier option is not set */
- r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
- DHCP_OPTION_CLIENT_IDENTIFIER,
- sizeof(client->client_id), &client->client_id);
- if (r < 0)
- return r;
-
+ 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);
+ if (r < 0)
+ return r;
+ }
/* RFC2131 section 3.5:
in its initial DHCPDISCOVER or DHCPREQUEST message, a
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
+ is explicitly set
RFC3442 "Requirements to Avoid Sizing Constraints":
Because a full routing table can be quite large, the standard 576
static int client_send_discover(sd_dhcp_client *client) {
_cleanup_free_ DHCPPacket *discover = NULL;
size_t optoffset, optlen;
- usec_t time_now;
int r;
assert(client);
assert(client->state == DHCP_STATE_INIT ||
client->state == DHCP_STATE_SELECTING);
- /* See RFC2131 section 4.4.1 */
-
- 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 */
- client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
-
r = client_message_init(client, &discover, DHCP_DISCOVER,
&optlen, &optoffset);
if (r < 0)
if (r < 0)
goto error;
- r = sd_event_source_set_name(client->timeout_resend,
- "dhcp4-resend-timer");
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
if (r < 0)
goto error;
if (r < 0)
goto error;
- r = sd_event_source_set_name(client->receive_message,
- "dhcp4-receive-message");
+ r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message");
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_name(client->timeout_resend,
- "dhcp4-resend-timer");
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
if (r < 0)
goto error;
}
client->fd = r;
- if (client->state == DHCP_STATE_INIT) {
+ if (client->state == DHCP_STATE_INIT || client->state == DHCP_STATE_INIT_REBOOT)
client->start_time = now(clock_boottime_or_monotonic());
- client->secs = 0;
- }
return client_initialize_events(client, client_receive_message_raw);
}
log_dhcp_client(client, "EXPIRED");
- client_notify(client, DHCP_EVENT_EXPIRED);
+ client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED);
/* lease was lost, start over if not freed or stopped in callback */
if (client->state != DHCP_STATE_STOPPED) {
if (r < 0)
return r;
+ if (client->client_id_len) {
+ r = dhcp_lease_set_client_id(lease,
+ (uint8_t *) &client->client_id,
+ 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");
}
lease->next_server = offer->siaddr;
-
lease->address = offer->yiaddr;
- if (lease->address == INADDR_ANY ||
- lease->server_address == INADDR_ANY ||
+ if (lease->address == 0 ||
+ lease->server_address == 0 ||
lease->lifetime == 0) {
- log_dhcp_client(client, "received lease lacks address, server "
- "address or lease lifetime, ignoring");
+ log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring");
return -ENOMSG;
}
- if (lease->subnet_mask == INADDR_ANY) {
+ if (!lease->have_subnet_mask) {
r = dhcp_lease_set_default_subnet_mask(lease);
if (r < 0) {
log_dhcp_client(client, "received lease lacks subnet "
if (r < 0)
return r;
+ if (client->client_id_len) {
+ r = dhcp_lease_set_client_id(lease,
+ (uint8_t *) &client->client_id,
+ 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");
}
}
- r = DHCP_EVENT_IP_ACQUIRE;
+ r = SD_DHCP_CLIENT_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;
+ r = SD_DHCP_CLIENT_EVENT_IP_CHANGE;
} else
- r = DHCP_EVENT_RENEW;
+ r = SD_DHCP_CLIENT_EVENT_RENEW;
client->lease = sd_dhcp_lease_unref(client->lease);
}
return r;
}
-static uint64_t client_compute_timeout(sd_dhcp_client *client,
- uint32_t lifetime, double factor) {
+static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) {
assert(client);
assert(client->request_sent);
- assert(lifetime);
+ assert(lifetime > 0);
+
+ if (lifetime > 3)
+ lifetime -= 3;
+ else
+ lifetime = 0;
- return client->request_sent + ((lifetime - 3) * USEC_PER_SEC * factor) +
+ return client->request_sent + (lifetime * USEC_PER_SEC * factor) +
+ (random_u32() & 0x1fffff);
}
/* 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) {
+ if (client->lease->t1 > 0 && client->lease->t2 > 0) {
/* both T1 and T2 are given */
if (client->lease->t1 < client->lease->t2 &&
client->lease->t2 < client->lease->lifetime) {
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) {
+ } else if (client->lease->t2 > 0 && 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);
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) {
+ } else if (client->lease->t1 > 0 && 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);
if (r < 0)
return r;
- r = sd_event_source_set_name(client->timeout_expire,
- "dhcp4-lifetime");
+ 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));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC));
/* don't arm earlier timeouts if this has already expired */
if (lifetime_timeout <= time_now)
if (r < 0)
return r;
- r = sd_event_source_set_name(client->timeout_t2,
- "dhcp4-t2-timeout");
+ 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));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC));
/* don't arm earlier timeout if this has already expired */
if (t2_timeout <= time_now)
if (r < 0)
return r;
- r = sd_event_source_set_name(client->timeout_t1,
- "dhcp4-t1-timer");
+ 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));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC));
return 0;
}
if (r < 0)
goto error;
- r = sd_event_source_set_name(client->timeout_resend,
- "dhcp4-resend-timer");
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
if (r < 0)
goto error;
} else if (r == -ENOMSG)
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 = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
+ else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE)
notify_event = r;
client->state = DHCP_STATE_BOUND;
client->last_addr = client->lease->address;
r = client_set_lease_timeouts(client);
- if (r < 0)
+ if (r < 0) {
+ log_dhcp_client(client, "could not set lease timeouts");
goto error;
+ }
r = dhcp_network_bind_udp_socket(client->lease->address,
DHCP_PORT_CLIENT);
expected_hlen = ETH_ALEN;
expected_chaddr = (const struct ether_addr *) &client->mac_addr;
} else {
- /* Non-ethernet links expect zero chaddr */
+ /* Non-Ethernet links expect zero chaddr */
expected_hlen = 0;
expected_chaddr = &zero_mac;
}
} else if ((size_t)len < sizeof(DHCPPacket))
return 0;
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ CMSG_FOREACH(cmsg, &msg) {
if (cmsg->cmsg_level == SOL_PACKET &&
cmsg->cmsg_type == PACKET_AUXDATA &&
cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
r = client_start(client);
if (r >= 0)
- log_dhcp_client(client, "STARTED on ifindex %u", client->index);
+ log_dhcp_client(client, "STARTED on ifindex %i", client->index);
return r;
}
assert_return(client, -EINVAL);
- client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
client->state = DHCP_STATE_STOPPED;
return 0;
}
sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) {
- if (client)
- assert_se(REFCNT_INC(client->n_ref) >= 2);
+
+ if (!client)
+ return NULL;
+
+ assert(client->n_ref >= 1);
+ client->n_ref++;
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);
+ if (!client)
+ return NULL;
- client->receive_message =
- sd_event_source_unref(client->receive_message);
+ assert(client->n_ref >= 1);
+ client->n_ref--;
- sd_dhcp_client_detach_event(client);
+ if (client->n_ref > 0)
+ return NULL;
- sd_dhcp_lease_unref(client->lease);
+ log_dhcp_client(client, "FREE");
- free(client->req_opts);
- free(client->hostname);
- free(client->vendor_class_identifier);
- free(client);
- }
+ 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;
}
if (!client)
return -ENOMEM;
- client->n_ref = REFCNT_INIT;
+ client->n_ref = 1;
client->state = DHCP_STATE_INIT;
client->index = -1;
client->fd = -1;
projects / thirdparty / systemd.git / blobdiff