#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 {
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;
+ 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;
- uint16_t secs;
unsigned int attempt;
usec_t request_sent;
sd_event_source *timeout_t1;
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.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);
_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 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 */
- 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.raw);
+ if (r < 0)
+ return r;
+ }
/* RFC2131 section 3.5:
in its initial DHCPDISCOVER or DHCPREQUEST message, a
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)
}
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);
}
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");
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");
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);
~ianmdlvl / elogind.git / blobdiff