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-rw-r--r--src/libsystemd-network/sd-dhcp-client.c117
-rw-r--r--src/systemd/sd-dhcp-client.h4
2 files changed, 109 insertions, 12 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 2906f2cb3a..8503f19c27 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -38,6 +38,7 @@
#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 {
@@ -56,13 +57,33 @@ 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;
@@ -200,8 +221,70 @@ int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr,
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);
@@ -378,14 +461,24 @@ static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret,
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
diff --git a/src/systemd/sd-dhcp-client.h b/src/systemd/sd-dhcp-client.h
index 7416f82193..951662e56c 100644
--- a/src/systemd/sd-dhcp-client.h
+++ b/src/systemd/sd-dhcp-client.h
@@ -51,6 +51,10 @@ int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast);
int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index);
int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr,
size_t addr_len, uint16_t arp_type);
+int sd_dhcp_client_set_client_id(sd_dhcp_client *client, uint8_t type,
+ const uint8_t *data, size_t data_len);
+int sd_dhcp_client_get_client_id(sd_dhcp_client *client, uint8_t *type,
+ const uint8_t **data, size_t *data_len);
int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu);
int sd_dhcp_client_set_hostname(sd_dhcp_client *client, const char *hostname);
int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, const char *vci);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-24 21:40:50 +0000