diff --git a/src/dhcp-manager/systemd-dhcp/src/libsystemd-network/sd-dhcp-client.c b/src/dhcp-manager/systemd-dhcp/src/libsystemd-network/sd-dhcp-client.c index 0eba4c379d..32476ece2d 100644 --- a/src/dhcp-manager/systemd-dhcp/src/libsystemd-network/sd-dhcp-client.c +++ b/src/dhcp-manager/systemd-dhcp/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 32 #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; @@ -201,8 +222,65 @@ 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; +} + +const uint8_t *sd_dhcp_client_get_client_id(sd_dhcp_client *client, + uint8_t *type, + size_t *len) { + + assert_return(client, NULL); + assert_return(type, NULL); + assert_return(len, NULL); + + if (!client->client_id_len) + return NULL; + + *type = client->client_id.raw.type; + *len = client->client_id_len - 1; /* -1 for sizeof(type) */ + return (const uint8_t *) &client->client_id.raw.data; +} + +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 + 1 && + 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 + 1; /* +1 for sizeof(type) */ if (need_restart && client->state != DHCP_STATE_STOPPED) sd_dhcp_client_start(client); @@ -369,14 +447,24 @@ 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/dhcp-manager/systemd-dhcp/src/systemd/sd-dhcp-client.h b/src/dhcp-manager/systemd-dhcp/src/systemd/sd-dhcp-client.h index 7416f82193..953f6cddef 100644 --- a/src/dhcp-manager/systemd-dhcp/src/systemd/sd-dhcp-client.h +++ b/src/dhcp-manager/systemd-dhcp/src/systemd/sd-dhcp-client.h @@ -51,6 +51,11 @@ 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); +const uint8_t *sd_dhcp_client_get_client_id(sd_dhcp_client *client, + uint8_t *type, + size_t *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);