diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-client.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp-client.c | 117 |
1 files changed, 105 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 |