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dhcp-protocol: introduce several constants, string table lookups, and so on (#41710)

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This commit is contained in:
Yu Watanabe
2026-04-24 03:54:55 +09:00
committed by GitHub
parent 785c9301de 06188d2663
commit 7aa8eabc8e
5 changed files with 247 additions and 35 deletions
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src/libsystemd-network/dhcp-protocol.c
+190
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@@ -0,0 +1,190 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dhcp-protocol.h"
#include "string-table.h"
static const char * const bootp_message_type_table[_BOOTP_MESSAGE_TYPE_MAX] = {
[BOOTREQUEST] = "BOOTREQUEST",
[BOOTREPLY] = "BOOTREPLY",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(bootp_message_type, BOOTPMessageType);
static const char * const dhcp_message_type_table[_DHCP_MESSAGE_TYPE_MAX] = {
[DHCP_DISCOVER] = "DISCOVER",
[DHCP_OFFER] = "OFFER",
[DHCP_REQUEST] = "REQUEST",
[DHCP_DECLINE] = "DECLINE",
[DHCP_ACK] = "ACK",
[DHCP_NAK] = "NAK",
[DHCP_RELEASE] = "RELEASE",
[DHCP_INFORM] = "INFORM",
[DHCP_FORCERENEW] = "FORCERENEW",
[DHCP_LEASEQUERY] = "LEASEQUERY",
[DHCP_LEASEUNASSIGNED] = "LEASEUNASSIGNED",
[DHCP_LEASEUNKNOWN] = "LEASEUNKNOWN",
[DHCP_LEASEACTIVE] = "LEASEACTIVE",
[DHCP_BULKLEASEQUERY] = "BULKLEASEQUERY",
[DHCP_LEASEQUERYDONE] = "LEASEQUERYDONE",
[DHCP_ACTIVELEASEQUERY] = "ACTIVELEASEQUERY",
[DHCP_LEASEQUERYSTATUS] = "LEASEQUERYSTATUS",
[DHCP_TLS] = "TLS",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(dhcp_message_type, DHCPMessageType);
static const char * const dhcp_option_code_table[] = {
[SD_DHCP_OPTION_PAD] = "pad",
[SD_DHCP_OPTION_SUBNET_MASK] = "subnet mask",
[SD_DHCP_OPTION_TIME_OFFSET] = "time offset",
[SD_DHCP_OPTION_ROUTER] = "router",
[SD_DHCP_OPTION_TIME_SERVER] = "time server",
[SD_DHCP_OPTION_NAME_SERVER] = "name server",
[SD_DHCP_OPTION_DOMAIN_NAME_SERVER] = "domain name server",
[SD_DHCP_OPTION_LOG_SERVER] = "log server",
[SD_DHCP_OPTION_QUOTES_SERVER] = "quotes server",
[SD_DHCP_OPTION_LPR_SERVER] = "LPR server",
[SD_DHCP_OPTION_IMPRESS_SERVER] = "impress server",
[SD_DHCP_OPTION_RLP_SERVER] = "RLP server",
[SD_DHCP_OPTION_HOST_NAME] = "hostname",
[SD_DHCP_OPTION_BOOT_FILE_SIZE] = "boot file size",
[SD_DHCP_OPTION_MERIT_DUMP_FILE] = "merit dump file",
[SD_DHCP_OPTION_DOMAIN_NAME] = "domain name",
[SD_DHCP_OPTION_SWAP_SERVER] = "swap server",
[SD_DHCP_OPTION_ROOT_PATH] = "root path",
[SD_DHCP_OPTION_EXTENSION_FILE] = "extension file",
[SD_DHCP_OPTION_FORWARD] = "IP forwarding",
[SD_DHCP_OPTION_SOURCE_ROUTE] = "source routing",
[SD_DHCP_OPTION_POLICY_FILTER] = "policy filter",
[SD_DHCP_OPTION_MAX_DATAGRAM_ASSEMBLY] = "max datagram assembly",
[SD_DHCP_OPTION_DEFAULT_IP_TTL] = "default IP TTL",
[SD_DHCP_OPTION_MTU_TIMEOUT] = "MTU timeout",
[SD_DHCP_OPTION_MTU_PLATEAU] = "MTU plateau",
[SD_DHCP_OPTION_MTU_INTERFACE] = "MTU size",
[SD_DHCP_OPTION_MTU_SUBNET] = "MTU subnet",
[SD_DHCP_OPTION_BROADCAST] = "broadcast address",
[SD_DHCP_OPTION_MASK_DISCOVERY] = "mask discovery",
[SD_DHCP_OPTION_MASK_SUPPLIER] = "mask supplier",
[SD_DHCP_OPTION_ROUTER_DISCOVERY] = "router discovery",
[SD_DHCP_OPTION_ROUTER_REQUEST] = "router request",
[SD_DHCP_OPTION_STATIC_ROUTE] = "static route",
[SD_DHCP_OPTION_TRAILERS] = "trailers",
[SD_DHCP_OPTION_ARP_TIMEOUT] = "ARP timeout",
[SD_DHCP_OPTION_ETHERNET] = "Ethernet encapsulation",
[SD_DHCP_OPTION_DEFAULT_TCP_TTL] = "default TCP TTL",
[SD_DHCP_OPTION_KEEPALIVE_TIME] = "keepalive time",
[SD_DHCP_OPTION_KEEPALIVE_DATA] = "keepalive data",
[SD_DHCP_OPTION_NIS_DOMAIN] = "NIS domain",
[SD_DHCP_OPTION_NIS_SERVER] = "NIS server",
[SD_DHCP_OPTION_NTP_SERVER] = "NTP server",
[SD_DHCP_OPTION_VENDOR_SPECIFIC] = "vendor specific",
[SD_DHCP_OPTION_NETBIOS_NAME_SERVER] = "NETBIOS name server",
[SD_DHCP_OPTION_NETBIOS_DIST_SERVER] = "NETBIOS distribution server",
[SD_DHCP_OPTION_NETBIOS_NODE_TYPE] = "NETBIOS node type",
[SD_DHCP_OPTION_NETBIOS_SCOPE] = "NETBIOS scope",
[SD_DHCP_OPTION_X_WINDOW_FONT] = "X Window font",
[SD_DHCP_OPTION_X_WINDOW_MANAGER] = "X Window manager",
[SD_DHCP_OPTION_REQUESTED_IP_ADDRESS] = "requested IP address",
[SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME] = "lease time",
[SD_DHCP_OPTION_OVERLOAD] = "overload",
[SD_DHCP_OPTION_MESSAGE_TYPE] = "message type",
[SD_DHCP_OPTION_SERVER_IDENTIFIER] = "server identifier",
[SD_DHCP_OPTION_PARAMETER_REQUEST_LIST] = "parameter request list",
[SD_DHCP_OPTION_ERROR_MESSAGE] = "error message",
[SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE] = "max message size",
[SD_DHCP_OPTION_RENEWAL_TIME] = "renewal time",
[SD_DHCP_OPTION_REBINDING_TIME] = "rebinding time",
[SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER] = "vendor class identifier",
[SD_DHCP_OPTION_CLIENT_IDENTIFIER] = "client identifier",
[SD_DHCP_OPTION_NETWARE_IP_DOMAIN] = "NetWare IP domain",
[SD_DHCP_OPTION_NETWARE_IP_OPTION] = "NetWare IP option",
[SD_DHCP_OPTION_NIS_DOMAIN_NAME] = "NIS+ v3 domain",
[SD_DHCP_OPTION_NIS_SERVER_ADDR] = "NIS+ v3 server",
[SD_DHCP_OPTION_BOOT_SERVER_NAME] = "TFTP server name",
[SD_DHCP_OPTION_BOOT_FILENAME] = "boot file name",
[SD_DHCP_OPTION_HOME_AGENT_ADDRESS] = "home agent address",
[SD_DHCP_OPTION_SMTP_SERVER] = "SMTP server",
[SD_DHCP_OPTION_POP3_SERVER] = "POP3 server",
[SD_DHCP_OPTION_NNTP_SERVER] = "NNTP server",
[SD_DHCP_OPTION_WWW_SERVER] = "WWW server",
[SD_DHCP_OPTION_FINGER_SERVER] = "finger server",
[SD_DHCP_OPTION_IRC_SERVER] = "IRC server",
[SD_DHCP_OPTION_STREETTALK_SERVER] = "StreetTalk server",
[SD_DHCP_OPTION_STDA_SERVER] = "STDA server",
[SD_DHCP_OPTION_USER_CLASS] = "user class",
[SD_DHCP_OPTION_DIRECTORY_AGENT] = "directory agent",
[SD_DHCP_OPTION_SERVICE_SCOPE] = "service scope",
[SD_DHCP_OPTION_RAPID_COMMIT] = "rapid commit",
[SD_DHCP_OPTION_FQDN] = "FQDN",
[SD_DHCP_OPTION_RELAY_AGENT_INFORMATION] = "relay agent information",
[SD_DHCP_OPTION_ISNS] = "iSNS",
[SD_DHCP_OPTION_NDS_SERVER] = "NDS server",
[SD_DHCP_OPTION_NDS_TREE_NAME] = "NDS tree name",
[SD_DHCP_OPTION_NDS_CONTEXT] = "NDS context",
[SD_DHCP_OPTION_BCMCS_CONTROLLER_DOMAIN_NAME] = "BCMCS controller domain name",
[SD_DHCP_OPTION_BCMCS_CONTROLLER_ADDRESS] = "BCMCS controller address",
[SD_DHCP_OPTION_AUTHENTICATION] = "authentication",
[SD_DHCP_OPTION_CLIENT_LAST_TRANSACTION_TIME] = "client last transaction time",
[SD_DHCP_OPTION_ASSOCIATED_IP] = "associated IP",
[SD_DHCP_OPTION_CLIENT_SYSTEM] = "client system",
[SD_DHCP_OPTION_CLIENT_NDI] = "client NDI",
[SD_DHCP_OPTION_LDAP] = "LDAP",
[SD_DHCP_OPTION_UUID] = "UUID",
[SD_DHCP_OPTION_USER_AUTHENTICATION] = "user authentication",
[SD_DHCP_OPTION_GEOCONF_CIVIC] = "geoconf civic",
[SD_DHCP_OPTION_POSIX_TIMEZONE] = "posix timezone",
[SD_DHCP_OPTION_TZDB_TIMEZONE] = "tzdb timezone",
[SD_DHCP_OPTION_IPV6_ONLY_PREFERRED] = "IPv6-only preferred",
[SD_DHCP_OPTION_DHCP4O6_SOURCE_ADDRESS] = "DHCPv4 over DHCPv6 source address",
[SD_DHCP_OPTION_NETINFO_ADDRESS] = "Netinfo address",
[SD_DHCP_OPTION_NETINFO_TAG] = "Netinfo tag",
[SD_DHCP_OPTION_DHCP_CAPTIVE_PORTAL] = "captive portal",
[SD_DHCP_OPTION_AUTO_CONFIG] = "auto config",
[SD_DHCP_OPTION_NAME_SERVICE_SEARCH] = "name service search",
[SD_DHCP_OPTION_SUBNET_SELECTION] = "subnet selection",
[SD_DHCP_OPTION_DOMAIN_SEARCH] = "domain search",
[SD_DHCP_OPTION_SIP_SERVER] = "SIP server",
[SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE] = "classless static route",
[SD_DHCP_OPTION_CABLELABS_CLIENT_CONFIGURATION] = "CableLabs client configuration",
[SD_DHCP_OPTION_GEOCONF] = "geoconf",
[SD_DHCP_OPTION_VENDOR_CLASS] = "vendor class",
[SD_DHCP_OPTION_VENDOR_SPECIFIC_INFORMATION] = "vendor specific information",
[SD_DHCP_OPTION_PANA_AGENT] = "PANA agent",
[SD_DHCP_OPTION_LOST_SERVER_FQDN] = "LoST server",
[SD_DHCP_OPTION_CAPWAP_AC_ADDRESS] = "CAPWAP access controller address",
[SD_DHCP_OPTION_MOS_ADDRESS] = "MoS address",
[SD_DHCP_OPTION_MOS_FQDN] = "MoS FQDN",
[SD_DHCP_OPTION_SIP_SERVICE_DOMAIN] = "SIP service domain",
[SD_DHCP_OPTION_ANDSF_ADDRESS] = "ANDSF address",
[SD_DHCP_OPTION_SZTP_REDIRECT] = "SZTP server",
[SD_DHCP_OPTION_GEOLOC] = "geospatial location",
[SD_DHCP_OPTION_FORCERENEW_NONCE_CAPABLE] = "forcerenew nonce capable",
[SD_DHCP_OPTION_RDNSS_SELECTION] = "RDNSS selection",
[SD_DHCP_OPTION_DOTS_RI] = "DOTS agent name",
[SD_DHCP_OPTION_DOTS_ADDRESS] = "DOTS agent address",
[SD_DHCP_OPTION_TFTP_SERVER_ADDRESS] = "TFTP server address",
[SD_DHCP_OPTION_STATUS_CODE] = "status code",
[SD_DHCP_OPTION_BASE_TIME] = "base time",
[SD_DHCP_OPTION_START_TIME_OF_STATE] = "start time of state",
[SD_DHCP_OPTION_QUERY_START_TIME] = "query start time",
[SD_DHCP_OPTION_QUERY_END_TIME] = "query end time",
[SD_DHCP_OPTION_DHCP_STATE] = "DHCP state",
[SD_DHCP_OPTION_DATA_SOURCE] = "data source",
[SD_DHCP_OPTION_PCP_SERVER] = "PCP server",
[SD_DHCP_OPTION_PORT_PARAMS] = "port parameter",
[SD_DHCP_OPTION_MUD_URL] = "MUD URL",
[SD_DHCP_OPTION_V4_DNR] = "encrypted DNS server",
[SD_DHCP_OPTION_PXELINUX_MAGIC] = "PXELinux magic",
[SD_DHCP_OPTION_CONFIGURATION_FILE] = "configuration file",
[SD_DHCP_OPTION_PATH_PREFIX] = "path prefix",
[SD_DHCP_OPTION_REBOOT_TIME] = "reboot time",
[SD_DHCP_OPTION_6RD] = "6rd",
[SD_DHCP_OPTION_ACCESS_DOMAIN] = "access network domain",
[SD_DHCP_OPTION_SUBNET_ALLOCATION] = "subnet allocation",
[SD_DHCP_OPTION_VIRTUAL_SUBNET_SELECTION] = "virtual subnet selection",
[SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE] = "(private) classless static route",
[SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY] = "(private) proxy autodiscovery",
[SD_DHCP_OPTION_END] = "end",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(dhcp_option_code, int);
src/libsystemd-network/dhcp-protocol.h
+41 -18
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@@ -8,7 +8,7 @@
#include <netinet/ip.h>
#include <netinet/udp.h>
#include "sd-dhcp-protocol.h"
#include "sd-dhcp-protocol.h" /* IWYU pragma: export */
#include "sd-forward.h"
#include "sparse-endian.h"
@@ -35,12 +35,19 @@
uint8_t file[128]; \
be32_t magic;
struct DHCPMessageHeader {
DHCP_MESSAGE_HEADER_DEFINITION;
} _packed_;
typedef struct DHCPMessageHeader DHCPMessageHeader;
struct DHCPMessage {
DHCP_MESSAGE_HEADER_DEFINITION;
uint8_t options[];
} _packed_;
typedef struct DHCPMessage DHCPMessage;
assert_cc(sizeof(DHCPMessageHeader) == offsetof(DHCPMessage, options));
struct DHCPPacket {
struct iphdr ip;
@@ -58,17 +65,25 @@ typedef struct DHCPPacket DHCPPacket;
#define DHCP_MIN_PACKET_SIZE (DHCP_MIN_MESSAGE_SIZE + DHCP_IP_UDP_SIZE)
#define DHCP_MAGIC_COOKIE (uint32_t)(0x63825363)
/* The size of BOOTP message. The BOOTP message does not have the magic field, but has the 64-byte
* vendor-specific area. */
#define BOOTP_MESSAGE_SIZE (offsetof(DHCPMessageHeader, magic) + 64)
enum {
DHCP_PORT_SERVER = 67,
DHCP_PORT_CLIENT = 68,
};
enum {
typedef enum {
BOOTREQUEST = 1,
BOOTREPLY = 2,
};
_BOOTP_MESSAGE_TYPE_MAX,
_BOOTP_MESSAGE_TYPE_INVALID = -EINVAL,
} BOOTPMessageType;
enum {
DECLARE_STRING_TABLE_LOOKUP_TO_STRING(bootp_message_type, BOOTPMessageType);
typedef enum {
DHCP_DISCOVER = 1, /* [RFC2132] */
DHCP_OFFER = 2, /* [RFC2132] */
DHCP_REQUEST = 3, /* [RFC2132] */
@@ -78,21 +93,27 @@ enum {
DHCP_RELEASE = 7, /* [RFC2132] */
DHCP_INFORM = 8, /* [RFC2132] */
DHCP_FORCERENEW = 9, /* [RFC3203] */
DHCPLEASEQUERY = 10, /* [RFC4388] */
DHCPLEASEUNASSIGNED = 11, /* [RFC4388] */
DHCPLEASEUNKNOWN = 12, /* [RFC4388] */
DHCPLEASEACTIVE = 13, /* [RFC4388] */
DHCPBULKLEASEQUERY = 14, /* [RFC6926] */
DHCPLEASEQUERYDONE = 15, /* [RFC6926] */
DHCPACTIVELEASEQUERY = 16, /* [RFC7724] */
DHCPLEASEQUERYSTATUS = 17, /* [RFC7724] */
DHCPTLS = 18, /* [RFC7724] */
};
DHCP_LEASEQUERY = 10, /* [RFC4388] */
DHCP_LEASEUNASSIGNED = 11, /* [RFC4388] */
DHCP_LEASEUNKNOWN = 12, /* [RFC4388] */
DHCP_LEASEACTIVE = 13, /* [RFC4388] */
DHCP_BULKLEASEQUERY = 14, /* [RFC6926] */
DHCP_LEASEQUERYDONE = 15, /* [RFC6926] */
DHCP_ACTIVELEASEQUERY = 16, /* [RFC7724] */
DHCP_LEASEQUERYSTATUS = 17, /* [RFC7724] */
DHCP_TLS = 18, /* [RFC7724] */
_DHCP_MESSAGE_TYPE_MAX,
_DHCP_MESSAGE_TYPE_INVALID = -EINVAL,
} DHCPMessageType;
enum {
DHCP_OVERLOAD_FILE = 1,
DHCP_OVERLOAD_SNAME = 2,
};
DECLARE_STRING_TABLE_LOOKUP_TO_STRING(dhcp_message_type, DHCPMessageType);
typedef enum {
DHCP_OVERLOAD_NONE = 0,
DHCP_OVERLOAD_FILE = 1 << 0,
DHCP_OVERLOAD_SNAME = 1 << 1,
_DHCP_OVERLOAD_ALL = DHCP_OVERLOAD_FILE | DHCP_OVERLOAD_SNAME,
} DHCPOptionOverload;
#define DHCP_MAX_FQDN_LENGTH 255
@@ -102,3 +123,5 @@ enum {
DHCP_FQDN_FLAG_E = (1 << 2),
DHCP_FQDN_FLAG_N = (1 << 3),
};
DECLARE_STRING_TABLE_LOOKUP_TO_STRING(dhcp_option_code, int);
src/libsystemd-network/meson.build
+1
View File
@@ -5,6 +5,7 @@ libsystemd_network_sources = files(
'dhcp-network.c',
'dhcp-option.c',
'dhcp-packet.c',
'dhcp-protocol.c',
'dhcp6-network.c',
'dhcp6-option.c',
'dhcp6-protocol.c',
src/libsystemd-network/test-dhcp-server.c
+14 -16
View File
@@ -83,9 +83,7 @@ static int test_basic(bool bind_to_interface) {
static void test_message_handler(void) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
struct {
struct {
DHCP_MESSAGE_HEADER_DEFINITION;
} _packed_ message;
DHCPMessageHeader header;
struct {
uint8_t code;
uint8_t length;
@@ -113,11 +111,11 @@ static void test_message_handler(void) {
} _packed_ option_hostname;
uint8_t end;
} _packed_ test = {
.message.op = BOOTREQUEST,
.message.htype = ARPHRD_ETHER,
.message.hlen = ETHER_ADDR_LEN,
.message.xid = htobe32(0x12345678),
.message.chaddr = { 'A', 'B', 'C', 'D', 'E', 'F' },
.header.op = BOOTREQUEST,
.header.htype = ARPHRD_ETHER,
.header.hlen = ETHER_ADDR_LEN,
.header.xid = htobe32(0x12345678),
.header.chaddr = { 'A', 'B', 'C', 'D', 'E', 'F' },
.option_type.code = SD_DHCP_OPTION_MESSAGE_TYPE,
.option_type.length = 1,
.option_type.type = DHCP_DISCOVER,
@@ -168,19 +166,19 @@ static void test_message_handler(void) {
test.option_type.type = DHCP_DISCOVER;
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_OFFER);
test.message.op = 0;
test.header.op = 0;
ASSERT_OK_ZERO(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL));
test.message.op = BOOTREQUEST;
test.header.op = BOOTREQUEST;
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_OFFER);
test.message.htype = 0;
test.header.htype = 0;
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_OFFER);
test.message.htype = ARPHRD_ETHER;
test.header.htype = ARPHRD_ETHER;
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_OFFER);
test.message.hlen = 0;
test.header.hlen = 0;
ASSERT_ERROR(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), EBADMSG);
test.message.hlen = ETHER_ADDR_LEN;
test.header.hlen = ETHER_ADDR_LEN;
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_OFFER);
test.option_type.type = DHCP_REQUEST;
@@ -246,7 +244,7 @@ static void test_message_handler(void) {
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_ACK);
/* release the bound static lease */
test.message.ciaddr = htobe32(INADDR_LOOPBACK + 31);
test.header.ciaddr = htobe32(INADDR_LOOPBACK + 31);
test.option_type.type = DHCP_RELEASE;
ASSERT_OK_ZERO(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL));
@@ -261,7 +259,7 @@ static void test_message_handler(void) {
ASSERT_OK(sd_dhcp_server_start(server));
/* request a new non-static address */
test.message.ciaddr = 0;
test.header.ciaddr = 0;
test.option_type.type = DHCP_REQUEST;
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 29);
ASSERT_OK_EQ(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test), NULL), DHCP_ACK);
src/systemd/sd-dhcp-protocol.h
+1 -1
View File
@@ -91,7 +91,7 @@ enum {
SD_DHCP_OPTION_NIS_SERVER_ADDR = 65, /* [RFC2132] */
SD_DHCP_OPTION_BOOT_SERVER_NAME = 66, /* [RFC2132] */
SD_DHCP_OPTION_BOOT_FILENAME = 67, /* [RFC2132] */
SD_DHCP_OPTION_HOME_AGENT_ADDRESSES = 68, /* [RFC2132] */
SD_DHCP_OPTION_HOME_AGENT_ADDRESS = 68, /* [RFC2132] */
SD_DHCP_OPTION_SMTP_SERVER = 69, /* [RFC2132] */
SD_DHCP_OPTION_POP3_SERVER = 70, /* [RFC2132] */
SD_DHCP_OPTION_NNTP_SERVER = 71, /* [RFC2132] */