diff --git a/include/dhcpcsdk.h b/include/dhcpcsdk.h
index 93c7af6e083..8f96a8212d4 100644
--- a/include/dhcpcsdk.h
+++ b/include/dhcpcsdk.h
@@ -18,6 +18,75 @@
 #ifndef _DHCPCSDK_
 #define _DHCPCSDK_
 
+#define OPTION_PAD                      0
+#define OPTION_SUBNET_MASK              1
+#define OPTION_TIME_OFFSET              2
+#define OPTION_ROUTER_ADDRESS           3
+#define OPTION_TIME_SERVERS             4
+#define OPTION_IEN116_NAME_SERVERS      5
+#define OPTION_DOMAIN_NAME_SERVERS      6
+#define OPTION_LOG_SERVERS              7
+#define OPTION_COOKIE_SERVERS           8
+#define OPTION_LPR_SERVERS              9
+#define OPTION_IMPRESS_SERVERS          10
+#define OPTION_RLP_SERVERS              11
+#define OPTION_HOST_NAME                12
+#define OPTION_BOOT_FILE_SIZE           13
+#define OPTION_MERIT_DUMP_FILE          14
+#define OPTION_DOMAIN_NAME              15
+#define OPTION_SWAP_SERVER              16
+#define OPTION_ROOT_DISK                17
+#define OPTION_EXTENSIONS_PATH          18
+#define OPTION_BE_A_ROUTER              19
+#define OPTION_NON_LOCAL_SOURCE_ROUTING 20
+#define OPTION_POLICY_FILTER_FOR_NLSR   21
+#define OPTION_MAX_REASSEMBLY_SIZE      22
+#define OPTION_DEFAULT_TTL              23
+#define OPTION_PMTU_AGING_TIMEOUT       24
+#define OPTION_PMTU_PLATEAU_TABLE       25
+#define OPTION_MTU                      26
+#define OPTION_ALL_SUBNETS_MTU          27
+#define OPTION_BROADCAST_ADDRESS        28
+#define OPTION_PERFORM_MASK_DISCOVERY   29
+#define OPTION_BE_A_MASK_SUPPLIER       30
+#define OPTION_PERFORM_ROUTER_DISCOVERY 31
+#define OPTION_ROUTER_SOLICITATION_ADDR 32
+#define OPTION_STATIC_ROUTES            33
+#define OPTION_TRAILERS                 34
+#define OPTION_ARP_CACHE_TIMEOUT        35
+#define OPTION_ETHERNET_ENCAPSULATION   36
+#define OPTION_TTL                      37
+#define OPTION_KEEP_ALIVE_INTERVAL      38
+#define OPTION_KEEP_ALIVE_DATA_SIZE     39
+#define OPTION_NETWORK_INFO_SERVICE_DOM 40
+#define OPTION_NETWORK_INFO_SERVERS     41
+#define OPTION_NETWORK_TIME_SERVERS     42
+#define OPTION_VENDOR_SPEC_INFO         43
+#define OPTION_NETBIOS_NAME_SERVER      44
+#define OPTION_NETBIOS_DATAGRAM_SERVER  45
+#define OPTION_NETBIOS_NODE_TYPE        46
+#define OPTION_NETBIOS_SCOPE_OPTION     47
+#define OPTION_XWINDOW_FONT_SERVER      48
+#define OPTION_XWINDOW_DISPLAY_MANAGER  49
+#define OPTION_REQUESTED_ADDRESS        50
+#define OPTION_LEASE_TIME               51
+#define OPTION_OK_TO_OVERLAY            52
+#define OPTION_MESSAGE_TYPE             53
+#define OPTION_SERVER_IDENTIFIER        54
+#define OPTION_PARAMETER_REQUEST_LIST   55
+#define OPTION_MESSAGE                  56
+#define OPTION_MESSAGE_LENGTH           57
+#define OPTION_RENEWAL_TIME             58
+#define OPTION_REBIND_TIME              59
+#define OPTION_CLIENT_CLASS_INFO        60
+#define OPTION_CLIENT_ID                61
+
+#define OPTION_TFTP_SERVER_NAME         66
+#define OPTION_BOOTFILE_NAME            67
+
+#define OPTION_MSFT_IE_PROXY            252
+#define OPTION_END                      255
+
 typedef struct _DHCPAPI_PARAMS
 {
     ULONG  Flags;
@@ -42,9 +111,15 @@ typedef struct _DHCPCAPI_CLASSID
     ULONG  nBytesData;
 } DHCPCAPI_CLASSID, *PDHCPCAPI_CLASSID, *LPDHCPCAPI_CLASSID;
 
+#define DHCPCAPI_REQUEST_PERSISTENT   0x1
+#define DHCPCAPI_REQUEST_SYNCHRONOUS  0x2
+#define DHCPCAPI_REQUEST_ASYNCHRONOUS 0x4
+#define DHCPCAPI_REQUEST_CANCEL       0x8
+#define DHCPCAPI_REQUEST_MASK         0xf
 
-DWORD WINAPI DhcpRequestParams( DWORD flags, void *reserved, WCHAR *adaptername, DHCPCAPI_CLASSID *classid,
-                                DHCPCAPI_PARAMS_ARRAY sendparams, DHCPCAPI_PARAMS_ARRAY recdparams,
-                                BYTE *buffer, DWORD *size, WCHAR *requestidstr );
+void WINAPI DhcpCApiCleanup(void);
+DWORD WINAPI DhcpCApiInitialize(DWORD *);
+DWORD WINAPI DhcpRequestParams(DWORD, void *, WCHAR *, DHCPCAPI_CLASSID *, DHCPCAPI_PARAMS_ARRAY,
+                               DHCPCAPI_PARAMS_ARRAY, BYTE *, DWORD *, WCHAR *);
 
 #endif