WSAPROTOCOL_INFO

typedef struct _WSAPROTOCOL_INFOW { 

    DWORD dwServiceFlags1;

    DWORD dwServiceFlags2;

    DWORD dwServiceFlags3;

    DWORD dwServiceFlags4;

    DWORD dwProviderFlags;

    GUID ProviderId;

    DWORD dwCatalogEntryId;

    WSAPROTOCOLCHAIN ProtocolChain;

    int iVersion;

    int iAddressFamily;

    int iMaxSockAddr;

    int iMinSockAddr;

    int iSocketType;

    int iProtocol;

    int iProtocolMaxOffset;

    int iNetworkByteOrder;

    int iSecurityScheme;

    DWORD dwMessageSize;

    DWORD dwProviderReserved;

    WCHAR  szProtocol[WSAPROTOCOL_LEN+1];

} WSAPROTOCOL_INFOW, FAR * LPWSAPROTOCOL_INFOW;

Members

dwServiceFlags1

A bitmask describing the services provided by the protocol. The following values are possible:

XP1_CONNECTIONLESS

The protocol provides connectionless (datagram) service. If not set, the protocol supports connection-oriented data transfer.

XP1_GUARANTEED_DELIVERY

The protocol guarantees that all data sent will reach the intended destination.

XP1_GUARANTEED_ORDER

The protocol guarantees that data will only arrive in the order in which it was sent and that it will not be duplicated. This characteristic does not necessarily mean that the data will always be delivered, but that any data that is delivered is delivered in the order in which it was sent.

XP1_MESSAGE_ORIENTED

The protocol honors message boundaries, as opposed to a stream-oriented protocol where there is no concept of message boundaries.

XP1_PSEUDO_STREAM

This is a message oriented protocol, but message boundaries will be ignored for all receives. This is convenient when an application does not desire message framing to be done by the protocol.

XP1_GRACEFUL_CLOSE

The protocol supports two-phase (graceful) close. If not set, only abortive closes are performed.

XP1_EXPEDITED_DATA

The protocol supports expedited (urgent) data.

XP1_CONNECT_DATA

The protocol supports connect data.

XP1_DISCONNECT_DATA

The protocol supports disconnect data.

XP1_SUPPORT_BROADCAST

The protocol supports a broadcast mechanism.

XP1_SUPPORT_MULTIPOINT

The protocol supports a multipoint or multicast mechanism. Control and data plane attributes are indicated below. XP1_MULTIPOINT_CONTROL_PLANE

Indicates whether the control plane is rooted (value = 1) or non-rooted (value = 0).

XP1_MULTIPOINT_DATA_PLANE

Indicates whether the data plane is rooted (value = 1) or non-rooted (value = 0).

XP1_QOS_SUPPORTED

The protocol supports quality of service requests.

XP1_RESERVED

This bit is reserved.

XP1_UNI_SEND

The protocol is unidirectional in the send direction.

XP1_UNI_RECV

the protocol is unidirectional in the recv direction.

XP1_IFS_HANDLES

The socket descriptors returned by the provider are operating system Installable File System (IFS) handles.

XP1_PARTIAL_MESSAGE

The MSG_PARTIAL flag is supported in WSASend and WSASendTo.

Note that only one of XP1_UNI_SEND or XP1_UNI_RECV may be set. If a protocol can be unidirectional in either direction, two WSAPROTOCOL_INFO structs should be used. When neither bit is set, the protocol is considered to be bi-directional.

dwServiceFlags2

Reserved for additional protocol attribute definitions.

dwServiceFlags3

Reserved for additional protocol attribute definitions.

dwServiceFlags4

Reserved for additional protocol attribute definitions.

dwProviderFlags

Provide information about how this protocol is represented in the protocol catalog. The following flag values are possible:

PFL_MULTIPLE_PROTOCOL_ENTRIES

Indicates that this is one of two or more entries for a single protocol (from a given provider) which is capable of implementing multiple behaviors. An example of this is SPX which, on the receiving side, can behave either as a message oriented or a stream oriented protocol.

PFL_RECOMMENDED_PROTO_ENTRY

Indicates that this is the recommended or most frequently used entry for a protocol which is capable of implementing multiple behaviors.

PFL_HIDDEN

Set by a provider to indicate to the WS2_32.DLL that this protocol should not be returned in the result buffer generated by WSAEnumProtocols. Obviously, a Windows Sockets 2 application should never see an entry with this bit set.

PFL_MATCHES_PROTOCOL_ZERO

Indicates that a value of zero in the protocol parameter of socket or WSASocket matches this protocol entry.

ProviderId

A globally unique identifier assigned to the provider by the service provider vendor. This value is useful for instances where more than one service provider is able to implement a particular protocol. An application may use the dwProviderId value to distinguish between providers that might otherwise be indistinguishable.

dwCatalogEntryId

A unique identifier assigned by the WS2_32.DLL for each WSAPROTOCOL_INFO structure.

WSAPROTOCOLCHAINABNX23 ProtocolChain;

If the length of the chain is 0, this WSAPROTOCOL_INFO entry represents a layered protocol which has Windows Sockets 2 SPI as both its top and bottom edges. If the length of the chain equals 1, this entry represents a base protocol whose Catalog Entry ID is in the dwCatalogEntryId field of the WSAPROTOCOL_INFO structure. If the length of the chain is larger than 1, this entry represents a protocol chain which consists of one or more layered protocols on top of a base protocol. The corresponding Catalog Entry IDs are in the ProtocolChain.ChainEntries array starting with the layered protocol at the top (the zero element in the ProtocolChain.ChainEntries array) and ending with the base protocol. Refer to the Windows Sockets 2 Service Provider Interface specification for more information on protocol chains.

iVersion

Protocol version identifier.

iAddressFamily

The value to pass as the address family parameter to the socket/WSASocket function in order to open a socket for this protocol. This value also uniquely defines the structure of protocol addresses (SOCKADDRs) used by the protocol.

iMaxSockAddr

The maximum address length.

iMinSockAddr

The minimum address length.

iSocketType

The value to pass as the socket type parameter to the socket function in order to open a socket for this protocol.

iProtocol

The value to pass as the protocol parameter to the socket function in order to open a socket for this protocol.

iProtocolMaxOffset

The maximum value that may be added to iProtocol when supplying a value for the protocol parameter to socket and WSASocket. Not all protocols allow a range of values. When this is the case iProtocolMaxOffset will be zero.

iNetworkByteOrder

Currently these values are manifest constants (BIGENDIAN and LITTLEENDIAN) that indicate either  big-endian  or  little-endian  with the values 0 and 1 respectively.

iSecurityScheme

Indicates the type of security scheme employed (if any). A value of SECURITY_PROTOCOL_NONE is used for protocols that do not incorporate security provisions.

dwMessageSize

The maximum message size supported by the protocol. This is the maximum size that can be sent from any of the host s local interfaces. For protocols which do not support message framing, the actual maximum that can be sent to a given address may be less. The following special values are defined:

0

The protocol is stream-oriented and hence the concept of message size is not relevant.

0x1

The maximum message size is dependent on the underlying network MTU (maximum sized transmission unit) and hence cannot be known until after a socket is bound. Applications should use getsockopt to retrieve the value of SO_MAX_MSG_SIZE after the socket has been bound to a local address.

0xFFFFFFFF

The protocol is message-oriented, but there is no maximum limit to the size of messages that may be transmitted.

dwProviderReserved

Reserved for use by service providers.

szProtocol

An array of characters that contains a human-readable name identifying the protocol, for example "SPX2". The maximum number of characters allowed is WSAPROTOCOL_LEN, which is defined to be 255.