NAME

       globus_gram_protocol_io - Mesage I/O.

SYNOPSIS

   Typedefs
       typedef unsigned long globus_gram_protocol_handle_t
           Unique GRAM protocol identifier.
       typedef struct globus_gram_protocol_hash_entry_s globus_gram_protocol_extension_t
           GRAM protocol extension attribute-value pair.

   Functions
       int globus_gram_protocol_setup_attr (globus_io_attr_t *attr)
           Create default I/O attribute for GRAM.
       globus_bool_t globus_gram_protocol_authorize_self (gss_ctx_id_t context)
           Determine if a GSSAPI context has the same source and target identities.
       int globus_gram_protocol_allow_attach (char **url, globus_gram_protocol_callback_t callback, void
           *callback_arg)
           Create a GRAM protocol service listener.
       int globus_gram_protocol_callback_disallow (char *url)
           Stop a GASS protocol listener from handling new requests.
       int globus_gram_protocol_post (const char *url, globus_gram_protocol_handle_t *handle, globus_io_attr_t
           *attr, globus_byte_t *message, globus_size_t message_size, globus_gram_protocol_callback_t callback,
           void *callback_arg)
           Post a GRAM protocol request to a GRAM server.
       int globus_gram_protocol_post_delegation (const char *url, globus_gram_protocol_handle_t *handle,
           globus_io_attr_t *attr, globus_byte_t *message, globus_size_t message_size, gss_cred_id_t
           cred_handle, gss_OID_set restriction_oids, gss_buffer_set_t restriction_buffers, OM_uint32 req_flags,
           OM_uint32 time_req, globus_gram_protocol_callback_t callback, void *callback_arg)
           Post a GRAM protocol delegation request to a GRAM server.
       int globus_gram_protocol_reply (globus_gram_protocol_handle_t handle, int code, globus_byte_t *message,
           globus_size_t message_size)
           Reply to a GRAM protocol message.
       int globus_gram_protocol_accept_delegation (globus_gram_protocol_handle_t handle, gss_OID_set
           restriction_oids, gss_buffer_set_t restriction_buffers, OM_uint32 req_flags, OM_uint32 time_req,
           globus_gram_protocol_delegation_callback_t callback, void *arg)
           Perform the server-side of the GSSAPI delegation handshake to receive a new delegated credential.
       int globus_gram_protocol_get_sec_context (globus_gram_protocol_handle_t handle, gss_ctx_id_t *context)
           Get a reference to the GSSAPI security context associated with a GRAM protocol handle.

Detailed Description

       Mesage I/O.

       The functions in this section are related to sending and receiving GRAM protocol messages.

Typedef Documentation

   globus_gram_protocol_extension_t
       GRAM protocol extension attribute-value pair. The globus_gram_protocol_extension_t data type contains an
       attribute value pair that represents an extension to the GRAM2 protocol.

   globus_gram_protocol_handle_t
       Unique GRAM protocol identifier. The globus_gram_protocol_handle_t data type is used by functions in the
       GRAM protocol API as a unique discriminant between instances of a callback invocation.

       There are no public functions that operate on these handles. They are used as identifiers for callback
       functions.

Function Documentation

   int globus_gram_protocol_accept_delegation (globus_gram_protocol_handle_t handle, gss_OID_set
       restriction_oids, gss_buffer_set_t restriction_buffers, OM_uint32 req_flags, OM_uint32 time_req,
       globus_gram_protocol_delegation_callback_t callback, void * arg)
       Perform the server-side of the GSSAPI delegation handshake to receive a new delegated credential. The
       globus_gram_protocol_accept_delegation() function performs the service side accepting of a GRAM protocol
       delegation exchange with a GRAM protocol client. This is performed after the delegation HTTP message has
       been unpacked by the application.

       The globus_gram_protocol_accept_delegation() function returns after processing the GSSAPI handshake,
       passing the delegated credential or error information to the function pointed to by the callback
       parameter.

       Parameters:
           handle A GRAM protocol handle on which the server received a protocol refresh message.
           restriction_oids A set of OID values indicating the data in the restriction_buffers parameter. This
           parameter may have the value GSS_C_NO_OID_SET if there are no restriction buffers.
           restriction_buffers A set of binary data buffers which will be included in the delegated credential.
           The type of data in these buffers is determined by the OID values in restriction_oids. This parameter
           may have the value GSS_C_EMPTY_BUFFER_SET if there are no extra restrictions to be added to the
           credential.
           req_flags A bitwise-or of GSSAPI flag values to use when delegating the credential using
           gss_init_delegation().
           time_req An integer value indicating the length of time (in seconds) that the delegated credential
           should be valid for. This is an advisory parameter: no error will be returned if a credential with
           the requested lifetime can not be created.
           callback A pointer to a function to call when the delegation handshake has completed or failed. This
           function will be passed the value of arg as well as the handle and delegated credential or erorr that
           occurred processing the delegation messages.
           arg A pointer to application-specific data which will be passed to the function pointed to by
           callback as its first parameter. This may be NULL if the application has a NULL callback or does not
           require the pointer to establish its context in the callback.

       Returns:
           Upon success, globus_gram_protocol_accept_delegation() returns GLOBUS_SUCCESS and registers the
           function pointed to by callback to be called after the delegation completes or fails. If an error
           occurs, globus_gram_protocol_accept_delegation() returns an integer error code and the callback
           function is not registered.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_MALLOC_FAILED Malloc failed
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request
           GLOBUS_GRAM_PROTOCOL_ERROR_NO_RESOURCES No resources

   int globus_gram_protocol_allow_attach (char ** url, globus_gram_protocol_callback_t callback, void *
       callback_arg)
       Create a GRAM protocol service listener. The globus_gram_protocol_allow_attach() function creates a GRAM
       protocol listener to which other processes can send GRAM protocol messages. The listener will
       automatically accept new connections on it's TCP/IP port and parse GRAM requests. The requests will be
       passed to the function pointed to by the callback parameter for the application to unpack, handle, and
       send a reply by calling globus_gram_protocol_reply().

       Parameters:
           url An output parameter that will be initialized to point to a string that will hold the URL of the
           new listener. This URL may be published or otherwise passed to applications which need to contact
           this GRAM protocol server. The URL will be of the form https://host:port/.
           callback A pointer to a function to be called when a new request has been received by this listener.
           This function will be passed the request, which may be unpacked using one of the functions described
           in the message packing  section of the documentation.
           callback_arg A pointer to arbitrary user data which will be passed to the callback function as its
           first parameter.

       Returns:
           Upon success, globus_gram_protocol_allow_attach() returns GLOBUS_SUCCESS and modifies the url
           parameter to point to a newly allocated string. The caller is then responsible for freeing this
           string. If an error occurs, an integer error code will be returned and the url parameter value will
           be uninitialized.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request
           GLOBUS_GRAM_PROTOCOL_ERROR_MALLOC_FAILED Out of memory
           GLOBUS_GRAM_PROTOCOL_ERROR_NO_RESOURCES No resources

       See also:
           globus_gram_protocol_callback_disallow()

   globus_bool_t globus_gram_protocol_authorize_self (gss_ctx_id_t context)
       Determine if a GSSAPI context has the same source and target identities. The
       globus_gram_protocol_authorize_self() function implements a predicate which returns true if the source
       and destination identities used to establish the GSSAPI security context are the same.

       Parameters:
           context A GSSAPI security context which has been previously established. The source and target names
           of this context will be inspected by this function.

       Returns:
           If the source and target identiies are the same, then globus_gram_protocol_authorize_self() returns
           GLOBUS_TRUE, otherwise, this function returns GLOBUS_FALSE.

       Return values:
           GLOBUS_TRUE The source and target identities are the same.
           GLOBUS_FALSE The source and target identities are not the same or this function is unabled to inspect
           the security context.

   int globus_gram_protocol_callback_disallow (char * url)
       Stop a GASS protocol listener from handling new requests. The globus_gram_protocol_callback_disallow()
       function stops the listener named by the value of the url parameter from receiving any new requests. It
       also frees memory used internally by the GRAM protocol implementation to handle requests for this
       listener.

       The globus_gram_protocol_callback_disallow() function will wait until all requests being processed by
       this listener have completed processing. Once globus_gram_protocol_callback_disallow() returns, no
       further request callbacks will occur for the listener.

       Parameters:
           url A pointer to the URL string which names the listener to disable.

       Returns:
           Upon success, the globus_gram_protocol_callback_disallow() function returns GLOBUS_SUCCESS and frees
           internal state associated with the listener named by the url parameter. If an error occurs, its
           integer error code value will be returned and no listener will be affected.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_JOB_CONTACT Invalid job contact
           GLOBUS_GRAM_PROTOCOL_ERROR_CALLBACK_NOT_FOUND Callback not found

       See also:
           globus_gram_protocol_allow_attach()

   int globus_gram_protocol_get_sec_context (globus_gram_protocol_handle_t handle, gss_ctx_id_t * context)
       Get a reference to the GSSAPI security context associated with a GRAM protocol handle. The
       globus_gram_protocol_get_sec_context() function retrieves a reference to the GSSAPI security context
       associated with a particular GRAM protocol handle. This context may be inspected by the caller but must
       not be destroyed by the caller. The globus_gram_protocol_get_sec_context() function must only be called
       after the GRAM protocol library has called the callback function associated with a GRAM protocol message
       exchange.

       Parameters:
           handle The GRAM protocol handle associated with a GRAM protocol message exchange.
           context The GSSAPI security context associated with the protocol handle.

       Returns:
           Upon success, globus_gram_protocol_get_sec_context() returns GLOBUS_SUCCESS and modifies the context
           parameter to point to the security context associated with the handle parameter. If an error occurs,
           an interger error code is returned and the value of the context parameter is undefined.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request

   int globus_gram_protocol_post (const char * url, globus_gram_protocol_handle_t * handle, globus_io_attr_t *
       attr, globus_byte_t * message, globus_size_t message_size, globus_gram_protocol_callback_t callback, void
       * callback_arg)
       Post a GRAM protocol request to a GRAM server. The globus_gram_protocol_post() function initiates a GRAM
       protocol message exchange with a GRAM protocol listener. It returns after framing the message and
       initiating the connection. When the message exchange is complete, the function pointed to by callback is
       invoked either in another thread or when a non-threaded application calls the globus_poll() or
       globus_cond_wait() functions.

       Parameters:
           url A pointer to a string containing the URL of the server to post the request to. This URL must be
           an HTTPS URL naming a GRAM service resource.
           handle A pointer to a globus_gram_protocol_handle_t which will be initialized with a unique handle
           identifier. This identifier will be passed to the callback function to allow the caller to
           differentiate replies to multiple GRAM Protocol requests. This pointer may be NULL if the caller will
           not have multiple simultaneous requests.
           attr A pointer to a Globus I/O attribute set, which will be used as parameters when connecting to the
           GRAM server. The value of attr may be NULL, in which case, the default GRAM Protocol attributes will
           be used (authentication to self, SSL-compatible transport, with message integrity).
           message A pointer to a message string to be sent to the GRAM server. This is normally created by
           calling one of the GRAM Protocol pack  functions. This message need not be NULL terminated as the
           length is passed in the message_size parameter.
           message_size The length of the message string. Typically generated as one of the output parameters to
           one of the GRAM Protocol pack  functions.
           callback A pointer to a function to call when the response to this message is received or the message
           exchange fails. This may be NULL, in which case no callback will be received, and the caller will be
           unable to verify whether the message was successfully received.
           callback_arg A pointer to application-specific data which will be passed to the function pointed to
           by callback as its first parameter. This may be NULL if the application has a NULL callback or does
           not require the pointer to establish its context in the callback.

       Returns:
           Upon success, globus_gram_protocol_post() returns GLOBUS_SUCCESS, initiates the message exchange,
           registers the function pointed to by callback to be called when the exchange completes or fails, and
           modifies the handle parameter if it is non-NULL. If an error occurs, its error code will be returned,
           the handle parameter will be uninitialized and the function pointed to be callback will not be
           called.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_JOB_CONTACT Invalid job contact
           GLOBUS_GRAM_PROTOCOL_ERROR_MALLOC_FAILED Out of memory
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request
           GLOBUS_GRAM_PROTOCOL_ERROR_NO_RESOURCES No resources

       Note:
           There is no way to time out or cancel a service request that is begun with
           globus_gram_protocol_post().

       See also:
           globus_gram_protocol_reply()

   int globus_gram_protocol_post_delegation (const char * url, globus_gram_protocol_handle_t * handle,
       globus_io_attr_t * attr, globus_byte_t * message, globus_size_t message_size, gss_cred_id_t cred_handle,
       gss_OID_set restriction_oids, gss_buffer_set_t restriction_buffers, OM_uint32 req_flags, OM_uint32
       time_req, globus_gram_protocol_callback_t callback, void * callback_arg)
       Post a GRAM protocol delegation request to a GRAM server. The globus_gram_protocol_post_delegation()
       function initiates a GRAM protocol delegation exchange with a GRAM protocol listener. The delegation
       protocol is a custom mix of HTTP and SSL records.

       The globus_gram_protocol_post_delegation() function returns after framing the message and initiating the
       connection to be used for delegation. When the message exchange is complete, the function pointed to by
       callback is invoked either in another thread or when a non-threaded application calls the globus_poll()
       or globus_cond_wait() functions.

       Parameters:
           url A pointer to a string containing the URL of the server to post the request to. This URL must be
           an HTTPS URL naming a GRAM service resource.
           handle A pointer to a globus_gram_protocol_handle_t which will be initialized with a unique handle
           identifier. This identifier will be passed to the callback function to allow the caller to
           differentiate replies to multiple GRAM Protocol requests. This pointer may be NULL if the caller will
           not have multiple simultaneous requests.
           attr A pointer to a Globus I/O attribute set, which will be used as parameters when connecting to the
           GRAM server. The value of attr may be NULL, in which case, the default GRAM Protocol attributes will
           be used (authentication to self, SSL-compatible transport, with message integrity).
           message A pointer to a message string to be sent to the GRAM server. This is normally created by
           calling one of the GRAM Protocol pack  functions. This message need not be NULL terminated as the
           length is passed in the message_size parameter.
           message_size The length of the message string. Typically generated as one of the output parameters to
           one of the GRAM Protocol pack  functions.
           cred_handle Handle to an existing GSSAPI security credential. If this parameter is set to
           GSS_C_NO_CREDENTIAL, then the current account's default credential will be used. A proxy credential
           sharing the identity of this credential will be delegated to the GRAM protocol server.
           restriction_oids A set of OID values indicating the data in the restriction_buffers parameter. This
           parameter may have the value GSS_C_NO_OID_SET if there are no restriction buffers.
           restriction_buffers A set of binary data buffers which will be included in the delegated credential.
           The type of data in these buffers is determined by the OID values in restriction_oids. This parameter
           may have the value GSS_C_EMPTY_BUFFER_SET if there are no extra restrictions to be added to the
           credential.
           req_flags A bitwise-or of GSSAPI flag values to use when delegating the credential using
           gss_init_delegation().
           time_req An integer value indicating the length of time (in seconds) that the delegated credential
           should be valid for. This is an advisory parameter: no error will be returned if a credential with
           the requested lifetime can not be created.
           callback A pointer to a function to call when the response to this message is received or the message
           exchange fails. This may be NULL, in which case no callback will be received, and the caller will be
           unable to verify whether the message was successfully received.
           callback_arg A pointer to application-specific data which will be passed to the function pointed to
           by callback as its first parameter. This may be NULL if the application has a NULL callback or does
           not require the pointer to establish its context in the callback.

       Returns:
           Upon success, globus_gram_protocol_post_delegation() returns GLOBUS_SUCCESS, initiates the message
           exchange, registers the function pointed to by callback to be called when the exchange completes or
           fails, and modifies the handle parameter if it is non-NULL. If an error occurs, its error code will
           be returned, the handle parameter will be uninitialized and the function pointed to be callback will
           not be called. In the case of a protocol or delegation failure, the callback function will be called
           with the errorcode parameter set to the error.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_JOB_CONTACT Invalid job contact
           GLOBUS_GRAM_PROTOCOL_ERROR_MALLOC_FAILED Out of memory
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request
           GLOBUS_GRAM_PROTOCOL_ERROR_NO_RESOURCES No resources

       Note:
           There is no way to time out or cancel a service request that is begun with
           globus_gram_protocol_post_delegation().

       See also:
           globus_gram_protocol_reply()

   int globus_gram_protocol_reply (globus_gram_protocol_handle_t handle, int code, globus_byte_t * message,
       globus_size_t message_size)
       Reply to a GRAM protocol message. The globus_gram_protocol_reply() function sends a response message to a
       client which initiated a GRAM message exchange. The globus_gram_protocol_reply() function composes the
       message with an HTTP message frame and then sends it to the client which initiated the exchange.

       Parameters:
           handle A GRAM protocol handle which is used by this function to determine the network connection to
           use for this reply. This must be the same value as was passed as a parameter to the callback function
           registered with the globus_gram_protocol_allow_attach() function.
           code The HTTP response code. The code should be one from the set described in RFC 2616.
           message A pointer to a message string to be sent to the GRAM client. This is normally created by
           calling one of the GRAM Protocol pack  functions. This message need not be NULL terminated as the
           length is passed in the message_size parameter.
           message_size The length of the message string. Typically generated as one of the output parameters to
           one of the GRAM Protocol pack  functions.

       Returns:
           Upon success, globus_gram_protocol_reply() returns GLOBUS_SUCCESS, frames the message with an HTTP
           header and initiates sending the message to the client. The caller must not try to use the value of
           the handle parameter after this function returns. If an error occurs, its integer error code will be
           returned.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_REQUEST Invalid request
           GLOBUS_GRAM_PROTOCOL_ERROR_NO_RESOURCES No Resources

       See also:
           globus_gram_protocol_allow_attach()

   int globus_gram_protocol_setup_attr (globus_io_attr_t * attr)
       Create default I/O attribute for GRAM. The globus_gram_protocol_setup_attr() function creates a new
       globus_io attribute containing the default set of values needed for communication between a GRAM client
       and a job manager. These attributes include:

       • SO_KEEPALIVE

       • GSSAPI Mutual Authentication

       • GSSAPI Self Authorization

       • SSL-compatible message wrapping

       Parameters:
           attr A pointer to a globus_io_attr_t structure which will be initialized by this function.

       Returns:
           Upon success, globus_gram_protocol_setup_attr() modifies the attr parameter to point to a new
           attribute and returns the value GLOBUS_SUCCESS. When this occurs, the caller must destroy the
           attribute when no longer needed by calling globus_io_tcpattr_destroy(). If an error occurs, its value
           will be returned and the attribute pointed to by the attr parameter will be set to an uninitialized
           state.

       Return values:
           GLOBUS_SUCCESS Success
           GLOBUS_GRAM_PROTOCOL_ERROR_CONNECTION_FAILED Error initializing attribute

Author

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