table(3snmp) net-snmp table(3snmp)
NAME
table -
Helps you implement a table.
Modules
table_array
Helps you implement a table when data can be stored locally.
table_container
Helps you implement a table when data can be found via a netsnmp_container.
table_data
Helps you implement a table with datamatted storage.
generic_table_API
General requirements for a table helper.
table_iterator
The table iterator helper is designed to simplify the task of writing a table handler for the net-snmp agent when the data being accessed
is not in an oid sorted form and must be accessed externally.
table_row
Helps you implement a table shared across two or more subagents, or otherwise split into individual row slices.
tdata
Implement a table with datamatted storage.
Defines
#define SPARSE_TABLE_HANDLER_NAME 'sparse_table'
Functions
netsnmp_mib_handler * netsnmp_get_table_handler (netsnmp_table_registration_info *tabreq)
Given a netsnmp_table_registration_info object, creates a table handler.
int netsnmp_register_table (netsnmp_handler_registration *reginfo, netsnmp_table_registration_info *tabreq)
creates a table handler given the netsnmp_table_registration_info object, inserts it into the request chain and then calls
netsnmp_register_handler() to register the table into the agent.
NETSNMP_INLINE netsnmp_table_request_info * netsnmp_extract_table_info (netsnmp_request_info *request)
Extracts the processed table information from a given request.
netsnmp_table_registration_info * netsnmp_find_table_registration_info (netsnmp_handler_registration *reginfo)
extracts the registered netsnmp_table_registration_info object from a netsnmp_handler_registration object
int table_helper_handler (netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
implements the table helper handler
netsnmp_mib_handler * netsnmp_sparse_table_handler_get (void)
create sparse table handler
int netsnmp_sparse_table_register (netsnmp_handler_registration *reginfo, netsnmp_table_registration_info *tabreq)
creates a table handler given the netsnmp_table_registration_info object, inserts it into the request chain and then calls
netsnmp_register_handler() to register the table into the agent.
int netsnmp_table_build_result (netsnmp_handler_registration *reginfo, netsnmp_request_info *reqinfo, netsnmp_table_request_info
*table_info, u_char type, u_char *result, size_t result_len)
Builds the result to be returned to the agent given the table information.
int netsnmp_table_build_oid (netsnmp_handler_registration *reginfo, netsnmp_request_info *reqinfo, netsnmp_table_request_info *table_info)
given a registration info object, a request object and the table info object it builds the request->requestvb->name oid from the index
values and column information found in the table_info object.
int netsnmp_table_build_oid_from_index (netsnmp_handler_registration *reginfo, netsnmp_request_info *reqinfo, netsnmp_table_request_info
*table_info)
given a registration info object, a request object and the table info object it builds the request->requestvb->name oid from the index
values and column information found in the table_info object.
int netsnmp_update_variable_list_from_index (netsnmp_table_request_info *tri)
parses an OID into table indexses
int netsnmp_update_indexes_from_variable_list (netsnmp_table_request_info *tri)
builds an oid given a set of indexes.
int netsnmp_check_getnext_reply (netsnmp_request_info *request, oid *prefix, size_t prefix_len, netsnmp_variable_list *newvar,
netsnmp_variable_list **outvar)
checks the original request against the current data being passed in if its greater than the request oid but less than the current
valid return, set the current valid return to the new value.
Detailed Description
Helps you implement a table.
This handler helps you implement a table by doing some of the processing for you.
This handler truly shows the power of the new handler mechanism. By creating a table handler and injecting it into your calling chain, or
by using the netsnmp_register_table() function to register your table, you get access to some pre-parsed information. Specifically, the
table handler pulls out the column number and indexes from the request oid so that you don't have to do the complex work to do that parsing
within your own code.
To do this, the table handler needs to know up front how your table is structured. To inform it about this, you fill in a
table_registeration_info structure that is passed to the table handler. It contains the asn index types for the table as well as the
minimum and maximum column that should be used.
Function Documentation
int netsnmp_check_getnext_reply (netsnmp_request_info * request, oid * prefix, size_t prefix_len, netsnmp_variable_list * newvar,
netsnmp_variable_list ** outvar)
checks the original request against the current data being passed in if its greater than the request oid but less than the current valid
return, set the current valid return to the new value. returns 1 if outvar was replaced with the oid from newvar (success). returns 0 if
not.
Definition at line 881 of file table.c.
NETSNMP_INLINE netsnmp_table_request_info* netsnmp_extract_table_info (netsnmp_request_info * request)
Extracts the processed table information from a given request. Call this from subhandlers on a request to extract the processed
netsnmp_request_info information. The resulting information includes the index values and the column number.
Parameters:
request populated netsnmp request structure
Returns:
populated netsnmp_table_request_info structure
Definition at line 125 of file table.c.
netsnmp_table_registration_info* netsnmp_find_table_registration_info (netsnmp_handler_registration * reginfo)
extracts the registered netsnmp_table_registration_info object from a netsnmp_handler_registration object
Definition at line 134 of file table.c.
netsnmp_mib_handler* netsnmp_get_table_handler (netsnmp_table_registration_info * tabreq)
Given a netsnmp_table_registration_info object, creates a table handler. You can use this table handler by injecting it into a calling
chain. When the handler gets called, it'll do processing and store it's information into the request->parent_data structure.
The table helper handler pulls out the column number and indexes from the request oid so that you don't have to do the complex work of
parsing within your own code.
Parameters:
tabreq is a pointer to a netsnmp_table_registration_info struct. The table handler needs to know up front how your table is structured.
A netsnmp_table_registeration_info structure that is passed to the table handler should contain the asn index types for the table as
well as the minimum and maximum column that should be used.
Returns:
Returns a pointer to a netsnmp_mib_handler struct which contains the handler's name and the access method
Definition at line 85 of file table.c.
int netsnmp_register_table (netsnmp_handler_registration * reginfo, netsnmp_table_registration_info * tabreq)
creates a table handler given the netsnmp_table_registration_info object, inserts it into the request chain and then calls
netsnmp_register_handler() to register the table into the agent.
Definition at line 108 of file table.c.
netsnmp_mib_handler* netsnmp_sparse_table_handler_get (void)
create sparse table handler
Definition at line 722 of file table.c.
int netsnmp_sparse_table_register (netsnmp_handler_registration * reginfo, netsnmp_table_registration_info * tabreq)
creates a table handler given the netsnmp_table_registration_info object, inserts it into the request chain and then calls
netsnmp_register_handler() to register the table into the agent.
Definition at line 733 of file table.c.
int netsnmp_table_build_oid (netsnmp_handler_registration * reginfo, netsnmp_request_info * reqinfo, netsnmp_table_request_info * table_info)
given a registration info object, a request object and the table info object it builds the request->requestvb->name oid from the index
values and column information found in the table_info object. Index values are extracted from the table_info varbinds.
Entry
column
Definition at line 784 of file table.c.
int netsnmp_table_build_oid_from_index (netsnmp_handler_registration * reginfo, netsnmp_request_info * reqinfo, netsnmp_table_request_info *
table_info)
given a registration info object, a request object and the table info object it builds the request->requestvb->name oid from the index
values and column information found in the table_info object. Index values are extracted from the table_info index oid.
Definition at line 821 of file table.c.
int netsnmp_table_build_result (netsnmp_handler_registration * reginfo, netsnmp_request_info * reqinfo, netsnmp_table_request_info *
table_info, u_char type, u_char * result, size_t result_len)
Builds the result to be returned to the agent given the table information. Use this function to return results from lowel level handlers to
the agent. It takes care of building the proper resulting oid (containing proper indexing) and inserts the result value into the returning
varbind.
Definition at line 751 of file table.c.
int netsnmp_update_indexes_from_variable_list (netsnmp_table_request_info * tri)
builds an oid given a set of indexes.
Definition at line 863 of file table.c.
int netsnmp_update_variable_list_from_index (netsnmp_table_request_info * tri)
parses an OID into table indexses
Definition at line 847 of file table.c.
int table_helper_handler (netsnmp_mib_handler * handler, netsnmp_handler_registration * reginfo, netsnmp_agent_request_info * reqinfo,
netsnmp_request_info * requests)
implements the table helper handler
XXX-rks: memory leak. add cleanup handler?
none available
got one ok
for loop
Definition at line 142 of file table.c.
Author
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Version 5.4.3.pre1 23 May 2010 table(3snmp)