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net-snmp/agent/helpers/table_data.c

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/*
* Portions of this file are subject to the following copyright(s). See
* the Net-SNMP's COPYING file for more details and other copyrights
* that may apply:
*
* Portions of this file are copyrighted by:
* Copyright (c) 2016 VMware, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-features.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/agent/table_data.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <net-snmp/agent/table.h>
#include <net-snmp/agent/read_only.h>
netsnmp_feature_child_of(table_data_all, mib_helpers)
netsnmp_feature_child_of(table_data, table_data_all)
netsnmp_feature_child_of(register_read_only_table_data, table_data_all)
netsnmp_feature_child_of(extract_table_row_data, table_data_all)
netsnmp_feature_child_of(insert_table_row, table_data_all)
netsnmp_feature_child_of(table_data_delete_table, table_data_all)
netsnmp_feature_child_of(table_data_extras, table_data_all)
netsnmp_feature_child_of(table_data_create_table, table_data_extras)
netsnmp_feature_child_of(table_data_create_row, table_data_extras)
netsnmp_feature_child_of(table_data_copy_row, table_data_extras)
netsnmp_feature_child_of(table_data_remove_delete_row, table_data_extras)
netsnmp_feature_child_of(table_data_unregister, table_data_extras)
netsnmp_feature_child_of(table_data_row_count, table_data_extras)
netsnmp_feature_child_of(table_data_row_operations, table_data_extras)
netsnmp_feature_child_of(table_data_row_first, table_data_extras)
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA
/** @defgroup table_data table_data
* Helps you implement a table with datamatted storage.
* @ingroup table
*
* This helper is obsolete. If you are writing a new module, please
* consider using the table_tdata helper instead.
*
* This helper helps you implement a table where all the indexes are
* expected to be stored within the agent itself and not in some
* external storage location. It can be used to store a list of
* rows, where a row consists of the indexes to the table and a
* generic data pointer. You can then implement a subhandler which
* is passed the exact row definition and data it must return data
* for or accept data for. Complex GETNEXT handling is greatly
* simplified in this case.
*
* @{
*/
/* ==================================
*
* Table Data API: Table maintenance
*
* ================================== */
/*
* generates the index portion of an table oid from a varlist.
*/
void
netsnmp_table_data_generate_index_oid(netsnmp_table_row *row)
{
build_oid(&row->index_oid, &row->index_oid_len, NULL, 0, row->indexes);
}
/** creates and returns a pointer to table data set */
netsnmp_table_data *
netsnmp_create_table_data(const char *name)
{
netsnmp_table_data *table = SNMP_MALLOC_TYPEDEF(netsnmp_table_data);
if (name && table)
table->name = strdup(name);
return table;
}
/** creates and returns a pointer to table data set */
netsnmp_table_row *
netsnmp_create_table_data_row(void)
{
netsnmp_table_row *row = SNMP_MALLOC_TYPEDEF(netsnmp_table_row);
return row;
}
/** clones a data row. DOES NOT CLONE THE CONTAINED DATA. */
netsnmp_table_row *
netsnmp_table_data_clone_row(netsnmp_table_row *row)
{
netsnmp_table_row *newrow = NULL;
if (!row)
return NULL;
newrow = netsnmp_memdup(row, sizeof(netsnmp_table_row));
if (!newrow)
return NULL;
if (row->indexes) {
newrow->indexes = snmp_clone_varbind(newrow->indexes);
if (!newrow->indexes) {
free(newrow);
return NULL;
}
}
if (row->index_oid) {
newrow->index_oid =
snmp_duplicate_objid(row->index_oid, row->index_oid_len);
if (!newrow->index_oid) {
free(newrow->indexes);
free(newrow);
return NULL;
}
}
return newrow;
}
/** deletes a row's memory.
* returns the void data that it doesn't know how to delete. */
void *
netsnmp_table_data_delete_row(netsnmp_table_row *row)
{
void *data;
if (!row)
return NULL;
/*
* free the memory we can
*/
if (row->indexes)
snmp_free_varbind(row->indexes);
SNMP_FREE(row->index_oid);
data = row->data;
free(row);
/*
* return the void * pointer
*/
return data;
}
/**
* Adds a row of data to a given table (stored in proper lexographical order).
*
* returns SNMPERR_SUCCESS on successful addition.
* or SNMPERR_GENERR on failure (E.G., indexes already existed)
*/
int
netsnmp_table_data_add_row(netsnmp_table_data *table,
netsnmp_table_row *row)
{
int rc, dup = 0;
netsnmp_table_row *nextrow = NULL, *prevrow;
if (!row || !table)
return SNMPERR_GENERR;
if (row->indexes)
netsnmp_table_data_generate_index_oid(row);
/*
* we don't store the index info as it
* takes up memory.
*/
if (!table->store_indexes) {
snmp_free_varbind(row->indexes);
row->indexes = NULL;
}
if (!row->index_oid) {
snmp_log(LOG_ERR,
"illegal data attempted to be added to table %s (no index)\n",
table->name);
return SNMPERR_GENERR;
}
/*
* check for simple append
*/
if ((prevrow = table->last_row) != NULL) {
rc = snmp_oid_compare(prevrow->index_oid, prevrow->index_oid_len,
row->index_oid, row->index_oid_len);
if (0 == rc)
dup = 1;
}
else
rc = 1;
/*
* if no last row, or newrow < last row, search the table and
* insert it into the table in the proper oid-lexographical order
*/
if (rc > 0) {
for (nextrow = table->first_row, prevrow = NULL;
nextrow != NULL; prevrow = nextrow, nextrow = nextrow->next) {
if (NULL == nextrow->index_oid) {
DEBUGMSGT(("table_data_add_data", "row doesn't have index!\n"));
/** xxx-rks: remove invalid row? */
continue;
}
rc = snmp_oid_compare(nextrow->index_oid, nextrow->index_oid_len,
row->index_oid, row->index_oid_len);
if(rc > 0)
break;
if (0 == rc) {
dup = 1;
break;
}
}
}
if (dup) {
/*
* exact match. Duplicate entries illegal
*/
snmp_log(LOG_WARNING,
"duplicate table data attempted to be entered. row exists\n");
return SNMPERR_GENERR;
}
/*
* ok, we have the location of where it should go
*/
/*
* (after prevrow, and before nextrow)
*/
row->next = nextrow;
row->prev = prevrow;
if (row->next)
row->next->prev = row;
if (row->prev)
row->prev->next = row;
if (NULL == row->prev) /* it's the (new) first row */
table->first_row = row;
if (NULL == row->next) /* it's the last row */
table->last_row = row;
DEBUGMSGTL(("table_data_add_data", "added something...\n"));
return SNMPERR_SUCCESS;
}
/** swaps out origrow with newrow. This does *not* delete/free anything! */
void
netsnmp_table_data_replace_row(netsnmp_table_data *table,
netsnmp_table_row *origrow,
netsnmp_table_row *newrow)
{
netsnmp_table_data_remove_row(table, origrow);
netsnmp_table_data_add_row(table, newrow);
}
/**
* removes a row of data to a given table and returns it (no free's called)
*
* returns the row pointer itself on successful removing.
* or NULL on failure (bad arguments)
*/
netsnmp_table_row *
netsnmp_table_data_remove_row(netsnmp_table_data *table,
netsnmp_table_row *row)
{
if (!row || !table)
return NULL;
if (row->prev)
row->prev->next = row->next;
else
table->first_row = row->next;
if (row->next)
row->next->prev = row->prev;
else
table->last_row = row->prev;
return row;
}
/**
* removes and frees a row of data to a given table and returns the void *
*
* returns the void * data on successful deletion.
* or NULL on failure (bad arguments)
*/
void *
netsnmp_table_data_remove_and_delete_row(netsnmp_table_data *table,
netsnmp_table_row *row)
{
if (!row || !table)
return NULL;
/*
* remove it from the list
*/
netsnmp_table_data_remove_row(table, row);
return netsnmp_table_data_delete_row(row);
}
/* =====================================
* Generic API - mostly renamed wrappers
* ===================================== */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_CREATE_TABLE
netsnmp_table_data *
netsnmp_table_data_create_table(const char *name, long flags)
{
return netsnmp_create_table_data( name );
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_CREATE_TABLE */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_DELETE_TABLE
void
netsnmp_table_data_delete_table( netsnmp_table_data *table )
{
netsnmp_table_row *row, *nextrow;
if (!table)
return;
snmp_free_varbind(table->indexes_template);
table->indexes_template = NULL;
for (row = table->first_row; row; row=nextrow) {
nextrow = row->next;
row->next = NULL;
netsnmp_table_data_delete_row(row);
/* Can't delete table-specific entry memory */
}
table->first_row = NULL;
SNMP_FREE(table->name);
SNMP_FREE(table);
return;
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_DELETE_TABLE */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_CREATE_ROW
netsnmp_table_row *
netsnmp_table_data_create_row( void* entry )
{
netsnmp_table_row *row = SNMP_MALLOC_TYPEDEF(netsnmp_table_row);
if (row)
row->data = entry;
return row;
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_CREATE_ROW */
/* netsnmp_table_data_clone_row() defined above */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_COPY_ROW
int
netsnmp_table_data_copy_row( netsnmp_table_row *old_row,
netsnmp_table_row *new_row )
{
if (!old_row || !new_row)
return -1;
memcpy(new_row, old_row, sizeof(netsnmp_table_row));
if (old_row->indexes)
new_row->indexes = snmp_clone_varbind(old_row->indexes);
if (old_row->index_oid)
new_row->index_oid =
snmp_duplicate_objid(old_row->index_oid, old_row->index_oid_len);
/* XXX - Doesn't copy table-specific row structure */
return 0;
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_COPY_ROW */
/*
* netsnmp_table_data_delete_row()
* netsnmp_table_data_add_row()
* netsnmp_table_data_replace_row()
* netsnmp_table_data_remove_row()
* all defined above
*/
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_REMOVE_DELETE_ROW
void *
netsnmp_table_data_remove_delete_row(netsnmp_table_data *table,
netsnmp_table_row *row)
{
return netsnmp_table_data_remove_and_delete_row(table, row);
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_REMOVE_DELETE_ROW */
/* ==================================
*
* Table Data API: MIB maintenance
*
* ================================== */
/** Creates a table_data handler and returns it */
netsnmp_mib_handler *
netsnmp_get_table_data_handler(netsnmp_table_data *table)
{
netsnmp_mib_handler *ret = NULL;
if (!table) {
snmp_log(LOG_INFO,
"netsnmp_get_table_data_handler(NULL) called\n");
return NULL;
}
ret =
netsnmp_create_handler(TABLE_DATA_NAME,
netsnmp_table_data_helper_handler);
if (ret) {
ret->flags |= MIB_HANDLER_AUTO_NEXT;
ret->myvoid = (void *) table;
}
return ret;
}
/** registers a handler as a data table.
* If table_info != NULL, it registers it as a normal table too. */
int
netsnmp_register_table_data(netsnmp_handler_registration *reginfo,
netsnmp_table_data *table,
netsnmp_table_registration_info *table_info)
{
netsnmp_mib_handler *handler = netsnmp_get_table_data_handler(table);
if (!table || !handler ||
(netsnmp_inject_handler(reginfo, handler) != SNMPERR_SUCCESS)) {
snmp_log(LOG_ERR, "could not create table data handler\n");
netsnmp_handler_free(handler);
netsnmp_handler_registration_free(reginfo);
return MIB_REGISTRATION_FAILED;
}
return netsnmp_register_table(reginfo, table_info);
}
#ifndef NETSNMP_FEATURE_REMOVE_REGISTER_READ_ONLY_TABLE_DATA
/** registers a handler as a read-only data table
* If table_info != NULL, it registers it as a normal table too. */
int
netsnmp_register_read_only_table_data(netsnmp_handler_registration *reginfo,
netsnmp_table_data *table,
netsnmp_table_registration_info *table_info)
{
netsnmp_mib_handler *handler = netsnmp_get_read_only_handler();
if (!handler ||
(netsnmp_inject_handler(reginfo, handler) != SNMPERR_SUCCESS)) {
snmp_log(LOG_ERR, "could not create read only table data handler\n");
netsnmp_handler_free(handler);
netsnmp_handler_registration_free(reginfo);
return MIB_REGISTRATION_FAILED;
}
return netsnmp_register_table_data(reginfo, table, table_info);
}
#endif /* NETSNMP_FEATURE_REMOVE_REGISTER_READ_ONLY_TABLE_DATA */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_UNREGISTER
int
netsnmp_unregister_table_data(netsnmp_handler_registration *reginfo)
{
/* free table; */
return netsnmp_unregister_table(reginfo);
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_UNREGISTER */
/*
* The helper handler that takes care of passing a specific row of
* data down to the lower handler(s). It sets request->processed if
* the request should not be handled.
*/
int
netsnmp_table_data_helper_handler(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
netsnmp_table_data *table = (netsnmp_table_data *) handler->myvoid;
netsnmp_request_info *request;
int valid_request = 0;
netsnmp_table_row *row;
netsnmp_table_request_info *table_info;
netsnmp_table_registration_info *table_reg_info =
netsnmp_find_table_registration_info(reginfo);
int result, regresult;
int oldmode;
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
table_info = netsnmp_extract_table_info(request);
if (!table_info)
continue; /* ack */
switch (reqinfo->mode) {
case MODE_GET:
case MODE_GETNEXT:
#ifndef NETSNMP_NO_WRITE_SUPPORT
case MODE_SET_RESERVE1:
#endif /* NETSNMP_NO_WRITE_SUPPORT */
netsnmp_request_add_list_data(request,
netsnmp_create_data_list(
TABLE_DATA_TABLE, table, NULL));
}
/*
* find the row in question
*/
switch (reqinfo->mode) {
case MODE_GETNEXT:
case MODE_GETBULK: /* XXXWWW */
if (request->requestvb->type != ASN_NULL)
continue;
/*
* loop through data till we find the next row
*/
result = snmp_oid_compare(request->requestvb->name,
request->requestvb->name_length,
reginfo->rootoid,
reginfo->rootoid_len);
regresult = snmp_oid_compare(request->requestvb->name,
SNMP_MIN(request->requestvb->
name_length,
reginfo->rootoid_len),
reginfo->rootoid,
reginfo->rootoid_len);
if (regresult == 0
&& request->requestvb->name_length < reginfo->rootoid_len)
regresult = -1;
if (result < 0 || 0 == result) {
/*
* before us entirely, return the first
*/
row = table->first_row;
table_info->colnum = table_reg_info->min_column;
} else if (regresult == 0 && request->requestvb->name_length ==
reginfo->rootoid_len + 1 &&
/* entry node must be 1, but any column is ok */
request->requestvb->name[reginfo->rootoid_len] == 1) {
/*
* exactly to the entry
*/
row = table->first_row;
table_info->colnum = table_reg_info->min_column;
} else if (regresult == 0 && request->requestvb->name_length ==
reginfo->rootoid_len + 2 &&
/* entry node must be 1, but any column is ok */
request->requestvb->name[reginfo->rootoid_len] == 1) {
/*
* exactly to the column
*/
row = table->first_row;
} else {
/*
* loop through all rows looking for the first one
* that is equal to the request or greater than it
*/
for (row = table->first_row; row; row = row->next) {
/*
* compare the index of the request to the row
*/
result =
snmp_oid_compare(row->index_oid,
row->index_oid_len,
request->requestvb->name + 2 +
reginfo->rootoid_len,
request->requestvb->name_length -
2 - reginfo->rootoid_len);
if (result == 0) {
/*
* equal match, return the next row
*/
row = row->next;
break;
} else if (result > 0) {
/*
* the current row is greater than the
* request, use it
*/
break;
}
}
}
if (!row) {
table_info->colnum++;
if (table_info->colnum <= table_reg_info->max_column) {
row = table->first_row;
}
}
if (row) {
valid_request = 1;
netsnmp_request_add_list_data(request,
netsnmp_create_data_list
(TABLE_DATA_ROW, row,
NULL));
/*
* Set the name appropriately, so we can pass this
* request on as a simple GET request
*/
netsnmp_table_data_build_result(reginfo, reqinfo, request,
row,
table_info->colnum,
ASN_NULL, NULL, 0);
} else { /* no decent result found. Give up. It's beyond us. */
request->processed = 1;
}
break;
case MODE_GET:
if (request->requestvb->type != ASN_NULL)
continue;
/*
* find the row in question
*/
if (request->requestvb->name_length < (reginfo->rootoid_len + 3)) { /* table.entry.column... */
/*
* request too short
*/
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
break;
} else if (NULL ==
(row =
netsnmp_table_data_get_from_oid(table,
request->
requestvb->name +
reginfo->
rootoid_len + 2,
request->
requestvb->
name_length -
reginfo->
rootoid_len -
2))) {
/*
* no such row
*/
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
break;
} else {
valid_request = 1;
netsnmp_request_add_list_data(request,
netsnmp_create_data_list
(TABLE_DATA_ROW, row,
NULL));
}
break;
#ifndef NETSNMP_NO_WRITE_SUPPORT
case MODE_SET_RESERVE1:
valid_request = 1;
if (NULL !=
(row =
netsnmp_table_data_get_from_oid(table,
request->requestvb->name +
reginfo->rootoid_len + 2,
request->requestvb->
name_length -
reginfo->rootoid_len -
2))) {
netsnmp_request_add_list_data(request,
netsnmp_create_data_list
(TABLE_DATA_ROW, row,
NULL));
}
break;
case MODE_SET_RESERVE2:
case MODE_SET_ACTION:
case MODE_SET_COMMIT:
case MODE_SET_FREE:
case MODE_SET_UNDO:
valid_request = 1;
#endif /* NETSNMP_NO_WRITE_SUPPORT */
}
}
if (valid_request &&
(reqinfo->mode == MODE_GETNEXT || reqinfo->mode == MODE_GETBULK)) {
/*
* If this is a GetNext or GetBulk request, then we've identified
* the row that ought to include the appropriate next instance.
* Convert the request into a Get request, so that the lower-level
* handlers don't need to worry about skipping on, and call these
* handlers ourselves (so we can undo this again afterwards).
*/
oldmode = reqinfo->mode;
reqinfo->mode = MODE_GET;
result = netsnmp_call_next_handler(handler, reginfo, reqinfo,
requests);
reqinfo->mode = oldmode;
handler->flags |= MIB_HANDLER_AUTO_NEXT_OVERRIDE_ONCE;
return result;
}
else
/* next handler called automatically - 'AUTO_NEXT' */
return SNMP_ERR_NOERROR;
}
/** extracts the table being accessed passed from the table_data helper */
netsnmp_table_data *
netsnmp_extract_table(netsnmp_request_info *request)
{
return (netsnmp_table_data *)
netsnmp_request_get_list_data(request, TABLE_DATA_TABLE);
}
/** extracts the row being accessed passed from the table_data helper */
netsnmp_table_row *
netsnmp_extract_table_row(netsnmp_request_info *request)
{
return (netsnmp_table_row *) netsnmp_request_get_list_data(request,
TABLE_DATA_ROW);
}
#ifndef NETSNMP_FEATURE_REMOVE_EXTRACT_TABLE_ROW_DATA
/** extracts the data from the row being accessed passed from the
* table_data helper */
void *
netsnmp_extract_table_row_data(netsnmp_request_info *request)
{
netsnmp_table_row *row;
row = (netsnmp_table_row *) netsnmp_extract_table_row(request);
if (row)
return row->data;
else
return NULL;
}
#endif /* NETSNMP_FEATURE_REMOVE_EXTRACT_TABLE_ROW_DATA */
#ifndef NETSNMP_FEATURE_REMOVE_INSERT_TABLE_ROW
/** inserts a newly created table_data row into a request */
void
netsnmp_insert_table_row(netsnmp_request_info *request,
netsnmp_table_row *row)
{
netsnmp_request_info *req;
netsnmp_table_request_info *table_info = NULL;
netsnmp_variable_list *this_index = NULL;
netsnmp_variable_list *that_index = NULL;
oid base_oid[] = {0, 0}; /* Make sure index OIDs are legal! */
oid this_oid[MAX_OID_LEN];
oid that_oid[MAX_OID_LEN];
size_t this_oid_len, that_oid_len;
if (!request)
return;
/*
* We'll add the new row information to any request
* structure with the same index values as the request
* passed in (which includes that one!).
*
* So construct an OID based on these index values.
*/
table_info = netsnmp_extract_table_info(request);
this_index = table_info->indexes;
build_oid_noalloc(this_oid, MAX_OID_LEN, &this_oid_len,
base_oid, 2, this_index);
/*
* We need to look through the whole of the request list
* (as received by the current handler), as there's no
* guarantee that this routine will be called by the first
* varbind that refers to this row.
* In particular, a RowStatus controlled row creation
* may easily occur later in the variable list.
*
* So first, we rewind to the head of the list....
*/
for (req=request; req->prev; req=req->prev)
;
/*
* ... and then start looking for matching indexes
* (by constructing OIDs from these index values)
*/
for (; req; req=req->next) {
table_info = netsnmp_extract_table_info(req);
that_index = table_info->indexes;
build_oid_noalloc(that_oid, MAX_OID_LEN, &that_oid_len,
base_oid, 2, that_index);
/*
* This request has the same index values,
* so add the newly-created row information.
*/
if (snmp_oid_compare(this_oid, this_oid_len,
that_oid, that_oid_len) == 0) {
netsnmp_request_add_list_data(req,
netsnmp_create_data_list(TABLE_DATA_ROW, row, NULL));
}
}
}
#endif /* NETSNMP_FEATURE_REMOVE_INSERT_TABLE_ROW */
/* builds a result given a row, a varbind to set and the data */
int
netsnmp_table_data_build_result(netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *request,
netsnmp_table_row *row,
int column,
u_char type,
u_char * result_data,
size_t result_data_len)
{
oid build_space[MAX_OID_LEN];
if (!reginfo || !reqinfo || !request)
return SNMPERR_GENERR;
if (reqinfo->mode == MODE_GETNEXT || reqinfo->mode == MODE_GETBULK) {
/*
* only need to do this for getnext type cases where oid is changing
*/
memcpy(build_space, reginfo->rootoid, /* registered oid */
reginfo->rootoid_len * sizeof(oid));
build_space[reginfo->rootoid_len] = 1; /* entry */
build_space[reginfo->rootoid_len + 1] = column; /* column */
memcpy(build_space + reginfo->rootoid_len + 2, /* index data */
row->index_oid, row->index_oid_len * sizeof(oid));
snmp_set_var_objid(request->requestvb, build_space,
reginfo->rootoid_len + 2 + row->index_oid_len);
}
snmp_set_var_typed_value(request->requestvb, type,
result_data, result_data_len);
return SNMPERR_SUCCESS; /* WWWXXX: check for bounds */
}
/* ==================================
*
* Table Data API: Row operations
* (table-independent rows)
*
* ================================== */
/** returns the first row in the table */
netsnmp_table_row *
netsnmp_table_data_get_first_row(netsnmp_table_data *table)
{
if (!table)
return NULL;
return table->first_row;
}
/** returns the next row in the table */
netsnmp_table_row *
netsnmp_table_data_get_next_row(netsnmp_table_data *table,
netsnmp_table_row *row)
{
if (!row)
return NULL;
return row->next;
}
/** finds the data in "datalist" stored at "indexes" */
netsnmp_table_row *
netsnmp_table_data_get(netsnmp_table_data *table,
netsnmp_variable_list * indexes)
{
oid searchfor[MAX_OID_LEN];
size_t searchfor_len = MAX_OID_LEN;
build_oid_noalloc(searchfor, MAX_OID_LEN, &searchfor_len, NULL, 0,
indexes);
return netsnmp_table_data_get_from_oid(table, searchfor,
searchfor_len);
}
/** finds the data in "datalist" stored at the searchfor oid */
netsnmp_table_row *
netsnmp_table_data_get_from_oid(netsnmp_table_data *table,
oid * searchfor, size_t searchfor_len)
{
netsnmp_table_row *row;
if (!table)
return NULL;
for (row = table->first_row; row != NULL; row = row->next) {
if (row->index_oid &&
snmp_oid_compare(searchfor, searchfor_len,
row->index_oid, row->index_oid_len) == 0)
return row;
}
return NULL;
}
int
netsnmp_table_data_num_rows(netsnmp_table_data *table)
{
int i=0;
netsnmp_table_row *row;
if (!table)
return 0;
for (row = table->first_row; row; row = row->next) {
i++;
}
return i;
}
/* =====================================
* Generic API - mostly renamed wrappers
* ===================================== */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_FIRST
netsnmp_table_row *
netsnmp_table_data_row_first(netsnmp_table_data *table)
{
return netsnmp_table_data_get_first_row(table);
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_FIRST */
netsnmp_table_row *
netsnmp_table_data_row_get( netsnmp_table_data *table,
netsnmp_table_row *row)
{
if (!table || !row)
return NULL;
return netsnmp_table_data_get_from_oid(table, row->index_oid,
row->index_oid_len);
}
netsnmp_table_row *
netsnmp_table_data_row_next( netsnmp_table_data *table,
netsnmp_table_row *row)
{
return netsnmp_table_data_get_next_row(table, row);
}
netsnmp_table_row *
netsnmp_table_data_row_get_byoid( netsnmp_table_data *table,
oid *instance, size_t len)
{
return netsnmp_table_data_get_from_oid(table, instance, len);
}
netsnmp_table_row *
netsnmp_table_data_row_next_byoid(netsnmp_table_data *table,
oid *instance, size_t len)
{
netsnmp_table_row *row;
if (!table || !instance)
return NULL;
for (row = table->first_row; row; row = row->next) {
if (snmp_oid_compare(row->index_oid,
row->index_oid_len,
instance, len) > 0)
return row;
}
return NULL;
}
netsnmp_table_row *
netsnmp_table_data_row_get_byidx( netsnmp_table_data *table,
netsnmp_variable_list *indexes)
{
return netsnmp_table_data_get(table, indexes);
}
netsnmp_table_row *
netsnmp_table_data_row_next_byidx(netsnmp_table_data *table,
netsnmp_variable_list *indexes)
{
oid instance[MAX_OID_LEN];
size_t len = MAX_OID_LEN;
if (!table || !indexes)
return NULL;
build_oid_noalloc(instance, MAX_OID_LEN, &len, NULL, 0, indexes);
return netsnmp_table_data_row_next_byoid(table, instance, len);
}
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_COUNT
int
netsnmp_table_data_row_count(netsnmp_table_data *table)
{
return netsnmp_table_data_num_rows(table);
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_COUNT */
/* ==================================
*
* Table Data API: Row operations
* (table-specific rows)
*
* ================================== */
#ifndef NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_OPERATIONS
void *
netsnmp_table_data_entry_first(netsnmp_table_data *table)
{
netsnmp_table_row *row =
netsnmp_table_data_get_first_row(table);
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_get( netsnmp_table_data *table,
netsnmp_table_row *row)
{
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_next( netsnmp_table_data *table,
netsnmp_table_row *row)
{
row =
netsnmp_table_data_row_next(table, row);
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_get_byidx( netsnmp_table_data *table,
netsnmp_variable_list *indexes)
{
netsnmp_table_row *row =
netsnmp_table_data_row_get_byidx(table, indexes);
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_next_byidx(netsnmp_table_data *table,
netsnmp_variable_list *indexes)
{
netsnmp_table_row *row =
netsnmp_table_data_row_next_byidx(table, indexes);
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_get_byoid( netsnmp_table_data *table,
oid *instance, size_t len)
{
netsnmp_table_row *row =
netsnmp_table_data_row_get_byoid(table, instance, len);
return (row ? row->data : NULL );
}
void *
netsnmp_table_data_entry_next_byoid(netsnmp_table_data *table,
oid *instance, size_t len)
{
netsnmp_table_row *row =
netsnmp_table_data_row_next_byoid(table, instance, len);
return (row ? row->data : NULL );
}
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA_ROW_OPERATIONS */
/* =====================================
* Generic API - mostly renamed wrappers
* ===================================== */
/* ==================================
*
* Table Data API: Index operations
*
* ================================== */
#else /* NETSNMP_FEATURE_REMOVE_TABLE_DATA */
netsnmp_feature_unused(table_data);
#endif /* NETSNMP_FEATURE_REMOVE_TABLE_DATA */
/** @}
*/
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