/*------------------------------------------------------------------------- * rdbmsRelTable_interface.c * * RDBMSMIB mib module. * * Copyright (c) 2004-2007, PostgreSQL Global Development Group * Author: Joshua Tolley * * $Id: rdbmsRelTable_interface.c,v 1.2 2007/09/13 14:20:44 h-saito Exp $ * *------------------------------------------------------------------------- */ #include "pgsnmpd.h" /* include our parent header */ #include "rdbmsRelTable.h" #include #include "rdbmsRelTable_interface.h" /********************************************************************** ********************************************************************** *** *** Table rdbmsRelTable *** ********************************************************************** **********************************************************************/ /* * rdbmsRelTable is subid 9 of rdbmsObjects. * Its status is Current. * OID: .1.3.6.1.2.1.39.1.9, length: 9 */ typedef struct rdbmsRelTable_interface_ctx_s { netsnmp_container *container; netsnmp_cache *cache; /* optional cache */ rdbmsRelTable_registration_ptr user_ctx; netsnmp_table_registration_info tbl_info; netsnmp_baby_steps_access_methods access_multiplexer; } rdbmsRelTable_interface_ctx; static rdbmsRelTable_interface_ctx rdbmsRelTable_if_ctx; static void _rdbmsRelTable_container_init( rdbmsRelTable_interface_ctx *if_ctx); static Netsnmp_Node_Handler _mfd_rdbmsRelTable_pre_request; static Netsnmp_Node_Handler _mfd_rdbmsRelTable_post_request; static Netsnmp_Node_Handler _mfd_rdbmsRelTable_object_lookup; static Netsnmp_Node_Handler _mfd_rdbmsRelTable_get_values; /** * @internal * Initialize the table rdbmsRelTable * (Define its contents and how it's structured) */ void _rdbmsRelTable_initialize_interface(rdbmsRelTable_registration_ptr reg_ptr, u_long flags) { netsnmp_baby_steps_access_methods *access_multiplexer = &rdbmsRelTable_if_ctx.access_multiplexer; netsnmp_table_registration_info *tbl_info = &rdbmsRelTable_if_ctx.tbl_info; netsnmp_handler_registration *reginfo; netsnmp_mib_handler *handler; int mfd_modes = 0; DEBUGMSGTL(("internal:rdbmsRelTable:_rdbmsRelTable_initialize_interface","called\n")); /************************************************* * * save interface context for rdbmsRelTable */ /* * Setting up the table's definition */ netsnmp_table_helper_add_indexes(tbl_info, ASN_INTEGER, /** index: rdbmsDbIndex */ ASN_INTEGER, /** index: applIndex */ 0); /* Define the minimum and maximum accessible columns. This optimizes retrival. */ tbl_info->min_column = RDBMSRELTABLE_MIN_COL; tbl_info->max_column = RDBMSRELTABLE_MAX_COL; /* * save users context */ rdbmsRelTable_if_ctx.user_ctx = reg_ptr; /* * call data access initialization code */ rdbmsRelTable_init_data(reg_ptr); /* * set up the container */ _rdbmsRelTable_container_init(&rdbmsRelTable_if_ctx); if (NULL == rdbmsRelTable_if_ctx.container) { snmp_log(LOG_ERR,"could not initialize container for rdbmsRelTable\n"); return; } /* * access_multiplexer: REQUIRED wrapper for get request handling */ access_multiplexer->object_lookup = _mfd_rdbmsRelTable_object_lookup; access_multiplexer->get_values = _mfd_rdbmsRelTable_get_values; /* * no wrappers yet */ access_multiplexer->pre_request = _mfd_rdbmsRelTable_pre_request; access_multiplexer->post_request = _mfd_rdbmsRelTable_post_request; /************************************************* * * Create a registration, save our reg data, register table. */ DEBUGMSGTL(("rdbmsRelTable:init_rdbmsRelTable", "Registering rdbmsRelTable as a mibs-for-dummies table.\n")); handler = netsnmp_baby_steps_access_multiplexer_get(access_multiplexer); reginfo = netsnmp_handler_registration_create("rdbmsRelTable", handler, rdbmsRelTable_oid, rdbmsRelTable_oid_size, HANDLER_CAN_BABY_STEP | HANDLER_CAN_RONLY ); if(NULL == reginfo) { snmp_log(LOG_ERR,"error registering table rdbmsRelTable\n"); return; } reginfo->my_reg_void = &rdbmsRelTable_if_ctx; /************************************************* * * set up baby steps handler, create it and inject it */ if( access_multiplexer->object_lookup ) mfd_modes |= BABY_STEP_OBJECT_LOOKUP; if( access_multiplexer->set_values ) mfd_modes |= BABY_STEP_SET_VALUES; if( access_multiplexer->irreversible_commit ) mfd_modes |= BABY_STEP_IRREVERSIBLE_COMMIT; if( access_multiplexer->object_syntax_checks ) mfd_modes |= BABY_STEP_CHECK_OBJECT; if( access_multiplexer->pre_request ) mfd_modes |= BABY_STEP_PRE_REQUEST; if( access_multiplexer->post_request ) mfd_modes |= BABY_STEP_POST_REQUEST; if( access_multiplexer->undo_setup ) mfd_modes |= BABY_STEP_UNDO_SETUP; if( access_multiplexer->undo_cleanup ) mfd_modes |= BABY_STEP_UNDO_CLEANUP; if( access_multiplexer->undo_sets ) mfd_modes |= BABY_STEP_UNDO_SETS; if( access_multiplexer->row_creation ) mfd_modes |= BABY_STEP_ROW_CREATE; if( access_multiplexer->consistency_checks ) mfd_modes |= BABY_STEP_CHECK_CONSISTENCY; if( access_multiplexer->commit ) mfd_modes |= BABY_STEP_COMMIT; if( access_multiplexer->undo_commit ) mfd_modes |= BABY_STEP_UNDO_COMMIT; handler = netsnmp_baby_steps_handler_get(mfd_modes); netsnmp_inject_handler(reginfo, handler); /************************************************* * * inject row_merge helper with prefix rootoid_len + 2 (entry.col) */ handler = netsnmp_get_row_merge_handler(reginfo->rootoid_len + 2); netsnmp_inject_handler(reginfo, handler); /************************************************* * * inject container_table helper */ handler = netsnmp_container_table_handler_get(tbl_info, rdbmsRelTable_if_ctx.container, TABLE_CONTAINER_KEY_NETSNMP_INDEX); netsnmp_inject_handler( reginfo, handler ); /************************************************* * * inject cache helper */ if(NULL != rdbmsRelTable_if_ctx.cache) { handler = netsnmp_cache_handler_get(rdbmsRelTable_if_ctx.cache); netsnmp_inject_handler( reginfo, handler ); } /* * register table */ netsnmp_register_table(reginfo, tbl_info); } /* _rdbmsRelTable_initialize_interface */ void rdbmsRelTable_valid_columns_set(netsnmp_column_info *vc) { rdbmsRelTable_if_ctx.tbl_info.valid_columns = vc; } /* rdbmsRelTable_valid_columns_set */ /** * @internal * convert the index component stored in the context to an oid */ int rdbmsRelTable_index_to_oid(netsnmp_index *oid_idx, rdbmsRelTable_mib_index *mib_idx) { int err = SNMP_ERR_NOERROR; /* * temp storage for parsing indexes */ /* * rdbmsDbIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ netsnmp_variable_list var_rdbmsDbIndex; /* * applIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ netsnmp_variable_list var_applIndex; /* * set up varbinds */ memset( &var_rdbmsDbIndex, 0x00, sizeof(var_rdbmsDbIndex) ); var_rdbmsDbIndex.type = ASN_INTEGER; memset( &var_applIndex, 0x00, sizeof(var_applIndex) ); var_applIndex.type = ASN_INTEGER; /* * chain temp index varbinds together */ var_rdbmsDbIndex.next_variable = &var_applIndex; var_applIndex.next_variable = NULL; DEBUGMSGTL(("verbose:rdbmsRelTable:rdbmsRelTable_index_to_oid","called\n")); /* rdbmsDbIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ snmp_set_var_value(&var_rdbmsDbIndex, (u_char*)&mib_idx->rdbmsDbIndex, sizeof(mib_idx->rdbmsDbIndex)); /* applIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ snmp_set_var_value(&var_applIndex, (u_char*)&mib_idx->applIndex, sizeof(mib_idx->applIndex)); err = build_oid_noalloc(oid_idx->oids, oid_idx->len, (size_t *)&oid_idx->len, NULL, 0, &var_rdbmsDbIndex); if(err) snmp_log(LOG_ERR,"error %d converting index to oid\n", err); /* * parsing may have allocated memory. free it. */ snmp_reset_var_buffers( &var_rdbmsDbIndex ); return err; } /* rdbmsRelTable_index_to_oid */ /** * extract rdbmsRelTable indexes from a netsnmp_index * * @retval SNMP_ERR_NOERROR : no error * @retval SNMP_ERR_GENERR : error */ int rdbmsRelTable_index_from_oid(netsnmp_index *oid_idx, rdbmsRelTable_mib_index *mib_idx) { int err = SNMP_ERR_NOERROR; /* * temp storage for parsing indexes */ /* * rdbmsDbIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ netsnmp_variable_list var_rdbmsDbIndex; /* * applIndex(1)/INTEGER/ASN_INTEGER/long(long)//l/a/w/e/R/d/h */ netsnmp_variable_list var_applIndex; /* * set up varbinds */ memset( &var_rdbmsDbIndex, 0x00, sizeof(var_rdbmsDbIndex) ); var_rdbmsDbIndex.type = ASN_INTEGER; memset( &var_applIndex, 0x00, sizeof(var_applIndex) ); var_applIndex.type = ASN_INTEGER; /* * chain temp index varbinds together */ var_rdbmsDbIndex.next_variable = &var_applIndex; var_applIndex.next_variable = NULL; DEBUGMSGTL(("verbose:rdbmsRelTable:rdbmsRelTable_index_from_oid","called\n")); /* * parse the oid into the individual index components */ err = parse_oid_indexes( oid_idx->oids, oid_idx->len, &var_rdbmsDbIndex ); if (err == SNMP_ERR_NOERROR) { /* * copy out values */ mib_idx->rdbmsDbIndex = *((long *)var_rdbmsDbIndex.val.string); mib_idx->applIndex = *((long *)var_applIndex.val.string); } /* * parsing may have allocated memory. free it. */ snmp_reset_var_buffers( &var_rdbmsDbIndex ); return err; } /* rdbmsRelTable_index_from_oid */ /* ********************************************************************* * @internal * allocate resources for a rdbmsRelTable_rowreq_ctx */ rdbmsRelTable_rowreq_ctx * rdbmsRelTable_allocate_rowreq_ctx(void) { rdbmsRelTable_rowreq_ctx *rowreq_ctx = SNMP_MALLOC_TYPEDEF(rdbmsRelTable_rowreq_ctx); DEBUGMSGTL(("internal:rdbmsRelTable:rdbmsRelTable_allocate_rowreq_ctx","called\n")); if(NULL == rowreq_ctx) { snmp_log(LOG_ERR,"Couldn't allocate memory for a " "rdbmsRelTable_rowreq_ctx.\n"); } rowreq_ctx->oid_idx.oids = rowreq_ctx->oid_tmp; rowreq_ctx->rdbmsRelTable_data_list = NULL; rowreq_ctx->rdbmsRelTable_reg = rdbmsRelTable_if_ctx.user_ctx; return rowreq_ctx; } /* rdbmsRelTable_allocate_rowreq_ctx */ /* * @internal * release resources for a rdbmsRelTable_rowreq_ctx */ void rdbmsRelTable_release_rowreq_ctx(rdbmsRelTable_rowreq_ctx *rowreq_ctx) { DEBUGMSGTL(("internal:rdbmsRelTable:rdbmsRelTable_release_rowreq_ctx","called\n")); netsnmp_assert(NULL != rowreq_ctx); /* * free index oid pointer */ if(rowreq_ctx->oid_idx.oids != rowreq_ctx->oid_tmp) free(rowreq_ctx->oid_idx.oids); SNMP_FREE(rowreq_ctx); } /* rdbmsRelTable_release_rowreq_ctx */ /** * @internal * wrapper */ static int _mfd_rdbmsRelTable_pre_request(netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *agtreq_info, netsnmp_request_info *requests) { int rc = rdbmsRelTable_pre_request(rdbmsRelTable_if_ctx.user_ctx); if (MFD_SUCCESS != rc) { /* * nothing we can do about it but log it */ DEBUGMSGTL(("internal:rdbmsRelTable","error %d from " "rdbmsRelTable_pre_request\n", rc)); netsnmp_request_set_error_all(requests, SNMP_VALIDATE_ERR(rc)); } return SNMP_ERR_NOERROR; } /* _mfd_rdbmsRelTable_pre_request */ /** * @internal * wrapper */ static int _mfd_rdbmsRelTable_post_request(netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *agtreq_info, netsnmp_request_info *requests) { rdbmsRelTable_rowreq_ctx *rowreq_ctx; int rc = rdbmsRelTable_post_request(rdbmsRelTable_if_ctx.user_ctx); if (MFD_SUCCESS != rc) { /* * nothing we can do about it but log it */ DEBUGMSGTL(("internal:rdbmsRelTable","error %d from " "rdbmsRelTable_post_request\n", rc)); } /* * if there are no errors, check for and handle row creation/deletion */ rc = netsnmp_check_requests_error(requests); if ((SNMP_ERR_NOERROR == rc) && (NULL != (rowreq_ctx = netsnmp_container_table_row_extract(requests)))) { if (rowreq_ctx->rowreq_flags & MFD_ROW_CREATED) { rowreq_ctx->rowreq_flags &= ~MFD_ROW_CREATED; CONTAINER_INSERT(rdbmsRelTable_if_ctx.container, rowreq_ctx); } else if (rowreq_ctx->rowreq_flags & MFD_ROW_DELETED) { CONTAINER_REMOVE(rdbmsRelTable_if_ctx.container, rowreq_ctx); rdbmsRelTable_release_rowreq_ctx(rowreq_ctx); } } return SNMP_ERR_NOERROR; } /* _mfd_rdbmsRelTable_post_request */ /** * @internal * wrapper */ static int _mfd_rdbmsRelTable_object_lookup(netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *agtreq_info, netsnmp_request_info *requests) { rdbmsRelTable_rowreq_ctx *rowreq_ctx = netsnmp_container_table_row_extract(requests); DEBUGMSGTL(("internal:rdbmsRelTable:_mfd_rdbmsRelTable_object_lookup","called\n")); /* * get our context from mfd * rdbmsRelTable_interface_ctx *if_ctx = * (rdbmsRelTable_interface_ctx *)reginfo->my_reg_void; */ if(NULL == rowreq_ctx) { netsnmp_request_set_error_all(requests, SNMP_ERR_NOCREATION); } else { rdbmsRelTable_row_prep(rowreq_ctx); } return SNMP_ERR_NOERROR; } /* _mfd_rdbmsRelTable_object_lookup */ /*********************************************************************** * * GET processing * ***********************************************************************/ /* * @internal * Retrieve the value for a particular column */ NETSNMP_STATIC_INLINE int _rdbmsRelTable_get_column( rdbmsRelTable_rowreq_ctx *rowreq_ctx, netsnmp_variable_list *var, int column ) { int rc = SNMPERR_SUCCESS; DEBUGMSGTL(("internal:rdbmsRelTable:_mfd_rdbmsRelTable_get_column","called\n")); netsnmp_assert(NULL != rowreq_ctx); switch(column) { /* rdbmsRelState(1)/INTEGER/ASN_INTEGER/long(u_long)//l/A/w/E/r/d/h */ case COLUMN_RDBMSRELSTATE: var->val_len = sizeof(u_long); var->type = ASN_INTEGER; rc = rdbmsRelState_get(rowreq_ctx, (u_long *)var->val.string ); break; /* rdbmsRelActiveTime(2)/DateAndTime/ASN_OCTET_STR/char(char)//L/A/w/e/R/d/H */ case COLUMN_RDBMSRELACTIVETIME: var->type = ASN_OCTET_STR; rc = rdbmsRelActiveTime_get(rowreq_ctx, (char **)&var->val.string, &var->val_len ); break; default: snmp_log(LOG_ERR,"unknown column %d in _rdbmsRelTable_get_column\n", column); break; } return rc; } /* _rdbmsRelTable_get_column */ int _mfd_rdbmsRelTable_get_values(netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *agtreq_info, netsnmp_request_info *requests) { rdbmsRelTable_rowreq_ctx *rowreq_ctx = netsnmp_container_table_row_extract(requests); netsnmp_table_request_info * tri; u_char * old_string; void (*dataFreeHook)(void *); int rc; DEBUGMSGTL(("internal:rdbmsRelTable:_mfd_rdbmsRelTable_get_values","called\n")); netsnmp_assert(NULL != rowreq_ctx); for(;requests; requests = requests->next) { /* * save old pointer, so we can free it if replaced */ old_string = requests->requestvb->val.string; dataFreeHook = requests->requestvb->dataFreeHook; if(NULL == requests->requestvb->val.string) { requests->requestvb->val.string = requests->requestvb->buf; requests->requestvb->val_len = sizeof(requests->requestvb->buf); } else if(requests->requestvb->buf == requests->requestvb->val.string) { if(requests->requestvb->val_len != sizeof(requests->requestvb->buf)) requests->requestvb->val_len = sizeof(requests->requestvb->buf); } /* * get column data */ tri = netsnmp_extract_table_info(requests); if(NULL == tri) continue; rc = _rdbmsRelTable_get_column(rowreq_ctx, requests->requestvb, tri->colnum); if(rc) { if(MFD_SKIP == rc) { requests->requestvb->type = ASN_PRIV_RETRY; rc = SNMP_ERR_NOERROR; } } else if (NULL == requests->requestvb->val.string) { snmp_log(LOG_ERR,"NULL varbind data pointer!\n"); rc = SNMP_ERR_GENERR; } if(rc) netsnmp_request_set_error(requests, SNMP_VALIDATE_ERR(rc)); /* * if the buffer wasn't used previously for the old data (i.e. it * was allcoated memory) and the get routine replaced the pointer, * we need to free the previous pointer. */ if(old_string && (old_string != requests->requestvb->buf) && (requests->requestvb->val.string != old_string)) { if(dataFreeHook) (*dataFreeHook)(old_string); else free(old_string); } } /* for results */ return SNMP_ERR_NOERROR; } /* _mfd_rdbmsRelTable_get_values */ /*********************************************************************** * * SET processing * ***********************************************************************/ /* * NOT APPLICABLE (per MIB or user setting) */ /*********************************************************************** * * DATA ACCESS * ***********************************************************************/ /** * @internal */ static int _cache_load(netsnmp_cache *cache, void *vmagic) { DEBUGMSGTL(("internal:rdbmsRelTable:_cache_load","called\n")); if((NULL == cache) || (NULL == cache->magic)) { snmp_log(LOG_ERR, "invalid cache for rdbmsRelTable_cache_load\n"); return -1; } /** should only be called for an invalid or expired cache */ netsnmp_assert((0 == cache->valid) || (1 == cache->expired)); /* * call user code */ return rdbmsRelTable_cache_load((netsnmp_container*)cache->magic); } /* _cache_load */ /** * @internal */ static void _cache_item_free(rdbmsRelTable_rowreq_ctx *rowreq_ctx, void *context) { DEBUGMSGTL(("internal:rdbmsRelTable:_cache_item_free","called\n")); if(NULL == rowreq_ctx) return; rdbmsRelTable_release_rowreq_ctx(rowreq_ctx); } /* _cache_item_free */ /** * @internal */ static void _cache_free(netsnmp_cache *cache, void *magic) { netsnmp_container *container; DEBUGMSGTL(("internal:rdbmsRelTable:_cache_free","called\n")); if((NULL == cache) || (NULL == cache->magic)) { snmp_log(LOG_ERR, "invalid cache in rdbmsRelTable_cache_free\n"); return; } container = (netsnmp_container*)cache->magic; /* * call user code */ rdbmsRelTable_cache_free(container); /* * free all items. inefficient, but easy. */ CONTAINER_CLEAR(container, (netsnmp_container_obj_func *)_cache_item_free, NULL); } /* _cache_free */ /** * @internal * initialize the iterator container with functions or wrappers */ void _rdbmsRelTable_container_init(rdbmsRelTable_interface_ctx *if_ctx) { DEBUGMSGTL(("internal:rdbmsRelTable:_rdbmsRelTable_container_init","called\n")); /* * set up the cache */ if_ctx->cache = netsnmp_cache_create(30, /* timeout in seconds */ _cache_load, _cache_free, rdbmsRelTable_oid, rdbmsRelTable_oid_size); if(NULL == if_ctx->cache) { snmp_log(LOG_ERR, "error creating cache for rdbmsRelTable\n"); return; } if_ctx->cache->flags = NETSNMP_CACHE_DONT_INVALIDATE_ON_SET; rdbmsRelTable_container_init(&if_ctx->container, if_ctx->cache); if(NULL == if_ctx->container) if_ctx->container = netsnmp_container_find("rdbmsRelTable:table_container"); if(NULL == if_ctx->container) { snmp_log(LOG_ERR,"error creating container in " "rdbmsRelTable_container_init\n"); return; } if_ctx->cache->magic = (void*)if_ctx->container; } /* _rdbmsRelTable_container_init */