net-snmp扩展table类型的私有mib
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注：本文介绍的是静态编译的方法扩展的私有mib，别的方法请看本人整理的《net-snmp agent开发（用net-snmp扩展MIB库）》
1. 首先创建一个简单的含有table变量的mib文件取名test.mib，后缀名也可以是.txt 实际操作没有区别；
TEST-DEVICE-MIB DEFINITIONS ::= BEGINIMPORTS MODULE-IDENTITY, OBJECT-TYPE, TimeTicks FROM SNMPv2-SMI DisplayString, FROM SNMPv2-TC enterprisesFROM RFC1155-SMI;test OBJECT IDENTIFIER ::= { enterprises 1000 }Device OBJECT IDENTIFIER ::= { test 1 } boardSlotTable OBJECT-TYPESYNTAX SEQUENCE OF BoardSlotEntryMAX-ACCESS not-accessibleSTATUS currentDESCRIPTION " Fan status description table "::= { Device 2 }boardSlotEntry OBJECT-TYPESYNTAX BoardSlotEntryMAX-ACCESS not-accessibleSTATUS currentDESCRIPTION " Boad status description table entry "INDEX { boardSlotID }::= { boardSlotTable 1}BoardSlotEntry::= SEQUENCE { boardSlotID INTEGER,boardType INTEGER,boardSeriesNumber DisplayString, }boardSlotID OBJECT-TYPESYNTAX INTEGERMAX-ACCESS read-onlySTATUS currentDESCRIPTION " Slot ID "::= { boardSlotEntry 1 }--add enum valueboardType OBJECT-TYPESYNTAX INTEGERMAX-ACCESS read-onlySTATUS currentDESCRIPTION " Slot Number "::= { boardSlotEntry 2 }boardSeriesNumber OBJECT-TYPESYNTAX DisplayString (SIZE (0..32))MAX-ACCESS read-onlySTATUS currentDESCRIPTION " Slot Series Number "::= { boardSlotEntry 3 }boardWorkMode OBJECT-TYPESYNTAX INTEGER{ normal (1), abnormal (2), offline (3) }MAX-ACCESS read-onlySTATUS currentDESCRIPTION " Board Status: normal (1), abnormal (2) and offline (3)"::= { boardSlotEntry 4 }END2. 将创建好的mib文件放入默认中，一般默认目录为/usr/local/net-snmp, 或者放到别的目录中，在配置文件snmpd.conf中增加mibs +/home//mibs/mytable test.mib，或者直接修改默认的mib路径。3.使用mib2c -c mib2c.iterate.conf TEST-DEVICE-MIB::boardSlotTable命令生成相应的.c和.h文件，选择1时提供一个缓存来提取数据，一定时间后将更新一次数据，2每次更新，选2生成的代码如下。如果该命令出错（ERROR: You don't have the SNMP perl module installed. Please obtain
this by getting the latest source release of the net-snmp toolkit from
http://www.net-snmp.org/download/ . Once you download the source and
unpack it, the perl module is contained in the perl/SNMP directory.
See the README file there for instructions.）请正常make make install重新安装net-snmp，原因未知。
/* * Note: this file originally auto-generated by mib2c using * $ */#include <net-snmp/net-snmp-config.h>#include <net-snmp/net-snmp-includes.h>#include <net-snmp/agent/net-snmp-agent-includes.h>#include "boardSlotTable.h"/** Initializes the boardSlotTable module */voidinit_boardSlotTable(void){ /* here we initialize all the tables we're planning on supporting */ initialize_table_boardSlotTable();} # Determine the first/last column names/** Initialize the boardSlotTable table by defining its contents and how it's structured */voidinitialize_table_boardSlotTable(void){ const oid boardSlotTable_oid[] = {1,3,6,1,4,1,1000,1,2}; const size_t boardSlotTable_oid_len = OID_LENGTH(boardSlotTable_oid); netsnmp_handler_registration *reg; netsnmp_iterator_info *iinfo; netsnmp_table_registration_info *table_info; DEBUGMSGTL(("boardSlotTable:init", "initializing table boardSlotTable\n")); reg = netsnmp_create_handler_registration( "boardSlotTable", boardSlotTable_handler, boardSlotTable_oid, boardSlotTable_oid_len, HANDLER_CAN_RONLY ); table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info ); netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER, /* index: boardSlotID */ 0); table_info->min_column = COLUMN_BOARDSLOTID; table_info->max_column = COLUMN_BOARDWORKMODE; iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info ); iinfo->get_first_data_point = boardSlotTable_get_first_data_point; iinfo->get_next_data_point = boardSlotTable_get_next_data_point; iinfo->table_reginfo = table_info; netsnmp_register_table_iterator( reg, iinfo ); /* Initialise the contents of the table here */} /* Typical data structure for a row entry */struct boardSlotTable_entry { /* Index values */ long boardSlotID; /* Column values */ long boardSlotID; long boardType; char boardSeriesNumber[NNN]; size_t boardSeriesNumber_len; long boardWorkMode; /* Illustrate using a simple linked list */ int valid; struct boardSlotTable_entry *next;};struct boardSlotTable_entry *boardSlotTable_head;/* create a new row in the (unsorted) table */struct boardSlotTable_entry *boardSlotTable_createEntry( long boardSlotID, ) { struct boardSlotTable_entry *entry; entry = SNMP_MALLOC_TYPEDEF(struct boardSlotTable_entry); if (!entry) return NULL; entry->boardSlotID = boardSlotID; entry->next = boardSlotTable_head; boardSlotTable_head = entry; return entry;}/* remove a row from the table */voidboardSlotTable_removeEntry( struct boardSlotTable_entry *entry ) { struct boardSlotTable_entry *ptr, *prev; if (!entry) return; /* Nothing to remove */ for ( ptr = boardSlotTable_head, prev = NULL; ptr != NULL; prev = ptr, ptr = ptr->next ) { if ( ptr == entry ) break; } if ( !ptr ) return; /* Can't find it */ if ( prev == NULL ) boardSlotTable_head = ptr->next; else prev->next = ptr->next; SNMP_FREE( entry ); /* XXX - release any other internal resources */}/* Example iterator hook routines - using 'get_next' to do most of the work */netsnmp_variable_list *boardSlotTable_get_first_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ *my_loop_context = boardSlotTable_head; return boardSlotTable_get_next_data_point(my_loop_context, my_data_context, put_index_data, mydata );}netsnmp_variable_list *boardSlotTable_get_next_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ struct boardSlotTable_entry *entry = (struct boardSlotTable_entry *)*my_loop_context; netsnmp_variable_list *idx = put_index_data; if ( entry ) { snmp_set_var_typed_integer( idx, ASN_INTEGER, entry->boardSlotID ); idx = idx->next_variable; *my_data_context = (void *)entry; *my_loop_context = (void *)entry->next; return put_index_data; } else { return NULL; }}/** handles requests for the boardSlotTable table */intboardSlotTable_handler( netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *reqinfo, netsnmp_request_info *requests) { netsnmp_request_info *request; netsnmp_table_request_info *table_info; struct boardSlotTable_entry *table_entry; DEBUGMSGTL(("boardSlotTable:handler", "Processing request (%d)\n", reqinfo->mode)); switch (reqinfo->mode) { /* * Read-support (also covers GetNext requests) */ case MODE_GET: for (request=requests; request; request=request->next) { table_entry = (struct boardSlotTable_entry *) netsnmp_extract_iterator_context(request); table_info = netsnmp_extract_table_info( request); switch (table_info->colnum) { case COLUMN_BOARDSLOTID: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER, table_entry->boardSlotID); break; case COLUMN_BOARDTYPE: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER, table_entry->boardType); break; case COLUMN_BOARDSERIESNUMBER: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->boardSeriesNumber, table_entry->boardSeriesNumber_len); break; case COLUMN_BOARDWORKMODE: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } default: netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHOBJECT); break; } } break; } return SNMP_ERR_NOERROR;}4. 修改后的.c文件如下/* * Note: this file originally auto-generated by mib2c using * $ */#include <net-snmp/net-snmp-config.h>#include <net-snmp/net-snmp-includes.h>#include <net-snmp/agent/net-snmp-agent-includes.h>#include "boardSlotTable.h"struct boardSlotTable_entry * boardSlotTable_createEntry( long boardSlotID, long boardType, char boardSeriesNumber[20], size_t boardSeriesNumber_len ); //ÉùÃ÷һϸú¯Êý/** Initializes the boardSlotTable module */voidinit_boardSlotTable(void){ /* here we initialize all the tables we're planning on supporting */ initialize_table_boardSlotTable();} //# Determine the first/last column names/** Initialize the boardSlotTable table by defining its contents and how it's structured */voidinitialize_table_boardSlotTable(void){ const oid boardSlotTable_oid[] = {1,3,6,1,4,1,1000,1,2}; const size_t boardSlotTable_oid_len = OID_LENGTH(boardSlotTable_oid); netsnmp_handler_registration *reg; netsnmp_iterator_info *iinfo; netsnmp_table_registration_info *table_info; DEBUGMSGTL(("boardSlotTable:init", "initializing table boardSlotTable\n")); reg = netsnmp_create_handler_registration( "boardSlotTable", boardSlotTable_handler, boardSlotTable_oid, boardSlotTable_oid_len, HANDLER_CAN_RONLY ); table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info ); netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER, /* index: boardSlotID */ 0); table_info->min_column = COLUMN_BOARDSLOTID; table_info->max_column = COLUMN_BOARDSERIESNUMBER; iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info ); iinfo->get_first_data_point = boardSlotTable_get_first_data_point; iinfo->get_next_data_point = boardSlotTable_get_next_data_point; iinfo->table_reginfo = table_info; netsnmp_register_table_iterator( reg, iinfo ); /* Initialise the contents of the table here */ boardSlotTable_createEntry(1,1,"1 1 1",sizeof("1 1 1"));//µÚÒ»¸öË÷ÒýÖµ¸³Öµ£¬±ØÐëÌí¼Ó} /* Typical data structure for a row entry */struct boardSlotTable_entry { /* Index values */ long boardSlotID; /* Column values */ long boardType; char boardSeriesNumber[20]; size_t boardSeriesNumber_len; /* Illustrate using a simple linked list */ int valid; struct boardSlotTable_entry *next;};struct boardSlotTable_entry *boardSlotTable_head;/* create a new row in the (unsorted) table */struct boardSlotTable_entry *boardSlotTable_createEntry( long boardSlotID, long boardType, char boardSeriesNumber[20], size_t boardSeriesNumber_len ) { struct boardSlotTable_entry *entry1; struct boardSlotTable_entry *entry2; struct boardSlotTable_entry *entry3; //ÉùÃ÷Èý¸öË÷Òý£¬ÉùÃ÷¶àµÄ¿ÉÒÔÒÀ´ÎÔö¼Ó entry1 = SNMP_MALLOC_TYPEDEF(struct boardSlotTable_entry); entry2 = SNMP_MALLOC_TYPEDEF(struct boardSlotTable_entry); entry3 = SNMP_MALLOC_TYPEDEF(struct boardSlotTable_entry); if (!entry1 || !entry2 || !entry3) return NULL; entry1->boardSlotID = boardSlotID; entry1->boardType = boardType; memcpy(entry1->boardSeriesNumber, boardSeriesNumber, boardSeriesNumber_len); entry1->boardSeriesNumber_len = boardSeriesNumber_len; entry2->boardSlotID = 2; entry2->boardType = 2; memcpy(entry2->boardSeriesNumber, "222", sizeof("222")); entry2->boardSeriesNumber_len = sizeof("222"); entry3->boardSlotID = 3; entry3->boardType = 3; memcpy(entry3->boardSeriesNumber, "333", sizeof("333")); entry3->boardSeriesNumber_len = sizeof("333"); entry1->next = entry2; entry2->next = entry3; entry3->next = boardSlotTable_head; boardSlotTable_head = entry1; return entry1;}/* remove a row from the table */voidboardSlotTable_removeEntry( struct boardSlotTable_entry *entry ) { struct boardSlotTable_entry *ptr, *prev; if (!entry) return; /* Nothing to remove */ for ( ptr = boardSlotTable_head, prev = NULL; ptr != NULL; prev = ptr, ptr = ptr->next ) { if ( ptr == entry ) break; } if ( !ptr ) return; /* Can't find it */ if ( prev == NULL ) boardSlotTable_head = ptr->next; else prev->next = ptr->next; SNMP_FREE( entry ); /* XXX - release any other internal resources */}/* Example iterator hook routines - using 'get_next' to do most of the work */netsnmp_variable_list *boardSlotTable_get_first_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ *my_loop_context = boardSlotTable_head; return boardSlotTable_get_next_data_point(my_loop_context, my_data_context, put_index_data, mydata );}netsnmp_variable_list *boardSlotTable_get_next_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ struct boardSlotTable_entry *entry = (struct boardSlotTable_entry *)*my_loop_context; netsnmp_variable_list *idx = put_index_data; if ( entry ) { snmp_set_var_typed_integer( idx, ASN_INTEGER, entry->boardSlotID ); idx = idx->next_variable; *my_data_context = (void *)entry; *my_loop_context = (void *)entry->next; return put_index_data; } else { return NULL; }}/** handles requests for the boardSlotTable table */intboardSlotTable_handler( netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *reqinfo, netsnmp_request_info *requests) { netsnmp_request_info *request; netsnmp_table_request_info *table_info; struct boardSlotTable_entry *table_entry; DEBUGMSGTL(("boardSlotTable:handler", "Processing request (%d)\n", reqinfo->mode)); switch (reqinfo->mode) { /* * Read-support (also covers GetNext requests) */ case MODE_GET: for (request=requests; request; request=request->next) { table_entry = (struct boardSlotTable_entry *) netsnmp_extract_iterator_context(request); table_info = netsnmp_extract_table_info( request); switch (table_info->colnum) { case COLUMN_BOARDSLOTID: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER, table_entry->boardSlotID); break; case COLUMN_BOARDTYPE: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER, table_entry->boardType); break; case COLUMN_BOARDSERIESNUMBER: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->boardSeriesNumber, table_entry->boardSeriesNumber_len); break; default: netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHOBJECT); break; } } break; } return SNMP_ERR_NOERROR;}5.然后把相应的.c和.h文件添加到net-snmp源码里的 agent/mibgroup路径下，在configure的时候添加 --with-mib-modules="boardSlotTable"选项，如果有多个table，则可以再mibgroup中创建一个文件夹例如testMIB文件夹，然后把相应的.c和.h文件都移到testMIB文件夹下，然后在mibgroup路径下新建一个test.h文件，添加config_require(testMIB/boardSlotTable);依次添加，编译的时候添加configure选项为--weith-mib-modules="test" 则可以一次全部编译；最后make make install6.输入命令则可以获取到相应数据
[root@localhost sbin]# snmpwalk -c public -v1 localhost .1.3.6.1.4.1.1000
SNMPv2-SMI::enterprises.1000.1.2.1.1.1 = INTEGER: 1
SNMPv2-SMI::enterprises.1000.1.2.1.1.2 = INTEGER: 2
SNMPv2-SMI::enterprises.1000.1.2.1.1.3 = INTEGER: 3
SNMPv2-SMI::enterprises.1000.1.2.1.2.1 = INTEGER: 1
SNMPv2-SMI::enterprises.1000.1.2.1.2.2 = INTEGER: 2
SNMPv2-SMI::enterprises.1000.1.2.1.2.3 = INTEGER: 3
SNMPv2-SMI::enterprises.1000.1.2.1.3.1 = Hex-STRING: 31 20 31 20 31 00
SNMPv2-SMI::enterprises.1000.1.2.1.3.2 = Hex-STRING: 32 32 32 00
SNMPv2-SMI::enterprises.1000.1.2.1.3.3 = Hex-STRING: 33 33 33 00
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