net-snmp扩展table类型的私有mib

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 ::= BEGINIMPORTSMODULE-IDENTITY, OBJECT-TYPE, TimeTicks FROM SNMPv2-SMIDisplayString, FROM SNMPv2-TCenterprises			FROM 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 }END

2. 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 
#include 
#include 
#include "boardSlotTable.h"/** Initializes the boardSlotTable module */
void
init_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 */
void
initialize_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 */
void
boardSlotTable_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;elseprev->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 */
int
boardSlotTable_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 
#include 
#include 
#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 */
void
init_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 */
void
initialize_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´ÎÔö¼Óentry1 = 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 */
void
boardSlotTable_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;elseprev->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 */
int
boardSlotTable_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 install

6.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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