netsnmp添加自定义表格MIB

本文为转载文章 转载地址为https://www.cnblogs.com/kiko2014551511/p/13370768.html
安装net-snmp见：【snmp】centos6.5安装和配置snmp5.7.1

net-snmp添加自定义MIB(标量)：【snmp】net-snmp添加自定义MIB(标量)

snmp 表格支持增删改查操作，比标量节点多了增删操作，那么为了实现增删操作，可以向表格增加一个RowStatus行状态类型的列，通过设置状态值对表格进行控制。

RowStatus状态值

状态 说明
active（1） 表明状态行是可用的
notInService（2） 表明行存在但不可用
notReady （3） 表明行存在，但因为缺少必要的信息而不能用
createAndGo （4） 由管理者设置，表明希望创建一个行并设置该行的状态列对象为active
createAndWait（5） 由管理者设置，表明希望创建一个行，但不可用，从上面的代码看到，是被设置为了notInService
destroy（6） 删除行

一、编写mib文件

使用MIB Builder生成MIB文件见：【snmp】使用MIB Builder生成MIB文件

注意

1、要有一个index索引节点，但是这个索引的名称不能为"index"，为"index"会报错，我这里索引名称是为"userIdx"

2、一般会设置最后一列为RowStatus列，实际使用时除了RowStatus对应的节点需要设置read-create，其他节点可以随便设置，但是在MIB Builder工具中设置了一列为read-create，其他列(除索引列)也要设置为read-create，否则会报错，因此请将表的各个节点均设置为read-create类型，后面我们再修改生成的MIB文件

生成的UserTable-MIB.my文件内容如下：

View Code

– UserTable-MIB.my
– MIB generated by MG-SOFT Visual MIB Builder Version 6.0 Build 88
– Thursday, August 06, 2020 at 14:12:31

UserTable-MIB DEFINITIONS ::= BEGIN

	IMPORTS
		OBJECT-GROUP			
			FROM SNMPv2-CONF			
		enterprises, Integer32, OBJECT-TYPE, MODULE-IDENTITY			
			FROM SNMPv2-SMI;


	-- 1.3.6.1.4.1.85
	myModule MODULE-IDENTITY 
		LAST-UPDATED "202008071136Z"		-- August 07, 2020 at 11:36 GMT
		ORGANIZATION 
			"Organization."
		CONTACT-INFO 
			"Contact-info."
		DESCRIPTION 
			"Description."
		::= { enterprises 85 }

–
– Node definitions

	-- 1.3.6.1.4.1.85.1
	user OBJECT IDENTIFIER ::= { myModule 1 }

	
	-- 1.3.6.1.4.1.85.1.1
	userTable OBJECT-TYPE
		SYNTAX SEQUENCE OF UserEntry
		MAX-ACCESS not-accessible
		STATUS current
		DESCRIPTION
			"Description."
		::= { user 1 }

	
	-- 1.3.6.1.4.1.85.1.1.1
	userEntry OBJECT-TYPE
		SYNTAX UserEntry
		MAX-ACCESS not-accessible
		STATUS current
		DESCRIPTION
			"Description."
		INDEX { userIdx }
		::= { userTable 1 }

	
	UserEntry ::=
		SEQUENCE { 
			userIdx
				Integer32,
			userName
				Integer32,
			userAge
				Integer32,
			userRowStatus
				Integer32
		 }

	-- 1.3.6.1.4.1.85.1.1.1.1
	userIdx OBJECT-TYPE
		SYNTAX Integer32 (1..1000)
		MAX-ACCESS read-only
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 1 }

	
	-- 1.3.6.1.4.1.85.1.1.1.2
	userName OBJECT-TYPE
		SYNTAX Integer32
		MAX-ACCESS read-create
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 2 }

	
	-- 1.3.6.1.4.1.85.1.1.1.3
	userAge OBJECT-TYPE
		SYNTAX Integer32
		MAX-ACCESS read-create
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 3 }

	
	-- 1.3.6.1.4.1.85.1.1.1.4
	userRowStatus OBJECT-TYPE
		SYNTAX Integer32
		MAX-ACCESS read-create
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 4 }

	
	-- 1.3.6.1.4.1.85.1.3
	userGroup OBJECT-GROUP
		OBJECTS { userIdx, userName, userAge, userRowStatus }
		STATUS current
		DESCRIPTION 
			"Description."
		::= { user 3 }

	

END

–
– UserTable-MIB.

修改后的MIB文件，有中文注释是修改的地方：

复制代码

– UserTable-MIB.my
– MIB generated by MG-SOFT Visual MIB Builder Version 6.0 Build 88
– Thursday, August 06, 2020 at 14:12:31

UserTable-MIB DEFINITIONS ::= BEGIN

	IMPORTS
		OBJECT-GROUP			
			FROM SNMPv2-CONF			
		enterprises, Integer32, OBJECT-TYPE, MODULE-IDENTITY			
			FROM SNMPv2-SMI      -- 去掉原来的分号
		DisplayString, RowStatus -- 增加这一行
            FROM SNMPv2-TC;      -- 增加这一行


	-- 1.3.6.1.4.1.85
	myModule MODULE-IDENTITY 
		LAST-UPDATED "202008071136Z"		-- August 07, 2020 at 11:36 GMT
		ORGANIZATION 
			"Organization."
		CONTACT-INFO 
			"Contact-info."
		DESCRIPTION 
			"Description."
		::= { enterprises 85 }

–
– Node definitions

	-- 1.3.6.1.4.1.85.1
	user OBJECT IDENTIFIER ::= { myModule 1 }

	
	-- 1.3.6.1.4.1.85.1.1
	userTable OBJECT-TYPE
		SYNTAX SEQUENCE OF UserEntry
		MAX-ACCESS read-create  -- 修改类型为read-create
		STATUS current
		DESCRIPTION
			"Description."
		::= { user 1 }

	
	-- 1.3.6.1.4.1.85.1.1.1
	userEntry OBJECT-TYPE
		SYNTAX UserEntry
		MAX-ACCESS read-create  -- 修改类型为read-create
		STATUS current
		DESCRIPTION
			"Description."
		INDEX { userIdx }
		::= { userTable 1 }

	
	UserEntry ::=
		SEQUENCE { 
			userIdx
				Integer32,
			userName
				OCTET STRING,
			userAge
				Integer32,
			userRowStatus
				RowStatus      -- 修改类型为RowStatus
		 }

	-- 1.3.6.1.4.1.85.1.1.1.1
	userIdx OBJECT-TYPE
		SYNTAX Integer32 (1..1000)
		MAX-ACCESS read-only   -- 根据实际业务修改类型
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 1 }

	
	-- 1.3.6.1.4.1.85.1.1.1.2
	userName OBJECT-TYPE
		SYNTAX OCTET STRING
		MAX-ACCESS read-write  -- 根据实际业务修改类型
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 2 }

	
	-- 1.3.6.1.4.1.85.1.1.1.3
	userAge OBJECT-TYPE
		SYNTAX Integer32
		MAX-ACCESS read-write  -- 根据实际业务修改类型
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 3 }

	
	-- 1.3.6.1.4.1.85.1.1.1.4
	userRowStatus OBJECT-TYPE
		SYNTAX RowStatus       -- 修改为RowStatus
		MAX-ACCESS read-create
		STATUS current
		DESCRIPTION
			"Description."
		::= { userEntry 4 }

	-- OBJECT-GROUP可以不要
	-- 1.3.6.1.4.1.85.1.3
	-- userGroup OBJECT-GROUP
	-- 	OBJECTS { userIdx, userName, userAge, userRowStatus }
	--	STATUS current
	--	DESCRIPTION 
	--		"Description."
	--	::= { user 3 }

	

END

–
– UserTable-MIB.my

复制代码

二、使用mib2c命令生成.c和.h文件

上传UserTable-MIB.my到linux机器的/usr/local/snmp/share/snmp/mibs目录下

1、使用如下命令查看文件格式是否正确

/usr/local/snmp/bin/snmptranslate -Tp -IR UserTable-MIB::myModule

可以看到userRowStatus节点（也就是RowStatus列）所支持的状态值

2、执行如下命令生成表格文件

env MIBS=“+/usr/local/snmp/share/snmp/mibs/UserTable-MIB.my” /usr/local/snmp/bin/mib2c -c mib2c.iterate.conf UserTable-MIB::myModule

以上命令执行完后会生成myModule.h和myModule.c文件

生成的原代码(myModule.c文件)：

View Code

需要对myModule.c文件进行修改，修改后的文件如下(有中文注释的地方就是修改的地方)：

复制代码
/*

• 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 “myModule.h”

/** Initializes the myModule module /
void
init_myModule(void)
{
/
* here we initialize all the tables we’re planning on supporting
*/
initialize_table_userTable();
}

// 注释下面这行
// # Determine the first/last column names

/** Initialize the userTable table by defining its contents and how it’s structured */
void
initialize_table_userTable(void)
{
const oid userTable_oid[] = { 1, 3, 6, 1, 4, 1, 85, 1, 1 };
const size_t userTable_oid_len = OID_LENGTH(userTable_oid);
netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;

DEBUGMSGTL(("myModule:init", "initializing table userTable\n"));

reg =
    netsnmp_create_handler_registration("userTable", userTable_handler,
                                        userTable_oid,
                                        userTable_oid_len,
                                        HANDLER_CAN_RWRITE);

table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER,   /* index: userIdx */
                                 0);
table_info->min_column = COLUMN_USERIDX;
table_info->max_column = COLUMN_USERROWSTATUS;

iinfo = SNMP_MALLOC_TYPEDEF(netsnmp_iterator_info);
iinfo->get_first_data_point = userTable_get_first_data_point;
iinfo->get_next_data_point = userTable_get_next_data_point;
iinfo->table_reginfo = table_info;

netsnmp_register_table_iterator(reg, iinfo);
netsnmp_inject_handler_before(reg,
                              netsnmp_get_cache_handler
                              (USERTABLE_TIMEOUT, userTable_load,
                               userTable_free, userTable_oid,
                               userTable_oid_len),
                              TABLE_ITERATOR_NAME);

/*
 * Initialise the contents of the table here 
 */

}

#define NNN 256 //定义这个宏，下面这个结构体用到

/*
 * Typical data structure for a row entry 
 */

struct userTable_entry {
/*
* Index values
*/
long userIdx;

/*
 * Column values 
 */
// long            userIdx; //注释掉，上面已经定义了
char            userName[NNN];
size_t          userName_len;
char            old_userName[NNN];
size_t          old_userName_len;
long            userAge;
long            old_userAge;
long            userRowStatus;

/*
 * Illustrate using a simple linked list 
 */
int             valid;
struct userTable_entry *next;

};

struct userTable_entry *userTable_head;

/*

• create a new row in the (unsorted) table
  */
  //补全这个函数的参数，其实就是表格中那四列的内容
  //这个函数就是添加一行数据的函数，RowStatus列不传也可以，程序内部会自动处理
  struct userTable_entry *
  userTable_createEntry(long userIdx,char *userName ,size_t userName_len,long userAge)
  {
  struct userTable_entry *entry;

  entry = SNMP_MALLOC_TYPEDEF(struct userTable_entry);
  if (!entry)
  return NULL;

  entry->userIdx = userIdx;
  snprintf(entry->userName, sizeof(entry->userName), “%s”, userName); //将userName数据赋给结构体
  entry->userName_len = userName_len; //将userName_len数据赋给结构体
  entry->userAge = userAge; //将userAge数据赋值给结构体

  entry->next = userTable_head;
  userTable_head = entry;
  return entry;
  }

/*

• remove a row from the table
  */
  void
  userTable_removeEntry(struct userTable_entry *entry)
  {
  struct userTable_entry *ptr, *prev;

  if (!entry)
  return; /* Nothing to remove */

  for (ptr = userTable_head, prev = NULL;
  ptr != NULL; prev = ptr, ptr = ptr->next) {
  if (ptr == entry)
  break;
  }
  if (!ptr)
  return; /* Can’t find it */

  if (prev == NULL)
  userTable_head = ptr->next;
  else
  prev->next = ptr->next;

  SNMP_FREE(entry); /* XXX - release any other internal resources */
  }

#define STRMAX 1024 //定义宏
/*

• Example cache handling - set up linked list from a suitable file
  */
  int
  userTable_load(netsnmp_cache * cache, void *vmagic)
  {
  FILE *fp;
  struct userTable_entry *this;
  char buf[STRMAX];

  /*

  • The basic load routine template assumes that the data to
  • be reported is held in a file - with one row of the file
  • for each row of the table.
  • If your data is available via a different API, you
  • should amend this initial block (and the control of the
  • ‘while’ loop) accordingly.
  • ‘XXX’ marks where the template is incomplete and
  • code will definitely need to be added.
    */

  fp = fopen(“/data/for/userTable”, “r”);
  if (!fp) {
  return -1;
  }
  while (fgets(buf, STRMAX, fp)) {
  this = SNMP_MALLOC_TYPEDEF(struct userTable_entry);
  /*
  * XXX - Unpick ‘buf’ to extract the individual field values
  * and then populate the ‘this’ data structure with them
  */

   this->next = userTable_head;
   userTable_head = this;  /* Iterate helper is fine with unordered lists! */
  

  }
  fclose(fp);
  return 0; /* OK */
  }

void
userTable_free(netsnmp_cache * cache, void *vmagic)
{
struct userTable_entry *this, *that;

for (this = userTable_head; this; this = that) {
    that = this->next;
    SNMP_FREE(this);        /* XXX - release any other internal resources */
}
userTable_head = NULL;

}

/*

• Example iterator hook routines - using ‘get_next’ to do most of the work
  */
  netsnmp_variable_list *
  userTable_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 = userTable_head;
  return userTable_get_next_data_point(my_loop_context, my_data_context,
  put_index_data, mydata);
  }

netsnmp_variable_list *
userTable_get_next_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list * put_index_data,
netsnmp_iterator_info *mydata)
{
struct userTable_entry *entry =
(struct userTable_entry *) *my_loop_context;
netsnmp_variable_list *idx = put_index_data;

if (entry) {
    snmp_set_var_typed_integer(idx, ASN_INTEGER, entry->userIdx);
    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 userTable table */
int
userTable_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 userTable_entry *table_entry;
struct userTable_entry *table_row; //这个变量未定义
int ret; //变量未定义

DEBUGMSGTL(("myModule: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 userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERIDX:
            if (!table_entry) {
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHINSTANCE);
                continue;
            }
            snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
                                       table_entry->userIdx);
            break;
        case COLUMN_USERNAME:
            if (!table_entry) {
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHINSTANCE);
                continue;
            }
            snmp_set_var_typed_value(request->requestvb, ASN_OCTET_STR,
                                     table_entry->userName,
                                     table_entry->userName_len);
            break;
        case COLUMN_USERAGE:
            if (!table_entry) {
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHINSTANCE);
                continue;
            }
            snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
                                       table_entry->userAge);
            break;
        case COLUMN_USERROWSTATUS:
            if (!table_entry) {
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHINSTANCE);
                continue;
            }
            snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
                                       table_entry->userRowStatus);
            break;
        default:
            netsnmp_set_request_error(reqinfo, request,
                                      SNMP_NOSUCHOBJECT);
            break;
        }
    }
    break;

    /*
     * Write-support
     */
case MODE_SET_RESERVE1:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERNAME:
            /*
             * or possibly 'netsnmp_check_vb_type_and_size' 
             */
            ret =
                netsnmp_check_vb_type_and_max_size(request->requestvb,
                                                   ASN_OCTET_STR,
                                                   sizeof(table_entry->
                                                          userName));
            if (ret != SNMP_ERR_NOERROR) {
                netsnmp_set_request_error(reqinfo, request, ret);
                return SNMP_ERR_NOERROR;
            }
            break;
        case COLUMN_USERAGE:
            /*
             * or possibly 'netsnmp_check_vb_int_range' 
             */
            ret = netsnmp_check_vb_int(request->requestvb);
            if (ret != SNMP_ERR_NOERROR) {
                netsnmp_set_request_error(reqinfo, request, ret);
                return SNMP_ERR_NOERROR;
            }
            break;
        case COLUMN_USERROWSTATUS:
            ret = netsnmp_check_vb_rowstatus(request->requestvb,
                                             (table_entry ? RS_ACTIVE :
                                              RS_NONEXISTENT));
            if (ret != SNMP_ERR_NOERROR) {
                netsnmp_set_request_error(reqinfo, request, ret);
                return SNMP_ERR_NOERROR;
            }
            break;
        default:
            netsnmp_set_request_error(reqinfo, request,
                                      SNMP_ERR_NOTWRITABLE);
            return SNMP_ERR_NOERROR;
        }
    }
    break;

case MODE_SET_RESERVE2:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERROWSTATUS:
            switch (*request->requestvb->val.integer) {
            case RS_CREATEANDGO:
            case RS_CREATEANDWAIT:
                table_row =
                    userTable_createEntry(*table_info->indexes->val.integer,"",0,0); //补全，这里是创建一个新的行
                if (table_row) {
                    netsnmp_insert_iterator_context(request,
                                                    table_row);
                } else {
                    netsnmp_set_request_error(reqinfo, request,
                                              SNMP_ERR_RESOURCEUNAVAILABLE);
                    return SNMP_ERR_NOERROR;
                }
            }
        }
    }
    break;

case MODE_SET_FREE:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERROWSTATUS:
            switch (*request->requestvb->val.integer) {
            case RS_CREATEANDGO:
            case RS_CREATEANDWAIT:
                if (table_entry && !table_entry->valid) {
                    userTable_removeEntry(table_row); //多传了table_data参数,删除
                }
            }
        }
    }
    break;

case MODE_SET_ACTION:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERNAME:
            memcpy(table_entry->old_userName,
                   table_entry->userName,
                   sizeof(table_entry->userName));
            table_entry->old_userName_len = table_entry->userName_len;
            memset(table_entry->userName, 0,
                   sizeof(table_entry->userName));
            memcpy(table_entry->userName,
                   request->requestvb->val.string,
                   request->requestvb->val_len);
            table_entry->userName_len = request->requestvb->val_len;
            break;
        case COLUMN_USERAGE:
            table_entry->old_userAge = table_entry->userAge;
            table_entry->userAge = *request->requestvb->val.integer;
            break;
        }
    }
    /*
     * Check the internal consistency of an active row 
     */
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERROWSTATUS:
            switch (*request->requestvb->val.integer) {
            case RS_ACTIVE:
            case RS_CREATEANDGO:
                if ( 0/* 出错条件 */ ) {
                    netsnmp_set_request_error(reqinfo, request,
                                              SNMP_ERR_INCONSISTENTVALUE);
                    return SNMP_ERR_NOERROR;
                }
            }
        }
    }
    break;

case MODE_SET_UNDO:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERNAME:
            memcpy(table_entry->userName,
                   table_entry->old_userName,
                   sizeof(table_entry->userName));
            memset(table_entry->old_userName, 0,
                   sizeof(table_entry->userName));
            table_entry->userName_len = table_entry->old_userName_len;
            break;
        case COLUMN_USERAGE:
            table_entry->userAge = table_entry->old_userAge;
            table_entry->old_userAge = 0;
            break;
        case COLUMN_USERROWSTATUS:
            switch (*request->requestvb->val.integer) {
            case RS_CREATEANDGO:
            case RS_CREATEANDWAIT:
                if (table_entry && !table_entry->valid) {
                    userTable_removeEntry(table_row); //多传了table_data参数,删除
                }
            }
            break;
        }
    }
    break;

case MODE_SET_COMMIT:
    for (request = requests; request; request = request->next) {
        table_entry = (struct userTable_entry *)
            netsnmp_extract_iterator_context(request);
        table_info = netsnmp_extract_table_info(request);

        switch (table_info->colnum) {
        case COLUMN_USERROWSTATUS:
            switch (*request->requestvb->val.integer) {
            case RS_CREATEANDGO:
                table_entry->valid = 1;
                /*
                 * Fall-through 
                 */
            case RS_ACTIVE:
                table_entry->userRowStatus = RS_ACTIVE;
                break;

            case RS_CREATEANDWAIT:
                table_entry->valid = 1;
                /*
                 * Fall-through 
                 */
            case RS_NOTINSERVICE:
                table_entry->userRowStatus = RS_NOTINSERVICE;
                break;

            case RS_DESTROY:
                userTable_removeEntry(table_entry); //修改table_row为table_entry,否则删除行不成功, 多传了table_data参数,删除
            }
        }
    }
    break;
}
return SNMP_ERR_NOERROR;

}
复制代码

三、载入自定义的MIB库

1、将myModule.h 和修改后的myModule.c文件复制到linux机器的net-snmp-5.7.1/agent/mibgroup/目录下

2、如果snmp服务在运行，停止snmp服务

3、在/root/net-snmp-5.7.1目录下依次执行下面3个命令编译安装

./configure --prefix=/usr/local/snmp --with-mib-modules=“myModule”

make

make install

四、测试

1、执行/usr/local/snmp/sbin/snmpd -c /usr/local/snmp/etc/snmpd.conf 命令启动snmp服务

2、执行/usr/local/snmp/bin/snmpwalk -v 2c -c public localhost 1.3.6.1.4.1.85.1.1查看表格内容，可以看到表里什么都没有

3、添加第一行数据：/usr/local/snmp/bin/snmpset -v 2c -c public localhost 1.3.6.1.4.1.85.1.1.1.4.1 i 4

这个命令表示对表的第一行的第三列设置值为4，因为第三列为RowStatus类型，所以系统会创建这一行

（表中原本是没有第一行的，只要对第一行的RowStatus列写入4就可以创建这一行）

4、修改第一行数据中的userName字段：/usr/local/snmp/bin/snmpset -v 2c -c public localhost 1.3.6.1.4.1.85.1.1.1.2.1 s harara

5、修改第一行数据中的userAge字段：/usr/local/snmp/bin/snmpset -v 2c -c public localhost 1.3.6.1.4.1.85.1.1.1.3.1 i 24

6、删除第1行，对第1行的第4列写入6即可：/usr/local/snmp/bin/snmpset -v 2c -c public localhost 1.3.6.1.4.1.85.1.1.1.4.1 i 6