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Net-SNMP的第一个agent实现

经过查找多方资料，终于成功让Net-SNMP的第一个agent运行起来，但尚有写问题没有明白，欢迎讨论：

作者：阿飞

完成时间：2007-7-22

Email：

Web：www.dearstock.com

参考：http://www.net-snmp.org/wiki/index.php/Tutorials

http://bbs.itgoal.com/viewthread.php?tid=2605

过程如下：

1，下载net-snmp的5.4版msi文件安装，默认路径C:\usr安装，安装过程中选择开发支持。

2，在VS2005上，新建C++ console工程SnmpServer，在工具->选项->VC++目录中，在“包含文件”，添加C:\usr\include ; 在“库文件”添加C:\usr\lib; 在项目属性的--连接器--输入--"附加依赖项"：添加netsnmp.lib netsnmpagent.lib netsnmphelpers.lib netsnmpmibs.lib netsnmptrapd.lib wsock32.lib；在“忽略特定库”中添加：msvcrt.lib。

建立一下3个文件：

example-demon.c

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <signal.h>

#include "nstAgentSubagentObject.h"

static int keep_running;

RETSIGTYPE
stop_server(int a) {
keep_running = 0;
}

int
main (int argc, char **argv) {
        //int agentx_subagent=1; /* change this if you want to be a SNMP master agent */
        int agentx_subagent=0;
        int background = 0; /* change this if you want to run in the background */
        int syslog = 0; /* change this if you want to use syslog */

        /* print log errors to syslog or stderr */
        if (syslog)
         ;
          //snmp_enable_calllog();
        else
          snmp_enable_stderrlog();

        /* we're an agentx subagent? */
        if (agentx_subagent) {
          /* make us a agentx client. */
          netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
        }

        /* run in background, if requested */
        if (background && netsnmp_daemonize(1, !syslog))
            exit(1);

/* initialize tcpip, if necessary */
SOCK_STARTUP;

/* initialize the agent library */
init_agent("example-demon");

/* initialize mib code here */

/* mib code: init_nstAgentSubagentObject from nstAgentSubagentObject.C */
init_nstAgentSubagentObject();

        /* initialize vacm/usm access control        */
        if (!agentx_subagent) {
            init_vacm_vars();
            init_usmUser();
        }

        /* example-demon will be used to read example-demon.conf files. */
        /*在这里读取一个example-demon.conf的配置文件，这是关键*/
        init_snmp("example-demon");

        /* If we're going to be a snmp master agent, initial the ports */
        if (!agentx_subagent)
          init_master_agent();        /* open the port to listen on (defaults to udp:161) */

        /* In case we recevie a request to stop (kill -TERM or kill -INT) */
        keep_running = 1;
        signal(SIGTERM, stop_server);
        signal(SIGINT, stop_server);

snmp_log(LOG_INFO,"example-demon is up and running.\n");

        /* your main loop here... */
        while(keep_running) {
          /* if you use select(), see snmp_select_info() in snmp_api(3) */
          /*           --- OR ---        */
          agent_check_and_process(1); /* 0 == don't block */
        }

        /* at shutdown time */
        snmp_shutdown("example-demon");
        SOCK_CLEANUP;

return 0;
}

nstAgentSubagentObject.h

/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.int_watch.conf,v 5.0 2002/04/20 07:30:13 hardaker Exp $
*/
#ifndef NSTAGENTSUBAGENTOBJECT_H
#define NSTAGENTSUBAGENTOBJECT_H

/*
* function declarations
*/
void init_nstAgentSubagentObject(void);

#endif /* NSTAGENTSUBAGENTOBJECT_H */

nstAgentSubagentObject.c

/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.int_watch.conf,v 5.0 2002/04/20 07:30:13 hardaker Exp $
*/

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "nstAgentSubagentObject.h"

/*
* the variable we want to tie an OID to. The agent will handle all
* * GET and SET requests to this variable changing it's value as needed.
*/

static int nstAgentSubagentObject = 6;

/*
* our initialization routine, automatically called by the agent
* (to get called, the function name must match init_FILENAME())
*/
void
init_nstAgentSubagentObject(void)
{
static oid nstAgentSubagentObject_oid[] =
{ 1, 3, 6, 1, 4, 1, 8072, 2, 4, 1, 1, 2, 0 };

          /*
           * a debugging statement.        Run the agent with -DnstAgentSubagentObject to see
           * the output of this debugging statement.
           */
          DEBUGMSGTL(("nstAgentSubagentObject",
                      "Initializing the nstAgentSubagentObject module\n"));

          /*
           * the line below registers our variables defined above as
           * accessible and makes it writable.        A read only version of any
           * of these registration would merely call
           * register_read_only_int_instance() instead.        The functions
           * called below should be consistent with your MIB, however.
           *
           * If we wanted a callback when the value was retrieved or set
           * (even though the details of doing this are handled for you),
           * you could change the NULL pointer below to a valid handler
           * function.
           */
          DEBUGMSGTL(("nstAgentSubagentObject",
                      "Initalizing nstAgentSubagentObject scalar integer.        Default value = %d\n",
                      nstAgentSubagentObject));

          netsnmp_register_int_instance("nstAgentSubagentObject",
                                        nstAgentSubagentObject_oid,
                                        OID_LENGTH(nstAgentSubagentObject_oid),
                                        &nstAgentSubagentObject, NULL);

DEBUGMSGTL(("nstAgentSubagentObject",
"Done initalizing nstAgentSubagentObject module\n"));
}
编译链接通过。

3，在C:\usr\etc'\snmp下建立example-demon.conf。内容如下：

#community 的读写根据需要设，
rwcommunity public
agentaddress 161

4，如果开启snmpd，先关闭。启动上面项目的可执行文件。

5，启动cmd，执行：

snmpget -v1 -c public localhost 1.3.6.1.4.1.8072.2.4.1.1

结果：NET-SNMP-MIB::netSnmp.2.4.1.1.2.0 = INTEGER: 6

snmpset -v1 -c public localhost 1.3.6.1.4.1.8072.2.4.1.1.2.0 i 5

结果：NET-SNMP-MIB::netSnmp.2.4.1.1.2.0 = INTEGER: 5

snmpget -v1 -c public localhost 1.3.6.1.4.1.8072.2.4.1.1.2.0

结果：NET-SNMP-MIB::netSnmp.2.4.1.1.2.0 = INTEGER: 5

问题；

1， SnmpServer.exe 怎么知道要去C:\usr\etc\snmp下早配置文件呢？

2， SnmpServer.exe 要用到C:\usr\bin\netsnmp.dll，这些都是怎么知道的呢？

http://hi.baidu.com/lieyu063/item/e00625c245ee2544a9ba94a0

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