Snmp_ex2_simple_standard_test报‘failed retrieving agent data’错误求助

我使用的SNMP测试模块snmp_ex2_simple_standard_test包含多个测试用例，为简化调试只保留了SNMP GET操作的测试逻辑，但执行时出现failed retrieving agent data错误，希望能得到解决建议。

排查操作与日志分析 #

• 在snmp_ex2_manager.erl中添加了snmpm:verbosity(all, info).，并为snmpm_config开启了dbg日志
• 日志分析结果：
  1. 测试用例针对代理127.0.1.1:161执行，调用snmpm_config:agent_info("127.0.1.1:161")时出现日志"SNMP M-SERVER INFO -- failed retrieving agent data for get:"
  2. 调用snmpm_config:agent_info(default_agent,all)可成功返回数据，default_agent是snmpm_config中通过-define(DEFAULT_TARGETNAME, default_agent).定义的默认代理
  3. 初步推测代理127.0.1.1:161未完成正确初始化

日志信息 #

Erlang/OTP 27 [DEVELOPMENT] [erts-14.1.1] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:1]

Eshell V14.1.1 (press Ctrl+G to abort, type help(). for help)
(node1@vm-alarm)1> dbg:tracer().
{ok,<0.93.0>}
(node1@vm-alarm)2> dbg:tpl(snmpm_config, agent_info, []).
{ok,[{matched,'node1@vm-alarm',4}]}
(node1@vm-alarm)3> dbg:p(all, c).
{ok,[{matched,'node1@vm-alarm',51}]}
(node1@vm-alarm)4> snmp_ex2_simple_standard_test:start().
(<0.103.0>) call snmpm_config:agent_info()
(<0.103.0>) call snmpm_config:agent_info(default_agent,all)
(<0.100.0>) call snmpm_config:agent_info()
(<0.100.0>) call snmpm_config:agent_info(default_agent,all)
snmpm:snmpm:mk_target_name(snmpUDPDomain, {{127,0,1,1},161}, [{community,
                                                               "public"}]) -> "127.0.1.1:161-v1".

(<0.103.0>) call snmpm_config:agent_info("127.0.1.1:161-v1",user_id)
(<0.103.0>) call snmpm_config:agent_info({"127.0.1.1:161-v1",user_id})
(<0.114.0>) call snmpm_config:agent_info({127,0,1,1},version)
(<0.114.0>) call snmpm_config:agent_info({{127,0,1,1},version})
*** [2024-02-09 21:59:58.372] SNMP M-SERVER INFO *** 
   failed retrieving agent data for get:
   TargetName: {127,0,1,1}
   Error:      {error,not_found}
ok

代码修改 #

为简化调试，修改了snmp_ex2_simple_standard_test:start/3函数，仅保留SNMP GET操作测试：

start(Mibs, AgentAddr, AgentConfig) ->
    Conf = [{mibs, Mibs}],
    {ok, _Pid} = snmp_ex2_manager:start_link(Conf),
    snmp_ex2_manager:agent(AgentAddr, AgentConfig),
    %%simple_standard_test(AgentAddr),
    %%simple_standard_test_ori(AgentAddr),
    g(AgentAddr, [1,3,6,1,2,1,1,1]), %%sysDescr
    %%g(AgentAddr, [1,3,6,1,2,1,11,1]), %%snmpInPkts
    snmp_ex2_manager:stop().

内容的提问来源于stack exchange，提问作者Bhuvan