Net-snmp 使用c 扩展 sub-agent
摘要：
netSNMP开发，使用c开发对SNMP进行扩展，应用程序作为agent执行。
版本：NET-SNMP version 5.7.2.1
系统：CentOS X64
软件包：net-snmp-5.7.2.1.tar.gz
解压安装包：
[root@localhost snmp]# pwd
/root/snmp
[root@localhost snmp]# ls
net-snmp-5.7.2.1.tar.gz
[root@localhost snmp]# tarxzvf net-snmp-5.7.2.1.tar.gz
[root@localhost snmp]# ls
net-snmp-5.7.2.1 net-snmp-5.7.2.1.tar.gz
配置
[root@localhost snmp]# cdnet-snmp-5.7.2.1
[root@localhostnet-snmp-5.7.2.1]# pwd
/root/snmp/net-snmp-5.7.2.1
[root@localhostnet-snmp-5.7.2.1]# ./configure
配置完成后，会显示如下configure摘要信息
---------------------------------------------------------
Net-SNMP configuration summary:
---------------------------------------------------------
SNMP Versions Supported: 1 2c 3
Building for: linux
Net-SNMP Version: 5.7.2.1
Network transport support: Callback Unix Alias TCP UDP IPv4BaseSocketBase TCPBase UDPIPv4Base UDPBase
SNMPv3 Security Modules: usm
Agent MIB code: default_modules => snmpv3mibs mibII ucd_snmp notificationnotification-log-mib target agent_mibs agentx disman/event disman/scheduleutilities host
MYSQL Trap Logging: unavailable
Embedded Perl support: enabled
SNMP Perl modules: building -- embeddable
SNMP Python modules: disabled
Crypto support from: crypto
Authentication support: MD5 SHA1
Encryption support: DES AES
Local DNSSEC validation: disabled
编译、安装
make && make install
配置snmpd.conf
[root@localhost snmp]# pwd
/usr/local/share/snmp
[root@localhost snmp]#snmpconf
The following installedconfiguration files were found:
1: ./snmpd.conf
2: ./snmptrapd.conf
3: /usr/local/share/snmp/snmpd.conf
4: /usr/local/share/snmp/snmptrapd.conf
Would you like me to read themin? Their content will be merged withthe
output files created by thissession.
Valid answer examples:"all", "none","3","1,2,5"
Read in which (default = all): none
I can create the followingtypes of configuration files for you.
Select the file type you wishto create:
(you can create more than oneas you run this program)
1: snmpd.conf
2: snmptrapd.conf
3: snmp.conf
Other options: quit
Select File: 1
The configuration informationwhich can be put into snmpd.conf is divided
into sections. Select a configuration section for snmpd.conf
that you wish to create:
1: Access Control Setup
2: Extending the Agent
3: Trap Destinations
4: Monitor Various Aspects of the Running Host
5: Agent Operating Mode
6: System Information Setup
Other options: finished
Select section: 5
Section: Agent Operating Mode
Description:
This section defines how the agent willoperate when it
is running.
Select from:
1: Should the agent operate as a master agent or not.
2: The system user that the agent runs as.
3: The system group that the agent runs as.
4: The IP address and port number that the agent will listen on.
Other options: finished, list
Select section: 1
Configuring: master
Description:
Should the agent operate as a master agent ornot.
Currently, the only supported master agenttype for this token
is "agentx".
arguments: (on|yes|agentx|all|off|no)
Should the agent run as a AgentX masteragent?: agentx
Finished Output: master agentx
Section: Agent Operating Mode
Description:
This section defines how the agent willoperate when it
is running.
Select from:
1: Should the agent operate as a master agent or not.
2: The system user that the agent runs as.
3: The system group that the agent runs as.
4: The IP address and port number that the agent will listen on.
Other options: finished, list
Select section: finished
The configuration informationwhich can be put into snmpd.conf is divided
into sections. Select a configuration section for snmpd.conf
that you wish to create:
1: Access Control Setup
2: Extending the Agent
3: Trap Destinations
4: Monitor Various Aspects of the Running Host
5: Agent Operating Mode
6: System Information Setup
Other options: finished
Select section: 1
Section: Access Control Setup
Description:
This section defines who is allowed to talkto your running
snmp agent.
Select from:
1: aSNMPv3 read-write user
2: aSNMPv3 read-only user
3: aSNMPv1/SNMPv2c read-only access community name
4: aSNMPv1/SNMPv2c read-write access community name
Other options: finished, list
Select section: 3
Configuring: rocommunity
Description:
a SNMPv1/SNMPv2c read-only access communityname
arguments: community [default|hostname|network/bits] [oid]
The community name to add read-only accessfor: public
The hostname or networkaddress to accept this community name from [RETURN for all]:
The OID that this communityshould be restricted to [RETURN for no-restriction]:
Finished Output:rocommunity public
Section: Access Control Setup
Description:
This section defines who is allowed to talkto your running
snmp agent.
Select from:
1: aSNMPv3 read-write user
2: aSNMPv3 read-only user
3: aSNMPv1/SNMPv2c read-only access community name
4: aSNMPv1/SNMPv2c read-write access community name
Other options: finished, list
Select section: 4
Configuring: rwcommunity
Description:
a SNMPv1/SNMPv2c read-write access communityname
arguments: community [default|hostname|network/bits] [oid]
Enter the community name to add read-writeaccess for: private
The hostname or networkaddress to accept this community name from [RETURN for all]:
The OID that this communityshould be restricted to [RETURN for no-restriction]:
Finished Output:rwcommunity private
Section: Access Control Setup
Description:
This section defines who is allowed to talkto your running
snmp agent.
Select from:
1: aSNMPv3 read-write user
2: aSNMPv3 read-only user
3: aSNMPv1/SNMPv2c read-only access community name
4: aSNMPv1/SNMPv2c read-write access community name
Other options: finished, list
Select section: finished
The configuration informationwhich can be put into snmpd.conf is divided
into sections. Select a configuration section for snmpd.conf
that you wish to create:
1: Access Control Setup
2: Extending the Agent
3: Trap Destinations
4: Monitor Various Aspects of the Running Host
5: Agent Operating Mode
6: System Information Setup
Other options: finished
Selectsection: finished
I can create the followingtypes of configuration files for you.
Select the file type you wishto create:
(you can create more than oneas you run this program)
1: snmpd.conf
2: snmptrapd.conf
3: snmp.conf
Other options: quit
Select File: quit
Error: An snmpd.conf filealready exists in this directory.
'overwrite', 'skip', 'rename' or 'append'?: overwrite
The following files werecreated:
snmpd.conf
These files should be moved to /usr/local/share/snmp if you
want them used by everyone onthe system. In the future, if you add
the -i option to the commandline I'll copy them there automatically for you.
Or, if you want them for yourpersonal use only, copy them to
/root/.snmp . In the future, if you add the -p option tothe
command line I'll copy themthere automatically for you.
snmpd.conf配置文件
[root@localhost snmp]# pwd
/usr/local/share/snmp
[root@localhost snmp]# catsnmpd.conf
rocommunity public
rwcommunity private
master agentx
[root@localhost snmp]#
编写MIB文件
[root@localhost snmp_c]# pwd
/root/snmp/test/snmp_c
[root@localhost snmp_c]# catInspur-MIB.my
-- Inspur-MIB.my
Inspur-MIB DEFINITIONS ::= BEGIN
IMPORTS
OBJECT-GROUP, MODULE-COMPLIANCE,NOTIFICATION-GROUP
FROM SNMPv2-CONF
enterprises, Integer32, Unsigned32,OBJECT-TYPE, MODULE-IDENTITY,
NOTIFICATION-TYPE
FROM SNMPv2-SMI
DisplayString
FROM SNMPv2-TC;
-- October 09, 2002 at 14:50GMT
-- 1.3.6.1.4.1.37945
Test MODULE-IDENTITY
LAST-UPDATED"200210091450Z" -- October 09, 2002 at 14:50 GMT
ORGANIZATION
""
CONTACT-INFO
""
DESCRIPTION
"Video's Server MIB."
::= { enterprises 37945 }
-- Node definitions
-- This part will include alldetails about the Test.
-- 1.3.6.1.4.1.37945.1
Time OBJECT IDENTIFIER ::= { Test 1 }
-- 1.3.6.1.4.1.37945.1.1
GetTime OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..100))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Example : 2013/4/11"
::= { Time 1 }
END
-- Inspur-MIB.my
复制mib文件到指定目录
[root@localhost snmp_c]# cpInspur-MIB.my /usr/local/share/snmp/mibs/
测试mib文件
[root@localhost snmp_c]# snmptranslate-Tp -IR Inspur-MIB::Test
+--Test(37945)
|
+--Time(1)
|
+-- -R-- String GetTime(1)
Textual Convention:DisplayString
Size: 0..100
生成源码
[root@localhost snmp_c]# pwd
/root/snmp/test/snmp_c
[root@localhost snmp_c]# envMIBS="+/usr/local/share/snmp/mibs/Inspur-MIB.my" mib2c Test
writing to -
mib2c has multipleconfiguration files depending on the type of
code you need to write. You must pick one depending on your need.
You requested mib2c to be runon the following part of the MIB tree:
OID: Test
numeric translation: .1.3.6.1.4.1.37945
number of scalars within: 1
number of tables within: 0
number of notifications within: 0
First, do you want to generatecode that is compatible with the
ucd-snmp 4.X line of code, orcode for the newer Net-SNMP 5.X code
base (which provides a muchgreater choice of APIs to pick from):
1) ucd-snmp style code
2) Net-SNMP style code
Select your choice : 2
**********************************************************************
GENERATINGCODE FOR SCALAR OBJECTS:
**********************************************************************
It looks like you have some scalars in themib you requested, so I
will now generate code for them if youwish. You have two choices
for scalar API styles currently. Pick between them, or choose not
to generate any code for the scalars:
1) If you're writing code for some genericscalars
(by hand use: "mib2c -cmib2c.scalar.conf Test")
2) If you want to magically "tie"integer variables to integer
scalars
(by hand use: "mib2c -cmib2c.int_watch.conf Test")
3) Don't generate any code for the scalars
Select your choice: 1
using the mib2c.scalar.conf configurationfile to generate your code.
writing to Test.h
writing to Test.c
**********************************************************************
* NOTE WELL: The code generatedby mib2c is only a template. *YOU* *
* must fill in the code beforeit'll work most of the time. In many *
* cases, spots that MUST beedited within the files are marked with *
* /* XXX */ or /* TODO */comments. *
**********************************************************************
running indent on Test.h
running indent on Test.c
[root@localhost snmp_c]# ls
Inspur-MIB.my Test.c Test.h
修改测试程序Test.c
修改40-44行中的XXX：
case MODE_GET:
snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
"hello inspur"/* XXX: a pointer to the scalar's data */,
strlen("helloinspur")/* XXX: the length of the data in bytes */);
break;
编译测试程序
[root@localhost snmp_c]# pwd
/root/snmp/test/snmp_c
[root@localhost snmp_c]#net-snmp-config --compile-subagent Test Test.c
generating the temporary codefile: netsnmptmp.1981.c
void init_Test(void);
checking for init_Test inTest.c
init_Test(void)
checking for shutdown_Test inTest.c
running: gcc -fno-strict-aliasing -g -O2 -Ulinux-Dlinux=linux -D_REENTRANT -D_GNU_SOURCE-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/lib64/perl5/CORE -I.-I/usr/local/include -o Test netsnmptmp.1981.c Test.c -L/usr/local/lib-lnetsnmpmibs -lnetsnmpagent -lnetsnmp -lnetsnmpmibs -ldl -lnetsnmpagent -Wl,-E -Wl,-rpath,/usr/lib64/perl5/CORE-lnetsnmp -lrt -lcrypto
removing the temporary codefile: netsnmptmp.1981.c
subagent program Test created
开启另一个终端，启动snmpd服务
显示debug信息
[root@localhost snmp]# snmpd-f -Le -d
Turning on AgentX mastersupport.
NET-SNMP version 5.7.2.1
回到原来终端，执行测试程序
[root@localhost snmp_c]#./Test
[root@localhost snmp_c]# ps-ef|grep Test
root 2039 1 0 14:35 ? 00:00:00 ./Test
root 2041 1915 0 14:35 pts/0 00:00:00 grep Test
发送get请求
[root@localhost snmp_c]#snmpget -v2c -c public localhost .1.3.6.1.4.1.37945.1.1.0
SNMPv2-SMI::enterprises.37945.1.1.0= STRING: "hello inspur"
查看原来终端的debug信息
[root@localhost ~]# snmpd -Le -f -d
Turning on AgentX master support.
NET-SNMP version 5.7.2.1
Received 80 byte packet from Local IPC:/var/agentx/master
0000: 01 01 00 00 00 00 00 00 00 00 00 00 86 FB CA 1E ................
0016: 3C 00 00 00 00 00 00 00 05 04 00 00 01 00 00 00 <...............
0032: 88 1F 00 00 03 00 00 00 02 00 00 00 0A 00 00 00 ................
0048: 19 00 00 00 4E 65 74 2D 53 4E 4D 50 20 41 67 65 ....Net-SNMP Age
0064: 6E 74 58 20 73 75 62 2D 61 67 65 6E 74 00 00 00 ntX sub-agent...
Sending 88 bytes to Local IPC: /var/agentx/master
0000: 01 12 00 00 05 00 00 00 00 00 00 00 86 FB CA 1E ................
0016: 44 00 00 00 2B 03 00 00 00 00 00 00 04 00 00 00 D...+...........
0032: 05 04 00 00 01 00 00 00 88 1F 00 00 03 00 00 00 ................
0048: 02 00 00 00 0A 00 00 00 19 00 00 00 4E 65 74 2D ............Net-
0064: 53 4E 4D 50 20 41 67 65 6E 74 58 20 73 75 62 2D SNMP AgentX sub-
0080: 61 67 65 6E 74 00 00 00 agent...
Received 72 byte packet from Local IPC:/var/agentx/master
0000: 01 12 00 00 05 00 00 00 01 00 00 00 02 00 00 00 ................
0016: 34 00 00 00 00 00 00 00 00 00 00 00 04 00 00 00 4...............
0032: 05 04 00 00 01 00 00 00 39 94 00 00 01 00 00 00 ........9.......
0048: 01 00 00 00 00 00 00 00 0C 00 00 00 68 65 6C 6C ............hell
0064: 6F 20 69 6E 73 70 75 72 o inspur
Sending 58 bytes to UDP:[127.0.0.1]:37760->[127.0.0.1]:161
0000: 30 38 02 01 01 04 06 70 75 62 6C 69 63 A2 2B 02 08.....public.+.
0016: 04 39 99 34 1F 02 01 00 02 01 00 30 1D 30 1B 06 .9.4.......0.0..
0032: 0B 2B 06 01 04 01 82 A8 39 01 01 00 04 0C 68 65 .+......9.....he
0048: 6C 6C 6F 20 69 6E 73 70 75 72 llo inspur
http://blog.csdn.net/qq_27204267/article/category/6261728
http://www.cnblogs.com/shenlinken/p/5316021.html