Install and configure ARECA Net-SNMP subagent

[Necessary files]

1. libarclibXX.so ( It depends on the platform and saved in the individual folder) 
2. areca.cpp
3. areca.h
4. commdef.h
5. interface.h
6. linux_comm.h
7. linux_ioctl.h
8. linux_pass_ioctl.h
9. Makefile
10. arcsnmp.conf

Because ARECA Net-SNMP subagent is originally written in C++, but Net-SNMP is C, 
so we should take some modifications before compilation our subagent into Net-SNMP.


[ Making and Installation ]

Step1: Copy all the necessary files to [NET-SNMP_ROOT]/agent/mibgroup/areca

Step2: Run [NET-SNMP_ROOT]./configure

Step3: Run [NET-SNMP_ROOT]/agent/mibgroup/areca/make

Step4: Edit ¡§Makefile¡¨ in the [NET-SNMP_ROOT]/agent/
       a. Add ¡§mibgroup/areca/[Folder_Of_OS]/[Folder_Of_Platform]/libarclibXX.so¡¨and¡§-lstdc++¡¨to the head of line of LOCAL_LIBS option .
       b. Add ¡§mibgroup/areca/areca.lo¡¨ string to the head of LMIBOBJS option line.
       c. Add ¡§mibgroup/areca/areca.o¡¨ string to the head of MIBOBJS option line.

Step5: Edit mib_module_includes.h in the [NET-SNMP_ROOT]/agent/mibgroup/
       a. Add the C statement of << #include ¡§mibgroup/areca/areca.h¡¨>> to the first line

Step6: Edit mib_module_inits.h in the [NET-SNMP_ROOT]/agent/mibgroup/
       a. Add the C statement of <<if(should_init(¡§areca¡¨)) init_areca() >> to the first line

Step7: Edit ¡§Makefile¡¨ in the [NET-SNMP_ROOT]/apps/
       a. Add ¡§../agent/mibgroup/areca/[Folder_For_Platform]/libarclibXX.so¡¨and¡§-lstdc++¡¨to the head of LOCAL_LIBS option line.

Step8: [NET-SNMP_ROOT]./make

Step9: [NET-SNMP_ROOT]./make install

Step10: Copy the snmpd and snmptrapd from /usr/local/sbin to /usr/sbin

Step11: Copy the arcsnmp.conf to /usr/local/share/snmp

Step12: Restart snmpd or snmptrapd

Note:  The "XX" of the shared-library name {libarclibXX.so} has to be replace with ¡§32¡¨ or ¡§64¡¨ depend on current platform.


[Configure the snmpd (option)]

Snmpd.conf is the configuration file which defines how the Net-SNMP SNMP agent operates.
1. Edit the snmpd.conf using ether ¡¥snmpconf¡¦ tool or by hand.
  a. Run snmpconf ¡Vg basic_setup
  b. Crafting a configuration by hand, if you don¡¦t need SNMP V3 this is fairly easy.
2. The rocommunity option of snmpd.conf is necessary for areca subagent.


[Reconfigure the snmpd]

Force the snmpd to reread its configuration files.
1. Send the signal SIGHUP to the snmpd process.
  a. Use ¡¥ps ¡Vax¡¦ to get the snmpd PID number
  b. Use ¡¥kill ¡VHUP snmpd_PID¡¦ to force snmpd ro reread.