[microblaze-uclinux] Net-SNMP AgentX

[Giulio Mazzoleni <giulio.mazzoleni@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi everybody,

I'm using net-snmp 5.2.1 bundled with petalinux.
I need to implement a custom mib and update some variables over time
based on custom logic.

I used to build a built-in mib in the main agent and interacted with it
via snmp set and get requests to update variables and retrieve the
updated data, but found that method a bit slow.

I discarded the use of shell scripts because it would be better to
integrate the code with a C program and I started to think about the use
of a custom subagent (agentx).

I built the net-snmp daemon with agentx module enabled and was able to
compile the subagent demo as per
http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_Subagent, but
trying to port it to PetaLinux I get a number of compile errors:
microblaze-uclinux-gcc
-L/home/marcoge/PetaLinux/software/petalinux-dist/lib -mno-xl-soft-mul
-mno-xl-soft-div -mxl-barrel-shift -mhard-float -mcpu=v6.00.b
`/home/marcoge/PetaLinux/software/petalinux-dist/user/net-snmp/build/net-snmp-config --libs` -L/home/marcoge/PetaLinux/software/petalinux-dist/user/net-snmp/build/snmplib/.libs -L/home/marcoge/PetaLinux/software/petalinux-dist/user/net-snmp/build/agent/.libs -L/home/marcoge/PetaLinux/software/petalinux-dist/user/net-snmp/build/agent/helpers/.libs -o microref main.o uart.o gps.o led.o utility.o snmp.o my_mib.o  -lnetsnmp -lnetsnmpagent -lnetsnmpmibs -lnetsnmphelpers -lpthread -lm
microref.elf2flt: In function `netsnmp_agent_add_list_data':
/home/marcoge/petalinux-svn/software/petalinux-dist/user/net-snmp/build/agent/../../agent/snmp_agent.c(.text+0x60720): undefined reference to `netsnmp_add_list_data'
microref.elf2flt: In function `netsnmp_agent_remove_list_data':
/home/marcoge/petalinux-svn/software/petalinux-dist/user/net-snmp/build/agent/../../agent/snmp_agent.c(.text+0x6075c): undefined reference to `netsnmp_remove_list_node'
microref.elf2flt: In function `netsnmp_agent_get_list_data':
/home/marcoge/petalinux-svn/software/petalinux-dist/user/net-snmp/build/agent/../../agent/snmp_agent.c(.text+0x60790): undefined reference to `netsnmp_get_list_data'
microref.elf2flt: In function `netsnmp_free_agent_data_set':
...

I'm attaching the Makefile I used in hope somebody else could confirm
the behaviour or tell me what I am doing wrong.

Was anybody able to extend the net-snmp under PetaLinux with a custom
subagent? Is there any other method I could use?

Many thanks for any help you could provide me.

Best regards,
Giulio Mazzoleni

------------------------------------------------

ifndef PETALINUX
$(error You must source the petalinux/settings.sh script before working
with PetaLinux)
endif

# Point to default PetaLinux root directory
ifndef ROOTDIR
ROOTDIR=$(PETALINUX)/software/petalinux-dist
endif

PATH:=$(PATH):$(ROOTDIR)/tools

UCLINUX_BUILD_USER = 1
-include $(ROOTDIR)/.config
-include $(ROOTDIR)/$(CONFIG_LINUXDIR)/.config
LIBCDIR = $(CONFIG_LIBCDIR)
-include $(ROOTDIR)/config.arch
ROMFSDIR=$(ROOTDIR)/romfs
ROMFSINST=$(ROOTDIR)/tools/romfs-inst.sh

NETSNMPCONFIG=$(ROOTDIR)/user/net-snmp/build/net-snmp-config

CFLAGS   += `$(NETSNMPCONFIG) --cflags` -I
$(ROOTDIR)/user/net-snmp/build/include -I
$(ROOTDIR)/user/net-snmp/include
LDFLAGS  += `$(NETSNMPCONFIG) --libs` -L
$(ROOTDIR)/user/net-snmp/build/snmplib/.libs -L
$(ROOTDIR)/user/net-snmp/build/agent/.libs -L
$(ROOTDIR)/user/net-snmp/build/agent/helpers/.libs
LDLIBS   += -lnetsnmp -lnetsnmpagent -lnetsnmpmibs -lnetsnmphelpers
-lpthread -lm

APP = example-demon

# Add any other object files to this list below
APP_OBJS = example-demon.o nstAgentSubagentObject.o

all: $(APP)

$(APP): $(APP_OBJS)
	$(CC) $(LDFLAGS) -o $@ $(APP_OBJS) $(LDLIBS)

clean:
	-rm -f $(APP) *.elf *.gdb *.o

romfs:
	$(ROMFSINST) $(APP) /bin/$(APP)

%.o: %.c
	$(CC) -c $(CFLAGS) -o $@ $<


# Targets for the required .config files - if they don't exist, the tree
isn't
# configured.  Tell the user this, how to fix it, and exit.
${ROOTDIR}/config.arch ${ROOTDIR}/.config:
	@echo "Error: You must configure the PetaLinux tree before compiling
your application"
	@echo ""
	@echo "Change directory to ../../petalinux-dist and 'make menuconfig'
or 'make xconfig'"
	@echo ""
	@echo "Once the tree is configured, return to this directory, and
re-run make."
	@echo ""
	@exit -1


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