AgentX in windows (netsnmp 5.2.1.2 + example-demon)

permalink · #1 (**permalink**) 09-18-2005

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Hi,=20
I wrote a subAgent for Linux, it works just fine,=20
When I was asked to add support for Windows server 2003 too, I had a=20
lot of problems. I am asking you for help please:=20

After applying some patches, I installed net-snmp 5.2.1.2
<http://5.2.1.2>in my windows
machine using cygwin, using those steps:=20
1. configure --with-mib-modules=3D"host agentx disman/event-mib=20
examples/example" --with-out-mib-modules=3Dhost/hr_net=20
work=20
2. make=20
3. make install=20

OK.. Now I am trying to compile example-demon (form agentx tutorial=20
from net-snmp official site).=20
I am running the snmpd:=20
c:\usr\bin\snmpd -f -L -c c:\usr\share\snmp\snmpd.conf -x localhost:705=20
-Dagentx=20
snmpd.conf looks like this:=20
################################################## #########=20
# SECTION: Access Control Setup=20
rwuser root=20
rouser root=20
rwcommunity public=20
master agentx=20
# end of snmpd.conf=20
################################################## ###=20

snmpd output is:=20
"""=20
c:\usr\share\snmp\snmpd.conf -Dagentx=20
agentx/subagent: init_subagent sess 00325ea0=20
agentx_register_app_config_handler: registering .conf token for=20
"agentxsocket"=20
agentx_register_app_config_handler: registering .conf token for=20
"agentxperms"=20
agentx_register_app_config_handler: registering .conf token for=20
"agentxRetries"=20
agentx_register_app_config_handler: registering .conf token for=20
"agentxTimeout"=20
Turning on AgentX master support.=20
agentx/master: initializing...=20
agentx/master: initializing... DONE=20
NET-SNMP version 5.2.1.2 <http://5.2.1.2>=20
"""=20

Then I opened a cygwin window and compiled example-demon.c, here is the=20
code:=20
##############=20
# example-demon.c=20
#include <net-snmp/net-snmp-config.h>=20
#include <net-snmp/net-snmp-includes.h>=20
#include <net-snmp/agent/net-snmp-agent-includes.h>=20
#include <signal.h>=20

#include <nstAgentSubagentObject.h>=20

static int keep_running;=20

RETSIGTYPE=20
stop_server(int a) {=20
keep_running =3D 0;=20

}=20

int=20
main (int argc, char **argv) {=20
int agentx_subagent=3D1; /* change this if you want to be a SNMP master=20
agent */=20
int background =3D 0; /* change this if you want to run in the=20
background */=20
int syslog =3D 0; /* change this if you want to use syslog */=20

/* print log errors to syslog or stderr */=20
if (syslog)=20
snmp_enable_calllog();=20
else=20
snmp_enable_stderrlog();=20

/* we're an agentx subagent? */=20
if (agentx_subagent) {=20
/* make us a agentx client. */=20
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,= 20
NETSNMP_DS_AGENT_ROLE, 1);=20
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,NE TSNMP_DS_AGENT_X_SOCKET,"=
=ADlocalhost:705");

}=20

/* run in background, if requested */=20
if (background && netsnmp_daemonize(1, !syslog))=20
exit(1);=20
/* initialize tcpip, if necessary */=20
SOCK_STARTUP;=20

/* initialize the agent library */=20
init_agent("example-demon");=20

/* initialize mib code here */=20

/* mib code: init_nstAgentSubagentObject from=20
nstAgentSubagentObject.C */=20
init_nstAgentSubagentObject();=20

/* initialize vacm/usm access control */=20
if (!agentx_subagent) {=20
init_vacm_vars();=20
init_usmUser();=20
}=20

/* example-demon will be used to read example-demon.conf files. */=20
init_snmp("example-demon");=20

/* If we're going to be a snmp master agent, initial the ports */=20
if (!agentx_subagent)=20
init_master_agent(); /* open the port to listen on (defaults to=20
udp:161) */=20

/* In case we recevie a request to stop (kill -TERM or kill -INT) */=20
keep_running =3D 1;=20
signal(SIGTERM, stop_server);=20
signal(SIGINT, stop_server);=20

snmp_log(LOG_INFO,"example-demon is up and running.\n");=20

/* your main loop here... */=20
while(keep_running) {=20
/* if you use select(), see snmp_select_info() in snmp_api(3) */=20
/* --- OR --- */=20
agent_check_and_process(1); /* 0 =3D=3D don't block */=20
}=20

/* at shutdown time */=20
snmp_shutdown("example-demon");=20
SOCK_CLEANUP;=20

return 0;=20

}=20

# end of example-demon.c=20
######################=20

Then I ran example-demon.exe, it says that "example-demon is up and=20
running"!!!!!=20

BUT, when I check the subagent's MIB it seems not working:=20
c:\snmpget -v 2c -c public localhost=20
NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0=20
=3D=3D> NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 =3D No Such Object=
=20
available on this agent at this OID=20

!!!!!!!=20

I spent some days trying to figure it out, I couldn't. Can you please=20
help me.=20

P.S=20
1. netstat -a shows me "TCP pc_name:705 pc_name:0 LISTENING"=20
2. When I try to run the example-demon without running the master, I=20
got the same behavior, it says that it's up and running!!, but in fact=20
it's not.=20
3. I am running snmpd and example-demon from MS window (not form cygwin=20
window), I don't know if that's matter.=20

Thanks in advance.=20
-Ali

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Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

Hi, I wrote a subAgent for Linux, it works just fine, When I was=
asked to add support for Windows server 2003 too, I had a lot of probl=
ems. I am asking you for help please: 
 After applying some patches, I installed net-snmp <a href=3D"http://=
5.2.1.2">5.2.1.2</a> in my windows machine using cygwin, using those st=
eps: 1. configure --with-mib-modules=3D"host agentx disman/event-m=
ib=20
 examples/example" --with-out-mib-modules=3Dhost/hr_net work <b=
r>2. make 3. make install 
 OK.. Now I am trying to compile example-demon (form agentx tutorial =
 from net-snmp official site). I am running the snmpd: c:\usr\bi=
n\snmpd -f -L -c c:\usr\share\snmp\snmpd.conf -x localhost:705 -Dagentx=
=20
 snmpd.conf looks like this: #######################################=
#################### # SECTION: Access Control Setup rwuser  r=
oot rouser  root rwcommunity  public master agentx <b=
r># end of=20
snmpd.conf ############################################## ####### 
 snmpd output is: """ c:\usr\share\snmp\snmpd.=
conf  -Dagentx agentx/subagent: init_subagent sess 00325ea0 ag=
entx_register_app_config_handler: registering .conf token for "age=
ntxsocket"=20
 agentx_register_app_config_handler: registering .conf token for &qu=
ot;agentxperms" agentx_register_app_config_handler: registering .c=
onf token for "agentxRetries" agentx_register_app_config_=
handler: registering .conf token for=20
 "agentxTimeout" Turning on AgentX master support. age=
ntx/master: initializing... agentx/master: initializing...   =
DONE NET-SNMP version <a href=3D"http://5.2.1.2">5.2.1.2</a> "=
""=20

 Then I opened a cygwin window and compiled example-demon.c, here is =
the code: ############## # 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> #inc=
lude <signal.h> 
 #include <nstAgentSubagentObject.h> 
 static int keep_running; 
 RETSIGTYPE stop_server(int a) {     keep_runn=
ing =3D 0; 
 
} 
 int main (int argc, char **argv) {   int agentx_subagen=
t=3D1; /* change this if you want to be a SNMP master agent */ &nbs=
p; int background =3D 0; /* change this if you want to run in the backg=
round */=20
   int syslog =3D 0; /* change this if you want to use syslog */ </=
p>
  /* print log errors to syslog or stderr */   if (syslog)=
     snmp_enable_calllog();   else  &n=
bsp;  snmp_enable_stderrlog(); 
   /* we're an agentx subagent? */   if (agentx_subagen=
t) {     /* make us a agentx client. */   =
  netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGE=
NT_ROLE, 1);         netsnmp_ds_set_=
string(NETSNMP_DS_APPLICATION_ID,NETSNMP_DS_AGENT_ X_SOCKET,"=ADlocalho=
st:705");=20

   } 
   /* run in background, if requested */   if (backgrou=
nd && netsnmp_daemonize(1, !syslog))     &n=
bsp; exit(1);   /* initialize tcpip, if necessary */   SO=
CK_STARTUP; 
   /* initialize the agent library */   init_agent(&quo=
t;example-demon"); 
   /* initialize mib code here */ 
   /* mib code: init_nstAgentSubagentObject from nstAgentSub=
agentObject.C */   init_nstAgentSubagentObject(); 
   /* initialize vacm/usm access control  */   if =
(!agentx_subagent) {       init_vacm_vars(); <=
br>      init_usmUser();   } 
   /* example-demon will be used to read example-demon.conf file=
s. */   init_snmp("example-demon"); 
   /* If we're going to be a snmp master agent, initial the port=
s */   if (!agentx_subagent)     init_master_ag=
ent();  /* open the port to listen on (defaults to udp:161) */ </p=
>
   /* In case we recevie a request to stop (kill -TERM or kill -=
INT) */   keep_running =3D 1;   signal(SIGTERM, stop_serv=
er);   signal(SIGINT, stop_server); 
   snmp_log(LOG_INFO,"example-demon is up and running.\n&qu=
ot;); 
   /* your main loop here... */   while(keep_running) {=
     /* if you use select(), see snmp_select_info() in s=
nmp_api(3) */     /*     --- OR ---&=
nbsp; */     agent_check_and_process(1); /* 0 =3D=3D don=
't block */=20
   } 
   /* at shutdown time */   snmp_shutdown("example=
-demon");   SOCK_CLEANUP; 
   return 0; 
 
} 
 # end of example-demon.c ###################### 
Then I ran example-demon.exe, it says that "example-demon is up and=
 running"!!!!! 
 BUT, when I check the subagent's MIB it seems not working: c:\sn=
mpget -v 2c -c public localhost NET-SNMP-TUTORIAL-MIB::nstAgentSubagent=
Object.0 =3D=3D> NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 =3D=
No Such Object=20
 available on this agent at this OID 
 !!!!!!! 
 I spent some days trying to figure it out, I couldn't. Can you pleas=
e help me. 
 P.S 1. netstat -a shows me "TCP pc_name:705 pc_name:0 LISTE=
NING" 2. When I try to run the example-demon without running the m=
aster, I got the same behavior, it says that it's up and running!!, but=
in fact=20
 it's not. 3. I am running snmpd and example-demon from MS window (n=
ot form cygwin window), I don't know if that's matter. 
 Thanks in advance. -Ali 

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