Hi to all net-snmp coders,
I am developing some MIB handlers using pass_persist perl script. I try
the example(local/pass_persist) you provide in your packege(version
5.1), and encounted some problems. The example is as following:
#!/usr/bin/perl
# Persistant perl script to respond to pass-through smnp requests
# put the following in your snmpd.conf file to call this script:
#
# pass_persist .1.3.6.1.4.1.2021.255 /path/to/pass_persisttest
# Forces a buffer flush after every echo
$|=1;
use strict;
my $counter = 0;
my $place = ".1.3.6.1.4.1.2021.255";
while (<>){
if (m!^PING!){
print "PONG\n";
next;
}
my $cmd = $_;
my $req = <>;
my $ret;
chomp($cmd);
chomp($req);
if ( $cmd eq "set" ) { # i add
print "wrong-type\n"; # these lines
next; # to try
} # how to handle set command
if ( $cmd eq "getnext" ) {
if ($req eq $place) {
$ret = "$place.1";
} elsif ($req eq "$place.1") {
$ret = "$place.2.1";
} elsif ($req eq "$place.2.1") {
$ret = "$place.2.2";
} elsif ($req eq "$place.2.2") {
$ret = "$place.3";
} elsif ($req eq "$place.3") {
$ret = "$place.4";
} elsif ($req eq "$place.4") {
$ret = "$place.5";
} elsif ($req eq "$place.5") {
$ret = "$place.6";
} else {
print "NONE\n";
next;
}
} else {
if ($req eq $place) {
print "NONE\n";
next;
} else {
$ret = $req;
}
}
print "$ret\n";
if ($ret eq "$place.1") {
print "string\nlife the universe and everything\n";
} elsif ($ret eq "$place.2.1") {
print "integer\n423\n";
} elsif ($ret eq "$place.2.2") {
print "objectid\n.1.3.6.1.4.42.42.42\n";
} elsif ($ret eq "$place.3") {
print "timeticks\n363136200\n";
} elsif ($ret eq "$place.4") {
print "ipaddress\n127.0.0.1\n";
} elsif ($ret eq "$place.5") {
$counter++;
print "counter\n$counter\n";
} elsif ($ret eq "$place.6") {
print "gauge\n42\n";
} else {
print "string\nack... $ret $req\n";
}
}
When i run the command as following:
[EMAIL PROTECTED] snmp]# snmpset -v 2c -c private localhost
1.3.6.1.4.1.2021.255.1.1 i 5
I expect to get output something like:
Error in packet.
Reason: wrongType (The set datatype does not match the data type the agent
expects)
But in fact, the output is:
UCD-SNMP-MIB::ucdavis.255.1.1 = INTEGER: 5
In addition, when i run the command a second time, the process running the
pass_persist script will exit. It seems that such a script aren't
"persist"
as it was called:)
So, my questions are:
1)how to write script to handle snmp set command;
2)how to let such scripts to return correct error message.
PS:
If we resive the script as following:
#!/usr/bin/perl
# Persistant perl script to respond to pass-through smnp requests
# put the following in your snmpd.conf file to call this script:
#
# pass_persist .1.3.6.1.4.1.2021.255 /path/to/pass_persisttest
# Forces a buffer flush after every echo
$|=1;
use strict;
my $counter = 0;
my $place = ".1.3.6.1.4.1.2021.255";
while (<>){
if (m!^PING!){
print "PONG\n";
next;
}
my $cmd = $_;
my $req = <>;
my $ret;
chomp($cmd);
chomp($req);
if ( $cmd eq "set" ) { # i add
print "wrong-type"; # these lines
print "PONG\n"; #####################note this line
next; # to try
} # how to handle set command
if ( $cmd eq "getnext" ) {
if ($req eq $place) {
$ret = "$place.1";
} elsif ($req eq "$place.1") {
$ret = "$place.2.1";
} elsif ($req eq "$place.2.1") {
$ret = "$place.2.2";
} elsif ($req eq "$place.2.2") {
$ret = "$place.3";
} elsif ($req eq "$place.3") {
$ret = "$place.4";
} elsif ($req eq "$place.4") {
$ret = "$place.5";
} elsif ($req eq "$place.5") {
$ret = "$place.6";
} else {
print "NONE\n";
next;
}
} else {
if ($req eq $place) {
print "NONE\n";
next;
} else {
$ret = $req;
}
}
print "$ret\n";
if ($ret eq "$place.1") {
print "string\nlife the universe and everything\n";
} elsif ($ret eq "$place.2.1") {
print "integer\n423\n";
} elsif ($ret eq "$place.2.2") {
print "objectid\n.1.3.6.1.4.42.42.42\n";
} elsif ($ret eq "$place.3") {
print "timeticks\n363136200\n";
} elsif ($ret eq "$place.4") {
print "ipaddress\n127.0.0.1\n";
} elsif ($ret eq "$place.5") {
$counter++;
print "counter\n$counter\n";
} elsif ($ret eq "$place.6") {
print "gauge\n42\n";
} else {
print "string\nack... $ret $req\n";
}
}
we can run snmpset command mentioned before for any times. The process
running the pass_persist script will NOT exit now! But we still cannot get
the the correct error reports.
Thanks.
Best regards,
Su Zhiyong
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