Feb 18 18:42:58 localhost snmptrapd[6479]: 2025-02-18 18:42:48 <UNKNOWN> [UDP: [192.168.40.191]:55353->[192.168.40.181]:162]:#012sysUpTimeInstance = Timeticks: (2594473) 7:12:24.73#011snmpTrapOID.0 = OID: snmpMIB#011linkDown = STRING: "eth0" Feb 18 18:42:58 localhost snmptrapd[6479]: Loaded Zabbix SNMP trap receiver Feb 18 18:42:58 localhost snmptrapd[6481]: Scalar value @args[0] better written as $args[0] at /usr/lib64/perl5/vendor_perl/Sys/Syslog.pm line 454. Feb 18 18:42:58 localhost snmptrapd[6481]: Redundant argument in sprintf at /usr/lib64/perl5/vendor_perl/Sys/Syslog.pm line 454. Feb 18 18:42:58 localhost snmptt-sys[6481]: SNMPTT v1.4 started Feb 18 18:42:58 localhost snmptt-sys[6481]: Loading /etc/snmp/snmptt.conf Feb 18 18:42:58 localhost snmptrapd[6481]: Redundant argument in sprintf at /usr/lib64/perl5/vendor_perl/Sys/Syslog.pm line 454. Feb 18 18:42:58 localhost snmptrapd[6481]: Redundant argument in sprintf at /usr/lib64/perl5/vendor_perl/Sys/Syslog.pm line 454, <SNMPTTCONF> line 6. Feb 18 18:42:58 localhost snmptt-sys[6481]: Finished loading 6 lines from /etc/snmp/snmptt.conf Feb 18 18:42:58 localhost snmptrapd[6481]: Redundant argument in sprintf at /usr/lib64/perl5/vendor_perl/Sys/Syslog.pm line 454. Feb 18 18:42:58 localhost snmptrapd[6481]: Debug file /var/log/snmptt/snmptt.debug.log re-opened under uid 995 Feb 18 18:42:58 localhost snmptt-sys[6481]: Changing to UID: snmptt (995)
This is the command I am using to generate the traps from agent.snmptrap -v 2c -c public 192.168.40.181 '' SNMPv2-MIB::snmpMIB IF-MIB::linkDown s eth0 {}
 
[root@localhost Sys]# cat /etc/snmp/snmptrapd.conf # Example configuration file for snmptrapd # # No traps are handled by default, you must edit this file! # # authCommunity log,execute,net public # traphandle SNMPv2-MIB::coldStart /usr/bin/bin/my_great_script cold disableAuthorization yes outputOption s #traphandle default /usr/bin/zabbix_trap_receiver.pl authCommunity execute public #traphandle default /usr/lib/zabbix/externalscripts/snmptrap.sh perl do "/usr/bin/zabbix_trap_receiver.pl"; #traphandle default /usr/local/snmptt/snmptt v #traphandle default /usr/local/bin/snmptrap_handler.sh [root@localhost Sys]# [root@localhost Sys]# cat /usr/bin/zabbix_trap_receiver.pl #Unable to render embedded object: File ( # [http://net-snmp.sourceforge.net/wiki/index.php/Tut:Extending_snmpd_using_perl] ################################################# #### ZABBIX SNMP TRAP RECEIVER CONFIGURATION #### ################################################# ### Option: SNMPTrapperFile # Temporary file used for passing data to the server (or proxy). Must be the same # as in the server (or proxy) configuration file. # # Mandatory: yes # Default: $SNMPTrapperFile = '/tmp/zabbix_traps.tmp'; ### Option: DateTimeFormat # The date time format in strftime() format. Please make sure to have a corresponding # log time format for the SNMP trap items. # # Mandatory: yes # Default: $DateTimeFormat = '%H:%M:%S %Y/%m/%d'; ################################### #### ZABBIX SNMP TRAP RECEIVER #### ################################### use NetSNMP::TrapReceiver; use Fcntl qw(O_WRONLY O_APPEND O_CREAT); use POSIX qw(strftime); sub zabbix_receiver { my (%pdu_info) = %{$_[0]}; my (@varbinds) = @{$_[1]}; # open the output file unless (sysopen(OUTPUT_FILE, $SNMPTrapperFile, O_WRONLY) not found.\n"; return NETSNMPTRAPD_HANDLER_FAIL; } # get the host name my $hostname = $pdu_info{'receivedfrom'} || 'unknown'; if ($hostname ne 'unknown') { $hostname =~ /[(.?)]./; # format: "UDP: [127.0.0.1]:41070>[127.0.0.1]" $hostname = $1 || 'unknown'; } # print trap header # timestamp must be placed at the beginning of the first line (can be omitted) # the first line must include the header "ZBXTRAP [IP/DNS address] " # * IP/DNS address is the used to find the corresponding SNMP trap items # * this header will be cut during processing (will not appear in the item value) printf OUTPUT_FILE "%s ZBXTRAP %s\n", strftime($DateTimeFormat, localtime), $hostname; # print the PDU info print OUTPUT_FILE "PDU INFO:\n"; foreach my $key(keys(%pdu_info)) { if ($pdu_info{$key} !~ /^[[:print:]]$/) { my $OctetAsHex = unpack('H', $pdu_info{$key}); # convert octet string to hex $pdu_info{$key} = "0x$OctetAsHex"; # apply 0x prefix for consistency } printf OUTPUT_FILE " %30s %s\n", $key, $pdu_info{$key}; } # print the variable bindings: print OUTPUT_FILE "VARBINDS:\n"; foreach my $x (@varbinds) { printf OUTPUT_FILE " %-30s type=%-2d value=%s\n", $x>[0], $x->[2], $x->[1]; } close (OUTPUT_FILE); # Call SNMPTT to process the trap system("/usr/local/snmptt/snmptt"); return NETSNMPTRAPD_HANDLER_OK; } NetSNMP::TrapReceiver::register("all", \&zabbix_receiver) or die "failed to register Zabbix SNMP trap receiver\n"; print STDOUT "Loaded Zabbix SNMP trap receiver\n"; [root@localhost Sys]#