I am running Net-Snmp (environment is a virtual machine running Linux Mint OS 11) and have configured it to send trap information to a text file that I have called trapd.txt.
If I reboot the VM, any trap that is generated is sent to the file no problem. However If I run a C++ program using ifstream to open it and then close it no trap information can be written to it again until I reboot.
When I generate a trap during this state I will sometimes even see the trapd.txt file flicker in the GUI as if it tried to write but failed. This situation happens if I do a clean reboot and run the following code and it alone:
ifstream file;
file.open("trapd.txt");
if(file)
cout<<"open"<<endl;
file.close();
file.open("nothing.txt");
file.close();
exit(0);
Clearly this code is not changing permissions or the SNMP configuration files. The only reason I can think that would prevent trap information from coming in afterwards is that the ifstream is not actually getting closed all the way.
If you have any ideas for a fix or a work around or any insight whatsoever I will be extremely grateful! This is a fairly important to me…
Here’s my snmp.conf file:
oidOutputFormat 1 oidOutputFormat 5 logTimestamp yes escapeQuotes yes
snmptrapd.conf:
authCommunity log,execute,net public authCommunity log,execute,net private outputOption auSs logOption f /home/utd/Desktop/REPO/src/Manager/trapd.txt
snmpd.conf:
authtrapenable 1
master all
linkUpDownNotifications yes
defaultMonitors yes
trap2sink localhost public
rwcommunity private localhost
rocommunity public localhost
###############################################################################
#
# EXAMPLE.conf:
# An example configuration file for configuring the Net-SNMP agent ('snmpd')
# See the 'snmpd.conf(5)' man page for details
#
# Some entries are deliberately commented out, and will need to be explicitly activated
#
###############################################################################
#
# AGENT BEHAVIOUR
#
# Listen for connections from the local system only
agentAddress udp:127.0.0.1:161
# Listen for connections on all interfaces (both IPv4 *and* IPv6)
#agentAddress udp:161,udp6:[::1]:161
###############################################################################
#
# SNMPv3 AUTHENTICATION
#
# Note that these particular settings don't actually belong here.
# They should be copied to the file /var/lib/snmp/snmpd.conf
# and the passwords changed, before being uncommented in that file *only*.
# Then restart the agent
# createUser authOnlyUser MD5 "remember to change this password"
# createUser authPrivUser SHA "remember to change this one too" DES
# createUser internalUser MD5 "this is only ever used internally, but still change the password"
# If you also change the usernames (which might be sensible),
# then remember to update the other occurances in this example config file to match.
###############################################################################
#
# ACCESS CONTROL
#
# system + hrSystem groups only
view systemonly included .1.3.6.1.2.1.1
view systemonly included .1.3.6.1.2.1.25.1
# Full access from the local host
# Default access to basic system info
# Full access from an example network
# Adjust this network address to match your local
# settings, change the community string,
# and check the 'agentAddress' setting above
# Full read-only access for SNMPv3
rouser authOnlyUser
# Full write access for encrypted requests
# Remember to activate the 'createUser' lines above
#rwuser authPrivUser priv
# It's no longer typically necessary to use the full 'com2sec/group/access' configuration
# r[ou]user and r[ow]community, together with suitable views, should cover most requirements
###############################################################################
#
# SYSTEM INFORMATION
#
# Note that setting these values here, results in the corresponding MIB objects being 'read-only'
# See snmpd.conf(5) for more details
sysContact Me <me@example.org>
# Application + End-to-End layers
sysServices 72
#
# Process Monitoring
#
# At least one 'mountd' process
proc mountd
# No more than 4 'ntalkd' processes - 0 is OK
proc ntalkd 4
# At least one 'sendmail' process, but no more than 10
proc sendmail 10 1
# Walk the UCD-SNMP-MIB::prTable to see the resulting output
# Note that this table will be empty if there are no "proc" entries in the snmpd.conf file
#
# Disk Monitoring
#
# 10 MB required on root disk, 5% free on /var, 10% free on all other disks
disk / 10000
disk /var 5%
includeAllDisks 10%
# Walk the UCD-SNMP-MIB::dskTable to see the resulting output
# Note that this table will be empty if there are no "disk" entries in the snmpd.conf file
#
# System Load
#
# Unacceptable 1-, 5-, and 15-minute load averages
load 12 10 5
# Walk the UCD-SNMP-MIB::laTable to see the resulting output
# Note that this table *will* be populated, even without a "load" entry in the snmpd.conf file
###############################################################################
#
# ACTIVE MONITORING
#
# Send SNMPv1 traps
# Send SNMPv2c traps
# Send SNMPv2c INFORMs
# Note that you typically only want *one* of these three lines
# Uncommenting two (or all three) will result in multiple copies of each notification.
#
# Event MIB - automatically generate alerts
#
# Remember to activate the 'createUser' lines above
iquerySecName internalUser
rouser internalUser
# Generate traps on UCD error conditions
# Generate traps on linkUp/Down
###############################################################################
#
# EXTENDING THE AGENT
#
#
# Arbitrary extension commands
#
extend test1 /bin/echo Hello, world!
extend-sh test2 echo Hello, world! ; echo Hi there ; exit 35
#perl $debugging = '1';
#perl $verbose = '1';
#perl {$regat = '.1.3.6.1.4.1.8072.999'; $extenstion = '1'; $mibdata = '/etc/passwd'; $delimT=''; $delimV=':'; do '/etc/snmp/snmpagent.pl';}
#perl print STDERR 'Test'
#perl $debugging = '1';
#perl $verbose = '1';
#perl $regat = '.1.3.6.1.4.8072.999';
#perl $extenstion = '1';
#perl $mibdata = '/etc/passwd';
#perl $delimT='';
#perl $delimV=':';
#perl do '/home/utd/snmpagent.pl';
#perl print STDERR 'Now loading Perl extensions...n'
#perl $mibdata = "dick.txt";
#perl do '/home/utd/mymod.pl';
#extend-sh test3 /bin/sh /tmp/shtest
# Note that this last entry requires the script '/tmp/shtest' to be created first,
# containing the same three shell commands, before the line is uncommented
# Walk the NET-SNMP-EXTEND-MIB tables (nsExtendConfigTable, nsExtendOutput1Table
# and nsExtendOutput2Table) to see the resulting output
# Note that the "extend" directive supercedes the previous "exec" and "sh" directives
# However, walking the UCD-SNMP-MIB::extTable should still returns the same output,
# as well as the fuller results in the above tables.
#
# "Pass-through" MIB extension command
#
#pass .1.3.6.1.4.1.8072.2.255 /bin/sh PREFIX/local/passtest
#pass .1.3.6.1.4.1.8072.2.255 /usr/bin/perl PREFIX/local/passtest.pl
# Note that this requires one of the two 'passtest' scripts to be installed first,
# before the appropriate line is uncommented.
# These scripts can be found in the 'local' directory of the source distribution,
# and are not installed automatically.
# Walk the NET-SNMP-PASS-MIB::netSnmpPassExamples subtree to see the resulting output
#
# AgentX Sub-agents
#
# Run as an AgentX master agent
master agentx
# Listen for network connections (from localhost)
# rather than the default named socket /var/agentx/master
#agentXSocket tcp:localhost:705
perl $mibdata = "/etc/snmp/agenty.conf";
perl do "/etc/snmp/agenty.pl";
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Answer
The problem’s origin was actually from the editing and saving of the file itself by myself using gedit. While I still do not understand why this would cause the issue I can work around it by not editing the file. Thanks to everyone who replied.