#!/bin/sh
# the next line restarts using scotty -*- tcl -*- \
exec scotty2.1.11 "$0" "$@"
##
## snmp --
##
##	Simple SNMP Agent. This file only does the startup. All MIB
##	implementations are done in extra files that are sourced from
##	this file.
##
## Copyright (c) 1994-1996 Technical University of Braunschweig.
##
## See the file "license.terms" for information on usage and redistribution
## of this file, and for a DISCLAIMER OF ALL WARRANTIES.
##

package require Tnm 2.1

mib load rfc1213.mib

##
## Report all errors to standard error and write a message to
## the system logger.
##

proc bgerror { msg } {
    global errorInfo
    syslog error $msg
    puts stderr $errorInfo
}

##
## Create an agent session for SNMPv1, SNMPv2C or SNMPv2U. 
##

proc CreateAgent { version port {interp {}} } {
    global tnm
    set ip [netdb hosts address $tnm(host)]
    set s [snmp session -port $port -address $ip]
    if {[catch {$s configure -version $version} msg]} {
	$s destroy
	error $msg
    }
    if {$version == "SNMPv2U"} {
	$s configure -user $tnm(user)
    }
    $s configure -agent $interp
    return $s
}

##
## Create a Tcl interpreter that can be used to evaluate arbitrary
## scripts send from potentially unsecure managers. You can run the
## agent with an unsafe Tcl interpreter by uncommenting the return
## command below. But it will be your own risk to do so. You have
## been warned.
##

proc CreateSafeInterp {} {

    # return ""

    set interp [interp create -safe]

    # List of commands allowed in the safe Tcl interpreter. Note, the
    # http command allows to write to local files. This is no problem
    # if you run the agent on a restricted account.

    # Safe Tcl/Tk commands.
    
    $interp alias bgerror	bgerror
    $interp alias puts		puts stderr
    
    # Safe Scotty commands.
    
    $interp alias icmp		icmp
    $interp alias http		http
    $interp alias syslog	syslog
    $interp alias mib		mib
    return $interp
}

##
## Startup the agent on port 1701.
##

if [catch {CreateAgent SNMPv2C 1701 [CreateSafeInterp]} s] {
    puts stderr "Failed to setup SNMP agent: $s"
    exit 42
}

##
## Load and initialize some MIB modules.
##

set agentDir [file join $tnm(library) agents]
if {[file exists $agentDir/snmpd-tnm.tcl]} {
    source $agentDir/snmpd-tnm.tcl
    SNMP_TnmInit $s
    SNMP_HttpInit $s
    SMMP_EvalInit $s
}

if {[file exists $agentDir/snmpd-nfs.tcl]} {
    source $agentDir/snmpd-nfs.tcl
    SNMP_NfsInit $s
}

if {[file exists $agentDir/snmpd-proc.tcl]} {
    source $agentDir/snmpd-proc.tcl
    SNMP_ProcInit $s
}

if {[file exists $agentDir/snmpd-mlm.tcl]} {
    source $agentDir/snmpd-mlm.tcl
    SNMP_MLMInit $s
}

if {[file exists $agentDir/snmpd-http.tcl]} {
    source $agentDir/snmpd-http.tcl
    SNMP_HTTPInit $s
}

##
## Some bindings to see what the agent is doing.
##

# $s bind 1.3 get      { puts "get      -> %V" }
# $s bind 1.3 set      { puts "set      -> %V" }
# $s bind 1.3 create   { puts "create   -> %V" }
# $s bind 1.3 check    { puts "check    -> %V" }
# $s bind 1.3 commit   { puts "commit   -> %V" }
# $s bind 1.3 rollback { puts "rollback -> %V" }
# $s bind ""  begin    { puts "begin    -> %T %E %I %V" }
# $s bind ""  end      { puts "end      -> %T %E %I %V" }

##
## Show our configuration so that other can talk to us.
##

puts stdout "SNMP agent started using the following parameters:"
foreach {option value} [$s configure] {
    if {$value != ""} {
	puts [format "  %-10s = %s" $option $value]
    }
}
