/usr/bin/nnslog is in tcllib 1.19-dfsg-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | #! /usr/bin/env tclsh
# -*- tcl -*-
# @@ Meta Begin
# Application nnslog 1.1
# Meta platform tcl
# Meta summary Nano Name Service Logger
# Meta description This application connects to a name service demon
# Meta description and then continuously logs all changes (new/removed
# Meta description definitions) to the standard output. It will survive
# Meta description the loss of the nameserver and automatically reconnect
# Meta description and continue when it comes back.
# Meta subject {name service} client log
# Meta require {Tcl 8.4}
# Meta require logger
# Meta require nameserv::auto
# Meta author Andreas Kupries
# Meta license BSD
# @@ Meta End
package provide nnslog 1.0
# nns - Nano Name Service Logger
# === = ========================
#
# Use cases
# ---------
#
# (1) Continuously monitor a nameservice for changes.
#
# Command syntax
# --------------
#
# (Ad 1) nnslog ?-host NAME|IP? ?-port PORT? ?-color BOOL?
#
# Monitor a name server. If no port is specified the default
# port 38573 is used to connect to it. If no host is specified
# the default (localhost) is used to connect to it.
# ### ### ### ######### ######### #########
## Requirements
lappend auto_path [file join [file dirname [file dirname \
[file normalize [info script]]]] modules]
package require nameserv::auto 0.3 ;# Need auto-restoring search.
logger::initNamespace ::nnslog
namespace eval ::nnslog { log::setlevel info }
# ### ### ### ######### ######### #########
## Process application command line
proc ::nnslog::ProcessCommandLine {} {
global argv
# Process the options, perform basic validation.
set xcolor 0
if {[llength $argv] < 1} return
while {[llength $argv]} {
set opt [lindex $argv 0]
if {![string match "-*" $opt]} break
switch -exact -- $opt {
-host {
if {[llength $argv] < 2} Usage
set host [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::configure -host $host
}
-port {
if {[llength $argv] < 2} Usage
# Todo: Check non-zero unsigned short integer
set port [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::configure -port $port
}
-debug {
# Undocumented. Activate the logger services provided
# by various packages.
logger::setlevel debug
set argv [lrange $argv 1 end]
}
default Usage
}
}
# Additional validation. no arguments should be left over.
if {[llength $argv] > 1} Usage
return
}
proc ::nnslog::Usage {{sfx {}}} {
global argv0 ; append argv0 $sfx
puts stderr "$argv0 wrong#args, expected: ?-host NAME|IP? ?-port PORT?"
exit 1
}
proc ::nnslog::ArgError {text} {
global argv0
puts stderr "$argv0: $text"
#puts $::errorInfo
exit 1
}
# ### ### ### ######### ######### #########
## Setup a text|graphical report
proc ::nnslog::My {} {
# Quick access to format the identity of the name service the
# client talks to.
return "[nameserv::auto::cget -host] @[nameserv::auto::cget -port]"
}
proc ::nnslog::Connection {message args} {
# args = tag event details, ignored
log::info $message
return
}
proc ::nnslog::MonitorConnection {} {
uevent::bind nameserv lost-connection [list ::nnslog::Connection "Disconnected name service at [My]"]
uevent::bind nameserv re-connection [list ::nnslog::Connection "Reconnected2 name service at [My]"]
return
}
# ### ### ### ######### ######### #########
## Main
proc ::nnslog::Do.search {} {
MonitorConnection
set contents [nameserv::auto::search -continuous *]
$contents configure -command [list ::nnslog::Do.search.change $contents]
log::info "Logging name service at [My]"
vwait ::forever
# Not reached.
return
}
namespace eval ::nnslog {
variable map
array set map {
add +++
remove ---
}
}
proc ::nnslog::Do.search.change {res type response} {
variable map
if {$type eq "stop"} {
# Cannot happen for nameserv::auto client, we are free to panic.
$res destroy
log::critical {Bad event 'stop' <=> Lost connection, search closed}
return
}
# Print events ...
foreach {name value} $response {
log::info "$map($type) : [list $name = $value]"
}
return
}
# ### ### ### ######### ######### #########
## Invoking the functionality.
::nnslog::ProcessCommandLine
if {[catch {
::nnslog::Do.search
} msg]} {
::nnslog::ArgError $msg
}
# ### ### ### ######### ######### #########
exit
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