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#! /usr/bin/env tclsh
# -*- tcl -*-
# @@ Meta Begin
# Application nnsd 1.0.1
# Meta platform tcl
# Meta summary Nano Name Service Demon
# Meta description This application is a simple demon on top
# Meta description of the nano name service facilities
# Meta subject {name service} server demon
# Meta require {Tcl 8.4}
# Meta require comm
# Meta require logger
# Meta require interp
# Meta require nameserv::common
# Meta require nameserv::server
# Meta author Andreas Kupries
# Meta license BSD
# @@ Meta End
package provide nnsd 1.0.1
# nnsd - Nano Name Service Demon
# ==== = =======================
#
# Use cases
# ---------
#
# (1) Run a simple trusted name service on some host.
#
# Command syntax
# --------------
#
# Ad 1) nnsd ?-localonly BOOL? ?-port PORT?
#
# Run the server. If no port is specified the default port 38573
# is used to listen for client. The option -localonly determines
# what connections are acceptable, local only (default), or
# remote connections as well. Local connections are whose
# originating from the same host which is running the server.
# Remote connections come from other hosts.
lappend auto_path [file join [file dirname [file dirname [file normalize [info script]]]] modules]
package require nameserv::server
namespace eval ::nnsd {}
proc ::nnsd::ProcessCommandLine {} {
global argv
# Process the options, perform basic validation.
while {[llength $argv]} {
set opt [lindex $argv 0]
if {![string match "-*" $opt]} break
switch -exact -- $opt {
-localonly {
if {[llength $argv] % 2 == 1} Usage
# Todo: Check boolean
set local [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::server::configure -localonly $local
}
-port {
if {[llength $argv] % 2 == 1} Usage
# Todo: Check non-zero unsigned short integer
set port [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::server::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, and extraction of the non-option
# arguments. Of which this application has none.
if {[llength $argv]} Usage
return
}
proc ::nnsd::Usage {} {
global argv0
puts stderr "$argv0 wrong#args, expected:\
?-localonly BOOL? ?-port PORT?"
exit 1
}
proc ::nnsd::ArgError {text} {
global argv0
puts stderr "$argv0: $text"
exit 1
}
proc bgerror {args} {
puts stderr $args
puts stderr $::errorInfo
return
}
# ### ### ### ######### ######### #########
## Main
proc ::nnsd::Headline {} {
global argv0
set p [nameserv::server::cget -port]
set l [expr {[nameserv::server::cget -localonly]
? "local only"
: "local & remote"}]
puts "$argv0 [package require nnsd], listening on $p ($l)"
return
}
proc ::nnsd::Do {} {
global argv0
ProcessCommandLine
nameserv::server::start
Headline
vwait forever
return
}
# ### ### ### ######### ######### #########
## Invoking the functionality.
if {[catch {
::nnsd::Do
} msg]} {
puts $::errorInfo
#::nnsd::ArgError $msg
}
# ### ### ### ######### ######### #########
exit
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