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# Network.tcl ---
#
# This file is part of The Coccinella application.
# It implements some network utilities.
#
# Copyright (c) 2003 Mats Bengtsson
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# See the README file for license, bugs etc.
#
# $Id: Network.tcl,v 1.21 2007-07-19 06:28:18 matben Exp $
package provide Network 1.0
namespace eval ::Network:: {
variable debug 0
}
# Network::Open --
#
# This is supposed to be a fairly general method of opening sockets
# async.
#
# Arguments:
# nameOrIP
# port
# cmd Specific callback proc for this open operation.
# 'cmd {sock ip port status {msg {}}}'
# args -timeout secs,
# -ssl boolean
# Must not be mixed up with -tls which has a special
# meaning in XMPP
#
# Results:
# only via the callback cmd.
proc ::Network::Open {nameOrIP port cmd args} {
global errorCode
variable debug
variable opts
if {$debug > 1} {
puts "::Network::Open, nameOrIP=$nameOrIP, port=$port, cmd=$cmd, args=$args"
}
array set opts {
-timeout 0
-ssl 0
}
array set opts $args
if {$opts(-ssl)} {
set socketCmd {::tls::socket -request 0 -require 0}
} else {
set socketCmd socket
}
# Try opening socket async.
if {[catch {eval $socketCmd {-async $nameOrIP $port}} sock]} {
uplevel #0 $cmd [list {} $nameOrIP $port error $sock]
return
}
# Write/read line by line.
fconfigure $sock -buffering line
# When socket writable the connection is opened.
# Needs to be in nonblocking mode.
fconfigure $sock -blocking 0
# For nonlatin characters to work be sure to use Unicode/UTF-8.
if {[info tclversion] >= 8.1} {
catch {fconfigure $sock -encoding utf-8}
}
# If open socket in async mode, need to wait for fileevent.
fileevent $sock writable \
[list [namespace current]::WhenSocketOpensInits $sock $nameOrIP \
$port $cmd $opts(-ssl)]
# Set up timer event for timeouts.
if {$opts(-timeout) > 0} {
::Network::ScheduleKiller $sock $cmd
}
return
}
# Network::WhenSocketOpensInits --
#
# Callback when socket is open; becomes writable.
#
# Arguments:
# sock
# nameOrIP
# port
# cmd Specific callback proc for this open operation.
# Results:
# only via the callback cmd.
proc ::Network::WhenSocketOpensInits {sock nameOrIP port cmd tls} {
variable killerId
variable debug
if {$debug > 1} {
puts "::Network::WhenSocketOpensInits, nameOrIP=$nameOrIP, port=$port"
}
# No more event handlers here. See also below...
fileevent $sock writable {}
# Cancel timeout killer.
if {[info exists killerId($sock)]} {
after cancel $killerId($sock)
unset -nocomplain killerId($sock)
}
if {[catch {eof $sock} iseof] || $iseof} {
catch {close $sock}
set msg "Failed to open network socket to $nameOrIP."
uplevel #0 $cmd [list $sock $nameOrIP $port error $msg]
return
}
# Detecting failure to connect, at least needed on linux.
# The jabber server gives: <stream:error>Invalid XML</stream:error>
if {0 && [catch {puts -nonewline $sock { }} msg]} {
set msg "Failed to open network socket to $nameOrIP."
uplevel #0 $cmd [list $sock $nameOrIP $port error $msg]
return
}
# Check if something went wrong first.
if {[catch {fconfigure $sock -sockname} sockname]} {
uplevel #0 $cmd [list $sock $nameOrIP $port error $sockname]
return
}
# Do SSL handshake.
if {$tls} {
fconfigure $sock -blocking 1
if {[catch {::tls::handshake $sock} msg]} {
catch {close $sock}
uplevel #0 $cmd [list $sock $nameOrIP $port error $msg]
return
}
fconfigure $sock -blocking 0
}
# Evaluate our callback procedure.
uplevel #0 $cmd [list $sock $nameOrIP $port ok]
}
# ScheduleKiller, Kill --
#
# Cancel 'OpenConnection' process if timeout.
#
# Arguments:
# sock
# cmd Specific callback proc for this open operation if we get
# a timeout.
#
# Results:
proc ::Network::ScheduleKiller {sock cmd} {
variable killerId
variable opts
if {[info exists killerId($sock)]} {
after cancel $killerId($sock)
}
set killerId($sock) [after [expr {1000 * $opts(-timeout)}] \
[list [namespace current]::Kill $sock $cmd]]
}
proc ::Network::Kill {sock cmd} {
variable killerId
catch {close $sock}
if {[info exists killerId($sock)]} {
after cancel $killerId($sock)
unset -nocomplain killerId($sock)
}
# Evaluate our callback procedure.
uplevel #0 $cmd [list $sock {} {} timeout]
}
# Network::KillAll --
#
# Kills all pending open states.
proc ::Network::KillAll { } {
variable killerId
foreach sock [array names killerId] {
catch {close $sock}
after cancel $killerId($sock)
}
unset -nocomplain killerId
}
# Network::GetThisPublicIP --
#
# Returns our own ip number unless set own NAT address.
proc ::Network::GetThisPublicIP { } {
global this prefs
if {$prefs(setNATip) && ($prefs(NATip) ne "")} {
return $prefs(NATip)
} else {
return $this(ipnum)
}
}
#-------------------------------------------------------------------------------
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