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# Access control procedures for PCProxy
#
# $Id: access.tcl,v 1.5 2004/03/11 09:30:03 kees Exp $
#
########################################################################
# Copyright (C) 2001-2003 Kees Leune
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
proc initACL {} {
global ACL SETTINGS
if {[info exists SETTINGS(access)] &&
![string match $SETTINGS(access) ""]} {
set count 0
cprint "Loading access control list from $SETTINGS(access)"
if {[catch {
set f [open $SETTINGS(access) r]
}]} {
cprint "Unable to load access control list."
return
}
while {![eof $f]} {
if {[catch {
gets $f line
}]} {
break
}
if {$line == ""} { continue }
if {[regexp {^[;#]} $line x]} { continue }
if {[regexp {^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+} $line x]} {
incr count
lappend ACL $line
} else {
cprint "Ignoring ACL entry $line (invalid format)"
}
}
cprint "Allowing $count hosts to connect"
close $f
return
}
}
proc checkACL {ip ch} {
global ACL SETTINGS
if {![info exists SETTINGS(access)]} {
return 0
}
if {[info exists ACL] && \
[lsearch -exact $ACL $ip] != -1} {
# if there is no ACL, or if there is one and we are on it, allow
# access.
return 0
}
catch {
uprint $ch "You are not allowed to connect to this port. Goodbye."
flush $ch
disconnect $ch
}
debug "Refusing $ip"
return 1
}
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