2 # The User/Sysop Filter module
4 # The way this works is that the filter routine is actually
5 # a predefined function that returns 0 if it is OK and 1 if it
6 # is not when presented with a list of things.
8 # This set of routines provide a means of maintaining the filter
9 # scripts which are compiled in when an entity connects.
11 # Copyright (c) 1999 Dirk Koopman G1TLH
17 # The filters live in a directory tree of their own in $main::root/filter
19 # Each type of filter (e.g. spot, wwv) live in a tree of their own so you
20 # can have different filters for different things for the same callsign.
22 # Each filter file has the same structure:-
26 # [ action, fieldno, fieldsort, comparison, action data ],
30 # The action is usually 1 or 0 but could be any numeric value
32 # The fieldno is the field no in the list of fields that is presented
35 # The fieldsort is the type of field that we are dealing with which
36 # currently can be 'a', 'n', 'r' or 'd'. 'a' is alphanumeric, 'n' is
37 # numeric, 'r' is ranges of pairs of numeric values and 'd' is default.
39 # Filter::it basically goes thru the list of comparisons from top to
40 # bottom and when one matches it will return the action and the action data as a list.
42 # are the element nos of the list that is presented to Filter::it. Element
43 # 0 is the first field of the list.
55 use vars qw ($filterbasefn $in);
57 $filterbasefn = "$main::root/filter";
60 # initial filter system
67 # takes the reference to the filter (the first argument) and applies
68 # it to the subsequent arguments and returns the action specified.
73 my ($action, $field, $fieldsort, $comp, $actiondata);
79 return ($action, $actiondata) if !$filter;
81 for $ref (@{$filter}) {
82 ($action, $field, $fieldsort, $comp, $actiondata) = @{$ref};
83 if ($fieldsort eq 'n') {
85 return ($action, $actiondata) if grep $_ == $val, @{$comp};
86 } elsif ($fieldsort eq 'r') {
90 for ($i = 0; $i < @range; $i += 2) {
91 return ($action, $actiondata) if $val >= $range[$i] && $val <= $range[$i+1];
93 } elsif ($fieldsort eq 'a') {
94 return ($action, $actiondata) if $_[$field] =~ m{$comp};
96 return ($action, $actiondata); # the default action
101 # this reads in a filter statement and returns it as a list
103 # The filter is stored in straight perl so that it can be parsed and read
104 # in with a 'do' statement. The 'do' statement reads the filter into
105 # @in which is a list of references
109 my ($sort, $call) = @_;
110 my $fn = "$filterbasefn/$sort/$call.pl";
114 dbg('conn', "$@") if $@;
120 # this writes out the filter in a form suitable to be read in by 'read_in'
121 # It expects a list of references to filter lines
126 my $fn = "$filterbasefn/$sort";
129 # make the output directory
130 mkdir $fn, 0777 unless -e $fn;
133 $fn = "$fn/$call.pl";
134 unless (open FILTER, ">$fn") {
135 warn "can't open $fn $!" ;
139 my $today = localtime;
140 print FILTER "#!/usr/bin/perl
142 # Filter for $call stored $today
149 my ($action, $field, $fieldsort, $comp, $actiondata) = @{$ref};
150 print FILTER "\t[ $action, $field, $fieldsort,";
151 if ($fieldsort eq 'n' || $fieldsort eq 'r') {
152 print FILTER "[ ", join (',', $comp), " ],";
153 } elsif ($fieldsort eq 'a') {
157 print FILTER " ],\n";