[7a1c90d] | 1 | # These objects, initialized with an "OSCAR protocol template" from Net::OSCAR::XML::protoparse, |
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| 2 | # pack and unpack data according to the specification of that template. |
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| 3 | |
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| 4 | package Net::OSCAR::XML::Template; |
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| 5 | |
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| 6 | use strict; |
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| 7 | use warnings; |
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| 8 | |
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| 9 | use Net::OSCAR::XML; |
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| 10 | use Net::OSCAR::Common qw(:loglevels); |
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| 11 | use Net::OSCAR::Utility qw(hexdump); |
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| 12 | use Net::OSCAR::TLV; |
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| 13 | use Data::Dumper; |
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| 14 | use Carp; |
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| 15 | |
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| 16 | sub new($@) { |
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| 17 | my $class = shift; |
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| 18 | my $package = ref($class) || $class || "Net::OSCAR::XML::Template"; |
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| 19 | my $self = {template => $_[0]}; |
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| 20 | $self->{oscar} = $class->{oscar} if ref($class) and $class->{oscar}; |
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| 21 | bless $self, $package; |
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| 22 | return $self; |
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| 23 | } |
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| 24 | |
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| 25 | # Net::OSCAR::XML caches Template objects that don't have an associated OSCAR, |
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| 26 | # so that the same Template can be reused with multiple OSCAR objects. |
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| 27 | # Before returning a Template to the user, it calls set_oscar, so here we clone |
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| 28 | # ourself with the new OSCAR. |
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| 29 | # |
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| 30 | sub set_oscar($$) { |
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| 31 | my($self, $oscar) = @_; |
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| 32 | my $clone = $self->new($self->{template}); |
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| 33 | $clone->{oscar} = $oscar; |
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| 34 | return $clone; |
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| 35 | } |
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| 36 | |
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| 37 | |
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| 38 | # If given a scalar ref instead of a scalar as the second argument, |
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| 39 | # we will modify the packet in-place. |
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| 40 | sub unpack($$) { |
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| 41 | my ($self, $x_packet) = @_; |
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| 42 | my $oscar = $self->{oscar}; |
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| 43 | my $template = $self->{template}; |
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| 44 | my $packet = ref($x_packet) ? $$x_packet : $x_packet; |
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| 45 | |
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| 46 | my %data = (); |
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| 47 | |
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| 48 | $oscar->log_print_cond(OSCAR_DBG_XML, sub { "Decoding:\n", hexdump($packet), "\n according to: ", Data::Dumper::Dumper($template) }); |
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| 49 | |
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| 50 | assert(ref($template) eq "ARRAY"); |
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| 51 | foreach my $datum (@$template) { |
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| 52 | # In TLV chains, count refers to number of TLVs, not number of repetitions of the datum, so it defaults to infinite. |
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| 53 | my $count = $datum->{count} || ($datum->{type} eq "tlvchain" ? -1 : 1); |
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| 54 | my @results; |
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| 55 | |
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| 56 | |
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| 57 | ## Figure out how much input data this datum is dealing with |
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| 58 | |
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| 59 | if($datum->{prefix} and $datum->{prefix} eq "count") { |
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| 60 | ($count) = unpack($datum->{prefix_packlet}, substr($packet, 0, $datum->{prefix_len}, "")) || 0; |
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| 61 | } |
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| 62 | |
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| 63 | my $size = undef; |
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| 64 | if($datum->{type} eq "num") { |
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| 65 | if($count != -1) { |
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| 66 | $size = $datum->{len} * $count; |
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| 67 | } else { |
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| 68 | $size = length($packet); |
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| 69 | } |
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| 70 | } else { |
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| 71 | if($datum->{prefix} and $datum->{prefix} eq "length") { |
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| 72 | ($size) = unpack($datum->{prefix_packlet}, substr($packet, 0, $datum->{prefix_len}, "")); |
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| 73 | } elsif(exists($datum->{len})) { |
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| 74 | # In TLV chains, count is the number of TLVs, not a repeat |
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| 75 | # count for the datum. |
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| 76 | if($datum->{type} eq "tlvchain") { |
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| 77 | $size = $datum->{len}; |
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| 78 | } else { |
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| 79 | if($count == -1) { |
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| 80 | $size = length($packet); |
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| 81 | } else { |
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| 82 | $size = $datum->{len} * $count; |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | my $input; |
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| 89 | if(defined($size)) { |
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| 90 | $input = substr($packet, 0, $size, ""); |
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| 91 | } else { |
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| 92 | $input = $packet; |
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| 93 | } |
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| 94 | |
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| 95 | |
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| 96 | ## Okay, we have our input data -- act on it |
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| 97 | |
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| 98 | if($datum->{type} eq "num") { |
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| 99 | for(my $i = 0; ($input ne "") and ($count == -1 or $i < $count); $i++) { |
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| 100 | push @results, unpack($datum->{packlet}, substr($input, 0, $datum->{len}, "")); |
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| 101 | |
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| 102 | if(exists($datum->{enum_byval}) and exists($datum->{enum_byval}->{$results[-1]})) { |
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| 103 | $results[-1] = $datum->{enum_byval}->{$results[-1]}; |
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| 104 | } |
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| 105 | } |
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| 106 | } elsif($datum->{type} eq "data" or $datum->{type} eq "ref") { |
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| 107 | # If we just have simple, no preset length, no subitems, raw data, it can't have a repeat count, since the first repetition will gobble up everything |
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| 108 | assert($datum->{type} ne "data" or ($datum->{items} and @{$datum->{items}}) or defined($size) or $count == 1 or $datum->{null_terminated}); |
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| 109 | |
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| 110 | # We want: |
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| 111 | # <data length_prefix="num" /> |
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| 112 | # to be empty string, not undefined, when length==0. |
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| 113 | if(!$input and $count == 1 and defined($size)) { |
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| 114 | push @results, ""; |
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| 115 | } |
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| 116 | |
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| 117 | for(my $i = 0; $input and ($count == -1 or $i < $count); $i++) { |
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| 118 | # So, consider the structure: |
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| 119 | # <data name="foo"> |
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| 120 | # <word /> |
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| 121 | # <word /> |
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| 122 | # </data> |
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| 123 | # We don't know the size of 'foo' in advance. |
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| 124 | # Thus, we pass a reference to the actual packet into protopack. |
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| 125 | # subpacket will be modified to be the packet minus the bits that the contents of the data consumed. |
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| 126 | |
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| 127 | my %tmp; |
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| 128 | if($datum->{type} eq "data") { |
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| 129 | my $subinput; |
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| 130 | if($datum->{len}) { |
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| 131 | $subinput = substr($input, 0, $datum->{len}, ""); |
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| 132 | } elsif($datum->{null_terminated}) { |
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| 133 | $input =~ s/^(.*?)\0//; |
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| 134 | $subinput = $1; |
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| 135 | } else { |
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| 136 | $subinput = $input; |
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| 137 | $input = ""; |
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| 138 | } |
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| 139 | |
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| 140 | if(exists($datum->{pad})) { |
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| 141 | my $pad = chr($datum->{pad}); |
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| 142 | $subinput =~ s/$pad*$//; |
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| 143 | } |
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| 144 | |
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| 145 | if($datum->{items} and @{$datum->{items}}) { |
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| 146 | assert(!$datum->{null_terminated}); |
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| 147 | (%tmp) = $self->new($datum->{items})->unpack(\$subinput); |
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| 148 | $input = $subinput unless $datum->{len}; |
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| 149 | } else { |
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| 150 | $subinput =~ s/\0$// if $datum->{null_terminated}; |
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| 151 | |
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| 152 | # The simple case -- raw <data /> |
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| 153 | push @results, $subinput if $datum->{name}; |
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| 154 | } |
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| 155 | } elsif($datum->{type} eq "ref") { |
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| 156 | (%tmp) = protoparse($oscar, $datum->{name})->unpack(\$input); |
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| 157 | } |
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| 158 | |
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| 159 | push @results, \%tmp if %tmp; |
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| 160 | } |
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| 161 | } elsif($datum->{type} eq "tlvchain") { |
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| 162 | my @unknown; |
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| 163 | |
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| 164 | ## First set up a hash to store the data for each TLV, grouped by (sub)type |
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| 165 | ## |
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| 166 | my $tlvmap = tlv(); |
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| 167 | if($datum->{subtyped}) { |
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| 168 | foreach (@{$datum->{items}}) { |
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| 169 | $tlvmap->{$_->{num}} ||= tlv(); |
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| 170 | $tlvmap->{$_->{num}}->{$_->{subtype} || -1} = {%$_}; |
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| 171 | } |
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| 172 | } else { |
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| 173 | $tlvmap->{$_->{num}} = {%$_} foreach (@{$datum->{items}}); |
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| 174 | } |
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| 175 | |
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| 176 | ## Now, go through the chain and split the data into TLVs. |
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| 177 | ## |
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| 178 | for(my $i = 0; $input and ($count == -1 or $i < $count); $i++) { |
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| 179 | my %tlv; |
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| 180 | if($datum->{subtyped}) { |
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| 181 | (%tlv) = protoparse($oscar, "subtyped_TLV")->unpack(\$input); |
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| 182 | } else { |
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| 183 | (%tlv) = protoparse($oscar, "TLV")->unpack(\$input); |
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| 184 | } |
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| 185 | |
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| 186 | my $unknown = 0; |
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| 187 | if(!exists($tlvmap->{$tlv{type}})) { |
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| 188 | $tlvmap->{$tlv{type}} = $datum->{subtyped} ? tlv() : {}; |
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| 189 | $unknown = 1; |
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| 190 | } |
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| 191 | |
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| 192 | assert(!exists($tlv{name})) if exists($tlv{count}); |
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| 193 | if($datum->{subtyped}) { |
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| 194 | assert(exists($tlv{subtype})); |
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| 195 | |
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| 196 | if(!exists($tlvmap->{$tlv{type}}->{$tlv{subtype}})) { |
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| 197 | if(exists($tlvmap->{$tlv{type}}->{-1})) { |
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| 198 | $tlv{subtype} = -1; |
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| 199 | } else { |
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| 200 | $tlvmap->{$tlv{type}}->{$tlv{subtype}} = {}; |
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| 201 | $unknown = 1; |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | if(!$unknown) { |
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| 206 | my $type = $tlv{type}; |
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| 207 | my $subtype = $tlv{subtype}; |
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| 208 | $tlvmap->{$type}->{$subtype}->{data} ||= []; |
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| 209 | $tlvmap->{$type}->{$subtype}->{outdata} ||= []; |
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| 210 | |
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| 211 | $tlv{data} = "" if !defined($tlv{data}); |
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| 212 | push @{$tlvmap->{$type}->{$subtype}->{data}}, $tlv{data}; |
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| 213 | } else { |
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| 214 | push @unknown, { |
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| 215 | type => $tlv{type}, |
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| 216 | subtype => $tlv{subtype}, |
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| 217 | data => $tlv{data} |
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| 218 | }; |
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| 219 | } |
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| 220 | } else { |
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| 221 | if(!$unknown) { |
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| 222 | my $type = $tlv{type}; |
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| 223 | $tlvmap->{$type}->{data} ||= []; |
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| 224 | $tlvmap->{$type}->{outdata} ||= []; |
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| 225 | |
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| 226 | $tlv{data} = "" if !defined($tlv{data}); |
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| 227 | push @{$tlvmap->{$tlv{type}}->{data}}, $tlv{data}; |
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| 228 | } else { |
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| 229 | push @unknown, { |
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| 230 | type => $tlv{type}, |
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| 231 | data => $tlv{data} |
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| 232 | }; |
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| 233 | } |
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| 234 | } |
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| 235 | } |
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| 236 | |
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| 237 | ## Almost done! Go back through the hash we made earlier, which now has the |
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| 238 | ## data in it, and figure out which TLVs we want to emit. |
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| 239 | ## |
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| 240 | my @outvals; |
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| 241 | while(my($num, $val) = each %$tlvmap) { |
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| 242 | if($datum->{subtyped}) { |
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| 243 | while(my($subtype, $subval) = each %$val) { |
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| 244 | push @outvals, $subval if exists($subval->{data}); |
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| 245 | } |
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| 246 | } else { |
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| 247 | push @outvals, $val if exists($val->{data}); |
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| 248 | } |
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| 249 | } |
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| 250 | |
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| 251 | |
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| 252 | ## Okay, now take the TLVs to emit, and structure the output correctly |
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| 253 | ## for each thing-to-emit. We'll need to do one last phase of postprocessing |
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| 254 | ## so that we can group counted TLVs correctly. |
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| 255 | ## |
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| 256 | foreach my $val (@outvals) { |
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| 257 | foreach (@{$val->{data}}) { |
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| 258 | next unless exists($val->{items}); |
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| 259 | my(%tmp) = $self->new($val->{items})->unpack($_); |
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| 260 | # We want: |
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| 261 | # <tlv type="1"><data name="x" /></tlv> |
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| 262 | # to give x => "" when TLV 1 is present but empty, |
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| 263 | # not x => undef. |
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| 264 | if(@{$val->{items}} == 1 and $val->{items}->[0]->{name}) { |
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| 265 | my $name = $val->{items}->[0]->{name}; |
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| 266 | $tmp{$name} = "" if !defined($tmp{$name}); |
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| 267 | } |
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| 268 | |
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| 269 | if(@{$val->{items}}) { |
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| 270 | push @{$val->{outdata}}, \%tmp; |
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| 271 | } else { |
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| 272 | push @{$val->{outdata}}, ""; |
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| 273 | } |
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| 274 | } |
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| 275 | } |
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| 276 | |
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| 277 | |
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| 278 | ## Okay, we've stashed the output (formatted data structures) for each TLV. |
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| 279 | ## Now we need to merge these into results. |
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| 280 | ## This is normally just pushing everything out to results, as a hashref |
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| 281 | ## under the TLVs name for named TLVs, but counted TLVs also need to |
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| 282 | ## be layered into an array. |
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| 283 | ## |
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| 284 | foreach my $val (@outvals) { |
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| 285 | if(exists($val->{count})) { |
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| 286 | if(exists($val->{name})) { |
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| 287 | push @results, { |
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| 288 | $val->{name} => $val->{outdata} |
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| 289 | }; |
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| 290 | } else { |
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| 291 | push @results, $val->{outdata}->[0]; |
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| 292 | } |
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| 293 | } else { |
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| 294 | if(exists($val->{name})) { |
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| 295 | push @results, { |
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| 296 | $val->{name} => $val->{outdata}->[0] |
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| 297 | }; |
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| 298 | } else { |
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| 299 | push @results, $val->{outdata}->[0]; |
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| 300 | } |
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| 301 | } |
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| 302 | } |
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| 303 | |
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| 304 | push @results, {__UNKNOWN => [@unknown]} if @unknown; |
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| 305 | } |
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| 306 | |
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| 307 | |
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| 308 | # If we didn't know the length of the datum in advance, |
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| 309 | # we've been modifying the entire packet in-place. |
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| 310 | $packet = $input if !defined($size); |
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| 311 | |
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| 312 | |
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| 313 | ## Okay, we have the results from this datum, store them away. |
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| 314 | |
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| 315 | if($datum->{name}) { |
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| 316 | if($datum->{count} or ($datum->{prefix} and $datum->{prefix} eq "count")) { |
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| 317 | $data{$datum->{name}} = \@results; |
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| 318 | } elsif( |
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| 319 | $datum->{type} eq "ref" or |
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| 320 | (ref($datum->{items}) and @{$datum->{items}}) |
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| 321 | ) { |
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| 322 | $data{$_} = $results[0]->{$_} foreach keys %{$results[0]}; |
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| 323 | } else { |
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| 324 | $data{$datum->{name}} = $results[0]; |
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| 325 | } |
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| 326 | } elsif(@results) { |
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| 327 | foreach my $result(@results) { |
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| 328 | next unless ref($result); |
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| 329 | $data{$_} = $result->{$_} foreach keys %$result; |
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| 330 | } |
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| 331 | } |
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| 332 | } |
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| 333 | |
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| 334 | $oscar->log_print_cond(OSCAR_DBG_XML, sub { "Decoded:\n", join("\n", map { "\t$_ => ".(defined($data{$_}) ? hexdump($data{$_}) : 'undef') } keys %data) }); |
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| 335 | |
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| 336 | # Remember, passing in a ref to packet in place of actual packet data == in-place editing... |
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| 337 | $$x_packet = $packet if ref($x_packet); |
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| 338 | |
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| 339 | return %data; |
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| 340 | } |
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| 341 | |
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| 342 | |
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| 343 | sub pack($%) { |
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| 344 | my($self, %data) = @_; |
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| 345 | my $packet = ""; |
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| 346 | my $oscar = $self->{oscar}; |
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| 347 | my $template = $self->{template}; |
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| 348 | |
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| 349 | $oscar->log_print_cond(OSCAR_DBG_XML, sub { "Encoding:\n", join("\n", map { "\t$_ => ".(defined($data{$_}) ? hexdump($data{$_}) : 'undef') } keys %data), "\n according to: ", Data::Dumper::Dumper($template) }); |
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| 350 | |
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| 351 | assert(ref($template) eq "ARRAY"); |
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| 352 | foreach my $datum (@$template) { |
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| 353 | my $output = undef; |
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| 354 | |
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| 355 | ## Figure out what we're packing |
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| 356 | my $value = undef; |
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| 357 | $value = $data{$datum->{name}} if $datum->{name}; |
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| 358 | $value = $datum->{value} if !defined($value); |
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| 359 | my @valarray = ref($value) eq "ARRAY" ? @$value : ($value); # Don't modify $value in-place! |
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| 360 | |
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| 361 | $datum->{count} = @valarray if $datum->{prefix} and $datum->{prefix} eq "count"; |
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| 362 | my $max_count = exists($datum->{count}) ? $datum->{count} : 1; |
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| 363 | my $count = 0; |
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| 364 | |
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| 365 | assert($max_count == -1 or @valarray <= $max_count); |
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| 366 | |
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| 367 | |
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| 368 | ## Pack it |
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| 369 | if($datum->{type} eq "num") { |
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| 370 | next unless defined($value); |
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| 371 | |
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| 372 | for($count = 0; ($max_count == -1 or $count < $max_count) and @valarray; $count++) { |
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| 373 | my $val = shift @valarray; |
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| 374 | if(exists($datum->{enum_byname}) and exists($datum->{enum_byname}->{$val})) { |
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| 375 | $val = $datum->{enum_byname}->{$val}; |
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| 376 | } |
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| 377 | |
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| 378 | $output .= pack($datum->{packlet}, $val); |
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| 379 | } |
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| 380 | } elsif($datum->{type} eq "data" or $datum->{type} eq "ref") { |
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| 381 | for($count = 0; ($max_count == -1 or $count < $max_count) and @valarray; $count++) { |
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| 382 | my $val = shift @valarray; |
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| 383 | |
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| 384 | if($datum->{items} and @{$datum->{items}}) { |
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| 385 | $output .= $self->new($datum->{items})->pack(ref($val) ? %$val : %data); |
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| 386 | } elsif($datum->{type} eq "ref") { |
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| 387 | assert($max_count == 1 or (ref($val) and ref($val) eq "HASH")); |
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| 388 | $output .= protoparse($oscar, $datum->{name})->pack(ref($val) ? %$val : %data); |
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| 389 | } else { |
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| 390 | $output .= $val if defined($val); |
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| 391 | } |
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| 392 | |
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| 393 | $output .= chr(0) if $datum->{null_terminated}; |
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| 394 | if(exists($datum->{pad})) { |
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| 395 | assert(exists($datum->{len}) and exists($datum->{pad})); |
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| 396 | |
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| 397 | my $outlen = defined($output) ? length($output) : 0; |
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| 398 | my $pad_needed = $datum->{len} - $outlen; |
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| 399 | $output .= chr($datum->{pad}) x $pad_needed if $pad_needed; |
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| 400 | } |
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| 401 | } |
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| 402 | } elsif($datum->{type} eq "tlvchain") { |
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| 403 | foreach my $tlv (@{$datum->{items}}) { |
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| 404 | my $tlvdata = undef; |
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| 405 | |
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| 406 | if(exists($tlv->{name})) { |
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| 407 | if(exists($data{$tlv->{name}})) { |
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| 408 | if(@{$tlv->{items}}) { |
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| 409 | assert(ref($data{$tlv->{name}}) eq "HASH" or ref($data{$tlv->{name}}) eq "ARRAY"); |
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| 410 | if(ref($data{$tlv->{name}}) eq "ARRAY") { |
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| 411 | $tlvdata = []; |
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| 412 | push @$tlvdata, $self->new($tlv->{items})->pack(%$_) foreach @{$data{$tlv->{name}}}; |
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| 413 | } else { |
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| 414 | $tlvdata = [$self->new($tlv->{items})->pack(%{$data{$tlv->{name}}})]; |
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| 415 | } |
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| 416 | } else { |
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| 417 | $tlvdata = [""] if defined($data{$tlv->{name}}); |
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| 418 | } |
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| 419 | } elsif(exists($tlv->{value}) and !@{$tlv->{items}}) { |
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| 420 | $tlvdata = [$tlv->{value}]; |
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| 421 | } |
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| 422 | } else { |
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| 423 | my $tmp = $self->new($tlv->{items})->pack(%data); |
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| 424 | |
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| 425 | # If TLV has no name and only one element, do special handling for "present but empty" value. |
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| 426 | if($tmp ne "") { |
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| 427 | $tlvdata = [$tmp]; |
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| 428 | } elsif(@{$tlv->{items}} == 1 and $tlv->{items}->[0]->{name} and exists($data{$tlv->{items}->[0]->{name}})) { |
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| 429 | $tlvdata = [""]; |
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| 430 | } elsif(!@{$tlv->{items}} and exists($tlv->{value})) { |
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| 431 | $tlvdata = [$tlv->{value}]; |
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| 432 | } |
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| 433 | } |
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| 434 | |
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| 435 | assert($tlv->{num}); |
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| 436 | next unless defined($tlvdata); |
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| 437 | |
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| 438 | $count++; |
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| 439 | if($datum->{subtyped}) { |
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| 440 | my $subtype = 0; |
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| 441 | assert(exists($tlv->{subtype})); |
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| 442 | $subtype = $tlv->{subtype} if $tlv->{subtype} != -1; |
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| 443 | |
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| 444 | $output .= protoparse($oscar, "subtyped_TLV")->pack( |
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| 445 | type => $tlv->{num}, |
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| 446 | subtype => $subtype, |
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| 447 | data => $_ |
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| 448 | ) foreach @$tlvdata; |
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| 449 | } else { |
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| 450 | $output .= protoparse($oscar, "TLV")->pack( |
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| 451 | type => $tlv->{num}, |
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| 452 | data => $_ |
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| 453 | ) foreach @$tlvdata; |
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| 454 | } |
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| 455 | } |
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| 456 | } |
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| 457 | |
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| 458 | |
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| 459 | ## Handle any prefixes |
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| 460 | if($datum->{prefix} and defined($output)) { |
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| 461 | if($datum->{prefix} eq "count") { |
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| 462 | $packet .= pack($datum->{prefix_packlet}, $count); |
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| 463 | } else { |
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| 464 | $packet .= pack($datum->{prefix_packlet}, length($output)); |
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| 465 | } |
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| 466 | } |
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| 467 | |
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| 468 | $packet .= $output if defined($output); |
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| 469 | } |
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| 470 | |
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| 471 | $oscar->log_print_cond(OSCAR_DBG_XML, sub { "Encoded:\n", hexdump($packet) }); |
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| 472 | return $packet; |
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| 473 | } |
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| 474 | |
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| 475 | |
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| 476 | sub assert($) { |
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| 477 | my $test = shift; |
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| 478 | return if $test; |
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| 479 | confess("Net::OSCAR internal error"); |
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| 480 | } |
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| 481 | |
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| 482 | # Why isn't this imported properly?? |
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| 483 | sub protoparse { Net::OSCAR::XML::protoparse(@_); } |
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| 484 | |
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| 485 | 1; |
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