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require 'spec_helper'
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RSpec.describe Rex::Payloads::Meterpreter::UriChecksum do
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   class DummyClass
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     include Rex::Payloads::Meterpreter::UriChecksum
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   end
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  subject(:dummy_object) { DummyClass.new }
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  it { is_expected.to respond_to :generate_uri_checksum}
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  it { is_expected.to respond_to :process_uri_resource}
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  it { is_expected.to respond_to :uri_checksum_lookup}
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  describe '#process_uri_resource' do
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    context 'when passed a value for INITW' do
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      let(:uri) { "/7E37v"}
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      it 'returns a static value of /INITM' do
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        expect(dummy_object.process_uri_resource(uri)[:mode]).to eq :init_native
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      end
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      context 'with junk appended at the end' do
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        let(:uri) { "/7E37v_foobar"}
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        it 'returns a static value of /INITM' do
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          expect(dummy_object.process_uri_resource(uri)[:mode]).to eq nil
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        end
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      end
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    end
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    context 'when passed a value for INITJ' do
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      let(:uri) { "/a6BF9"}
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      it 'returns a static value of /INITJM' do
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        expect(dummy_object.process_uri_resource(uri)[:mode]).to eq :init_java
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      end
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      context 'with junk appended at the end' do
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        let(:uri) { "/a6BF9_foobar"}
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        it 'returns a static value of /INITJM' do
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          expect(dummy_object.process_uri_resource(uri)[:mode]).to eq nil
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        end
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      end
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    end
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    context 'when passed a value for CONN' do
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      let(:uri) { "/39ab3"}
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      it 'returns /CONN plus random junk' do
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        expect(dummy_object.process_uri_resource(uri)[:mode]).to eq :connect
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      end
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      context 'with junk appended at the end' do
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        let(:uri) { "/39ab3_foobar"}
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        it 'returns /CONN plus the junk' do
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          expect(dummy_object.process_uri_resource(uri)[:mode]).to eq nil
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        end
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      end
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    end
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    context 'when passed a junk value' do
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      let(:uri) { "/lolz"}
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      it 'returns the original uri string' do
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        expect(dummy_object.process_uri_resource(uri)[:mode]).to eq nil
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      end
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    end
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  end
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  describe '#generate_uri_checksum' do
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    [0, 80, 88, 90, 92, 98, 255, 127].each do |checksum_value|
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      [5,30,50,100,127].each do |uri_length|
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        ["", "/boom", "/___AAAAAAAAAAAAA"].each do |prefix|
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          it "generates a #{uri_length} byte string that checksums back to the original value (#{checksum_value}) with prefix #{prefix}" do
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            uri_string = dummy_object.generate_uri_checksum(checksum_value, uri_length + prefix.to_s.length, prefix)
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            expect(Rex::Text.checksum8(uri_string)).to eq checksum_value
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          end
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        end
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      end
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    end
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  end
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  describe '#uri_checksum_lookup' do
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    context 'when passed a value for :connect' do
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      let(:mode) { :connect }
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      it 'returns a URI_CHECKSUM_CONN' do
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        expect(dummy_object.uri_checksum_lookup(mode)).to eq Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_CONN
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      end
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    end
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    context 'when passed a value for :init_native' do
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      let(:mode) { :init_native }
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      it 'returns a URI_CHECKSUM_INITN' do
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        expect(dummy_object.uri_checksum_lookup(mode)).to eq Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITN
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      end
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    end
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    context 'when passed a value for :init_java' do
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      let(:mode) { :init_java }
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      it 'returns a URI_CHECKSUM_INITJ' do
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        expect(dummy_object.uri_checksum_lookup(mode)).to eq Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITJ
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      end
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    end
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    context 'when passed a value for :init_python' do
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      let(:mode) { :init_python }
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      it 'returns a URI_CHECKSUM_INITP' do
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        expect(dummy_object.uri_checksum_lookup(mode)).to eq Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITP
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      end
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    end
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  end
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end
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