Examples with ApfGenerator android.net.apf.ApfGenerator used on opensource projects

Example 6 with ApfGenerator

use of android.net.apf.ApfGenerator in project android_frameworks_base by DirtyUnicorns.

the class Bpf2Apf method main.

/**
     * Convert the output of "tcpdump -d" (human readable BPF program dump) piped in stdin into an
     * APF program and output it via stdout.
     */
public static void main(String[] args) throws Exception {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String line = null;
    StringBuilder responseData = new StringBuilder();
    ApfGenerator gen = new ApfGenerator();
    while ((line = in.readLine()) != null) convertLine(line, gen);
    System.out.write(gen.generate());
}

Example 7 with ApfGenerator

use of android.net.apf.ApfGenerator in project android_frameworks_base by crdroidandroid.

the class ApfFilter method beginProgramLocked.

/**
     * Begin generating an APF program to:
     * <ul>
     * <li>Drop ARP requests not for us, if mIPv4Address is set,
     * <li>Drop IPv4 broadcast packets, except DHCP destined to our MAC,
     * <li>Drop IPv4 multicast packets, if mMulticastFilter,
     * <li>Pass all other IPv4 packets,
     * <li>Drop all broadcast non-IP non-ARP packets.
     * <li>Pass all non-ICMPv6 IPv6 packets,
     * <li>Pass all non-IPv4 and non-IPv6 packets,
     * <li>Drop IPv6 ICMPv6 NAs to ff02::1.
     * <li>Drop IPv6 ICMPv6 RSs.
     * <li>Let execution continue off the end of the program for IPv6 ICMPv6 packets. This allows
     *     insertion of RA filters here, or if there aren't any, just passes the packets.
     * </ul>
     */
@GuardedBy("this")
private ApfGenerator beginProgramLocked() throws IllegalInstructionException {
    ApfGenerator gen = new ApfGenerator();
    // This is guaranteed to return true because of the check in maybeCreate.
    gen.setApfVersion(mApfCapabilities.apfVersionSupported);
    // Here's a basic summary of what the initial program does:
    //
    // if it's ARP:
    //   insert ARP filter to drop or pass these appropriately
    // if it's IPv4:
    //   insert IPv4 filter to drop or pass these appropriately
    // if it's not IPv6:
    //   if it's broadcast:
    //     drop
    //   pass
    // insert IPv6 filter to drop, pass, or fall off the end for ICMPv6 packets
    // Add ARP filters:
    String skipArpFiltersLabel = "skipArpFilters";
    gen.addLoad16(Register.R0, ETH_ETHERTYPE_OFFSET);
    gen.addJumpIfR0NotEquals(ETH_P_ARP, skipArpFiltersLabel);
    generateArpFilterLocked(gen);
    gen.defineLabel(skipArpFiltersLabel);
    // Add IPv4 filters:
    String skipIPv4FiltersLabel = "skipIPv4Filters";
    // NOTE: Relies on R0 containing ethertype. This is safe because if we got here, we did not
    // execute the ARP filter, since that filter does not fall through, but either drops or
    // passes.
    gen.addJumpIfR0NotEquals(ETH_P_IP, skipIPv4FiltersLabel);
    generateIPv4FilterLocked(gen);
    gen.defineLabel(skipIPv4FiltersLabel);
    // Check for IPv6:
    // NOTE: Relies on R0 containing ethertype. This is safe because if we got here, we did not
    // execute the ARP or IPv4 filters, since those filters do not fall through, but either
    // drop or pass.
    String ipv6FilterLabel = "IPv6Filters";
    gen.addJumpIfR0Equals(ETH_P_IPV6, ipv6FilterLabel);
    // Drop non-IP non-ARP broadcasts, pass the rest
    gen.addLoadImmediate(Register.R0, ETH_DEST_ADDR_OFFSET);
    gen.addJumpIfBytesNotEqual(Register.R0, ETH_BROADCAST_MAC_ADDRESS, gen.PASS_LABEL);
    gen.addJump(gen.DROP_LABEL);
    // Add IPv6 filters:
    gen.defineLabel(ipv6FilterLabel);
    generateIPv6FilterLocked(gen);
    return gen;
}

Example 8 with ApfGenerator

use of android.net.apf.ApfGenerator in project android_frameworks_base by crdroidandroid.

the class ApfFilter method installNewProgramLocked.

/**
     * Generate and install a new filter program.
     */
@GuardedBy("this")
@VisibleForTesting
void installNewProgramLocked() {
    purgeExpiredRasLocked();
    ArrayList<Ra> rasToFilter = new ArrayList<>();
    final byte[] program;
    long programMinLifetime = Long.MAX_VALUE;
    try {
        // Step 1: Determine how many RA filters we can fit in the program.
        ApfGenerator gen = beginProgramLocked();
        for (Ra ra : mRas) {
            ra.generateFilterLocked(gen);
            // Stop if we get too big.
            if (gen.programLengthOverEstimate() > mApfCapabilities.maximumApfProgramSize)
                break;
            rasToFilter.add(ra);
        }
        // Step 2: Actually generate the program
        gen = beginProgramLocked();
        for (Ra ra : rasToFilter) {
            programMinLifetime = Math.min(programMinLifetime, ra.generateFilterLocked(gen));
        }
        // Execution will reach the end of the program if no filters match, which will pass the
        // packet to the AP.
        program = gen.generate();
    } catch (IllegalInstructionException e) {
        Log.e(TAG, "Program failed to generate: ", e);
        return;
    }
    mLastTimeInstalledProgram = curTime();
    mLastInstalledProgramMinLifetime = programMinLifetime;
    mLastInstalledProgram = program;
    mNumProgramUpdates++;
    if (VDBG) {
        hexDump("Installing filter: ", program, program.length);
    }
    mIpManagerCallback.installPacketFilter(program);
    int flags = ApfProgramEvent.flagsFor(mIPv4Address != null, mMulticastFilter);
    mMetricsLog.log(new ApfProgramEvent(programMinLifetime, rasToFilter.size(), mRas.size(), program.length, flags));
}

Example 9 with ApfGenerator

use of android.net.apf.ApfGenerator in project android_frameworks_base by crdroidandroid.

the class ApfTest method testApfInstructions.

/**
     * Test each instruction by generating a program containing the instruction,
     * generating bytecode for that program and running it through the
     * interpreter to verify it functions correctly.
     */
@LargeTest
public void testApfInstructions() throws IllegalInstructionException {
    // Empty program should pass because having the program counter reach the
    // location immediately after the program indicates the packet should be
    // passed to the AP.
    ApfGenerator gen = new ApfGenerator();
    assertPass(gen);
    // Test jumping to pass label.
    gen = new ApfGenerator();
    gen.addJump(gen.PASS_LABEL);
    byte[] program = gen.generate();
    assertEquals(1, program.length);
    assertEquals((14 << 3) | (0 << 1) | 0, program[0]);
    assertPass(program, new byte[MIN_PKT_SIZE], 0);
    // Test jumping to drop label.
    gen = new ApfGenerator();
    gen.addJump(gen.DROP_LABEL);
    program = gen.generate();
    assertEquals(2, program.length);
    assertEquals((14 << 3) | (1 << 1) | 0, program[0]);
    assertEquals(1, program[1]);
    assertDrop(program, new byte[15], 15);
    // Test jumping if equal to 0.
    gen = new ApfGenerator();
    gen.addJumpIfR0Equals(0, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if not equal to 0.
    gen = new ApfGenerator();
    gen.addJumpIfR0NotEquals(0, gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfR0NotEquals(0, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if registers equal.
    gen = new ApfGenerator();
    gen.addJumpIfR0EqualsR1(gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if registers not equal.
    gen = new ApfGenerator();
    gen.addJumpIfR0NotEqualsR1(gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfR0NotEqualsR1(gen.DROP_LABEL);
    assertDrop(gen);
    // Test load immediate.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test add.
    gen = new ApfGenerator();
    gen.addAdd(1234567890);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test subtract.
    gen = new ApfGenerator();
    gen.addAdd(-1234567890);
    gen.addJumpIfR0Equals(-1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test or.
    gen = new ApfGenerator();
    gen.addOr(1234567890);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test and.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addAnd(123456789);
    gen.addJumpIfR0Equals(1234567890 & 123456789, gen.DROP_LABEL);
    assertDrop(gen);
    // Test left shift.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLeftShift(1);
    gen.addJumpIfR0Equals(1234567890 << 1, gen.DROP_LABEL);
    assertDrop(gen);
    // Test right shift.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addRightShift(1);
    gen.addJumpIfR0Equals(1234567890 >> 1, gen.DROP_LABEL);
    assertDrop(gen);
    // Test multiply.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addMul(2);
    gen.addJumpIfR0Equals(1234567890 * 2, gen.DROP_LABEL);
    assertDrop(gen);
    // Test divide.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addDiv(2);
    gen.addJumpIfR0Equals(1234567890 / 2, gen.DROP_LABEL);
    assertDrop(gen);
    // Test divide by zero.
    gen = new ApfGenerator();
    gen.addDiv(0);
    gen.addJump(gen.DROP_LABEL);
    assertPass(gen);
    // Test add.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1234567890);
    gen.addAddR1();
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test subtract.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, -1234567890);
    gen.addAddR1();
    gen.addJumpIfR0Equals(-1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test or.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1234567890);
    gen.addOrR1();
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test and.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLoadImmediate(Register.R1, 123456789);
    gen.addAndR1();
    gen.addJumpIfR0Equals(1234567890 & 123456789, gen.DROP_LABEL);
    assertDrop(gen);
    // Test left shift.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLoadImmediate(Register.R1, 1);
    gen.addLeftShiftR1();
    gen.addJumpIfR0Equals(1234567890 << 1, gen.DROP_LABEL);
    assertDrop(gen);
    // Test right shift.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLoadImmediate(Register.R1, -1);
    gen.addLeftShiftR1();
    gen.addJumpIfR0Equals(1234567890 >> 1, gen.DROP_LABEL);
    assertDrop(gen);
    // Test multiply.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLoadImmediate(Register.R1, 2);
    gen.addMulR1();
    gen.addJumpIfR0Equals(1234567890 * 2, gen.DROP_LABEL);
    assertDrop(gen);
    // Test divide.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addLoadImmediate(Register.R1, 2);
    gen.addDivR1();
    gen.addJumpIfR0Equals(1234567890 / 2, gen.DROP_LABEL);
    assertDrop(gen);
    // Test divide by zero.
    gen = new ApfGenerator();
    gen.addDivR1();
    gen.addJump(gen.DROP_LABEL);
    assertPass(gen);
    // Test byte load.
    gen = new ApfGenerator();
    gen.addLoad8(Register.R0, 1);
    gen.addJumpIfR0Equals(45, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test out of bounds load.
    gen = new ApfGenerator();
    gen.addLoad8(Register.R0, 16);
    gen.addJumpIfR0Equals(0, gen.DROP_LABEL);
    assertPass(gen, new byte[] { 123, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test half-word load.
    gen = new ApfGenerator();
    gen.addLoad16(Register.R0, 1);
    gen.addJumpIfR0Equals((45 << 8) | 67, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 67, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test word load.
    gen = new ApfGenerator();
    gen.addLoad32(Register.R0, 1);
    gen.addJumpIfR0Equals((45 << 24) | (67 << 16) | (89 << 8) | 12, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 67, 89, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test byte indexed load.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1);
    gen.addLoad8Indexed(Register.R0, 0);
    gen.addJumpIfR0Equals(45, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test out of bounds indexed load.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 8);
    gen.addLoad8Indexed(Register.R0, 8);
    gen.addJumpIfR0Equals(0, gen.DROP_LABEL);
    assertPass(gen, new byte[] { 123, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test half-word indexed load.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1);
    gen.addLoad16Indexed(Register.R0, 0);
    gen.addJumpIfR0Equals((45 << 8) | 67, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 67, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test word indexed load.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1);
    gen.addLoad32Indexed(Register.R0, 0);
    gen.addJumpIfR0Equals((45 << 24) | (67 << 16) | (89 << 8) | 12, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 123, 45, 67, 89, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
    // Test jumping if greater than.
    gen = new ApfGenerator();
    gen.addJumpIfR0GreaterThan(0, gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfR0GreaterThan(0, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if less than.
    gen = new ApfGenerator();
    gen.addJumpIfR0LessThan(0, gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addJumpIfR0LessThan(1, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if any bits set.
    gen = new ApfGenerator();
    gen.addJumpIfR0AnyBitsSet(3, gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfR0AnyBitsSet(3, gen.DROP_LABEL);
    assertDrop(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 3);
    gen.addJumpIfR0AnyBitsSet(3, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if register greater than.
    gen = new ApfGenerator();
    gen.addJumpIfR0GreaterThanR1(gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 2);
    gen.addLoadImmediate(Register.R1, 1);
    gen.addJumpIfR0GreaterThanR1(gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if register less than.
    gen = new ApfGenerator();
    gen.addJumpIfR0LessThanR1(gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1);
    gen.addJumpIfR0LessThanR1(gen.DROP_LABEL);
    assertDrop(gen);
    // Test jumping if any bits set in register.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 3);
    gen.addJumpIfR0AnyBitsSetR1(gen.DROP_LABEL);
    assertPass(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 3);
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfR0AnyBitsSetR1(gen.DROP_LABEL);
    assertDrop(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 3);
    gen.addLoadImmediate(Register.R0, 3);
    gen.addJumpIfR0AnyBitsSetR1(gen.DROP_LABEL);
    assertDrop(gen);
    // Test load from memory.
    gen = new ApfGenerator();
    gen.addLoadFromMemory(Register.R0, 0);
    gen.addJumpIfR0Equals(0, gen.DROP_LABEL);
    assertDrop(gen);
    // Test store to memory.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1234567890);
    gen.addStoreToMemory(Register.R1, 12);
    gen.addLoadFromMemory(Register.R0, 12);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test filter age pre-filled memory.
    gen = new ApfGenerator();
    gen.addLoadFromMemory(Register.R0, gen.FILTER_AGE_MEMORY_SLOT);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen, new byte[MIN_PKT_SIZE], 1234567890);
    // Test packet size pre-filled memory.
    gen = new ApfGenerator();
    gen.addLoadFromMemory(Register.R0, gen.PACKET_SIZE_MEMORY_SLOT);
    gen.addJumpIfR0Equals(MIN_PKT_SIZE, gen.DROP_LABEL);
    assertDrop(gen);
    // Test IPv4 header size pre-filled memory.
    gen = new ApfGenerator();
    gen.addLoadFromMemory(Register.R0, gen.IPV4_HEADER_SIZE_MEMORY_SLOT);
    gen.addJumpIfR0Equals(20, gen.DROP_LABEL);
    assertDrop(gen, new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x45 }, 0);
    // Test not.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addNot(Register.R0);
    gen.addJumpIfR0Equals(~1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test negate.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addNeg(Register.R0);
    gen.addJumpIfR0Equals(-1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test move.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1234567890);
    gen.addMove(Register.R0);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addMove(Register.R1);
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    // Test swap.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R1, 1234567890);
    gen.addSwap();
    gen.addJumpIfR0Equals(1234567890, gen.DROP_LABEL);
    assertDrop(gen);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1234567890);
    gen.addSwap();
    gen.addJumpIfR0Equals(0, gen.DROP_LABEL);
    assertDrop(gen);
    // Test jump if bytes not equal.
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfBytesNotEqual(Register.R0, new byte[] { 123 }, gen.DROP_LABEL);
    program = gen.generate();
    assertEquals(6, program.length);
    assertEquals((13 << 3) | (1 << 1) | 0, program[0]);
    assertEquals(1, program[1]);
    assertEquals(((20 << 3) | (1 << 1) | 0) - 256, program[2]);
    assertEquals(1, program[3]);
    assertEquals(1, program[4]);
    assertEquals(123, program[5]);
    assertDrop(program, new byte[MIN_PKT_SIZE], 0);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfBytesNotEqual(Register.R0, new byte[] { 123 }, gen.DROP_LABEL);
    byte[] packet123 = { 0, 123, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    assertPass(gen, packet123, 0);
    gen = new ApfGenerator();
    gen.addJumpIfBytesNotEqual(Register.R0, new byte[] { 123 }, gen.DROP_LABEL);
    assertDrop(gen, packet123, 0);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfBytesNotEqual(Register.R0, new byte[] { 1, 2, 30, 4, 5 }, gen.DROP_LABEL);
    byte[] packet12345 = { 0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    assertDrop(gen, packet12345, 0);
    gen = new ApfGenerator();
    gen.addLoadImmediate(Register.R0, 1);
    gen.addJumpIfBytesNotEqual(Register.R0, new byte[] { 1, 2, 3, 4, 5 }, gen.DROP_LABEL);
    assertPass(gen, packet12345, 0);
}

Example 10 with ApfGenerator

use of android.net.apf.ApfGenerator in project android_frameworks_base by crdroidandroid.

the class Bpf2Apf method main.

/**
     * Convert the output of "tcpdump -d" (human readable BPF program dump) piped in stdin into an
     * APF program and output it via stdout.
     */
public static void main(String[] args) throws Exception {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String line = null;
    StringBuilder responseData = new StringBuilder();
    ApfGenerator gen = new ApfGenerator();
    while ((line = in.readLine()) != null) convertLine(line, gen);
    System.out.write(gen.generate());
}