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Commit c2cdb2c7 authored by Frank Li's avatar Frank Li Committed by Automerger Merge Worker
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Fix NullPointerException on addErrorCode when input is Invalid error code am: ad90e1bf 

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/11987398

Change-Id: I78c4025468341c9a515bcedd83cf19ea6795e283
parents 4a61b59c ad90e1bf

src/com/android/networkstack/metrics/IpProvisioningMetrics.java

+10 −1
Original line number Diff line number Diff line
@@ -120,12 +120,21 @@ public class IpProvisioningMetrics { 
                transSuccess ? HostnameTransResult.HTR_SUCCESS : HostnameTransResult.HTR_FAILURE);

    }



    private static DhcpErrorCode dhcpErrorFromNumberSafe(int number) {

        // See DhcpErrorCode.errorCodeWithOption

        // TODO: add a DhcpErrorCode method to extract the code;

        //       or replace legacy error codes with the new metrics.

        final DhcpErrorCode error = DhcpErrorCode.forNumber(number & 0xFFFF0000);

        if (error == null) return DhcpErrorCode.ET_UNKNOWN;

        return error;

    }



    /**

     * write the DHCP error code into DhcpSession.

     */

    public void addDhcpErrorCode(final int errorCode) {

        if (mDhcpSessionBuilder.getErrorCodeCount() >= MAX_DHCP_ERROR_COUNT) return;

        mDhcpSessionBuilder.addErrorCode(DhcpErrorCode.forNumber(errorCode));

        mDhcpSessionBuilder.addErrorCode(dhcpErrorFromNumberSafe(errorCode));

    }



    /**

tests/unit/src/com/android/networkstack/metrics/NetworkIpProvisioningMetricsTest.java

+14 −14
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 


package com.android.networkstack.metrics;



import android.net.dhcp.DhcpPacket;

import android.net.metrics.DhcpErrorEvent;

import android.stats.connectivity.DhcpErrorCode;

import android.stats.connectivity.DhcpFeature;
@@ -64,25 +65,24 @@ public class NetworkIpProvisioningMetricsTest { 
        final NetworkIpProvisioningReported mStats;

        final IpProvisioningMetrics mMetrics = new IpProvisioningMetrics();

        mMetrics.reset();

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.DHCP_ERROR);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.L2_WRONG_ETH_TYPE);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.L3_INVALID_IP);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.L4_WRONG_PORT);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.BOOTP_TOO_SHORT);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.DHCP_NO_COOKIE);

        mMetrics.addDhcpErrorCode(DhcpErrorEvent.errorCodeWithOption(

                DhcpErrorEvent.BUFFER_UNDERFLOW, DhcpPacket.DHCP_HOST_NAME));

        // Write the incorrect input number 50000 as DHCP error number

        int incorrectErrorCodeNumber = 50000;

        mMetrics.addDhcpErrorCode(incorrectErrorCodeNumber);

        for (int i = 0; i < mMetrics.MAX_DHCP_ERROR_COUNT; i++) {

            mMetrics.addDhcpErrorCode(DhcpErrorEvent.PARSING_ERROR);

        }

        mStats = mMetrics.statsWrite();

        assertEquals(DhcpErrorCode.ET_DHCP_ERROR, mStats.getDhcpSession().getErrorCode(0));

        assertEquals(DhcpErrorCode.ET_L2_WRONG_ETH_TYPE, mStats.getDhcpSession().getErrorCode(1));

        assertEquals(DhcpErrorCode.ET_L3_INVALID_IP, mStats.getDhcpSession().getErrorCode(2));

        assertEquals(DhcpErrorCode.ET_L4_WRONG_PORT, mStats.getDhcpSession().getErrorCode(3));

        assertEquals(DhcpErrorCode.ET_BOOTP_TOO_SHORT, mStats.getDhcpSession().getErrorCode(4));

        assertEquals(DhcpErrorCode.ET_DHCP_NO_COOKIE, mStats.getDhcpSession().getErrorCode(5));

        // Check can record the same error code

        assertEquals(DhcpErrorCode.ET_PARSING_ERROR, mStats.getDhcpSession().getErrorCode(6));

        assertEquals(DhcpErrorCode.ET_PARSING_ERROR, mStats.getDhcpSession().getErrorCode(6));

        assertEquals(DhcpErrorCode.ET_BOOTP_TOO_SHORT, mStats.getDhcpSession().getErrorCode(0));

        assertEquals(DhcpErrorCode.ET_BUFFER_UNDERFLOW, mStats.getDhcpSession().getErrorCode(1));

        // When the input is an invalid integer value (such as incorrectErrorCodeNumber),

        // the DhcpErrorCode will be ET_UNKNOWN

        assertEquals(DhcpErrorCode.ET_UNKNOWN, mStats.getDhcpSession().getErrorCode(2));

        // If the same error code appears, it must be recorded

        assertEquals(DhcpErrorCode.ET_PARSING_ERROR, mStats.getDhcpSession().getErrorCode(3));

        assertEquals(DhcpErrorCode.ET_PARSING_ERROR, mStats.getDhcpSession().getErrorCode(4));

        // The maximum number of DHCP error code counts is MAX_DHCP_ERROR_COUNT

        assertEquals(mMetrics.MAX_DHCP_ERROR_COUNT, mStats.getDhcpSession().getErrorCodeCount());

    }