firmware/test/test_position_precision/test_main.cpp

#include "Channels.h"
#include "PositionPrecision.h"
#include "TestUtil.h"
#include "mesh-pb-constants.h"
#include <cstring>
#include <unity.h>

static meshtastic_Position makePosition()
{
    meshtastic_Position position = meshtastic_Position_init_default;
    position.has_latitude_i = true;
    position.latitude_i = static_cast<int32_t>(0x12345678);
    position.has_longitude_i = true;
    position.longitude_i = static_cast<int32_t>(0x22345678);
    position.has_altitude = true;
    position.altitude = 123;
    position.time = 42;
    position.location_source = meshtastic_Position_LocSource_LOC_EXTERNAL;
    position.timestamp = 43;
    position.sats_in_view = 10;
    return position;
}

static meshtastic_Channel makeChannel(meshtastic_Channel_Role role, bool hasModuleSettings, uint32_t positionPrecision)
{
    meshtastic_Channel channel = meshtastic_Channel_init_default;
    channel.has_settings = true;
    channel.role = role;
    channel.settings.has_module_settings = hasModuleSettings;
    channel.settings.module_settings.position_precision = positionPrecision;
    return channel;
}

static void test_applyPositionPrecision_clampsLatLonAndSetsPrecisionBits()
{
    meshtastic_Position position = makePosition();

    applyPositionPrecision(position, 16);

    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x12348000), position.latitude_i);
    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x22348000), position.longitude_i);
    TEST_ASSERT_EQUAL_UINT32(16, position.precision_bits);
    TEST_ASSERT_TRUE(position.has_latitude_i);
    TEST_ASSERT_TRUE(position.has_longitude_i);
}

static void test_applyPositionPrecision_fullPrecisionKeepsLatLon()
{
    meshtastic_Position position = makePosition();

    applyPositionPrecision(position, 32);

    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x12345678), position.latitude_i);
    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x22345678), position.longitude_i);
    TEST_ASSERT_EQUAL_UINT32(32, position.precision_bits);
}

static void test_applyPositionPrecision_zeroScrubsLocationButKeepsTime()
{
    meshtastic_Position position = makePosition();

    applyPositionPrecision(position, 0);

    TEST_ASSERT_FALSE(position.has_latitude_i);
    TEST_ASSERT_EQUAL_INT32(0, position.latitude_i);
    TEST_ASSERT_FALSE(position.has_longitude_i);
    TEST_ASSERT_EQUAL_INT32(0, position.longitude_i);
    TEST_ASSERT_FALSE(position.has_altitude);
    TEST_ASSERT_EQUAL_INT32(0, position.altitude);
    TEST_ASSERT_EQUAL_UINT32(42, position.time);
    TEST_ASSERT_EQUAL_UINT32(0, position.timestamp);
    TEST_ASSERT_EQUAL_UINT32(0, position.sats_in_view);
    TEST_ASSERT_EQUAL_UINT32(0, position.precision_bits);
}

static void test_applyPositionPrecision_reencodesPositionPacket()
{
    meshtastic_Position position = makePosition();
    meshtastic_MeshPacket packet = meshtastic_MeshPacket_init_default;
    packet.which_payload_variant = meshtastic_MeshPacket_decoded_tag;
    packet.decoded.portnum = meshtastic_PortNum_POSITION_APP;
    packet.decoded.payload.size = pb_encode_to_bytes(packet.decoded.payload.bytes, sizeof(packet.decoded.payload.bytes),
                                                     &meshtastic_Position_msg, &position);

    TEST_ASSERT_TRUE(applyPositionPrecision(packet, 16));

    meshtastic_Position decoded = meshtastic_Position_init_default;
    TEST_ASSERT_TRUE(
        pb_decode_from_bytes(packet.decoded.payload.bytes, packet.decoded.payload.size, &meshtastic_Position_msg, &decoded));
    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x12348000), decoded.latitude_i);
    TEST_ASSERT_EQUAL_INT32(static_cast<int32_t>(0x22348000), decoded.longitude_i);
    TEST_ASSERT_EQUAL_UINT32(16, decoded.precision_bits);
}

static void test_getPositionPrecisionForChannel_explicitPrecisionIsHonored()
{
    meshtastic_Channel channel = makeChannel(meshtastic_Channel_Role_PRIMARY, true, 16);

    TEST_ASSERT_EQUAL_UINT32(16, getPositionPrecisionForChannel(channel));
}

static void test_getPositionPrecisionForChannel_explicitZeroDisablesPrimary()
{
    meshtastic_Channel channel = makeChannel(meshtastic_Channel_Role_PRIMARY, true, 0);

    TEST_ASSERT_EQUAL_UINT32(0, getPositionPrecisionForChannel(channel));
}

static void test_getPositionPrecisionForChannel_primaryWithoutModuleSettingsFailsClosed()
{
    // Regression guard for #10509: precision 32 below must be ignored (no module settings).
    meshtastic_Channel channel = makeChannel(meshtastic_Channel_Role_PRIMARY, false, 32);

    TEST_ASSERT_EQUAL_UINT32(0, getPositionPrecisionForChannel(channel));
}

static void test_getPositionPrecisionForChannel_secondaryWithoutModuleSettingsFailsClosed()
{
    meshtastic_Channel channel = makeChannel(meshtastic_Channel_Role_SECONDARY, false, 32);

    TEST_ASSERT_EQUAL_UINT32(0, getPositionPrecisionForChannel(channel));
}

// End-to-end via the channelIndex overload + live channels singleton, exercising getKey()'s 1-byte->16-byte expansion.
static void test_getPositionPrecisionForChannel_clampsPreciseOnDefaultKeyChannel()
{
    channels.initDefaults(); // channel 0: primary, default key (psk {0x01}) -> publicly decryptable
    uint8_t idx = 0;
    meshtastic_Channel &ch = channels.getByIndex(idx);
    ch.settings.has_module_settings = true;
    ch.settings.module_settings.position_precision = 32; // user requests "Precise" on a public channel

    TEST_ASSERT_EQUAL_UINT32(MAX_POSITION_PRECISION_PUBLIC_KEY, getPositionPrecisionForChannel(idx));
}

static void test_getPositionPrecisionForChannel_keepsPreciseOnStrongKeyChannel()
{
    channels.initDefaults();
    uint8_t idx = 0;
    meshtastic_Channel &ch = channels.getByIndex(idx);
    memset(ch.settings.psk.bytes, 0xAB, 16); // a private 128-bit key, not the defaultpsk family
    ch.settings.psk.size = 16;
    ch.settings.has_module_settings = true;
    ch.settings.module_settings.position_precision = 32;

    TEST_ASSERT_EQUAL_UINT32(32, getPositionPrecisionForChannel(idx));
}

static CryptoKey makeCryptoKey(const uint8_t *bytes, int length)
{
    CryptoKey k;
    memset(k.bytes, 0, sizeof(k.bytes));

    // CryptoKey::length is int8_t and CryptoKey::bytes is 32 bytes; keep the helper consistent and overflow-safe.
    int cappedLen = length;
    if (cappedLen < 0)
        cappedLen = -1;
    else if (cappedLen > static_cast<int>(sizeof(k.bytes)))
        cappedLen = static_cast<int>(sizeof(k.bytes));

    if (cappedLen > 0 && bytes != nullptr) {
        memcpy(k.bytes, bytes, static_cast<size_t>(cappedLen));
    }

    k.length = static_cast<int8_t>(cappedLen);
    return k;
}

static void test_cryptoKeyIsPublic_openKeyIsPublic()
{
    // length 0 == encryption disabled.
    TEST_ASSERT_TRUE(cryptoKeyIsPublic(makeCryptoKey(nullptr, 0)));
}

static void test_cryptoKeyIsPublic_defaultKeyIsPublic()
{
    // The expanded default PSK (the 16-byte defaultpsk) -- the case a key-length check misses.
    TEST_ASSERT_TRUE(cryptoKeyIsPublic(makeCryptoKey(defaultpsk, sizeof(defaultpsk))));
}

static void test_cryptoKeyIsPublic_defaultKeyFamilyVariesLastByte()
{
    // Higher indices (e.g. {0x02}) expand to defaultpsk with only the last byte bumped -- still public.
    uint8_t key[sizeof(defaultpsk)];
    memcpy(key, defaultpsk, sizeof(defaultpsk));
    key[sizeof(defaultpsk) - 1] = static_cast<uint8_t>(key[sizeof(defaultpsk) - 1] + 1);
    TEST_ASSERT_TRUE(cryptoKeyIsPublic(makeCryptoKey(key, sizeof(key))));
}

static void test_cryptoKeyIsPublic_strongKeyIsPrivate()
{
    uint8_t key[16];
    memset(key, 0xAB, sizeof(key)); // not the defaultpsk family
    TEST_ASSERT_FALSE(cryptoKeyIsPublic(makeCryptoKey(key, sizeof(key))));
}

static void test_cryptoKeyIsPublic_aes256KeyIsPrivate()
{
    uint8_t key[32];
    memset(key, 0x11, sizeof(key));
    TEST_ASSERT_FALSE(cryptoKeyIsPublic(makeCryptoKey(key, sizeof(key))));
}

static void test_cryptoKeyIsPublic_invalidKeyIsNotPublic()
{
    // length < 0 == no/invalid key (e.g. a disabled channel); it carries no traffic to leak.
    TEST_ASSERT_FALSE(cryptoKeyIsPublic(makeCryptoKey(nullptr, -1)));
}

void setUp(void) {}

void tearDown(void) {}

extern "C" {
void setup()
{
    initializeTestEnvironment();
    UNITY_BEGIN();
    RUN_TEST(test_applyPositionPrecision_clampsLatLonAndSetsPrecisionBits);
    RUN_TEST(test_applyPositionPrecision_fullPrecisionKeepsLatLon);
    RUN_TEST(test_applyPositionPrecision_zeroScrubsLocationButKeepsTime);
    RUN_TEST(test_applyPositionPrecision_reencodesPositionPacket);
    RUN_TEST(test_getPositionPrecisionForChannel_explicitPrecisionIsHonored);
    RUN_TEST(test_getPositionPrecisionForChannel_explicitZeroDisablesPrimary);
    RUN_TEST(test_getPositionPrecisionForChannel_primaryWithoutModuleSettingsFailsClosed);
    RUN_TEST(test_getPositionPrecisionForChannel_secondaryWithoutModuleSettingsFailsClosed);
    RUN_TEST(test_getPositionPrecisionForChannel_clampsPreciseOnDefaultKeyChannel);
    RUN_TEST(test_getPositionPrecisionForChannel_keepsPreciseOnStrongKeyChannel);
    RUN_TEST(test_cryptoKeyIsPublic_openKeyIsPublic);
    RUN_TEST(test_cryptoKeyIsPublic_defaultKeyIsPublic);
    RUN_TEST(test_cryptoKeyIsPublic_defaultKeyFamilyVariesLastByte);
    RUN_TEST(test_cryptoKeyIsPublic_strongKeyIsPrivate);
    RUN_TEST(test_cryptoKeyIsPublic_aes256KeyIsPrivate);
    RUN_TEST(test_cryptoKeyIsPublic_invalidKeyIsNotPublic);
    exit(UNITY_END());
}

void loop() {}
}