dre: Use local version of wifi-mac-generator

MAC_1_PATH does not exist in the N200, causing a 10-second delay in
generating MAC addresses. By that point, the WLAN driver has already
failed to get a MAC address, thus leaving Wi-Fi broken.

Change-Id: Iab2d34aa9db9e8843108b90b203e82f915c79bda

device.mk

@@ -553,7 +553,7 @@ PRODUCT_PACKAGES += \
     libwpa_client \
     libwifi-hal-ctrl \
     libwifi-hal-qcom \
-    wifi-mac-generator \
+    wifi-mac-generator-dre \
     WifiResCommon \
     wpa_supplicant \
     wpa_supplicant.conf

sepolicy/vendor/file_contexts

@@ -1,6 +1,6 @@
 # Binaries
 /(vendor|system/vendor)/bin/opf-service                u:object_r:opf_exec:s0
-/(vendor|system/vendor)/bin/wifi-mac-generator         u:object_r:wifi-mac-generator_exec:s0
+/(vendor|system/vendor)/bin/wifi-mac-generator-dre     u:object_r:wifi-mac-generator_exec:s0
 
 # Block devices
 /dev/block/platform/soc/4804000\.ufshc/by-name/fw_ufs1_[ab]          u:object_r:vendor_custom_ab_block_device:s0

wifi-mac-generator/Android.bp

@@ -0,0 +1,6 @@
+sh_binary {
+    name: "wifi-mac-generator-dre",
+    init_rc: ["wifi-mac-generator.rc"],
+    src: "wifi-mac-generator.sh",
+    vendor: true,
+}

wifi-mac-generator/wifi-mac-generator.rc

@@ -0,0 +1,9 @@
+service vendor.wifi-mac-generator /vendor/bin/wifi-mac-generator-dre
+    class main
+    user wifi
+    group wifi
+    oneshot
+    disabled
+
+on post-fs-data
+    start vendor.wifi-mac-generator

wifi-mac-generator/wifi-mac-generator.sh

@@ -0,0 +1,43 @@
+#!/vendor/bin/sh
+WLAN_MAC_VENDOR_PREFIX="C0EEFB"
+WLAN_MAC_PERSIST_PATH="/mnt/vendor/persist/wlan_mac.bin"
+
+function wait_for_file() {
+    retries=0
+
+    while [ ! -f "${1}" ]; do
+        retries=$((retries + 1))
+
+        if [ "${retries}" -eq 10 ]; then
+            return 1
+        fi
+
+        sleep 1
+    done
+
+    return 0
+}
+
+if [[ ! -f "${WLAN_MAC_PERSIST_PATH}" ]] || [[ ! -s "${WLAN_MAC_PERSIST_PATH}" ]]; then
+    MAC_0_PATH="/data/vendor/oemnvitems/4678_0"
+
+    if ! wait_for_file "${MAC_0_PATH}"; then
+        MAC_0="${WLAN_MAC_VENDOR_PREFIX}`xxd -l 3 -p /dev/urandom | tr '[:lower:]' '[:upper:]'`"
+    else
+        MAC_0=`xxd -p "${MAC_0_PATH}" | grep -o '..' | tac | tr -d '\n' | tr '[:lower:]' '[:upper:]'`
+    fi
+
+    #MAC_1_PATH="/data/vendor/oemnvitems/4678_1"
+
+    #if ! wait_for_file "${MAC_1_PATH}"; then
+    #    MAC_1="${WLAN_MAC_VENDOR_PREFIX}`xxd -l 3 -p /dev/urandom | tr '[:lower:]' '[:upper:]'`"
+    #else
+    #    MAC_1=`xxd -p "${MAC_1_PATH}" | grep -o '..' | tac | tr -d '\n' | tr '[:lower:]' '[:upper:]'`
+    #fi
+
+    echo "Intf0MacAddress=${MAC_0}" > "${WLAN_MAC_PERSIST_PATH}"
+    echo "Intf1MacAddress=000AF58989FE" >> "${WLAN_MAC_PERSIST_PATH}"
+    echo "Intf2MacAddress=000AF58989FD" >> "${WLAN_MAC_PERSIST_PATH}"
+    echo "Intf3MacAddress=000AF58989FC" >> "${WLAN_MAC_PERSIST_PATH}"
+    echo "END" >> "${WLAN_MAC_PERSIST_PATH}"
+fi