#!/system/bin/sh

# Copyright (C) 2010 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -e

# Default product ID in crash report (used if GOOGLE_CRASH_* is undefined).
BRILLO_PRODUCT=Brillo

# Base directory that contains any crash reporter state files.
CRASH_STATE_DIR="/data/misc/crash_reporter"

# File containing crash_reporter's anonymized guid.
GUID_FILE="${CRASH_STATE_DIR}/guid"

# Crash sender lock in case the sender is already running.
CRASH_SENDER_LOCK="${CRASH_STATE_DIR}/lock/crash_sender"

# Path to file that indicates a crash test is currently running.
CRASH_TEST_IN_PROGRESS_FILE="${CRASH_STATE_DIR}/tmp/crash-test-in-progress"

# Set this to 1 in the environment to allow uploading crash reports
# for unofficial versions.
FORCE_OFFICIAL=${FORCE_OFFICIAL:-0}

# Path to hardware class description.
HWCLASS_PATH="/sys/devices/platform/chromeos_acpi/HWID"

# Path to file that indicates this is a developer image.
LEAVE_CORE_FILE="${CRASH_STATE_DIR}/.leave_core"

# Path to list_proxies.
LIST_PROXIES="list_proxies"

# Maximum crashes to send per day.
MAX_CRASH_RATE=${MAX_CRASH_RATE:-32}

# File whose existence mocks crash sending.  If empty we pretend the
# crash sending was successful, otherwise unsuccessful.
MOCK_CRASH_SENDING="${CRASH_STATE_DIR}/tmp/mock-crash-sending"

# Set this to 1 in the environment to pretend to have booted in developer
# mode.  This is used by autotests.
MOCK_DEVELOPER_MODE=${MOCK_DEVELOPER_MODE:-0}

# Ignore PAUSE_CRASH_SENDING file if set.
OVERRIDE_PAUSE_SENDING=${OVERRIDE_PAUSE_SENDING:-0}

# File whose existence causes crash sending to be delayed (for testing).
# Must be stateful to enable testing kernel crashes.
PAUSE_CRASH_SENDING="${CRASH_STATE_DIR}/lock/crash_sender_paused"

# Path to a directory of restricted certificates which includes
# a certificate for the crash server.
RESTRICTED_CERTIFICATES_PATH="/system/etc/security/cacerts"

# File whose existence implies we're running and not to start again.
RUN_FILE="${CRASH_STATE_DIR}/run/crash_sender.pid"

# Maximum time to sleep between sends.
SECONDS_SEND_SPREAD=${SECONDS_SEND_SPREAD:-600}

# Set this to 1 to allow uploading of device coredumps.
DEVCOREDUMP_UPLOAD_FLAG_FILE="${CRASH_STATE_DIR}/device_coredump_upload_allowed"

# The weave configuration file.
WEAVE_CONF_FILE="/etc/weaved/weaved.conf"

# The syslog tag for all logging we emit.
TAG="$(basename $0)[$$]"

# Directory to store timestamp files indicating the uploads in the past 24
# hours.
TIMESTAMPS_DIR="${CRASH_STATE_DIR}/crash_sender"

# Temp directory for this process.
TMP_DIR=""

# Crash report log file.
CRASH_LOG="${CRASH_STATE_DIR}/log/uploads.log"

lecho() {
  log -t "${TAG}" "$@"
}

# Returns true if mock is enabled.
is_mock() {
  [ -f "${MOCK_CRASH_SENDING}" ] && return 0
  return 1
}

is_mock_successful() {
  local mock_in=$(cat "${MOCK_CRASH_SENDING}")
  [ "${mock_in}" = "" ] && return 0  # empty file means success
  return 1
}

cleanup() {
  if [ -n "${TMP_DIR}" ]; then
    rm -rf "${TMP_DIR}"
  fi
  rm -f "${RUN_FILE}"
  if [ -n "${CRASH_SENDER_LOCK}" ]; then
    rm -rf "${CRASH_SENDER_LOCK}"
  fi
  crash_done
}

crash_done() {
  if is_mock; then
    # For testing purposes, emit a message to log so that we
    # know when the test has received all the messages from this run.
    lecho "crash_sender done."
  fi
}

is_official_image() {
  [ ${FORCE_OFFICIAL} -ne 0 ] && return 0
  getprop ro.product.description | grep -q Official
}

# Returns 0 if the a crash test is currently running.  NOTE: Mirrors
# crash_collector.cc:CrashCollector::IsCrashTestInProgress().
is_crash_test_in_progress() {
  [ -f "${CRASH_TEST_IN_PROGRESS_FILE}" ] && return 0
  return 1
}

# Returns 0 if we should consider ourselves to be running on a developer
# image.  NOTE: Mirrors crash_collector.cc:CrashCollector::IsDeveloperImage().
is_developer_image() {
  # If we're testing crash reporter itself, we don't want to special-case
  # for developer images.
  is_crash_test_in_progress && return 1
  [ -f "${LEAVE_CORE_FILE}" ] && return 0
  return 1
}

# Returns 0 if we should consider ourselves to be running on a test image.
is_test_image() {
  # If we're testing crash reporter itself, we don't want to special-case
  # for test images.
  is_crash_test_in_progress && return 1
  case $(get_channel) in
  test*) return 0;;
  esac
  return 1
}

# Returns 0 if the machine booted up in developer mode.
is_developer_mode() {
  [ ${MOCK_DEVELOPER_MODE} -ne 0 ] && return 0
  # If we're testing crash reporter itself, we don't want to special-case
  # for developer mode.
  is_crash_test_in_progress && return 1
  if [ "$(getprop ro.build.type)" = "eng" ]; then
    return 0
  else
    return 1
  fi
}

# Return 0 if the uploading of device coredumps is allowed.
is_device_coredump_upload_allowed() {
  [ -f "${DEVCOREDUMP_UPLOAD_FLAG_FILE}" ] && return 0
  return 1
}

# Generate a uniform random number in 0..max-1.
# POSIX arithmetic expansion requires support of at least signed long integers.
# On 32-bit systems, that may mean 32-bit signed integers, in which case the
# 32-bit random number read from /dev/urandom may be interpreted as negative
# when used inside an arithmetic expansion (since the high bit might be set).
# mksh at least is known to behave this way.
# For this case, simply take the absolute value, which will still give a
# roughly uniform random distribution for the modulo (as we are merely ignoring
# the high/sign bit).
# See corresponding Arithmetic Expansion and Arithmetic Expression sections:
# POSIX: http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_04
# mksh: http://linux.die.net/man/1/mksh
generate_uniform_random() {
  local max=$1
  local random="$(od -An -N4 -tu /dev/urandom)"
  echo $(((random < 0 ? -random : random) % max))
}

# Check if sending a crash now does not exceed the maximum 24hr rate and
# commit to doing so, if not.
check_rate() {
  mkdir -p ${TIMESTAMPS_DIR}
  # Only consider minidumps written in the past 24 hours by removing all older.
  find "${TIMESTAMPS_DIR}" -mindepth 1 -mtime +1 \
      -exec rm -- '{}' ';'
  local sends_in_24hrs=$(echo "${TIMESTAMPS_DIR}"/* | wc -w)
  lecho "Current send rate: ${sends_in_24hrs}sends/24hrs"
  if [ ${sends_in_24hrs} -ge ${MAX_CRASH_RATE} ]; then
    lecho "Cannot send more crashes:"
    lecho "  current ${sends_in_24hrs}send/24hrs >= " \
          "max ${MAX_CRASH_RATE}send/24hrs"
    return 1
  fi
  mktemp "${TIMESTAMPS_DIR}"/XXXXXX > /dev/null
  return 0
}

# Gets the base part of a crash report file, such as name.01234.5678.9012 from
# name.01234.5678.9012.meta or name.01234.5678.9012.log.tar.xz.  We make sure
# "name" is sanitized in CrashCollector::Sanitize to not include any periods.
get_base() {
  echo "$1" | cut -d. -f-4
}

get_extension() {
  local extension="${1##*.}"
  local filename="${1%.*}"
  # For gzipped file, we ignore .gz and get the real extension
  if [ "${extension}" = "gz" ]; then
    echo "${filename##*.}"
  else
    echo "${extension}"
  fi
}

# Return which kind of report the given metadata file relates to
get_kind() {
  local payload="$(get_key_value "$1" "payload")"
  if [ ! -r "${payload}" ]; then
    lecho "Missing payload: ${payload}"
    echo "undefined"
    return
  fi
  local kind="$(get_extension "${payload}")"
  if [ "${kind}" = "dmp" ]; then
    echo "minidump"
    return
  fi
  echo "${kind}"
}

get_key_value() {
  local file="$1" key="$2" value

  if [ -f "${file}" ]; then
    # Return the first entry.  There shouldn't be more than one anyways.
    # Substr at length($1) + 2 skips past the key and following = sign (awk
    # uses 1-based indexes), but preserves embedded = characters.
    value=$(sed -n "/^${key}[[:space:]]*=/{s:^[^=]*=::p;q}" "${file}")
  fi

  echo "${value:-undefined}"
}

get_keys() {
  local file="$1" regex="$2"

  cut -d '=' -f1 "${file}" | grep --color=never "${regex}"
}

# Return the channel name (sans "-channel" suffix).
get_channel() {
  getprop ro.product.channel | sed 's:-channel$::'
}

# Return the hardware class or "undefined".
get_hardware_class() {
  if [ -r "${HWCLASS_PATH}" ]; then
    cat "${HWCLASS_PATH}"
  else
    echo "undefined"
  fi
}

send_crash() {
  local meta_path="$1"
  local report_payload="$(get_key_value "${meta_path}" "payload")"
  local kind="$(get_kind "${meta_path}")"
  local exec_name="$(get_key_value "${meta_path}" "exec_name")"
  local url="$(getprop crash_reporter.server)"
  local brillo_version="$(get_key_value "${meta_path}" "ver")"
  local hwclass="$(get_hardware_class)"
  local write_payload_size="$(get_key_value "${meta_path}" "payload_size")"
  local log="$(get_key_value "${meta_path}" "log")"
  local sig="$(get_key_value "${meta_path}" "sig")"
  local send_payload_size="$(stat -c "%s" "${report_payload}" 2>/dev/null)"
  local product="$(get_key_value "${meta_path}" "upload_var_prod")"
  local version="$(get_key_value "${meta_path}" "upload_var_ver")"
  local upload_prefix="$(get_key_value "${meta_path}" "upload_prefix")"
  local guid
  local model_manifest_id="$(get_key_value "${WEAVE_CONF_FILE}" "model_id")"

  # If crash_reporter.server is not set return with an error.
  if [ -z "${url}" ]; then
    lecho "Configuration error: crash_reporter.server not set."
    return 1
  fi

  set -- \
    -F "write_payload_size=${write_payload_size}" \
    -F "send_payload_size=${send_payload_size}"
  if [ "${sig}" != "undefined" ]; then
    set -- "$@" \
      -F "sig=${sig}" \
      -F "sig2=${sig}"
  fi
  if [ -r "${report_payload}" ]; then
    set -- "$@" \
      -F "upload_file_${kind}=@${report_payload}"
  fi
  if [ "${log}" != "undefined" -a -r "${log}" ]; then
    set -- "$@" \
      -F "log=@${log}"
  fi

  if [ "${upload_prefix}" = "undefined" ]; then
    upload_prefix=""
  fi

  # Grab any variable that begins with upload_.
  local v
  for k in $(get_keys "${meta_path}" "^upload_"); do
    v="$(get_key_value "${meta_path}" "${k}")"
    case ${k} in
      # Product & version are handled separately.
      upload_var_prod) ;;
      upload_var_ver) ;;
      upload_var_*)
        set -- "$@" -F "${upload_prefix}${k#upload_var_}=${v}"
        ;;
      upload_file_*)
        if [ -r "${v}" ]; then
          set -- "$@" -F "${upload_prefix}${k#upload_file_}=@${v}"
        fi
        ;;
    esac
  done

  # When uploading Chrome reports we need to report the right product and
  # version. If the meta file does not specify it, use GOOGLE_CRASH_ID
  # as the product and GOOGLE_CRASH_VERSION_ID as the version.
  if [ "${product}" = "undefined" ]; then
    product="$(get_key_value /etc/os-release 'GOOGLE_CRASH_ID')"
  fi
  if [ "${version}" = "undefined" ]; then
    version="$(get_key_value /etc/os-release 'GOOGLE_CRASH_VERSION_ID')"
  fi

  # If GOOGLE_CRASH_* is undefined, we look for ID and VERSION_ID in
  # /etc/os-release.
  if [ "${product}" = "undefined" ]; then
    product="$(get_key_value /etc/os-release 'ID')"
  fi
  if [ "${version}" = "undefined" ]; then
    version="$(get_key_value /etc/os-release 'VERSION_ID')"
  fi

  # If ID or VERSION_ID is undefined, we use the default product name
  # and CHROMEOS_RELEASE_VERSION from /etc/lsb-release.
  if [ "${product}" = "undefined" ]; then
    product="${BRILLO_PRODUCT}"
  fi
  if [ "${version}" = "undefined" ]; then
    version="${brillo_version}"
  fi

  local image_type
  if is_test_image; then
    image_type="test"
  elif is_developer_image; then
    image_type="dev"
  elif [ ${FORCE_OFFICIAL} -ne 0 ]; then
    image_type="force-official"
  elif is_mock && ! is_mock_successful; then
    image_type="mock-fail"
  fi

  local boot_mode
  if is_developer_mode; then
    boot_mode="dev"
  fi

  # Need to strip dashes ourselves as Chrome preserves it in the file
  # nowadays.  This is also what the Chrome breakpad client does.
  guid=$(tr -d '-' < "${GUID_FILE}")

  local error_type="$(get_key_value "${meta_path}" "error_type")"
  [ "${error_type}" = "undefined" ] && error_type=

  lecho "Sending crash:"
  if [ "${product}" != "${BRILLO_PRODUCT}" ]; then
    lecho "  Sending crash report on behalf of ${product}"
  fi
  lecho "  Metadata: ${meta_path} (${kind})"
  lecho "  Payload: ${report_payload}"
  lecho "  Version: ${version}"
  [ -n "${image_type}" ] && lecho "  Image type: ${image_type}"
  [ -n "${boot_mode}" ] && lecho "  Boot mode: ${boot_mode}"
  if is_mock; then
    lecho "  Product: ${product}"
    lecho "  URL: ${url}"
    lecho "  HWClass: ${hwclass}"
    lecho "  write_payload_size: ${write_payload_size}"
    lecho "  send_payload_size: ${send_payload_size}"
    if [ "${log}" != "undefined" ]; then
      lecho "  log: @${log}"
    fi
    if [ "${sig}" != "undefined" ]; then
      lecho "  sig: ${sig}"
    fi
  fi
  lecho "  Exec name: ${exec_name}"
  [ -n "${error_type}" ] && lecho "  Error type: ${error_type}"
  if is_mock; then
    if ! is_mock_successful; then
      lecho "Mocking unsuccessful send"
      return 1
    fi
    lecho "Mocking successful send"
    return 0
  fi

  # Read in the first proxy, if any, for a given URL.  NOTE: The
  # double-quotes are necessary due to a bug in dash with the "local"
  # builtin command and values that have spaces in them (see
  # "https://bugs.launchpad.net/ubuntu/+source/dash/+bug/139097").
  if [ -f "${LIST_PROXIES}" ]; then
    local proxy ret
    proxy=$("${LIST_PROXIES}" --quiet "${url}")
    ret=$?
    if [ ${ret} -ne 0 ]; then
      proxy=''
      lecho -psyslog.warn \
        "Listing proxies failed with exit code ${ret}"
    else
      proxy=$(echo "${proxy}" | head -1)
    fi
  fi
  # if a direct connection should be used, unset the proxy variable.
  [ "${proxy}" = "direct://" ] && proxy=
  local report_id="${TMP_DIR}/report_id"
  local curl_stderr="${TMP_DIR}/curl_stderr"

  set +e
  curl "${url}" -v ${proxy:+--proxy "$proxy"} \
    --capath "${RESTRICTED_CERTIFICATES_PATH}" --ciphers HIGH \
    -F "prod=${product}" \
    -F "ver=${version}" \
    -F "hwclass=${hwclass}" \
    -F "exec_name=${exec_name}" \
    -F "model_manifest_id=${model_manifest_id}" \
    ${image_type:+-F "image_type=${image_type}"} \
    ${boot_mode:+-F "boot_mode=${boot_mode}"} \
    ${error_type:+-F "error_type=${error_type}"} \
    -F "guid=${guid}" \
    -o "${report_id}" \
    "$@" \
    2>"${curl_stderr}"
  curl_result=$?
  set -e

  if [ ${curl_result} -eq 0 ]; then
    local id="$(cat "${report_id}")"
    local product_name
    local timestamp="$(date +%s)"
    case ${product} in
    Chrome_ChromeOS)
      if is_official_image; then
        product_name="Chrome"
      else
        product_name="Chromium"
      fi
      ;;
    *)
      product_name="Brillo"
      ;;
    esac
    printf '%s,%s,%s\n' \
      "${timestamp}" "${id}" "${product_name}" >> "${CRASH_LOG}"
    lecho "Crash report receipt ID ${id}"
  else
    lecho "Crash sending failed with exit code ${curl_result}: " \
      "$(cat "${curl_stderr}")"
  fi

  rm -f "${report_id}"

  return ${curl_result}
}

# *.meta files always end with done=1 so we can tell if they are complete.
is_complete_metadata() {
  grep -q "done=1" "$1"
}

# Remove the given report path.
remove_report() {
  local base="${1%.*}"
  rm -f -- "${base}".*
}

# Send all crashes from the given directory.  This applies even when we're on a
# 3G connection (see crosbug.com/3304 for discussion).
send_crashes() {
  local dir="$1"
  lecho "Sending crashes for ${dir}"

  if [ ! -d "${dir}" ]; then
    return
  fi

  # Consider any old files which still have no corresponding meta file
  # as orphaned, and remove them.
  for old_file in $(find "${dir}" -mindepth 1 \
                    -mtime +1 -type f); do
    if [ ! -e "$(get_base "${old_file}").meta" ]; then
      lecho "Removing old orphaned file: ${old_file}."
      rm -f -- "${old_file}"
    fi
  done

  # Look through all metadata (*.meta) files, oldest first.  That way, the rate
  # limit does not stall old crashes if there's a high amount of new crashes
  # coming in.
  # For each crash report, first evaluate conditions that might lead to its
  # removal to honor user choice and to free disk space as soon as possible,
  # then decide whether it should be sent right now or kept for later sending.
  for meta_path in $(ls -1tr "${dir}"/*.meta 2>/dev/null); do
    lecho "Considering metadata ${meta_path}."

    local kind=$(get_kind "${meta_path}")
    if [ "${kind}" != "minidump" ] && \
       [ "${kind}" != "kcrash" ] && \
       [ "${kind}" != "log" ] &&
       [ "${kind}" != "devcore" ]; then
      lecho "Unknown report kind ${kind}.  Removing report."
      remove_report "${meta_path}"
      continue
    fi

    if ! is_complete_metadata "${meta_path}"; then
      # This report is incomplete, so if it's old, just remove it.
      local old_meta=$(find "${dir}" -mindepth 1 -name \
        $(basename "${meta_path}") -mtime +1 -type f)
      if [ -n "${old_meta}" ]; then
        lecho "Removing old incomplete metadata."
        remove_report "${meta_path}"
      else
        lecho "Ignoring recent incomplete metadata."
      fi
      continue
    fi

    # Ignore device coredump if device coredump uploading is not allowed.
    if [ "${kind}" = "devcore" ] && ! is_device_coredump_upload_allowed; then
      lecho "Ignoring device coredump. Device coredump upload not allowed."
      continue
    fi

    if ! is_mock && ! is_official_image; then
      lecho "Not an official OS version.  Removing crash."
      remove_report "${meta_path}"
      continue
    fi

    # Remove existing crashes in case user consent has not (yet) been given or
    # has been revoked.  This must come after the guest mode check because
    # metrics_client always returns "not consented" in guest mode.
    if ! metrics_client -c; then
      lecho "Crash reporting is disabled.  Removing crash."
      remove_report "${meta_path}"
      continue
    fi

    # Skip report if the upload rate is exceeded.  (Don't exit right now because
    # subsequent reports may be candidates for deletion.)
    if ! check_rate; then
      lecho "Sending ${meta_path} would exceed rate.  Leaving for later."
      continue
    fi

    # The .meta file should be written *after* all to-be-uploaded files that it
    # references.  Nevertheless, as a safeguard, a hold-off time of thirty
    # seconds after writing the .meta file is ensured.  Also, sending of crash
    # reports is spread out randomly by up to SECONDS_SEND_SPREAD.  Thus, for
    # the sleep call the greater of the two delays is used.
    local now=$(date +%s)
    local holdoff_time=$(($(stat -c "%Y" "${meta_path}") + 30 - ${now}))
    local spread_time=$(generate_uniform_random "${SECONDS_SEND_SPREAD}")
    local sleep_time
    if [ ${spread_time} -gt ${holdoff_time} ]; then
      sleep_time="${spread_time}"
    else
      sleep_time="${holdoff_time}"
    fi
    lecho "Scheduled to send in ${sleep_time}s."
    if ! is_mock; then
      if ! sleep "${sleep_time}"; then
          lecho "Sleep failed"
          return 1
      fi
    fi

    # Try to upload.
    if ! send_crash "${meta_path}"; then
      lecho "Problem sending ${meta_path}, not removing."
      continue
    fi

    # Send was successful, now remove.
    lecho "Successfully sent crash ${meta_path} and removing."
    remove_report "${meta_path}"
  done
}

usage() {
  cat <<EOF
Usage: crash_sender [options]

Options:
 -e <var>=<val>     Set env |var| to |val| (only some vars)
EOF
  exit ${1:-1}
}

parseargs() {
  # Parse the command line arguments.
  while [ $# -gt 0 ]; do
    case $1 in
    -e)
      shift
      case $1 in
      FORCE_OFFICIAL=*|\
      MAX_CRASH_RATE=*|\
      MOCK_DEVELOPER_MODE=*|\
      OVERRIDE_PAUSE_SENDING=*|\
      SECONDS_SEND_SPREAD=*)
        export "$1"
        ;;
      *)
        lecho "Unknown var passed to -e: $1"
        exit 1
        ;;
      esac
      ;;
    -h)
      usage 0
      ;;
    *)
      lecho "Unknown options: $*"
      exit 1
      ;;
    esac
    shift
  done
}

main() {
  parseargs "$@"

  if [ -e "${PAUSE_CRASH_SENDING}" ] && \
     [ ${OVERRIDE_PAUSE_SENDING} -eq 0 ]; then
    lecho "Exiting early due to ${PAUSE_CRASH_SENDING}."
    exit 1
  fi

  if is_test_image; then
    lecho "Exiting early due to test image."
    exit 1
  fi

  # We don't perform checks on this because we have a master lock with the
  # CRASH_SENDER_LOCK file.  This pid file is for the system to keep track
  # (like with autotests) that we're still running.
  echo $$ > "${RUN_FILE}"

  for dependency in "${RESTRICTED_CERTIFICATES_PATH}"; do
    if [ ! -x "${dependency}" ]; then
      lecho "Fatal: Crash sending disabled: ${dependency} not found."
      exit 1
    fi
  done

  TMP_DIR="$(mktemp -d "${CRASH_STATE_DIR}/tmp/crash_sender.XXXXXX")"

  # Send system-wide crashes
  send_crashes "${CRASH_STATE_DIR}/crash"
}

trap cleanup EXIT INT TERM

#TODO(http://b/23937249): Change the locking logic back to using flock.
if ! mkdir "${CRASH_SENDER_LOCK}" 2>/dev/null; then
  lecho "Already running; quitting."
  crash_done
  exit 1
fi
main "$@"