backtrace Back-route test

#!/usr/bin/env bash
# Served by xyz.sh/backtrace
# Human-readable page: https://xyz.sh/backtrace
# This file is the common library followed by the script body.
# No telemetry is added by xyz.sh.
# =============================================================================
# xyz.sh common library
# Shared helpers for every script served by xyz.sh.
#
# Promises:
#   - No telemetry, analytics, or background "phone-home" calls
#   - No hidden installs or config changes beyond what the script announces
#   - Official upstream URLs are printed before any remote code is executed
#   - Destructive or system-changing steps ask for confirmation (or YES=1 / -y)
# =============================================================================

if [[ -n "${XYZ_COMMON_LOADED:-}" ]]; then
  # When sourced a second time, return. When executed as a file, return fails.
  # shellcheck disable=SC2317
  return 0 2>/dev/null || true
fi
# shellcheck disable=SC2034
XYZ_COMMON_LOADED=1

set -euo pipefail

XYZ_VERSION="1.3.0"
XYZ_BASE="${XYZ_BASE:-https://xyz.sh}"
XYZ_NAME="${XYZ_NAME:-unknown}"

# --- language ---------------------------------------------------------------
# Override with XYZ_LANG=zh or XYZ_LANG=en.
if [[ -z "${XYZ_LANG:-}" ]]; then
  case "${LC_ALL:-${LC_MESSAGES:-${LANG:-}}}" in
    zh*|ZH*|cmn*|CMN*) XYZ_LANG="zh" ;;
    *) XYZ_LANG="en" ;;
  esac
fi

xyz_t() {
  # xyz_t "English text" "中文文本"
  if [[ "${XYZ_LANG}" == "zh" ]]; then
    printf '%s' "${2:-$1}"
  else
    printf '%s' "$1"
  fi
}

# --- colors (TTY only) ------------------------------------------------------
# XYZ_COLOR=always|never|auto (default auto: TTY and no NO_COLOR); --no-color.
_xyz_color=0
case "${XYZ_COLOR:-auto}" in
  always) _xyz_color=1 ;;
  never) _xyz_color=0 ;;
  *) [[ -t 1 && -z "${NO_COLOR:-}" ]] && _xyz_color=1 ;;
esac
[[ "${XYZ_NO_COLOR:-0}" == "1" ]] && _xyz_color=0
if [[ "${_xyz_color}" == "1" ]]; then
  XYZ_C_RESET=$'\033[0m'
  XYZ_C_BOLD=$'\033[1m'
  XYZ_C_DIM=$'\033[2m'
  XYZ_C_RED=$'\033[31m'
  XYZ_C_GREEN=$'\033[32m'
  XYZ_C_YELLOW=$'\033[33m'
  XYZ_C_CYAN=$'\033[36m'
else
  XYZ_C_RESET=""
  XYZ_C_BOLD=""
  XYZ_C_DIM=""
  XYZ_C_RED=""
  XYZ_C_GREEN=""
  XYZ_C_YELLOW=""
  XYZ_C_CYAN=""
fi

xyz_info()  { printf '%s[INFO]%s %s\n'  "${XYZ_C_GREEN}"  "${XYZ_C_RESET}" "$*"; }
xyz_warn()  { printf '%s[WARN]%s %s\n'  "${XYZ_C_YELLOW}" "${XYZ_C_RESET}" "$*" >&2; }
xyz_error() { printf '%s[ERROR]%s %s\n' "${XYZ_C_RED}"    "${XYZ_C_RESET}" "$*" >&2; }
xyz_step()  { printf '%s==>%s %s\n'     "${XYZ_C_CYAN}"   "${XYZ_C_RESET}" "$*"; }

# --- args / init ------------------------------------------------------------
XYZ_ARGS=()
XYZ_YES=0
XYZ_DRY_RUN=0

xyz_parse_global_args() {
  local filtered=()
  local arg
  for arg in "$@"; do
    case "${arg}" in
      -y|--yes)
        XYZ_YES=1
        ;;
      --lang=zh|zh)
        XYZ_LANG="zh"
        ;;
      --lang=en|en)
        XYZ_LANG="en"
        ;;
      --dry-run)
        XYZ_DRY_RUN=1
        ;;
      --no-color)
        XYZ_NO_COLOR=1
        XYZ_C_RESET=""; XYZ_C_BOLD=""; XYZ_C_DIM=""; XYZ_C_RED=""
        XYZ_C_GREEN=""; XYZ_C_YELLOW=""; XYZ_C_CYAN=""
        ;;
      --help|-h)
        XYZ_HELP=1
        filtered+=("${arg}")
        ;;
      *)
        filtered+=("${arg}")
        ;;
    esac
  done
  XYZ_ARGS=("${filtered[@]+"${filtered[@]}"}")
  if [[ "${YES:-}" =~ ^(1|yes|true|YES)$ || "${XYZ_ASSUME_YES:-}" == "1" ]]; then
    XYZ_YES=1
  fi
  # Exported so individual scripts can read flags set here.
  export XYZ_ARGS XYZ_YES XYZ_LANG XYZ_HELP="${XYZ_HELP:-}" XYZ_DRY_RUN="${XYZ_DRY_RUN:-0}"
  export XYZ_NO_COLOR="${XYZ_NO_COLOR:-0}"
  if declare -F xyz_ui_init >/dev/null; then xyz_ui_init; fi
}

xyz_banner() {
  local title="${XYZ_TITLE:-$XYZ_NAME}"
  printf '\n%s%sxyz.sh/%s%s  v%s\n' "${XYZ_C_BOLD}" "${XYZ_C_CYAN}" "${XYZ_NAME}" "${XYZ_C_RESET}" "${XYZ_VERSION}"
  printf '%s\n' "${XYZ_C_DIM}----------------------------------------${XYZ_C_RESET}"
  printf '  %s: %s/%s\n' "$(xyz_t "Page" "页面")" "${XYZ_BASE}" "${XYZ_NAME}"
  printf '  %s: %s/%s.sh\n' "$(xyz_t "Raw" "源码")" "${XYZ_BASE}" "${XYZ_NAME}"
  if [[ -n "${XYZ_UPSTREAM:-}" ]]; then
    printf '  %s: %s\n' "$(xyz_t "Upstream" "上游来源")" "${XYZ_UPSTREAM}"
  fi
  printf '  %s\n' "$(xyz_t "No telemetry, no hidden actions." "无遥测、无隐藏操作。")"
  printf '%s\n\n' "${XYZ_C_DIM}----------------------------------------${XYZ_C_RESET}"
  if [[ -n "${title}" && "${title}" != "${XYZ_NAME}" ]]; then
    xyz_step "${title}"
  fi
}

xyz_init() {
  xyz_parse_global_args "$@"
  xyz_detect_os
  xyz_banner
}

# --- root / OS --------------------------------------------------------------
xyz_is_root() {
  [[ "${EUID:-$(id -u)}" -eq 0 ]]
}

xyz_require_root() {
  if ! xyz_is_root; then
    xyz_error "$(xyz_t \
      "This script must be run as root. Try: sudo bash" \
      "请使用 root 运行。可尝试：sudo bash")"
    exit 1
  fi
}

xyz_prefer_root() {
  if ! xyz_is_root; then
    xyz_warn "$(xyz_t \
      "Not running as root; some information or tests may be limited." \
      "当前不是 root，部分信息或测试可能不完整。")"
  fi
}

XYZ_OS_ID=""
XYZ_OS_LIKE=""
XYZ_OS_VERSION=""
XYZ_OS_FAMILY=""   # debian | rhel | unknown
XYZ_OS_PRETTY=""

xyz_detect_os() {
  XYZ_OS_ID=""
  XYZ_OS_LIKE=""
  XYZ_OS_VERSION=""
  XYZ_OS_FAMILY="unknown"
  XYZ_OS_PRETTY="unknown"
  if [[ -r /etc/os-release ]]; then
    # shellcheck disable=SC1091
    . /etc/os-release
    XYZ_OS_ID="${ID:-}"
    XYZ_OS_LIKE="${ID_LIKE:-}"
    XYZ_OS_VERSION="${VERSION_ID:-}"
    XYZ_OS_PRETTY="${PRETTY_NAME:-$XYZ_OS_ID}"
    export XYZ_OS_ID XYZ_OS_LIKE XYZ_OS_VERSION XYZ_OS_FAMILY XYZ_OS_PRETTY
  fi
  case "${XYZ_OS_ID}" in
    debian|ubuntu)
      XYZ_OS_FAMILY="debian"
      ;;
    centos|rhel|rocky|almalinux|alma|fedora)
      XYZ_OS_FAMILY="rhel"
      ;;
    *)
      case " ${XYZ_OS_ID} ${XYZ_OS_LIKE} " in
        *debian*|*ubuntu*) XYZ_OS_FAMILY="debian" ;;
        *rhel*|*centos*|*fedora*|*rocky*|*alma*) XYZ_OS_FAMILY="rhel" ;;
        *) : ;;
      esac
      ;;
  esac
}

xyz_os_supported() {
  case "${XYZ_OS_ID}" in
    debian|ubuntu|centos|rocky|almalinux) return 0 ;;
    *) : ;;
  esac
  case " ${XYZ_OS_LIKE} " in
    *debian*|*ubuntu*|*rhel*|*centos*|*rocky*|*alma*) return 0 ;;
    *) : ;;
  esac
  return 1
}

xyz_require_supported_os() {
  xyz_detect_os
  if ! xyz_os_supported; then
    xyz_warn "$(xyz_t \
      "Unrecognized distribution: ${XYZ_OS_ID:-unknown} (${XYZ_OS_PRETTY}). Officially supported: Debian, Ubuntu, CentOS, Rocky, AlmaLinux." \
      "未能识别的发行版：${XYZ_OS_ID:-unknown}（${XYZ_OS_PRETTY}）。官方支持：Debian、Ubuntu、CentOS、Rocky、AlmaLinux。")"
    if ! xyz_confirm "$(xyz_t "Continue anyway?" "仍然继续？")"; then
      exit 1
    fi
  else
    xyz_info "$(xyz_t "Detected OS:" "检测到系统：") ${XYZ_OS_PRETTY} (${XYZ_OS_FAMILY})"
  fi
}

# --- packages / commands ----------------------------------------------------
xyz_need_cmd() {
  command -v "$1" >/dev/null 2>&1
}

xyz_pkg_install() {
  xyz_detect_os
  if (( $# == 0 )); then
    return 0
  fi
  case "${XYZ_OS_FAMILY}" in
    debian)
      export DEBIAN_FRONTEND=noninteractive
      apt-get update -y || xyz_warn "$(xyz_t "apt-get update reported errors (a repository may be unreachable); trying to install anyway." "apt-get update 报错（可能有软件源无法访问），仍尝试安装。")"
      apt-get install -y --no-install-recommends "$@"
      ;;
    rhel)
      if xyz_need_cmd dnf; then
        dnf install -y "$@"
      elif xyz_need_cmd yum; then
        yum install -y "$@"
      else
        xyz_error "$(xyz_t "Neither dnf nor yum is available." "找不到 dnf 或 yum。")"
        exit 1
      fi
      ;;
    *)
      xyz_error "$(xyz_t "Cannot install packages on this OS automatically." "无法在此系统上自动安装软件包。")"
      exit 1
      ;;
  esac
}

xyz_ensure_cmds() {
  local pkg
  local missing=()
  for pkg in "$@"; do
    if ! xyz_need_cmd "${pkg}"; then
      missing+=("${pkg}")
    fi
  done
  if ((${#missing[@]} > 0)); then
    xyz_info "$(xyz_t "Installing missing commands:" "正在安装缺失命令：") ${missing[*]}"
    xyz_pkg_install "${missing[@]}"
  fi
}

# --- confirmation (safe with curl | bash) -----------------------------------
# A readable /dev/tty node is not enough: in containers or curl|bash without a
# controlling terminal, open() fails with ENXIO ("No such device or address").
# [[ -r /dev/tty ]] is true in that case and must not be used as the check.
xyz_open_tty() {
  # Opens /dev/tty into XYZ_TTY_FD if it is a real terminal. Caller must close.
  local fd
  XYZ_TTY_FD=""
  # Brace group so a failed open cannot leak "No such device or address".
  if { exec {fd}<>/dev/tty; } 2>/dev/null && [[ -t "${fd}" ]]; then
    XYZ_TTY_FD="${fd}"
    return 0
  fi
  if [[ -n "${fd:-}" ]]; then
    exec {fd}>&- 2>/dev/null || true
  fi
  return 1
}

xyz_close_tty() {
  if [[ -n "${XYZ_TTY_FD:-}" ]]; then
    exec {XYZ_TTY_FD}>&- 2>/dev/null || true
    XYZ_TTY_FD=""
  fi
}

xyz_confirm() {
  local prompt="$1"
  if [[ "${XYZ_YES}" == "1" ]]; then
    xyz_info "$(xyz_t "Auto-confirmed (-y / YES=1):" "已自动确认（-y / YES=1）：") ${prompt}"
    return 0
  fi
  local reply=""
  if xyz_open_tty; then
    printf '%s [y/N] ' "${prompt}" >&"${XYZ_TTY_FD}"
    # shellcheck disable=SC2162
    read -r reply <&"${XYZ_TTY_FD}" || true
    xyz_close_tty
  else
    xyz_warn "$(xyz_t \
      "No TTY available for confirmation. Re-run with -y or YES=1 if you accept." \
      "没有可用的终端来确认。若你已了解并同意，请加 -y 或 YES=1 重试。")"
    return 1
  fi
  case "${reply}" in
    y|Y|yes|YES|Yes) return 0 ;;
    *) return 1 ;;
  esac
}

# --- download helpers -------------------------------------------------------
# Create the temp dir in the main shell. xyz_tmpdir is usually called inside
# $(...), a subshell, so creating it (and its EXIT trap) there would delete the
# directory as soon as the subshell returned.
xyz_init_tmpdir() {
  if [[ -z "${XYZ_TMPDIR:-}" || ! -d "${XYZ_TMPDIR}" ]]; then
    XYZ_TMPDIR="$(mktemp -d "${TMPDIR:-/tmp}/xyzsh.XXXXXX")"
    # shellcheck disable=SC2064
    trap "rm -rf '${XYZ_TMPDIR}'" EXIT
  fi
}

xyz_tmpdir() {
  if [[ -z "${XYZ_TMPDIR:-}" || ! -d "${XYZ_TMPDIR}" ]]; then
    xyz_error "internal: temp dir not initialised"
    exit 1
  fi
  printf '%s' "${XYZ_TMPDIR}"
}

xyz_fetch() {
  # xyz_fetch URL DEST
  local url="$1"
  local dest="$2"
  xyz_info "$(xyz_t "Downloading" "正在下载"): ${url}"
  xyz_info "$(xyz_t "Saving to" "保存到"): ${dest}"
  if xyz_need_cmd curl; then
    curl -fsSL --connect-timeout 20 --max-time 180 --retry 2 --retry-delay 1 \
      -o "${dest}" "${url}"
  elif xyz_need_cmd wget; then
    wget -q --timeout=60 -O "${dest}" "${url}"
  else
    xyz_error "$(xyz_t "Need curl or wget to download files." "需要 curl 或 wget 才能下载文件。")"
    exit 1
  fi
  if [[ ! -s "${dest}" ]]; then
    xyz_error "$(xyz_t "Download failed or file is empty:" "下载失败或文件为空：") ${url}"
    exit 1
  fi
  if xyz_need_cmd sha256sum; then
    xyz_info "SHA256: $(sha256sum "${dest}" | awk '{print $1}')"
  elif xyz_need_cmd shasum; then
    xyz_info "SHA256: $(shasum -a 256 "${dest}" | awk '{print $1}')"
  fi
}

xyz_run_upstream() {
  # xyz_run_upstream URL [args...]
  # Downloads an official installer, shows the URL and a short preview, then
  # runs it only after confirmation (unless -y / YES=1).
  local url="$1"
  shift
  local dest
  xyz_init_tmpdir
  dest="$(xyz_tmpdir)/upstream.sh"
  xyz_fetch "${url}" "${dest}"
  chmod +x "${dest}"
  xyz_info "$(xyz_t "Preview (first 20 lines):" "预览（前 20 行）：")"
  sed -n '1,20p' "${dest}" || true
  printf '%s\n' "${XYZ_C_DIM}...${XYZ_C_RESET}"
  # Default --dry-run: verify the download and preview, do not execute.
  # Scripts that forward --dry-run to upstream (e.g. docker) set
  # XYZ_FORWARD_DRY_RUN=1 so the official script still runs with that flag.
  if [[ "${XYZ_DRY_RUN:-0}" == "1" && "${XYZ_FORWARD_DRY_RUN:-0}" != "1" ]]; then
    xyz_info "$(xyz_t \
      "Dry-run: official script downloaded and previewed; not executing it." \
      "演练模式：已下载并预览官方脚本，不会执行。")"
    return 0
  fi
  if ! xyz_confirm "$(xyz_t \
    "Run this official upstream script?" \
    "运行这份官方上游脚本？")"; then
    xyz_error "$(xyz_t "Aborted by user." "已取消。")"
    exit 1
  fi
  xyz_step "$(xyz_t "Executing upstream script" "正在执行上游脚本")"
  # Never let the upstream script inherit our stdin: under `curl | bash` that
  # is the rest of this very script. Give it the terminal if there is one,
  # otherwise /dev/null. Interactive installers set XYZ_UPSTREAM_NEEDS_TTY=1.
  if xyz_open_tty; then
    local tty_fd="${XYZ_TTY_FD}"
    XYZ_TTY_FD=""
    bash "${dest}" "$@" <&"${tty_fd}"
    local rc=$?
    exec {tty_fd}>&- 2>/dev/null || true
    return "${rc}"
  fi
  if [[ "${XYZ_UPSTREAM_NEEDS_TTY:-0}" == "1" ]]; then
    xyz_error "$(xyz_t \
      "This official installer is interactive and needs a terminal. Log in with SSH and run: bash <(curl -fsSL ${XYZ_BASE}/${XYZ_NAME})" \
      "这个官方安装脚本需要交互，必须在终端里运行。请用 SSH 登录后执行：bash <(curl -fsSL ${XYZ_BASE}/${XYZ_NAME})")"
    exit 1
  fi
  bash "${dest}" "$@" </dev/null
}

# --- small shared helpers ----------------------------------------------------
xyz_strip_ansi() {
  sed -e 's/\x1b\[[0-9;?]*[A-Za-z]//g' -e 's/\r//g'
}

# Effective SSH port: sshd -T (what sshd really uses) > config files > env > 22.
xyz_effective_ssh_port() {
  local port=""
  if xyz_need_cmd sshd; then
    port="$(sshd -T 2>/dev/null | awk '$1=="port" {print $2; exit}' || true)"
  fi
  if [[ -z "${port}" && -d /etc/ssh/sshd_config.d ]]; then
    port="$(cat /etc/ssh/sshd_config.d/*.conf 2>/dev/null | awk 'tolower($1)=="port" {print $2; exit}' || true)"
  fi
  if [[ -z "${port}" && -f /etc/ssh/sshd_config ]]; then
    port="$(awk 'tolower($1)=="port" {print $2; exit}' /etc/ssh/sshd_config || true)"
  fi
  if [[ -z "${port}" && -n "${SSH_CONNECTION:-}" ]]; then
    port="$(printf '%s' "${SSH_CONNECTION}" | awk '{print $4}')"
  fi
  printf '%s' "${port:-22}"
}

xyz_has_systemd() {
  [[ -d /run/systemd/system ]] && xyz_need_cmd systemctl
}

# Back up a file once per run as FILE.xyz-bak-YYYYmmddHHMMSS and print the path.
xyz_backup_file() {
  local f="$1"
  local bak
  bak="${f}.xyz-bak-$(date +%Y%m%d%H%M%S)"
  if [[ -e "${f}" ]]; then
    cp -a "${f}" "${bak}"
    printf '%s' "${bak}"
  fi
}

# --- misc -------------------------------------------------------------------
xyz_usage_exit() {
  if [[ "${1:-}" != "" ]]; then
    printf '%s\n' "$1"
  fi
  exit 0
}

# xyz.sh terminal report helpers: frames, colored badges, bar charts.
# Shared by speedtest-cn, route, unlock and all. Pure bash, no telemetry.
#
# Colors: on only when stdout is a terminal (or XYZ_COLOR=always). Off with
# --no-color, NO_COLOR=1 or XYZ_COLOR=never.
# Glyphs: Unicode box drawing when the locale is UTF-8, otherwise ASCII
# (force with XYZ_ASCII=1 or XYZ_UTF8=1). Frames are 78 columns wide.

# shellcheck disable=SC2034
XYZ_UI_LOADED=1
XYZ_UI_WIDTH=78

xyz_ui_init() {
  local want="${XYZ_COLOR:-auto}"
  [[ "${want}" == "auto" && -n "${NO_COLOR:-}" ]] && want="never"
  [[ "${XYZ_NO_COLOR:-0}" == "1" ]] && want="never"
  XYZ_UI_COLOR=0
  case "${want}" in
    always) XYZ_UI_COLOR=1 ;;
    never) XYZ_UI_COLOR=0 ;;
    *) [[ -t 1 ]] && XYZ_UI_COLOR=1 ;;
  esac
  if [[ "${XYZ_UI_COLOR}" == "1" ]]; then
    U_X=$'\033[0m'; U_B=$'\033[1m'; U_D=$'\033[2m'
    U_RED=$'\033[31m'; U_G=$'\033[32m'; U_Y=$'\033[33m'
    U_BL=$'\033[34m'; U_M=$'\033[35m'; U_C=$'\033[36m'
  else
    U_X=""; U_B=""; U_D=""; U_RED=""; U_G=""; U_Y=""; U_BL=""; U_M=""; U_C=""
  fi
  XYZ_UI_UTF8=0
  if [[ "${XYZ_ASCII:-0}" != "1" ]]; then
    case "${LC_ALL:-${LC_CTYPE:-${LANG:-}}}" in
      *[Uu][Tt][Ff]-8*|*[Uu][Tt][Ff]8*) XYZ_UI_UTF8=1 ;;
      *) XYZ_UI_UTF8=0 ;;
    esac
    [[ "${XYZ_UTF8:-0}" == "1" ]] && XYZ_UI_UTF8=1
  fi
  if [[ "${XYZ_UI_UTF8}" == "1" ]]; then
    G_H="─"; G_V="│"; G_TL="╭"; G_TR="╮"; G_BL="╰"; G_BR="╯"; G_LT="├"; G_RT="┤"
    G_FULL="█"; G_EMPTY="░"; G_OK="✔"; G_BAD="✘"; G_UNK="?"; G_DOT="●"; G_STAR="★"
    G_DOWN="↓"; G_UP="↑"; G_WARN="⚠"; G_MID="·"; G_TIMES="×"
  else
    G_H="-"; G_V="|"; G_TL="+"; G_TR="+"; G_BL="+"; G_BR="+"; G_LT="+"; G_RT="+"
    G_FULL="#"; G_EMPTY="."; G_OK="+"; G_BAD="x"; G_UNK="?"; G_DOT="*"; G_STAR="*"
    G_DOWN="v"; G_UP="^"; G_WARN="!"; G_MID="-"; G_TIMES="x"
  fi
}

# Display width of a string: ANSI codes removed, CJK counted as 2 columns.
xyz_ui_w() {
  local s="$1" pre rest
  while [[ "${s}" == *$'\033['* ]]; do
    pre="${s%%$'\033['*}"
    rest="${s#*$'\033['}"
    rest="${rest#*m}"
    s="${pre}${rest}"
  done
  local LC_ALL=C
  local a="${s//[^ -~]/}"
  local one="${s//[^$'\xc2'-$'\xdf'$'\xe2']/}"
  local two="${s//[^$'\xe3'-$'\xef']/}"
  printf '%d' $(( ${#a} + ${#one} + 2 * ${#two} ))
}

xyz_ui_rep() {
  # xyz_ui_rep CHAR N
  local out="" n="$2"
  while (( n > 0 )); do out="${out}$1"; n=$((n - 1)); done
  printf '%s' "${out}"
}

xyz_ui_pad() {
  # xyz_ui_pad TEXT WIDTH  (left aligned, never truncates)
  local w
  w="$(xyz_ui_w "$1")"
  printf '%s%s' "$1" "$(xyz_ui_rep ' ' $(( $2 - w )))"
}

xyz_ui_lpad() {
  # xyz_ui_lpad TEXT WIDTH  (right aligned)
  local w
  w="$(xyz_ui_w "$1")"
  printf '%s%s' "$(xyz_ui_rep ' ' $(( $2 - w )))" "$1"
}

xyz_ui_top() {
  local title=" $1 " w
  w="$(xyz_ui_w "${title}")"
  printf '%s%s%s%s%s%s%s\n' "${U_C}" "${G_TL}${G_H}" "${U_X}${U_B}" "${title}" "${U_X}${U_C}" \
    "$(xyz_ui_rep "${G_H}" $(( XYZ_UI_WIDTH - 3 - w )))${G_TR}" "${U_X}"
}

xyz_ui_sep() {
  local label="${1:-}" w=0
  if [[ -n "${label}" ]]; then
    label=" ${label} "
    w="$(xyz_ui_w "${label}")"
    printf '%s%s%s%s%s%s%s\n' "${U_C}" "${G_LT}${G_H}" "${U_X}${U_B}" "${label}" "${U_X}${U_C}" \
      "$(xyz_ui_rep "${G_H}" $(( XYZ_UI_WIDTH - 3 - w )))${G_RT}" "${U_X}"
  else
    printf '%s%s%s\n' "${U_C}" "${G_LT}$(xyz_ui_rep "${G_H}" $(( XYZ_UI_WIDTH - 2 )))${G_RT}" "${U_X}"
  fi
}

xyz_ui_row() {
  local text="$1" inner=$(( XYZ_UI_WIDTH - 4 )) plain
  if (( $(xyz_ui_w "${text}") > inner )); then
    # too wide: drop colors and cut to fit, ending with "~"
    plain="$(printf '%s' "${text}" | sed 's/\x1b\[[0-9;]*m//g')"
    plain="${plain:0:inner}"
    while (( $(xyz_ui_w "${plain}") > inner - 1 )); do plain="${plain%?}"; done
    text="${plain}~"
  fi
  printf '%s%s%s %s %s%s%s\n' "${U_C}" "${G_V}" "${U_X}" "$(xyz_ui_pad "${text}" "${inner}")" "${U_C}" "${G_V}" "${U_X}"
}

xyz_ui_bottom() {
  printf '%s%s%s\n' "${U_C}" "${G_BL}$(xyz_ui_rep "${G_H}" $(( XYZ_UI_WIDTH - 2 )))${G_BR}" "${U_X}"
}

xyz_ui_bar() {
  # xyz_ui_bar VALUE MAX WIDTH [COLOR]  -> filled/empty bar (at least 1 cell if VALUE > 0)
  local n color="${4:-${U_G}}"
  n="$(awk -v v="${1:-0}" -v m="${2:-0}" -v w="$3" 'BEGIN {
    if (m <= 0 || v <= 0) { print 0; exit }
    n = int(v / m * w + 0.5); if (n < 1) n = 1; if (n > w) n = w; print n }')"
  printf '%s%s%s%s%s' "${color}" "$(xyz_ui_rep "${G_FULL}" "${n}")" "${U_D}" "$(xyz_ui_rep "${G_EMPTY}" $(( $3 - n )))" "${U_X}"
}

xyz_ui_usage() {
  # xyz_ui_usage PERCENT WIDTH -> colored usage bar + percent (red > 90, yellow > 75)
  local p="${1:-0}" color="${U_G}"
  p="${p%%.*}"; [[ "${p}" =~ ^[0-9]+$ ]] || p=0
  (( p > 75 )) && color="${U_Y}"
  (( p > 90 )) && color="${U_RED}"
  printf '%s %s%3d%%%s' "$(xyz_ui_bar "${p}" 100 "$2" "${color}")" "${color}" "${p}" "${U_X}"
}

xyz_ui_badge() {
  # xyz_ui_badge yes|no|partial|unknown|ok|skip [TEXT]
  local txt="${2:-}"
  case "$1" in
    yes|ok) printf '%s%s %s%s' "${U_G}" "${G_OK}" "${txt:-$(xyz_t "yes" "解锁")}" "${U_X}" ;;
    no|fail) printf '%s%s %s%s' "${U_RED}" "${G_BAD}" "${txt:-$(xyz_t "no" "不可用")}" "${U_X}" ;;
    partial) printf '%s%s %s%s' "${U_Y}" "${G_UNK}" "${txt:-$(xyz_t "partial" "部分")}" "${U_X}" ;;
    skip) printf '%s%s %s%s' "${U_D}" "-" "${txt:-$(xyz_t "skipped" "跳过")}" "${U_X}" ;;
    *) printf '%s%s %s%s' "${U_Y}" "${G_UNK}" "${txt:-$(xyz_t "unknown" "未知")}" "${U_X}" ;;
  esac
}

xyz_ui_line_class() {
  # premium | good | ordinary | other
  case "$1" in
    CN2-GIA|9929/CUII|9929|CMIN2) printf 'premium' ;;
    CN2-GT) printf 'good' ;;
    163|4837|CMI|CMNET) printf 'ordinary' ;;
    *) printf 'other' ;;
  esac
}

xyz_ui_linetags() {
  # xyz_ui_linetags "CN2-GIA 9929/CUII" -> colored tags
  local t out="" c
  for t in $1; do
    case "$(xyz_ui_line_class "${t}")" in
      premium) c="${U_G}${U_B}" ;;
      good) c="${U_C}" ;;
      ordinary) c="${U_Y}" ;;
      *) c="${U_D}" ;;
    esac
    out="${out}${out:+ }${c}${t}${U_X}"
  done
  printf '%s' "${out:-${U_D}?${U_X}}"
}

xyz_ui_fill() {
  # Replace empty TSV fields with "-" (bash read collapses consecutive tabs).
  awk -F'\t' -v OFS='\t' '{ for (i = 1; i <= NF; i++) if ($i == "") $i = "-"; print }' "$1"
}

xyz_ui_carrier() {
  case "$1" in
    nearest) xyz_t "Local" "本地" ;;
    ct) xyz_t "Telecom" "电信" ;;
    cu) xyz_t "Unicom" "联通" ;;
    cm) xyz_t "Mobile" "移动" ;;
    custom) xyz_t "Custom" "自定义" ;;
    hk) xyz_t "HK" "香港" ;;
    tokyo) xyz_t "Tokyo" "东京" ;;
    singapore) xyz_t "SGP" "新加坡" ;;
    us-west) xyz_t "US West" "美西" ;;
    *) printf '%s' "$1" ;;
  esac
}

xyz_ui_carrier_color() {
  case "$1" in
    ct|tokyo) printf '%s' "${U_BL}" ;;
    cu) printf '%s' "${U_RED}" ;;
    cm|singapore) printf '%s' "${U_G}" ;;
    hk) printf '%s' "${U_Y}" ;;
    *) printf '%s' "${U_M}" ;;
  esac
}

xyz_ui_fmt_num() {
  # 2 decimals below 1000, 1 decimal above
  awk -v v="${1:-0}" 'BEGIN { if (v >= 1000) printf "%.1f", v; else printf "%.2f", v }'
}

# xyz_ui_speed_rows FILE
# FILE: carrier id label down up ping loss status [engine] [note] (TSV, Mbps / ms)
xyz_ui_speed_rows() {
  local f="$1" max carrier id label down up lat loss status engine note head
  [[ -s "${f}" ]] || return 0
  max="$(awk -F'\t' '$8=="ok" { if ($4+0 > m) m = $4+0; if ($5+0 > m) m = $5+0 } END { print m+0 }' "${f}")"
  while IFS=$'\t' read -r carrier id label down up lat loss status engine note; do
    [[ "${engine}" == "-" ]] && engine=""
    head="$(xyz_ui_carrier_color "${carrier}")$(xyz_ui_pad "$(xyz_ui_carrier "${carrier}")" 8)${U_X}${U_B}${label}${U_X}${U_D} #${id}${engine:+ ${G_MID} ${engine}}${U_X}"
    xyz_ui_row "${head}"
    if [[ "${status}" == "ok" ]]; then
      local pc="${U_G}"
      lat="${lat:-?}"
      awk -v p="${lat}" 'BEGIN { exit !(p+0 > 150) }' 2>/dev/null && pc="${U_Y}"
      awk -v p="${lat}" 'BEGIN { exit !(p+0 > 250) }' 2>/dev/null && pc="${U_RED}"
      xyz_ui_row "  ${G_DOWN} $(xyz_ui_bar "${down}" "${max}" 14 "${U_G}") $(xyz_ui_lpad "$(xyz_ui_fmt_num "${down}")" 7) Mbps  ${G_UP} $(xyz_ui_bar "${up}" "${max}" 14 "${U_C}") $(xyz_ui_lpad "$(xyz_ui_fmt_num "${up}")" 7) Mbps  ${pc}$(xyz_ui_lpad "${lat}" 6)ms${U_X}"
    else
      [[ "${note}" == "-" ]] && note=""
      xyz_ui_row "  $(xyz_ui_badge skip "$(xyz_t "skipped" "跳过")")${U_D}${note:+ ${G_MID} ${note:0:62}}${U_X}"
    fi
  done < <(xyz_ui_fill "${f}")
}

xyz_ui_speed_table() {
  # xyz_ui_speed_table FILE TITLE
  xyz_ui_top "$2"
  xyz_ui_speed_rows "$1"
  xyz_ui_bottom
}

# Route grid. FILE: target label kind hops [key]   (key like bj-ct)
xyz_ui_route_key() {
  case "$1" in
    219.141.140.10) printf 'bj-ct' ;; 202.106.195.68) printf 'bj-cu' ;; 221.179.155.161) printf 'bj-cm' ;;
    202.96.209.133) printf 'sh-ct' ;; 210.22.97.1) printf 'sh-cu' ;; 211.136.112.200) printf 'sh-cm' ;;
    58.60.188.222) printf 'gz-ct' ;; 210.21.196.6) printf 'gz-cu' ;; 120.196.165.24) printf 'gz-cm' ;;
    *) printf '' ;;
  esac
}

xyz_ui_route_rows() {
  local f="$1" target label kind hops key city c cell line extra=0
  local -A K=()
  [[ -s "${f}" ]] || return 0
  while IFS=$'\t' read -r target label kind hops key; do
    [[ -z "${key}" || "${key}" == "-" ]] && key="$(xyz_ui_route_key "${target}")"
    if [[ -n "${key}" ]]; then
      K["${key}"]="${kind}"
    else
      extra=1
    fi
  done < <(xyz_ui_fill "${f}")
  if (( ${#K[@]} > 0 )); then
    xyz_ui_row "${U_D}$(xyz_ui_pad "" 10)$(xyz_ui_pad "$(xyz_ui_carrier ct)" 21)$(xyz_ui_pad "$(xyz_ui_carrier cu)" 21)$(xyz_ui_carrier cm)${U_X}"
    for city in bj sh gz; do
      case "${city}" in
        bj) line="$(xyz_ui_pad "$(xyz_t "Beijing" "北京")" 10)" ;;
        sh) line="$(xyz_ui_pad "$(xyz_t "Shanghai" "上海")" 10)" ;;
        *) line="$(xyz_ui_pad "$(xyz_t "Guangzhou" "广州")" 10)" ;;
      esac
      for c in ct cu cm; do
        cell="${K[${city}-${c}]-}"
        [[ "${cell}" == *" ("* || "${cell}" == unknown* || "${cell}" == 未识别* ]] && cell="?"
        if [[ -z "${cell}" ]]; then cell="${U_D}-${U_X}"; else cell="$(xyz_ui_linetags "${cell}")"; fi
        line="${line}$(xyz_ui_pad "${cell}" 21)"
      done
      xyz_ui_row "${line}"
    done
  fi
  if [[ "${extra}" == "1" ]]; then
    while IFS=$'\t' read -r target label kind hops key; do
      [[ -z "${key}" || "${key}" == "-" ]] && key="$(xyz_ui_route_key "${target}")"
      [[ -n "${key}" ]] && continue
      xyz_ui_row "$(xyz_ui_pad "${label:-${target}}" 22) $(xyz_ui_linetags "${kind}")"
    done < <(xyz_ui_fill "${f}")
  fi
  xyz_ui_row "${U_D}$(xyz_t "Legend:" "图例：")${U_X} ${U_G}${U_B}$(xyz_t "premium" "优质")${U_X} CN2-GIA/9929/CMIN2  ${U_C}CN2-GT${U_X}  ${U_Y}$(xyz_t "ordinary" "普通")${U_X} 163/4837/CMI"
}

xyz_ui_route_score() {
  # prints 0-100 (average best class per target) or nothing
  local f="$1" kind t best n=0 sum=0 cls
  [[ -s "${f}" ]] || return 0
  while IFS=$'\t' read -r _ _ kind _ _; do
    best=0
    for t in ${kind}; do
      cls="$(xyz_ui_line_class "${t}")"
      case "${cls}" in premium) best=100 ;; good) (( best < 75 )) && best=75 ;; ordinary) (( best < 40 )) && best=40 ;; *) : ;; esac
    done
    n=$((n + 1)); sum=$((sum + best))
  done < "${f}"
  (( n > 0 )) && printf '%d' $(( sum / n ))
}

# Unlock grid. FILE: service status region note
xyz_ui_unlock_rows() {
  local f="$1" svc st reg note cells=() i cell
  [[ -s "${f}" ]] || return 0
  while IFS=$'\t' read -r svc st reg note; do
    cell="$(xyz_ui_badge "${st}" "$(xyz_ui_pad "${svc}" 16)")"
    [[ "${reg}" != "-" ]] && cell="${cell} ${U_D}${reg:0:12}${U_X}"
    cells+=("${cell}")
  done < <(xyz_ui_fill "${f}")
  for (( i = 0; i < ${#cells[@]}; i += 2 )); do
    xyz_ui_row "$(xyz_ui_pad "${cells[$i]}" 37)${cells[$((i + 1))]-}"
  done
}

xyz_ui_unlock_count() {
  # prints "yes total"
  awk -F'\t' '{ n++; if ($2 == "yes") y++ } END { printf "%d %d\n", y, n }' "$1"
}

xyz_ui_init

XYZ_NAME="backtrace"

# xyz.sh/route — back-route / traceroute test (NextTrace, with traceroute fallback).
#
# Official NextTrace : https://github.com/nxtrace/NTrace-core
# Official installer : https://nxtrace.org/nt
# Docs / homepage    : https://nxtrace.github.io/NTrace-core/
#
# If `nexttrace` is missing, this wrapper downloads the official installer
# (after confirmation) and then traces a short list of well-known resolvers.
# Custom targets are accepted as arguments.
#
# Usage:
#   curl -fsSL xyz.sh/route | bash
#   curl -fsSL xyz.sh/route | bash -s -- 1.1.1.1 8.8.8.8
#   curl -fsSL xyz.sh/route | bash -s -- --install-only
#   curl -fsSL xyz.sh/route | bash -s -- --traceroute   # force classic traceroute
#   curl -fsSL xyz.sh/route | bash -s -- --cn -y        # back-route to CT/CU/CM (BJ/SH/GZ)
#   curl -fsSL xyz.sh/backtrace | bash -s -- -y         # same as --cn
#
# --cn traces to nine public resolver/backbone addresses of China Telecom,
# China Unicom and China Mobile in Beijing, Shanghai and Guangzhou, then prints
# a heuristic line-type summary (CN2 GIA / CN2 GT / 163 / 9929 / 4837 /
# CMIN2 / CMI) based on the ASNs and hop prefixes NextTrace reports.
#
# Default targets: 1.1.1.1, 8.8.8.8, 223.5.5.5, 119.29.29.29
# Supported: Debian, Ubuntu, CentOS, Rocky, AlmaLinux.
# Root is preferred (ICMP). No telemetry is added by this wrapper.

set -euo pipefail

if [[ -z "${XYZ_COMMON_LOADED:-}" ]]; then
  _xyz_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
  if [[ -f "${_xyz_dir}/lib/common.sh" ]]; then
    # shellcheck source=lib/common.sh
    source "${_xyz_dir}/lib/common.sh"
  else
    echo "xyz.sh: missing lib/common.sh" >&2
    exit 1
  fi
fi

if [[ -z "${XYZ_UI_LOADED:-}" ]]; then
  _xyz_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
  # shellcheck source=lib/report.sh
  source "${_xyz_dir}/lib/report.sh"
fi
XYZ_NAME="${XYZ_NAME:-route}"
case "${XYZ_NAME}" in route|backtrace) : ;; *) XYZ_NAME="route" ;; esac
XYZ_TITLE="$(xyz_t "Back-route test" "回程路由测试")"
XYZ_UPSTREAM="https://nxtrace.org/nt"
xyz_init "$@"
xyz_prefer_root

INSTALL_ONLY=0
FORCE_TRACEROUTE=0
CN_MODE=0
TARGETS=()
if [[ "${XYZ_NAME}" == "backtrace" ]]; then
  CN_MODE=1
fi

for arg in "${XYZ_ARGS[@]+"${XYZ_ARGS[@]}"}"; do
  case "${arg}" in
    --install-only) INSTALL_ONLY=1 ;;
    --traceroute) FORCE_TRACEROUTE=1 ;;
    --cn|--china|--backtrace) CN_MODE=1 ;;
    --help|-h) XYZ_HELP=1 ;;
    -*)
      xyz_error "$(xyz_t "Unknown argument:" "未知参数：") ${arg}"
      exit 1
      ;;
    *)
      TARGETS+=("${arg}")
      ;;
  esac
done

if [[ "${XYZ_HELP:-}" == "1" ]]; then
  cat <<EOF
$(xyz_t "Usage:" "用法：")
  curl -fsSL xyz.sh/route | bash
  curl -fsSL xyz.sh/route | bash -s -- 1.1.1.1 example.com
  curl -fsSL xyz.sh/route | bash -s -- --install-only
  curl -fsSL xyz.sh/route | bash -s -- --traceroute
  curl -fsSL xyz.sh/route | bash -s -- --cn -y
  curl -fsSL xyz.sh/backtrace | bash -s -- -y

$(xyz_t "Default targets:" "默认目标：") 1.1.1.1  8.8.8.8  223.5.5.5  119.29.29.29
$(xyz_t "--cn: China Telecom / Unicom / Mobile in Beijing, Shanghai, Guangzhou, with a line-type summary." "--cn：北京、上海、广州的电信 / 联通 / 移动三网回程，并给出线路类型判断。")
NextTrace: https://github.com/nxtrace/NTrace-core
EOF
  exit 0
fi

# target|label-en|label-zh|carrier
CN_TARGETS=(
  "219.141.140.10|Beijing Telecom|北京电信|ct"
  "202.106.195.68|Beijing Unicom|北京联通|cu"
  "221.179.155.161|Beijing Mobile|北京移动|cm"
  "202.96.209.133|Shanghai Telecom|上海电信|ct"
  "210.22.97.1|Shanghai Unicom|上海联通|cu"
  "211.136.112.200|Shanghai Mobile|上海移动|cm"
  "58.60.188.222|Guangzhou Telecom|广州电信|ct"
  "210.21.196.6|Guangzhou Unicom|广州联通|cu"
  "120.196.165.24|Guangzhou Mobile|广州移动|cm"
)
if ((${#TARGETS[@]} == 0)); then
  if [[ "${CN_MODE}" == "1" ]]; then
    for _t in "${CN_TARGETS[@]}"; do
      TARGETS+=("${_t%%|*}")
    done
  else
    TARGETS=(1.1.1.1 8.8.8.8 223.5.5.5 119.29.29.29)
  fi
fi

xyz_install_nexttrace() {
  xyz_require_root
  xyz_require_supported_os
  xyz_info "$(xyz_t \
    "nexttrace is not installed. The official NextTrace installer will be downloaded." \
    "未找到 nexttrace。即将下载 NextTrace 官方安装脚本。")"
  xyz_info "Installer: ${XYZ_UPSTREAM}"
  xyz_info "Project:   https://github.com/nxtrace/NTrace-core"
  xyz_run_upstream "${XYZ_UPSTREAM}"
}

if [[ "${FORCE_TRACEROUTE}" != "1" ]] && ! xyz_need_cmd nexttrace; then
  if [[ "${INSTALL_ONLY}" == "1" ]] || xyz_confirm "$(xyz_t \
    "Install official NextTrace now?" \
    "现在安装官方 NextTrace？")"; then
    xyz_install_nexttrace
  else
    xyz_warn "$(xyz_t "Skipping NextTrace install; will try traceroute/tracepath." "跳过 NextTrace 安装，将尝试 traceroute/tracepath。")"
    FORCE_TRACEROUTE=1
  fi
fi

if [[ "${XYZ_DRY_RUN:-0}" == "1" && "${INSTALL_ONLY}" != "1" && "${FORCE_TRACEROUTE}" != "1" ]] && ! xyz_need_cmd nexttrace; then
  xyz_info "$(xyz_t \
    "Dry-run: official NextTrace installer downloaded; not executing it, so no trace was run." \
    "演练模式：已下载 NextTrace 官方安装脚本，未执行，因此没有进行路由测试。")"
  exit 0
fi

if [[ "${INSTALL_ONLY}" == "1" ]]; then
  if xyz_need_cmd nexttrace; then
    nexttrace --version || true
    xyz_info "$(xyz_t "Install-only requested; not running traces." "仅安装，不进行路由测试。")"
    exit 0
  fi
  if [[ "${XYZ_DRY_RUN:-0}" == "1" ]]; then
    xyz_info "$(xyz_t \
      "Dry-run: official NextTrace installer downloaded; not executing it, so nexttrace is not installed." \
      "演练模式：已下载 NextTrace 官方安装脚本，未执行，因此尚未安装 nexttrace。")"
    exit 0
  fi
  xyz_error "$(xyz_t "nexttrace is still not available." "仍然找不到 nexttrace。")"
  exit 1
fi

cn_label() {
  local ip="$1" t
  for t in "${CN_TARGETS[@]}"; do
    if [[ "${t%%|*}" == "${ip}" ]]; then
      xyz_t "$(printf '%s' "${t}" | cut -d'|' -f2)" "$(printf '%s' "${t}" | cut -d'|' -f3)"
      return 0
    fi
  done
  printf '%s' "${ip}"
}

# Heuristic line type from a trace log (ASNs / well-known hop prefixes).
line_type() {
  local log="$1" types=""
  if grep -q -E 'AS4809|59\.43\.' "${log}"; then
    if grep -q -E '202\.97\.' "${log}"; then types="${types} CN2-GT"; else types="${types} CN2-GIA"; fi
  elif grep -q -E 'AS4134|202\.97\.' "${log}"; then
    types="${types} 163"
  fi
  grep -q -E 'AS9929|AS10099|218\.105\.|210\.51\.' "${log}" && types="${types} 9929/CUII"
  grep -q -E 'AS4837|219\.158\.' "${log}" && types="${types} 4837"
  grep -q -E 'AS58807|223\.120\.(1[2-9][0-9]|2[0-9][0-9])\.' "${log}" && types="${types} CMIN2"
  grep -q -E 'AS58453' "${log}" && types="${types} CMI"
  grep -q -E 'AS9808|221\.183\.|221\.176\.' "${log}" && [[ "${types}" != *CMI* ]] && types="${types} CMNET"
  printf '%s' "${types# }"
}

TRACE_DIR=""
if [[ "${CN_MODE}" == "1" ]]; then
  xyz_init_tmpdir
  TRACE_DIR="$(xyz_tmpdir)/traces"
  mkdir -p "${TRACE_DIR}"
fi

run_one() {
  local target="$1"
  local log="/dev/null"
  [[ -n "${TRACE_DIR}" ]] && log="${TRACE_DIR}/${target//[^A-Za-z0-9.]/_}.log"
  echo
  if [[ "${CN_MODE}" == "1" ]]; then
    xyz_step "$(xyz_t "Tracing" "正在追踪"): $(cn_label "${target}") ${target}"
  else
    xyz_step "$(xyz_t "Tracing" "正在追踪"): ${target}"
  fi
  if [[ "${FORCE_TRACEROUTE}" != "1" ]] && xyz_need_cmd nexttrace; then
    nexttrace -q 1 "${target}" 2>&1 | tee "${log}" || true
  elif xyz_need_cmd traceroute; then
    traceroute -n -q 1 -w 2 "${target}" 2>&1 | tee "${log}" || true
  elif xyz_need_cmd tracepath; then
    tracepath -n "${target}" 2>&1 | tee "${log}" || true
  else
    xyz_error "$(xyz_t \
      "No nexttrace, traceroute, or tracepath command is available." \
      "找不到 nexttrace、traceroute 或 tracepath。")"
    return 1
  fi
}

for t in "${TARGETS[@]}"; do
  run_one "${t}"
done

if [[ "${CN_MODE}" == "1" ]]; then
  echo
  ROUTE_VIEW="$(xyz_tmpdir)/route-view.tsv"
  : > "${ROUTE_VIEW}"
  for t in "${TARGETS[@]}"; do
    log="${TRACE_DIR}/${t//[^A-Za-z0-9.]/_}.log"
    kind="$(line_type "${log}")"
    hops="$(grep -c -E '^ *[0-9]+ ' "${log}" 2>/dev/null || true)"
    if [[ -z "${kind}" ]]; then
      kind="$(xyz_t "unknown (no recognizable hops)" "未识别（没有可识别的节点）")"
    fi
    key="$(xyz_ui_route_key "${t}")"
    printf '%s\t%s\t%s\t%s\t%s\n' "${t}" "$(cn_label "${t}")" "${kind}" "${hops:-0}" "${key}" >> "${ROUTE_VIEW}"
    if [[ -n "${XYZ_RESULT_FILE:-}" ]]; then
      printf 'route\t%s\t%s\t%s\t%s\t%s\n' "${t}" "$(cn_label "${t}")" "${kind}" "${hops:-0}" "${key}" >> "${XYZ_RESULT_FILE}" 2>/dev/null || true
    fi
  done
  xyz_ui_top "$(xyz_t "Back-route summary (heuristic, based on ASNs/hops seen)" "回程线路汇总（根据 ASN/节点推断）")"
  xyz_ui_route_rows "${ROUTE_VIEW}"
  xyz_ui_sep
  while IFS=$'\t' read -r t label kind _ _; do
    xyz_ui_row "$(xyz_ui_pad "${label}" 20)${U_D}$(xyz_ui_pad "${t}" 17)${U_X}$(xyz_ui_linetags "${kind}")"
  done < "${ROUTE_VIEW}"
  xyz_ui_bottom
  echo
  xyz_info "$(xyz_t \
    "Line types are inferred from public ASN/prefix patterns and can be wrong. Read the hops above." \
    "线路类型由公开的 ASN/网段规则推断，可能不准，请以上面的逐跳结果为准。")"
fi

xyz_info "$(xyz_t "All traces finished." "全部追踪结束。")"