通过 SSH 将远程端口映射到本地，或将本地端口映射到远程服务器

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通过 SSH 将远程端口映射到本地，或将本地端口映射到远程服务器

#!/usr/bin/env bash

set -e

HELP=""
MODE="L"
SOURCE_PORT=""
TARGET_PORT=""

for ARG in "$@"; do
  case "$ARG" in
  -h | --help)
    shift
    HELP="true"
    ;;

  -l | --local)
    shift
    if [ $# -ge 1 ] && [[ "${1}" != -* ]]; then
      SOURCE_PORT="${1}"
    fi
    ;;

  -m | --mode)
    shift
    if [ $# -ge 1 ] && [[ "${1}" != -* ]]; then
      if [[ "${1}" = "R" || "${1}" = "r" ]]; then
        MODE="R"
      fi
    fi
    ;;

  -r | --remote)
    shift
    if [ $# -ge 1 ] && [[ "${1}" != -* ]]; then
      TARGET_PORT="${1}"
    fi
    ;;

  *)
    shift
    ;;

  esac
done

if [[ -n "${HELP}" ]]; then
  echo "lbscp -m R/L -l SOURCE_PORT -m TARGET_PORT"
  exit
fi

if [[ -z "$SOURCE_PORT" || -z "$TARGET_PORT" ]]; then
  echo "请指定本地端口和远程端口"
  exit
fi

# 将远程端口映射到本地（远程端口转发）：
# ssh -L [本地端口]:[目标主机]:[目标端口] [用户名]@[远程主机]

# 将本地端口映射到远程（本地端口转发）：
# ssh -R [远程端口]:localhost:[本地端口] [用户名]@[远程主机]

KEY_PATH="$HOME/.ssh/keys/id_ed25519"
SERVER_INFO="root@192.168.3.33"

if [[ "$MODE" = "R" ]]; then
  echo "将本地端口 ${SOURCE_PORT} 映射到远程端口 ${TARGET_PORT}"
  # shellcheck disable=SC2086
  ssh -R "${TARGET_PORT}":127.0.0.1:"${SOURCE_PORT}" -N -i $KEY_PATH -p 2022 $SERVER_INFO
else
  echo "将远程端口 ${TARGET_PORT} 映射到本地端口 ${SOURCE_PORT}"
  # shellcheck disable=SC2086
  ssh -L "${SOURCE_PORT}":127.0.0.1:"${TARGET_PORT}" -N -i $KEY_PATH -p 2022 $SERVER_INFO
fi