使用 pfctl 和 dnctl 在 OSX 10.10 上進行流量整形

使用 pfctl 和 dnctl 在 OSX 10.10 上進行流量整形

pfctl我正在嘗試通過和在 Mac OS X 10.10 上進行流量整形(節流)dnctl

我已經使用 netcat ( ) 和合成隨機負載檔案實作了一個簡單的測試伺服器和客戶端,nc以驗證我的虛擬網路管道節流是否正常運作。到目前為止,嘗試使用以下命令配置虛擬網路管道Murus 防火牆 GUI 應用程式似乎沒有正確限制流量(64MB 傳輸在約 200 毫秒內完成)。

下面是一個完整範例的OSX bash shell 腳本(需要brew install coreutils) 。gdate如果您在一個終端中運行它:

./throttle-test.sh server

另一個是

./throttle-test.sh client

他們將嘗試透過您的en0介面傳輸 64MB 的有效負載(不使用,lo0因為其龐大的 MTU 與 WAN 流量不同)。

我還測試了將文件傳輸到遠端Linux 筆記型電腦,以查看來源IP 和目標IP 均為本地IP 是否繞過限制,但即使到我的LAN/wifi 上的遠端計算機,速度也比限制限制快得多。

我的問題是什麼是正確的腳本來配置pfctldnctl限制此文件傳輸到給定的頻寬限制(例如 8mbps)。限制的範圍可以是特定的TCP埠。

注意 OS X 10.10 不再包含,ipfw因此我正在尋找使用pfctl和的東西dnctl

這是我的throttle-test.sh文件:

#!/bin/bash
set -o errexit    # always exit on error
set -o errtrace   # trap errors in functions as well
set -o pipefail   # don't ignore exit codes when piping output
set -o posix      # more strict failures in subshells
# set -x          # enable debugging

IFS="$(printf "\n\t")"

setup_payload() {
  local payload_path="$1"
  local size_kbytes="$2"
  mkdir -p $(basename "${payload_path}")

  if [[ -f "${payload_path}" ]]; then
    local on_disk=$(wc -c < "${payload_path}")
  fi
  if [[ ${on_disk} -ne $((${size_kbytes} * 1024)) ]]; then
    echo "creating payload file ${payload_path}"
    dd if=/dev/urandom of="${payload_path}" \
      bs=1024 count="${size_kbytes}" &> /dev/null
  fi
}

start_server() {
  local payload_path="$1"
  local ip="$2"
  local port="$3"
  while true; do
    echo "Starting netcat server for ${payload_path} on ${ip}:${port}"
    nc -l "${ip}" "${port}" < "${payload_path}"
    sleep 1
  done
}

hash() {
  shasum -a 256 "$1" | cut -d " " -f 1
}

verify_hashes() {
  # Sanity check no funny business
  from_hash=$(hash "$1")
  to_hash=$(hash "$2")
  if [[ "${from_hash}" != "${to_hash}" ]]; then
    echo "checksums did not match ${from_hash} ${to_hash}" 1>&2
    exit 10
  fi
}

client() {
  local payload_path="$1"
  local ip="$2"
  local port="$3"

  # time how long it takes to transfer the payload file
  start=$(gdate +%s%3N)
  nc -d "${ip}" "${port}" > "${payload_path}.client"
  stop=$(gdate +%s%3N)

  verify_hashes "${payload_path}" "${payload_path}.client"

  local duration=$((${stop} - ${start}))
  echo "${duration}"
}

main() {
  local size_kbytes=$((64 * 1024)) # 64 MB
  local payload_path="/tmp/throttle-test/data-${size_kbytes}.bin"
  local port="${PORT-9112}"
  # You may need to change this if you are on linux
  local interface="${INTERFACE-en0}"
  local ip=$(ipconfig getifaddr "${interface}")

  setup_payload "${payload_path}" "${size_kbytes}"
  case "$1" in
    server)
      start_server "${payload_path}" "${ip}" "${port}"
    ;;
    client)
      local duration=$(client "${payload_path}" "${ip}" "${port}")
      echo "Transfered ${size_kbytes} kbytes in ${duration} ms"
    ;;
    *)
      echo "Usage: $0 <server|client>"
    ;;
  esac
}

main "$@"

更新

這是我到目前為止所擁有的。這對於下載方向似乎可以正常工作,但在上傳方向上根本無法節流。

throttle_start() {
  local down_mbps="$1"
  local up_mbps="$2"
  local delay=$(($3 / 2))
  sudo dnctl pipe 1 config bw "${down_mbps}Mbit/s" delay "${delay}"
  sudo dnctl pipe 2 config bw "${up_mbps}Mbit/s" delay "${delay}"
  (cat /etc/pf.conf && \
    echo 'dummynet-anchor "throttle"' && \
    echo 'anchor "throttle"') | sudo pfctl -f -
  cat << EOF | sudo pfctl -a throttle -f -
dummynet in quick proto tcp from any port = 9112 to any pipe 1
dummynet out quick proto tcp from any to any port = 9112 pipe 2
EOF
  sudo pfctl -q -e
}

答案1

這是我在 El Capitan 10.11 上使用的腳本,並取得了一些成功:

#!/bin/bash

# Reset dummynet to default config
dnctl -f flush

# Compose an addendum to the default config: creates a new anchor
(cat /etc/pf.conf &&
  echo 'dummynet-anchor "my_anchor"' &&
  echo 'anchor "my_anchor"') | pfctl -q -f -

# Configure the new anchor
cat <<EOF | pfctl -q -a my_anchor -f -
no dummynet quick on lo0 all
dummynet out proto tcp from any to any port 1:65535 pipe 1
EOF

# Create the dummynet queue
dnctl pipe 1 config bw 40000byte/s

# Activate PF
pfctl -E

# to check that dnctl is properly configured: sudo dnctl list

唯一相關的區別似乎是no dummynet quick on lo0 all,我真的不知道它的作用,在這裡找到:https://www.reddit.com/r/osx/comments/3g7dim/limiting_bandwidth_per_application/

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