前面的正则表达式无效

Question

我收到错误：

awk：错误的正则表达式'{|:|}'：前面的正则表达式无效 {"arguments":{},"result":"success"} {"port":37482}

我认为这与以下这句话有关：

PORT=$(echo $json | awk 'BEGIN{r=1;FS="{|:|}"} /port/{r=0; print $3} END{exit r}')
#echo $PORT

有人知道这是什么意思以及我该如何修复它吗？我是脚本新手，但据我所知，表达式 |:| 是不正确的。$json 是我从 VPN 中提取的文件，其中包含用于转发的端口信息。

我的意见：

#!/usr/bin/env bash
#
# Enable port forwarding when using Private Internet Access
#
# Usage:
#  ./port_forwarding.sh
TRANSUSER=xxx
TRANSPASS=xxxx
TRANSHOST=localhost
error( )
{
  echo "$@" 1>&2
  exit 1
}
error_and_usage( )
{
  echo "$@" 1>&2
  usage_and_exit 1
}
usage( )
{
  echo "Usage: `dirname $0`/$PROGRAM"
}
usage_and_exit( )
{
  usage
  exit $1
}
version( )
{
  echo "$PROGRAM version $VERSION"
}

port_forward_assignment( )
{
  client_id_file="/etc/openvpn/pia_client_id"
  if [ ! -f "$client_id_file" ]; then
    if hash shasum 2>/dev/null; then
      head -n 100 /dev/urandom | shasum -a 256 | tr -d " -" > "$client_id_file"
    elif hash sha256sum 2>/dev/null; then
      head -n 100 /dev/urandom | sha256sum | tr -d " -" > "$client_id_file"
    else
      echo "Please install shasum or sha256sum, and make sure it is visible in your \$PATH"
      exit 1
    fi
  fi
  client_id=`cat "$client_id_file"`
  json=`curl "http://209.222.18.222:2000/?client_id=$client_id" 2>/dev/null`
  if [ "$json" == "" ]; then
    json='Port forwarding is already activated on this connection, has expired, or you are not connected to a PIA region that supports port forwarding'
  fi
  echo $json
}
#trim VPN forwarded port from JSON
PORT=$(echo $json | awk 'BEGIN{r=1;FS="{|:|}"} /port/{r=0; print $3} END{exit r}')
#echo $PORT
#change transmission port on the fly
CURLOUT=$(curl -u $TRANSUSER:$TRANSPASS ${TRANSHOST}:9091/transmission/rpc 2>/dev/null)
REGEX='X-Transmission-Session-Id\: (\w*)'

if [[ $CURLOUT =~ $REGEX ]]; then
    SESSIONID=${BASH_REMATCH[1]}
else
    exit 1
fi
DATA='{"method": "session-set", "arguments": { "peer-port" :'$port' } }'

curl -u $TRANSUSER:$TRANSPASS http://${TRANSHOST}:9091/transmission/rpc -d "$DATA" -H "X-Transmission-Session-Id: $SESSIONID"

EXITCODE=0
PROGRAM=`basename $0`
VERSION=2.1
while test $# -gt 0
do
  case $1 in
  --usage | --help | -h )
    usage_and_exit 0
    ;;
  --version | -v )
    version
    exit 0
    ;;
  *)
    error_and_usage "Unrecognized option: $1"
    ;;
  esac
  shift
done
port_forward_assignment
exit 0

脚本取自：https://www.privateinternetaccess.com/forum/discussion/23431/new-pia-port-forwarding-api/p3？

它旨在向他们的 API 发出端口号请求，然后将接收到的端口转发到传输守护进程。

Answer 1

如果你问的是“我如何从该输入数据中获取端口号？"，数据如下：

{"arguments":{},"result":"success"} {"port":37482}

那么我建议你看看jq：

$ echo '{"arguments":{},"result":"success"} {"port":37482}' | jq -s '.[1].port'
37482

---

jq -s将要 ”啜饮“将输入放入数组中，这是必要的，因为您提供了两个不同的对象：

$ echo '{"arguments":{},"result":"success"} {"port":37482}' | jq -s '.'
[
  {
    "arguments": {},
    "result": "success"
  },
  {
    "port": 37482
  }
]

然后必须处理数组的第二个元素（.[1]），然后处理“ port”元素（.[1].port）。

---

作为解决您的一些进一步问题的扩展：

您确实知道 JSON 是什么，您可以在这里获取它，并且可以轻松地打印它、将它重定向到文件等等......

client_id=$(cat "$client_id_file")
curl "http://209.222.18.222:2000/?client_id=$client_id" > EXAMPLE.json

我已经找到了一种提取上述端口号的方法，但如果你不能/不想使用jq，那么python 效果很好，但不幸的是，您的输入似乎不是 JSON，因此我们需要更加努力：

笔记：我们需要将 JSON 作为第一个参数传入，因为脚本是通过 stdin 传入的，所以echo xxx | jq上述方法不能很好地工作。

$ python - <<"EOF" '{"arguments":{},"result":"success"} {"port":37482}'
def read_obj(filename):
    from sys import argv
    from json import JSONDecoder
    decoder = JSONDecoder()
    file_content = argv[1].lstrip()
    while file_content:
        obj, eod = decoder.raw_decode(file_content)
        file_content = file_content[eod:].lstrip()
        yield obj

x = read_obj('x')
obj = next(x) # discard the first object
obj = next(x) # use the second object
print(obj['port'])
EOF

我无法帮助你进行传输接口。

Answer 2

成功了！工作脚本如下：

依赖项： transmission-remote - 您可以通过 optware 安装 transmission-remote-openssl 包。 sha256sum - optware 包 coreutils-sha256sum

#!/usr/bin/env bash
#
# Enable port forwarding when using Private Internet Access
#
# Usage:
#  ./port_forwarding.sh
# script must be run within 2 mins of connecting to vpn server. Do not forget to reconnect/connect
# fill in your transmission username, password and hostname/ip below:

TRANSUSER=xxxxx
TRANSPASS=xxxxx
TRANSHOST=localhost
#now let the script do the work

Sleep 20
echo pausing to wait for vpn to connect and transmission to start

error( )
{
  echo "$@" 1>&2
  exit 1
}

error_and_usage( )
{
  echo "$@" 1>&2
  usage_and_exit 1
}

usage( )
{
  echo "Usage: `dirname $0`/$PROGRAM"
}

usage_and_exit( )
{
  usage
  exit $1
}

version( )
{
  echo "$PROGRAM version $VERSION"
}


port_forward_assignment( )
{
  client_id_file="/etc/openvpn/pia_client_id"
  if [ ! -f "$client_id_file" ]; then
    if hash shasum 2>/dev/null; then
      head -n 100 /dev/urandom | shasum -a 256 | tr -d " -" > "$client_id_file"
    elif hash sha256sum 2>/dev/null; then
      head -n 100 /dev/urandom | sha256sum | tr -d " -" > "$client_id_file"
    else
      echo "Please install shasum or sha256sum, and make sure it is visible in your \$PATH"
      exit 1
    fi
  fi
  client_id=`cat "$client_id_file"`
  json=`curl "http://209.222.18.222:2000/?client_id=$client_id" 2>/dev/null`
  if [ "$json" == "" ]; then
    json='Port forwarding is already activated on this connection, has expired, or you are not connected to a PIA region that supports port forwarding'
  fi

  echo server returned: $json

#trim VPN forwarded port from JSON
PORT=$(echo $json | awk 'BEGIN{r=1;FS="[{}\":]+"} /port/{r=0; print $3} END{exit r}')
echo if successful, trimmed port is:$PORT

#change transmission port on the fly

transmission-remote $TRANSHOST --auth $TRANSUSER:$TRANSPASS -p "$PORT"
echo here are your transmission credentials: host:$TRANSHOST username:$TRANSUSER password:$TRANSPASS
}
echo remember to run no longer than 2 mins after reconnecting/connecting to vpn server.

EXITCODE=0
PROGRAM=`basename $0`
VERSION=2.1

while test $# -gt 0
do
  case $1 in
  --usage | --help | -h )
    usage_and_exit 0
    ;;
  --version | -v )
    version
    exit 0
    ;;
  *)
    error_and_usage "Unrecognized option: $1"
    ;;
  esac
  shift
done

port_forward_assignment

exit 0