使用sed编辑milter-greylist配置文件

Question

Virtualmin支持手动配置电子邮件速率限制的域名。我想创建一个脚本，以自动添加到milter-greylist的域名，并定义其速率限制每小时自动。

当域(example.com)设置为每小时500封电子邮件的速率限制时，它会在/etc/milter-greylist/greylist.conf中添加以下三行

ratelimit "domain_14014450697382" rcpt 500 / 1h
racl blacklist from /.*@example.com/ ratelimit "domain_14014450697382" msg "Message quota exceeded"
racl whitelist from /.*@example.com`

这三行代码被插入到racl whitelist default之上。域名后的数字串即为域名ID，可通过执行以下命令找到：

virtualmin list-domains --domain $VIRTUALSERVER_DOM --id-only

我尝试在创建服务器时插入这三行，并在删除服务器时删除这三行。我有相当基本的脚本编写技能，并想出了：

#!/bin/bash

# script is executed when changes are made to server

## Add new domain to milter-greylist for rate limiting
if [ "$VIRTUALSERVER_ACTION" = "CREATE_DOMAIN" ]; then
ID=$(virtualmin list-domains --domain $VIRTUALSERVER_DOM --id-only) &&
sed -i '/racl whitelist default/ a\ratelimit "domain_"$ID rcpt 500 / 1h\n
racl blacklist from /.*@$VIRTUALSERVER_DOM/ ratelimit "domain_"$ID msg "Message quota exceeded"\n
racl whitelist from /.*@$VIRTUALSERVER_DOM/\n' /etc/milter-greylist/greylist.conf 
fi

## Remove domain from milter-greylist on domain deletion
if [ "$VIRTUALSERVER_ACTION" = "DELETE_DOMAIN" ]; then
ID=$(virtualmin list-domains --domain $VIRTUALSERVER_DOM --id-only) &&
sed -i '/$ID/d' /etc/milter-greylist/greylist.conf &&
sed -i '/$VIRTUALSERVER_DOM/d' /etc/milter-greylist/greylist.conf
fi

这会导致：

racl whitelist default
ratelimit "domain_"$ID rcpt 500 / 1h

ratelimit "domain_"$ID rcpt 500 / 1h

/etc/milter-greylisting/greylisting.conf

有人能建议我需要修复什么吗？

Answer 1

您在sed表达式中使用了'引号，因此不会发生bash扩展。下面的脚本应该可以工作。

## Add new domain to milter-greylist for rate limiting
if [ "$VIRTUALSERVER_ACTION" = "CREATE_DOMAIN" ]; then
  ID=$(virtualmin list-domains --domain $VIRTUALSERVER_DOM --id-only)
  sed -i "/racl whitelist default/i \ratelimit \"domain_$ID\" rcpt 500 / 1h\nracl blacklist from /.*@$VIRTUALSERVER_DOM/ ratelimit \"domain_$ID\" msg \"Message quota exceeded\"\nracl whitelist from /.*@$VIRTUALSERVER_DOM/\n" /etc/milter-greylist/greylist.conf 
fi

## Remove domain from milter-greylist on domain deletion
if [ "$VIRTUALSERVER_ACTION" = "DELETE_DOMAIN" ]; then
  ID=$(virtualmin list-domains --domain $VIRTUALSERVER_DOM --id-only)
  sed -i "/$ID/d" /etc/milter-greylist/greylist.conf
  sed -i "/$VIRTUALSERVER_DOM/d" /etc/milter-greylist/greylist.conf
fi

已在GNU sed version 4.2.1中测试。希望这能有所帮助。