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在 OS X CLI 上使用 telnet 和 FTP 自动发送电子邮件

tag-icon • tag-icon macos command-line email smtp telnet
在 OS X CLI 上使用 telnet 和 FTP 自动发送电子邮件

运行以下脚本：

#!/bin/bash

cvs_domain=abc.com
cvs_mail_server=mail.${cvs_domain}
cvs_port=25
telnet $cvs_mail_server $cvs_port<<_EOF_
EHLO $cvs_domain
MAIL FROM:[email protected]
RCPT TO:[email protected]
DATA
Subject:Test!

Don't panic. This is only a test.
.
QUIT
_EOF_

Connection closed by host在服务器用转义字符回复之后、发送消息之前，出现一条消息失败220。

以交互模式运行相应的序列（当然，没有“here-doc”）就实现了我的目标。

我怀疑将命令行“馈送”到服务器的过程并没有完全按照线路另一端的预期进行。

我的假设正确吗？ 有没有办法缓解这个问题？

答案1

当您需要编写一个交互式命令行工具脚本时，典型的解决方案是使用expect(1)。

答案2

为了完整起见，我在这里发布了完整的“丑陋但有效”的解决方案（修改后的最终形式是，它会向更多人发送电子邮件，并提供附件）：

cd "$(dirname "$0")"
working_dir=$(pwd)  # switching to the folder this script has been started from

cvs_domain=mail.org
cvs_mail_server=mail.${cvs_domain}
cvs_port=25
[email protected]
cvs_recipients=([email protected] [email protected])
cvs_delimiter=-----nEXt_paRt_frontier!!VSFCDVGGERHERZZ@$%^zzz---  # MIME multi-part delimiter, do not change

{ echo HELO $cvs_domain; sleep 1
  # set up the email (sender, receivers): 
  echo MAIL FROM:$cvs_sender; sleep 1
  for r in ${cvs_recipients[@]}; do
    echo RCPT TO:$r; sleep 1
  done
  echo DATA; sleep 1
  echo From:$cvs_sender; sleep 1
  for r in ${cvs_recipients[@]}; do
    echo To:$r; sleep 1
  done
  echo Subject:Test for build; sleep 1
  # build the mail structure, according to the MIME standard:
  echo MIME-Version: 1.0; sleep 1
  echo "Content-Type: multipart/mixed; boundary=\"$cvs_delimiter\""; sleep 1
  echo --${cvs_delimiter}; sleep 1
  echo Content-Type: text/plain; sleep 1
  echo; sleep 1
  echo Don\'t panic. This is only a test.; sleep 1
  echo; sleep 1
  echo --${cvs_delimiter}; sleep 1
  echo "Content-Type: text/plain; name=\"test.txt\""; sleep 1
  echo "Content-Disposition: attachment; filename=\"test.txt\""; sleep 1
  echo "Content-Transfer-Encoding: base64"; sleep 1
  echo; sleep 1
  encoded_file=$( base64 ./change.log )  # encoding the contents of the file, according to the declaration above
  echo "$encoded_file"; sleep 1
  echo; sleep 1  
  echo --${cvs_delimiter}; sleep 1 
  echo .; sleep 1
  echo QUIT
  sleep 1; } | telnet $cvs_mail_server $cvs_port

有人可能会选择摆弄延迟。而对于（我认为可能是）更强大的解决方案，我会选择expect(1)。

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