Android上的Dropbear隧道段故障

Question

我是一个android开发人员，我们试图在Android设备和Linux之间做一个ssh隧道。我用的是这个解决方案。

以下是我的步骤：

1)我使用0端口通过dbclient连接到我的主机

dbclient -i "$RSA_KEY" -f -N -R 0:localhost:22 "$HOST" -y &> /sdcard/out

2)然后我跑掉了

dropbear -E -R

3)现在，我可以使用公钥和端口in /sdcard/out从主机通过ssh连接设备。

ssh -i ssh_rsa_key root@localhost -p 50216

这是它，它工作得很完美。对于我的解决方案，我需要自动进行隧道操作。

我在/system/bin/ (构建带有脚本的android映像)下创建了bash脚本。在init.rc中添加了相应的服务来自动运行我的脚本。

 service myScript /system/bin/myScript
      class core
      user root
      group root
      disabled

这个脚本实际上每5秒由系统运行一次。但是，当我试图连接到设备时，我会收到以下错误消息：

Aiee, segfault! You should probably report this as a bug to the developer

最奇怪的是，当我手动运行脚本时，它可以正常工作，但是当系统运行相同的脚本时，我会收到上面描述的错误消息。

"dmesg“、"logcat"，甚至"ssh . -vvv”都不会给出任何错误消息。

我认为问题在于"dropbear“本身，因为当系统运行"dbclient”，然后手动运行“-E -R”时，隧道工作正常。

这是我输出的"ssh . -v“

  OpenSSH_7.6p1, LibreSSL 2.6.2
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 48: Applying options for *
  debug1: Connecting to localhost port 50643.
  debug1: Connection established.
  debug1: key_load_public: No such file or directory
  debug1: identity file ssh_rsa_key_to_box type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file ssh_rsa_key_to_box-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_7.6
  debug1: Remote protocol version 2.0, remote software version dropbear_2017.75
  debug1: no match: dropbear_2017.75
  debug1: Authenticating to localhost:50643 as 'root'
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: algorithm: curve25519-sha256@libssh.org
  debug1: kex: host key algorithm: ssh-rsa
  debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
  debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
  debug1: Server host key: ssh-rsa SHA256:M1PmvueMNfm4q47UlzVWZMdB6YzxyYBy4I5hden9ctU
  debug1: Host '[localhost]:50643' is known and matches the RSA host key.
  debug1: Found key in /Users/haykbeglaryan/.ssh/known_hosts:23
  debug1: rekey after 4294967296 blocks
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: rekey after 4294967296 blocks
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug1: Authentications that can continue: publickey
  debug1: Next authentication method: publickey
  debug1: Trying private key: ssh_rsa_key_to_box
  debug1: Authentication succeeded (publickey).
  Authenticated to localhost ([::1]:50643).
  debug1: channel 0: new [client-session]
  debug1: Entering interactive session.
  debug1: pledge: network
  debug1: Sending environment.
  debug1: Sending env LC_CTYPE = UTF-8
  debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
  Aiee, segfault! You should probably report this as a bug to the developer
  debug1: channel 0: free: client-session, nchannels 1
  debug1: fd 1 clearing O_NONBLOCK
  Connection to localhost closed.
  Transferred: sent 2640, received 1816 bytes, in 0.0 seconds
  Bytes per second: sent 312354.4, received 214861.9
  debug1: Exit status 1

Answer 1

问题是在环境变量“LD_LIBRARY_PATH”中使用的。当我打印的时候

$ echo $LD_LIBRARY_PATH
/vendor/lib:/system/lib

但是当init.rc试图读取它时，它是空的。我只是在dropbear中对这一行进行了处理，现在它已经正确地工作了。