Shell implementation SSH Automatic login server script

The

SSH connection to a remote host will ask for a password, like the default behavior of the SU, sudo command, is not read from stdin, the legend is for security considerations, but sometimes in the script does require an unattended landing.
Search for a similar example, using expect to complete the password answer:

code is as follows	copy code
#!/bin/bash Auto_login_ssh () {     expect-c" Set Timeou t-1;                 Spawn-noecho ssh- o Stricthostkeychecking=no $ ${@:3};                 Expect *assword:* ;                 send-$1r;                 interact; "; }   auto_login_ssh password user@host Stricthostkeychecking=no

parameter allows SSH to default to add the new host's public key fingerprint, there will be no indication of whether to continue yes/no.

The above expect code basically can meet the requirement, can realize automatic login

Automatic SSH/SCP Scripts

If you need to from a, to B, and then to C, then need SSH and SCP two times, is more troublesome.
SSH Automatic Login:

The code is as follows

Copy Code

#!/usr/bin/expect-f Set Timeout 30 Spawn ssh Weiqiong@b Expect "Password:" Send "PPPPPPR" Expect "]*" Send "SSH weiqiong@cr" Expect "Password:" Send "PPPPPPR" Interact SCP copies files from a to C: #!/usr/bin/expect-f Set Timeout 300 Set file [lindex $argv 0] Spawn SCP $file Weiqiong@b:/home/weiqiong Expect "Password:" Send "PPPPPPR" Expect "]*" Spawn ssh Weiqiong@b Expect "Password:" Send "PPPPPPR" Expect "]*" Send "SCP $file weiqiong@c:/home/weiqiongr" Expect "Password:" Send "PPPPPPR" Expect "]*" Exit Interact SCP copies files from C to a: #!/usr/bin/expect-f Set Timeout 300 Set file [lindex $argv 0] Spawn ssh Weiqiong@b Expect "Password:" Send "PPPPPPR" Expect "]*" Send "SCP weiqiong@c:/home/weiqiong/$file. R" Expect "Password:" Send "PPPPPPR" Expect "]*" Send "Exitr" Expect "]*" Spawn SCP weiqiong@b:/home/weiqiong/$file. Expect "Password:" Send "PPPPPPR" Interact

4. Establishment of SSH/SCP Channel

For example, my machine is a, intermediate server is B, target server is C
From a can ssh to B, from B can ssh to C, but a cannot ssh directly to C
Now demonstrates using SSH channel technology to transfer files directly from A to C

The code is as follows	Copy Code
1. Ssh-l1234:c:22 userid@b Input B ' s password

(1234 is a free port for native A, which requires root user rights on machine A, and actually establishes a channel on the native 1234 port)

2. Open a new console and type:

The code is as follows	Copy Code
scp-p1234 filename Userid@localhost: Input C ' s password

If it is just daily use, in order to avoid the trouble of frequently entering the host password, the most ideal method is to produce the local public/private key pair, the fingerprint is copied directly to the remote host, the newer OpenSSH provides the Ssh-copy-id tool:

The code is as follows	Copy Code
Ssh-keygen Ssh-copy-id User@host1 Ssh-copy-id User@host2 Ssh-copy-id User@host3

Run Ssh-keygen will ask a few questions, all return by default is the effect we want, respectively, the key distribution to the remote host, after the implementation of SSH user@host, or SCP, are directly completed.

If you need to remove the remote machine corresponding to the local account key, login to the account, open the ~/.ssh/authorized_keys file, search your username, delete the line, save, you can.

Of course it can be automated:

The code is as follows	Copy Code
Auto_ssh_copy_ ID () {     expect-c "set timeout-1;                 Spawn Ssh-copy-id $;                 Expect {                      * (yes/no) * {send-yesr;exp_continue;}                      *assword:* {send-$1r;exp_continue;}                      eof        {exit 0;}                } "; }