问题
I have an expect script like this
#!/usr/bin/expect -f
set timeout 30
log_user 0
set PASSWORD $::env(PASSWORD)
set USERNAME $::env(USERNAME)
set TOKEN $::env(TOKEN)
puts stderr "Generating OTP"
spawn oathtool --totp $TOKEN
expect -re \\d+
set otp $expect_out(0,string)
puts stderr "Connecting to VPN server"
spawn -ignore HUP env openconnect -b https://vpn
expect "GROUP:"
send "Tech\n"
expect "Username:"
send "$USERNAME\n"
expect "Password:"
send "$PASSWORD\n"
expect "Password:"
send "$otp\n"
expect EOF
This simple script provides user and password to openconnect to make a new VPN connection in background, but it wont work because the children spawned processes are killed by expect. As you may know, expect will send SIGHUP signal before finish, I was trying to workaround it but even when I put the -ignore HUP flag, it is killing the underlying process, I would like to end my script but the underlying openconnect in background survive.
Do you know what is lacking here?
Take into account that openconnect -b will spawn other PID by its own.
回答1:
The following method using 2 batch files worked for me:
The -b flag in openconnect is not used and kill command is used instead to send openconnect to background.
contents of file named vpn2:
#!/usr/bin/expect -f
set timeout -1
spawn -ignore HUP -noecho /root/bin/v2vpn2
expect "password"
sleep 3
send -- "my_password\r"
expect "SMS OTP"
interact
expect "Established"
expect eof
contents of file named v2vpn2:
rm /var/log/vpn2.log > /dev/null 2>&1
touch /var/log/vpn2.log
# the word password is printed twice and so filtering here
tail -f /var/log/vpn2.log | grep -m2 -wo "password" | sed '2q;d' &
tail -f /var/log/vpn2.log | grep --color=never -wo "SMS OTP" &
while /bin/true; do
grep -q "Established" /var/log/vpn2.log
if (( $? == 0 )); then
kill -STOP `pgrep openconnect`
kill -CONT `pgrep openconnect`
pkill vpn2
exit
fi
done &
openconnect -u "my_user_name" my_vpn_url >> /var/log/vpn2.log 2>&1
回答2:
After spending too much time on this, I solved it by adding
expect -timeout -1 -ex "Client killed"
and calling script with &
./vpn.exp &
来源:https://stackoverflow.com/questions/45578588/tcl-expect-kills-child-of-child-process