new startegy of renewing connection

src/ssh-backdoor

@@ -350,9 +350,9 @@ if __name__ == "__main__":
             "    Connected\r"
         )
         while True:
-            # Run 1 hour, then exit to reconnect
-            if time.time() - start_time > 3600:
-                sys.exit(0)
+            #~ # Run 1 hour, then exit to reconnect
+            #~ if time.time() - start_time > 3600:
+                #~ sys.exit(0)
             db.check_die()
             db.update(opts.id)
             for i in range(10):

src/ssh-backdoor-open

@@ -13,8 +13,8 @@ if [[ "$1" = update ]]; then
 fi
 
 _ssh() {
-  trap 'kill -INT -$sshpid; exit;' INT
-  timeout -k 10 3700 ssh \
+  trap 'kill -INT -$SSHPID; exit;' INT
+  ssh \
        -o UserKnownHostsFile=/dev/null \
        -o StrictHostKeyChecking=no \
        -o ConnectTimeout=10 \
@@ -23,14 +23,14 @@ _ssh() {
        -p ${BACKDOORPORT} \
        ${BACKDOORHOST} \
        "$@" &
-  sshpid=$!
-  wait $sshpid
-       #~ -o "ExitOnForwardFailure yes" \
+  SSHPID=$!
+  wait $SSHPID
 }
 
 BACKDOORHOST={{BACKDOORHOST}}
 BACKDOORPORT={{BACKDOORPORT}}
 USER=$( id -u -n )
+BGPID=0
 echo "Must use ssh agent (ssh-add)"
 while true; do
     port=$( _ssh bin/ssh-backdoor open $USER@$HOSTNAME )
@@ -38,12 +38,18 @@ while true; do
     echo "$port port assigned"
     #~ _ssh pkill -a -f $USER@$HOSTNAME
     _ssh \
+       -L $port:localhost:$port \
        -R $port:localhost:22 \
-       bin/ssh-backdoor keep $USER@$HOSTNAME || {
-      true
-         # failed
-      #_ssh bin/ssh-kill $USER@$HOSTNAME $port || true
-    }
+       bin/ssh-backdoor keep $USER@$HOSTNAME &
+    BGPID=$!
+    while true; do
+      sleep 60
+      timeout 20 ssh-keyscan -p "$port" localhost 2>/dev/null | grep -q "$port" || {
+        kill $BGPID
+        break
+      }
+    done
+
     for i in {1..10}; do
        sleep 1
        printf "      $i\r"