#!/usr/bin/python3
'''

make sure pexpect is installed:
$ sudo yum install python3-pexpect

You might need to install pexpect-serial using pip:
$ pip3 install serial
$ pip3 install pexpect-serial

./openwrt_ctl.py -l stdout -u root -p TIP -s serial --tty ttyUSB0

# Set up reverse ssh tunnel
./openwrt_ctl.py --tty /dev/ttyAP1 --action ssh-tunnel \
        --value "ssh -y -y -f -N -T -M -R 9999:localhost:22 lanforge@10.28.3.100" \
        --value2 password-for-10.28.3.100 --log stdout --scheme serial --prompt root@Open
'''

import sys

if sys.version_info[0] != 3:
    print("This script requires Python 3")
    exit()

import re
import logging
import time
from time import sleep
import pprint
import telnetlib
import argparse
import pexpect

default_host = "localhost"
default_ports = {
    "serial": None,
    "ssh": 22,
    "telnet": 23
}
NL = "\n"
CR = "\r\n"
Q = '"'
A = "'"
FORMAT = '%(asctime)s %(name)s %(levelname)s: %(message)s'
prompt = "root@OpenWrt:"


def usage():
    print("$0 used connect to OpenWrt AP or similar Linux machine:")
    print("-d|--dest  IP address of the OpenWrt AP, for ssh/telnet scheme")
    print("-o|--port  IP port of the OpenWrt AP, for ssh/telnet scheme")
    print("-t|--tty   Serial port, if using serial scheme")
    print("-u|--user  login name")
    print("-p|--pass  password")
    print("--prompt   Prompt to look for when commands are done (default: root@OpenWrt)")
    print("-s|--scheme (serial|telnet|ssh): connect via serial, ssh or telnet")
    print("-l|--log file log messages here")
    print("--action (logread | journalctl | lurk | sysupgrade | download | upload | reboot | cmd | ssh-tunnel")
    print("--value (option to help complete the action")
    print("--value2 (option to help complete the action, dest filename for download, passwd for ssh-tunnel")
    print("-h|--help")


# see https://stackoverflow.com/a/13306095/11014343
class FileAdapter(object):
    def __init__(self, logger):
        self.logger = logger

    def write(self, data):
        # NOTE: data can be a partial line, multiple lines
        data = data.strip()  # ignore leading/trailing whitespace
        if data:  # non-blank
            self.logger.info(data)

    def flush(self):
        pass  # leave it to logging to flush properly


def main():
    global prompt

    parser = argparse.ArgumentParser(description="OpenWrt AP Control Script")
    parser.add_argument("-d", "--dest", type=str, help="address of the cisco controller_tests")
    parser.add_argument("-o", "--port", type=int, help="control port on the controller_tests")
    parser.add_argument("-u", "--user", type=str, help="credential login/username")
    parser.add_argument("-p", "--passwd", type=str, help="credential password")
    parser.add_argument("-P", "--prompt", type=str, help="Prompt to look for")
    parser.add_argument("-s", "--scheme", type=str, choices=["serial", "ssh", "telnet"],
                        help="Connect via serial, ssh or telnet")
    parser.add_argument("-t", "--tty", type=str, help="tty serial device")
    parser.add_argument("-l", "--log", type=str, help="logfile for messages, stdout means output to console")
    parser.add_argument("--action", type=str, help="perform action",
                        choices=["logread", "journalctl", "lurk", "sysupgrade", "sysupgrade-n", "download", "upload",
                                 "reboot", "cmd", "ssh-tunnel"])
    parser.add_argument("--value", type=str, help="set value")
    parser.add_argument("--value2", type=str, help="set value2")
    tty = None

    args = None
    try:
        args = parser.parse_args()
        host = args.dest
        scheme = args.scheme
        port = args.port
        # port = (default_ports[scheme], args.port)[args.port != None]
        user = args.user
        passwd = args.passwd
        logfile = args.log
        tty = args.tty;
        if (args.prompt != None):
            prompt = args.prompt
        filehandler = None
    except Exception as e:
        logging.exception(e);
        usage()
        exit(2);

    console_handler = logging.StreamHandler()
    formatter = logging.Formatter(FORMAT)
    logg = logging.getLogger(__name__)
    logg.setLevel(logging.DEBUG)
    file_handler = None
    if (logfile is not None):
        if (logfile != "stdout"):
            file_handler = logging.FileHandler(logfile, "w")
            file_handler.setLevel(logging.DEBUG)
            file_handler.setFormatter(formatter)
            logg.addHandler(file_handler)
            logging.basicConfig(format=FORMAT, handlers=[file_handler])
        else:
            # stdout logging
            logging.basicConfig(format=FORMAT, handlers=[console_handler])

    CCPROMPT = prompt

    ser = None
    egg = None  # think "eggpect"
    try:
        if (scheme == "serial"):
            # eggspect = pexpect.fdpexpect.fdspan(telcon, logfile=sys.stdout.buffer)
            import serial
            from pexpect_serial import SerialSpawn
            ser = serial.Serial(tty, 115200, timeout=5)

            egg = SerialSpawn(ser);
            egg.logfile = FileAdapter(logg)
            egg.sendline(NL)
            has_reset = False
            try:
                logg.info("prompt: %s user: %s  passwd: %s" % (prompt, user, passwd))
                while True:
                    i = egg.expect([prompt, "Please press Enter to activate", "login:", "Password:", "IPQ6018#"],
                                   timeout=3)
                    logg.info("expect-0: %i" % (i))
                    if (i == 0):
                        logg.info("Found prompt, login complete.")
                        break
                    if (i == 1):
                        logg.info("Sending newline")
                        egg.setdline(NL)
                    if (i == 2):
                        logg.info("Sending username: %s" % (user))
                        egg.sendline(user)
                    if (i == 3):
                        logg.info("Sending password: %s" % (passwd))
                        egg.sendline(passwd)
                    if (i == 4):  # in bootloader
                        if has_reset:
                            logg.info("ERROR:  Have reset once already, back in bootloader?")
                            sys.exit(1)
                        has_reset = True
                        logg.info("In boot loader, will reset and sleep 30 seconds")
                        egg.sendline("reset")
                        time.sleep(30)
                        egg.sendline(NL)

            except Exception as e:
                # maybe something like 'logread -f' is running?
                # send ctrl-c
                egg.send(chr(3))

        elif (scheme == "ssh"):
            # Not implemented/tested currently. --Ben
            if (port is None):
                port = 22
            cmd = "ssh -p%d %s@%s" % (port, user, host)
            logg.info("Spawn: " + cmd + NL)
            egg = pexpect.spawn(cmd)
            # egg.logfile_read = sys.stdout.buffer
            egg.logfile = FileAdapter(logg)
            i = egg.expect(["password:", "continue connecting (yes/no)?"], timeout=3)
            time.sleep(0.1)
            if i == 1:
                egg.sendline('yes')
                egg.expect('password:')
            sleep(0.1)
            egg.sendline(passwd)

        elif (scheme == "telnet"):
            # Not implemented/tested currently. --Ben
            if (port is None):
                port = 23
            cmd = "telnet %s %d" % (host, port)
            logg.info("Spawn: " + cmd + NL)
            egg = pexpect.spawn(cmd)
            egg.logfile = FileAdapter(logg)
            time.sleep(0.1)
            egg.sendline(' ')
            egg.expect('User\:')
            egg.sendline(user)
            egg.expect('Password\:')
            egg.sendline(passwd)
            egg.sendline('config paging disable')
        else:
            usage()
            exit(1)
    except Exception as e:
        logging.exception(e);

    command = None

    CLOSEDBYREMOTE = "closed by remote host."
    CLOSEDCX = "Connection to .* closed."

    try:
        egg.expect(CCPROMPT)
    except Exception as e:
        egg.sendline(NL)

    TO = 10
    wait_forever = False

    # Clean pending output
    egg.sendline("echo __hello__")
    egg.expect("__hello__")
    egg.expect(CCPROMPT)

    logg.info("Action[%s] Value[%s] Value2[%s]" % (args.action, args.value, args.value2))

    if (args.action == "reboot"):
        command = "reboot"
        TO = 60

    if (args.action == "cmd"):
        if (args.value is None):
            raise Exception("cmd requires value to be set.")
        command = "%s" % (args.value)

    if (args.action == "logread"):
        command = "logread -f"
        TO = 1
        wait_forever = True

    if (args.action == "journalctl"):
        command = "journalctl -f"
        TO = 1
        wait_forever = True

    if (args.action == "lurk"):
        command = "date"
        TO = 1
        wait_forever = True

    if (args.action == "ssh-tunnel"):
        command = "%s" % (args.value)
        passwd = "%s" % (args.value2)
        logg.info("Command[%s]" % command)
        egg.sendline(command);

        i = egg.expect(["password:", "Do you want to continue connecting"], timeout=5)
        if i == 1:
            egg.sendline("y")
            egg.expect("password:", timeout=5)
        egg.sendline(passwd)
        egg.expect(CCPROMPT, timeout=20)
        return

    if ((args.action == "sysupgrade") or (args.action == "sysupgrade-n")):
        command = "scp %s /tmp/new_img.bin" % (args.value)
        logg.info("Command[%s]" % command)
        egg.sendline(command);

        i = egg.expect(["password:", "Do you want to continue connecting"], timeout=5)
        if i == 1:
            egg.sendline("y")
            egg.expect("password:", timeout=5)
        egg.sendline("lanforge")
        egg.expect(CCPROMPT, timeout=20)
        if (args.action == "sysupgrade-n"):
            egg.sendline("sysupgrade -n /tmp/new_img.bin")
        else:
            egg.sendline("sysupgrade /tmp/new_img.bin")
        egg.expect("link becomes ready", timeout=100)
        return

    if (args.action == "download"):
        command = "scp %s /tmp/%s" % (args.value, args.value2)
        logg.info("Command[%s]" % command)
        egg.sendline(command);

        i = egg.expect(["password:", "Do you want to continue connecting", "Network unreachable"], timeout=5)
        if i == 2:
            print("Network unreachable, wait 15 seconds and try again.")
            time.sleep(15)
            command = "scp %s /tmp/%s" % (args.value, args.value2)
            logg.info("Command[%s]" % command)
            egg.sendline(command);

            i = egg.expect(["password:", "Do you want to continue connecting", "Network unreachable"], timeout=5)
        if i == 2:
            print("ERROR:  Could not connect to LANforge to get download file")
            exit(2)
        if i == 1:
            egg.sendline("y")
            egg.expect("password:", timeout=5)
        egg.sendline("lanforge")
        egg.expect(CCPROMPT, timeout=20)
        return

    if (args.action == "upload"):
        command = "scp %s %s" % (args.value, args.value2)
        logg.info("Command[%s]" % command)
        egg.sendline(command);

        i = egg.expect(["password:", "Do you want to continue connecting", "Network unreachable"], timeout=5)
        if i == 2:
            print("Network unreachable, wait 15 seconds and try again.")
            time.sleep(15)
            command = "scp /tmp/%s %s" % (args.value, args.value2)
            logg.info("Command[%s]" % command)
            egg.sendline(command);

            i = egg.expect(["password:", "Do you want to continue connecting", "Network unreachable"], timeout=5)
        if i == 2:
            print("ERROR:  Could not connect to LANforge to put upload file")
            exit(2)
        if i == 1:
            egg.sendline("y")
            egg.expect("password:", timeout=5)
        egg.sendline("lanforge")
        egg.expect(CCPROMPT, timeout=20)
        return

    if (command is None):
        logg.info("No command specified, going to log out.")
    else:
        logg.info("Command[%s]" % command)
        egg.sendline(command);
        while True:
            try:
                i = egg.expect([CCPROMPT, "kmodloader: done loading kernel", "\n"], timeout=TO)
                print(egg.before.decode('utf-8', 'ignore'))
                if i == 1:
                    egg.sendline(' ')
                    egg.expect(CCPROMPT, timeout=20)
                    print(egg.before.decode('utf-8', 'ignore'))
                if i == 2:  # new line of text, just print and continue
                    continue

                if not wait_forever:
                    break

            except Exception as e:
                # Some commands take a long time (logread -f)
                if not wait_forever:
                    logging.exception(e)
                    break


# ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
if __name__ == '__main__':
    main()

####
####
####
