Tool 176: TFTP client : get a file and check its MD5
  
  Description:
   
  This tool downloads a TFTP file and check its MD5.
  It ensures the server is working properly.
  
  Parameter --md5 is the expected md5sum.
  Parameter --dst-ip is the address of remote host/server.
  Parameter --dst-port is the port number where to connect.
  Optional parameter --src-ip defines the local IP address to use.
  Optional parameter --src-port defines the local port number to use.
  Optional parameter --ip4opts permits to add IP4 options encoded as
  mixed.
  Optional parameter --ip6exts permits to add IP6 options encoded as
  mixed (first byte is the next header number).
  Optional parameters --device, --src-eth and --dst-eth permits to
  create a virtual client using fake addresses (in this case, tool have
  to be run with admin privilege in order to sniff and spoof at
  Ethernet level).
   
  Usage:
    netwox 176 -i ip -F file -s md5 [-d device] [-E eth] [-e eth] [-I ip] [-P port] [-p port] [-o ip4opts] [-O ip6exts] [-m data] [-T uint32] [-R uint32]
  Parameters:
 
  | parameter | description | example | 
 | -i|--dst-ip ip | destination IP address | 5.6.7.8 | 
| -F|--remote-file file | remote file | /etc/passwd | 
| -s|--md5 md5 | wanted md5 | 12345678901234567890123456789012 | 
| -d|--device device | device name | Eth0 | 
| -E|--src-eth eth | source ethernet address | 0:2:3:4:5:6 | 
| -e|--dst-eth eth | destination ethernet address | 0:8:9:a:b:c | 
| -I|--src-ip ip | source IP address | 192.168.100.200 | 
| -P|--src-port port | source port number | 0 | 
| -p|--dst-port port | destination port number | 69 | 
| -o|--ip4opts ip4opts | IPv4 options |  | 
| -O|--ip6exts ip6exts | IPv6 extensions |  | 
| -m|--mode data | mode (octet or netascii) | octet | 
| -T|--timeout uint32 | timeout in milliseconds | 60000 | 
| -R|--retry uint32 | number of retry | 3 | 
  Examples:
    netwox 176 -i "5.6.7.8" -F "/etc/passwd" -s "12345678901234567890123456789012"
    netwox 176 --dst-ip "5.6.7.8" --remote-file "/etc/passwd" --md5 "12345678901234567890123456789012"