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Managing WiFi networks - Discovering networks

Ditulis Oleh Muh Aslan on Monday, 21 November 2016 | 7:49:00 am

You can use this library to scan for networks that are available in the air. To get a list of the different cells in the area, you can do
>>> from wifi import Cell, Scheme
>>> Cell.all('wlan0')
This returns a list of Cell objects. Under the hood, this calls iwlist scan and parses the unfriendly output.
Each cell object should have the following attributes:
  • ssid
  • signal
  • quality
  • frequency
  • bitrates
  • encrypted
  • channel
  • address
  • mode
For cells that have encrypted as True, there will also be the following attributes:
  • encryption_type
Scanning requires root permission to see all the networks. If you are not root, iwlist only returns the network you are currently connected to.

Connecting to a network

In order to connect to a network, you need to set up a scheme for it.
>>> cell = Cell.all('wlan0')[0]
>>> scheme = Scheme.for_cell('wlan0', 'home', cell, passkey)
>>> scheme.activate()

Once you have a scheme saved, you can retrieve it using Scheme.find().
>>> scheme = Scheme.find('wlan0', 'home')
>>> scheme.activate()

Activating a scheme will disconnect from any other scheme before connecting.
You must be root to connect to a network. Wifi uses ifdown and ifup to connect and disconnect.
class wifi.Cell
Presents a Python interface to the output of iwlist.
classmethod all(interface)
Returns a list of all cells extracted from the output of iwlist.
classmethod from_string(cell_string)
Parses the output of iwlist scan for one cell and returns a Cell object for it.
classmethod where(interface, fn)
Runs a filter over the output of all() and the returns a list of cells that match that filter.
class wifi.Scheme(interface, name, options=None)
Saved configuration for connecting to a wireless network. This class provides a Python interface to the /etc/network/interfaces file.
Connects to the network as configured in this scheme.
classmethod all()
Returns an generator of saved schemes.
Deletes the configuration from the interfaces file.
classmethod find(interface, name)
Returns a Scheme or None based on interface and name.
classmethod for_cell(interface, name, cell, passkey=None)
Intuits the configuration needed for a specific Cell and creates a Scheme for it.
classmethod for_file(interfaces)
A class factory for providing a nice way to specify the interfaces file that you want to use. Use this instead of directly overwriting the interfaces Class attribute if you care about thread safety.
Writes the configuration to the interfaces file.

you can download 
A fork of the python wifi module implementing support for WPA-Enterprise modes.

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