Class: Bandshell::WirelessConnection

Inherits:
Object
  • Object
show all
Defined in:
lib/bandshell/netconfig.rb

Overview

802.11* unencrypted wireless connections. These are managed by wpa_supplicant on Debian so we need to create its configuration file and link it to the interfaces file.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ WirelessConnection

Returns a new instance of WirelessConnection.



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# File 'lib/bandshell/netconfig.rb', line 243

def initialize(args={})
  @ssid = args['ssid'] || ''
  @interface_name = args['interface_name'] if args['interface_name']
  @wpa_config_file = '/tmp/wpa_supplicant.concerto.conf'
end

Instance Attribute Details

#interface_name ⇒ Object

Returns the value of attribute interface_name.



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# File 'lib/bandshell/netconfig.rb', line 249

def interface_name
  @interface_name
end

#ssid ⇒ Object

Returns the value of attribute ssid.



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# File 'lib/bandshell/netconfig.rb', line 249

def ssid
  @ssid
end

Class Method Details

.description ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 298

def self.description
  "Wireless connection (no encryption)"
end

.interfaces ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 302

def self.interfaces
  # Again this is not guaranteed to be a catch all.
  devices = Dir.glob('/sys/class/net/{ath,wlan}*')
  devices.map { |d| Interface.new(File.basename(d)) }
end

Instance Method Details

#args ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 291

def args
  {
    'interface_name' => @interface_name,
    'ssid' => @ssid
  }
end

#config_interface_name ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 251

def config_interface_name
  # If the user has requested a specific interface, use it.
  # Otherwise, just pick the first wlan interface, assuming
  # it works and all wlan interfaces have approximately equal
  # reception. When this assumption is wrong the user must force.
  if @interface_name && @interface_name != ''
    @interface_name
  else
    self.class.interfaces[0].name
  end
end

#interfaces_lines ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 286

def interfaces_lines
  # This links the wpa config to the interfaces file.
  ["wpa-conf #{@wpa_config_file}"]
end

#safe_assign ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 269

def safe_assign
  [ :ssid, :interface_name ]
end

#validate ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 263

def validate
  if @ssid == ''
    fail "Need SSID for wireless connection"
  end
end

#write_configs ⇒ Object 



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# File 'lib/bandshell/netconfig.rb', line 273

def write_configs
  # Write a wpa_supplicant.conf file for an unsecured network.
  File.open(@wpa_config_file, 'w') do |wpaconf|
    # long lines, sorry!
    wpaconf.puts "ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev"
    wpaconf.puts "network={"
    wpaconf.puts "ssid=\"#{@ssid}\""
    wpaconf.puts "scan_ssid=1"
    wpaconf.puts "key_mgmt=NONE"
    wpaconf.puts "}"
  end
end