以编程方式使用Ruby和ioctl获取wifi BSSID
问题描述:
使用Getting essid via ioctl in ruby作为模板我想获取BSSID而不是ESSID。但是,不是C开发人员,有一些我不明白的东西。以编程方式使用Ruby和ioctl获取wifi BSSID
我有什么到目前为止这确实不工作:(...
注意我有点困惑,因为我的一部分认为,根据wireless.h一些意见,认为BSSID只能是设置通过ioctl。然而,从ioctl到得到存在。随着我几乎完全不了解更多的中间C型(结构,工会和东西;)),我只是不知道不知道。
def _get_bssid(interface)
# Copied from wireless.h
# supposing a 16 byte address and 32 byte buffer but I'm totally
# guessing here.
iwreq = [interface, '' * 48,0].pack('a*pI')
sock = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM, 0)
# from wireless.h
# SIOCGIWAP 0x8B15 /* get access point MAC addresses */
sock.ioctl('0x8B15', iwreq) # always get an error: Can't convert string to Integer
puts iwreq.inspect
end
所以,在此之前,我使用的是wpa_cli方法抓住BSSID,但我宁愿使用IOCTL:
def _wpa_status(interface)
wpa_data = nil
unless interface.nil?
# need to write a method to get the src_sock_path
# programmatically. Fortunately, for me
# this is going to be the correct sock path 99% of the time.
# Ideas to get programmatically would be:
# parse wpa_supplicant.conf
# check process table | grep wpa_suppl | parse arguments
src_sock_path = '/var/run/wpa_supplicant/' + interface
else
return nil
end
client_sock_path = '/var/run/hwinfo_wpa'
# open Domain socket
socket = Socket.new(Socket::AF_UNIX, Socket::SOCK_DGRAM, 0)
begin
# bind client domain socket
socket.bind(Socket.pack_sockaddr_un(client_sock_path))
# connect to server with our client socket
socket.connect(Socket.pack_sockaddr_un(src_sock_path))
# send STATUS command
socket.send('STATUS', 0)
# receive 1024 bytes (totally arbitrary value)
# split lines by \n
# store in variable wpa_data.
wpa_data = socket.recv(1024)
rescue => e
$stderr.puts 'WARN: unable to gather wpa data: ' + e.inspect
end
# close or next time we attempt to read it will fail.
socket.close
begin
# remove the domain socket file for the client
File.unlink(client_sock_path)
rescue => e
$stderr.puts 'WARN: ' + e.inspect
end
unless wpa_data.nil?
@wifis = Hash[wpa_data.split(/\n/).map\
{|line|
# first, split into pairs delimited by '='
key,value = line.split('=')
# if key is camel-humped then put space in front
# of capped letter
if key =~ /[a-z][A-Z]/
key.gsub!(/([a-z])([A-Z])/,'\\1_\\2')
end
# if key is "id" then rename it.
key.eql?('id') && key = 'wpa_id'
# fix key so that it can be used as a table name
# by replacing spaces with underscores
key.gsub!(' ','_')
# lower case it.
key.downcase!
[key,value]
}]
end
end
编辑: 到目前为止还没有人能回答这个问题。我想我更喜欢wpa方法,因为我从中获得更多的数据。也就是说,我想说的是,如果有人使用wpa代码,请注意它需要升级权限才能读取套接字。
编辑^ 2(完整的代码片段): 感谢@dasup我已经能够上我的课重因子正确拉BSSID和使用系统的读写控制的ESSID。 (因人而异给出的实施,年龄和其他任何可能破坏稳定的事情你的Linux发行版 - 下面的代码片段与3.2和3.7内核的工作虽然)
require 'socket'
class Wpa
attr_accessor :essid, :bssid, :if
def initialize(interface)
@if = interface
puts 'essid: ' + _get_essid.inspect
puts 'bssid: ' + _get_bssid.inspect
end
def _get_essid
# Copied from wireless.h
iwreq = [@if, " " * 32, 32, 0 ].pack('a16pII')
sock = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM, 0)
sock.ioctl(0x8B1B, iwreq)
@essid = iwreq.unpack('@16p').pop.strip
end
def _get_bssid
# Copied from wireless.h
# supposing a 16 byte address and 32 byte buffer but I'm totally
# guessing here.
iwreq = [@if, "\0" * 32].pack('a16a32')
sock = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM, 0)
# from wireless.h
# SIOCGIWAP 0x8B15 /* get access point MAC addresses */
sock.ioctl(0x8B15, iwreq) # always get an error: Can't convert string to Integer
@bssid = iwreq.unpack('@18H2H2H2H2H2H2').join(':')
end
end
h = Wpa.new('wlan0')
答
我不是很熟悉的红宝石,但是我发现了两个错误:
- SIOCGIWAP的十六进制数应该没有引号/嘀嗒声。
- 数据缓冲区的初始化以接口名称后面的一些尾随字节结尾(使用
gdb
进行调试)。下面给出的初始化工作。
要知道,你的代码将打破,如果任何数据结构或常数的变化(IFNAMSIZ,上sa_family,结构sockaddr等),但我不认为这样的变化很快可能随时。
require 'socket'
def _get_bssid(interface)
# Copied from wireless.h
# supposing a 16 byte address and 32 byte buffer but I'm totally
# guessing here.
iwreq = [interface, "\0" * 32].pack('a16a32')
sock = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM, 0)
# from wireless.h
# SIOCGIWAP 0x8B15 /* get access point MAC addresses */
sock.ioctl(0x8B15, iwreq) # always get an error: Can't convert string to Integer
puts iwreq.inspect
end
你会得到一个数组/有缓冲:
- 您发送的接口名称,补齐
0x00
字节到16个字节的总长度。 - 后面跟着
struct sockaddr
,即一个双字节标识符0x01 0x00
(来自ARPHRD_ETHER
?),接着是填充有0x00
字节的BSSID,总长度为14字节。
祝你好运!
这太棒了。然而,我遇到的一个问题是从ioctl返回的数组中提取BSSID。当我解压缩它时,我得到一个“\ x00”的BSSID。我想我可能会错误地解压缩它:'interface,foo,@bssid = iwreq.unpack('a16x214a')' – Jim
请参见[Ruby包含#unpack方法的文档](http://www.ruby-doc.org/芯2.1.0/String.html#方法-I-解包)。以下工作适用于我,并以当前AP的MAC地址作为十六进制数字串:'bssid = iwreq.unpack('x16x2H12')'。 (它跳过16个字节的零填充接口名称和两个字节的地址类型。)如果我的答案解决了您的问题,请不要忘记选择它作为接受的答案。 – dasup
啊! DUH!我在想什么?十六进制值返回!不是ascii!感谢你! – Jim