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Full Discussion: Wireless network programming in Unix (question)
Top Forums UNIX for Dummies Questions & Answers Wireless network programming in Unix (question) Post 302447244 by agama on Sunday 22nd of August 2010 12:34:38 AM
Old 08-22-2010
Quote:
But since most of the available tutorials on unix network programming are more related to ethernet programming, I'm not sure if using it for wireless interfaces would be the same. I would like to know if there's any difference between ethernet and wireless raw socket programming.
If by "ethernet" programming you mean opening a file descriptor and binding it to a socket in order to establish a TCP connection, or send UDP (connectionless) datagrams, then whether the underlying datalink layer is ethernet (802.3) or wireless (802.11) makes no difference. This is commonly what is referred to as "socket programming."

Capturing 'raw' datalink layer packets using something like BPF (Berkeley Packet Filter) doesn't require any special knowledge about the underlying datalink layer as the BPF device interface takes care of the differences. You will need to know how to parse the packets that the filter delivers. I'm assuming that the library you referenced (libpcap) provides a similar interface and from the brief look at the documentation it provides the necessary header files to make the interpretation of the data straight forward. My experience is limited to using BPF on both 802.3 and 802.11, so I cannot speak to your question about libpcap structures; sorry.

Two links that might provide some good information:
http://en.wikipedia.org/wiki/OSI_model The OSI networking model
http://www.gsp.com/cgi-bin/man.cgi?section=9&topic=bpf BPF man page
 

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LEARN ABOUT SUNOS

wireless

WIRELESS(7)						     Linux Programmer's Manual						       WIRELESS(7)

NAME

       wireless - Wireless Tools and Wireless Extensions

SYNOPSIS

       iwconfig
       iwpriv -a

DESCRIPTION

       The  Wireless  Extensions  is  an API allowing you manipulate Wireless LAN networking interfaces.  It is composed of a variety of tools and
       configuration files. It is documented in more detail in the Linux Wireless LAN Howto.
       The Wireless Tools are used to change the configuration of wireless LAN networking interfaces on the fly, to get their  current	configura-
       tion, to get statistics and diagnose them. They are described in their own man page, see below for references.
       Wireless  configuration	is specific to each Linux distribution. This man page will contain in the future the configuration procedure for a
       few common distributions. For the time being, check the file DISTRIBUTIONS.txt included with the Wireless Tools package.

DEBIAN 3.0
       In Debian 3.0 (and later) you can configure wireless LAN networking devices using the network configuration tool ifupdown(8).

       File : /etc/network/interfaces

       Form : wireless-<function> <value>
	      wireless-essid Home
	      wireless-mode Ad-Hoc

       See also :
	      /etc/network/if-pre-up.d/wireless-tools
	      /usr/share/doc/wireless-tools/README.Debian

SuSE 8.0
       SuSE 8.0 (and later) has integrated wireless configuration in their network scripts.

       Tool : Yast2

       File : /etc/sysconfig/network/wireless
	      /etc/sysconfig/network/ifcfg-*

       Form : WIRELESS_<function>=<value>
	      WIRELESS_ESSID="Home"
	      WIRELESS_MODE=Ad-Hoc

       See also :
	      man ifup
	      info scpm

ORIGINAL PCMCIA SCRIPTS

       If you are using the original configuration scripts from the Pcmcia package, you can use this method.

       File : /etc/pcmcia/wireless.opts

       Form : *,*,*,*)
		  ESSID="Home"
		  MODE="Ad-Hoc"
		  ;;

       See also :
	      /etc/pcmcia/wireless
	      File PCMCIA.txt part of Wireless Tools package

AUTHOR

       Jean Tourrilhes - jt@hpl.hp.com
       http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/

SEE ALSO

       iwconfig(8), iwlist(8), iwspy(8), iwpriv(8), iwevent(8).

wireless-tools							   4 March 2004 						       WIRELESS(7)
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