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I need to following using Raspberry Pi using only C program (or C++)

  • start and stop access point

  • connect to a particular access point(with username and password)

  • disconnect from access point
  • stop and start WiFi
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    Are you looking for direct "low-level" APIs for Linux wireless manipulation, or would wrapping existing command line tools in C be sufficient? You could easily wrap iw via popen()and pclose() in C and it would be a tenth the amount of work. – Hydranix Nov 7 '16 at 8:42
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If you are looking out for ways to interact with any wpa_supplicant then you can use the control interface exposed by it. wpa_supplicant source itself has two files wpa_ctrl.c and wpa_ctrl.h you can create a library on top of this file, the following link will provide the necessary details on how to use the control interface to interact with wpa_supplicant.

Control interface reference

Also wpa_cli itself uses this control interface to talk with wpa_supplicant you can checkout wpa_cli code for reference as well.

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WPA Supplicant exposes its API via D-Bus interface typically called fi.epitest.hostap.WPASupplicant or fi.w1.wpa_supplicant1, so you can use that. The advantage of D-Bus is that you can connect to it with debug tools like dbus-monitor and test the API before you start writing code.

Here are some useful sources:

  • Documentation of WPA Supplicant API
  • D-Bus modules reference (I suggest you start by reading about DBusConnection and DBusMessage).
  • A tutorial explaining how to connect to D-Bus and send/receive messages in C.

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