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+\page code_structure Structure of the source code
+[ \ref wpa_supplicant_core "wpa_supplicant core functionality" |
+\ref generic_helper_func "Generic helper functions" |
+\ref crypto_func "Cryptographic functions" |
+\ref tls_func "TLS library" |
+\ref configuration "Configuration" |
+\ref ctrl_iface "Control interface" |
+\ref wpa_code "WPA supplicant" |
+\ref eap_peer "EAP peer" |
+\ref eapol_supp "EAPOL supplicant" |
+\ref win_port "Windows port" |
+\ref test_programs "Test programs" ]
+%wpa_supplicant implementation is divided into number of independent
+modules. Core code includes functionality for controlling the network
+selection, association, and configuration. Independent modules include
+WPA code (key handshake, PMKSA caching, pre-authentication), EAPOL
+state machine, and EAP state machine and methods. In addition, there
+are number of separate files for generic helper functions.
+Both WPA and EAPOL/EAP state machines can be used separately in other
+programs than %wpa_supplicant. As an example, the included test
+programs eapol_test and preauth_test are using these modules.
+\ref driver_wrapper "Driver interface API" is defined in driver.h and
+all hardware/driver dependent functionality is implemented in
+\section wpa_supplicant_core wpa_supplicant core functionality
+ Program initialization, main control loop
+ main() for UNIX-like operating systems and MinGW (Windows); this
+ uses command line arguments to configure wpa_supplicant
+ Driver event processing; wpa_supplicant_event() and related functions
+ Internal definitions for %wpa_supplicant core; should not be
+ included into independent modules
+\section generic_helper_func Generic helper functions
+%wpa_supplicant uses generic helper functions some of which are shared
+with with hostapd. The following C files are currently used:
+eloop.c and eloop.h
+ Event loop (select() loop with registerable timeouts, socket read
+ callbacks, and signal callbacks)
+common.c and common.h
+ Common helper functions
+ Definitions shared by multiple files
+l2_packet.h, l2_packet_linux.c, and l2_packet_pcap.c
+ Layer 2 (link) access wrapper (includes native Linux implementation
+ and wrappers for libdnet/libpcap). A new l2_packet implementation
+ may need to be added when porting to new operating systems that are
+ not supported by libdnet/libpcap. Makefile can be used to select which
+ l2_packet implementation is included. l2_packet_linux.c uses Linux
+ packet sockets and l2_packet_pcap.c has a more portable version using
+ libpcap and libdnet.
+pcsc_funcs.c and pcsc_funcs.h
+ Wrapper for PC/SC lite SIM and smart card readers
+ Private version of netlink definitions from Linux kernel header files;
+ this could be replaced with C library header file once suitable
+ version becomes commonly available
+ Version number definitions
+ Private version of Linux wireless extensions definitions from kernel
+ header files; this could be replaced with C library header file once
+ suitable version becomes commonly available
+\section crypto_func Cryptographic functions
+md5.c and md5.h
+ MD5 (replaced with a crypto library if TLS support is included)
+ HMAC-MD5 (keyed checksum for message authenticity validation)
+rc4.c and rc4.h
+ RC4 (broadcast/default key encryption)
+sha1.c and sha1.h
+ SHA-1 (replaced with a crypto library if TLS support is included)
+ HMAC-SHA-1 (keyed checksum for message authenticity validation)
+ PRF-SHA-1 (pseudorandom (key/nonce generation) function)
+ PBKDF2-SHA-1 (ASCII passphrase to shared secret)
+ T-PRF (for EAP-FAST)
+ TLS-PRF (RFC 2246)
+sha256.c and sha256.h
+ SHA-256 (replaced with a crypto library if TLS support is included)
+aes_wrap.c, aes_wrap.h, aes.c
+ AES (replaced with a crypto library if TLS support is included),
+ AES Key Wrap Algorithm with 128-bit KEK, RFC3394 (broadcast/default
+ key encryption),
+ One-Key CBC MAC (OMAC1) hash with AES-128,
+ AES-128 CTR mode encryption,
+ AES-128 EAX mode encryption/decryption,
+ AES-128 CBC
+ Definition of crypto library wrapper
+ Wrapper functions for libcrypto (OpenSSL)
+ Wrapper functions for internal crypto implementation
+ Wrapper functions for libgcrypt (used by GnuTLS)
+ms_funcs.c and ms_funcs.h
+ Helper functions for MSCHAPV2 and LEAP
+ Definition of TLS library wrapper
+ Dummy implementation of TLS library wrapper for cases where TLS
+ functionality is not included.
+ TLS library wrapper for openssl
+ TLS library for internal TLS implementation
+ TLS library wrapper for GnuTLS
+\section tls_func TLS library
+asn1.c and asn1.h
+ ASN.1 DER parsing
+bignum.c and bignum.h
+ Big number math
+rsa.c and rsa.h
+x509v3.c and x509v3.h
+ X.509v3 certificate parsing and processing
+tlsv1_client.c, tlsv1_client.h
+ TLSv1 client (RFC 2246)
+ Internal structures for TLSv1 client
+ TLSv1 client: read handshake messages
+ TLSv1 client: write handshake messages
+tlsv1_common.c and tlsv1_common.h
+ Common TLSv1 routines and definitions
+tlsv1_cred.c and tlsv1_cred.h
+ TLSv1 credentials
+tlsv1_record.c and tlsv1_record.h
+ TLSv1 record protocol
+\section configuration Configuration
+ Definition of per network configuration items
+ Definition of the %wpa_supplicant configuration
+ Configuration parser and common functions
+ Configuration backend for text files (e.g., wpa_supplicant.conf)
+ Configuration backend for Windows registry
+\section ctrl_iface Control interface
+%wpa_supplicant has a \ref ctrl_iface_page "control interface"
+that can be used to get status
+information and manage operations from external programs. An example
+command line interface (wpa_cli) and GUI (wpa_gui) for this interface
+are included in the %wpa_supplicant distribution.
+ctrl_iface.c and ctrl_iface.h
+ %wpa_supplicant-side of the control interface
+ UNIX domain sockets -based control interface backend
+ UDP sockets -based control interface backend
+ Windows named pipes -based control interface backend
+wpa_ctrl.c and wpa_ctrl.h
+ Library functions for external programs to provide access to the
+ %wpa_supplicant control interface
+ Example program for using %wpa_supplicant control interface
+\section wpa_code WPA supplicant
+wpa.c and wpa.h
+ WPA state machine and 4-Way/Group Key Handshake processing
+preauth.c and preauth.h
+ PMKSA caching and pre-authentication (RSN/WPA2)
+ Internal definitions for WPA code; not to be included to other modules.
+\section eap_peer EAP peer
+\ref eap_module "EAP peer implementation" is a separate module that
+can be used by other programs than just %wpa_supplicant.
+eap.c and eap.h
+ EAP state machine and method interface
+ Common EAP definitions
+ Internal definitions for EAP state machine and EAP methods; not to be
+ included in other modules
+eap_sim_common.c and eap_sim_common.h
+ Common code for EAP-SIM and EAP-AKA
+eap_tls_common.c and eap_tls_common.h
+ Common code for EAP-PEAP, EAP-TTLS, and EAP-FAST
+eap_tlv.c and eap_tlv.h
+ EAP-TLV code for EAP-PEAP and EAP-FAST
+eap_ttls.c and eap_ttls.h
+eap_pax.c, eap_pax_common.h, eap_pax_common.c
+eap_psk.c, eap_psk_common.h, eap_psk_common.c
+ EAP-PSK (note: this is not needed for WPA-PSK)
+eap_sake.c, eap_sake_common.h, eap_sake_common.c
+eap_gpsk.c, eap_gpsk_common.h, eap_gpsk_common.c
+eap_aka.c, eap_fast.c, eap_gtc.c, eap_leap.c, eap_md5.c, eap_mschapv2.c,
+eap_otp.c, eap_peap.c, eap_sim.c, eap_tls.c
+ Other EAP method implementations
+\section eapol_supp EAPOL supplicant
+eapol_supp_sm.c and eapol_supp_sm.h
+ EAPOL supplicant state machine and IEEE 802.1X processing
+\section win_port Windows port
+ Code for receiving NdisMIndicateStatus() events and delivering them to
+ %wpa_supplicant driver_ndis.c in more easier to use form
+ External program for listing current network interface
+\section test_programs Test programs
+radius_client.c and radius_client.h
+ RADIUS authentication client implementation for eapol_test
+radius.c and radius.h
+ RADIUS message processing for eapol_test
+ Standalone EAP testing tool with integrated RADIUS authentication
+ client
+ Standalone RSN pre-authentication tool
+ WPA ASCII passphrase to PSK conversion