2 \page code_structure Structure of the source code
4 [ \ref wpa_supplicant_core "wpa_supplicant core functionality" |
5 \ref generic_helper_func "Generic helper functions" |
6 \ref crypto_func "Cryptographic functions" |
7 \ref configuration "Configuration" |
8 \ref ctrl_iface "Control interface" |
9 \ref wpa_code "WPA supplicant" |
10 \ref eap_peer "EAP peer" |
11 \ref eapol_supp "EAPOL supplicant" |
12 \ref win_port "Windows port" |
13 \ref test_programs "Test programs" ]
15 %wpa_supplicant implementation is divided into number of independent
16 modules. Core code includes functionality for controlling the network
17 selection, association, and configuration. Independent modules include
18 WPA code (key handshake, PMKSA caching, pre-authentication), EAPOL
19 state machine, and EAP state machine and methods. In addition, there
20 are number of separate files for generic helper functions.
22 Both WPA and EAPOL/EAP state machines can be used separately in other
23 programs than %wpa_supplicant. As an example, the included test
24 programs eapol_test and preauth_test are using these modules.
26 \ref driver_wrapper "Driver interface API" is defined in driver.h and
27 all hardware/driver dependent functionality is implemented in
31 \section wpa_supplicant_core wpa_supplicant core functionality
34 Program initialization, main control loop
37 main() for UNIX-like operating systems and MinGW (Windows); this
38 uses command line arguments to configure wpa_supplicant
41 Driver event processing; wpa_supplicant_event() and related functions
44 Internal definitions for %wpa_supplicant core; should not be
45 included into independent modules
48 Definitions for driver event data and message logging
51 \section generic_helper_func Generic helper functions
53 %wpa_supplicant uses generic helper functions some of which are shared
54 with with hostapd. The following C files are currently used:
57 Event loop (select() loop with registerable timeouts, socket read
58 callbacks, and signal callbacks)
61 Common helper functions
64 Definitions shared by multiple files
66 l2_packet.h, l2_packet_linux.c, and l2_packet_pcap.c
67 Layer 2 (link) access wrapper (includes native Linux implementation
68 and wrappers for libdnet/libpcap). A new l2_packet implementation
69 may need to be added when porting to new operating systems that are
70 not supported by libdnet/libpcap. Makefile can be used to select which
71 l2_packet implementation is included. l2_packet_linux.c uses Linux
72 packet sockets and l2_packet_pcap.c has a more portable version using
75 pcsc_funcs.c and pcsc_funcs.h
76 Wrapper for PC/SC lite SIM and smart card readers
79 Private version of netlink definitions from Linux kernel header files;
80 this could be replaced with C library header file once suitable
81 version becomes commonly available
84 Version number definitions
87 Private version of Linux wireless extensions definitions from kernel
88 header files; this could be replaced with C library header file once
89 suitable version becomes commonly available
92 \section crypto_func Cryptographic functions
95 MD5 (replaced with a crypto library if TLS support is included)
96 HMAC-MD5 (keyed checksum for message authenticity validation)
99 RC4 (broadcast/default key encryption)
102 SHA-1 (replaced with a crypto library if TLS support is included)
103 HMAC-SHA-1 (keyed checksum for message authenticity validation)
104 PRF-SHA-1 (pseudorandom (key/nonce generation) function)
105 PBKDF2-SHA-1 (ASCII passphrase to shared secret)
109 aes_wrap.c, aes_wrap.h, aes.c
110 AES (replaced with a crypto library if TLS support is included),
111 AES Key Wrap Algorithm with 128-bit KEK, RFC3394 (broadcast/default
113 One-Key CBC MAC (OMAC1) hash with AES-128,
114 AES-128 CTR mode encryption,
115 AES-128 EAX mode encryption/decryption,
119 Definition of crypto library wrapper
122 Wrapper functions for libcrypto (OpenSSL)
125 Wrapper functions for libgcrypt (used by GnuTLS)
127 ms_funcs.c and ms_funcs.h
128 Helper functions for MSCHAPV2 and LEAP
131 Definition of TLS library wrapper
134 Dummy implementation of TLS library wrapper for cases where TLS
135 functionality is not included.
138 TLS library wrapper for openssl
141 TLS library wrapper for GnuTLS
144 \section configuration Configuration
147 Definition of per network configuration items
150 Definition of the %wpa_supplicant configuration
153 Configuration parser and common functions
156 Configuration backend for text files (e.g., wpa_supplicant.conf)
159 \section ctrl_iface Control interface
161 %wpa_supplicant has a \ref ctrl_iface_page "control interface"
162 that can be used to get status
163 information and manage operations from external programs. An example
164 command line interface (wpa_cli) and GUI (wpa_gui) for this interface
165 are included in the %wpa_supplicant distribution.
167 ctrl_iface.c and ctrl_iface.h
168 %wpa_supplicant-side of the control interface
170 wpa_ctrl.c and wpa_ctrl.h
171 Library functions for external programs to provide access to the
172 %wpa_supplicant control interface
175 Example program for using %wpa_supplicant control interface
178 \section wpa_code WPA supplicant
181 WPA state machine and 4-Way/Group Key Handshake processing
183 preauth.c and preauth.h
184 PMKSA caching and pre-authentication (RSN/WPA2)
187 Internal definitions for WPA code; not to be included to other modules.
189 \section eap_peer EAP peer
191 \ref eap_module "EAP peer implementation" is a separate module that
192 can be used by other programs than just %wpa_supplicant.
195 EAP state machine and method interface
198 Common EAP definitions
201 Internal definitions for EAP state machine and EAP methods; not to be
202 included in other modules
204 eap_sim_common.c and eap_sim_common.h
205 Common code for EAP-SIM and EAP-AKA
207 eap_tls_common.c and eap_tls_common.h
208 Common code for EAP-PEAP, EAP-TTLS, and EAP-FAST
210 eap_tlv.c and eap_tlv.h
211 EAP-TLV code for EAP-PEAP and EAP-FAST
213 eap_ttls.c and eap_ttls.h
216 eap_pax.c, eap_pax_common.h, eap_pax_common.c
219 eap_psk.c, eap_psk_common.h, eap_psk_common.c
220 EAP-PSK (note: this is not needed for WPA-PSK)
222 eap_aka.c, eap_fast.c, eap_gtc.c, eap_leap.c, eap_md5.c, eap_mschapv2.c,
223 eap_otp.c, eap_peap.c, eap_sim.c, eap_tls.c
224 Other EAP method implementations
227 \section eapol_supp EAPOL supplicant
229 eapol_sm.c and eapol_sm.h
230 EAPOL supplicant state machine and IEEE 802.1X processing
233 \section win_port Windows port
236 External program for receiving NdisMIndicateStatus() events and
237 delivering them to %wpa_supplicant in more easier to use form
240 External program for listing current network interface
243 \section test_programs Test programs
245 radius_client.c and radius_client.h
246 RADIUS authentication client implementation for eapol_test
248 radius.c and radius.h
249 RADIUS message processing for eapol_test
251 config_types.h and hostapd.h
252 Minimal version of hostapd header files for eapol_test
255 Standalone EAP testing tool with integrated RADIUS authentication
259 Standalone RSN pre-authentication tool
262 WPA ASCII passphrase to PSK conversion