Import WPA from FreeBSD

对于WPA 加密WiFi，我们需要的是wpa_supplicant 软件，该软件广泛应用于BSD, Linux, Windows等操作系统，主要功能是WiFi管理功能，多用于WPA/WPA2协议的加密WiFi。因此需要从FreeBSD中移植该软件到RTEMS上。注意：该文章是从我的英文博客中翻译过来，因此多数是英文。

We can get the wpa source code from their web site:
https://w1.fi/wpa_supplicant/

For RTEMS-libbsd, we can directly import it from FreeBSD.

1.Firstly, we need add these imported files in libbsd.py.

We create a new module named :usr_sbin_wpa_supplicant, and add files in this module:

+# /usr/sbin/wpa_supplicant+#+def usr_sbin_wpa_supplicant(mm):+    mod = builder.Module('usr_sbin_wpa_supplicant')+    mod.addUserSpaceHeaderFiles(+        [+            'contrib/wpa/wpa_supplicant/ap.h',+            'contrib/wpa/wpa_supplicant/blacklist.h',+            'contrib/wpa/wpa_supplicant/bss.h',+            'contrib/wpa/wpa_supplicant/config.h',+            'contrib/wpa/wpa_supplicant/config_ssid.h',+            'contrib/wpa/wpa_supplicant/ctrl_iface.h',+            'contrib/wpa/wpa_supplicant/driver_i.h',+            'contrib/wpa/wpa_supplicant/gas_query.h',+            'contrib/wpa/wpa_supplicant/hs20_supplicant.h',+            'contrib/wpa/wpa_supplicant/interworking.h',+            'contrib/wpa/wpa_supplicant/mesh.h',+            'contrib/wpa/wpa_supplicant/mesh_mpm.h',+            'contrib/wpa/wpa_supplicant/mesh_rsn.h',+            'contrib/wpa/wpa_supplicant/notify.h',+            'contrib/wpa/wpa_supplicant/offchannel.h',+            'contrib/wpa/wpa_supplicant/scan.h',+            'contrib/wpa/wpa_supplicant/autoscan.h',+            'contrib/wpa/wpa_supplicant/wmm_ac.h',+            'contrib/wpa/wpa_supplicant/wnm_sta.h',+            'contrib/wpa/wpa_supplicant/wpas_glue.h',......+        ]+    )+    mod.addUserSpaceSourceFiles(+        [+            'contrib/wpa/wpa_supplicant/blacklist.c',+            'contrib/wpa/wpa_supplicant/bss.c',+            'contrib/wpa/wpa_supplicant/config.c',+            'contrib/wpa/wpa_supplicant/config_file.c',+            'contrib/wpa/wpa_supplicant/ctrl_iface.c',+            'contrib/wpa/wpa_supplicant/ctrl_iface_unix.c',+            'contrib/wpa/wpa_supplicant/eap_register.c',+            'contrib/wpa/wpa_supplicant/events.c',+            'contrib/wpa/wpa_supplicant/gas_query.c',+            'contrib/wpa/wpa_supplicant/hs20_supplicant.c',+            'contrib/wpa/wpa_supplicant/interworking.c',+            'contrib/wpa/wpa_supplicant/main.c',+            'contrib/wpa/wpa_supplicant/notify.c',+        ],

2.Add the configure macro in mm.generator['source'], we need configure the source files to make sure it can run normally on RTEMS. For these configure macro, we can take the FreeBSD config files as a reference.

The configure file in FreeBSD/usr.sbin/wpa/wpa_supplicant/Makefile

CFLAGS+=-DCONFIG_BACKEND_FILE \ -DCONFIG_DEBUG_SYSLOG \ -DCONFIG_DRIVER_BSD \ -DCONFIG_DRIVER_NDIS \ -DCONFIG_DRIVER_WIRED \ -DCONFIG_GAS \ -DCONFIG_HS20 \ -DCONFIG_IEEE80211R \ -DCONFIG_INTERWORKING \ -DCONFIG_PEERKEY \ -DCONFIG_PRIVSEP \ -DCONFIG_SMARTCARD \ -DCONFIG_TERMINATE_ONLASTIF \ -DCONFIG_TLS=openssl \ -DCONFIG_WPS \ -DCONFIG_WPS2 \ -DCONFIG_WPS_UPNP \ -DPKCS12_FUNCS

What we need to do is add these configure macro in mm.generator['source'].

+        mm.generator['source'](['-D__FreeBSD__=1',+                                '-DCONFIG_BACKEND_FILE=1',+                                '-DCONFIG_DEBUG_SYSLOG=1',+                                '-DCONFIG_DRIVER_BSD=1',+                                '-DCONFIG_DRIVER_NDIS=1',+                                '-DCONFIG_DRIVER_WIRED=1',+                                '-DCONFIG_GAS=1',+                                '-DCONFIG_HS20=1',+                                '-DCONFIG_IEEE80211R=1',+                                '-DCONFIG_INTERWORKING=1',+                                '-DCONFIG_PEERKEY=1',+                                '-DCONFIG_PRIVSEP=1',+                                '-DCONFIG_SMARTCARD=1',+                                '-DCONFIG_TERMINATE_ONLASTIF=1',+                                '-DCONFIG_TLS=openssl',+                                '-DCONFIG_WPS=1',+                                '-DCONFIG_WPS2=1',+                                '-DCONFIG_WPS_UPNP=1',+                                '-DPKCS12_FUNCS=1',+                                '-DCONFIG_SHA256=1',+                                '-DCONFIG_CTRL_IFACE=1',+                                '-DCONFIG_CTRL_IFACE_UNIX=1',+                                '-DIEEE8021X_EAPOL=1',+                                '-DEAP_MD5=1',+                                '-DEAP_GTC=1',+                                '-DEAP_LEAP=1',+                                '-DEAP_MSCHAPv2=1',+                                '-DEAP_OTP=1',+                                '-DEAP_PEAP=1',+                                '-DEAP_PSK=1',+                                '-DEAP_TLS=1',+                                '-DEAP_TTLS=1'],+                               ['freebsd/contrib/wpa/src',+                                'freebsd/contrib/wpa/src/utils',+                                'freebsd/contrib/wpa/src/eap_peer',+                                'freebsd/usr.sbin/wpa/wpa_supplicant',+                                'freebsd/crypto/openssl/crypto'])+    )

3. We need configure a wpa_supplicant command for RTEMS, so we add a command files in rtemsbsd.

+    mod.addRTEMSSourceFiles(+        [+            'rtems/rtems-bsd-shell-wpa_supplicant.c',+        ],+        mm.generator['source']()+    )+    return mod+

4. Last we need add this module into compile in libbsd.py

     mm.addModule(contrib_expat(mm))     mm.addModule(contrib_libpcap(mm))     mm.addModule(usr_sbin_tcpdump(mm))+    mm.addModule(usr_sbin_wpa_supplicant(mm))     mm.addModule(crypto_openssl(mm))