arm环境下，wpa_supplicant交错编译+wifi sta毗连详解

1、前言

        wpa_supplicant 是一个用于 WiFi 客户端的加密认证工具，支持 WEP、WPA、WPA2 等多种加密方式。它通常与 wpa_cli 共同使用，用于管理 WiFi 毗连。本文讲解wpa_supplicant 交错编译全过程以及开发板使用wpa_supplican和udhcpc毗连wifi全过程详解。
2、前期预备

假造机：ubuntu18.04
源码：
        libnl-3.11.0.tar.gz
        openssl-1.0.2u.tar.gz
        wpa_supplicant-2.10.tar.gz
代码以及配置文件都已经上传到我的gitee
wpa_supplicent: wpa_supplicent交错编译
3、源码编译

在所有源码目录下建一个文件夹，命名pkgconfig

后续将libnl和opssl编译天生的pkg文件都复制到这个目录下，这是为了wpa_supplicant编译时更好找到libnl和opssl的头文件和库
1、libopssl编译

1. ./config  no-asm shared --prefix=$PWD/_install --cross-compile-prefix=arm-gcc7.3-linux-musleabi-
2. make CC=arm-gcc7.3-linux-musleabi-gcc
3. make install

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需要留意的是如果编译报错:unrecognized command line option '-m64' 
直接编辑Makefile，把-m64选项删除即可
将install目录下天生的lib/pkg目录下的.pc文件都复制到上面建的pkgconfig目录下

2、libnl编译

1. ./configure --host=arm-gcc7.3-linux-musleabi --prefix=$PWD/_install
2. make install

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编译完了，同理，将 .pc文件都复制到上面建的pkgconfig目录下
3、wpa_supplicant编译

wpa_supplicant源码的默认配置里有很多是不需要的，可以做一些裁剪，固然也可以用他的默认配置
使用默认配置：

1. cp defconfig .config

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裁剪后的配置文件.config

1. # Example wpa_supplicant build time configuration
2. #
3. # This file lists the configuration options that are used when building the
4. # hostapd binary. All lines starting with # are ignored. Configuration option
5. # lines must be commented out complete, if they are not to be included, i.e.,
6. # just setting VARIABLE=n is not disabling that variable.
7. #
8. # This file is included in Makefile, so variables like CFLAGS and LIBS can also
9. # be modified from here. In most cases, these lines should use += in order not
10. # to override previous values of the variables.
12. BOARD_WIFI_VENDOR=realtek
14. # Uncomment following two lines and fix the paths if you have installed OpenSSL
15. # or GnuTLS in non-default location
16. #CFLAGS += -I/usr/local/openssl/include
17. #LIBS += -L/usr/local/openssl/lib
19. # Some Red Hat versions seem to include kerberos header files from OpenSSL, but
20. # the kerberos files are not in the default include path. Following line can be
21. # used to fix build issues on such systems (krb5.h not found).
22. #CFLAGS += -I/usr/include/kerberos
24. # Driver interface for generic Linux wireless extensions
25. # Note: WEXT is deprecated in the current Linux kernel version and no new
26. # functionality is added to it. nl80211-based interface is the new
27. # replacement for WEXT and its use allows wpa_supplicant to properly control
28. # the driver to improve existing functionality like roaming and to support new
29. # functionality.
30. #CONFIG_DRIVER_WEXT=y
32. # Driver interface for Linux drivers using the nl80211 kernel interface
33. CONFIG_DRIVER_NL80211=y
35. # QCA vendor extensions to nl80211
36. #CONFIG_DRIVER_NL80211_QCA=y
38. # driver_nl80211.c requires libnl. If you are compiling it yourself
39. # you may need to point hostapd to your version of libnl.
40. #
41. #CFLAGS += -I$<path to libnl include files>
42. #LIBS += -L$<path to libnl library files>
44. # Use libnl v2.0 (or 3.0) libraries.
45. #CONFIG_LIBNL20=y
47. # Use libnl 3.2 libraries (if this is selected, CONFIG_LIBNL20 is ignored)
48. #CONFIG_LIBNL32=y
51. # Driver interface for FreeBSD net80211 layer (e.g., Atheros driver)
52. #CONFIG_DRIVER_BSD=y
53. #CFLAGS += -I/usr/local/include
54. #LIBS += -L/usr/local/lib
55. #LIBS_p += -L/usr/local/lib
56. #LIBS_c += -L/usr/local/lib
58. # Driver interface for Windows NDIS
59. #CONFIG_DRIVER_NDIS=y
60. #CFLAGS += -I/usr/include/w32api/ddk
61. #LIBS += -L/usr/local/lib
62. # For native build using mingw
63. #CONFIG_NATIVE_WINDOWS=y
64. # Additional directories for cross-compilation on Linux host for mingw target
65. #CFLAGS += -I/opt/mingw/mingw32/include/ddk
66. #LIBS += -L/opt/mingw/mingw32/lib
67. #CC=mingw32-gcc
68. # By default, driver_ndis uses WinPcap for low-level operations. This can be
69. # replaced with the following option which replaces WinPcap calls with NDISUIO.
70. # However, this requires that WZC is disabled (net stop wzcsvc) before starting
71. # wpa_supplicant.
72. # CONFIG_USE_NDISUIO=y
74. # Driver interface for wired Ethernet drivers
75. #CONFIG_DRIVER_WIRED=y
77. # Driver interface for the Broadcom RoboSwitch family
78. #CONFIG_DRIVER_ROBOSWITCH=y
80. # Driver interface for no driver (e.g., WPS ER only)
81. #CONFIG_DRIVER_NONE=y
83. # Solaris libraries
84. #LIBS += -lsocket -ldlpi -lnsl
85. #LIBS_c += -lsocket
87. # Enable IEEE 802.1X Supplicant (automatically included if any EAP method is
88. # included)
89. CONFIG_IEEE8021X_EAPOL=y
91. # EAP-MD5
92. CONFIG_EAP_MD5=y
94. # EAP-MSCHAPv2
95. CONFIG_EAP_MSCHAPV2=y
97. # EAP-TLS
98. CONFIG_EAP_TLS=y
100. # EAL-PEAP
101. CONFIG_EAP_PEAP=y
103. # EAP-TTLS
104. CONFIG_EAP_TTLS=y
106. # EAP-FAST
107. # Note: If OpenSSL is used as the TLS library, OpenSSL 1.0 or newer is needed
108. # for EAP-FAST support. Older OpenSSL releases would need to be patched, e.g.,
109. # with openssl-0.9.8x-tls-extensions.patch, to add the needed functions.
110. # CONFIG_EAP_FAST=y
112. # EAP-GTC
113. CONFIG_EAP_GTC=y
115. # EAP-OTP
116. CONFIG_EAP_OTP=y
118. # EAP-SIM (enable CONFIG_PCSC, if EAP-SIM is used)
119. # CONFIG_EAP_SIM=y
121. # EAP-PSK (experimental; this is _not_ needed for WPA-PSK)
122. #CONFIG_EAP_PSK=y
124. # EAP-pwd (secure authentication using only a password)
125. #CONFIG_EAP_PWD=y
127. # EAP-PAX
128. #CONFIG_EAP_PAX=y
130. # LEAP
131. CONFIG_EAP_LEAP=y
133. # EAP-AKA (enable CONFIG_PCSC, if EAP-AKA is used)
134. # CONFIG_EAP_AKA=y
136. # EAP-AKA' (enable CONFIG_PCSC, if EAP-AKA' is used).
137. # This requires CONFIG_EAP_AKA to be enabled, too.
138. # CONFIG_EAP_AKA_PRIME=y
140. # Enable USIM simulator (Milenage) for EAP-AKA
141. #CONFIG_USIM_SIMULATOR=y
143. # EAP-SAKE
144. #CONFIG_EAP_SAKE=y
146. # EAP-GPSK
147. #CONFIG_EAP_GPSK=y
148. # Include support for optional SHA256 cipher suite in EAP-GPSK
149. #CONFIG_EAP_GPSK_SHA256=y
151. # EAP-TNC and related Trusted Network Connect support (experimental)
152. #CONFIG_EAP_TNC=y
154. # Wi-Fi Protected Setup (WPS)
155. # CONFIG_WPS=y
156. # Enable WPS external registrar functionality
157. # CONFIG_WPS_ER=y
158. # Disable credentials for an open network by default when acting as a WPS
159. # registrar.
160. #CONFIG_WPS_REG_DISABLE_OPEN=y
161. # Enable WPS support with NFC config method
162. # CONFIG_WPS_NFC=y
164. # EAP-IKEv2
165. #CONFIG_EAP_IKEV2=y
167. # EAP-EKE
168. #CONFIG_EAP_EKE=y
170. # PKCS#12 (PFX) support (used to read private key and certificate file from
171. # a file that usually has extension .p12 or .pfx)
172. CONFIG_PKCS12=y
174. # Smartcard support (i.e., private key on a smartcard), e.g., with openssl
175. # engine.
176. CONFIG_SMARTCARD=y
178. # PC/SC interface for smartcards (USIM, GSM SIM)
179. # Enable this if EAP-SIM or EAP-AKA is included
180. #CONFIG_PCSC=y
182. # Support HT overrides (disable HT/HT40, mask MCS rates, etc.)
183. #CONFIG_HT_OVERRIDES=y
185. # Support VHT overrides (disable VHT, mask MCS rates, etc.)
186. #CONFIG_VHT_OVERRIDES=y
188. # Development testing
189. #CONFIG_EAPOL_TEST=y
191. # Select control interface backend for external programs, e.g, wpa_cli:
192. # unix = UNIX domain sockets (default for Linux/*BSD)
193. # udp = UDP sockets using localhost (127.0.0.1)
194. # udp6 = UDP IPv6 sockets using localhost (::1)
195. # named_pipe = Windows Named Pipe (default for Windows)
196. # udp-remote = UDP sockets with remote access (only for tests systems/purpose)
197. # udp6-remote = UDP IPv6 sockets with remote access (only for tests purpose)
198. # y = use default (backwards compatibility)
199. # If this option is commented out, control interface is not included in the
200. # build.
201. CONFIG_CTRL_IFACE=y
202. # Include support for GNU Readline and History Libraries in wpa_cli.
203. # When building a wpa_cli binary for distribution, please note that these
204. # libraries are licensed under GPL and as such, BSD license may not apply for
205. # the resulting binary.
206. #CONFIG_READLINE=y
207. # Include internal line edit mode in wpa_cli. This can be used as a replacement
208. # for GNU Readline to provide limited command line editing and history support.
209. # CONFIG_WPA_CLI_EDIT=y
210. # Remove debugging code that is printing out debug message to stdout.
211. # This can be used to reduce the size of the wpa_supplicant considerably
212. # if debugging code is not needed. The size reduction can be around 35%
213. # (e.g., 90 kB).
214. #CONFIG_NO_STDOUT_DEBUG=y
215. # Remove WPA support, e.g., for wired-only IEEE 802.1X supplicant, to save
216. # 35-50 kB in code size.
217. #CONFIG_NO_WPA=y
218. # Remove IEEE 802.11i/WPA-Personal ASCII passphrase support
219. # This option can be used to reduce code size by removing support for
220. # converting ASCII passphrases into PSK. If this functionality is removed, the
221. # PSK can only be configured as the 64-octet hexstring (e.g., from
222. # wpa_passphrase). This saves about 0.5 kB in code size.
223. #CONFIG_NO_WPA_PASSPHRASE=y
224. # Disable scan result processing (ap_mode=1) to save code size by about 1 kB.
225. # This can be used if ap_scan=1 mode is never enabled.
226. #CONFIG_NO_SCAN_PROCESSING=y
227. # Select configuration backend:
228. # file = text file (e.g., wpa_supplicant.conf; note: the configuration file
229. #        path is given on command line, not here; this option is just used to
230. #        select the backend that allows configuration files to be used)
231. # winreg = Windows registry (see win_example.reg for an example)
232. CONFIG_BACKEND=file
233. # Remove configuration write functionality (i.e., to allow the configuration
234. # file to be updated based on runtime configuration changes). The runtime
235. # configuration can still be changed, the changes are just not going to be
236. # persistent over restarts. This option can be used to reduce code size by
237. # about 3.5 kB.
238. #CONFIG_NO_CONFIG_WRITE=y
239. # Remove support for configuration blobs to reduce code size by about 1.5 kB.
240. #CONFIG_NO_CONFIG_BLOBS=y
241. # Select program entry point implementation:
242. # main = UNIX/POSIX like main() function (default)
243. # main_winsvc = Windows service (read parameters from registry)
244. # main_none = Very basic example (development use only)
245. #CONFIG_MAIN=main
246. # Select wrapper for operating system and C library specific functions
247. # unix = UNIX/POSIX like systems (default)
248. # win32 = Windows systems
249. # none = Empty template
250. # CONFIG_OS=unix
251. # Select event loop implementation
252. # eloop = select() loop (default)
253. # eloop_win = Windows events and WaitForMultipleObject() loop
254. # CONFIG_ELOOP=eloop
255. # Should we use poll instead of select? Select is used by default.
256. #CONFIG_ELOOP_POLL=y
257. # Should we use epoll instead of select? Select is used by default.
258. #CONFIG_ELOOP_EPOLL=y
259. # Should we use kqueue instead of select? Select is used by default.
260. #CONFIG_ELOOP_KQUEUE=y
261. # Select layer 2 packet implementation
262. # linux = Linux packet socket (default)
263. # pcap = libpcap/libdnet/WinPcap
264. # freebsd = FreeBSD libpcap
265. # winpcap = WinPcap with receive thread
266. # ndis = Windows NDISUIO (note: requires CONFIG_USE_NDISUIO=y)
267. # none = Empty template
268. # CONFIG_L2_PACKET=linux
269. # Disable Linux packet socket workaround applicable for station interface
270. # in a bridge for EAPOL frames. This should be uncommented only if the kernel
271. # is known to not have the regression issue in packet socket behavior with
272. # bridge interfaces (commit 'bridge: respect RFC2863 operational state')').
273. #CONFIG_NO_LINUX_PACKET_SOCKET_WAR=y
274. # PeerKey handshake for Station to Station Link (IEEE 802.11e DLS)
275. CONFIG_PEERKEY=y
276. # IEEE 802.11w (management frame protection), also known as PMF
277. # Driver support is also needed for IEEE 802.11w.
278. # CONFIG_IEEE80211W=y
279. # Select TLS implementation
280. # openssl = OpenSSL (default)
281. # gnutls = GnuTLS
282. # internal = Internal TLSv1 implementation (experimental)
283. # none = Empty template
284. CONFIG_TLS=internal
285. # TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.1)
286. # can be enabled to get a stronger construction of messages when block ciphers
287. # are used. It should be noted that some existing TLS v1.0 -based
288. # implementation may not be compatible with TLS v1.1 message (ClientHello is
289. # sent prior to negotiating which version will be used)
290. #CONFIG_TLSV11=y
291. # TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.2)
292. # can be enabled to enable use of stronger crypto algorithms. It should be
293. # noted that some existing TLS v1.0 -based implementation may not be compatible
294. # with TLS v1.2 message (ClientHello is sent prior to negotiating which version
295. # will be used)
296. #CONFIG_TLSV12=y
297. # If CONFIG_TLS=internal is used, additional library and include paths are
298. # needed for LibTomMath. Alternatively, an integrated, minimal version of
299. # LibTomMath can be used. See beginning of libtommath.c for details on benefits
300. # and drawbacks of this option.
301. CONFIG_INTERNAL_LIBTOMMATH=y
302. #ifndef CONFIG_INTERNAL_LIBTOMMATH
303. #LTM_PATH=/usr/src/libtommath-0.39
304. #CFLAGS += -I$(LTM_PATH)
305. #LIBS += -L$(LTM_PATH)
306. #LIBS_p += -L$(LTM_PATH)
307. #endif
308. # At the cost of about 4 kB of additional binary size, the internal LibTomMath
309. # can be configured to include faster routines for exptmod, sqr, and div to
310. # speed up DH and RSA calculation considerably
311. #CONFIG_INTERNAL_LIBTOMMATH_FAST=y
312. # Include NDIS event processing through WMI into wpa_supplicant/wpasvc.
313. # This is only for Windows builds and requires WMI-related header files and
314. # WbemUuid.Lib from Platform SDK even when building with MinGW.
315. #CONFIG_NDIS_EVENTS_INTEGRATED=y
316. #PLATFORMSDKLIB="/opt/Program Files/Microsoft Platform SDK/Lib"
317. # Add support for old DBus control interface
318. # (fi.epitest.hostap.WPASupplicant)
319. #CONFIG_CTRL_IFACE_DBUS=y
320. # Add support for new DBus control interface
321. # (fi.w1.hostap.wpa_supplicant1)
322. #CONFIG_CTRL_IFACE_DBUS_NEW=y
323. # Add introspection support for new DBus control interface
324. #CONFIG_CTRL_IFACE_DBUS_INTRO=y
325. # Add support for loading EAP methods dynamically as shared libraries.
326. # When this option is enabled, each EAP method can be either included
327. # statically (CONFIG_EAP_<method>=y) or dynamically (CONFIG_EAP_<method>=dyn).
328. # Dynamic EAP methods are build as shared objects (eap_*.so) and they need to
329. # be loaded in the beginning of the wpa_supplicant configuration file
330. # (see load_dynamic_eap parameter in the example file) before being used in
331. # the network blocks.
332. #
333. # Note that some shared parts of EAP methods are included in the main program
334. # and in order to be able to use dynamic EAP methods using these parts, the
335. # main program must have been build with the EAP method enabled (=y or =dyn).
336. # This means that EAP-TLS/PEAP/TTLS/FAST cannot be added as dynamic libraries
337. # unless at least one of them was included in the main build to force inclusion
338. # of the shared code. Similarly, at least one of EAP-SIM/AKA must be included
339. # in the main build to be able to load these methods dynamically.
340. #
341. # Please also note that using dynamic libraries will increase the total binary
342. # size. Thus, it may not be the best option for targets that have limited
343. # amount of memory/flash.
344. #CONFIG_DYNAMIC_EAP_METHODS=y
345. # IEEE Std 802.11r-2008 (Fast BSS Transition)
346. # CONFIG_IEEE80211R=y
347. # Add support for writing debug log to a file (/tmp/wpa_supplicant-log-#.txt)
348. # CONFIG_DEBUG_FILE=y
349. # Send debug messages to syslog instead of stdout
350. #CONFIG_DEBUG_SYSLOG=y
351. # Set syslog facility for debug messages
352. #CONFIG_DEBUG_SYSLOG_FACILITY=LOG_DAEMON
353. # Add support for sending all debug messages (regardless of debug verbosity)
354. # to the Linux kernel tracing facility. This helps debug the entire stack by
355. # making it easy to record everything happening from the driver up into the
356. # same file, e.g., using trace-cmd.
357. #CONFIG_DEBUG_LINUX_TRACING=y
358. # Add support for writing debug log to Android logcat instead of standard
359. # output
360. # CONFIG_ANDROID_LOG=y
361. # Enable privilege separation (see README 'Privilege separation' for details)
362. #CONFIG_PRIVSEP=y
363. # Enable mitigation against certain attacks against TKIP by delaying Michael
364. # MIC error reports by a random amount of time between 0 and 60 seconds
365. #CONFIG_DELAYED_MIC_ERROR_REPORT=y
366. # Enable tracing code for developer debugging
367. # This tracks use of memory allocations and other registrations and reports
368. # incorrect use with a backtrace of call (or allocation) location.
369. #CONFIG_WPA_TRACE=y
370. # For BSD, uncomment these.
371. #LIBS += -lexecinfo
372. #LIBS_p += -lexecinfo
373. #LIBS_c += -lexecinfo
374. # Use libbfd to get more details for developer debugging
375. # This enables use of libbfd to get more detailed symbols for the backtraces
376. # generated by CONFIG_WPA_TRACE=y.
377. #CONFIG_WPA_TRACE_BFD=y
378. # For BSD, uncomment these.
379. #LIBS += -lbfd -liberty -lz
380. #LIBS_p += -lbfd -liberty -lz
381. #LIBS_c += -lbfd -liberty -lz
382. # wpa_supplicant depends on strong random number generation being available
383. # from the operating system. os_get_random() function is used to fetch random
384. # data when needed, e.g., for key generation. On Linux and BSD systems, this
385. # works by reading /dev/urandom. It should be noted that the OS entropy pool
386. # needs to be properly initialized before wpa_supplicant is started. This is
387. # important especially on embedded devices that do not have a hardware random
388. # number generator and may by default start up with minimal entropy available
389. # for random number generation.
390. #
391. # As a safety net, wpa_supplicant is by default trying to internally collect
392. # additional entropy for generating random data to mix in with the data fetched
393. # from the OS. This by itself is not considered to be very strong, but it may
394. # help in cases where the system pool is not initialized properly. However, it
395. # is very strongly recommended that the system pool is initialized with enough
396. # entropy either by using hardware assisted random number generator or by
397. # storing state over device reboots.
398. #
399. # wpa_supplicant can be configured to maintain its own entropy store over
400. # restarts to enhance random number generation. This is not perfect, but it is
401. # much more secure than using the same sequence of random numbers after every
402. # reboot. This can be enabled with -e<entropy file> command line option. The
403. # specified file needs to be readable and writable by wpa_supplicant.
404. #
405. # If the os_get_random() is known to provide strong random data (e.g., on
406. # Linux/BSD, the board in question is known to have reliable source of random
407. # data from /dev/urandom), the internal wpa_supplicant random pool can be
408. # disabled. This will save some in binary size and CPU use. However, this
409. # should only be considered for builds that are known to be used on devices
410. # that meet the requirements described above.
411. #CONFIG_NO_RANDOM_POOL=y
412. # IEEE 802.11n (High Throughput) support (mainly for AP mode)
413. CONFIG_IEEE80211N=y
414. # IEEE 802.11ac (Very High Throughput) support (mainly for AP mode)
415. # (depends on CONFIG_IEEE80211N)
416. #CONFIG_IEEE80211AC=y
417. # Wireless Network Management (IEEE Std 802.11v-2011)
418. # Note: This is experimental and not complete implementation.
419. # CONFIG_WNM=y
420. # Interworking (IEEE 802.11u)
421. # This can be used to enable functionality to improve interworking with
422. # external networks (GAS/ANQP to learn more about the networks and network
423. # selection based on available credentials).
424. # CONFIG_INTERWORKING=y
425. # Hotspot 2.0
426. # CONFIG_HS20=y
427. # Enable interface matching in wpa_supplicant
428. #CONFIG_MATCH_IFACE=y
429. # Disable roaming in wpa_supplicant
430. # CONFIG_NO_ROAMING=y
431. # AP mode operations with wpa_supplicant
432. # This can be used for controlling AP mode operations with wpa_supplicant. It
433. # should be noted that this is mainly aimed at simple cases like
434. # WPA2-Personal while more complex configurations like WPA2-Enterprise with an
435. # external RADIUS server can be supported with hostapd.
436. # CONFIG_AP=y
437. # P2P (Wi-Fi Direct)
438. # This can be used to enable P2P support in wpa_supplicant. See README-P2P for
439. # more information on P2P operations.
440. # CONFIG_P2P=y
441. # Enable TDLS support
442. # CONFIG_TDLS=y
443. # Wi-Fi Direct
444. # This can be used to enable Wi-Fi Direct extensions for P2P using an external
445. # program to control the additional information exchanges in the messages.
446. # CONFIG_WIFI_DISPLAY=y
447. # Autoscan
448. # This can be used to enable automatic scan support in wpa_supplicant.
449. # See wpa_supplicant.conf for more information on autoscan usage.
450. #
451. # Enabling directly a module will enable autoscan support.
452. # For exponential module:
453. #CONFIG_AUTOSCAN_EXPONENTIAL=y
454. # For periodic module:
455. #CONFIG_AUTOSCAN_PERIODIC=y
456. # Password (and passphrase, etc.) backend for external storage
457. # These optional mechanisms can be used to add support for storing passwords
458. # and other secrets in external (to wpa_supplicant) location. This allows, for
459. # example, operating system specific key storage to be used
460. #
461. # External password backend for testing purposes (developer use)
462. #CONFIG_EXT_PASSWORD_TEST=y
463. # Enable Fast Session Transfer (FST)
464. #CONFIG_FST=y
465. # Enable CLI commands for FST testing
466. #CONFIG_FST_TEST=y
467. # OS X builds. This is only for building eapol_test.
468. #CONFIG_OSX=y
469. # Automatic Channel Selection
470. # This will allow wpa_supplicant to pick the channel automatically when channel
471. # is set to "0".
472. #
473. # TODO: Extend parser to be able to parse "channel=acs_survey" as an alternative
474. # to "channel=0". This would enable us to eventually add other ACS algorithms in
475. # similar way.
476. #
477. # Automatic selection is currently only done through initialization, later on
478. # we hope to do background checks to keep us moving to more ideal channels as
479. # time goes by. ACS is currently only supported through the nl80211 driver and
480. # your driver must have survey dump capability that is filled by the driver
481. # during scanning.
482. #
483. # TODO: In analogy to hostapd be able to customize the ACS survey algorithm with
484. # a newly to create wpa_supplicant.conf variable acs_num_scans.
485. #
486. # Supported ACS drivers:
487. # * ath9k
488. # * ath5k
489. # * ath10k
490. #
491. # For more details refer to:
492. # http://wireless.kernel.org/en/users/Documentation/acs
493. #CONFIG_ACS=y
494. # Support Multi Band Operation
495. #CONFIG_MBO=y
496. #CONFIG_MESH=y

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好了之后设置一下pkg文件的环境变量

1. export PKG_CONFIG_PATH=/share/test/wpa/pkgconfig/:$PKG_CONFIG_PATH
3. # /share/test/wpa/pkgconfig 一开始建的pkgconfig文件夹

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然后

1. make CC=arm-gcc7.3-linux-musleabi-gcc

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如果有报错找不到-lnl和-lnl-genl-3，就在.config文件中添加libnl的install路径

1. CFLAGS += -I/share/test/wpa/libnl-3.11.0/_install/include/libnl3/
2. LIBS += -L/share/test/wpa/libnl-3.11.0/_install/lib
4. # /share/test/wpa/libnl-3.11.0/_install libnl库install路径

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4、arm环境使用 

团体步骤：

1、安装wifi驱动
2、ifconfig wlan0 up
3、/opt/ipnc/wpa_supplicant -B -iwlan0 -c /opt/ipnc/wpa_supplicant.conf
4、udhcpc -i wlan0
留意点：

其中wpa_supplicant.conf是wifi账号和暗码的配置文件，一般配置为：

1. ctrl_interface=/var/run/wpa_supplicant
2. update_config=1
4. network={
5.         ssid="iphone30promax"
6.         psk="12345678"
7.         scan_ssid=1
8. }

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udhcpc运行时有个默认脚本，这个脚本需要你自己添加，udhcpc -h可查看到脚本默认路径

default.script文件：

1. #!/bin/sh
3. # udhcpc script edited by Tim Riker <Tim@Rikers.org>
5. [ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
7. RESOLV_CONF="/etc/resolv.conf"
8. [ -e $RESOLV_CONF ] || touch $RESOLV_CONF
9. [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
10. [ -n "$subnet" ] && NETMASK="netmask $subnet"
12. case "$1" in
13.         deconfig)
14.                 /sbin/ifconfig $interface up
15.                 /sbin/ifconfig $interface 0.0.0.0
17.                 # drop info from this interface
18.                 # resolv.conf may be a symlink to /tmp/, so take care
19.                 TMPFILE=$(mktemp)
20.                 grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
21.                 cat $TMPFILE > $RESOLV_CONF
22.                 rm -f $TMPFILE
24.                 if [ -x /usr/sbin/avahi-autoipd ]; then
25.                         /usr/sbin/avahi-autoipd -k $interface
26.                 fi
27.                 ;;
29.         leasefail|nak)
30.                 if [ -x /usr/sbin/avahi-autoipd ]; then
31.                         /usr/sbin/avahi-autoipd -wD $interface --no-chroot
32.                 fi
33.                 ;;
35.         renew|bound)
36.                 if [ -x /usr/sbin/avahi-autoipd ]; then
37.                         /usr/sbin/avahi-autoipd -k $interface
38.                 fi
39.                 /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
41.                 if [ -n "$router" ] ; then
42.                         echo "deleting routers"
43.                         while route del default gw 0.0.0.0 dev $interface 2> /dev/null; do
44.                                 :
45.                         done
47.                         for i in $router ; do
48.                                 route add default gw $i dev $interface
49.                         done
50.                 fi
52.                 # drop info from this interface
53.                 # resolv.conf may be a symlink to /tmp/, so take care
54.                 TMPFILE=$(mktemp)
55.                 grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
56.                 cat $TMPFILE > $RESOLV_CONF
57.                 rm -f $TMPFILE
59.                 # prefer rfc3359 domain search list (option 119) if available
60.                 if [ -n "$search" ]; then
61.                         search_list=$search
62.                 elif [ -n "$domain" ]; then
63.                         search_list=$domain
64.                 fi
66.                 [ -n "$search_list" ] &&
67.                         echo "search $search_list # $interface" >> $RESOLV_CONF
69.                 for i in $dns ; do
70.                         echo adding dns $i
71.                         echo "nameserver $i # $interface" >> $RESOLV_CONF
72.                 done
73.                 ;;
74. esac
76. HOOK_DIR="$0.d"
77. for hook in "${HOOK_DIR}/"*; do
78.     [ -f "${hook}" -a -x "${hook}" ] || continue
79.     "${hook}" "${@}"
80. done
82. exit 0

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