大家好，又见面了，我是你们的朋友全栈君。
内核版本：linux-2.6.39
开发板平台：at91sam9x35
wifi模块：rt3070
先说一下wifi的两种常见的模式。
AP模式: Access Point，提供无线接入服务，允许其它无线设备接入，提供数据访问，一般的无线路由/网桥工作在该模式下。AP和AP之间允许相互连接。
Station模式：类似于无线终端，station本身并不接受无线的接入，它可以连接到AP，一般无线网卡即工作在该模式。
hostapd就是使wifi模块工作在AP模式。
一.添加内核对rt3070的支持。
make menuconfig: [*] Networking support —> -*- Wireless —> <*> cfg80211 – wireless configuration API [ ] nl80211 testmode command [ ] enable developer warnings [ ] cfg80211 regulatory debugging [*] enable powersave by default [ ] use statically compiled regulatory rules database [*] cfg80211 wireless extensions compatibility [*] Wireless extensions sysfs files <*> Common routines for IEEE802.11 drivers [ ] lib80211 debugging messages (NEW) <*> Generic IEEE 802.11 Networking Stack (mac80211) [ ] PID controller based rate control algorithm (NEW) [*] Minstrel (NEW) [*] Minstrel 802.11n support (NEW) Default rate control algorithm (Minstrel) —> [ ] Enable mac80211 mesh networking (pre-802.11s) support (NEW) [ ] Select mac80211 debugging features (NEW) —> Device Drivers —> [*] Network device support —> [*] Wireless LAN —> <*> Ralink driver support —> — Ralink driver support < > Ralink rt2500 (USB) support (NEW) < > Ralink rt2501/rt73 (USB) support (NEW) <*> Ralink rt27xx/rt28xx/rt30xx (USB) support [ ] rt2800 usb – Include support for rt33xx devices [ ] rt2800usb – Include support for rt35xx devices (EXPERIMENTAL) (NEW) [ ] rt2800usb – Include support for rt53xx devices (EXPERIMENTAL) (NEW) [ ] rt2800usb – Include support for unknown (USB) devices (NEW) [ ] Ralink debug output (NEW)
hostapd依赖openssl和libnl,所以先移植openssl和libnl
二.编译openssl
编译openssl需要wpa_supplicant里面的patch包 [lingyun@localhost hostapd]wget http://www.openssl.org/source/openssl-0.9.8e.tar.gz [lingyun@localhost hostapd] wget http://hostap.epitest.fi/releases/wpa_supplicant-2.0.tar.gz [lingyun@localhost hostapd] tar -xzf openssl-0.9.8e.tar.gz [lingyun@localhost hostapd] tar -xzf wpa_supplicant-2.0.tar.gz [lingyun@localhost hostapd] cd openssl-0.9.8e [lingyun@localhost openssl-0.9.8e] cp ../wpa_supplicant-2.0/patches/openssl-0.9.8e-tls-extensions.patch . [lingyun@localhost openssl-0.9.8e] patch -p1 < ./openssl-0.9.8e-tls-extensions.patch [lingyun@localhost openssl-0.9.8e]
# CRYPTO_MDEBUG – turns on my ‘memory leak’ detecting stuff # MFUNC – Make all Malloc/Free/Realloc calls call # CRYPTO_malloc/CRYPTO_free/CRYPTO_realloc which can be setup to # call application defined callbacks via CRYPTO_set_mem_functions() # MD5_ASM needs to be defined to use the x86 assembler for MD5 # SHA1_ASM needs to be defined to use the x86 assembler for SHA1 # RMD160_ASM needs to be defined to use the x86 assembler for RIPEMD160 # Do not define B_ENDIAN or L_ENDIAN if ‘unsigned long’ == 8. It must # equal 4. # PKCS1_CHECK – pkcs1 tests.
CROSS=/opt/buildroot-2011.11/arm926t/usr/bin/arm-linux- CC={CROSS}gcc CXX={CROSS}g AR={CROSS}ar (ARFLAGS)r AS={CROSS}as LD={CROSS}ld NM={CROSS}nm RANLIB={CROSS}ranlib STRIP=
INSTALL_PREFIX=
#INSTALLTOP=/usr/local/ssl INSTALLTOP=/home/lingyun/zhouyou/hostapd/install
# Do not edit this manually. Use Configure –openssldir=DIR do change this!
#OPENSSLDIR=/usr/local/ssl OPENSSLDIR=/home/lingyun/zhouyou/hostapd/install
[lingyun@localhost openssl-0.9.8e] sudo make [lingyun@localhost openssl-0.9.8e] sudo make install [lingyun@localhost install]
三.编译libnl
libnl是为了方便应用程序使用netlink接口而开发的一个库。这个库为原始netlink(是用以实现用户进程与内核进程通信的一种特殊的进程间通信(IPC) ,也是网络应用程序与内核通信的最常用的接口)消息传递以及不同的netlink family专用接口提供了一个统一的接口。移植libnl1.1是hostapd的移植的一部分，所以在移植hostapd之前先要移植libnl。
lingyun@localhost hostapd] wgethttp://www.infradead.org/~tgr/libnl/files/libnl-1.1.tar.gz [lingyun@localhost hostapd] tar -zxf libnl-1.1.tar.gz [lingyun@localhost hostapd] cd libnl-1.1 [lingyun@localhost libnl-1.1] ls aclocal.m4 configure.in include libnl-1.pc Makefile.opts.in tests ChangeLog COPYING install-sh libnl-1.pc.in Makefile.rules configure doc lib Makefile src [lingyun@localhost libnl-1.1] ./configure –host=arm –prefix=/home/lingyun/zhouyou/hostapd/install2 [lingyun@localhost libnl-1.1] make CC=/opt/buildroot-2011.11/arm926t/usr/bin/arm-linux-gcc AR=/opt/buildroot-2011.11/arm926t/usr/bin/arm-linux-ar RADNLIB=/opt/buildroot-2011.11/arm926t/usr/bin/randlib STRIP=/opt/buildroot-2011.11/arm926t/usr/bin/arm-linux-strip [lingyun@localhost libnl-1.1]
make后会出现错误:，../include/netlink-local.h:218: error: ‘ULONG_MAX’ undeclared (first use in this function) 解决的方法在include/netlink-local.h里面加一个头文件#include <limits.h>
[lingyun@localhost hostapd]$ ls install2 include lib
将install2/lib/下所有文件拷贝至开发板的/lib目录下，确保hostapd在开发板上运行，能够正确找到libnl库的位置。
四。移植hostapd
[lingyun@localhost hostapd]wget http://hostap.epitest.fi/releases/hostapd-0.7.3.tar.gz [lingyun@localhost hostapd] tar -zxf hostapd-0.7.3.tar.gz [lingyun@localhost hostapd-0.7.3] ls COPYING hostapd patches README src [lingyun@localhost hostapd-0.7.3] cd hostapd/ [lingyun@localhost hostapd] cp defconfig .config [lingyun@localhost hostapd] vim .config
# Driver interface for Host AP driver CONFIG_DRIVER_HOSTAP=y
CROSS = /opt/buidroot-2011.11/arm926t/usr/bin/arm-linux- OPENSSL_PATH=/home/lingyun/zhouyou/hostapd PRJ_TOP=/home/lingyun/zhouyou/hostapd CC={CROSS}gcc CFLAGS =-I{OPENSSL_PATH}/install/include LDFLAGS =-L
# Driver interface for wired authenticator
#CONFIG_DRIVER_WIRED=y
# Driver interface for madwifi driver
#CONFIG_DRIVER_MADWIFI=y
#CFLAGS = -I../../madwifi # change to the madwifi source directory
# Driver interface for drivers using the nl80211 kernel interface
CONFIG_DRIVER_NL80211=y LIBNL={PRJ_TOP}/install2 CFLAGS = -I{LIBNL}/include/ LIBS = -L
# Wi-Fi Protected Setup (WPS)
CONFIG_WPS=y
# Enable UPnP support for external WPS Registrars
# IEEE 802.11n (High Throughput) support
CONFIG_IEEE80211N=y
# a file that usually has extension .p12 or .pfx)
#CONFIG_PKCS12=y
# Build IPv6 support for RADIUS operations
#CONFIG_IPV6=y
[lingyun@localhost hostapd]$ make
make后就会生成hostapd和hostapd_cli
在开发板执行如下命：
~ >: ./hostapd -v hostapd v0.7.3 User space daemon for IEEE 802.11 AP management, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi> and contributors
这就表示hostapd移植成功了
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