arm环境下，wpa_supplicant交叉编译+wifista连接详解

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 配合使用，用于管理 WiFi 连接。本文讲解wpa_supplicant 交叉编译全过程以及开发板使用wpa_supplican和udhcpc连接wifi全过程详解。

2、前期准备

虚拟机：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交叉编译

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编译生成的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 ./config no-asm shared --prefix=$PWD/_install --cross-compile-prefix=arm-gcc7.3-linux-musleabi- make CC=arm-gcc7.3-linux-musleabi-gcc make install

需要注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目录下生成的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 ./configure --host=arm-gcc7.3-linux-musleabi --prefix=$PWD/_install make install

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，当然也可以用他的默认配置

使用默认配置：

cp defconfig .config

裁剪后的配置文件.config

# Example wpa_supplicant build time configuration # # This file lists the configuration options that are used when building the # hostapd binary. All lines starting with # are ignored. Configuration option # lines must be commented out complete, if they are not to be included, i.e., # just setting VARIABLE=n is not disabling that variable. # # This file is included in Makefile, so variables like CFLAGS and LIBS can also # be modified from here. In most cases, these lines should use += in order not # to override previous values of the variables. BOARD_WIFI_VENDOR=realtek # Uncomment following two lines and fix the paths if you have installed OpenSSL # or GnuTLS in non-default location #CFLAGS += -I/usr/local/openssl/include #LIBS += -L/usr/local/openssl/lib # Some Red Hat versions seem to include kerberos header files from OpenSSL, but # the kerberos files are not in the default include path. Following line can be # used to fix build issues on such systems (krb5.h not found). #CFLAGS += -I/usr/include/kerberos # Driver interface for generic Linux wireless extensions # Note: WEXT is deprecated in the current Linux kernel version and no new # functionality is added to it. nl80211-based interface is the new # replacement for WEXT and its use allows wpa_supplicant to properly control # the driver to improve existing functionality like roaming and to support new # functionality. #CONFIG_DRIVER_WEXT=y # Driver interface for Linux drivers using the nl80211 kernel interface CONFIG_DRIVER_NL80211=y # QCA vendor extensions to nl80211 #CONFIG_DRIVER_NL80211_QCA=y # driver_nl80211.c requires libnl. If you are compiling it yourself # you may need to point hostapd to your version of libnl. # #CFLAGS += -I$<path to libnl include files> #LIBS += -L$<path to libnl library files> # Use libnl v2.0 (or 3.0) libraries. #CONFIG_LIBNL20=y # Use libnl 3.2 libraries (if this is selected, CONFIG_LIBNL20 is ignored) #CONFIG_LIBNL32=y # Driver interface for FreeBSD net80211 layer (e.g., Atheros driver) #CONFIG_DRIVER_BSD=y #CFLAGS += -I/usr/local/include #LIBS += -L/usr/local/lib #LIBS_p += -L/usr/local/lib #LIBS_c += -L/usr/local/lib # Driver interface for Windows NDIS #CONFIG_DRIVER_NDIS=y #CFLAGS += -I/usr/include/w32api/ddk #LIBS += -L/usr/local/lib # For native build using mingw #CONFIG_NATIVE_WINDOWS=y # Additional directories for cross-compilation on Linux host for mingw target #CFLAGS += -I/opt/mingw/mingw32/include/ddk #LIBS += -L/opt/mingw/mingw32/lib #CC=mingw32-gcc # By default, driver_ndis uses WinPcap for low-level operations. This can be # replaced with the following option which replaces WinPcap calls with NDISUIO. # However, this requires that WZC is disabled (net stop wzcsvc) before starting # wpa_supplicant. # CONFIG_USE_NDISUIO=y # Driver interface for wired Ethernet drivers #CONFIG_DRIVER_WIRED=y # Driver interface for the Broadcom RoboSwitch family #CONFIG_DRIVER_ROBOSWITCH=y # Driver interface for no driver (e.g., WPS ER only) #CONFIG_DRIVER_NONE=y # Solaris libraries #LIBS += -lsocket -ldlpi -lnsl #LIBS_c += -lsocket # Enable IEEE 802.1X Supplicant (automatically included if any EAP method is # included) CONFIG_IEEE8021X_EAPOL=y # EAP-MD5 CONFIG_EAP_MD5=y # EAP-MSCHAPv2 CONFIG_EAP_MSCHAPV2=y # EAP-TLS CONFIG_EAP_TLS=y # EAL-PEAP CONFIG_EAP_PEAP=y # EAP-TTLS CONFIG_EAP_TTLS=y # EAP-FAST # Note: If OpenSSL is used as the TLS library, OpenSSL 1.0 or newer is needed # for EAP-FAST support. Older OpenSSL releases would need to be patched, e.g., # with openssl-0.9.8x-tls-extensions.patch, to add the needed functions. # CONFIG_EAP_FAST=y # EAP-GTC CONFIG_EAP_GTC=y # EAP-OTP CONFIG_EAP_OTP=y # EAP-SIM (enable CONFIG_PCSC, if EAP-SIM is used) # CONFIG_EAP_SIM=y # EAP-PSK (experimental; this is _not_ needed for WPA-PSK) #CONFIG_EAP_PSK=y # EAP-pwd (secure authentication using only a password) #CONFIG_EAP_PWD=y # EAP-PAX #CONFIG_EAP_PAX=y # LEAP CONFIG_EAP_LEAP=y # EAP-AKA (enable CONFIG_PCSC, if EAP-AKA is used) # CONFIG_EAP_AKA=y # EAP-AKA' (enable CONFIG_PCSC, if EAP-AKA' is used). # This requires CONFIG_EAP_AKA to be enabled, too. # CONFIG_EAP_AKA_PRIME=y # Enable USIM simulator (Milenage) for EAP-AKA #CONFIG_USIM_SIMULATOR=y # EAP-SAKE #CONFIG_EAP_SAKE=y # EAP-GPSK #CONFIG_EAP_GPSK=y # Include support for optional SHA256 cipher suite in EAP-GPSK #CONFIG_EAP_GPSK_SHA256=y # EAP-TNC and related Trusted Network Connect support (experimental) #CONFIG_EAP_TNC=y # Wi-Fi Protected Setup (WPS) # CONFIG_WPS=y # Enable WPS external registrar functionality # CONFIG_WPS_ER=y # Disable credentials for an open network by default when acting as a WPS # registrar. #CONFIG_WPS_REG_DISABLE_OPEN=y # Enable WPS support with NFC config method # CONFIG_WPS_NFC=y # EAP-IKEv2 #CONFIG_EAP_IKEV2=y # EAP-EKE #CONFIG_EAP_EKE=y # PKCS#12 (PFX) support (used to read private key and certificate file from # a file that usually has extension .p12 or .pfx) CONFIG_PKCS12=y # Smartcard support (i.e., private key on a smartcard), e.g., with openssl # engine. CONFIG_SMARTCARD=y # PC/SC interface for smartcards (USIM, GSM SIM) # Enable this if EAP-SIM or EAP-AKA is included #CONFIG_PCSC=y # Support HT overrides (disable HT/HT40, mask MCS rates, etc.) #CONFIG_HT_OVERRIDES=y # Support VHT overrides (disable VHT, mask MCS rates, etc.) #CONFIG_VHT_OVERRIDES=y # Development testing #CONFIG_EAPOL_TEST=y # Select control interface backend for external programs, e.g, wpa_cli: # unix = UNIX domain sockets (default for Linux/*BSD) # udp = UDP sockets using localhost (127.0.0.1) # udp6 = UDP IPv6 sockets using localhost (::1) # named_pipe = Windows Named Pipe (default for Windows) # udp-remote = UDP sockets with remote access (only for tests systems/purpose) # udp6-remote = UDP IPv6 sockets with remote access (only for tests purpose) # y = use default (backwards compatibility) # If this option is commented out, control interface is not included in the # build. CONFIG_CTRL_IFACE=y # Include support for GNU Readline and History Libraries in wpa_cli. # When building a wpa_cli binary for distribution, please note that these # libraries are licensed under GPL and as such, BSD license may not apply for # the resulting binary. #CONFIG_READLINE=y # Include internal line edit mode in wpa_cli. This can be used as a replacement # for GNU Readline to provide limited command line editing and history support. # CONFIG_WPA_CLI_EDIT=y # Remove debugging code that is printing out debug message to stdout. # This can be used to reduce the size of the wpa_supplicant considerably # if debugging code is not needed. The size reduction can be around 35% # (e.g., 90 kB). #CONFIG_NO_STDOUT_DEBUG=y # Remove WPA support, e.g., for wired-only IEEE 802.1X supplicant, to save # 35-50 kB in code size. #CONFIG_NO_WPA=y # Remove IEEE 802.11i/WPA-Personal ASCII passphrase support # This option can be used to reduce code size by removing support for # converting ASCII passphrases into PSK. If this functionality is removed, the # PSK can only be configured as the 64-octet hexstring (e.g., from # wpa_passphrase). This saves about 0.5 kB in code size. #CONFIG_NO_WPA_PASSPHRASE=y # Disable scan result processing (ap_mode=1) to save code size by about 1 kB. # This can be used if ap_scan=1 mode is never enabled. #CONFIG_NO_SCAN_PROCESSING=y # Select configuration backend: # file = text file (e.g., wpa_supplicant.conf; note: the configuration file # path is given on command line, not here; this option is just used to # select the backend that allows configuration files to be used) # winreg = Windows registry (see win_example.reg for an example) CONFIG_BACKEND=file # Remove configuration write functionality (i.e., to allow the configuration # file to be updated based on runtime configuration changes). The runtime # configuration can still be changed, the changes are just not going to be # persistent over restarts. This option can be used to reduce code size by # about 3.5 kB. #CONFIG_NO_CONFIG_WRITE=y # Remove support for configuration blobs to reduce code size by about 1.5 kB. #CONFIG_NO_CONFIG_BLOBS=y # Select program entry point implementation: # main = UNIX/POSIX like main() function (default) # main_winsvc = Windows service (read parameters from registry) # main_none = Very basic example (development use only) #CONFIG_MAIN=main # Select wrapper for operating system and C library specific functions # unix = UNIX/POSIX like systems (default) # win32 = Windows systems # none = Empty template # CONFIG_OS=unix # Select event loop implementation # eloop = select() loop (default) # eloop_win = Windows events and WaitForMultipleObject() loop # CONFIG_ELOOP=eloop # Should we use poll instead of select? Select is used by default. #CONFIG_ELOOP_POLL=y # Should we use epoll instead of select? Select is used by default. #CONFIG_ELOOP_EPOLL=y # Should we use kqueue instead of select? Select is used by default. #CONFIG_ELOOP_KQUEUE=y # Select layer 2 packet implementation # linux = Linux packet socket (default) # pcap = libpcap/libdnet/WinPcap # freebsd = FreeBSD libpcap # winpcap = WinPcap with receive thread # ndis = Windows NDISUIO (note: requires CONFIG_USE_NDISUIO=y) # none = Empty template # CONFIG_L2_PACKET=linux # Disable Linux packet socket workaround applicable for station interface # in a bridge for EAPOL frames. This should be uncommented only if the kernel # is known to not have the regression issue in packet socket behavior with # bridge interfaces (commit 'bridge: respect RFC2863 operational state')'). #CONFIG_NO_LINUX_PACKET_SOCKET_WAR=y # PeerKey handshake for Station to Station Link (IEEE 802.11e DLS) CONFIG_PEERKEY=y # IEEE 802.11w (management frame protection), also known as PMF # Driver support is also needed for IEEE 802.11w. # CONFIG_IEEE80211W=y # Select TLS implementation # openssl = OpenSSL (default) # gnutls = GnuTLS # internal = Internal TLSv1 implementation (experimental) # none = Empty template CONFIG_TLS=internal # TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.1) # can be enabled to get a stronger construction of messages when block ciphers # are used. It should be noted that some existing TLS v1.0 -based # implementation may not be compatible with TLS v1.1 message (ClientHello is # sent prior to negotiating which version will be used) #CONFIG_TLSV11=y # TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.2) # can be enabled to enable use of stronger crypto algorithms. It should be # noted that some existing TLS v1.0 -based implementation may not be compatible # with TLS v1.2 message (ClientHello is sent prior to negotiating which version # will be used) #CONFIG_TLSV12=y # If CONFIG_TLS=internal is used, additional library and include paths are # needed for LibTomMath. Alternatively, an integrated, minimal version of # LibTomMath can be used. See beginning of libtommath.c for details on benefits # and drawbacks of this option. CONFIG_INTERNAL_LIBTOMMATH=y #ifndef CONFIG_INTERNAL_LIBTOMMATH #LTM_PATH=/usr/src/libtommath-0.39 #CFLAGS += -I$(LTM_PATH) #LIBS += -L$(LTM_PATH) #LIBS_p += -L$(LTM_PATH) #endif # At the cost of about 4 kB of additional binary size, the internal LibTomMath # can be configured to include faster routines for exptmod, sqr, and div to # speed up DH and RSA calculation considerably #CONFIG_INTERNAL_LIBTOMMATH_FAST=y # Include NDIS event processing through WMI into wpa_supplicant/wpasvc. # This is only for Windows builds and requires WMI-related header files and # WbemUuid.Lib from Platform SDK even when building with MinGW. #CONFIG_NDIS_EVENTS_INTEGRATED=y #PLATFORMSDKLIB="/opt/Program Files/Microsoft Platform SDK/Lib" # Add support for old DBus control interface # (fi.epitest.hostap.WPASupplicant) #CONFIG_CTRL_IFACE_DBUS=y # Add support for new DBus control interface # (fi.w1.hostap.wpa_supplicant1) #CONFIG_CTRL_IFACE_DBUS_NEW=y # Add introspection support for new DBus control interface #CONFIG_CTRL_IFACE_DBUS_INTRO=y # Add support for loading EAP methods dynamically as shared libraries. # When this option is enabled, each EAP method can be either included # statically (CONFIG_EAP_<method>=y) or dynamically (CONFIG_EAP_<method>=dyn). # Dynamic EAP methods are build as shared objects (eap_*.so) and they need to # be loaded in the beginning of the wpa_supplicant configuration file # (see load_dynamic_eap parameter in the example file) before being used in # the network blocks. # # Note that some shared parts of EAP methods are included in the main program # and in order to be able to use dynamic EAP methods using these parts, the # main program must have been build with the EAP method enabled (=y or =dyn). # This means that EAP-TLS/PEAP/TTLS/FAST cannot be added as dynamic libraries # unless at least one of them was included in the main build to force inclusion # of the shared code. Similarly, at least one of EAP-SIM/AKA must be included # in the main build to be able to load these methods dynamically. # # Please also note that using dynamic libraries will increase the total binary # size. Thus, it may not be the best option for targets that have limited # amount of memory/flash. #CONFIG_DYNAMIC_EAP_METHODS=y # IEEE Std 802.11r-2008 (Fast BSS Transition) # CONFIG_IEEE80211R=y # Add support for writing debug log to a file (/tmp/wpa_supplicant-log-#.txt) # CONFIG_DEBUG_FILE=y # Send debug messages to syslog instead of stdout #CONFIG_DEBUG_SYSLOG=y # Set syslog facility for debug messages #CONFIG_DEBUG_SYSLOG_FACILITY=LOG_DAEMON # Add support for sending all debug messages (regardless of debug verbosity) # to the Linux kernel tracing facility. This helps debug the entire stack by # making it easy to record everything happening from the driver up into the # same file, e.g., using trace-cmd. #CONFIG_DEBUG_LINUX_TRACING=y # Add support for writing debug log to Android logcat instead of standard # output # CONFIG_ANDROID_LOG=y # Enable privilege separation (see README 'Privilege separation' for details) #CONFIG_PRIVSEP=y # Enable mitigation against certain attacks against TKIP by delaying Michael # MIC error reports by a random amount of time between 0 and 60 seconds #CONFIG_DELAYED_MIC_ERROR_REPORT=y # Enable tracing code for developer debugging # This tracks use of memory allocations and other registrations and reports # incorrect use with a backtrace of call (or allocation) location. #CONFIG_WPA_TRACE=y # For BSD, uncomment these. #LIBS += -lexecinfo #LIBS_p += -lexecinfo #LIBS_c += -lexecinfo # Use libbfd to get more details for developer debugging # This enables use of libbfd to get more detailed symbols for the backtraces # generated by CONFIG_WPA_TRACE=y. #CONFIG_WPA_TRACE_BFD=y # For BSD, uncomment these. #LIBS += -lbfd -liberty -lz #LIBS_p += -lbfd -liberty -lz #LIBS_c += -lbfd -liberty -lz # wpa_supplicant depends on strong random number generation being available # from the operating system. os_get_random() function is used to fetch random # data when needed, e.g., for key generation. On Linux and BSD systems, this # works by reading /dev/urandom. It should be noted that the OS entropy pool # needs to be properly initialized before wpa_supplicant is started. This is # important especially on embedded devices that do not have a hardware random # number generator and may by default start up with minimal entropy available # for random number generation. # # As a safety net, wpa_supplicant is by default trying to internally collect # additional entropy for generating random data to mix in with the data fetched # from the OS. This by itself is not considered to be very strong, but it may # help in cases where the system pool is not initialized properly. However, it # is very strongly recommended that the system pool is initialized with enough # entropy either by using hardware assisted random number generator or by # storing state over device reboots. # # wpa_supplicant can be configured to maintain its own entropy store over # restarts to enhance random number generation. This is not perfect, but it is # much more secure than using the same sequence of random numbers after every # reboot. This can be enabled with -e<entropy file> command line option. The # specified file needs to be readable and writable by wpa_supplicant. # # If the os_get_random() is known to provide strong random data (e.g., on # Linux/BSD, the board in question is known to have reliable source of random # data from /dev/urandom), the internal wpa_supplicant random pool can be # disabled. This will save some in binary size and CPU use. However, this # should only be considered for builds that are known to be used on devices # that meet the requirements described above. #CONFIG_NO_RANDOM_POOL=y # IEEE 802.11n (High Throughput) support (mainly for AP mode) CONFIG_IEEE80211N=y # IEEE 802.11ac (Very High Throughput) support (mainly for AP mode) # (depends on CONFIG_IEEE80211N) #CONFIG_IEEE80211AC=y # Wireless Network Management (IEEE Std 802.11v-2011) # Note: This is experimental and not complete implementation. # CONFIG_WNM=y # Interworking (IEEE 802.11u) # This can be used to enable functionality to improve interworking with # external networks (GAS/ANQP to learn more about the networks and network # selection based on available credentials). # CONFIG_INTERWORKING=y # Hotspot 2.0 # CONFIG_HS20=y # Enable interface matching in wpa_supplicant #CONFIG_MATCH_IFACE=y # Disable roaming in wpa_supplicant # CONFIG_NO_ROAMING=y # AP mode operations with wpa_supplicant # This can be used for controlling AP mode operations with wpa_supplicant. It # should be noted that this is mainly aimed at simple cases like # WPA2-Personal while more complex configurations like WPA2-Enterprise with an # external RADIUS server can be supported with hostapd. # CONFIG_AP=y # P2P (Wi-Fi Direct) # This can be used to enable P2P support in wpa_supplicant. See README-P2P for # more information on P2P operations. # CONFIG_P2P=y # Enable TDLS support # CONFIG_TDLS=y # Wi-Fi Direct # This can be used to enable Wi-Fi Direct extensions for P2P using an external # program to control the additional information exchanges in the messages. # CONFIG_WIFI_DISPLAY=y # Autoscan # This can be used to enable automatic scan support in wpa_supplicant. # See wpa_supplicant.conf for more information on autoscan usage. # # Enabling directly a module will enable autoscan support. # For exponential module: #CONFIG_AUTOSCAN_EXPONENTIAL=y # For periodic module: #CONFIG_AUTOSCAN_PERIODIC=y # Password (and passphrase, etc.) backend for external storage # These optional mechanisms can be used to add support for storing passwords # and other secrets in external (to wpa_supplicant) location. This allows, for # example, operating system specific key storage to be used # # External password backend for testing purposes (developer use) #CONFIG_EXT_PASSWORD_TEST=y # Enable Fast Session Transfer (FST) #CONFIG_FST=y # Enable CLI commands for FST testing #CONFIG_FST_TEST=y # OS X builds. This is only for building eapol_test. #CONFIG_OSX=y # Automatic Channel Selection # This will allow wpa_supplicant to pick the channel automatically when channel # is set to "0". # # TODO: Extend parser to be able to parse "channel=acs_survey" as an alternative # to "channel=0". This would enable us to eventually add other ACS algorithms in # similar way. # # Automatic selection is currently only done through initialization, later on # we hope to do background checks to keep us moving to more ideal channels as # time goes by. ACS is currently only supported through the nl80211 driver and # your driver must have survey dump capability that is filled by the driver # during scanning. # # TODO: In analogy to hostapd be able to customize the ACS survey algorithm with # a newly to create wpa_supplicant.conf variable acs_num_scans. # # Supported ACS drivers: # * ath9k # * ath5k # * ath10k # # For more details refer to: # http://wireless.kernel.org/en/users/Documentation/acs #CONFIG_ACS=y # Support Multi Band Operation #CONFIG_MBO=y #CONFIG_MESH=y

好了之后设置一下pkg文件的环境变量

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

然后

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

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

CFLAGS += -I/share/test/wpa/libnl-3.11.0/_install/include/libnl3/ LIBS += -L/share/test/wpa/libnl-3.11.0/_install/lib # /share/test/wpa/libnl-3.11.0/_install libnl库install路径 4、arm环境使用  整体步骤：

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

注意点：

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

ctrl_interface=/var/run/wpa_supplicant update_config=1 network={ ssid="iphone30promax" psk="12345678" scan_ssid=1 }

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：

#!/bin/sh # udhcpc script edited by Tim Riker <Tim@Rikers.org> [ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1 RESOLV_CONF="/etc/resolv.conf" [ -e $RESOLV_CONF ] || touch $RESOLV_CONF [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast" [ -n "$subnet" ] && NETMASK="netmask $subnet" case "$1" in deconfig) /sbin/ifconfig $interface up /sbin/ifconfig $interface 0.0.0.0 # drop info from this interface # resolv.conf may be a symlink to /tmp/, so take care TMPFILE=$(mktemp) grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE cat $TMPFILE > $RESOLV_CONF rm -f $TMPFILE if [ -x /usr/sbin/avahi-autoipd ]; then /usr/sbin/avahi-autoipd -k $interface fi ;; leasefail|nak) if [ -x /usr/sbin/avahi-autoipd ]; then /usr/sbin/avahi-autoipd -wD $interface --no-chroot fi ;; renew|bound) if [ -x /usr/sbin/avahi-autoipd ]; then /usr/sbin/avahi-autoipd -k $interface fi /sbin/ifconfig $interface $ip $BROADCAST $NETMASK if [ -n "$router" ] ; then echo "deleting routers" while route del default gw 0.0.0.0 dev $interface 2> /dev/null; do : done for i in $router ; do route add default gw $i dev $interface done fi # drop info from this interface # resolv.conf may be a symlink to /tmp/, so take care TMPFILE=$(mktemp) grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE cat $TMPFILE > $RESOLV_CONF rm -f $TMPFILE # prefer rfc3359 domain search list (option 119) if available if [ -n "$search" ]; then search_list=$search elif [ -n "$domain" ]; then search_list=$domain fi [ -n "$search_list" ] && echo "search $search_list # $interface" >> $RESOLV_CONF for i in $dns ; do echo adding dns $i echo "nameserver $i # $interface" >> $RESOLV_CONF done ;; esac HOOK_DIR="$0.d" for hook in "${HOOK_DIR}/"*; do [ -f "${hook}" -a -x "${hook}" ] || continue "${hook}" "${@}" done exit 0

这几个文件我都已经上传到我的gitee。

希望我的文章有帮助到你。