為了用mac抓取802.11 ac的空口包，需要用到Mac OS下的配置wifi的工具。找了半天沒有iwconfig/wpa_supplicant命令，但是發現了airport這個命令。雖然不是很熟悉，但值得高興的是可以直接用airport進行抓包。

1.為了方便在終端直接輸入airport命令，首先將工具連結到sbin目錄
sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport

2.檢視airport有哪些命令

Usage: airport <interface> <verb> <options>
 


    <interface>
    If an interface is not specified, airport will use the first AirPort interface on the system.

    <verb is one of the following:
    prefs   If specified with no key value pairs, displays a subset of AirPort preferences for
        the specified interface.

        Preferences may be configured using
 
 key=value syntax. Keys and possible values are specified below.
        Boolean settings may be configured using 'YES' and 'NO'.

        DisconnectOnLogout (Boolean)
        JoinMode (String)
            Automatic
            Preferred
            Ranked
            Recent
            Strongest
        JoinModeFallback (String
 
)
            Prompt
            JoinOpen
            KeepLooking
            DoNothing
        RememberRecentNetworks (Boolean)
        RequireAdmin (Boolean)
        RequireAdminIBSS (Boolean)
        RequireAdminNetworkChange (Boolean)
        RequireAdminPowerToggle (Boolean)
        WoWEnabled (Boolean)

    logger  Monitor the driver's logging facility.

    sniff   If a channel number is specified, airportd will attempt to configure the interface
        to use that channel before it begins sniffing 802.11 frames. Captures files are saved to /tmp.
        Requires super user privileges.

    debug   Enable debug logging. A debug log setting may be enabled by prefixing it with a '+', and disabled
        by prefixing it with a '-'.

        AirPort Userland Debug Flags
            DriverDiscovery
            DriverEvent
            Info
            SystemConfiguration
            UserEvent
            PreferredNetworks
            AutoJoin
            IPC
            Scan
            802.1x
            Assoc
            Keychain
            RSNAuth
            WoW
            P2P
            Roam
            BTCoex
            AllUserland - Enable/Disable all userland debug flags

        AirPort Driver Common Flags
            DriverInfo
            DriverError
            DriverWPA
            DriverScan
            AllDriver - Enable/Disable all driver debug flags

        AirPort Driver Vendor Flags
            VendorAssoc
            VendorConnection
            AllVendor - Enable/Disable all vendor debug flags

        AirPort Global Flags
            LogFile - Save all AirPort logs to /var/log/wifi.log

<options> is one of the following:
    No options currently defined.

Examples:

Configuring preferences (requires admin privileges)
    sudo airport en1 prefs JoinMode=Preferred RememberRecentNetworks=NO RequireAdmin=YES

Sniffing on channel 1:
    airport en1 sniff 1


LEGACY COMMANDS:
Supported arguments:
 -c[<arg>] --channel=[<arg>]    Set arbitrary channel on the card
 -z        --disassociate       Disassociate from any network
 -I        --getinfo            Print current wireless status, e.g. signal info, BSSID, port type etc.
 -s[<arg>] --scan=[<arg>]       Perform a wireless broadcast scan.
                   Will perform a directed scan if the optional <arg> is provided
 -x        --xml                Print info as XML
 -P        --psk                Create PSK from specified pass phrase and SSID.
                   The following additional arguments must be specified with this command:
                                  --password=<arg>  Specify a WPA password
                                  --ssid=<arg>      Specify SSID when creating a PSK
 -h        --help               Show this help

3.其他常用命令（詳細用法根據上面的命令說明可以知道，這裡只列出，不贅述了）：

~ $ airport -I  // 檢視網絡卡資訊，相當於iwconfig
~ $ airport -s  // 掃描
~ $ sudo airport -c1  // 固定wifi通道到1通道，wireshark抓包時會用到
~ $ airport -z //  解關聯
~ $ airport en1 sniff 1  // 用airport在1通道監聽抓包，Captures files are saved to /tmp

4.在Mac OS下用wireshark抓wifi空口包

5.參考文章：