#创作者激励# #跟着小白一起学鸿蒙# WPA_Supplicant连接方式简析 原创 精华
左翼风发
发布于 2023-3-15 18:26
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【本文正在参加2023年第一期优质创作者激励计划】
WPA_Supplicant连接方式简析
/third_party/wpa_supplicant
|-- CONTRIBUTIONS # 贡献说明
|-- COPYING # 版权说明
|-- wpa_supplicant-2.9 # 轻量级系统的wpa_supplicant
| |-- hostapd # Wi-Fi热点相关功能（Access Point）
| |-- hs20 # 热点2.0（Hotspot2.0）相关功能
| |-- src # Wi-Fi热点与Wi-Fi接入点共用的代码
| |-- wpa_supplicant # Wi-Fi接入相关功能（Station）
| `-- wpa_supplicant_lib # OpenHarmony对Wi-Fi新开发的业务代码
`-- wpa_supplicant-2.9_standard # 标准系统的wpa_supplicant
| |-- hostapd # Wi-Fi热点相关功能（Access Point）
| |-- hs20 # 热点2.0（Hotspot2.0）相关功能
| |-- src # Wi-Fi热点与Wi-Fi接入点共用的代码
| |-- wpa_supplicant # Wi-Fi接入相关功能（Station）
| `-- wpa_supplicant_lib # OpenHarmony对Wi-Fi新开发的业务代码
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WPA_Supplicant支持的连接方式
struct wpa_ctrl { #ifdef CONFIG_CTRL_IFACE_UDP int s; #ifdef CONFIG_CTRL_IFACE_UDP_IPV6 struct sockaddr_in6 local; struct sockaddr_in6 dest; #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */ struct sockaddr_in local; struct sockaddr_in dest; #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */ char *cookie; char *remote_ifname; char *remote_ip; #endif /* CONFIG_CTRL_IFACE_UDP */ #ifdef CONFIG_CTRL_IFACE_UNIX int s; struct sockaddr_un local; struct sockaddr_un dest; #endif /* CONFIG_CTRL_IFACE_UNIX */ #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE HANDLE pipe; #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */ };在以上的结构体定义里我们可以看到一共定义了4个宏定义标明4中wpa_supplicant
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CONFIG_CTRL_IFACE_UDP
使用ipv4 socket接口与client进行连接和通讯，默认使用localhost（127.0.0.1）
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CONFIG_CTRL_IFACE_UDP_IPV6
使用ipv6 socket接口与client进行连接和通讯，默认使用localhost（::1）
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CONFIG_CTRL_IFACE_UNIX
使用unix socket接口与client进行连接和通讯，是Linux和*BSD的默认配置，默认在linux系统使用/var/run/wpa_supplicant，在android系统使用/data/misc/wifi/sockets
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CONFIG_CTRL_IFACE_NAMED_PIPE
使用Windows Named Pipe模式与client进行连接和通讯，是windows的默认配置
TCP/IP Socket 和 Unix Socket最大的区别就是unix-socket没有port，使用文件handle作为传输对象，但是只能在同物理主机内运行，相对ip-socket速度也更快，有人验证过unix-socket要比ip-socket快31%
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WPA_Supplicant的控制接口
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关wifi时：
# ps -A | grep wifi 497 ? 00:00:04 wifi_hal_servic 543 ? 00:00:00 wifi_host 629 ? 00:01:58 wifi_manager_se # netstat -axp | grep wifi unix 2 [ ACC ] STREAM LISTENING 2951369 25629/ohos.sample.w@25629ohos.sample.wifitest unix 2 [ ACC ] STREAM LISTENING 18673 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock unix 2 [ ] DGRAM 18851 543/wifi_host unix 2 [ ] DGRAM 18672 497/wifi_hal_servic unix 2 [ ] DGRAM 19185 629/wifi_manager_se -
开wifi时：
# ps -A | grep wifi 497 ? 00:00:04 wifi_hal_servic 543 ? 00:00:00 wifi_host 629 ? 00:01:58 wifi_manager_se 779 ? 00:00:01 wifi_hal_servic # netstat -axp | grep wifi unix 2 [ ACC ] STREAM LISTENING 2951369 25629/ohos.sample.w@25629ohos.sample.wifitest unix 2 [ ACC ] STREAM LISTENING 18673 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock unix 3 [ ] STREAM CONNECTED 3165678 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock unix 3 [ ] STREAM CONNECTED 3167635 629/wifi_manager_se unix 2 [ ] DGRAM 18851 543/wifi_host unix 2 [ ] DGRAM 18672 497/wifi_hal_servic unix 3 [ ] STREAM CONNECTED 3167636 629/wifi_manager_se unix 2 [ ] DGRAM 19185 629/wifi_manager_se unix 3 [ ] STREAM CONNECTED 3167634 629/wifi_manager_se unix 3 [ ] STREAM CONNECTED 3165679 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock unix 3 [ ] STREAM CONNECTED 3165020 629/wifi_manager_se unix 3 [ ] STREAM CONNECTED 3167645 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock unix 3 [ ] STREAM CONNECTED 3165700 497/wifi_hal_servic/data/service/el1/public/wifi/unix_sock.sock
《简析OpenHarmony的WiFi能力》大概介绍过OpenHarmony里的WiFi架构，对应上面的命令行可以看出，wifi在后台启动了3个服务
- wifi_manager_service：wifi服务层，为wifi框架层服务，对下通过wpa_hal与wpa_hal_service通信；
- wifi_host：wlan启动的设备服务，对应vendor/hihope/rk3568/hdf_config/uhdf/device_info.hcs，
- wifi_hal_service：wifi 硬件抽象服务，对应加载wpa_supplicant，与hdf进行交互，对上提供wpa_client.so
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客户端
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wpa_supplicant提供两种客户端：
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wpa_cli：用于和wpa_supplicant交互；使用wpa_cli可以实现wifi的具体功能
# wpa_cli -i wlan0 scan wpa_ctrl_request cmd: GET_COOKIE wpa_ctrl_request cmd: IFNAME wpa_ctrl_request cmd: SCAN OK # wpa_cli -i wlan0 scan_result wpa_ctrl_request cmd: GET_COOKIE wpa_ctrl_request cmd: IFNAME wpa_ctrl_request cmd: SCAN_RESULTS bssid / frequency / signal level / flags / ssid / informationElements 6e:b1:58:65:63:67 5805 -39 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] [7 434e2024042395052300][61 a1070000000000000000000000000000000000000000][192 019b00faff] 6c:b1:58:75:63:67 5805 -39 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] TP-LINK_6365 [7 434e2024042395052300][61 a1070000000000000000000000000000000000000000][192 019b00faff] f4:84:8d:01:69:ac 5785 -51 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] Graphic [7 434e2024042395052300][61 9d050400000000000000000000000000000000000000][192 019b00faff] f6:84:8d:21:69:ac 5785 -52 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] [7 434e2024042395052300][61 9d050400000000000000000000000000000000000000][192 019b00faff] f2:45:21:15:5e:75 5745 -60 [WPA2-PSK+SAE-CCMP][SAE-H2E][ESS] iPhone 13 Pro Max [7 434e202401172801172c01173001173401173801173c011740011795011b99011b9d011ba1011ba5011b][61 95050400000000000000000000000000000000000000][192 019b000000] f8:af:05:87:7a:40 5180 -74 [WPA2-PSK-CCMP][WPS][ESS] dist [61 240d0400000000000000000000000000000000000000][192 012a00faff] f8:af:05:f7:7a:40 5180 -74 [WPA2-PSK-CCMP][WPS][ESS] [61 240d0000000000000000000000000000000000000000][192 012a00faff] f8:af:05:87:7a:42 5180 -71 [WPA2-PSK-CCMP][WPS][ESS] [61 240d0000000000000000000000000000000000000000][192 012a00faff] 6c:b1:58:75:63:65 2462 -40 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] TP-LINK_6365 [7 434e20010d1b][61 0b070000000000000000000000000000000000000000] 6e:b1:58:65:63:65 2462 -40 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] [7 434e20010d1b][61 0b070000000000000000000000000000000000000000] f4:84:8d:01:69:aa 2437 -47 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] Graphic [7 434e20010d14][61 06070000000000000000000000000000000000000000] f6:84:8d:01:69:aa 2437 -46 [WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS] [7 434e20010d14][61 06070000000000000000000000000000000000000000]对应的主要功能：
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wpa_ctrl_open() ： 连接WPAS的控制接口, 可以是WPAS的全局控制接口，也可以是为每一个无线网络接口指定的控制接口
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wpa_ctrl_close() : 关闭wpa_ctrl_open()打开的连接
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wpa_ctrl_request() : 通过建立的连接向WPAS发送消息
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wpa_ctrl_attach() : 使用wpa_ctrl_open()建立的连接， WPAS默认不会向这些连接的client端发送event， 必须显示调用wpa_ctrl_attach()，才能接收到消息
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wpa_ctrl_detach() : 取消wpa_ctrl_attach()
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wpa_ctrl_recv() : 接收WPAS端发来的event， 必须要先在打开的连接上调用wpa_ctrl_attach()才能接收到event， 当无event可读时， 此调用会被block住
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wpa_ctrl_pending() : 检查是否有pending的event， 若有则可以调用wpa_ctrl_recv()来接收
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wpa_ctrl_get_fd() : 获取同WPAS的连接中， client端的fd， 获取的fd可以用于select， epoll等， 但是不能直接用于收发消息， 必须使用wpa_ctrl_request()和wpa_ctrl_recv（）
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wpa_ctrl_cleanup() : 当使用unix socekt 进行连接时，会建立socket文件， 若其carsh， 则会遗留这些文件， wpa_ctrl_cleanup()用于清理这些文件
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hostapd_cli：用于和hostapd交互；（当设置wlan为ap模式时候可以使用此功能）
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服务端
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wpa_supplicant提供两种服务端：
- wpa_supplicant：Wi-Fi接入相关功能，对应wifi_hal_sta_interface.c启动或停止，此文件在wifi的services层，对应之前的wifi_hal_service；这也解释了为啥开wifi后会多出一个wifi_hal_service
- hostapd：Wi-Fi热点相关功能，对应wifi_hal_ap_interface.c启动或停止，此文件在wifi的services层，对应之前的wifi_hal_service；
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对应配置文件：
# ls ./system/etc/wifi/ hostapd.conf p2p_supplicant.conf wpa_supplicant.conf //热点配置 # cat ./system/etc/wifi/hostapd.conf # Copyright (C) 2022 Huawei Device Co., Ltd. # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. interface=wlan0 ctrl_interface=udp ssid=testap hw_mode=g channel=1 //点对点传输模式 # cat ./system/etc/wifi/p2p_supplicant.conf # Copyright (C) 2022 Huawei Device Co., Ltd. # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. ctrl_interface=udp device_name=p2p_ohos manufacturer=ohos device_type=10-0050F204-5 config_methods=virtual_push_button physical_display keypad p2p_listen_reg_class=81 p2p_listen_channel=1 p2p_oper_reg_class=81 p2p_oper_channel=1 p2p_go_intent=0 persistent_reconnect=1 serial_number=0123456789ABCDEF p2p_ssid_postfix=-ohos p2p_go_ht40=1 p2p_go_vht=1 update_config=1 //默认的接入点模式 # cat ./system/etc/wifi/wpa_supplicant.conf # Copyright (C) 2021 Huawei Device Co., Ltd. # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. country=GB ctrl_interface=udp network={ }此处多了个p2p的配置，其实就是wpa_supplicat启动时候使用的不同配置，也就是说wpa_supplicant可以作为接入点模式启动也可以作为p2p模式启动。
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小结
以上就是对OpenHarmony里的wap_supplicant的大概分析，具体代码分析可以自己搜索wap_supplicant的相关文章。
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已于2023-3-30 11:10:23修改
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功能说明的很清楚，先收藏一波
关注下应用层下的东西
功能基本都介绍了，学习了