wpa_cli工具的使用方法及分析

wpa_cli 的使用方法

在Android中有wpa_cli工具能够直接可wpa_supplicant通讯。能够查看一些wifi的信息。
使用方法：wpa_cli -i wlan0 -p /data/misc/wifi/sockets

wpa_cli源码分析

int main(int argc, char *argv[])
{···for (;;) {c = getopt(argc, argv, "a:Bg:G:hi:p:P:s:v");if (c < 0)break;switch (c) {case 'a':action_file = optarg;break;case 'B':daemonize = 1;break;case 'g':global = optarg;break;case 'G':ping_interval = atoi(optarg);break;case 'h':usage();return 0;case 'v':printf("%s\n", wpa_cli_version);return 0;case 'i':os_free(ctrl_ifname);ctrl_ifname = os_strdup(optarg);break;case 'p':ctrl_iface_dir = optarg;break;case 'P':pid_file = optarg;break;case 's':client_socket_dir = optarg;break;default:usage();return -1;}}···if (interactive) {wpa_cli_interactive();}···
···
}

在main函数里面主要就是从命令行中读取参数。之后就是调用wpa_cli_interactive进行建立与supplicant通信的socket，通过读取stdin中的命令与用户进行交互。

static void wpa_cli_interactive(void)
{printf("\nInteractive mode\n\n");eloop_register_timeout(0, 0, try_connection, NULL, NULL);eloop_run();eloop_cancel_timeout(try_connection, NULL, NULL);cli_txt_list_flush(&p2p_peers);cli_txt_list_flush(&p2p_groups);cli_txt_list_flush(&bsses);cli_txt_list_flush(&ifnames);cli_txt_list_flush(&networks);if (edit_started)edit_deinit(hfile, wpa_cli_edit_filter_history_cb);os_free(hfile);eloop_cancel_timeout(wpa_cli_ping, NULL, NULL);wpa_cli_close_connection();
}

在这个函数里面就是注册try_connection。time到后就可以执行。这里面时间为0，也就是马上执行。
继续对try_connection函数进行分析

static void try_connection(void *eloop_ctx, void *timeout_ctx)
{···if (!wpa_cli_open_connection(ctrl_ifname, 1) == 0) {···}···
···
done:start_edit();
}

这里面就是打开socket用来与wpa_supplicant进行通讯，之后调用start_edit()函数

static void start_edit(void)
{···if (edit_init(wpa_cli_edit_cmd_cb, wpa_cli_edit_eof_cb,wpa_cli_edit_completion_cb, NULL, hfile, ps) < 0) {eloop_terminate();return;}
···
}

这里面注册了三个callback函数：

wpa_cli_edit_cmd_cb。查找用户输入命令对应的函数，找到后执行，就是将用户指令发送个supplicant
wpa_cli_edit_eof_cb，用户交互完毕之后调用。用来结束wpa_cli进程
wpa_cli_edit_completion_cb，用户输入完毕调用函数。

下面主要分析wpa_cli_edit_cmd_cb函数。

static void wpa_cli_edit_cmd_cb(void *ctx, char *cmd)
{char *argv[max_args];int argc;argc = tokenize_cmd(cmd, argv);if (argc)wpa_request(ctrl_conn, argc, argv);
}

这个函数就是获得用户输入的命令，之后调用wpa_request进行处理。

static int wpa_request(struct wpa_ctrl *ctrl, int argc, char *argv[])
{···cmd = wpa_cli_commands;while (cmd->cmd) {if (os_strncasecmp(cmd->cmd, argv[0], os_strlen(argv[0])) == 0){match = cmd;if (os_strcasecmp(cmd->cmd, argv[0]) == 0) {/* we have an exact match */count = 1;break;}count++;}cmd++;}···ret = match->handler(ctrl, argc - 1, &argv[1]);
}

这个函数里面主要就进行了上述的两个工作：
1.查找用户输入命令对应的函数
2.调用对应函数的handler

那么handler是如何定义的呢？
通过源码可以找到这些command都对应一个函数。这些函数都被封装到一个机构题里面。结构体内容如下：

static const struct wpa_cli_cmd wpa_cli_commands[] = {{ "status", wpa_cli_cmd_status, NULL,cli_cmd_flag_none,"[verbose] = get current WPA/EAPOL/EAP status" },{ "ifname", wpa_cli_cmd_ifname, NULL,cli_cmd_flag_none,"= get current interface name" },{ "ping", wpa_cli_cmd_ping, NULL,cli_cmd_flag_none,"= pings wpa_supplicant" },{ "relog", wpa_cli_cmd_relog, NULL,cli_cmd_flag_none,"= re-open log-file (allow rolling logs)" },{ "note", wpa_cli_cmd_note, NULL,cli_cmd_flag_none,"<text> = add a note to wpa_supplicant debug log" },{ "mib", wpa_cli_cmd_mib, NULL,cli_cmd_flag_none,"= get MIB variables (dot1x, dot11)" },{ "help", wpa_cli_cmd_help, wpa_cli_complete_help,cli_cmd_flag_none,"[command] = show usage help" },{ "interface", wpa_cli_cmd_interface, NULL,cli_cmd_flag_none,"[ifname] = show interfaces/select interface" },{ "level", wpa_cli_cmd_level, NULL,cli_cmd_flag_none,"<debug level> = change debug level" },{ "license", wpa_cli_cmd_license, NULL,cli_cmd_flag_none,"= show full wpa_cli license" },{ "quit", wpa_cli_cmd_quit, NULL,cli_cmd_flag_none,"= exit wpa_cli" },{ "set", wpa_cli_cmd_set, wpa_cli_complete_set,cli_cmd_flag_none,"= set variables (shows list of variables when run without ""arguments)" },{ "dump", wpa_cli_cmd_dump, NULL,cli_cmd_flag_none,"= dump config variables" },{ "get", wpa_cli_cmd_get, wpa_cli_complete_get,cli_cmd_flag_none,"<name> = get information" },{ "logon", wpa_cli_cmd_logon, NULL,cli_cmd_flag_none,"= IEEE 802.1X EAPOL state machine logon" },{ "logoff", wpa_cli_cmd_logoff, NULL,cli_cmd_flag_none,"= IEEE 802.1X EAPOL state machine logoff" },{ "pmksa", wpa_cli_cmd_pmksa, NULL,cli_cmd_flag_none,"= show PMKSA cache" },{ "pmksa_flush", wpa_cli_cmd_pmksa_flush, NULL,cli_cmd_flag_none,"= flush PMKSA cache entries" },{ "reassociate", wpa_cli_cmd_reassociate, NULL,cli_cmd_flag_none,"= force reassociation" },{ "reattach", wpa_cli_cmd_reattach, NULL,cli_cmd_flag_none,"= force reassociation back to the same BSS" },{ "preauthenticate", wpa_cli_cmd_preauthenticate, wpa_cli_complete_bss,cli_cmd_flag_none,"<BSSID> = force preauthentication" },{ "identity", wpa_cli_cmd_identity, NULL,cli_cmd_flag_none,"<network id> <identity> = configure identity for an SSID" },{ "password", wpa_cli_cmd_password, NULL,cli_cmd_flag_sensitive,"<network id> <password> = configure password for an SSID" },{ "new_password", wpa_cli_cmd_new_password, NULL,cli_cmd_flag_sensitive,"<network id> <password> = change password for an SSID" },{ "pin", wpa_cli_cmd_pin, NULL,cli_cmd_flag_sensitive,"<network id> <pin> = configure pin for an SSID" },{ "otp", wpa_cli_cmd_otp, NULL,cli_cmd_flag_sensitive,"<network id> <password> = configure one-time-password for an SSID"},{ "passphrase", wpa_cli_cmd_passphrase, NULL,cli_cmd_flag_sensitive,"<network id> <passphrase> = configure private key passphrase\n""  for an SSID" },{ "sim", wpa_cli_cmd_sim, NULL,cli_cmd_flag_sensitive,"<network id> <pin> = report SIM operation result" },{ "bssid", wpa_cli_cmd_bssid, NULL,cli_cmd_flag_none,"<network id> <BSSID> = set preferred BSSID for an SSID" },{ "blacklist", wpa_cli_cmd_blacklist, wpa_cli_complete_bss,cli_cmd_flag_none,"<BSSID> = add a BSSID to the blacklist\n""blacklist clear = clear the blacklist\n""blacklist = display the blacklist" },{ "log_level", wpa_cli_cmd_log_level, NULL,cli_cmd_flag_none,"<level> [<timestamp>] = update the log level/timestamp\n""log_level = display the current log level and log options" },{ "list_networks", wpa_cli_cmd_list_networks, NULL,cli_cmd_flag_none,"= list configured networks" },{ "select_network", wpa_cli_cmd_select_network,wpa_cli_complete_network_id,cli_cmd_flag_none,"<network id> = select a network (disable others)" },{ "enable_network", wpa_cli_cmd_enable_network,wpa_cli_complete_network_id,cli_cmd_flag_none,"<network id> = enable a network" },{ "disable_network", wpa_cli_cmd_disable_network,wpa_cli_complete_network_id,cli_cmd_flag_none,"<network id> = disable a network" },{ "add_network", wpa_cli_cmd_add_network, NULL,cli_cmd_flag_none,"= add a network" },{ "remove_network", wpa_cli_cmd_remove_network,wpa_cli_complete_network_id,cli_cmd_flag_none,"<network id> = remove a network" },{ "set_network", wpa_cli_cmd_set_network, wpa_cli_complete_network,cli_cmd_flag_sensitive,"<network id> <variable> <value> = set network variables (shows\n""  list of variables when run without arguments)" },{ "get_network", wpa_cli_cmd_get_network, wpa_cli_complete_network,cli_cmd_flag_none,"<network id> <variable> = get network variables" },{ "dup_network", wpa_cli_cmd_dup_network, wpa_cli_complete_dup_network,cli_cmd_flag_none,"<src network id> <dst network id> <variable> = duplicate network variables"},{ "list_creds", wpa_cli_cmd_list_creds, NULL,cli_cmd_flag_none,"= list configured credentials" },{ "add_cred", wpa_cli_cmd_add_cred, NULL,cli_cmd_flag_none,"= add a credential" },{ "remove_cred", wpa_cli_cmd_remove_cred, NULL,cli_cmd_flag_none,"<cred id> = remove a credential" },{ "set_cred", wpa_cli_cmd_set_cred, NULL,cli_cmd_flag_sensitive,"<cred id> <variable> <value> = set credential variables" },{ "get_cred", wpa_cli_cmd_get_cred, NULL,cli_cmd_flag_none,"<cred id> <variable> = get credential variables" },{ "save_config", wpa_cli_cmd_save_config, NULL,cli_cmd_flag_none,"= save the current configuration" },{ "disconnect", wpa_cli_cmd_disconnect, NULL,cli_cmd_flag_none,"= disconnect and wait for reassociate/reconnect command before\n""  connecting" },{ "reconnect", wpa_cli_cmd_reconnect, NULL,cli_cmd_flag_none,"= like reassociate, but only takes effect if already disconnected"},{ "scan", wpa_cli_cmd_scan, NULL,cli_cmd_flag_none,"= request new BSS scan" },{ "scan_results", wpa_cli_cmd_scan_results, NULL,cli_cmd_flag_none,"= get latest scan results" },{ "bss", wpa_cli_cmd_bss, wpa_cli_complete_bss,cli_cmd_flag_none,"<<idx> | <bssid>> = get detailed scan result info" },{ "get_capability", wpa_cli_cmd_get_capability, NULL,cli_cmd_flag_none,"<eap/pairwise/group/key_mgmt/proto/auth_alg/channels/freq/modes> ""= get capabilities" },{ "reconfigure", wpa_cli_cmd_reconfigure, NULL,cli_cmd_flag_none,"= force wpa_supplicant to re-read its configuration file" },{ "terminate", wpa_cli_cmd_terminate, NULL,cli_cmd_flag_none,"= terminate wpa_supplicant" },{ "interface_add", wpa_cli_cmd_interface_add, NULL,cli_cmd_flag_none,"<ifname> <confname> <driver> <ctrl_interface> <driver_param>\n""  <bridge_name> = adds new interface, all parameters but <ifname>\n""  are optional" },{ "interface_remove", wpa_cli_cmd_interface_remove, NULL,cli_cmd_flag_none,"<ifname> = removes the interface" },{ "interface_list", wpa_cli_cmd_interface_list, NULL,cli_cmd_flag_none,"= list available interfaces" },{ "ap_scan", wpa_cli_cmd_ap_scan, NULL,cli_cmd_flag_none,"<value> = set ap_scan parameter" },{ "scan_interval", wpa_cli_cmd_scan_interval, NULL,cli_cmd_flag_none,"<value> = set scan_interval parameter (in seconds)" },{ "bss_expire_age", wpa_cli_cmd_bss_expire_age, NULL,cli_cmd_flag_none,"<value> = set BSS expiration age parameter" },{ "bss_expire_count", wpa_cli_cmd_bss_expire_count, NULL,cli_cmd_flag_none,"<value> = set BSS expiration scan count parameter" },{ "bss_flush", wpa_cli_cmd_bss_flush, NULL,cli_cmd_flag_none,"<value> = set BSS flush age (0 by default)" },{ "stkstart", wpa_cli_cmd_stkstart, NULL,cli_cmd_flag_none,"<addr> = request STK negotiation with <addr>" },{ "ft_ds", wpa_cli_cmd_ft_ds, wpa_cli_complete_bss,cli_cmd_flag_none,"<addr> = request over-the-DS FT with <addr>" },{ "wps_pbc", wpa_cli_cmd_wps_pbc, wpa_cli_complete_bss,cli_cmd_flag_none,"[BSSID] = start Wi-Fi Protected Setup: Push Button Configuration" },{ "wps_pin", wpa_cli_cmd_wps_pin, wpa_cli_complete_bss,cli_cmd_flag_sensitive,"<BSSID> [PIN] = start WPS PIN method (returns PIN, if not ""hardcoded)" },{ "wps_check_pin", wpa_cli_cmd_wps_check_pin, NULL,cli_cmd_flag_sensitive,"<PIN> = verify PIN checksum" },{ "wps_cancel", wpa_cli_cmd_wps_cancel, NULL, cli_cmd_flag_none,"Cancels the pending WPS operation" },
#ifdef CONFIG_WPS_NFC{ "wps_nfc", wpa_cli_cmd_wps_nfc, wpa_cli_complete_bss,cli_cmd_flag_none,"[BSSID] = start Wi-Fi Protected Setup: NFC" },{ "wps_nfc_config_token", wpa_cli_cmd_wps_nfc_config_token, NULL,cli_cmd_flag_none,"<WPS|NDEF> = build configuration token" },{ "wps_nfc_token", wpa_cli_cmd_wps_nfc_token, NULL,cli_cmd_flag_none,"<WPS|NDEF> = create password token" },{ "wps_nfc_tag_read", wpa_cli_cmd_wps_nfc_tag_read, NULL,cli_cmd_flag_sensitive,"<hexdump of payload> = report read NFC tag with WPS data" },{ "nfc_get_handover_req", wpa_cli_cmd_nfc_get_handover_req, NULL,cli_cmd_flag_none,"<NDEF> <WPS> = create NFC handover request" },{ "nfc_get_handover_sel", wpa_cli_cmd_nfc_get_handover_sel, NULL,cli_cmd_flag_none,"<NDEF> <WPS> = create NFC handover select" },{ "nfc_report_handover", wpa_cli_cmd_nfc_report_handover, NULL,cli_cmd_flag_none,"<role> <type> <hexdump of req> <hexdump of sel> = report completed ""NFC handover" },
#endif /* CONFIG_WPS_NFC */{ "wps_reg", wpa_cli_cmd_wps_reg, wpa_cli_complete_bss,cli_cmd_flag_sensitive,"<BSSID> <AP PIN> = start WPS Registrar to configure an AP" },{ "wps_ap_pin", wpa_cli_cmd_wps_ap_pin, NULL,cli_cmd_flag_sensitive,"[params..] = enable/disable AP PIN" },{ "wps_er_start", wpa_cli_cmd_wps_er_start, NULL,cli_cmd_flag_none,"[IP address] = start Wi-Fi Protected Setup External Registrar" },{ "wps_er_stop", wpa_cli_cmd_wps_er_stop, NULL,cli_cmd_flag_none,"= stop Wi-Fi Protected Setup External Registrar" },{ "wps_er_pin", wpa_cli_cmd_wps_er_pin, NULL,cli_cmd_flag_sensitive,"<UUID> <PIN> = add an Enrollee PIN to External Registrar" },{ "wps_er_pbc", wpa_cli_cmd_wps_er_pbc, NULL,cli_cmd_flag_none,"<UUID> = accept an Enrollee PBC using External Registrar" },{ "wps_er_learn", wpa_cli_cmd_wps_er_learn, NULL,cli_cmd_flag_sensitive,"<UUID> <PIN> = learn AP configuration" },{ "wps_er_set_config", wpa_cli_cmd_wps_er_set_config, NULL,cli_cmd_flag_none,"<UUID> <network id> = set AP configuration for enrolling" },{ "wps_er_config", wpa_cli_cmd_wps_er_config, NULL,cli_cmd_flag_sensitive,"<UUID> <PIN> <SSID> <auth> <encr> <key> = configure AP" },
#ifdef CONFIG_WPS_NFC{ "wps_er_nfc_config_token", wpa_cli_cmd_wps_er_nfc_config_token, NULL,cli_cmd_flag_none,"<WPS/NDEF> <UUID> = build NFC configuration token" },
#endif /* CONFIG_WPS_NFC */{ "ibss_rsn", wpa_cli_cmd_ibss_rsn, NULL,cli_cmd_flag_none,"<addr> = request RSN authentication with <addr> in IBSS" },
#ifdef CONFIG_AP{ "sta", wpa_cli_cmd_sta, NULL,cli_cmd_flag_none,"<addr> = get information about an associated station (AP)" },{ "all_sta", wpa_cli_cmd_all_sta, NULL,cli_cmd_flag_none,"= get information about all associated stations (AP)" },{ "deauthenticate", wpa_cli_cmd_deauthenticate, NULL,cli_cmd_flag_none,"<addr> = deauthenticate a station" },{ "disassociate", wpa_cli_cmd_disassociate, NULL,cli_cmd_flag_none,"<addr> = disassociate a station" },{ "chan_switch", wpa_cli_cmd_chanswitch, NULL,cli_cmd_flag_none,"<cs_count> <freq> [sec_channel_offset=] [center_freq1=]"" [center_freq2=] [bandwidth=] [blocktx] [ht|vht]"" = CSA parameters" },
#endif /* CONFIG_AP */{ "suspend", wpa_cli_cmd_suspend, NULL, cli_cmd_flag_none,"= notification of suspend/hibernate" },{ "resume", wpa_cli_cmd_resume, NULL, cli_cmd_flag_none,"= notification of resume/thaw" },
#ifdef CONFIG_TESTING_OPTIONS{ "drop_sa", wpa_cli_cmd_drop_sa, NULL, cli_cmd_flag_none,"= drop SA without deauth/disassoc (test command)" },
#endif /* CONFIG_TESTING_OPTIONS */{ "roam", wpa_cli_cmd_roam, wpa_cli_complete_bss,cli_cmd_flag_none,"<addr> = roam to the specified BSS" },
#ifdef CONFIG_MESH{ "mesh_interface_add", wpa_cli_cmd_mesh_interface_add, NULL,cli_cmd_flag_none,"[ifname] = Create a new mesh interface" },{ "mesh_group_add", wpa_cli_cmd_mesh_group_add, NULL,cli_cmd_flag_none,"<network id> = join a mesh network (disable others)" },{ "mesh_group_remove", wpa_cli_cmd_mesh_group_remove, NULL,cli_cmd_flag_none,"<ifname> = Remove mesh group interface" },
#endif /* CONFIG_MESH */
#ifdef CONFIG_P2P{ "p2p_find", wpa_cli_cmd_p2p_find, wpa_cli_complete_p2p_find,cli_cmd_flag_none,"[timeout] [type=*] = find P2P Devices for up-to timeout seconds" },{ "p2p_stop_find", wpa_cli_cmd_p2p_stop_find, NULL, cli_cmd_flag_none,"= stop P2P Devices search" },{ "p2p_asp_provision", wpa_cli_cmd_p2p_asp_provision, NULL,cli_cmd_flag_none,"<addr> adv_id=<adv_id> conncap=<conncap> [info=<infodata>] = provision with a P2P ASP Device" },{ "p2p_asp_provision_resp", wpa_cli_cmd_p2p_asp_provision_resp, NULL,cli_cmd_flag_none,"<addr> adv_id=<adv_id> [role<conncap>] [info=<infodata>] = provision with a P2P ASP Device" },{ "p2p_connect", wpa_cli_cmd_p2p_connect, wpa_cli_complete_p2p_connect,cli_cmd_flag_none,"<addr> <\"pbc\"|PIN> [ht40] = connect to a P2P Device" },{ "p2p_listen", wpa_cli_cmd_p2p_listen, NULL, cli_cmd_flag_none,"[timeout] = listen for P2P Devices for up-to timeout seconds" },{ "p2p_group_remove", wpa_cli_cmd_p2p_group_remove,wpa_cli_complete_p2p_group_remove, cli_cmd_flag_none,"<ifname> = remove P2P group interface (terminate group if GO)" },{ "p2p_group_add", wpa_cli_cmd_p2p_group_add, NULL, cli_cmd_flag_none,"[ht40] = add a new P2P group (local end as GO)" },{ "p2p_prov_disc", wpa_cli_cmd_p2p_prov_disc,wpa_cli_complete_p2p_peer, cli_cmd_flag_none,"<addr> <method> = request provisioning discovery" },{ "p2p_get_passphrase", wpa_cli_cmd_p2p_get_passphrase, NULL,cli_cmd_flag_none,"= get the passphrase for a group (GO only)" },{ "p2p_serv_disc_req", wpa_cli_cmd_p2p_serv_disc_req,wpa_cli_complete_p2p_peer, cli_cmd_flag_none,"<addr> <TLVs> = schedule service discovery request" },{ "p2p_serv_disc_cancel_req", wpa_cli_cmd_p2p_serv_disc_cancel_req,NULL, cli_cmd_flag_none,"<id> = cancel pending service discovery request" },{ "p2p_serv_disc_resp", wpa_cli_cmd_p2p_serv_disc_resp, NULL,cli_cmd_flag_none,"<freq> <addr> <dialog token> <TLVs> = service discovery response" },{ "p2p_service_update", wpa_cli_cmd_p2p_service_update, NULL,cli_cmd_flag_none,"= indicate change in local services" },{ "p2p_serv_disc_external", wpa_cli_cmd_p2p_serv_disc_external, NULL,cli_cmd_flag_none,"<external> = set external processing of service discovery" },{ "p2p_service_flush", wpa_cli_cmd_p2p_service_flush, NULL,cli_cmd_flag_none,"= remove all stored service entries" },{ "p2p_service_add", wpa_cli_cmd_p2p_service_add, NULL,cli_cmd_flag_none,"<bonjour|upnp|asp> <query|version> <response|service> = add a local ""service" },{ "p2p_service_rep", wpa_cli_cmd_p2p_service_rep, NULL,cli_cmd_flag_none,"asp <auto> <adv_id> <svc_state> <svc_string> [<svc_info>] = replace ""local ASP service" },{ "p2p_service_del", wpa_cli_cmd_p2p_service_del, NULL,cli_cmd_flag_none,"<bonjour|upnp> <query|version> [|service] = remove a local ""service" },{ "p2p_reject", wpa_cli_cmd_p2p_reject, wpa_cli_complete_p2p_peer,cli_cmd_flag_none,"<addr> = reject connection attempts from a specific peer" },{ "p2p_invite", wpa_cli_cmd_p2p_invite, NULL,cli_cmd_flag_none,"<cmd> [peer=addr] = invite peer" },{ "p2p_peers", wpa_cli_cmd_p2p_peers, NULL, cli_cmd_flag_none,"[discovered] = list known (optionally, only fully discovered) P2P ""peers" },{ "p2p_peer", wpa_cli_cmd_p2p_peer, wpa_cli_complete_p2p_peer,cli_cmd_flag_none,"<address> = show information about known P2P peer" },{ "p2p_set", wpa_cli_cmd_p2p_set, wpa_cli_complete_p2p_set,cli_cmd_flag_none,"<field> <value> = set a P2P parameter" },{ "p2p_flush", wpa_cli_cmd_p2p_flush, NULL, cli_cmd_flag_none,"= flush P2P state" },{ "p2p_cancel", wpa_cli_cmd_p2p_cancel, NULL, cli_cmd_flag_none,"= cancel P2P group formation" },{ "p2p_unauthorize", wpa_cli_cmd_p2p_unauthorize,wpa_cli_complete_p2p_peer, cli_cmd_flag_none,"<address> = unauthorize a peer" },{ "p2p_presence_req", wpa_cli_cmd_p2p_presence_req, NULL,cli_cmd_flag_none,"[<duration> <interval>] [<duration> <interval>] = request GO ""presence" },{ "p2p_ext_listen", wpa_cli_cmd_p2p_ext_listen, NULL,cli_cmd_flag_none,"[<period> <interval>] = set extended listen timing" },{ "p2p_remove_client", wpa_cli_cmd_p2p_remove_client,wpa_cli_complete_p2p_peer, cli_cmd_flag_none,"<address|iface=address> = remove a peer from all groups" },
#endif /* CONFIG_P2P */
#ifdef CONFIG_WIFI_DISPLAY{ "wfd_subelem_set", wpa_cli_cmd_wfd_subelem_set, NULL,cli_cmd_flag_none,"<subelem> [contents] = set Wi-Fi Display subelement" },{ "wfd_subelem_get", wpa_cli_cmd_wfd_subelem_get, NULL,cli_cmd_flag_none,"<subelem> = get Wi-Fi Display subelement" },
#endif /* CONFIG_WIFI_DISPLAY */
#ifdef CONFIG_INTERWORKING{ "fetch_anqp", wpa_cli_cmd_fetch_anqp, NULL, cli_cmd_flag_none,"= fetch ANQP information for all APs" },{ "stop_fetch_anqp", wpa_cli_cmd_stop_fetch_anqp, NULL,cli_cmd_flag_none,"= stop fetch_anqp operation" },{ "interworking_select", wpa_cli_cmd_interworking_select, NULL,cli_cmd_flag_none,"[auto] = perform Interworking network selection" },{ "interworking_connect", wpa_cli_cmd_interworking_connect,wpa_cli_complete_bss, cli_cmd_flag_none,"<BSSID> = connect using Interworking credentials" },{ "interworking_add_network", wpa_cli_cmd_interworking_add_network,wpa_cli_complete_bss, cli_cmd_flag_none,"<BSSID> = connect using Interworking credentials" },{ "anqp_get", wpa_cli_cmd_anqp_get, wpa_cli_complete_bss,cli_cmd_flag_none,"<addr> <info id>[,<info id>]... = request ANQP information" },{ "gas_request", wpa_cli_cmd_gas_request, wpa_cli_complete_bss,cli_cmd_flag_none,"<addr> <AdvProtoID> [QueryReq] = GAS request" },{ "gas_response_get", wpa_cli_cmd_gas_response_get,wpa_cli_complete_bss, cli_cmd_flag_none,"<addr> <dialog token> [start,len] = Fetch last GAS response" },
#endif /* CONFIG_INTERWORKING */
#ifdef CONFIG_HS20{ "hs20_anqp_get", wpa_cli_cmd_hs20_anqp_get, wpa_cli_complete_bss,cli_cmd_flag_none,"<addr> <subtype>[,<subtype>]... = request HS 2.0 ANQP information"},{ "nai_home_realm_list", wpa_cli_cmd_get_nai_home_realm_list,wpa_cli_complete_bss, cli_cmd_flag_none,"<addr> <home realm> = get HS20 nai home realm list" },{ "hs20_icon_request", wpa_cli_cmd_hs20_icon_request,wpa_cli_complete_bss, cli_cmd_flag_none,"<addr> <icon name> = get Hotspot 2.0 OSU icon" },{ "fetch_osu", wpa_cli_cmd_fetch_osu, NULL, cli_cmd_flag_none,"= fetch OSU provider information from all APs" },{ "cancel_fetch_osu", wpa_cli_cmd_cancel_fetch_osu, NULL,cli_cmd_flag_none,"= cancel fetch_osu command" },
#endif /* CONFIG_HS20 */{ "sta_autoconnect", wpa_cli_cmd_sta_autoconnect, NULL,cli_cmd_flag_none,"<0/1> = disable/enable automatic reconnection" },{ "tdls_discover", wpa_cli_cmd_tdls_discover, NULL,cli_cmd_flag_none,"<addr> = request TDLS discovery with <addr>" },{ "tdls_setup", wpa_cli_cmd_tdls_setup, NULL,cli_cmd_flag_none,"<addr> = request TDLS setup with <addr>" },{ "tdls_teardown", wpa_cli_cmd_tdls_teardown, NULL,cli_cmd_flag_none,"<addr> = tear down TDLS with <addr>" },{ "tdls_link_status", wpa_cli_cmd_tdls_link_status, NULL,cli_cmd_flag_none,"<addr> = TDLS link status with <addr>" },{ "wmm_ac_addts", wpa_cli_cmd_wmm_ac_addts, NULL,cli_cmd_flag_none,"<uplink/downlink/bidi> <tsid=0..7> <up=0..7> [nominal_msdu_size=#] ""[mean_data_rate=#] [min_phy_rate=#] [sba=#] [fixed_nominal_msdu] ""= add WMM-AC traffic stream" },{ "wmm_ac_delts", wpa_cli_cmd_wmm_ac_delts, NULL,cli_cmd_flag_none,"<tsid> = delete WMM-AC traffic stream" },{ "wmm_ac_status", wpa_cli_cmd_wmm_ac_status, NULL,cli_cmd_flag_none,"= show status for Wireless Multi-Media Admission-Control" },{ "tdls_chan_switch", wpa_cli_cmd_tdls_chan_switch, NULL,cli_cmd_flag_none,"<addr> <oper class> <freq> [sec_channel_offset=] [center_freq1=] ""[center_freq2=] [bandwidth=] [ht|vht] = enable channel switching ""with TDLS peer" },{ "tdls_cancel_chan_switch", wpa_cli_cmd_tdls_cancel_chan_switch, NULL,cli_cmd_flag_none,"<addr> = disable channel switching with TDLS peer <addr>" },{ "signal_poll", wpa_cli_cmd_signal_poll, NULL,cli_cmd_flag_none,"= get signal parameters" },{ "pktcnt_poll", wpa_cli_cmd_pktcnt_poll, NULL,cli_cmd_flag_none,"= get TX/RX packet counters" },{ "reauthenticate", wpa_cli_cmd_reauthenticate, NULL,cli_cmd_flag_none,"= trigger IEEE 802.1X/EAPOL reauthentication" },
#ifdef CONFIG_AUTOSCAN{ "autoscan", wpa_cli_cmd_autoscan, NULL, cli_cmd_flag_none,"[params] = Set or unset (if none) autoscan parameters" },
#endif /* CONFIG_AUTOSCAN */
#ifdef CONFIG_WNM{ "wnm_sleep", wpa_cli_cmd_wnm_sleep, NULL, cli_cmd_flag_none,"<enter/exit> [interval=#] = enter/exit WNM-Sleep mode" },{ "wnm_bss_query", wpa_cli_cmd_wnm_bss_query, NULL, cli_cmd_flag_none,"<query reason> = Send BSS Transition Management Query" },
#endif /* CONFIG_WNM */{ "raw", wpa_cli_cmd_raw, NULL, cli_cmd_flag_sensitive,"<params..> = Sent unprocessed command" },{ "flush", wpa_cli_cmd_flush, NULL, cli_cmd_flag_none,"= flush wpa_supplicant state" },
#ifdef ANDROID{ "driver", wpa_cli_cmd_driver, NULL, cli_cmd_flag_none,"<command> = driver private commands" },
#endif /* ANDROID */{ "radio_work", wpa_cli_cmd_radio_work, NULL, cli_cmd_flag_none,"= radio_work <show/add/done>" },{ "vendor", wpa_cli_cmd_vendor, NULL, cli_cmd_flag_none,"<vendor id> <command id> [<hex formatted command argument>] = Send vendor command"},{ "neighbor_rep_request",wpa_cli_cmd_neighbor_rep_request, NULL, cli_cmd_flag_none,"[ssid=<SSID>] = Trigger request to AP for neighboring AP report ""(with optional given SSID, default: current SSID)"},{ "erp_flush", wpa_cli_cmd_erp_flush, NULL, cli_cmd_flag_none,"= flush ERP keys" },{ "mac_rand_scan",wpa_cli_cmd_mac_rand_scan, NULL, cli_cmd_flag_none,"<scan|sched|pno|all> enable=<0/1> [addr=mac-address ""mask=mac-address-mask] = scan MAC randomization"},{ NULL, NULL, NULL, cli_cmd_flag_none, NULL }
};

用户输入命令之后就是从这个列表中查找对应的函数的。
这里面以status命令为例看一下

static int wpa_cli_cmd_status(struct wpa_ctrl *ctrl, int argc, char *argv[])
{if (argc > 0 && os_strcmp(argv[0], "verbose") == 0)return wpa_ctrl_command(ctrl, "STATUS-VERBOSE");if (argc > 0 && os_strcmp(argv[0], "wps") == 0)return wpa_ctrl_command(ctrl, "STATUS-WPS");if (argc > 0 && os_strcmp(argv[0], "driver") == 0)return wpa_ctrl_command(ctrl, "STATUS-DRIVER");return wpa_ctrl_command(ctrl, "STATUS");
}

最终会调用到

int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,char *reply, size_t *reply_len,void (*msg_cb)(char *msg, size_t len))
{DWORD written;DWORD readlen = *reply_len;if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))return -1;if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))return -1;*reply_len = readlen;return 0;
}

就是把命令写入到已经与supplicant连接上的socket里面。

以上就是Wpa_cli的流程分析。
通过上述的分析，能够理解上层应用是如何与supplicant建立起连接的，以及命令是如何发送个supplicant的。

Android 中的wifi.c中也是与wpa_supplicant建立socket，之后将命令发送给wpa_supplicant的。