技术标签: 无线网络 hostapd Linux c语言 linux wireless Linux C 源码 linux网络
hostapd提供了控制命令hostapd_cli,使用方法可以查看usage。
源码中的main函数:
int main(int argc, char *argv[])
{
int warning_displayed = 0;
int c;
int daemonize = 0;
if (os_program_init())//不同操作体统平台下执行不同的环境初始化
return -1;
for (;;) { //执行getopt的选择,h则显示usage
c = getopt(argc, argv, "a:BhG:i:p:P:s:v");
if (c < 0)
break;
switch (c) {
case 'a':
action_file = optarg;
break;
case 'B': //后台执行
daemonize = 1;
break;
case 'G':
ping_interval = atoi(optarg);
break;
case 'h':
usage();
return 0;
case 'v':
printf("%s\n", hostapd_cli_version);
return 0;
case 'i': //选择控制的网络接口
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;
}
}
interactive = (argc == optind) && (action_file == NULL);
if (interactive) {
printf("%s\n\n%s\n\n", hostapd_cli_version, cli_license);
}
if (eloop_init())//创建和初始化epoll
return -1;
for (;;) {
if (ctrl_ifname == NULL) {
struct dirent *dent;
DIR *dir = opendir(ctrl_iface_dir);
if (dir) {
while ((dent = readdir(dir))) {
if (os_strcmp(dent->d_name, ".") == 0
||
os_strcmp(dent->d_name, "..") == 0)
continue;
printf("Selected interface '%s'\n",
dent->d_name);
ctrl_ifname = os_strdup(dent->d_name);
break;
}
closedir(dir);
}
}
ctrl_conn = hostapd_cli_open_connection(ctrl_ifname);//连接hostapd进程
if (ctrl_conn) {
if (warning_displayed)
printf("Connection established.\n");
break;
}
if (!interactive) {
perror("Failed to connect to hostapd - "
"wpa_ctrl_open");
return -1;
}
if (!warning_displayed) {
printf("Could not connect to hostapd - re-trying\n");
warning_displayed = 1;
}
os_sleep(1, 0);
continue;
}
if (interactive || action_file) {
if (wpa_ctrl_attach(ctrl_conn) == 0) {
hostapd_cli_attached = 1;
register_event_handler(ctrl_conn);
} else {
printf("Warning: Failed to attach to hostapd.\n");
if (action_file)
return -1;
}
}
if (daemonize && os_daemonize(pid_file) && eloop_sock_requeue())
return -1;
//以下是控制操作的核心
if (interactive)
hostapd_cli_interactive();
else if (action_file)
hostapd_cli_action(ctrl_conn);
else
wpa_request(ctrl_conn, argc - optind, &argv[optind]);
unregister_event_handler(ctrl_conn);
os_free(ctrl_ifname);
eloop_destroy();
hostapd_cli_cleanup();
return 0;
}
如果是交互状态则,执行交换式的命令行操作hostapd_cli_interactive
,执行是文件操作,则执行hostapd_cli_action
函数,其它情况,执行wpa_request
函数。
hostapd_cli_interactive
函数操作如下:
static void hostapd_cli_interactive(void)
{
printf("\nInteractive mode\n\n");
eloop_register_signal_terminate(hostapd_cli_eloop_terminate, NULL);
edit_init(hostapd_cli_edit_cmd_cb, hostapd_cli_edit_eof_cb,
hostapd_cli_edit_completion_cb, NULL, NULL, NULL);
eloop_register_timeout(ping_interval, 0, hostapd_cli_ping, NULL, NULL);
eloop_run();
cli_txt_list_flush(&stations);
edit_deinit(NULL, NULL);
eloop_cancel_timeout(hostapd_cli_ping, NULL, NULL);
}
主要是调用了edit_init
函数,关联了hostapd_cli_edit_cmd_cb
,hostapd_cli_edit_eof_cb
,hostapd_cli_edit_completion_cb
三个操作函数:
edit_init(hostapd_cli_edit_cmd_cb, hostapd_cli_edit_eof_cb,
hostapd_cli_edit_completion_cb, NULL, NULL, NULL);
最后的执行还是调用操作了wpa_request
static void wpa_request(struct wpa_ctrl *ctrl, int argc, char *argv[])
{
const struct hostapd_cli_cmd *cmd, *match = NULL;
int count;
count = 0;
cmd = hostapd_cli_commands;
while (cmd->cmd) {
if (strncasecmp(cmd->cmd, argv[0], strlen(argv[0])) == 0) {
match = cmd;
if (os_strcasecmp(cmd->cmd, argv[0]) == 0) {
/* we have an exact match */
count = 1;
break;
}
count++;
}
cmd++;
}
if (count > 1) {
printf("Ambiguous command '%s'; possible commands:", argv[0]);
cmd = hostapd_cli_commands;
while (cmd->cmd) {
if (strncasecmp(cmd->cmd, argv[0], strlen(argv[0])) ==
0) {
printf(" %s", cmd->cmd);
}
cmd++;
}
printf("\n");
} else if (count == 0) {
printf("Unknown command '%s'\n", argv[0]);
} else {
match->handler(ctrl, argc - 1, &argv[1]);
}
}
其中结构体hostapd_cli_cmd
是对应命令行不同命令的操作项目集合:
struct hostapd_cli_cmd {
const char *cmd;
int (*handler)(struct wpa_ctrl *ctrl, int argc, char *argv[]);
char ** (*completion)(const char *str, int pos);
const char *usage;
}
最后执行的是操作函数handler()
和completion()
以下是最新稳定版hostapd提供的hostapd_cli操作条目和操作函数集合:
static const struct hostapd_cli_cmd hostapd_cli_commands[] = {
{ "ping", hostapd_cli_cmd_ping, NULL,
"= pings hostapd" },
{ "mib", hostapd_cli_cmd_mib, NULL,
"= get MIB variables (dot1x, dot11, radius)" },
{ "relog", hostapd_cli_cmd_relog, NULL, NULL },
{ "status", hostapd_cli_cmd_status, NULL, NULL },
{ "sta", hostapd_cli_cmd_sta, NULL,
"<addr> = get MIB variables for one station" },
{ "all_sta", hostapd_cli_cmd_all_sta, NULL,
"= get MIB variables for all stations" },
{ "new_sta", hostapd_cli_cmd_new_sta, NULL,
"<addr> = add a new station" },
{ "deauthenticate", hostapd_cli_cmd_deauthenticate,
hostapd_complete_deauthenticate,
"<addr> = deauthenticate a station" },
{ "disassociate", hostapd_cli_cmd_disassociate,
hostapd_complete_disassociate,
"<addr> = disassociate a station" },
#ifdef CONFIG_TAXONOMY
{ "signature", hostapd_cli_cmd_signature, NULL,
"<addr> = get taxonomy signature for a station" },
#endif /* CONFIG_TAXONOMY */
#ifdef CONFIG_IEEE80211W
{ "sa_query", hostapd_cli_cmd_sa_query, NULL,
"<addr> = send SA Query to a station" },
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_WPS
{ "wps_pin", hostapd_cli_cmd_wps_pin, NULL,
"<uuid> <pin> [timeout] [addr] = add WPS Enrollee PIN" },
{ "wps_check_pin", hostapd_cli_cmd_wps_check_pin, NULL,
"<PIN> = verify PIN checksum" },
{ "wps_pbc", hostapd_cli_cmd_wps_pbc, NULL,
"= indicate button pushed to initiate PBC" },
{ "wps_cancel", hostapd_cli_cmd_wps_cancel, NULL,
"= cancel the pending WPS operation" },
#ifdef CONFIG_WPS_NFC
{ "wps_nfc_tag_read", hostapd_cli_cmd_wps_nfc_tag_read, NULL,
"<hexdump> = report read NFC tag with WPS data" },
{ "wps_nfc_config_token", hostapd_cli_cmd_wps_nfc_config_token, NULL,
"<WPS/NDEF> = build NFC configuration token" },
{ "wps_nfc_token", hostapd_cli_cmd_wps_nfc_token, NULL,
"<WPS/NDEF/enable/disable> = manager NFC password token" },
{ "nfc_get_handover_sel", hostapd_cli_cmd_nfc_get_handover_sel, NULL,
NULL },
#endif /* CONFIG_WPS_NFC */
{ "wps_ap_pin", hostapd_cli_cmd_wps_ap_pin, NULL,
"<cmd> [params..] = enable/disable AP PIN" },
{ "wps_config", hostapd_cli_cmd_wps_config, NULL,
"<SSID> <auth> <encr> <key> = configure AP" },
{ "wps_get_status", hostapd_cli_cmd_wps_get_status, NULL,
"= show current WPS status" },
#endif /* CONFIG_WPS */
{ "disassoc_imminent", hostapd_cli_cmd_disassoc_imminent, NULL, NULL },
{ "ess_disassoc", hostapd_cli_cmd_ess_disassoc, NULL, NULL },
{ "bss_tm_req", hostapd_cli_cmd_bss_tm_req, NULL, NULL },
{ "get_config", hostapd_cli_cmd_get_config, NULL,
"= show current configuration" },
{ "help", hostapd_cli_cmd_help, hostapd_cli_complete_help,
"= show this usage help" },
{ "interface", hostapd_cli_cmd_interface, hostapd_complete_interface,
"[ifname] = show interfaces/select interface" },
#ifdef CONFIG_FST
{ "fst", hostapd_cli_cmd_fst, NULL, NULL },
#endif /* CONFIG_FST */
{ "raw", hostapd_cli_cmd_raw, NULL, NULL },
{ "level", hostapd_cli_cmd_level, NULL,
"<debug level> = change debug level" },
{ "license", hostapd_cli_cmd_license, NULL,
"= show full hostapd_cli license" },
{ "quit", hostapd_cli_cmd_quit, NULL,
"= exit hostapd_cli" },
{ "set", hostapd_cli_cmd_set, NULL, NULL },
{ "get", hostapd_cli_cmd_get, NULL, NULL },
{ "set_qos_map_set", hostapd_cli_cmd_set_qos_map_set, NULL, NULL },
{ "send_qos_map_conf", hostapd_cli_cmd_send_qos_map_conf, NULL, NULL },
{ "chan_switch", hostapd_cli_cmd_chan_switch, NULL, NULL },
{ "hs20_wnm_notif", hostapd_cli_cmd_hs20_wnm_notif, NULL, NULL },
{ "hs20_deauth_req", hostapd_cli_cmd_hs20_deauth_req, NULL, NULL },
{ "vendor", hostapd_cli_cmd_vendor, NULL, NULL },
{ "enable", hostapd_cli_cmd_enable, NULL, NULL },
{ "reload", hostapd_cli_cmd_reload, NULL, NULL },
{ "disable", hostapd_cli_cmd_disable, NULL, NULL },
{ "erp_flush", hostapd_cli_cmd_erp_flush, NULL, NULL },
{ "log_level", hostapd_cli_cmd_log_level, NULL, NULL },
{ "pmksa", hostapd_cli_cmd_pmksa, NULL, NULL },
{ "pmksa_flush", hostapd_cli_cmd_pmksa_flush, NULL, NULL },
{ "set_neighbor", hostapd_cli_cmd_set_neighbor, NULL, NULL },
{ "remove_neighbor", hostapd_cli_cmd_remove_neighbor, NULL, NULL },
{ "req_lci", hostapd_cli_cmd_req_lci, NULL, NULL },
{ "req_range", hostapd_cli_cmd_req_range, NULL, NULL },
{ "driver_flags", hostapd_cli_cmd_driver_flags, NULL, NULL },
{ NULL, NULL, NULL, NULL }
};
可以通过查找相应的调用执行函数了解hostapt_cli相应操作的详细执行过程。
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