hostapd_cli: Refresh stations list on control interface reconnect

Whenever reconnecting the control interface the hostapd station list
is unknown as stations might have dropped or connected. Refresh the
list of stations used for command completion on cli connect, reconnect
and interface change.

Signed-off-by: Mikael Kanstrup <mikael.kanstrup@sonymobile.com>

hostapd/hostapd_cli.c

@@ -717,7 +717,7 @@ static int hostapd_cli_cmd_get_config(struct wpa_ctrl *ctrl, int argc,
 
 
 static int wpa_ctrl_command_sta(struct wpa_ctrl *ctrl, char *cmd,
-				char *addr, size_t addr_len)
+				char *addr, size_t addr_len, int print)
 {
 	char buf[4096], *pos;
 	size_t len;
@@ -741,7 +741,8 @@ static int wpa_ctrl_command_sta(struct wpa_ctrl *ctrl, char *cmd,
 	buf[len] = '\0';
 	if (memcmp(buf, "FAIL", 4) == 0)
 		return -1;
-	printf("%s", buf);
+	if (print)
+		printf("%s", buf);
 
 	pos = buf;
 	while (*pos != '\0' && *pos != '\n')
@@ -757,11 +758,11 @@ static int hostapd_cli_cmd_all_sta(struct wpa_ctrl *ctrl, int argc,
 {
 	char addr[32], cmd[64];
 
-	if (wpa_ctrl_command_sta(ctrl, "STA-FIRST", addr, sizeof(addr)))
+	if (wpa_ctrl_command_sta(ctrl, "STA-FIRST", addr, sizeof(addr), 1))
 		return 0;
 	do {
 		snprintf(cmd, sizeof(cmd), "STA-NEXT %s", addr);
-	} while (wpa_ctrl_command_sta(ctrl, cmd, addr, sizeof(addr)) == 0);
+	} while (wpa_ctrl_command_sta(ctrl, cmd, addr, sizeof(addr), 1) == 0);
 
 	return -1;
 }
@@ -903,6 +904,25 @@ static int hostapd_cli_cmd_level(struct wpa_ctrl *ctrl, int argc, char *argv[])
 }
 
 
+static void update_stations(struct wpa_ctrl *ctrl)
+{
+	char addr[32], cmd[64];
+
+	if (!ctrl || !interactive)
+		return;
+
+	cli_txt_list_flush(&stations);
+
+	if (wpa_ctrl_command_sta(ctrl, "STA-FIRST", addr, sizeof(addr), 0))
+		return;
+	do {
+		if (os_strcmp(addr, "") != 0)
+			cli_txt_list_add(&stations, addr);
+		os_snprintf(cmd, sizeof(cmd), "STA-NEXT %s", addr);
+	} while (wpa_ctrl_command_sta(ctrl, cmd, addr, sizeof(addr), 0) == 0);
+}
+
+
 static void hostapd_cli_get_interfaces(struct wpa_ctrl *ctrl,
 				       struct dl_list *interfaces)
 {
@@ -967,6 +987,7 @@ static int hostapd_cli_cmd_interface(struct wpa_ctrl *ctrl, int argc,
 		if (wpa_ctrl_attach(ctrl_conn) == 0) {
 			hostapd_cli_attached = 1;
 			register_event_handler(ctrl_conn);
+			update_stations(ctrl_conn);
 		} else {
 			printf("Warning: Failed to attach to "
 			       "hostapd.\n");
@@ -1526,6 +1547,7 @@ static void hostapd_cli_ping(void *eloop_ctx, void *timeout_ctx)
 			if (wpa_ctrl_attach(ctrl_conn) == 0) {
 				hostapd_cli_attached = 1;
 				register_event_handler(ctrl_conn);
+				update_stations(ctrl_conn);
 			} else {
 				printf("Warning: Failed to attach to "
 				       "hostapd.\n");
@@ -1805,6 +1827,7 @@ int main(int argc, char *argv[])
 		if (wpa_ctrl_attach(ctrl_conn) == 0) {
 			hostapd_cli_attached = 1;
 			register_event_handler(ctrl_conn);
+			update_stations(ctrl_conn);
 		} else {
 			printf("Warning: Failed to attach to hostapd.\n");
 			if (action_file)