WPS ER: Add preliminary PBC support

This will need some additional code in wps_er_pbc() to handle PBC mode
enabling for a single AP only. For now, this can only be expected to work
when the ER is connected to a single AP.

src/wps/wps.h

@@ -676,5 +676,6 @@ struct wps_er * wps_er_init(struct wps_context *wps, const char *ifname);
 void wps_er_deinit(struct wps_er *er);
 void wps_er_set_sel_reg(struct wps_er *er, int sel_reg, u16 dev_passwd_id,
 			u16 sel_reg_config_methods);
+int wps_er_pbc(struct wps_er *er, const u8 *uuid);
 
 #endif /* WPS_H */

src/wps/wps_er.c

@@ -1319,3 +1319,21 @@ void wps_er_set_sel_reg(struct wps_er *er, int sel_reg, u16 dev_passwd_id,
 
 	wpabuf_free(msg);
 }
+
+
+int wps_er_pbc(struct wps_er *er, const u8 *uuid)
+{
+	if (er == NULL || er->wps == NULL)
+		return -1;
+
+	/*
+	 * TODO: Should enable PBC mode only in a single AP based on which AP
+	 * the Enrollee (uuid) is using. Now, we may end up enabling multiple
+	 * APs in PBC mode which could result in session overlap at the
+	 * Enrollee.
+	 */
+	if (wps_registrar_button_pushed(er->wps->registrar))
+		return -1;
+
+	return 0;
+}

wpa_supplicant/ctrl_iface.c

@@ -1657,6 +1657,9 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "WPS_ER_PIN ", 11) == 0) {
 		if (wpa_supplicant_ctrl_iface_wps_er_pin(wpa_s, buf + 11))
 			reply_len = -1;
+	} else if (os_strncmp(buf, "WPS_ER_PBC ", 11) == 0) {
+		if (wpas_wps_er_pbc(wpa_s, buf + 11))
+			reply_len = -1;
 #endif /* CONFIG_WPS_ER */
 #endif /* CONFIG_WPS */
 #ifdef CONFIG_IBSS_RSN

wpa_supplicant/wpa_cli.c

@@ -572,6 +572,28 @@ static int wpa_cli_cmd_wps_er_pin(struct wpa_ctrl *ctrl, int argc,
 }
 
 
+static int wpa_cli_cmd_wps_er_pbc(struct wpa_ctrl *ctrl, int argc,
+				  char *argv[])
+{
+	char cmd[256];
+	int res;
+
+	if (argc != 1) {
+		printf("Invalid WPS_ER_PBC command: need one argument:\n"
+		       "- UUID: Specify the Enrollee\n");
+		return -1;
+	}
+
+	res = os_snprintf(cmd, sizeof(cmd), "WPS_ER_PBC %s",
+			  argv[0]);
+	if (res < 0 || (size_t) res >= sizeof(cmd) - 1) {
+		printf("Too long WPS_ER_PBC command.\n");
+		return -1;
+	}
+	return wpa_ctrl_command(ctrl, cmd);
+}
+
+
 static int wpa_cli_cmd_ibss_rsn(struct wpa_ctrl *ctrl, int argc, char *argv[])
 {
 	char cmd[256];
@@ -1445,6 +1467,9 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 	{ "wps_er_pin", wpa_cli_cmd_wps_er_pin,
 	  cli_cmd_flag_sensitive,
 	  "<UUID> <PIN> = add an Enrollee PIN to External Registrar" },
+	{ "wps_er_pbc", wpa_cli_cmd_wps_er_pbc,
+	  cli_cmd_flag_none,
+	  "<UUID> = accept an Enrollee PBC using External Registrar" },
 	{ "ibss_rsn", wpa_cli_cmd_ibss_rsn,
 	  cli_cmd_flag_none,
 	  "<addr> = request RSN authentication with <addr> in IBSS" },

wpa_supplicant/wps_supplicant.c

@@ -1161,4 +1161,14 @@ int wpas_wps_er_add_pin(struct wpa_supplicant *wpa_s, const char *uuid,
 	return wps_registrar_add_pin(wpa_s->wps->registrar, any ? NULL : u,
 				     (const u8 *) pin, os_strlen(pin), 300);
 }
+
+
+int wpas_wps_er_pbc(struct wpa_supplicant *wpa_s, const char *uuid)
+{
+	u8 u[UUID_LEN];
+
+	if (uuid_str2bin(uuid, u))
+		return -1;
+	return wps_er_pbc(wpa_s->wps_er, u);
+}
 #endif /* CONFIG_WPS_ER */

wpa_supplicant/wps_supplicant.h

@@ -53,6 +53,7 @@ int wpas_wps_er_start(struct wpa_supplicant *wpa_s);
 int wpas_wps_er_stop(struct wpa_supplicant *wpa_s);
 int wpas_wps_er_add_pin(struct wpa_supplicant *wpa_s, const char *uuid,
 			const char *pin);
+int wpas_wps_er_pbc(struct wpa_supplicant *wpa_s, const char *uuid);
 
 #else /* CONFIG_WPS */