wpa_supplicant.c

一个Linux下无线网卡的设置工具

			break;
		}
		wpa_s->l2 = l2_packet_init(wpa_s->ifname,
					   wpa_drv_get_mac_addr(wpa_s),
					   ETH_P_EAPOL,
					   wpa_supplicant_rx_eapol, wpa_s, 0);
		if (wpa_s->l2)
			break;
		else if (!wait_for_interface)
			return -1;
		printf("Waiting for interface..\n");
		sleep(5);
	}

	if (wpa_s->l2 && l2_packet_get_own_addr(wpa_s->l2, wpa_s->own_addr)) {
		fprintf(stderr, "Failed to get own L2 address\n");
		return -1;
	}

	wpa_printf(MSG_DEBUG, "Own MAC address: " MACSTR,
		   MAC2STR(wpa_s->own_addr));

	/* Backwards compatibility call to set_wpa() handler. This is called
	 * only just after init and just before deinit, so these handler can be
	 * used to implement same functionality. */
	if (wpa_drv_set_wpa(wpa_s, 1) < 0) {
		struct wpa_driver_capa capa;
		if (wpa_drv_get_capa(wpa_s, &capa) < 0 ||
		    !(capa.flags & (WPA_DRIVER_CAPA_KEY_MGMT_WPA |
				    WPA_DRIVER_CAPA_KEY_MGMT_WPA2))) {
			wpa_printf(MSG_DEBUG, "Driver does not support WPA.");
			/* Continue to allow non-WPA modes to be used. */
		} else {
			fprintf(stderr, "Failed to enable WPA in the "
				"driver.\n");
			return -1;
		}
	}

	wpa_clear_keys(wpa_s, NULL);

	/* Make sure that TKIP countermeasures are not left enabled (could
	 * happen if wpa_supplicant is killed during countermeasures. */
	wpa_drv_set_countermeasures(wpa_s, 0);

	wpa_drv_set_drop_unencrypted(wpa_s, 1);

	wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
	wpa_supplicant_req_scan(wpa_s, interface_count, 100000);
	interface_count++;

	return 0;
}


static int wpa_supplicant_daemon(const char *pid_file)
{
	wpa_printf(MSG_DEBUG, "Daemonize..");
	if (daemon(0, 0)) {
		perror("daemon");
		return -1;
	}

	if (pid_file) {
		FILE *f = fopen(pid_file, "w");
		if (f) {
			fprintf(f, "%u\n", getpid());
			fclose(f);
		}
	}

	return 0;
}


static struct wpa_supplicant * wpa_supplicant_alloc(void)
{
	struct wpa_supplicant *wpa_s;

	wpa_s = malloc(sizeof(*wpa_s));
	if (wpa_s == NULL)
		return NULL;
	memset(wpa_s, 0, sizeof(*wpa_s));
	wpa_s->ctrl_sock = -1;
	wpa_s->scan_req = 1;

	return wpa_s;
}


static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
				     struct wpa_interface *iface)
{
	wpa_printf(MSG_DEBUG, "Initializing interface '%s' conf '%s' driver "
		   "'%s' ctrl_interface '%s'", iface->ifname,
		   iface->confname ? iface->confname : "N/A",
		   iface->driver ? iface->driver : "default",
		   iface->ctrl_interface ? iface->ctrl_interface : "N/A");

	if (wpa_supplicant_set_driver(wpa_s, iface->driver) < 0) {
		return -1;
	}

	if (iface->confname) {
#ifdef CONFIG_BACKEND_FILE
		wpa_s->confname = rel2abs_path(iface->confname);
		if (wpa_s->confname == NULL) {
			wpa_printf(MSG_ERROR, "Failed to get absolute path "
				   "for configuration file '%s'.",
				   iface->confname);
			return -1;
		}
		wpa_printf(MSG_DEBUG, "Configuration file '%s' -> '%s'",
			   iface->confname, wpa_s->confname);
#else /* CONFIG_BACKEND_FILE */
		wpa_s->confname = strdup(iface->confname);
#endif /* CONFIG_BACKEND_FILE */
		wpa_s->conf = wpa_config_read(wpa_s->confname);
		if (wpa_s->conf == NULL) {
			printf("Failed to read read or parse configuration "
			       "'%s'.\n", wpa_s->confname);
			return -1;
		}

		/*
		 * Override ctrl_interface and driver_param if set on command
		 * line.
		 */
		if (iface->ctrl_interface) {
			free(wpa_s->conf->ctrl_interface);
			wpa_s->conf->ctrl_interface =
				strdup(iface->ctrl_interface);
		}

		if (iface->driver_param) {
			free(wpa_s->conf->driver_param);
			wpa_s->conf->driver_param =
				strdup(iface->driver_param);
		}
	} else
		wpa_s->conf = wpa_config_alloc_empty(iface->ctrl_interface,
						     iface->driver_param);

	if (wpa_s->conf == NULL) {
		printf("\nNo configuration found.\n");
		return -1;
	}

	if (iface->ifname == NULL) {
		printf("\nInterface name is required.\n");
		return -1;
	}
	if (strlen(iface->ifname) >= sizeof(wpa_s->ifname)) {
		printf("Too long interface name '%s'.\n", iface->ifname);
		return -1;
	}
	strncpy(wpa_s->ifname, iface->ifname, sizeof(wpa_s->ifname));

	return 0;
}


static int wpa_supplicant_init_eapol(struct wpa_supplicant *wpa_s)
{
#ifdef IEEE8021X_EAPOL
	struct eapol_ctx *ctx;
	ctx = malloc(sizeof(*ctx));
	if (ctx == NULL) {
		printf("Failed to allocate EAPOL context.\n");
		return -1;
	}

	memset(ctx, 0, sizeof(*ctx));
	ctx->ctx = wpa_s;
	ctx->msg_ctx = wpa_s;
	ctx->eapol_send_ctx = wpa_s;
	ctx->preauth = 0;
	ctx->eapol_done_cb = wpa_supplicant_notify_eapol_done;
	ctx->eapol_send = wpa_supplicant_eapol_send;
	ctx->set_wep_key = wpa_eapol_set_wep_key;
	ctx->set_config_blob = wpa_supplicant_set_config_blob;
	ctx->get_config_blob = wpa_supplicant_get_config_blob;
	ctx->aborted_cached = wpa_supplicant_aborted_cached;
	ctx->opensc_engine_path = wpa_s->conf->opensc_engine_path;
	ctx->pkcs11_engine_path = wpa_s->conf->pkcs11_engine_path;
	ctx->pkcs11_module_path = wpa_s->conf->pkcs11_module_path;
	wpa_s->eapol = eapol_sm_init(ctx);
	if (wpa_s->eapol == NULL) {
		free(ctx);
		printf("Failed to initialize EAPOL state machines.\n");
		return -1;
	}
#endif /* IEEE8021X_EAPOL */

	return 0;
}


static int wpa_supplicant_init_wpa(struct wpa_supplicant *wpa_s)
{
#ifndef CONFIG_NO_WPA
	struct wpa_sm_ctx *ctx;
	ctx = malloc(sizeof(*ctx));
	if (ctx == NULL) {
		printf("Failed to allocate WPA context.\n");
		return -1;
	}

	memset(ctx, 0, sizeof(*ctx));
	ctx->ctx = wpa_s;
	ctx->set_state = _wpa_supplicant_set_state;
	ctx->get_state = _wpa_supplicant_get_state;
	ctx->req_scan = _wpa_supplicant_req_scan;
	ctx->deauthenticate = _wpa_supplicant_deauthenticate;
	ctx->disassociate = _wpa_supplicant_disassociate;
	ctx->set_key = wpa_supplicant_set_key;
	ctx->scan = wpa_supplicant_scan;
	ctx->get_ssid = _wpa_supplicant_get_ssid;
	ctx->get_bssid = wpa_supplicant_get_bssid;
	ctx->ether_send = _wpa_ether_send;
	ctx->get_beacon_ie = wpa_supplicant_get_beacon_ie;
	ctx->alloc_eapol = _wpa_alloc_eapol;
	ctx->cancel_auth_timeout = _wpa_supplicant_cancel_auth_timeout;
	ctx->add_pmkid = wpa_supplicant_add_pmkid;
	ctx->remove_pmkid = wpa_supplicant_remove_pmkid;
	ctx->set_config_blob = wpa_supplicant_set_config_blob;
	ctx->get_config_blob = wpa_supplicant_get_config_blob;

	wpa_s->wpa = wpa_sm_init(ctx);
	if (wpa_s->wpa == NULL) {
		fprintf(stderr, "Failed to initialize WPA state machine\n");
		return -1;
	}
#endif /* CONFIG_NO_WPA */

	return 0;
}


static int wpa_supplicant_init_iface2(struct wpa_supplicant *wpa_s,
				      int wait_for_interface)
{
	const char *ifname;

	wpa_printf(MSG_DEBUG, "Initializing interface (2) '%s'",
		   wpa_s->ifname);

	if (wpa_supplicant_init_eapol(wpa_s) < 0)
		return -1;

	/* RSNA Supplicant Key Management - INITIALIZE */
	eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
	eapol_sm_notify_portValid(wpa_s->eapol, FALSE);

	/* Initialize driver interface and register driver event handler before
	 * L2 receive handler so that association events are processed before
	 * EAPOL-Key packets if both become available for the same select()
	 * call. */
	wpa_s->drv_priv = wpa_drv_init(wpa_s, wpa_s->ifname);
	if (wpa_s->drv_priv == NULL) {
		fprintf(stderr, "Failed to initialize driver interface\n");
		return -1;
	}
	if (wpa_drv_set_param(wpa_s, wpa_s->conf->driver_param) < 0) {
		fprintf(stderr, "Driver interface rejected driver_param "
			"'%s'\n", wpa_s->conf->driver_param);
		return -1;
	}

	ifname = wpa_drv_get_ifname(wpa_s);
	if (ifname && strcmp(ifname, wpa_s->ifname) != 0) {
		wpa_printf(MSG_DEBUG, "Driver interface replaced interface "
			   "name with '%s'", ifname);
		strncpy(wpa_s->ifname, ifname, sizeof(wpa_s->ifname));
	}

	if (wpa_supplicant_init_wpa(wpa_s) < 0)
		return -1;

	wpa_sm_set_ifname(wpa_s->wpa, wpa_s->ifname);
	wpa_sm_set_fast_reauth(wpa_s->wpa, wpa_s->conf->fast_reauth);
	wpa_sm_set_eapol(wpa_s->wpa, wpa_s->eapol);

	if (wpa_s->conf->dot11RSNAConfigPMKLifetime &&
	    wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_LIFETIME,
			     wpa_s->conf->dot11RSNAConfigPMKLifetime)) {
		fprintf(stderr, "Invalid WPA parameter value for "
			"dot11RSNAConfigPMKLifetime\n");
		return -1;
	}

	if (wpa_s->conf->dot11RSNAConfigPMKReauthThreshold &&
	    wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_REAUTH_THRESHOLD,
			     wpa_s->conf->dot11RSNAConfigPMKReauthThreshold)) {
		fprintf(stderr, "Invalid WPA parameter value for "
			"dot11RSNAConfigPMKReauthThreshold\n");
		return -1;
	}

	if (wpa_s->conf->dot11RSNAConfigSATimeout &&
	    wpa_sm_set_param(wpa_s->wpa, RSNA_SA_TIMEOUT,
			     wpa_s->conf->dot11RSNAConfigSATimeout)) {
		fprintf(stderr, "Invalid WPA parameter value for "
			"dot11RSNAConfigSATimeout\n");
		return -1;
	}

	if (wpa_supplicant_driver_init(wpa_s, wait_for_interface) < 0) {
		return -1;
	}
	wpa_sm_set_own_addr(wpa_s->wpa, wpa_s->own_addr);

	if (wpa_supplicant_ctrl_iface_init(wpa_s)) {
		printf("Failed to initialize control interface '%s'.\n"
		       "You may have another wpa_supplicant process already "
		       "running or the file was\n"
		       "left by an unclean termination of wpa_supplicant in "
		       "which case you will need\n"
		       "to manually remove this file before starting "
		       "wpa_supplicant again.\n",
		       wpa_s->conf->ctrl_interface);
		return -1;
	}

	return 0;
}


static void wpa_supplicant_deinit_iface(struct wpa_supplicant *wpa_s)
{
	if (wpa_s->drv_priv) {
		wpa_supplicant_deauthenticate(wpa_s, REASON_DEAUTH_LEAVING);

		/* Backwards compatibility call to set_wpa() handler. This is
		 * called only just after init and just before deinit, so these
		 * handler can be used to implement same functionality. */
		if (wpa_drv_set_wpa(wpa_s, 0) < 0) {
			fprintf(stderr, "Failed to disable WPA in the "
				"driver.\n");
		}

		wpa_drv_set_drop_unencrypted(wpa_s, 0);
		wpa_drv_set_countermeasures(wpa_s, 0);
		wpa_clear_keys(wpa_s, NULL);

		wpa_drv_deinit(wpa_s);
	}
	wpa_supplicant_cleanup(wpa_s);
}


/**
 * wpa_supplicant_add_iface - Add a new network interface
 * @global: Pointer to global data from wpa_supplicant_init()
 * @iface: Interface configuration options
 * Returns: Pointer to the created interface or %NULL on failure
 *
 * This function is used to add new network interfaces for %wpa_supplicant.
 * This can be called before wpa_supplicant_run() to add interfaces before the
 * main event loop has been started. In addition, new interfaces can be added
 * dynamically while %wpa_supplicant is already running. This could happen,
 * e.g., when a hotplug network adapter is inserted.
 */
struct wpa_supplicant * wpa_supplicant_add_iface(struct wpa_global *global,
						 struct wpa_interface *iface)
{
	struct wpa_supplicant *wpa_s;

	if (global == NULL || iface == NULL)
		return NULL;

	wpa_s = wpa_supplicant_alloc();
	if (wpa_s == NULL)
		return NULL;

	if (wpa_supplicant_init_iface(wpa_s, iface) ||
	    wpa_supplicant_init_iface2(wpa_s,
				       global->params.wait_for_interface)) {
		wpa_printf(MSG_DEBUG, "Failed to add interface %s",
			   iface->ifname);
		wpa_supplicant_deinit_iface(wpa_s);
		free(wpa_s);
		return NULL;
	}

	wpa_s->global = global;
	wpa_s->next = global->ifaces;
	global->ifaces = wpa_s;

	wpa_printf(MSG_DEBUG, "Added interface %s", wpa_s->ifname);

	return wpa_s;
}


/**
 * wpa_supplicant_remove_iface - Remove a network interface
 * @global: Pointer to global data from wpa_supplicant_init()
 * @wpa_s: Pointer to the network interface to be removed
 * Returns: 0 if interface was removed, -1 if interface was not found
 *
 * This function can be used to dynamically remove network interfaces from
 * %wpa_supplicant, e.g., when a hotplug network adapter is ejected. In
 * addition, this function is used to remove all remaining interdaces when
 * %wpa_supplicant is terminated.
 */
int wpa_supplicant_remove_iface(struct wpa_global *global,
				struct wpa_supplicant *wpa_s)
{
	struct wpa_supplicant *prev;

	/* Remove interface from the global list of interfaces */
	prev = global->ifaces;
	if (prev == wpa_s) {
		global->ifaces = wpa_s->next;
	} else {
		while (prev && prev->next != wpa_s)
			prev = prev->next;
		if (prev == NULL)
			return -1;
		prev->next = wpa_s->next;
	}

	wpa_printf(MSG_DEBUG, "Removing interface %s", wpa_s->ifname);

	wpa_supplicant_deinit_iface(wpa_s);
	free(wpa_s);

	return 0;
}


/**
 * wpa_supplicant_get_iface - Get a new network interface
 * @global: Pointer to global data from wpa_supplicant_init()
 * @ifname: Interface name
 * Returns: Pointer to the interface or %NULL if not found
 */
struct wpa_supplicant * wpa_supplicant_get_iface(struct wpa_global *global,
						 const char *ifname)
{
	struct wpa_supplicant *wpa_s;

	for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
		if (strcmp(wpa_s->ifname, ifname) == 0)
			return wpa_s;
	}
	return NULL;
}


/**
 * wpa_supplicant_init - Initialize %wpa_supplicant
 * @params: Parameters for %wpa_supplicant
 * Re