config.c

一个Linux下无线网卡的设置工具

	{ STR(pin), .key_data = 1 },
	{ STR(engine_id) },
	{ STR(key_id) },
	{ INT(engine) },
	{ INT(eapol_flags) },
	{ FUNC(wep_key0), .key_data = 1 },
	{ FUNC(wep_key1), .key_data = 1 },
	{ FUNC(wep_key2), .key_data = 1 },
	{ FUNC(wep_key3), .key_data = 1 },
	{ INT(wep_tx_keyidx) },
	{ INT(priority) },
	{ INT(eap_workaround) },
	{ STR(pac_file) },
	{ INT_RANGE(mode, 0, 1) },
	{ INT_RANGE(proactive_key_caching, 0, 1) },
	{ INT_RANGE(disabled, 0, 1) },
};

#undef OFFSET
#undef STR
#undef STR_LEN
#undef STR_RANGE
#undef INT
#undef INT_RANGE
#undef FUNC
#define NUM_SSID_FIELDS (sizeof(ssid_fields) / sizeof(ssid_fields[0]))


/**
 * wpa_config_add_prio_network - Add a network to priority lists
 * @config: Configuration data from wpa_config_read()
 * @ssid: Pointer to the network configuration to be added to the list
 * Returns: 0 on success, -1 on failure
 *
 * This function is used to add a network block to the priority list of
 * networks. This must be called for each network when reading in the full
 * configuration. In addition, this can be used indirectly when updating
 * priorities by calling wpa_config_update_prio_list().
 */
int wpa_config_add_prio_network(struct wpa_config *config,
				struct wpa_ssid *ssid)
{
	int prio;
	struct wpa_ssid *prev, **nlist;

	/*
	 * Add to an existing priority list if one is available for the
	 * configured priority level for this network.
	 */
	for (prio = 0; prio < config->num_prio; prio++) {
		prev = config->pssid[prio];
		if (prev->priority == ssid->priority) {
			while (prev->pnext)
				prev = prev->pnext;
			prev->pnext = ssid;
			return 0;
		}
	}

	/* First network for this priority - add a new priority list */
	nlist = realloc(config->pssid,
			(config->num_prio + 1) * sizeof(struct wpa_ssid *));
	if (nlist == NULL)
		return -1;

	for (prio = 0; prio < config->num_prio; prio++) {
		if (nlist[prio]->priority < ssid->priority)
			break;
	}

	memmove(&nlist[prio + 1], &nlist[prio],
		(config->num_prio - prio) * sizeof(struct wpa_ssid *));

	nlist[prio] = ssid;
	config->num_prio++;
	config->pssid = nlist;

	return 0;
}


/**
 * wpa_config_update_prio_list - Update network priority list
 * @config: Configuration data from wpa_config_read()
 * Returns: 0 on success, -1 on failure
 *
 * This function is called to update the priority list of networks in the
 * configuration when a network is being added or removed. This is also called
 * if a priority for a network is changed.
 */
static int wpa_config_update_prio_list(struct wpa_config *config)
{
	struct wpa_ssid *ssid;
	int ret = 0;

	free(config->pssid);
	config->pssid = NULL;
	config->num_prio = 0;

	ssid = config->ssid;
	while (ssid) {
		ssid->pnext = NULL;
		if (wpa_config_add_prio_network(config, ssid) < 0)
			ret = -1;
		ssid = ssid->next;
	}

	return ret;
}


/**
 * wpa_config_free_ssid - Free network/ssid configuration data
 * @ssid: Configuration data for the network
 *
 * This function frees all resources allocated for the network configuration
 * data.
 */
void wpa_config_free_ssid(struct wpa_ssid *ssid)
{
	free(ssid->ssid);
	free(ssid->passphrase);
	free(ssid->eap_methods);
	free(ssid->identity);
	free(ssid->anonymous_identity);
	free(ssid->eappsk);
	free(ssid->nai);
	free(ssid->password);
	free(ssid->ca_cert);
	free(ssid->ca_path);
	free(ssid->client_cert);
	free(ssid->private_key);
	free(ssid->private_key_passwd);
	free(ssid->dh_file);
	free(ssid->subject_match);
	free(ssid->altsubject_match);
	free(ssid->ca_cert2);
	free(ssid->ca_path2);
	free(ssid->client_cert2);
	free(ssid->private_key2);
	free(ssid->private_key2_passwd);
	free(ssid->dh_file2);
	free(ssid->subject_match2);
	free(ssid->altsubject_match2);
	free(ssid->phase1);
	free(ssid->phase2);
	free(ssid->pcsc);
	free(ssid->pin);
	free(ssid->engine_id);
	free(ssid->key_id);
	free(ssid->otp);
	free(ssid->pending_req_otp);
	free(ssid->pac_file);
	free(ssid->new_password);
	free(ssid);
}


/**
 * wpa_config_free - Free configuration data
 * @config: Configuration data from wpa_config_read()
 *
 * This function frees all resources allocated for the configuration data by
 * wpa_config_read().
 */
void wpa_config_free(struct wpa_config *config)
{
	struct wpa_config_blob *blob, *prevblob;
	struct wpa_ssid *ssid, *prev = NULL;
	ssid = config->ssid;
	while (ssid) {
		prev = ssid;
		ssid = ssid->next;
		wpa_config_free_ssid(prev);
	}

	blob = config->blobs;
	prevblob = NULL;
	while (blob) {
		prevblob = blob;
		blob = blob->next;
		wpa_config_free_blob(prevblob);
	}

	free(config->ctrl_interface);
	free(config->opensc_engine_path);
	free(config->pkcs11_engine_path);
	free(config->pkcs11_module_path);
	free(config->driver_param);
	free(config->pssid);
	free(config);
}


/**
 * wpa_config_allowed_eap_method - Check whether EAP method is allowed
 * @ssid: Pointer to configuration data
 * @method: EAP type
 * Returns: 1 = allowed EAP method, 0 = not allowed
 */
int wpa_config_allowed_eap_method(struct wpa_ssid *ssid, int method)
{
	u8 *pos;

	if (ssid == NULL || ssid->eap_methods == NULL)
		return 1;

	pos = ssid->eap_methods;
	while (*pos != EAP_TYPE_NONE) {
		if (*pos == method)
			return 1;
		pos++;
	}
	return 0;
}


/**
 * wpa_config_get_network - Get configured network based on id
 * @config: Configuration data from wpa_config_read()
 * @id: Unique network id to search for
 * Returns: Network configuration or %NULL if not found
 */
struct wpa_ssid * wpa_config_get_network(struct wpa_config *config, int id)
{
	struct wpa_ssid *ssid;

	ssid = config->ssid;
	while (ssid) {
		if (id == ssid->id)
			break;
		ssid = ssid->next;
	}

	return ssid;
}


/**
 * wpa_config_add_network - Add a new network with empty configuration
 * @config: Configuration data from wpa_config_read()
 * Returns: The new network configuration or %NULL if operation failed
 */
struct wpa_ssid * wpa_config_add_network(struct wpa_config *config)
{
	int id;
	struct wpa_ssid *ssid, *last = NULL;

	id = -1;
	ssid = config->ssid;
	while (ssid) {
		if (ssid->id > id)
			id = ssid->id;
		last = ssid;
		ssid = ssid->next;
	}
	id++;

	ssid = malloc(sizeof(*ssid));
	if (ssid == NULL)
		return NULL;
	memset(ssid, 0, sizeof(*ssid));
	ssid->id = id;
	if (last)
		last->next = ssid;
	else
		config->ssid = ssid;

	wpa_config_update_prio_list(config);

	return ssid;
}


/**
 * wpa_config_remove_network - Remove a configured network based on id
 * @config: Configuration data from wpa_config_read()
 * @id: Unique network id to search for
 * Returns: 0 on success, or -1 if the network was not found
 */
int wpa_config_remove_network(struct wpa_config *config, int id)
{
	struct wpa_ssid *ssid, *prev = NULL;

	ssid = config->ssid;
	while (ssid) {
		if (id == ssid->id)
			break;
		prev = ssid;
		ssid = ssid->next;
	}

	if (ssid == NULL)
		return -1;

	if (prev)
		prev->next = ssid->next;
	else
		config->ssid = ssid->next;

	wpa_config_update_prio_list(config);
	wpa_config_free_ssid(ssid);
	return 0;
}


/**
 * wpa_config_set_network_defaults - Set network default values
 * @ssid: Pointer to network configuration data
 */
void wpa_config_set_network_defaults(struct wpa_ssid *ssid)
{
	ssid->proto = DEFAULT_PROTO;
	ssid->pairwise_cipher = DEFAULT_PAIRWISE;
	ssid->group_cipher = DEFAULT_GROUP;
	ssid->key_mgmt = DEFAULT_KEY_MGMT;
	ssid->eapol_flags = DEFAULT_EAPOL_FLAGS;
	ssid->eap_workaround = DEFAULT_EAP_WORKAROUND;
}


/**
 * wpa_config_set - Set a variable in network configuration
 * @ssid: Pointer to network configuration data
 * @var: Variable name, e.g., "ssid"
 * @value: Variable value
 * @line: Line number in configuration file or 0 if not used
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to set network configuration variables based on
 * both the configuration file and management interface input. The value
 * parameter must be in the same format as the text-based configuration file is
 * using. For example, strings are using double quotation marks.
 */
int wpa_config_set(struct wpa_ssid *ssid, const char *var, const char *value,
		   int line)
{
	int i, ret = 0;

	if (ssid == NULL || var == NULL || value == NULL)
		return -1;

	for (i = 0; i < NUM_SSID_FIELDS; i++) {
		const struct parse_data *field = &ssid_fields[i];
		if (strcmp(var, field->name) != 0)
			continue;

		if (field->parser(field, ssid, line, value)) {
			if (line) {
				wpa_printf(MSG_ERROR, "Line %d: failed to "
					   "parse %s '%s'.", line, var, value);
			}
			ret = -1;
		}
		break;
	}
	if (i == NUM_SSID_FIELDS) {
		if (line) {
			wpa_printf(MSG_ERROR, "Line %d: unknown network field "
				   "'%s'.", line, var);
		}
		ret = -1;
	}

	return ret;
}


/**
 * wpa_config_get - Get a variable in network configuration
 * @ssid: Pointer to network configuration data
 * @var: Variable name, e.g., "ssid"
 * Returns: Value of the variable or %NULL on failure
 *
 * This function can be used to get network configuration variables. The
 * returned value is a copy of the configuration variable in text format, i.e,.
 * the same format that the text-based configuration file and wpa_config_set()
 * are using for the value. The caller is responsible for freeing the returned
 * value.
 */
char * wpa_config_get(struct wpa_ssid *ssid, const char *var)
{
	int i;

	if (ssid == NULL || var == NULL)
		return NULL;

	for (i = 0; i < NUM_SSID_FIELDS; i++) {
		const struct parse_data *field = &ssid_fields[i];
		if (strcmp(var, field->name) == 0)
			return field->writer(field, ssid);
	}

	return NULL;
}


/**
 * wpa_config_update_psk - Update WPA PSK based on passphrase and SSID
 * @ssid: Pointer to network configuration data
 *
 * This function must be called to update WPA PSK when either SSID or the
 * passphrase has changed for the network configuration.
 */
void wpa_config_update_psk(struct wpa_ssid *ssid)
{
	pbkdf2_sha1(ssid->passphrase,
		    (char *) ssid->ssid, ssid->ssid_len, 4096,
		    ssid->psk, PMK_LEN);
	wpa_hexdump_key(MSG_MSGDUMP, "PSK (from passphrase)",
			ssid->psk, PMK_LEN);
	ssid->psk_set = 1;
}


/**
 * wpa_config_get_blob - Get a named configuration blob
 * @config: Configuration data from wpa_config_read()
 * @name: Name of the blob
 * Returns: Pointer to blob data or %NULL if not found
 */
const struct wpa_config_blob * wpa_config_get_blob(struct wpa_config *config,
						   const char *name)
{
	struct wpa_config_blob *blob = config->blobs;

	while (blob) {
		if (strcmp(blob->name, name) == 0)
			return blob;
		blob = blob->next;
	}
	return NULL;
}


/**
 * wpa_config_set_blob - Set or add a named configuration blob
 * @config: Configuration data from wpa_config_read()
 * @blob: New value for the blob
 *
 * Adds a new configuration blob or replaces the current value of an existing
 * blob.
 */
void wpa_config_set_blob(struct wpa_config *config,
			 struct wpa_config_blob *blob)
{
	wpa_config_remove_blob(config, blob->name);
	blob->next = config->blobs;
	config->blobs = blob;
}


/**
 * wpa_config_free_blob - Free blob data
 * @blob: Pointer to blob to be freed
 */
void wpa_config_free_blob(struct wpa_config_blob *blob)
{
	if (blob) {
		free(blob->name);
		free(blob->data);
		free(blob);
	}
}


/**
 * wpa_config_remove_blob - Remove a named configuration blob
 * @config: Configuration data from wpa_config_read()
 * @name: Name of the blob to remove
 * Returns: 0 if blob was removed or -1 if blob was not found
 */
int wpa_config_remove_blob(struct wpa_config *config, const char *name)
{
	struct wpa_config_blob *pos = config->blobs, *prev = NULL;

	while (pos) {
		if (strcmp(pos->name, name) == 0) {
			if (prev)
				prev->next = pos->next;
			else
				config->blobs = pos->next;
			wpa_config_free_blob(pos);
			return 0;
		}
		prev = pos;
		pos = pos->next;
	}

	return -1;
}


/**
 * wpa_config_alloc_empty - Allocate an empty configuration
 * @ctrl_interface: Control interface parameters, e.g., path to UNIX domain
 * socket
 * @driver_param: Driver parameters
 * Returns: Pointer to allocated configuration data or %NULL on failure
 */
struct wpa_config * wpa_config_alloc_empty(const char *ctrl_interface,
					   const char *driver_param)
{
	struct wpa_config *config;

	config = malloc(sizeof(*config));
	if (config == NULL)
		return NULL;
	memset(config, 0, sizeof(*config));
	config->eapol_version = DEFAULT_EAPOL_VERSION;
	config->ap_scan = DEFAULT_AP_SCAN;
	config->fast_reauth = DEFAULT_FAST_REAUTH;

	if (ctrl_interface)
		config->ctrl_interface = strdup(ctrl_interface);
	if (driver_param)
		config->driver_param = strdup(driver_param);

	return config;
}