config.c

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			wpa_printf(MSG_ERROR, "Line %d: invalid cipher '%s'.",
				   line, start);
			os_free(buf);
			return -1;
		}

		if (last)
			break;
		start = end + 1;
	}
	os_free(buf);

	if (val == 0) {
		wpa_printf(MSG_ERROR, "Line %d: no cipher values configured.",
			   line);
		return -1;
	}
	return val;
}


static char * wpa_config_write_cipher(int cipher)
{
	char *buf, *pos, *end;
	int ret;

	pos = buf = os_zalloc(50);
	if (buf == NULL)
		return NULL;
	end = buf + 50;

	if (cipher & WPA_CIPHER_CCMP) {
		ret = os_snprintf(pos, end - pos, "%sCCMP",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (cipher & WPA_CIPHER_TKIP) {
		ret = os_snprintf(pos, end - pos, "%sTKIP",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (cipher & WPA_CIPHER_WEP104) {
		ret = os_snprintf(pos, end - pos, "%sWEP104",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (cipher & WPA_CIPHER_WEP40) {
		ret = os_snprintf(pos, end - pos, "%sWEP40",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (cipher & WPA_CIPHER_NONE) {
		ret = os_snprintf(pos, end - pos, "%sNONE",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	return buf;
}


static int wpa_config_parse_pairwise(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	int val;
	val = wpa_config_parse_cipher(line, value);
	if (val == -1)
		return -1;
	if (val & ~(WPA_CIPHER_CCMP | WPA_CIPHER_TKIP | WPA_CIPHER_NONE)) {
		wpa_printf(MSG_ERROR, "Line %d: not allowed pairwise cipher "
			   "(0x%x).", line, val);
		return -1;
	}

	wpa_printf(MSG_MSGDUMP, "pairwise: 0x%x", val);
	ssid->pairwise_cipher = val;
	return 0;
}


static char * wpa_config_write_pairwise(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	return wpa_config_write_cipher(ssid->pairwise_cipher);
}


static int wpa_config_parse_group(const struct parse_data *data,
				  struct wpa_ssid *ssid, int line,
				  const char *value)
{
	int val;
	val = wpa_config_parse_cipher(line, value);
	if (val == -1)
		return -1;
	if (val & ~(WPA_CIPHER_CCMP | WPA_CIPHER_TKIP | WPA_CIPHER_WEP104 |
		    WPA_CIPHER_WEP40)) {
		wpa_printf(MSG_ERROR, "Line %d: not allowed group cipher "
			   "(0x%x).", line, val);
		return -1;
	}

	wpa_printf(MSG_MSGDUMP, "group: 0x%x", val);
	ssid->group_cipher = val;
	return 0;
}


static char * wpa_config_write_group(const struct parse_data *data,
				     struct wpa_ssid *ssid)
{
	return wpa_config_write_cipher(ssid->group_cipher);
}


static int wpa_config_parse_auth_alg(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	int val = 0, last, errors = 0;
	char *start, *end, *buf;

	buf = os_strdup(value);
	if (buf == NULL)
		return -1;
	start = buf;

	while (*start != '\0') {
		while (*start == ' ' || *start == '\t')
			start++;
		if (*start == '\0')
			break;
		end = start;
		while (*end != ' ' && *end != '\t' && *end != '\0')
			end++;
		last = *end == '\0';
		*end = '\0';
		if (os_strcmp(start, "OPEN") == 0)
			val |= WPA_AUTH_ALG_OPEN;
		else if (os_strcmp(start, "SHARED") == 0)
			val |= WPA_AUTH_ALG_SHARED;
		else if (os_strcmp(start, "LEAP") == 0)
			val |= WPA_AUTH_ALG_LEAP;
		else {
			wpa_printf(MSG_ERROR, "Line %d: invalid auth_alg '%s'",
				   line, start);
			errors++;
		}

		if (last)
			break;
		start = end + 1;
	}
	os_free(buf);

	if (val == 0) {
		wpa_printf(MSG_ERROR,
			   "Line %d: no auth_alg values configured.", line);
		errors++;
	}

	wpa_printf(MSG_MSGDUMP, "auth_alg: 0x%x", val);
	ssid->auth_alg = val;
	return errors ? -1 : 0;
}


static char * wpa_config_write_auth_alg(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	char *buf, *pos, *end;
	int ret;

	pos = buf = os_zalloc(30);
	if (buf == NULL)
		return NULL;
	end = buf + 30;

	if (ssid->auth_alg & WPA_AUTH_ALG_OPEN) {
		ret = os_snprintf(pos, end - pos, "%sOPEN",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (ssid->auth_alg & WPA_AUTH_ALG_SHARED) {
		ret = os_snprintf(pos, end - pos, "%sSHARED",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	if (ssid->auth_alg & WPA_AUTH_ALG_LEAP) {
		ret = os_snprintf(pos, end - pos, "%sLEAP",
				  pos == buf ? "" : " ");
		if (ret < 0 || ret >= end - pos) {
			end[-1] = '\0';
			return buf;
		}
		pos += ret;
	}

	return buf;
}


#ifdef IEEE8021X_EAPOL
static int wpa_config_parse_eap(const struct parse_data *data,
				struct wpa_ssid *ssid, int line,
				const char *value)
{
	int last, errors = 0;
	char *start, *end, *buf;
	struct eap_method_type *methods = NULL, *tmp;
	size_t num_methods = 0;

	buf = os_strdup(value);
	if (buf == NULL)
		return -1;
	start = buf;

	while (*start != '\0') {
		while (*start == ' ' || *start == '\t')
			start++;
		if (*start == '\0')
			break;
		end = start;
		while (*end != ' ' && *end != '\t' && *end != '\0')
			end++;
		last = *end == '\0';
		*end = '\0';
		tmp = methods;
		methods = os_realloc(methods,
				     (num_methods + 1) * sizeof(*methods));
		if (methods == NULL) {
			os_free(tmp);
			os_free(buf);
			return -1;
		}
		methods[num_methods].method = eap_get_type(
			start, &methods[num_methods].vendor);
		if (methods[num_methods].vendor == EAP_VENDOR_IETF &&
		    methods[num_methods].method == EAP_TYPE_NONE) {
			wpa_printf(MSG_ERROR, "Line %d: unknown EAP method "
				   "'%s'", line, start);
			wpa_printf(MSG_ERROR, "You may need to add support for"
				   " this EAP method during wpa_supplicant\n"
				   "build time configuration.\n"
				   "See README for more information.");
			errors++;
		} else if (methods[num_methods].vendor == EAP_VENDOR_IETF &&
			   methods[num_methods].method == EAP_TYPE_LEAP)
			ssid->leap++;
		else
			ssid->non_leap++;
		num_methods++;
		if (last)
			break;
		start = end + 1;
	}
	os_free(buf);

	tmp = methods;
	methods = os_realloc(methods, (num_methods + 1) * sizeof(*methods));
	if (methods == NULL) {
		os_free(tmp);
		return -1;
	}
	methods[num_methods].vendor = EAP_VENDOR_IETF;
	methods[num_methods].method = EAP_TYPE_NONE;
	num_methods++;

	wpa_hexdump(MSG_MSGDUMP, "eap methods",
		    (u8 *) methods, num_methods * sizeof(*methods));
	ssid->eap_methods = methods;
	return errors ? -1 : 0;
}


static char * wpa_config_write_eap(const struct parse_data *data,
				   struct wpa_ssid *ssid)
{
	int i, ret;
	char *buf, *pos, *end;
	const struct eap_method_type *eap_methods = ssid->eap_methods;
	const char *name;

	if (eap_methods == NULL)
		return NULL;

	pos = buf = os_zalloc(100);
	if (buf == NULL)
		return NULL;
	end = buf + 100;

	for (i = 0; eap_methods[i].vendor != EAP_VENDOR_IETF ||
		     eap_methods[i].method != EAP_TYPE_NONE; i++) {
		name = eap_get_name(eap_methods[i].vendor,
				    eap_methods[i].method);
		if (name) {
			ret = os_snprintf(pos, end - pos, "%s%s",
					  pos == buf ? "" : " ", name);
			if (ret < 0 || ret >= end - pos)
				break;
			pos += ret;
		}
	}

	end[-1] = '\0';

	return buf;
}
#endif /* IEEE8021X_EAPOL */


static int wpa_config_parse_wep_key(u8 *key, size_t *len, int line,
				    const char *value, int idx)
{
	char *buf, title[20];

	buf = wpa_config_parse_string(value, len);
	if (buf == NULL) {
		wpa_printf(MSG_ERROR, "Line %d: Invalid WEP key %d '%s'.",
			   line, idx, value);
		return -1;
	}
	if (*len > MAX_WEP_KEY_LEN) {
		wpa_printf(MSG_ERROR, "Line %d: Too long WEP key %d '%s'.",
			   line, idx, value);
		os_free(buf);
		return -1;
	}
	os_memcpy(key, buf, *len);
	os_free(buf);
	os_snprintf(title, sizeof(title), "wep_key%d", idx);
	wpa_hexdump_key(MSG_MSGDUMP, title, key, *len);
	return 0;
}


static int wpa_config_parse_wep_key0(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	return wpa_config_parse_wep_key(ssid->wep_key[0],
					&ssid->wep_key_len[0], line,
					value, 0);
}


static int wpa_config_parse_wep_key1(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	return wpa_config_parse_wep_key(ssid->wep_key[1],
					&ssid->wep_key_len[1], line,
					value, 1);
}


static int wpa_config_parse_wep_key2(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	return wpa_config_parse_wep_key(ssid->wep_key[2],
					&ssid->wep_key_len[2], line,
					value, 2);
}


static int wpa_config_parse_wep_key3(const struct parse_data *data,
				     struct wpa_ssid *ssid, int line,
				     const char *value)
{
	return wpa_config_parse_wep_key(ssid->wep_key[3],
					&ssid->wep_key_len[3], line,
					value, 3);
}


static char * wpa_config_write_wep_key(struct wpa_ssid *ssid, int idx)
{
	if (ssid->wep_key_len[idx] == 0)
		return NULL;
	return wpa_config_write_string(ssid->wep_key[idx],
				       ssid->wep_key_len[idx]);
}


static char * wpa_config_write_wep_key0(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	return wpa_config_write_wep_key(ssid, 0);
}


static char * wpa_config_write_wep_key1(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	return wpa_config_write_wep_key(ssid, 1);
}


static char * wpa_config_write_wep_key2(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	return wpa_config_write_wep_key(ssid, 2);
}


static char * wpa_config_write_wep_key3(const struct parse_data *data,
					struct wpa_ssid *ssid)
{
	return wpa_config_write_wep_key(ssid, 3);
}


/* Helper macros for network block parser */

#ifdef OFFSET
#undef OFFSET
#endif /* OFFSET */
/* OFFSET: Get offset of a variable within the wpa_ssid structure */
#define OFFSET(v) ((void *) &((struct wpa_ssid *) 0)->v)

/* STR: Define a string variable for an ASCII string; f = field name */
#define _STR(f) #f, wpa_config_parse_str, wpa_config_write_str, OFFSET(f)
#define STR(f) _STR(f), NULL, NULL, NULL, 0
#define STR_KEY(f) _STR(f), NULL, NULL, NULL, 1

/* STR_LEN: Define a string variable with a separate variable for storing the
 * data length. Unlike STR(), this can be used to store arbitrary binary data
 * (i.e., even nul termination character). */
#define _STR_LEN(f) _STR(f), OFFSET(f ## _len)
#define STR_LEN(f) _STR_LEN(f), NULL, NULL, 0
#define STR_LEN_KEY(f) _STR_LEN(f), NULL, NULL, 1

/* STR_RANGE: Like STR_LEN(), but with minimum and maximum allowed length
 * explicitly specified. */
#define _STR_RANGE(f, min, max) _STR_LEN(f), (void *) (min), (void *) (max)
#define STR_RANGE(f, min, max) _STR_RANGE(f, min, max), 0
#define STR_RANGE_KEY(f, min, max) _STR_RANGE(f, min, max), 1

#define _INT(f) #f, wpa_config_parse_int, wpa_config_write_int, \
	OFFSET(f), (void *) 0

/* INT: Define an integer variable */
#define INT(f) _INT(f), NULL, NULL, 0

/* INT_RANGE: Define an integer variable with allowed value range */
#define INT_RANGE(f, min, max) _INT(f), (void *) (min), (void *) (max), 0

/* FUNC: Define a configuration variable that uses a custom function for
 * parsing and writing the value. */
#define _FUNC(f) #f, wpa_config_parse_ ## f, wpa_config_write_ ## f, \
	NULL, NULL, NULL, NULL
#define FUNC(f) _FUNC(f), 0
#define FUNC_KEY(f) _FUNC(f), 1

/*
 * Table of network configuration variables. This table is used to parse each
 * network configuration variable, e.g., each line in wpa_supplicant.conf file
 * that is inside a network block.
 *
 * This table is generated using the helper macros defined above and with
 * generous help from the C pre-processor. The field name is stored as a string
 * into .name and for STR and INT types, the offset of the target buffer within
 * struct wpa_ssid is stored in .param1. .param2 (if not NULL) is similar
 * offset to the field containing the length of the configuration variable.
 * .param3 and .param4 can be used to mark the allowed range (length for STR
 * and value for INT).
 *
 * For each configuration line in wpa_supplicant.conf, the parser goes through
 * this table and select the entry that matches with the field name. The parser
 * function (.parser) is then called to parse the actual value of the field.
 *
 * This kind of mechanism makes it easy to add new configuration parameters,
 * since only one line needs to be added into this table and into the
 * struct wpa_ssid definition if the new variable is either a string or
 * integer. More complex types will need to use their own parser and writer
 * functions.
 */
static const struct parse_data ssid_fields[] = {
	{ STR_RANGE(ssid, 0, MAX_SSID_LEN) },
	{ INT_RANGE(scan_ssid, 0, 1) },
	{ FUNC(bssid) },
	{ FUNC_KEY(psk) },
	{ FUNC(proto) },
	{ FUNC(key_mgmt) },
	{ FUNC(pairwise) },
	{ FUNC(group) },
	{ FUNC(auth_alg) },
#ifdef IEEE8021X_EAPOL
	{ FUNC(eap) },
	{ STR_LEN(identity) },
	{ STR_LEN(anonymous_identity) },
	{ STR_RANGE_KEY(eappsk, EAP_PSK_LEN_MIN, EAP_PSK_LEN_MAX) },
	{ STR_LEN(nai) },
	{ STR_LEN_KEY(password) },
	{ STR(ca_cert) },
	{ STR(ca_path) },
	{ STR(client_cert) },
	{ STR(private_key) },
	{ STR_KEY(private_key_passwd) },
	{ STR(dh_file) },
	{ STR(subject_match) },
	{ STR(altsubject_match) },
	{ STR(ca_cert2) },
	{ STR(ca_path2) },
	{ STR(client_cert2) },
	{ STR(private_key2) },
	{ STR_KEY(private_key2_passwd) },
	{ STR(dh_file2) },
	{ STR(subject_match2) },
	{ STR(altsubject_match2) },
	{ STR(phase1) },
	{ STR(phase2) },
	{ STR(pcsc) },
	{ STR_KEY(pin) },
	{ STR(engine_id) },
	{ STR(key_id) },
	{ INT(engine) },
	{ INT(eapol_flags) },
#endif /* IEEE8021X_EAPOL */
	{ FUNC_KEY(wep_key0) },
	{ FUNC_KEY(wep_key1) },
	{ FUNC_KEY(wep_key2) },
	{ FUNC_KEY(wep_key3) },
	{ INT(wep_tx_keyidx) },
	{ INT(priority) },
#ifdef IEEE8021X_EAPOL
	{ INT(eap_workaround) },
	{ STR(pac_file) },
	{ INT(fragment_size) },
#endif /* IEEE8021X_EAPOL */
	{ INT_RANGE(mode, 0, 1) },
	{ INT_RANGE(proactive_key_caching, 0, 1) },
	{ INT_RANGE(disabled, 0, 1) },
	{ STR(id_str) },
#ifdef CONFIG_IEEE80211W
	{ INT_RANGE(ieee80211w, 0, 2) },
#endif /* CONFIG_IEEE80211W */
	{ INT_RANGE(peerkey, 0, 1) },
	{ INT_RANGE(mixed_cell, 0, 1) },
	{ INT_RANGE(frequency, 0, 10000) }
};

#undef OFFSET
#undef _STR
#undef STR
#undef STR_KEY
#undef _STR_LEN
#undef STR_LEN
#undef STR_LEN_KEY
#undef _STR_RANGE
#undef STR_RANGE