hostapd: Add alternative format for configuring SSID

The new ssid2 parameter can be used as an alternative mechanism for
configuring SSID for hostapd. It uses the same formats that
wpa_supplicant uses in the configuration file for strings.

Signed-hostap: Jouni Malinen <j@w1.fi>

hostapd/config_file.c

@@ -1472,6 +1472,20 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 					  bss->ssid.ssid_len);
 				bss->ssid.ssid_set = 1;
 			}
+		} else if (os_strcmp(buf, "ssid2") == 0) {
+			size_t slen;
+			char *str = wpa_config_parse_string(pos, &slen);
+			if (str == NULL || slen < 1 ||
+				   slen > HOSTAPD_MAX_SSID_LEN) {
+				wpa_printf(MSG_ERROR, "Line %d: invalid SSID "
+					   "'%s'", line, pos);
+				errors++;
+			} else {
+				os_memcpy(bss->ssid.ssid, str, slen);
+				bss->ssid.ssid_len = slen;
+				bss->ssid.ssid_set = 1;
+			}
+			os_free(str);
 		} else if (os_strcmp(buf, "macaddr_acl") == 0) {
 			bss->macaddr_acl = atoi(pos);
 			if (bss->macaddr_acl != ACCEPT_UNLESS_DENIED &&

hostapd/hostapd.conf

@@ -84,6 +84,11 @@ ctrl_interface_group=0
 
 # SSID to be used in IEEE 802.11 management frames
 ssid=test
+# Alternative formats for configuring SSID
+# (double quoted string, hexdump, printf-escaped string)
+#ssid2="test"
+#ssid2=74657374
+#ssid2=P"hello\nthere"
 
 # Country code (ISO/IEC 3166-1). Used to set regulatory domain.
 # Set as needed to indicate country in which device is operating.

src/ap/wps_hostapd.c

@@ -371,10 +371,17 @@ static int hapd_wps_cred_cb(struct hostapd_data *hapd, void *ctx)
 
 	fprintf(nconf, "wps_state=2\n");
 
+	if (is_hex(cred->ssid, cred->ssid_len)) {
+		fprintf(nconf, "ssid2=");
+		for (i = 0; i < cred->ssid_len; i++)
+			fprintf(nconf, "%02x", cred->ssid[i]);
+		fprintf(nconf, "\n");
+	} else {
 		fprintf(nconf, "ssid=");
 		for (i = 0; i < cred->ssid_len; i++)
 			fputc(cred->ssid[i], nconf);
 		fprintf(nconf, "\n");
+	}
 
 	if ((cred->auth_type & (WPS_AUTH_WPA2 | WPS_AUTH_WPA2PSK)) &&
 	    (cred->auth_type & (WPS_AUTH_WPA | WPS_AUTH_WPAPSK)))
@@ -464,6 +471,7 @@ static int hapd_wps_cred_cb(struct hostapd_data *hapd, void *ctx)
 			multi_bss = 1;
 		if (!multi_bss &&
 		    (str_starts(buf, "ssid=") ||
+		     str_starts(buf, "ssid2=") ||
 		     str_starts(buf, "auth_algs=") ||
 		     str_starts(buf, "wep_default_key=") ||
 		     str_starts(buf, "wep_key") ||

src/utils/common.c

@@ -566,3 +566,15 @@ char * wpa_config_parse_string(const char *value, size_t *len)
 		return (char *) str;
 	}
 }
+
+
+int is_hex(const u8 *data, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		if (data[i] < 32 || data[i] >= 127)
+			return 1;
+	}
+	return 0;
+}

src/utils/common.h

@@ -447,6 +447,7 @@ size_t printf_decode(u8 *buf, size_t maxlen, const char *str);
 const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
 
 char * wpa_config_parse_string(const char *value, size_t *len);
+int is_hex(const u8 *data, size_t len);
 
 static inline int is_zero_ether_addr(const u8 *a)
 {

wpa_supplicant/config.c

@@ -113,18 +113,6 @@ set:
 
 
 #ifndef NO_CONFIG_WRITE
-static int is_hex(const u8 *data, size_t len)
-{
-	size_t i;
-
-	for (i = 0; i < len; i++) {
-		if (data[i] < 32 || data[i] >= 127)
-			return 1;
-	}
-	return 0;
-}
-
-
 static char * wpa_config_write_string_ascii(const u8 *value, size_t len)
 {
 	char *buf;