WPS: Remove duplicate networks after WPS

Each attempt to connect to the same network using WPS would result
in the duplicate configuration getting added. Avoid such redundant
additions by comparing the network configuration with an already
existing one and remove the older network if the new credential
provisioned through WPS is identical.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

wpa_supplicant/wps_supplicant.c

@@ -219,6 +219,80 @@ static void wpas_wps_security_workaround(struct wpa_supplicant *wpa_s,
 }
 
 
+static void wpas_wps_remove_dup_network(struct wpa_supplicant *wpa_s,
+					struct wpa_ssid *new_ssid)
+{
+	struct wpa_ssid *ssid, *next;
+
+	for (ssid = wpa_s->conf->ssid, next = ssid ? ssid->next : NULL; ssid;
+	     ssid = next, next = ssid ? ssid->next : NULL) {
+		/*
+		 * new_ssid has already been added to the list in
+		 * wpas_wps_add_network(), so skip it.
+		 */
+		if (ssid == new_ssid)
+			continue;
+
+		if (ssid->bssid_set || new_ssid->bssid_set) {
+			if (ssid->bssid_set != new_ssid->bssid_set)
+				continue;
+			if (os_memcmp(ssid->bssid, new_ssid->bssid, ETH_ALEN) !=
+			    0)
+				continue;
+		}
+
+		/* compare SSID */
+		if (ssid->ssid_len == 0 || ssid->ssid_len != new_ssid->ssid_len)
+			continue;
+
+		if (ssid->ssid && new_ssid->ssid) {
+			if (os_memcmp(ssid->ssid, new_ssid->ssid,
+				      ssid->ssid_len) != 0)
+				continue;
+		} else if (ssid->ssid || new_ssid->ssid)
+			continue;
+
+		/* compare security parameters */
+		if (ssid->auth_alg != new_ssid->auth_alg ||
+		    ssid->key_mgmt != new_ssid->key_mgmt ||
+		    ssid->proto != new_ssid->proto ||
+		    ssid->pairwise_cipher != new_ssid->pairwise_cipher ||
+		    ssid->group_cipher != new_ssid->group_cipher)
+			continue;
+
+		if (ssid->passphrase && new_ssid->passphrase) {
+			if (os_strlen(ssid->passphrase) !=
+			    os_strlen(new_ssid->passphrase))
+				continue;
+			if (os_strcmp(ssid->passphrase, new_ssid->passphrase) !=
+			    0)
+				continue;
+		} else if (ssid->passphrase || new_ssid->passphrase)
+			continue;
+
+		if ((ssid->psk_set || new_ssid->psk_set) &&
+		    os_memcmp(ssid->psk, new_ssid->psk, sizeof(ssid->psk)) != 0)
+			continue;
+
+		if (ssid->auth_alg == WPA_ALG_WEP) {
+			if (ssid->wep_tx_keyidx != new_ssid->wep_tx_keyidx)
+				continue;
+			if (os_memcmp(ssid->wep_key, new_ssid->wep_key,
+				      sizeof(ssid->wep_key)))
+				continue;
+			if (os_memcmp(ssid->wep_key_len, new_ssid->wep_key_len,
+				      sizeof(ssid->wep_key_len)))
+				continue;
+		}
+
+		/* Remove the duplicated older network entry. */
+		wpa_printf(MSG_DEBUG, "Remove duplicate network %d", ssid->id);
+		wpas_notify_network_removed(wpa_s, ssid);
+		wpa_config_remove_network(wpa_s->conf, ssid->id);
+	}
+}
+
+
 static int wpa_supplicant_wps_cred(void *ctx,
 				   const struct wps_credential *cred)
 {
@@ -438,6 +512,8 @@ static int wpa_supplicant_wps_cred(void *ctx,
 	if (cred->ap_channel)
 		wpa_s->wps_ap_channel = cred->ap_channel;
 
+	wpas_wps_remove_dup_network(wpa_s, ssid);
+
 #ifndef CONFIG_NO_CONFIG_WRITE
 	if (wpa_s->conf->update_config &&
 	    wpa_config_write(wpa_s->confname, wpa_s->conf)) {