fixed bad referer computation in SSIs which causes a NPE during host

computation. This error was there before the latest IPv6 hack but did
not cause a NPE. The IPv6 hack was not the cause for this bug, but it
discovered the misconfiguration of the 'referer' referrer.

source/de/anomic/http/server/HTTPDFileHandler.java

@@ -1216,6 +1216,9 @@ public final class HTTPDFileHandler {
         } catch (final Exception e) {
             try {
                 // error handling
+                if (e instanceof NullPointerException) {
+                    Log.logException(e);
+                }
                 int httpStatusCode = 400;
                 final String httpStatusText = null;
                 final StringBuilder errorMessage = new StringBuilder(2000);

source/de/anomic/http/server/ServerSideIncludes.java

@@ -43,7 +43,7 @@ public class ServerSideIncludes {
         writeSSI(in, 0, out, authorization, requesthost, requestHeader);
     }
 
-    public static void writeSSI(final ByteBuffer in, int off, final OutputStream out, final String authorization, final String requesthost, final RequestHeader requestHeader) throws IOException {
+    private static void writeSSI(final ByteBuffer in, int off, final OutputStream out, final String authorization, final String requesthost, final RequestHeader requestHeader) throws IOException {
         int p = in.indexOf(ASCII.getBytes("<!--#"), off);
         int q;
         while (p >= 0) {
@@ -92,9 +92,8 @@ public class ServerSideIncludes {
         conProp.put(HeaderFramework.CONNECTION_PROP_HTTP_VER, HeaderFramework.HTTP_VERSION_0_9);
         conProp.put(HeaderFramework.CONNECTION_PROP_CLIENTIP, requesthost);
         header.put(RequestHeader.AUTHORIZATION, authorization);
-        if (requestHeader.containsKey(RequestHeader.COOKIE))
-        	header.put(RequestHeader.COOKIE, requestHeader.get(RequestHeader.COOKIE));
-        header.put(RequestHeader.REFERER, requestHeader.get(HeaderFramework.CONNECTION_PROP_PATH));
+        if (requestHeader.containsKey(RequestHeader.COOKIE)) header.put(RequestHeader.COOKIE, requestHeader.get(RequestHeader.COOKIE));
+        header.put(RequestHeader.REFERER, requestHeader.get(RequestHeader.REFERER));
         HTTPDFileHandler.doGet(conProp, header, out);
     }
 }

source/net/yacy/cora/document/MultiProtocolURI.java

@@ -327,7 +327,7 @@ public class MultiProtocolURI implements Serializable, Comparable<MultiProtocolU
             if (relPath.length() > 0 && (relPath.charAt(0) == '#' || relPath.charAt(0) == '?')) {
                 throw new MalformedURLException("relative path malformed: " + relPath);
             }
-            this.path = baseURL.path + relPath;
+            if (relPath.startsWith("/")) this.path = baseURL.path + relPath.substring(1); else this.path = baseURL.path + relPath;
         } else {
             if (relPath.length() > 0 && (relPath.charAt(0) == '#' || relPath.charAt(0) == '?')) {
                 this.path = baseURL.path + relPath;
@@ -574,6 +574,10 @@ public class MultiProtocolURI implements Serializable, Comparable<MultiProtocolU
 
     private void identPort(final String inputURL, final int dflt) throws MalformedURLException {
         // identify ref in file
+        if (this.host == null) {
+            this.port = dflt;
+            return;
+        }
         int pss = 0;
         int ip6 = this.host.indexOf('[');
         if (ip6 >= 0 && ((ip6 = this.host.indexOf("]", ip6)) > 0)) {
@@ -710,10 +714,17 @@ public class MultiProtocolURI implements Serializable, Comparable<MultiProtocolU
     }
 
     public String getHost() {
-        return (this.host.charAt(0) == '[' && this.host.charAt(this.host.length() - 1) == ']') ? this.host.substring(1, this.host.length() - 1) : this.host;
+        if (this.host == null) return null;
+        if (this.host.charAt(0) == '[') {
+            int p = this.host.indexOf(']');
+            if (p < 0) return this.host;
+            return this.host.substring(1, p);
+        }
+        return this.host;
     }
 
     public String getTLD() {
+        if (this.host == null) return "";
         int p = this.host.lastIndexOf('.');
         if (p < 0) return "";
         return this.host.substring(p + 1);

source/net/yacy/cora/protocol/Domains.java

@@ -911,10 +911,10 @@ public class Domains {
         return (noLocalCheck || // DO NOT REMOVE THIS! it is correct to return true if the check is off
                 "127.0.0.1".equals(host) ||
                 "localhost".equals(host) ||
-                host.startsWith("0:0:0:0:0:0:0:1") ||
-                host.startsWith("fe80:0:0:0:0:0:0:1") || // used by my mac as localhost
-                host.startsWith("::1/") ||
-                "::1".equals(host)
+                host.startsWith("0:0:0:0:0:0:0:1") || host.startsWith("[0:0:0:0:0:0:0:1]") ||
+                host.startsWith("fe80:0:0:0:0:0:0:1") || host.startsWith("[fe80:0:0:0:0:0:0:1]") || // used by my mac as localhost
+                host.startsWith("::1/") || host.startsWith("[::1/") ||
+                "::1".equals(host) || "[::1]".equals(host)
                 );
     }
 

source/net/yacy/cora/protocol/RequestHeader.java

@@ -50,7 +50,7 @@ public class RequestHeader extends HeaderFramework {
 
     public static final String IF_MODIFIED_SINCE = "If-Modified-Since";
     public static final String IF_RANGE = "If-Range";
-    public static final String REFERER = "Referer";
+    public static final String REFERER = "Referer"; // a misspelling of referrer that occurs as an HTTP header field. Its defined so in the http protocol, so please don't 'fix' it!
 
     private static final long serialVersionUID = 0L;