minfrin commented on a change in pull request #382:
URL: https://github.com/apache/tomcat/pull/382#discussion_r532267259



##########
File path: java/org/apache/tomcat/util/net/AprEndpoint.java
##########
@@ -292,52 +295,79 @@ public void bind() throws Exception {
 
         // Create the pool for the server socket
         serverSockPool = Pool.create(rootPool);
+
         // Create the APR address that will be bound
-        String addressStr = null;
-        if (getAddress() != null) {
-            addressStr = getAddress().getHostAddress();
-        }
-        int family = Socket.APR_INET;
-        if (Library.APR_HAVE_IPV6) {
-            if (addressStr == null) {
-                if (!OS.IS_BSD) {
+        if (getPath() != null) {
+            if (Library.APR_HAVE_UNIX) {
+                hostname = getPath().toString();
+                family = Socket.APR_UNIX;
+            }
+            else {
+                throw new 
Exception(sm.getString("endpoint.init.unixnotavail"));
+            }
+        }
+        else {
+
+            if (getAddress() != null) {
+                hostname = getAddress().getHostAddress();
+            }
+            family = Socket.APR_INET;
+            if (Library.APR_HAVE_IPV6) {
+                if (hostname == null) {
+                    if (!OS.IS_BSD) {
+                        family = Socket.APR_UNSPEC;
+                    }
+                } else if (hostname.indexOf(':') >= 0) {
                     family = Socket.APR_UNSPEC;
                 }
-            } else if (addressStr.indexOf(':') >= 0) {
-                family = Socket.APR_UNSPEC;
             }
-         }
+        }
+
+        long sockAddress = Address.info(hostname, family, getPortWithOffset(), 
0, rootPool);
 
-        long inetAddress = Address.info(addressStr, family, 
getPortWithOffset(), 0, rootPool);
         // Create the APR server socket
-        serverSock = Socket.create(Address.getInfo(inetAddress).family,
+        if (family == Socket.APR_UNIX) {
+            serverSock = Socket.create(family, Socket.SOCK_STREAM, 0, 
rootPool);
+        }
+        else {
+            serverSock = Socket.create(Address.getInfo(sockAddress).family,
                 Socket.SOCK_STREAM,
                 Socket.APR_PROTO_TCP, rootPool);
-        if (OS.IS_UNIX) {
-            Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
-        }
-        if (Library.APR_HAVE_IPV6) {
-            if (getIpv6v6only()) {
-                Socket.optSet(serverSock, Socket.APR_IPV6_V6ONLY, 1);
-            } else {
-                Socket.optSet(serverSock, Socket.APR_IPV6_V6ONLY, 0);
+            if (OS.IS_UNIX) {
+                Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
+            }
+            if (Library.APR_HAVE_IPV6) {
+                if (getIpv6v6only()) {
+                    Socket.optSet(serverSock, Socket.APR_IPV6_V6ONLY, 1);
+                } else {
+                    Socket.optSet(serverSock, Socket.APR_IPV6_V6ONLY, 0);
+                }
             }
+            // Deal with the firewalls that tend to drop the inactive sockets
+            Socket.optSet(serverSock, Socket.APR_SO_KEEPALIVE, 1);
         }
-        // Deal with the firewalls that tend to drop the inactive sockets
-        Socket.optSet(serverSock, Socket.APR_SO_KEEPALIVE, 1);
+
         // Bind the server socket
-        int ret = Socket.bind(serverSock, inetAddress);
+        int ret = Socket.bind(serverSock, sockAddress);
         if (ret != 0) {
             throw new Exception(sm.getString("endpoint.init.bind", "" + ret, 
Error.strerror(ret)));
         }
+
         // Start listening on the server socket
         ret = Socket.listen(serverSock, getAcceptCount());
         if (ret != 0) {
             throw new Exception(sm.getString("endpoint.init.listen", "" + ret, 
Error.strerror(ret)));
         }
-        if (OS.IS_WIN32 || OS.IS_WIN64) {
-            // On Windows set the reuseaddr flag after the bind/listen
-            Socket.optSet(serverSock, Socket.APR_SO_REUSEADDR, 1);
+
+        if (family == Socket.APR_UNIX) {

Review comment:
       The umask of the whole server, which is typically 0027 - not useful for 
clients that want group write access.
   
   I went on a mission trying to figure out how to handle permissions. Java7+ 
has the PosixFilePermissions which is great for unix, but not windows. Java7+ 
also has full access to being able to set permissions via 
java.nio.file.attribute.AttributeView, but no easy way to create this from a 
string.
   
   I eventually decided that a simple "explicitly set the socket as world 
read/write" would do without being mindbendingly complex, the admin can control 
access to the socket by restricting the parent directory the socket is placed 
in, outside of the scope of tomcat.
   
   Seems like a reasonable compromise.
   




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