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• Creating static NAT blocks outbound traffic Cisco ASA

  - by natediggs

  Hi Everyone, I have two web servers sitting behind a Cisco ASA 5505, which I don't have much experience with. I'm trying to create two static NATs. One static NAT that goes to xx.xx.xx.150 and another that goes to xx.xx.xx.151. I've created the static NAT for the .150 web server and it works FINE. Incoming and outgoing traffic work great. This is the staging web server. I now need to duplicate the setup for the production web server. So, I connect the webserver to the firewall, change the public IP address on one of the NICs reboot the server and I have outbound internet access. Then I run the command: static (inside,outside) xx.xx.xx.150 192.168.1.x which is successful. I then run the command: access-list acl-outside permit tcp any host xx.xx.xx.150 eq 80 Which is successful. I then try to browse the internet and I get nothing. I try to telnet in through port 80 and I get nothing (though I'm guessing because the response to the telnet request is being blocked). I've tried this with the production web server and then I tried it with another web server that is for internal testing and have the exact same problem. Both work fine until I run the static NAT rule and then no outbound internet access. I have a feeling that it's something simple that I'm missing, but my limited experience with this device is killing me. Below I've pasted the current configuration. I'm currently trying to get this to work on the .153 server which is the internal testing server. Once I can verify that works, I'll try it with production. : Saved : ASA Version 8.2(4) ! hostname QG domain-name XX.com enable password passwd names ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 ! interface Ethernet0/3 ! interface Ethernet0/4 ! interface Ethernet0/5 ! interface Ethernet0/6 ! interface Ethernet0/7 ! interface Vlan1 nameif inside security-level 100 ip address 192.168.1.1 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address XX.XX.XX.148 255.255.255.0 ! interface Vlan3 shutdown no forward interface Vlan1 nameif dmz security-level 50 ip address dhcp ! boot system disk0:/asa824.bin ftp mode passive clock timezone EST -5 clock summer-time EDT recurring dns server-group DefaultDNS domain-name fw.XXgroup.com same-security-traffic permit inter-interface access-list acl-outside extended permit tcp any host XX.XX.XX.150 eq www access-list acl-outside extended permit tcp any host XX.XX.XX.150 eq https access-list acl-outside extended permit tcp any host XX.XX.XX.151 eq www access-list acl-outside extended permit tcp any host XX.XX.XX.151 eq https access-list acl-outside extended permit tcp any host XX.XX.XX.153 eq www access-list inside_access_in extended permit ip 192.168.1.0 255.255.255.0 any access-list inside_nat0_outbound extended permit ip any 192.168.1.32 255.255.255.240 pager lines 24 logging enable logging asdm informational mtu inside 1500 mtu outside 1500 mtu dmz 1500 ip local pool VPNIPs 192.168.1.35-192.168.1.44 mask 255.255.255.0 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-635.bin no asdm history enable arp timeout 14400 global (outside) 1 interface nat (inside) 0 access-list inside_nat0_outbound nat (inside) 1 0.0.0.0 0.0.0.0 static (inside,outside) XX.XX.XX150 192.168.1.100 netmask 255.255.255.255 static (inside,outside) XX.XX.XX153 192.168.1.102 netmask 255.255.255.255 access-group acl-outside in interface outside route outside 0.0.0.0 0.0.0.0 XX.XX.XX129 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute timeout tcp-proxy-reassembly 0:01:00 dynamic-access-policy-record DfltAccessPolicy aaa authorization command LOCAL http server enable http 192.168.1.0 255.255.255.0 inside http 0.0.0.0 0.0.0.0 outside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 crypto dynamic-map outside_dyn_map 20 set pfs group1 crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map crypto map outside_map interface outside crypto isakmp enable outside crypto isakmp policy 10 authentication crack encryption 3des hash sha group 2 lifetime 86400 no crypto isakmp nat-traversal client-update enable telnet timeout 5 ssh timeout 5 console timeout 0 dhcpd auto_config outside ! dhcpd address 192.168.1.2-192.168.1.33 inside dhcpd dns 208.77.88.4 interface inside dhcpd enable inside ! threat-detection basic-threat threat-detection statistics access-list no threat-detection statistics tcp-intercept webvpn enable outside svc image disk0:/sslclient-win-1.1.0.154.pkg 1 svc image disk0:/anyconnect-win-2.5.2019-k9.pkg 2 svc enable group-policy ATSAdmin internal group-policy ATSAdmin attributes dns-server value 208.77.88.4 208.85.174.9 vpn-tunnel-protocol IPSec svc webvpn webvpn url-list none svc keep-installer installed svc rekey method ssl svc ask enable username qgadmin password /oHfeGQ/R.bd3KPR encrypted privilege 15 username benl password 0HNIGQNI0uruJvhW encrypted privilege 0 username benl attributes vpn-group-policy ATSAdmin username kuzma password rH7MM7laoynyvf9U encrypted privilege 0 username kuzma attributes vpn-group-policy ATSAdmin username nate password BXHOURyT37e4O5mt encrypted privilege 0 username nate attributes vpn-group-policy ATSAdmin tunnel-group ATSAdmin type remote-access tunnel-group ATSAdmin general-attributes address-pool VPNIPs default-group-policy ATSAdmin tunnel-group SSLVPN type remote-access tunnel-group SSLVPN general-attributes address-pool VPNIPs default-group-policy ATSAdmin ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect esmtp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp inspect ip-options ! service-policy global_policy global privilege cmd level 3 mode exec command perfmon privilege cmd level 3 mode exec command ping privilege cmd level 3 mode exec command who privilege cmd level 3 mode exec command logging privilege cmd level 3 mode exec command failover privilege show level 5 mode exec command running-config privilege show level 3 mode exec command reload privilege show level 3 mode exec command mode privilege show level 3 mode exec command firewall privilege show level 3 mode exec command interface privilege show level 3 mode exec command clock privilege show level 3 mode exec command dns-hosts privilege show level 3 mode exec command access-list privilege show level 3 mode exec command logging privilege show level 3 mode exec command ip privilege show level 3 mode exec command failover privilege show level 3 mode exec command asdm privilege show level 3 mode exec command arp privilege show level 3 mode exec command route privilege show level 3 mode exec command ospf privilege show level 3 mode exec command aaa-server privilege show level 3 mode exec command aaa privilege show level 3 mode exec command crypto privilege show level 3 mode exec command vpn-sessiondb privilege show level 3 mode exec command ssh privilege show level 3 mode exec command dhcpd privilege show level 3 mode exec command vpn privilege show level 3 mode exec command blocks privilege show level 3 mode exec command uauth privilege show level 3 mode configure command interface privilege show level 3 mode configure command clock privilege show level 3 mode configure command access-list privilege show level 3 mode configure command logging privilege show level 3 mode configure command ip privilege show level 3 mode configure command failover privilege show level 5 mode configure command asdm privilege show level 3 mode configure command arp privilege show level 3 mode configure command route privilege show level 3 mode configure command aaa-server privilege show level 3 mode configure command aaa privilege show level 3 mode configure command crypto privilege show level 3 mode configure command ssh privilege show level 3 mode configure command dhcpd privilege show level 5 mode configure command privilege privilege clear level 3 mode exec command dns-hosts privilege clear level 3 mode exec command logging privilege clear level 3 mode exec command arp privilege clear level 3 mode exec command aaa-server privilege clear level 3 mode exec command crypto privilege cmd level 3 mode configure command failover privilege clear level 3 mode configure command logging privilege clear level 3 mode configure command arp privilege clear level 3 mode configure command crypto privilege clear level 3 mode configure command aaa-server prompt hostname context call-home profile CiscoTAC-1 no active destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService destination address email [email protected] destination transport-method http subscribe-to-alert-group diagnostic subscribe-to-alert-group environment subscribe-to-alert-group inventory periodic monthly subscribe-to-alert-group configuration periodic monthly subscribe-to-alert-group telemetry periodic daily Cryptochecksum:0ed0580e151af288d865f4f3603d792a : end asdm image disk0:/asdm-635.bin no asdm history enable

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• The best way to package iPhone/iPad static libraries?

  - by Derek Clarkson

  Hi everyone, I have a couple of static Phone/iPad libraries I an working on. The problem I am looking for advise on is the best way to package the libraries. My objective is to make it easy to use the libraries in other projects and include the correct one in a build with minimal problems. To make it more interesting I currently build 4 versions of each library as follows armv6/armv7 release (devices) i386 release (simulator) armv6/armv7 debug (devices) i386 debug (simulator) The difference between the release and debug versions is that the debug versions contain a lot of NSLog(...) code which enables people to see whats going on internally as an aid to debugging. Currently when I build the whole projects I arrange the libraries into two directories like this: release lib-device.a lib-simulator.a debug lib-device.a lib-simulator.a This works ok except that when include in projects, both paths are added to the library search path and switching a target from one to the other is a pain. Or alternatively I end up with two targets. The alternative I am thinking of is to change the directories like this: release device lib.a simulator lib.a debug device lib.a simulator lib.a In playing with XCode is appears that all xcode uses the lbrary references of a project for is to get the name of the library file, which it then looks up in the library paths. Thus by parameterising the library path with the current built type and target device, I can effectively auto switch. What do you guys think? Is there a better way to do this? ciao Derek

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• (1 2 3 . #<void>)- heapsort

  - by superguay

  Hello everybody: I tried to implement a "pairing heap" with all the regular operations (merge, delete-min etc.), then I've been requested to write a function that would sort a list using my newly constructed heap implementation. Unfortunately it seems that someting goes wrong... Here's the relevant code: (define (heap-merge h1 h2) (cond ((heap-empty? h1) h2) ((heap-empty? h2) h1) (else (let ((min1 (heap-get-min h1)) (min2 (heap-get-min h2))) (if ((heap-get-less h1) min1 min2) (make-pairing-heap (heap-get-less h1) min1 (cons h2 (heap-get-subheaps h1))) (make-pairing-heap (heap-get-less h1) min2 (cons h1 (heap-get-subheaps h2)))))))) (define (heap-insert element h) (heap-merge (make-pairing-heap (heap-get-less h) element '()) h)) (define (heap-delete-min h) (define (merge-in-pairs less? subheaps) (cond ((null? subheaps) (make-heap less?)) ((null? (cdr subheaps)) (car subheaps)) (else (heap-merge (heap-merge (car subheaps) (cadr subheaps)) (merge-in-pairs less? (cddr subheaps)))))) (if (heap-empty? h) (error "expected pairing-heap for first argument, got an empty heap ") (merge-in-pairs (heap-get-less h) (heap-get-subheaps h)))) (define (heapsort l less?) (let aux ((h (accumulate heap-insert (make-heap less?) l))) (if (not (heap-empty? h)) (cons (heap-get-min h) (aux (heap-delete-min h)))))) And these are some selectors that may help you to understand the code: (define (make-pairing-heap less? min subheaps) (cons less? (cons min subheaps))) (define (make-heap less?) (cons less? '())) (define (heap-get-less h) (car h)) (define (heap-empty? h) (if (null? (cdr h)) #t #f)) Now lets get to the problem: When i run 'heapsort' it returns the sorted list with "void", as you can see: (heapsort (list 1 2 3) <) (1 2 3 . #)..HOW CAN I FIX IT? Regards, Superguay

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• Exporting static data in a DLL

  - by Gayan

  I have a DLL which contains a class with static members. I use __declspec(dllexport) in order to make use of this class's methods. But when I link it to another project and try to compile it, I get "unresolved external symbol" errors for the static data. e.g. In DLL, Test.h class __declspec(dllexport) Test{ protected: static int d; public: static void m(){} } In DLL, Test.cpp #include "Test.h" int Test::d; In the application which uses Test, I call m(). I also tried using __declspec(dllexport) for each method separately but I still get the same link errors for the static members. If I check the DLL (the .lib) using dumpbin, I could see that the symbols have been exported. For instance, the app gives the following error at link time: 1>Main.obj : error LNK2001: unresolved external symbol "protected: static int CalcEngine::i_MatrixRow" (?i_MatrixRow@CalcEngine@@1HA) But the dumpbin of the .lib contains: Version : 0 Machine : 14C (x86) TimeDateStamp: 4BA3611A Fri Mar 19 17:03:46 2010 SizeOfData : 0000002C DLL name : CalcEngine.dll Symbol name : ?i_MatrixRow@CalcEngine@@1HA (protected: static int CalcEngine::i_MatrixRow) Type : data Name type : name Hint : 31 Name : ?i_MatrixRow@CalcEngine@@1HA I can't figure out how to solve this. What am I doing wrong? How can I get over these errors? P.S. The code was originally developed for Linux and the .so/binary combination works without a problem

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• How to deal with recursive dependencies between static libraries using the binutils linker?

  - by Jack Lloyd

  I'm porting an existing system from Windows to Linux. The build is structured with multiple static libraries. I ran into a linking error where a symbol (defined in libA) could not be found in an object from libB. The linker line looked like g++ test_obj.o -lA -lB -o test The problem of course being that by the time the linker finds it needs the symbol from libA, it has already passed it by, and does not rescan, so it simply errors out even though the symbol is there for the taking. My initial idea was of course to simply swap the link (to -lB -lA) so that libA is scanned afterwards, and any symbols missing from libB that are in libA are picked up. But then I find there is actually a recursive dependency between libA and libB! I'm assuming the Visual C++ linker handles this in some way (does it rescan by default?). Ways of dealing with this I've considered: Use shared objects. Unfortunately this is undesirable from the perspective of requiring PIC compliation (this is performance sensitive code and losing %ebx to hold the GOT would really hurt), and shared objects aren't needed. Build one mega ar of all of the objects, avoiding the problem. Restructure the code to avoid the recursive dependency (which is obviously the Right Thing to do, but I'm trying to do this port with minimal changes). Do you have other ideas to deal with this? Is there some way I can convince the binutils linker to perform rescans of libraries it has already looked at when it is missing a symbol?

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• Writing a JMS Publisher without "public static void main"

  - by The Elite Gentleman

  Hi guys, Every example I've seen on the web, e.g. http://www.codeproject.com/KB/docview/jms_to_jms_bridge_activem.aspx, creates a publisher and subscriber with a public static void main method. I don't think that'll work for my web application. I'm learning JMS and I've setup Apache ActiveMQ to run on JBoss 5 and Tomcat 6 (with no glitches). I'm writing a messaging JMS service that needs to send email asynchronously. I've already written a JMS subscriber that receives the message (the class inherits MessageListener). My question is simple: How do I write a publisher that will so that my web applications can call it? Does it have to be published somewhere? My thought is to create a publisher with a no-attribute constructor (in there) and get the MessageQueue Factory, etc. from the JNDI pool (in the constructor). Is my idea correct? How do I subscribe my subscriber to the Queue Receiver? (So far, the subscriber has no constructor, and if I write a constructor, do I always subscribe myself to the Queue receiver?) Thanks for your help, sorry if my terminology is not up to scratch, there are too many java terminologies that I get lost sometimes (maybe a java GPS will do! :-) ) PS Is there a tutorial out there that explains how to write a "better" (better can mean anything, but in my case it's all about performance in high demand requests) JMS Publisher and Subscriber that I can run on Application Server such as JBoss or Glassfish? Don't forget that the JMS application will needs a "guarantee" uptime as many applications will use this.

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• The best way to build iPhone/iPad static libraries?

  - by Derek Clarkson

  Hi everyone, I have a couple of static Phone/iPad libraries I an working on. The problem I am looking for advise on is the best way to package the libraries. My objective is to make it easy to use the libraries in other projects and include the correct one in a build with minimal problems. To make it more interesting I currently build 4 versions of each library as follows armv6/armv7 release (devices) i386 release (simulator) armv6/armv7 debug (devices) i386 debug (simulator) The difference between the release and debug versions is that the debug versions contain a lot of NSLog(...) code which enables people to see whats going on internally as an aid to debugging. Currently when I build the whole projects I arrange the libraries into two directories like this: release lib-device.a lib-simulator.a debug lib-device.a lib-simulator.a This works ok except that when include in projects, both paths are added to the library search path and switching a target from one to the other is a pain. Or alternatively I end up with two targets. The alternative I am thinking of is to change the directories like this: release device lib.a simulator lib.a debug device lib.a simulator lib.a In playing with XCode is appears that all xcode uses the lbrary references of a project for is to get the name of the library file, which it then looks up in the library paths. Thus by parameterising the library path with the current built type and target device, I can effectively auto switch. What do you guys think? Is there a better way to do this? ciao Derek

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• Web CMS That Outputs to Flat Static Pages (.html) via FTP to Remote Server?

  - by Sootah

  I have a web app project that I will be starting to work on shortly. One of the features included is going to be a content management system where users can add content and then that content will be combined with a template and then output as a regular .html file. This .html file would then be FTPed to their own web host. As I've always believed in not reinventing the wheel I figured I'd see if there are any quality customizable CMSes out there that do this already do this. For instance, Blogger.com allows you to post all of your content to your account there; but offers the option to let you use your own hosting. Any time you publish a new article then a new .html page is generated (as well as an updated index page with links to the new article) and then the updated content is FTPed to your own server. What I would like is something like this that I can modify to more closely suit my needs. Required Features: Able to host on my own server Written in PHP Users add content through their account, then when posted it is FTPed as .html to their server Any appropriate pages are also updated to link to the new content (like the index page or whatnot) Templateable Customizable Optional (but very much desired) features: Written in CodeIgniter or a similar PHP framework While CodeIgniter isn't strictly required, I would very much prefer it. It speeds up development time and makes things much easier to implement. So - any suggestions? I've stumbled across a few CMSes that push to remote servers as static pages, but the ones I've found all are hosted on the developers servers which means that I cannot modify it at all. Thanks again fellow StackOverflowians! -Sootah

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• Are there pitfalls to using static class/event as an application message bus

  - by Doug Clutter

  I have a static generic class that helps me move events around with very little overhead: public static class MessageBus<T> where T : EventArgs { public static event EventHandler<T> MessageReceived; public static void SendMessage(object sender, T message) { if (MessageReceived != null) MessageReceived(sender, message); } } To create a system-wide message bus, I simply need to define an EventArgs class to pass around any arbitrary bits of information: class MyEventArgs : EventArgs { public string Message { get; set; } } Anywhere I'm interested in this event, I just wire up a handler: MessageBus<MyEventArgs>.MessageReceived += (s,e) => DoSomething(); Likewise, triggering the event is just as easy: MessageBus<MyEventArgs>.SendMessage(this, new MyEventArgs() {Message="hi mom"}); Using MessageBus and a custom EventArgs class lets me have an application wide message sink for a specific type of message. This comes in handy when you have several forms that, for example, display customer information and maybe a couple forms that update that information. None of the forms know about each other and none of them need to be wired to a static "super class". I have a couple questions: fxCop complains about using static methods with generics, but this is exactly what I'm after here. I want there to be exactly one MessageBus for each type of message handled. Using a static with a generic saves me from writing all the code that would maintain the list of MessageBus objects. Are the listening objects being kept "alive" via the MessageReceived event? For instance, perhaps I have this code in a Form.Load event: MessageBus<CustomerChangedEventArgs>.MessageReceived += (s,e) => DoReload(); When the Form is Closed, is the Form being retained in memory because MessageReceived has a reference to its DoReload method? Should I be removing the reference when the form closes: MessageBus<CustomerChangedEventArgs>.MessageReceived -= (s,e) => DoReload();

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• What's the best way to version CSS and JS URLs?

  - by David Eyk

  As per Yahoo's much-ballyhooed Best Practices for Speeding Up Your Site, we serve up static content from a CDN using far-future cache expiration headers. Of course, we need to occasionally update these "static" files, so we currently add an infix version as part of the filename (based on the SHA1 sum of the file contents). Thus: styles.min.css Becomes: styles.min.abcd1234.css However, managing the versioned files can become tedious, and I was wondering if a GET argument notation might be cleaner and better: styles.min.css?v=abcd1234 Which do you use, and why? Are there browser- or proxy/cache-related considerations that I should consider?

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• Static code analysis for new language. Where to start?

  - by tinny

  I just been given a new assignment which looks like its going to be an interesting challenge. The customer is wanting a code style checking tool to be developed for their internal (soon to be open sourced) programming language which runs on the JVM. The language syntax is very Java like. The customer basically wants me to produce something like checkstyle. So my question is this, how would you approach this problem? Given a clean slate what recommendations would you make to the customer? I think I have 3 options Write something from scratch. Id prefer not to do this as it seems like this sort of code analysis tool problem has been solved so many times that there must be a more "framework" or "platform" orientated approach. Fork an existing code style checking tool and modify the parsing to fit with this new language etc etc Extend or plug into an existing static code analysis tool. (maybe write a plugin for Yasca?) Maybe you would like to share your experiences in this area? Thanks for reading

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• Is it important to obfuscate C++ application code?

  - by user827992

  In the Java world, it seems to sometimes be a problem, but, what about C++? Are there different solutions? I was thinking about the fact that someone can replace the C++ library of a specific OS with a different version of the same library, but full of debug symbols to understand what my code does. IS tt a good thing to use standard or popular libraries? This can also happen with some dll library under Windows replaced with the "debug version" of that library. Is it better to prefer static compilation? In commercial applications, I see that for the core of their app they compile everything statically and for the most part the dlls (dynamic libraries in general) are used to offer some third party technologies like anti-piracy solutions (I see this in many games), GUI library (like Qt), OS libraries, etc. Is static compilation the equivalent to obfuscation in the Java world? In better terms, is it the best and most affordable solution to protect your code?

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• Recommended flexible website solution?

  - by Omega

  My site has a MyBB forums installation, and that is pretty much all I need. Forums. However, I need a homepage and a couple other static pages, for showing relevant information, links, etc. I don't need something fancy, all I need is something very flexible regarding theme and style editing, and just a couple simple modules, like public polls. That's all. I am very graphical, and I am looking for something to let me edit pretty much every aspect of the site. These are static pages, mainly, so I don't need something very complex. Some people tell me to use Dreamweaver, but quite honestly, that is not what I am looking for, even thought it does offer a lot of flexibility. I want something like, you know, Drupal or.. some other simple, deeply-editable in terms of graphics and style web platform. What would you recommend to me? Thank you.

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• Why does instanceof seem to work in a static generic function sometimes?

  - by michael

  Greetings. This is my first post in this site. I thought that because of type erasure, one could not expect the following code to compile, and indeed, it did not compile on an earlier version of Eclipse. My understanding was that instanceof was a run-time operator and could not know about the generic type which would be, by run-time, compiled away: public static <E extends Comparable<? super E>> void SampleForQuestion(E e) { if ( !(e instanceof String) ) System.out.println("I am not a String"); else System.out.println("I am a String"); } However, I was surprised to see that one of your threads actually included some code like this in an answer, and my latest Eclipse (Galileo on Windows with JVM 1.6 rev 20) is perfectly happy with it -- and it works, too. (I did notice that someone said it worked on Eclipse but not in another IDE/JDK in that thread, but don't remember the specifics.) Can someone explain why it works, and more importantly, because I have to guide my students, whether it should be expected to work in the future. Thank you. (I hope the code formatting comes through correctly - it looks indented correctly from my perspective and there are no tabs.)

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• Prevent mapping all public members of a class in Fluent NHibernate

  - by alimbada

  I have a class generated from a WSDL that has a bunch of public properties and a public event. I'm extending this class with my own and adding some properties to it. All of my own properties are declared virtual, but the base class properties are not virtual. I'm using Fluent NHibernate's ClassMap to map only the properties from my extended class. How do I prevent (Fluent)NHibernate from trying to persist all the base class's public members? At the moment, I get the following exception when creating the ISessionFactory: NHibernate.InvalidProxyTypeException: The following types may not be used as proxies: Type: method get_<BaseClassProperty should be 'public/protected virtual' or 'protected internal virtual' Type: method set_<BaseClassProperty should be 'public/protected virtual' or 'protected internal virtual' ... Type: method add_<BaseClassEvent should be 'public/protected virtual' or 'protected internal virtual' Type: method remove_<BaseClassEvent should be 'public/protected virtual' or 'protected internal virtual'

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• Void* array casting to float, int32, int16, etc.

  - by Griffin

  Hey guys, I've got an array of PCM data, it could be 16 bit, 24 bit packed, 32 bit, etc.. It could be signed, or unsigned, and it could be 32 or 64 bit floating point. It is currently stored as a "void**" matrix, indexed by channel, then by frame. The goal is to allow my library to take in any PCM format and buffer it, without requiring manipulation of the data to fit a designated structure. If the A/D converter spits out 24 bit packed arrays of interleaved PCM, I need to accept it gracefully. I also need to support 16 bit non interleaved, as well as any permutation of the above formats. I know the bit depth and other information at runtime, and I'm trying to code efficiently while not duplicating code. What I need is an effective way to cast the matrix, put PCM data into the matrix, and then pull it out later. I can cast the matrix to int32_t, or int16_t for the 32 and 16 bit signed PCM respectively, I'll probably have to store the 24 bit PCM in an int32_t for 32 bit, 8 bit byte systems as well. Can anyone recommend a good way to put data into this array, and pull it out later? I'd like to avoid large sections of code which look like: switch( mFormat ) { case 1: // unsigned 8 bit for( int i = 0; i < mChannels; i++ ) framesArray = (uint8_t*)pcm[i]; break; case 2: // signed 8 bit for( int i = 0; i < mChannels; i++ ) framesArray = (int8_t*)pcm[i]; break; case 3: // unsigned 16 bit ... Limitations: I'm working in C/C++, no templates, no RTTI, no STL. Think embedded. Things get trickier when I have to port this to a DSP with 16 bit bytes. Does anybody have any useful macros they might be willing to share? Thanks, -Griff

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• HREF link that targets nothing, does not want to use hash or void(0)

  - by Mattis

  I have a link that I want to be able to click to trigger a piece of jQuery code. Currently I have <a href="#" id="foo">Link</a> and $('#foo').click(function(){ // Do stuff }); which works well. But, I have always hated using hash in this way. The page flickers and the hash is added to the page url. One alternative is to use <a href="javascript:void(0);" id="foo">Link</a> but I also dislike seeing that piece of code in the browser status bar. It looks tacky. What I'd rather have is an explanatory javascript placeholder that does nothing, like <a href="javascript:zoom();" id="foo">Link</a> which actually works, but throws an ReferenceError in the javascript console since there are no such function. What's the minimum definition of a function that does nothing? Are there any other alternatives? Should I just skip the link and use something like <span id="foo" style="cursor:pointer;cursor:hand;">Link</span> instead?

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• Casting pointer to object to void * in C++

  - by JB

  I've been reading StackOverflow too much and started doubting all the code I've ever written, I keep thinking "Is that undefined behavour?" even in code that has been working for ages. So my question - Is it safe and well defined behavour to cast a pointer to an object (In this case abstract interface classes) to a void* and then later on cast them back to the original class and call method using them? I'm fully aware that the code that does this is probably awful. I wouldn't even consider writing it like this now (this is old code which I don't really want to change), so I'm not looking for a discussion of better ways to do this. I already know how to write it better if I ever did this again. But if it's actually broken to rely on this in C++ then I'll have to look at changing the code, if it's merely awful code then changing it won't be a priority. I would have had no doubts about something this simple a year or two ago but as my understanding of C++ increases I actually find I have more and more worries about code being safe under the standards even if it works perfectly well. Perhaps reading too much stack overflow is a bad thing for productivity sometimes :P

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• C++: Declare static variable in function argument list

  - by MDC

  Is there any way at all in C++ to declare a static variable while passing it to a function? I'm looking to use a macro to expand to the expression passed to the function. The expression needs to declare and initialize a static variable on that particular line (based on the filename and line number using FILE and LINE). int foo(int b) { int c = b + 2; return c; } int main() { int a = 3; a = foo(static int h = 2); //<---- see this! cout << a; return 0; } The problem I'm trying to solve is getting the filename and line number with the FILE and LINE macros provided by the preprocessor, but then creating a lookup table with integer keys leading to the FILE, LINE pairs. For example, the key 89 may map to file foo.cpp, line 20. To get this to work, I'm trying to use local static variables, so that they are initialized only once per line execution. The static variable will be initialized by calling a function that calculates the integer key and adds an entry to the lookup table if it is not there. Right now the program uses a message class to send exception information. I'm writing a macro to wrap this class into a new class: WRAPPER_MACRO(old_class_object) will expand to NewClass(old_class_object, key_value). If I add the static variable declaration as a second line right before this, it should work. The problem is that in most places in the code, the old class object is passed as an argument to a function. So the problem becomes declaring and initializing the static variable somehow with the macro, while keeping the existing function calls.

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• Objective-C Result from a Static Method saved to class instance variable giving "EXC_BAD_ACCESS" when used.

  - by KinGBin

  I am trying to store the md5 string as a class instance variable instead of the actual password. I have a static function that will return a md5 string which I'm trying to store in an instance variable instead of the actual password. I have the following setter for my class instance variable: -(void)setPassword:(NSString *)newpass{ if(newpass != password){ password = [utils md5HexDigest:newpass]; } } This will pass back the correct md5 string and save it to the password variable in my init function: [self setPassword:pword];. If I call another instance method and try to access self.password" I will get "EXC_BAD_ACCESS". I understand that the memory is getting released, but I have no clue to make sure it stays. I have tried alloc init with autorelease with no luck. This is the md5HexDigest function getting called during the init (graciously found in another stackoverflow question): + (NSString*)md5HexDigest:(NSString*)input { const char* str = [input UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5(str, strlen(str), result); NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2]; for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) { [ret appendFormat:@"%02x",result[i]]; } return ret; } Any help/pointers would be greatly appreciated. I would rather have the md5 string saved in memory than the actual password calling the md5 every time I needed to use the password. Thanks in advance.

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• When calling a static method on parent class, can the parent class deduce the type on the child (C#)

  - by Matt

  Suppose we have 2 classes, Child, and the class from which it inherits, Parent. class Parent { public static void MyFunction(){} } class Child : Parent { } Is it possible to determine in the parent class how the method was called? Because we can call it two ways: Parent.MyFunction(); Child.MyFunction(); My current approach was trying to use: MethodInfo.GetCurrentMethod().ReflectedType; // and MethodInfo.GetCurrentMethod().DeclaringType; But both appear to return the Parent type. If you are wondering what, exactly I am trying to accomplish (and why I am violating the basic OOP rule that the parent shouldn't have to know anything about the child), the short of it is this (let me know if you want the long version): I have a Model structure representing some of our data that persists to the database. All of these models inherit from an abstract Parent. This parent implements a couple of events, such as SaveEvent, DeleteEvent, etc. We want to be able to subscribe to events specific to the type. So, even though the event is in the parent, I want to be able to do: Child.SaveEvent += new EventHandler((sender, args) => {}); I have everything in place, where the event is actually backed by a dictionary of event handlers, hashed by type. The last thing I need to get working is correctly detecting the Child type, when doing Child.SaveEvent. I know I can implement the event in each child class (even forcing it through use of abstract), but it would be nice to keep it all in the parent, which is the class actually firing the events (since it implements the common save/delete/change functionality).

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• C# XNA Handle mouse events?

  - by user406470

  I'm making a 2D game engine called Clixel over on GitHub. The problem I have relates to two classes, ClxMouse and ClxButton. In it I have a mouse class - the code for that can be viewed here. ClxMouse using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Input; namespace org.clixel { public class ClxMouse : ClxSprite { private MouseState _curmouse, _lastmouse; public int Sensitivity = 3; public bool Lock = true; public Vector2 Change { get { return new Vector2(_curmouse.X - _lastmouse.X, _curmouse.Y - _lastmouse.Y); } } private int _scrollwheel; public int ScrollWheel { get { return _scrollwheel; } } public bool LeftDown { get { if (_curmouse.LeftButton == ButtonState.Pressed) return true; else return false; } } public bool RightDown { get { if (_curmouse.RightButton == ButtonState.Pressed) return true; else return false; } } public bool MiddleDown { get { if (_curmouse.MiddleButton == ButtonState.Pressed) return true; else return false; } } public bool LeftPressed { get { if (_curmouse.LeftButton == ButtonState.Pressed && _lastmouse.LeftButton == ButtonState.Released) return true; else return false; } } public bool RightPressed { get { if (_curmouse.RightButton == ButtonState.Pressed && _lastmouse.RightButton == ButtonState.Released) return true; else return false; } } public bool MiddlePressed { get { if (_curmouse.MiddleButton == ButtonState.Pressed && _lastmouse.MiddleButton == ButtonState.Released) return true; else return false; } } public bool LeftReleased { get { if (_curmouse.LeftButton == ButtonState.Released && _lastmouse.LeftButton == ButtonState.Pressed) return true; else return false; } } public bool RightReleased { get { if (_curmouse.RightButton == ButtonState.Released && _lastmouse.RightButton == ButtonState.Pressed) return true; else return false; } } public bool MiddleReleased { get { if (_curmouse.MiddleButton == ButtonState.Released && _lastmouse.MiddleButton == ButtonState.Pressed) return true; else return false; } } public MouseState CurMouse { get { return _curmouse; } } public MouseState LastMouse { get { return _lastmouse; } } public ClxMouse() : base(ClxG.Textures.Default.Cursor) { _curmouse = Mouse.GetState(); _lastmouse = _curmouse; CollisionBox = new Rectangle(ClxG.Screen.Center.X, ClxG.Screen.Center.Y, Texture.Width, Texture.Height); this.Solid = false; DefaultPosition = new Vector2(CollisionBox.X, CollisionBox.Y); Mouse.SetPosition(CollisionBox.X, CollisionBox.Y); } public ClxMouse(Texture2D _texture) : base(_texture) { _curmouse = Mouse.GetState(); _lastmouse = _curmouse; CollisionBox = new Rectangle(ClxG.Screen.Center.X, ClxG.Screen.Center.Y, Texture.Width, Texture.Height); DefaultPosition = new Vector2(CollisionBox.X, CollisionBox.Y); } public override void Update() { _lastmouse = _curmouse; _curmouse = Mouse.GetState(); if (_curmouse != _lastmouse) { if (ClxG.Game.IsActive) { _scrollwheel = _curmouse.ScrollWheelValue; Velocity = new Vector2(Change.X / Sensitivity, Change.Y / Sensitivity); if (Lock) Mouse.SetPosition(ClxG.Screen.Center.X, ClxG.Screen.Center.Y); _curmouse = Mouse.GetState(); } base.Update(); } } public override void Draw(SpriteBatch _sb) { base.Draw(_sb); } } } ClxButton using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; namespace org.clixel { public class ClxButton : ClxSprite { /// <summary> /// The color when the mouse is over the button /// </summary> public Color HoverColor; /// <summary> /// The color when the color is being clicked /// </summary> public Color ClickColor; /// <summary> /// The color when the button is inactive /// </summary> public Color InactiveColor; /// <summary> /// The color when the button is active /// </summary> public Color ActiveColor; /// <summary> /// The color after the button has been clicked. /// </summary> public Color ClickedColor; /// <summary> /// The text to be displayed on the button, set to "" if no text is needed. /// </summary> public string Text; /// <summary> /// The ClxText object to be displayed. /// </summary> public ClxText TextRender; /// <summary> /// The ClxState that should be ResetAndShow() when the button is clicked. /// </summary> public ClxState ClickState; /// <summary> /// Collision check to make sure onCollide() only runs once per frame, /// since only the mouse needs to be collision checked. /// </summary> private bool _runonce = false; /// <summary> /// Gets a value indicating whether this instance is colliding. /// </summary> /// <value> /// <c>true</c> if this instance is colliding; otherwise, <c>false</c>. /// </value> public bool IsColliding { get { return _runonce; } } /// <summary> /// Initializes a new instance of the <see cref="ClxButton"/> class. /// </summary> public ClxButton() : base(ClxG.Textures.Default.Button) { HoverColor = Color.Red; ClickColor = Color.Blue; InactiveColor = Color.Gray; ActiveColor = Color.White; ClickedColor = Color.Yellow; Text = Name + ID + " Unset!"; TextRender = new ClxText(); TextRender.Text = Text; TextRender.TextPadding = new Vector2(5, 5); ClickState = null; CollideObjects(ClxG.Mouse); } /// <summary> /// Initializes a new instance of the <see cref="ClxButton"/> class. /// </summary> /// <param name="_texture">The button texture.</param> public ClxButton(Texture2D _texture) : base(_texture) { HoverColor = Color.Red; ClickColor = Color.Blue; InactiveColor = Color.Gray; ActiveColor = Color.White; ClickedColor = Color.Yellow; Texture = _texture; Text = Name + ID; TextRender = new ClxText(); TextRender.Name = this.Name + ".TextRender"; TextRender.Text = Text; TextRender.TextPadding = new Vector2(5, 5); TextRender.Reset(); ClickState = null; CollideObjects(ClxG.Mouse); } /// <summary> /// Draws the debug information, run from ClxG.DrawDebug unless manual control is assumed. /// </summary> /// <param name="_sb">SpriteBatch used for drawing.</param> public override void DrawDebug(SpriteBatch _sb) { _runonce = false; TextRender.DrawDebug(_sb); _sb.Draw(Texture, ActualRectangle, new Rectangle(0, 0, Texture.Width, Texture.Height), DebugColor, Rotation, Origin, Flip, Layer); _sb.Draw(ClxG.Textures.Default.DebugBG, new Rectangle(ActualRectangle.X - DebugLineWidth, ActualRectangle.Y - DebugLineWidth, ActualRectangle.Width + DebugLineWidth * 2, ActualRectangle.Height + DebugLineWidth * 2), new Rectangle(0, 0, ClxG.Textures.Default.DebugBG.Width, ClxG.Textures.Default.DebugBG.Height), DebugOutline, Rotation, Origin, Flip, Layer - 0.1f); _sb.Draw(ClxG.Textures.Default.DebugBG, ActualRectangle, new Rectangle(0, 0, ClxG.Textures.Default.DebugBG.Width, ClxG.Textures.Default.DebugBG.Height), DebugBGColor, Rotation, Origin, Flip, Layer - 0.01f); } /// <summary> /// Draws using the SpriteBatch, run from ClxG.Draw unless manual control is assumed. /// </summary> /// <param name="_sb">SpriteBatch used for drawing.</param> public override void Draw(SpriteBatch _sb) { _runonce = false; TextRender.Draw(_sb); if (Visible) if (Debug) { DrawDebug(_sb); } else _sb.Draw(Texture, ActualRectangle, new Rectangle(0, 0, Texture.Width, Texture.Height), Color, Rotation, Origin, Flip, Layer); } /// <summary> /// Updates this instance. /// </summary> public override void Update() { if (this.Color != ActiveColor) this.Color = ActiveColor; TextRender.Layer = this.Layer + 0.03f; TextRender.Text = Text; TextRender.Scale = .5f; TextRender.Name = this.Name + ".TextRender"; TextRender.Origin = new Vector2(TextRender.CollisionBox.Center.X, TextRender.CollisionBox.Center.Y); TextRender.Center(this); TextRender.Update(); this.CollisionBox.Width = (int)(TextRender.CollisionBox.Width * TextRender.Scale) + (int)(TextRender.TextPadding.X * 2); this.CollisionBox.Height = (int)(TextRender.CollisionBox.Height * TextRender.Scale) + (int)(TextRender.TextPadding.Y * 2); base.Update(); } /// <summary> /// Collide event, takes the colliding object to call it's proper collision code. /// You'd want to use something like if(typeof(collider) == typeof(ClxObject) /// </summary> /// <param name="collider">The colliding object.</param> public override void onCollide(ClxObject collider) { if (!_runonce) { _runonce = true; UpdateEvents(); base.onCollide(collider); } } /// <summary> /// Updates the mouse based events. /// </summary> public void UpdateEvents() { onHover(); if (ClxG.Mouse.LeftReleased) { onLeftReleased(); return; } if (ClxG.Mouse.RightReleased) { onRightReleased(); return; } if (ClxG.Mouse.MiddleReleased) { onMiddleReleased(); return; } if (ClxG.Mouse.LeftPressed) { onLeftClicked(); return; } if (ClxG.Mouse.RightPressed) { onRightClicked(); return; } if (ClxG.Mouse.MiddlePressed) { onMiddleClicked(); return; } if (ClxG.Mouse.LeftDown) { onLeftClick(); return; } if (ClxG.Mouse.RightDown) { onRightClick(); return; } if (ClxG.Mouse.MiddleDown) { onMiddleClick(); return; } } /// <summary> /// Shows the state of the click. /// </summary> public void ShowClickState() { if (ClickState != null) { ClickState.ResetAndShow(); } } /// <summary> /// Hover event /// </summary> virtual public void onHover() { this.Color = HoverColor; } /// <summary> /// Left click event /// </summary> virtual public void onLeftClick() { this.Color = ClickColor; } /// <summary> /// Right click event /// </summary> virtual public void onRightClick() { } /// <summary> /// Middle click event /// </summary> virtual public void onMiddleClick() { } /// <summary> /// Left click event, called once per click /// </summary> virtual public void onLeftClicked() { ShowClickState(); } /// <summary> /// Right click event, called once per click /// </summary> virtual public void onRightClicked() { this.Reset(); } /// <summary> /// Middle click event, called once per click /// </summary> virtual public void onMiddleClicked() { } /// <summary> /// Ons the left released. /// </summary> virtual public void onLeftReleased() { this.Color = ClickedColor; } virtual public void onRightReleased() { } virtual public void onMiddleReleased() { } } } The issue I have is that I have all these have event styled methods, especially in ClxButton with all the onLeftClick, onRightClick, etc, etc. Is there a better way for me to handle these events to be a lot more easier for a programmer to use? I was looking at normal events on some other sites, (I'd post them but I need more rep.) and didn't really see a good way to implement delegate events into my framework. I'm not really sure how these events work, could someone possibly lay out how these events are processed for me? TL:DR * Is there a better way to handle events like this? * Are events a viable solution to this problem? Thanks in advance for any help.

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• Proxy cache zone static is unknown

  - by AnApprentice

  I'm working to setup a reverse proxy cache. In nginx.conf I added the following: location /blog { # Reverse Proxy # Cache the Blog Pages from Heroku proxy_cache STATIC; proxy_cache_valid 200 10m; proxy_cache_valid 404 1m; proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504; rewrite ^/blog$ /; rewrite ^/blog/(.*)$ /$1; proxy_pass http://whispering-retreat-1.herokuapp.com; break; } However when trying to restart nginx I received the following error: $ /opt/nginx/sbin/nginx -s stop nginx: [emerg] "proxy_cache" zone "STATIC" is unknown in /opt/nginx/conf/nginx.conf:182 Any ideas what's the problem is with using STATIC? I just want to cache the blog pages so it doesn't hit heroku every time which is horribly slow. Thanks

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• Static NAT in AWS's Virtual Private Cloud (VPC)

  - by user1050797

  Currently in a VPC with a public and a private subnet, all internet bound traffic from the private subnet could be routed via an NAT instance. The NAT instance will port address translate the packet's source IP to use the NAT instance's elastic IP, so the public server can reply to this public address. This is a PAT mechanism. My question is there a way for me to do a static NAT on my NAT instance -- Using the same NAT instance to static NAT an unassociated but reserved elastic IP to a private subnet host. This NAT instance will behave like a physical firewall doing static nat'ing for a bunch of private ip's.

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• Configure static IP with port number which will point to multiple projects on different ports

  - by Yogesh Kadam

  I am developing a project in LAM* and using the Symfony framework. I have one static IP like 99.99.99.99:8000 which points on my Linux server machine. This static IP already has port number of 8000. This Linux server machine has multiple project hosted on it and we access each project in LAN with different port number like abc:81, pqr:82, xyz:83. Is is possible to access each project on same Linux machine by this static IP? If yes then please let me know how to configure and call each project using this IP address.

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