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• C++: Binding to a base class

  - by Helltone

  The following code works, but I'm not sure it is correct/portable. #include <iostream> #include <tr1/functional> class base { public: base(int v) : x(v) {} protected: int x; }; class derived : public base { public: bool test() { return (x == 42); } }; int main(int argc, char* argv[]) { base b(42); if(std::tr1::bind((bool (base::*)()) &derived::test, b)()) { std::cout << "ok\n"; } return 0; }

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• Extending ENUM valus inherited from base object

  - by Tim

  Hi, If I defined a ENUM in a base object with serveral default values. When I inherit from the base object I want to add more options the the ENUM list which are specific to the inheriting object. For example my base could have a ENUM called Direction with values: None ALL Stop Start I create a new class call Compass which inherits the base class and what to add the following to the ENUM Direction. North South East West I create a new class call Navigation which inherits the base class and what to add the following to the ENUM Direction. Left Right So, In my inheriting class haow do I extend the ENUM. I am using VB.NET. Regards

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• How to set Delphi WebBrowser Base directory different that HTML location

  - by Steve

  I have a Delphi program that creates HTML files. Later when a button is pressed a TWebBrowser is created and a WebBrowser.Navigate causes the html page to display. Is there anyway to set the WebBrowser "default directory" so it will always be the location of the Delphi executable not the HTML file? I do not want to set the Base value in the HTML to a hardcoded value because then when the HTML is ran from another Delphi exe they are not found. for example: if the exe is run from D:\data\delphi\pgm.exe then the base location D:\data\delphi\ and the jpgs are at D:\data\delphi\jpgs\ but if the exe is run from: C:\stuff\pgm.exe i want the base location to be C:\stuff\ and the jpgs to be at C:\stuff\jpgs\ So I cannot write a line in the HTML with the base location since when it is ran from another exe it would point to wrong location for that exe. So I either need to set the base location when I create the webbrowser and before I read the HTML or I need a way to pass into the webbrowser the location where I can then set the base location. Sorry for being so long-winded but I could not figure out how to saw what I needed.

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• Ideas Needed for a Base Code System

  - by Tegan Snyder

  I've developed a PHP web application that is currently in need of a strategic restructuring. Currently when we setup new clients we give them the entire code base on a subdomain of our main domain and create a new table for them in the database. This results in each client having the entire codebase, meaning when we make bug changes, fixes we have to go back and apply them independently across all clients and this is a pain. What I'd like to create is a base code server that holds all the core PHP files. base.domain.com Then all of our clients (client.domain.com) will only need a few files: config.php would have the database connection information. index.php - displays the login box if session non-existant, otherwise it loads baseline code via remote includes to base.domain.com. My question is does my logic seem feasible? How do other people handle similar situations by having a base code? Also.... Is it even possbile to remotely include PHP files from base.domain.com and include them in client.domain.com? Thanks, Tegan

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• VB.NET class inherits a base class and implements an interface issue (works in C#)

  - by 300 baud

  I am trying to create a class in VB.NET which inherits a base abstract class and also implements an interface. The interface declares a string property called Description. The base class contains a string property called Description. The main class inherits the base class and implements the interface. The existence of the Description property in the base class fulfills the interface requirements. This works fine in C# but causes issues in VB.NET. First, here is an example of the C# code which works: public interface IFoo { string Description { get; set; } } public abstract class FooBase { public string Description { get; set; } } public class MyFoo : FooBase, IFoo { } Now here is the VB.NET version which gives a compiler error: Public Interface IFoo Property Description() As String End Interface Public MustInherit Class FooBase Private _Description As String Public Property Description() As String Get Return _Description End Get Set(ByVal value As String) _Description = value End Set End Property End Class Public Class MyFoo Inherits FooBase Implements IFoo End Class If I make the base class (FooBase) implement the interface and add the Implements IFoo.Description to the property all is good, but I do not want the base class to implement the interface. The compiler error is: Class 'MyFoo' must implement 'Property Description() As String' for interface 'IFoo'. Implementing property must have matching 'ReadOnly' or 'WriteOnly' specifiers. Can VB.NET not handle this, or do I need to change my syntax somewhere to get this to work?

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• Common protected data member in base class?

  - by EXP0

  I have a base class and several derived classes. The derived classes use some common data, can I just put those common data as protected member of the base class? I know the protected member breaks encapsulation sometimes, so I wonder if there is any good approach. Here is a specific example: class Base{ public: virtual void foo() = 0; void printData(); protected: std::vector<std::string> mData; } class Dr1 : public Base{ public: virtual void foo(); //could change mData } class Dr2 : public Base{ public: virtual void foo(); //could change mData } If I put mData into Dr1 and Dr2 as private member, then I need to put it in both of them, and I can not have printData() in Base since printData() need access to mData unless I make printData() virtual and have identical function in both Dr1 and Dr2, which doesn't make much sense to me. Is there a better way to approach this without using protected member? Thank you.

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• How ISP or dns server find the nameserevr [on hold]

  - by IT researcher

  I saw some articles about how DNS propagation happens.I know that ISP or DNS server(such as google public dns) cache the ip address of website which it uses to convert domain name to ip address. But my doubt is from where these ISP or dns serevr know which nameserver to go for particular domain name. for example a domain.com has two name servers ns1.domain.com and ns2.domain.com. But how the ISP server or dns server know that it uses these name server and i have to send request to this name server.So where does this record mainatined?

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• Android device unable to obtain ip address connecting to AP created with Hostapd

  - by user114392

  I have a wired internet connection that works behind an authenticated proxy server. I followed the steps mentioned here and managed to create a hotspot which my google nexus 7 detects. However, it seems stuck at "obtaining an ip address" and is not able to connect to the internet. I initially received the following error message when running the script in the terminal: dnsmasq: failed to create listening socket for 127.0.0.1: Address already in use [fail] I figured it is because of a conflict with the network manager, I commented out the "dns=dnsmasq" line in the nm configuration file. After a network-manager restart, the first error doesn't show up but I get the following: Configuration file: /etc/hostapd.conf Failed to create interface mon.wlan0: -23 (Too many open files in system) Try to remove and re-create mon.wlan0 In both cases, however, the hotspot is created and is detected by my android device. only that it cannot "obtain an ip address" and connect to it. Is it because my eth0 connects via a proxy server? Or could there be something wrong with the dnsmasq config? Any help would be appreciated.

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• Is there a decent way to maintain development of wordpress sites using the same base?

  - by Joakim Johansson

  We've been churning out wordpress sites for a while, and we'd like to keep a base repository that can be used when starting a new project, as well as updating existing sites with changes to the wordpress base. Am I wrong in assuming this would be a good thing? We take care of updating the sites, so having a common base would make this easier. I've been looking at solutions using git, such as forking a base repository and using it to pull changes to the wordpress base, but committing the site to it's own repository. Or maybe, if it's possible, storing the base as a git submodule, but this would require storing themes and plugins outside of that. Is there any common way to go about this kind of website development?

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• USB device is recognized but has no address

  - by SeanMG

  Good day folks, I'm trying to use a USRP1 with GNURadio if anyone knows what any of that is. I am running Ubuntu on a Windows 7 machine via VMware player. When I connect this USRP1 via USB 2.0 drive to Windows 7 it is recognized as Ettus Research LLC USRP1... When I connect the device to Ubuntu through VMware, it shows: usb device fffe:0002 on my removable devices. When I run lsusb I receive the following: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub Bus 001 Device 004: ID fffe:0002 When I run this program that comes with the USRP driver... uhd_find_devices I receive: -------------------------------------------------- -- UHD Device 0 -------------------------------------------------- Device Address: type: usrp1 name: serial: 00000000 So when I run this program, it does recognize the fact that this device is connected. However, the device has no address, no name, and has a null serial. I need to know the device address so I can run more programs in GNURadio. Does anyone know what the problem is here? Thanks!

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• USB device not accepting address

  - by Mike Williamson

  I have a series of machines that I am building for work that have usb card readers. When I boot them I get a long series of messages: ... [ 2347.768419] hub 1-6:1.0: unable to enumerate USB device on port 6 [ 2347.968178] usb 1-6.6: new full-speed USB device number 10 using ehci_hcd [ 2352.552020] usb 1-6.6: device not accepting address 10, error -32 [ 2352.568421] hub 1-6:1.0: unable to enumerate USB device on port 6 [ 2352.768179] usb 1-6.6: new full-speed USB device number 12 using ehci_hcd [ 2357.352033] usb 1-6.6: device not accepting address 12, error -32 ... On some older machines this only takes a few attempts before the card reader finally accepts an address, while on newer machines it can take many minutes. Changing hardware is not an option and plugging the usb card reader into a different port is only an option for the older manchines. This was a problem under 11.04 and I am now running the 12.04 beta and its still happening. Is there something I can do in the software (a udev rule perhaps?) that would fix this? Any advice appreciated. I'm happy to provide more details if you need them.

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• New site not appearing in index after change of address, no feedback from google webmaster tools

  - by Duffy

  Our change of address seems to not be taking effect. Here's the story so far: We're a web company and our product is called The New Hive. Our site used to be at thenewhive.com, but we decided to switch to newhive.com (drop the "the", it's cleaner). So the timeline of what I've tried, starting on July 29th: used 301 redirects for all pages (e.g. thenewhive.com/tag/art = newhive.com/tag/art) At this point we noticed that we had disappeared from search results when searching "The New Hive", the front page used to be all links to our site plus a couple news articles about the company. So on August 5th I: verified new domain in webmaster tools (old domain was already verified) submitted a change of address request on August 5th with Webmaster Tools / Configuration / Change of Address Then after another week, on August 13th I did this: Went to Webmaster Tools / Health / Fetch as google fetched our homepage and a couple sub pages, all successfully clicked "Submit to Index" for homepage As of today (August 23rd) we're still not showing up in the index. We're getting no warnings or feedback of any kind from the dashboard so I'm inclined to think something's broken with the dashboard rather than that something's wrong with our site from an SEO perspective. From the dashboard: No new messages or recent critical issues. Crawl Errors: No data available. From Health - Index Status: Total indexed 0 Ever crawled 42,490 Not selected 12 Blocked by robots 0 I'm really at a loss here, any help would be appreciated.

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• Paypal hide address [closed]

  - by Rob F

  I hope this question is okay for this website, to me it seemed most fitting among the stackexchange sites at least. 8) I want to release my software for free, but allow donations for it. So far, I couldn't find any option in Google Checkout to set up a donation button (and website link). I am registered as merchant, but am still waiting for my bank account verification code, that may be the reason. But then, I guess I will not be able to use it anyway because it seems the 'Donation' functionality requires to be a nonprofit organization. My understanding of 'Donation' seems to be unknown to Google (yet). So unfortunately, the one remaining option is Paypal. However, even having upgraded my account to a business account, I can find no option how to remove my living address from the Checkout pages. Basically I have nothing to hide ;) but feel uncomfortable having my address displayed publicly because of the kind of software I'm offering. We live in a world with crazy people it seems, and I don't want to have nightmares of people knocking on my doors at night. So is there a way to deactivate my address from being displayed on Paypal's checkout pages?

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• function's return address is different from its supposed value, buffer overflow,

  - by ultrajohn

  Good day everyone! I’m trying to understand how buffer overflow works. I’m doing this for my project in a computer security course I’m taking. Right now, I’m in the process of determining the address of the function’s return address which I’m supposed to change to perform a buffer overflow attack. I’ve written a simple program based from an example I’ve read in the internet. What this program does is it creates an integer pointer that will be made to point to the address of the function return address in the stack. To do this, (granted I understand how a function/program variables get organized in the stack), I add 8 to the buffer variable’ address and set it as the value of ret. I’m not doing anything here that would change the address contained in the location of func’s return address. here's the program: Output of the program when gets excecuted: As you can see, I’m printing the address of the variables buffer and ret. I’ve added an additional statement printing the value of the ret variable (supposed location of func return address, so this should print the address of the next instruction which will get executed after func returns from execution). Here is the dump which shows the supposed address of the instruction to be executed after func returns. (Underlined in green) As you can see, that value is way different from the value printed contained in the variable ret. My question is, why are they different? (of course in the assumption that what I’ve done are all right). Else, what have I done wrong? Is my understanding of the program’s runtime stack wrong? Please, help me understand this. My project is due nextweek and I’ve barely touched it yet. I’m sorry if I’m being demanding, I badly need your help.

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• How to fake source ip-address of a udp-packet?

  - by youllknow

  Hi everyone! Think about the following: Your ISP offers you a dynamic ip-address (for example 123.123.123.123). My question is simple (the answer may not): Is it possible to send a single udp-packet with a outer source-ip (for example 124.124.124.124) to a fixed-ip server? I don't need to get a answer from the server. I just want to know if/how this one way communication can be done, using a faked source-ip address. I'm sorry for my bad English! Thanks for you help in advance!

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• How to get city name based on IP address in java?

  - by Abhishek

  Is it possible to know the city name based on IP address in java?

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• How to get City, Country, and Country Code for a particular IP Address in ASP.NET?

  - by Prashant

  Hi, I am having an application in which i am storing user ip address. But now i want to store the City, Country and Country Code of the user on the basis of their ip addresses. So I am able to get the user's IP Address in ASP.NET but how to get other details. If its possible (which i don't thin it is) then tell me else tell me some alternate way to do this, is there any online FREE service using which ican get these details. How to do this in ASP.NET using C# Thanks.

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• What regex can I use to match any valid IP-address represented in dot-decimal notation?

  - by planetp

  What regex can I use to match any valid IP-address represented in dot-decimal notation?

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• How do I find the IP address of a GPRS modem?

  - by Hanno Fietz

  I want to pull data from a device that is accessed via a serial protocol and has a GPRS modem attached which should allow transparent access over an IP connection. It seems to me that this approach is upside down, because how should I know at which IP address the device currently is? Unfortunately, the device itself is rather dumb, so I can't make it send something to my server, which would reveal the current IP. For home routers on dialup lines, there's dynamic DNS services. Is there something equivalent in the mobile world? Each modem would, of course, have its phone number as a reliable address, but how does that help me? Practically all material on GPRS etc. that I can find online seems to be concerned with initiating the connection from the modem side, since that's what the system is designed for.

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• How to get ip address programactically on Debian based system?

  - by gc

  I'm trying to retrieve the ip address of the local machine in my program. The OS running is Ubuntu 8.10. I tried using gethostname() and gethostbyname to do it. All I can get is 127.0.1.1. I learned that it seems to be a Debian thing: This thread explained it. The content of my /etc/hosts file is also: 127.0.0.1 localhost 127.0.1.1 mymachine In this case, is there any other way to programactically (prefer C or C++) to get the ip address without modifying the system file on the machine? Thanks in advance. g.c.

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• How much effort does it take to spoof an Ip Address in a call to a webservice?

  - by Rory Becker

  I don't want to know how... Just how complicated.... I'm thinking of securing a webservice or 2 based on the incoming client ipaddress of the caller. Is this in any way secure? Surely if the IPaddress was being spoofed then the result would have to be sent back to the address that was being spoofed and therefore not reach the spoofer? Update: Ok so from what I can tell.... I should create a Gettoken() method which checks the IPaddress and passes out a cryptographically significant token with a timeout to any valid IP address. This is then required by any other method before any kind of side effect is allowed. Since an Attacker can't (likely) get the token without having a valid IP, he will be unable to validly call any of my "dangerous" webmethods ?

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• with nginx having the base url rewrite to https

  - by jchysk

  I'd like only my base domain www.domain.com to be rewritten to https://www.domain.com By default in my https block I have it reroute to http:// if it's not ~uri = "/" (base domain) or static content. server { listen 443; set $ssltoggle 2; if ($uri ~ ^/(img|js|css|static)/) { set $ssltoggle 1; } if ($uri = '/') { set $ssltoggle 1; } if ($ssltoggle != 1) { rewrite ^(.*)$ http://$server_name$1 permanent; } } So in my http block I need to do the rewrite if it has to https: server { listen 80; if ($uri = '/') { set $ssltoggle 1; } if ($ssltoggle = 1) { rewrite ^(.*)$ https://$server_name$1 permanent; } } If I don't have the $uri = '/' if-statement in the http block, then https works fine if I go directly to it, but I won't get redirected if I go to regular http which is expected. If I do put that in-statement in the http block then everything stops working within minutes. It might work for a few requests, but will always stop within a minute or so. In browsers I just get a blank page for all requests. If I restart nginx it continues to not work until I remove both if-statement blocks in both the https and http blocks and restart nginx. When I look in the error logs I don't see anything logged. When I look in the access log I see this message: "-" 400 0 "-" "-" which I assume means a 400 error. I don't understand why this doesn't work for me. My end goal is to have the base domain be https-only while all other pages default to http. How can I achieve this?

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• Why did MAC-Adress Cloning Fix My Router?

  - by FranticPedantic

  I have a Belkin router, and about a year ago, I suddenly lost my internet connectivity from Comcast. The internet worked fine when I plugged it right into my laptop, so I just ignored it. When I moved to another apartmnet I eventually took the dive and called tech support. The tech told me to clone my MAC address which completely fixed the issue. Now I know what a MAC address is and I've read what MAC cloning is. What has bothered me since is that I don't see how this fixed the issue. As I have understood MAC address cloning, it has the router pretend it has the same MAC address as my computer. Here is why I don't understand why this fixes my issue: I have used several different computers with this router. Cloning the MAC address fixed it for ALL of my computers. The laptop I first used with my ISP was not the one that I eventually had connected when I cloned the address. Furthermore, I didn't have any problems for quite some time after I stopped using the first computer. It wasn't like the internet suddenly stopped working when I changed which laptop I was using Now it occurred to me that maybe there was some sort of expiration? Except... Which MAC address did it clone? It was just an option in the router administration page. Did it just pick whichever computer was connected to it? If my ISP still wanted the MAC of my first computer, how did some other computer's fix it? As mentioned earlier, why did this problem seemingly stem from nowhere? Anyway, I don't have any current problems so this is more just out of general curiosity. If anybody can explain it, it would be appreciated!

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• How to pass an IP address to inet_addr?

  - by November

  I can't seem to pass an IP address to inet_addr. I have gone through the debug but I still can't figure out why this won't work. printf("Server IP\nIP:"); scanf("%s",cmdPtr); //Bind socket address.sin_family = AF_INET; address.sin_addr.s_addr = inet_addr(&cmdPtr); address.sin_port = htonl(SERVER_PORT); lenC = sizeof(address); if (connect(sdC, (struct sockaddr *) &address , lenC) < 0) { perror("Could not bind Socket\n"); return -1; }

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• IPv4 private address assignment

  - by helloworld922

  I'm working on a private network which uses static IPv4 addresses as well as DHCP addressing for the physical LAN network. At a previous company I worked at they would assign static addresses in the 10.*.*.* space and all DHCP/LAN addresses were assigned in the 192.168.*.* space. Both of these address spaces are defined in the IPv4 private address space and there were never any internal conflicts. From personal experience at home, school, at work, and pretty much any other machine I've dealt with extensively (Windows and a few Linux distros), the DHCP server would always by default choose an address from the 192.168.*.* address space. Now my question is can I rely on this behavior? Do DHCP servers always by default assign from the 192.168.*.* pool (or any pool other than the 10.*.*.* pool), leaving the 10.*.*.* pool free for private static addressing? If not, under what conditions might a DHCP server choose an address in the 10.*.*.* address space?

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