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  • How do I install and run Tomcat on port 80 as my only web server? (Rooted Ubuntu box)

    - by gav
    Hi All, tl;dr - I have a rooted linux box that I want to run tomcat on as a server (No Apache Web Server) how would you set this up avoiding common security pitfalls? I've written a Grails App that I want to run on a VPS I rent. The VPS has very little memory and I am using it for the sole purpose of running this application so I don't need the apache web server. This is my first venture into Server administration and I'm sure to fall into some well known traps. Should I use iptables to redirect requests from port 80 to 8080? Should I run tomcat as root or as it's own user? What configuration settings would be good for a low memory system expecting less than 10 concurrent users? Hopefully an easy one for you! Anyone who could link to a tutorial would be a personal hero destined for great things no doubt. Gav

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  • OpenBSD has open ports in default installation

    - by celil
    I have been considering replacing Ubuntu with OpenBSD to improve the security on my local server. I need to have ssh access to it, and I also need it to serve static web content - so the only ports I need open are 22 and 80. However, when I scan my server for open ports after installing OpenBSD 4.8, and enabling ssh and http at /etc/rc.conf httpd_flags="" sshd_flags="" I discovered that it had several other open ports: Port Scan has started… Port Scanning host: 192.168.56.102 Open TCP Port: 13 daytime Open TCP Port: 22 ssh Open TCP Port: 37 time Open TCP Port: 80 http Open TCP Port: 113 ident ssh (22) and http (80) should be open as I enabled httpd and sshd, but why are the other ports open, and should I worry about them creating additional security vulnerabilities? Should they be open in a default installation?

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  • What knowledge/expertize is required to port android to custom arm device ?

    - by Sunny
    Hi Friends, I am working on a system on which currently linux kernel and microwindows windowing system is running. Code of current linux system drivers is available to me. I want to port android on it, just as a hobby project. can you please tell me what all understanding of linux-kernel is required to port it? Please give me references (Books, Tutorials) to build-up understandings. Thanks, Sunny. P.S. I have basic understanding of linux. Configuration of device is 450 Mhz ARM9, 64 MB RAM, 256 MB NAND 480x272 resolution.

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  • How to invoke an Objective-C Block via the LLVM C++ API?

    - by smokris
    Say, for example, I have an Objective-C compiled Module that contains something like the following: typedef bool (^BoolBlock)(void); BoolBlock returnABlock(void) { return Block_copy(^bool(void){ printf("Block executing.\n"); return YES; }); } ...then, using the LLVM C++ API, I load that Module and create a CallInst to call the returnABlock() function: Function *returnABlockFunction = returnABlockModule->getFunction(std::string("returnABlock")); CallInst *returnABlockCall = CallInst::Create(returnABlockFunction, "returnABlockCall", entryBlock); How can I then invoke the Block returned via the returnABlockCall object?

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  • how to block select, move, copy, paste in vi?

    - by gojira
    I am trying to migrate from Notepad++ to vi. In N++, I constantly rely on block edit (or "column mode"), as it is a great increase in productivity: I can select a rectangular area of text by pressing ALT before marking with the mouse, and copy, move, paste the rectangular area anywhere. Also, it is possible to drag the cursor vertically so that I can type simulatenously on several subsequent lines at the same time. Is there any similar functionality for vi? If yes, how can I do that?

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  • What could cause a PHP error on an include statement?

    - by J Jones
    I've got a bug in my PHP code that's been terrorizing me for several days now. I'm trying to clasp in a new module to an existing Magento (v1.4) site, though I'm very new to the Magento framework. I think I am pretty close to getting to "Hello, World" on a block that I want displayed in the backend, but I'm getting a 500 error when the menu item is selected. I managed to track it down (using echo stmts) to a line in the Layout.php file (app\code\core\Mage\Core\Model\Layout.php, line 472ish): if (class_exists($block, false) || mageFindClassFile($block)) { $temp = $block; echo "<p>before constructor: $temp</p>"; $block = new $block($attributes); echo "<p>after constructor: $temp</p>"; } For my block, this yields only "before constructor...", so I know this is what is failing. A little more debugging reveals that the class in $block (the new block I am trying to show) does not exist. I would have expected the __autoload function to take care of this, but none of my echos in __autoload are displaying. As a last ditch effort, I tried an include statement in Mage.php to the absolute location of the block class, but similar before and after echos reveal that that include statement becomes the breaking line. I'm tempted to start thinking "permissions", but I'm not well versed in the server management side of all this, and I have limited access to the test server (the test server belongs to the client). To anticipate the question: there are no errors reported in the PHP log file. I am actually not convinced that this site is reporting errors to the log file (I haven't seen anything from this site), though the client is certain that everything is turned on. IIS 7. Integrated mode, I'm pretty sure. Anyone know what could be causing this?

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  • how limit the number of open TCP streams from same IP to a local port?

    - by JMW
    Hi, i would like to limit the number of concurrent open TCP streams from the the same IP to the server's (local) port. Let's say 4 concurrent conncetions. How can this be done with ip tables? the closest thing, that i've found was: In Apache, is there a way to limit the number of new connections per second/hour/day? iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --set iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --update --seconds 86400 --hitcount 100 -j REJECT But this limitation just messures the number of new connections over the time. This might be good for controlling HTTP traffic. But this is not a good solution for me, since my TCP streams usually have a lifetime between 5 minutes and 2 hours. thanks a lot in advance for any reply :)

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  • Can't mount home after trying to resize (bad geometry: block count exceeds size of device).

    - by Lynn
    This is on a fresh computer (super computer actually). It got to me with 15T on the home mount and 50G on the root. I tried allocating 7T to root and resizing (since I'm putting a local yum repo on this machine as it has no internet access nor will it ever). I tried following the instructions here: Centos 6.3 disk space allocation but something went wrong and the home won't mount again. Instead I get from dmesg | tail: EXT4-fs (dm-2): bad geometry: block count 4294967295 exceeds size of device (1342177280 blocks) df -h nets this output: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 7.0T 3.6G 6.6T 1% / tmpfs 190G 216K 190G 1% /dev/shm /dev/sda1 485M 38M 422M 9% /boot I didn't have any files on /dev/mapper/VolGroup-lv_home. Will simply running mke2fs fix it to be mountable? What sort of options should I run it with. I've never resized volumes before or used mke2fs. I don't want to make this mess worse.

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  • How can I reroute a sub-domain to localhost + port number?

    - by urig
    I have several web applications running on my developer machine. They mimic our production web applications which are hosted on sub-domain. For example, consider: api.myserver.com - is mimicked by 127.0.0.1:8000 www.myserver.com - is mimicked by 127.0.0.1:8008 and so on... How can I make it so that, on my Windows 7 machine, HTTP calls to "api.myserver.com" (note the lack of port number) are redirected to 127.0.0.1:8000 etc? Note that this needs to apply both to client-side calls (in the browser) and server-side calls (from IIS to Python development server and vice versa). Do I need a proxy to run locally to achieve this? Can you recommend such a tool?

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  • How to read an image from disk and block until its read?

    - by Shizam
    I'm loading 5 images from disk but I want the 1st image I read to show as soon as possible. Right now I do UIImage *img = [UIImage imageWithContentsOfFile:path]; in a for loop but since imageWithContentsOfFile:path isn't blocking all 5 images wind up getting read from disk before the first one will appear (because they're all using up I/O). I confirmed this by just load one and it appeared on screen faster than if I load all 5. I'd like to load the 1st image and block until its fully read and shown before loading the next 4 or load the 1st one and be notified when its done before loading the next 4 but I can't figure out a way to do it. None of the 'WithContentsOfFile' methods for data or image block and they don't notify or have delegate methods. Any suggestions? Thanks

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  • What block is not being tested in my test method? (VS08 Test Framework)

    - by daft
    I have the following code: private void SetControlNumbers() { string controlString = ""; int numberLength = PersonNummer.Length; switch (numberLength) { case (10) : controlString = PersonNummer.Substring(6, 4); break; case (11) : controlString = PersonNummer.Substring(7, 4); break; case (12) : controlString = PersonNummer.Substring(8, 4); break; case (13) : controlString = PersonNummer.Substring(9, 4); break; } ControlNumbers = Convert.ToInt32(controlString); } Which is tested using the following test methods: [TestMethod()] public void SetControlNumbers_Length10() { string pNummer = "9999999999"; Personnummer target = new Personnummer(pNummer); Assert.AreEqual(9999, target.ControlNumbers); } [TestMethod()] public void SetControlNumbers_Length11() { string pNummer = "999999-9999"; Personnummer target = new Personnummer(pNummer); Assert.AreEqual(9999, target.ControlNumbers); } [TestMethod()] public void SetControlNumbers_Length12() { string pNummer = "199999999999"; Personnummer target = new Personnummer(pNummer); Assert.AreEqual(9999, target.ControlNumbers); } [TestMethod()] public void SetControlNumbers_Length13() { string pNummer = "1999999-9999"; Personnummer target = new Personnummer(pNummer); Assert.AreEqual(9999, target.ControlNumbers); } For some reason Visual Studio says that I have 1 block that is not tested despite showing all code in the method under test in blue (ie. the code is covered in my unit tests). Is this because of the fact that I don't have a default value defined in the switch? When the SetControlNumbers() method is called, the string on which it operates have already been validated and checked to see that it conforms to the specification and that the various Substring calls in the switch will generate a string containing 4 chars. I'm just curious as to why it says there is 1 untested block. I'm no unit test guru at all, so I'd love some feedback on this. Also, how can I improve on the conversion after the switch to make it safer other than adding a try-catch block and check for FormatExceptions and OverflowExceptions?

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  • emacs/Python: running python-shell in line buffered vs. block buffered mode

    - by Begbie00
    Hi all - In a related question and answer here, someone hypothesized that python-shell within emacs(23.2) was block-buffered instead of line-buffered. The recommended fix was to add sys.stdout.flush() to the spot in my script where I want stdio to flush its contents to the python-shell. Is there someway to trick python-shell (running in emacs 23.2 on Windows, not Linux) into either a) thinking it's attached to a TTY or b) using line-buffered instead of block-buffered mode? I don't see why I'd be able to do this in IDLE but not emacs. I'd rather customize emacs than add sys.stdout.flush() throughout my scripts. Call me lazy :-). Thanks, Mike

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  • Using iptables to block ALL outgoing traffic from one NIC?

    - by edanfalls
    Hi, I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read! I have two NICs - eth0 and eth1 - on a linux box and I want to block ALL outbound traffic (TCP and UDP across all ports) from one of the NICs, so that no traffic makes its way back up to the router. What is the command for this? I have only seen examples with specific ports. Thanks in advance.

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  • Flash compiler error 1061: Call to a possibly undefined method run... but run exists!

    - by Zane Geiger
    So I've been working on making a game in Processing but I think Flash would be a better way to get more people playing it, so I've decided to learn Flash. The problem is that I keep getting really stupid errors on incredibly simple things. For instance, I want to make a 'Block' object to use in a platform game. So I make a new .as file, name it Block.as, and define the Block class within it like so: package { public class Block { public function Block() { // constructor code } public function run() { } } } I don't want to add the code yet, I just want to ensure that this works. So in my main timeline code, I try to create an instance of the Block object and execute its run method: var block1:Block = new Block(); block1.run(); Every time it gives me this inane error: Scene 1, Layer 'Layer 1', Frame 1, Line 2 1061: Call to a possibly undefined method run through a reference with static type Block. What undefined method!? It's defined RIGHT THERE in Block.as. The class file is even in the same folder and everything. I'm getting REALLY annoyed at how poorly Flash handles such a ridiculously simple project. Does anyone know why Flash hates me?

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  • What is the nicest way to parse this in C++ ?

    - by ereOn
    Hi, In my program, I have a list of "server address" in the following format: host[:port] The brackets here, indicate that the port is optional. host can be a hostname, an IPv4 or IPv6 address. port, if present can be a numeric port number or a service string (like: "http" or "ssh"). If port is present and host is an IPv6 address, host must be in "bracket-enclosed" notation (Example: [::1]) Here are some valid examples: localhost localhost:11211 127.0.0.1:http [::1]:11211 ::1 [::1] And an invalid example: ::1:80 // Invalid: Is this the IPv6 address ::1:80 and a default port, or the IPv6 address ::1 and the port 80 ? ::1:http // This is not ambigous, but for simplicity sake, let's consider this is forbidden as well. My goal is to separate such entries in two parts (obviously host and port). I don't care if either the host or port are invalid as long as they don't contain a : (290.234.34.34.5 is ok for host, it will be rejected in the next process); I just want to separate the two parts, or if there is no port part, to know it somehow. I tried to do something with std::stringstream but everything I come up to seems hacky and not really elegant. How would you do this in C++ ? I don't mind answers in C but C++ is prefered. Any boost solution is welcome as well. Thank you.

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  • Use .htaccess to block *All* access to specific folders.

    - by Urda
    I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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  • How do "and" and "or" work when combined in one statement?

    - by orokusaki
    For some reason this function confused me: def protocol(port): return port == "443" and "https://" or "http://" Can somebody explain the order of what's happening behind the scenes to make this work the way it does. I understood it as this until I tried it: Either A) def protocol(port): if port == "443": if bool("https://"): return True elif bool("http://"): return True return False Or B) def protocol(port): if port == "443": return True + "https://" else: return True + "http://" Is this some sort of special case in Python, or am I completely misunderstanding how statements work?

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  • Setting up a transparent proxy with only one box.

    - by Scott Chamberlain
    I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated. The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.

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  • How to manage SOAP requests to a pool of VM each listening on a HTTP port with a priority value in these requests?

    - by sputnick
    I have a front SOAP web-server under Linux. It will have to communicate with Windows Servers VM listening each on a HTTP port, for a HTTP POST request. The chosen VM should return a report of the task to the SOAP client. In the SOAP requests, there's a special variable : the priority of the request (kind of SLA), and my question is coming right now : I think of using a ha software (nginx, HAProxy, HeartBeat...) that can manage priority in this point of view. Is it relevant or do you think I need to implement a queue by myself with some specific developments? Ex: I have a SOAP requests with low priority in the pipe : the weight priority for these VM should be decreased if I have high priority SOAP requests at the same time. Any clue will be really appreciated.

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  • Enterprise Library Validation Block - Should validation be placed on class or interface?

    - by Robert MacLean
    I am not sure where the best place to put validation (using the Enterprise Library Validation Block) is? Should it be on the class or on the interface? Things that may effect it Validation rules would not be changed in classes which inherit from the interface. Validation rules would not be changed in classes which inherit from the class. Inheritance will occur from the class in most cases - I suspect some fringe cases to inherit from the interface (but I would try and avoid it). The interface main use is for DI which will be done with the Unity block.

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  • Should I use block identifiers ("end;") in my code?

    - by JosephStyons
    Code Complete says it is good practice to always use block identifiers, both for clarity and as a defensive measure. Since reading that book, I've been doing that religiously. Sometimes it seems excessive though, as in the case below. Is Steve McConnell right to insist on always using block identifiers? Which of these would you use? //naughty and brief with myGrid do for currRow := FixedRows to RowCount - 1 do if RowChanged(currRow) then if not(RecordExists(currRow)) then InsertNewRecord(currRow) else UpdateExistingRecord(currRow); //well behaved and verbose with myGrid do begin for currRow := FixedRows to RowCount - 1 do begin if RowChanged(currRow) then begin if not(RecordExists(currRow)) then begin InsertNewRecord(currRow); end //if it didn't exist, so insert it else begin UpdateExistingRecord(currRow); end; //else it existed, so update it end; //if any change end; //for each row in the grid end; //with myGrid

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