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• Issuing multiple requests using HTTP/1.1 Pipelining

  - by Robert S. Barnes

  When using HTTP/1.1 Pipelining what does the standard say about issuing multiple requests without waiting for each request to complete? What do servers do in practice? I ask because I once tried writing a client which would issue a batch of GET requests for multiple files and remember getting errors. I wasn't sure if it was due to me incorrectly issuing the GET's or needing to wait for each individual request to finish before issuing the next GET.

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• How can I build and parse HTTP URL's / URI's / paths in Perl?

  - by Robert S. Barnes

  I have a wget-like script which downloads a page and then retrieves all the files linked in IMG tags on that page. Given the URL of the original page and the the link extracted from the IMG tag in that page I need to build the URL for the image file I want to retrieve. Currently I use a function I wrote: sub build_url { my ( $base, $path ) = @_; # if the path is absolute just prepend the domain to it if ($path =~ /^\//) { ($base) = $base =~ /^(?:http:\/\/)?(\w+(?:\.\w+)+)/; return "$base$path"; } my @base = split '/', $base; my @path = split '/', $path; # remove a trailing filename pop @base if $base =~ /[[:alnum:]]+\/[\w\d]+\.[\w]+$/; # check for relative paths my $relcount = $path =~ /(\.\.\/)/g; while ( $relcount-- ) { pop @base; shift @path; } return join '/', @base, @path; } The thing is, I'm surely not the first person solving this problem, and in fact it's such a general problem that I assume there must be some better, more standard way of dealing with it, using either a core module or something from CPAN - although via a core module is preferable. I was thinking about File::Spec but wasn't sure if it has all the functionality I would need.

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• TCP Slow Start, Congestion Avoidance & Determining Bandwidth

  - by Robert S. Barnes

  Is there a formula someplace which can be used to determine the minimum number of segments / bytes which need to be transfered across a TCP connection to determine it's bandwidth and which takes into account Slow Start and Congestion Avoidance?

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• C++ function object terminology functor, deltor, comparitor, etc..

  - by Robert S. Barnes

  Is there a commonly accepted terminology for various types for common functors? For instance I found myself naturally using comparitor for comparison functors like this: struct ciLessLibC : public std::binary_function<std::string, std::string, bool> { bool operator()(const std::string &lhs, const std::string &rhs) const { return strcasecmp(lhs.c_str(), rhs.c_str()) < 0 ? 1 : 0; } }; Or using the term deltor for something like this: struct DeleteAddrInfo { void operator()(const addr_map_t::value_type &pr) const { freeaddrinfo(pr.second); } }; If using these kinds of shorthand terms is common, it there some dictionary of them all someplace?

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• Testing for a closed socket

  - by Robert S. Barnes

  I'm trying to test for a closed socket that has been gracefully closed by the peer without incurring the latency hit of a double send to induce a SIGPIPE. One of the assumptions here is that the socket if closed was gracefully closed by the peer immediately after it's last write / send. Actual errors like a premature close are dealt with else where in the code. If the socket is still open, there will be 0 or more bytes data which I don't actually want to pull out of the socket buffer yet. I was thinking that I could call int ret = recv(sockfd, buf, 1, MSG_DONTWAIT | MSG_PEEK); to determine if the socket is still connected. If it's connected but there's no data in the buffer I'll get a return of -1 with errno == EAGAIN and return the sockfd for reuse. If it's been gracefully closed by the peer I'll get ret == 0 and open a new connection. I've tested this and it seems to work. However, I suspect there is a small window between when I recv the last bit of my data and when the peer FIN arrives in which I could get a false-positive EAGAIN from my test recv. Is this going to bite me, or is there a better way of doing this?

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• [Perl] Use a Module / Object which is defined in the same file

  - by Robert S. Barnes

  I need to define some modules and use them all in the same file. No, I can't change the requirement. I would like to do something like the following: { package FooObj; sub new { ... } sub add_data { ... } } { package BarObj; use FooObj; sub new { ... # BarObj "has a" FooObj my $self = ( myFoo => FooObj->new() ); ... } sub some_method { ... } } my $bar = BarObj->new(); However, this results in the message: Can't locate FooObj.pm in @INC ... BEGIN failed... How do I get this to work?

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• Open Source UML Tool which generates C++ code

  - by Robert S. Barnes

  Are there any open source UML tools for Linux which can generate C++ source code?

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• How can I call a Perl package I define in the same file?

  - by Robert S. Barnes

  I need to define some modules and use them all in the same file. No, I can't change the requirement. I would like to do something like the following: { package FooObj; sub new { ... } sub add_data { ... } } { package BarObj; use FooObj; sub new { ... # BarObj "has a" FooObj my $self = ( myFoo => FooObj->new() ); ... } sub some_method { ... } } my $bar = BarObj->new(); However, this results in the message: Can't locate FooObj.pm in @INC ... BEGIN failed... How do I get this to work?

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• Hitting a Button -> Executing any class function I give it in the parameters (C++)

  - by Barnes Noble

  Can anyone help me with class function parameter callbacks? I'm not so sure how to set it up in my code here: http://codepad.org/fvwHtDjQ Basically I've got a player and an enemy. I have two buttons. One button when clicked should let the player jump. The other should make the enemy hit something. When clicked, each button has to correspond to the class function in the parameters. I'm not sure how to set it up though.

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• HP Network Utility Error

  - by William Ricci

  Using the HP Network Utility to team 2 ports on Windows 2008 R2 Standard results in this error:----- An error occurred when making a call into the operating system. Happens on either of two cards that are installed. This happened before and after upgrading to PSP 9.10. Uninstalled the HP Network Configuration Utility and re-installed version 10.65.0.6. Updated NIC drivers. NC382i DP - HP Broadcom 1Gb Multifunction Driver 7.4.23.0 (from 6.2.9.0) NC365T - Intel E1R 11.14.80.0 (from 11.14.49.0)

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• Windows 8 asks DotNet 3.5 to install DotNet 3.5

  - by William.Ebe

  While trying to install some tools in Windows 8, it showed me a nice message saying it requires DotNet framework. Well, it's fine. But the bad part is I have offline installers for v2.0 and v3.5. While I'm trying to install those installers it shows me the same message as it shows above. I can't consider the web installer, because I don't want to download around 100MB. The file I have works fine for other versions like Windows 7 or XP. Any fixes?

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• How do you handle authentication across domains?

  - by William Ratcliff

  I'm trying to save users of our services from having to have multiple accounts/passwords. I'm in a large organization and there's one group that handles part of user authentication for users who are from outside the facility (primarily for administrative functions). They store a secure cookie to establish a session and communicate only via HTTPS via the browser. Sessions expire either through: 1) explicit logout of the user 2) Inactivity 3) Browser closes My team is trying to write a web application to help users analyze data that they've taken (or are currently taking) while at our facility. We need to determine if a user is 1) authenticated 2) Some identifier for that user so we can store state for them (what analysis they are working on, etc.) So, the problem is how do you authenticate across domains (the authentication server for the other application lives in a border region between public and private--we will live in the public region). We have come up with some scenarios and I'd like advice about what is best practice, or if there is one we haven't considered. Let's start with the case where the user is authenticated with the authentication server. 1) The authentication server leaves a public cookie in the browser with their primary key for a user. If this is deemed sensitive, they encrypt it on their server and we have the key to decrypt it on our server. When the user visits our site, we check for this public cookie. We extract the user_id and use a public api for the authentication server to request if the user is logged in. If they are, they send us a response with: response={ userid :we can then map this to our own user ids. If necessary, we can request additional information such as email-address/display name once (to notify them if long running jobs are done, or to share results with other people, like with google_docs). account_is_active:Make sure that the account is still valid session_is_active: Is their session still active? If we query this for a valid user, this will have a side effect that we will reset the last_time_session_activated value and thus prolong their session with the authentication server last_time_session_activated: let us know how much time they have left ip_address_session_started_from:make sure the person at our site is coming from the same ip as they started the session at } Given this response, we either accept them as authenticated and move on with our app, or redirect them to the login page for the authentication server (question: if we give an encrypted portion of the response (signed by us) with the page to redirect them to, do we open any gaping security holes in the authentication server)? The flaw that we've found with this is that if the user visits evilsite.com and they look at the session cookie and send a query to the public api of the authentication server, they can keep the session alive and if our original user leaves the machine without logging out, then the next user will be able to access their session (this was possible before, but having the session alive eternally makes this worse). 2) The authentication server redirects all requests made to our domain to us and we send responses back through them to the user. Essentially, they act as a proxy. The advantage of this is that we can handshake with the authentication server, so it's safe to be trusted with the email address/name of the user and they don't have to reenter it So, if the user tries to go to: authentication_site/mysite_page1 they are redirected to mysite. Which would you choose, or is there a better way? The goal is to minimize the "Yet Another Password/Yet another username" problem... Thanks!!!!

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• Call 'script' command and exit it from within a bash script

  - by William Jamieson

  I'm using the linux 'script' command http://www.linuxcommand.org/man_pages/script1.html to log all input and output in an interactive bash script. At the moment I have to call the script command, then run my bash script, then exit. I want to run the script and exit commands from within the actual bash script itself. How can I do this? I've tried script -a but that doesn't work for interactive scripts. Any assistance would be greatly appreciated.

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• Shutdown in background - PHP

  - by William

  I'm trying to shutdown an Ubuntu machine from PHP and am running into an issue if I want to delay the shutdown. The PHP line I'm using is: exec("sudo shutdown -h +5 &", $output); Where 5 is however many minutes in the future I want to shutdown. My problem is that this won't background and Apache hangs until either the machine is shutdown or someone else cancels the shutdown. shell_exec() has the same result. Is there another way to do this that will return immediately?

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• Windows Server 2008R2 Virtual Lab Activation strategies?

  - by William Hilsum

  I have a ESXi server that I use for testing, however, I am often needing to create additional Windows Server virtual machines. Typically, if I do not need a VM for more than 30 days, I simply do not activate. However, I have been doing a lot of HA/DRS testing recently and I have had a few servers up for more than this time. I have a MSDN account with Microsoft and have already received extra keys for Windows Server 2008 R2. I am doing nothing illegal and I am sure if I asked, they would issue more - but, I do not want to tempt fate! I have got 3 different "activated" windows snapshots I can get to at any time. If I try to clone these machines, I get the usual "did you copy or move them VM" message. If I choose copy, as far as I can see, it changes the BIOS ID and NIC MACs which is enough to disable activation. If I choose move, it keeps the activation fine (obviously, I know to change the NIC MAC - I believe I can leave the BIOS ID without problems). However, either of these options keeps the same SID code for the computer and user accounts. After the activation period has expired, as far as I can see, all that happens is optional updates do not work - it seems that the normal updates work fine. Based on this, as you can easily get in to Windows when not activated without any sort of workaround, I was wondering if it is ok just to leave a machine un activated? (However, I obviously would prefer if it was activated!) Alternatively, how dangerous is it run multiple machines on a non domain environment with the same SID? I am just interested to know if anyone can recommend a strategy for me? I have only found one solution that deals with bypassing activation - I am not interested in doing anything remotely dodgy... at a stretch, I am happy to rearm (I have never needed to keep a server past 100 days), but, I would rather have a proper strategy in place.

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• Apache restart on Ubuntu - error “could not bind to address 0.0.0.0:80”

  - by william

  I'm a n00b - trying to get apache2 set up on Ubuntu 9.10 (Karmic Koala) on Rackspace Cloud. I have set up/configured OpenSSL and installed Apache, but Apache won't start. I assume its a misconfiguration in my /etc/apache2/sites-available/ssl or /etc/apache2/sites-available/default files) When I try to restart apache using the command: sudo /etc/init.d/apache2 restart I get the following error message: [error] (EAI 2)Name or service not known: Could not resolve host name *.80 -- ignoring! [error] (EAI 2)Name or service not known: Could not resolve host name *.80 -- ignoring! (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs ...fail! For my /etc/apache2/sites-available/ssl I have used a virtual host of *:443. For my /etc/apache2/sites-available/default i have used a virtual host of *:80

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• Linking JIRA and Confluence

  - by William

  I am trying to create a trust relationship between JIRA and Confluence so that I can insert JIRA issues into Confluence documents. However, in JIRA, when I try to initiate the relationship, I receive the error: "Unable to auto-configure a Consumer as the remote Consumer-Info count not be found.". When I attempt to create the relationship from Confluence, I receive this error: "Unable to auto-configure a Consumer as the remote Consumer-Info could not be found." What am I doing wrong here?

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• Kickstarting VMWare ESX 4.1 (Error: No NIC with name bootif)

  - by William

  I'm having an issue kickstarting an installation of VMWaare ESX Classic 4.1. I've stripped down my kickstart a bit to just: accepteula keyboard us auth clearpart --firstdisk --overwritevmfs url --url=10.16.0.1/cblr/ks_mirror/esx-classic-4.1.0-260247 rootpw --iscrypted $1$zZJa3g7g$mD8d.6QgbPku1QovQTAps/ timezone 'US/Pacific' network --addvmportgroup=true --device=vmnic0 --bootproto=dhcp part '/boot' --fstype=ext3 --size=1100 --onfirstdisk part 'none' --fstype=vmkcore --size=110 --onfirstdisk part 'datastore1' --fstype=vmfs3 --size=8920 --grow --onfirstdisk virtualdisk 'esxconsole' --size=7920 --onvmfs='datastore1' part 'swap' --fstype=swap --size=916 --onvirtualdisk='esxconsole' part '/var/log' --fstype=ext3 --size=2000 --onvirtualdisk='esxconsole' part '/' --fstype=ext3 --size=5000 --grow --onvirtualdisk='esxconsole' %post --interpreter=bash However, when I attempt to use this kickstart during a PXE install with no additional kernel options, I get the following error: There was a problem with the Network Device specified on the command line. Error: No NIC found with name bootif If I comment out the network line in the kickstart, the error changes to: There was a problem with the Network Device specified on the command line. Error: No NIC found with name eth0 How can I fix this? Thanks.

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• With Apache, is it possible to generate a directory listing for a non-folder URL?

  - by William Denniss

  Apache allows you to create a directory list (when configured) if you visit a folder with no index.html. What I want to know is, is it possible to get that same list but at a different URL? I'm already using index.html and want to keep it that way. i.e., this is what I'm looking for: http://example.com/blar/ - loads my index.html page (don't want this to change) http://example.com/blar/directory_list (I want this url to render the apache directory list instead)

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• How do I install a newer version of GTK in Ubuntu without replacing the current one?

  - by William Friesen

  I am trying to compile file-roller from git, but running autogen.sh gives me this error configure: error: Package requirements (gtk+-3.0 >= 2.91.1) were not met: No package 'gtk+-3.0' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables GTK_CFLAGS and GTK_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. I am running Ubuntu Maverick and don't wish to completely replace my current version of gtk, glib, etc. I have tried to compile GTK using the --prefix argument of autogen.sh, but this gives me a similar error about my version of glib. How can I successfully compile file-roller using these new libraries without borking my install?

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• Remote desktop use two out of four monitors

  - by William Gant

  I've recently upgraded my home workstation and now have four monitors on it. I work remotely most of the time and need some way to get remote desktop onto only two of those four monitors. The top two monitors (monitors 4 & 3, going from left to right) each have a maximum resolution of 1680x1050. The bottom two monitors (1 & 2) each have a maximum resolution of 1920x1080. In my .rpd file for this remote desktop connection, I have the following keys (I've clipped it for brevity) screen mode id:i:2 use multimon:i:1 desktopwidth:i:1920 desktopheight:i:2130 session bpp:i:32 winposstr:s:0,1,3,75,1655,675 Previously I was able to get away with just doing "mstsc /span" when I had only two monitors, but that isn't working now (and isn't desirable). I'd like for the new setup to only use two of my monitors. I don't really care which two. How do I alter the .rdp file to accomplish this?

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• Managing DHCP with Cobbler and multiple NICs

  - by William

  Hi, I'm trying to setup Cobbler for PXE booting and I want it to also manage DHCP. The issue is I only want one of the two available NICs to manage DHCP. Is there a way to specify which NIC Cobbler will use for DHCP? Thank you.

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• Postfix dynamic smtp_helo_name

  - by William

  I have a mail server that relays e-mails for two different domains. I want the smtp_helo_name to be different based on the domain. I'm assuming there is no way to do this via checking the mail headers, so I was wondering if there was a way to do it by sending mail for one domain to one IP, and mail for the other to another. I tried modified master.cf to do this: localhost:smtp inet n - n - - smtpd ip1:smtp inet n - n - - smtpd ip2:smtp inet n - n - - smtpd -o myhostnamee=example2.com And setting smtp_helo_name to $myhostname in main.cf I also tried doing -o smtp_helo_name instead, neither work. Any suggestions would be great. Thanks

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• Does the mysql Client API Library version have to match the installed MySQL/Percona server version?

  - by William Jamieson

  I'm running Scientific Linux 6.3 (binary compaible with Redhat/CentOS/etc..) as a LAMP stack. I've installed Percona server and client v5.5 from the Percona yum repository. However when I run phpinfo() I notice that under the MySQL and mysqli sections, it lists the Client API Library version as 5.1.66, and not 5.5x. I'm guessing these need to match, at least to major versions, and I have no idea what the possible consequences of such a mismatch could be. Do I need to revert to Percona server and client v5.1? This is for a production environment so it needs to be right. I'd appreciate any input or experience people could offer. I'm running Scientific Linux 6.3 (binary compaible with Redhat/CentOS/etc..) as a LAMP stack. I've installed Percona server and client v5.5 from the Percona yum repository. However when I run phpinfo() I notice that under the MySQL and mysqli sections, it lists the Client API Library version as 5.1.66, and not 5.5x. I'm guessing these need to match, at least to major versions, and I have no idea what the possible consequences of such a mismatch could be. Do I need to revert to Percona server and client v5.1? This is for a production environment so it needs to be right. I'd appreciate any input or experience people could offer. (Note I will also be cross posting this on the Percona forums)

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• Eclipse Helios on OS X Snow Leopard crashes frequently when editing certain PHP files

  - by William

  I use Eclipse Helios (Eclipse Platform: 3.6.0.I20100608-0911, Eclipse IDE for PHP Developers: 1.3.0.20100617-0520) all the time on OS X (Snow Leopard), and it seems I only run into trouble whenever I'm editing a PHP file that's part of the WordPress blogging framework. When I move my cursor to a variable or function name, that often triggers the beach ball of death. I suspect Eclipse is trying to look up that variable/function and for some reason that causes an endless loop. Sometimes it's not just variables or functions. Just today I was trying to replace all occurrences of a quoted string. Every time I clicked "Replace All", the program would freeze immediately after the string was replaced and the text cursor was moved to the replaced position. I think the moving of the text cursor is important, because I got the same result when I searched for the string (thus moving the cursor), but NOT when I searched for a nonexistent string. I tried disabling everything in my preferences related to marked occurrences, hovering, code assistance, etc. Nothing helps. I use Eclipse for all my projects, and I find that it's only WordPress projects where this happens. Here's my eclipse.ini file: -startup ../../../plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar --launcher.library ../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx_1.1.0.v20100503 -product org.eclipse.epp.package.php.product --launcher.defaultAction openFile -showsplash org.eclipse.platform --launcher.XXMaxPermSize 512m --launcher.defaultAction openFile -vmargs -Dosgi.requiredJavaVersion=1.5 -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -XX:PermSize=128m -XX:MaxPermSize=128m -XX:MaxGCPauseMillis=10 -XX:MaxHeapFreeRatio=70 -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+CMSIncrementalPacing -XX:CompileThreshold=5 -Xms128m -Xmx512m -Xss2m -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -framework ../../../plugins/org.eclipse.osgi.services_3.2.100.v20100503.jar I have 4GB of RAM, so I don't know if the problem is I'm underutilizing my resources. Here's what I see over and over in the error log: !ENTRY org.eclipse.jface 2 0 2011-01-16 16:26:21.533 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2011-01-16 16:26:21.533 !MESSAGE A conflict occurred for ALT+COMMAND+Q P: Binding(ALT+COMMAND+Q P, ParameterizedCommand(Command(org.eclipse.ui.views.showView,Show View, Shows a particular view, Category(org.eclipse.ui.category.views,Views,Commands for opening views,true), org.eclipse.ui.handlers.ShowViewHandler@2a46d1, [Lorg.eclipse.ui.internal.commands.Parameter;@18f50c2,,true), [Lorg.eclipse.core.commands.Parameterization;@1ff1855), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,cocoa,system) Binding(ALT+COMMAND+Q P, ParameterizedCommand(Command(org.eclipse.ui.views.showView,Show View, Shows a particular view, Category(org.eclipse.ui.category.views,Views,Commands for opening views,true), org.eclipse.ui.handlers.ShowViewHandler@2a46d1, [Lorg.eclipse.ui.internal.commands.Parameter;@18f50c2,,true), [Lorg.eclipse.core.commands.Parameterization;@96b40c), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,cocoa,system) !ENTRY org.eclipse.core.net 1 0 2011-01-16 16:26:22.217 !MESSAGE System property http.proxyHost has been set to 127.0.0.1 by an external source. This value will be overwritten using the values from the preferences !ENTRY org.eclipse.core.net 1 0 2011-01-16 16:26:22.217 !MESSAGE System property http.proxyPort has been set to 8888 by an external source. This value will be overwritten using the values from the preferences !ENTRY org.eclipse.core.net 1 0 2011-01-16 16:26:22.218 !MESSAGE System property https.proxyHost has been set to 127.0.0.1 by an external source. This value will be overwritten using the values from the preferences !ENTRY org.eclipse.core.net 1 0 2011-01-16 16:26:22.219 !MESSAGE System property https.proxyPort has been set to 8888 by an external source. This value will be overwritten using the values from the preferences I did some experimenting with the particular script that's giving me trouble. It's a hybrid of HTML and PHP, so Eclipse has to do both HTML and PHP validation. I wondered if the HTML validation had something to do with it, so I created a new file, copied the contents over, and messed with the doctype element. I found that if I replaced the well-formed XHTML 1.0 Strict doctype element with a generic doctype (as such: <!DOCTYPE html>), then I did not crash the program just by moving the cursor around. I set all HTML validation rules to "Ignore", but it still didn't solve my problems. For now, I'm just going to echo the doctype using PHP instead of entering it literally. That seems to prevent crashes. I notice that when I move the cursor around the document, Eclipse displays the "xpath" to my current location at the bottom of the screen. Sometimes there's a delay while it figures out my current path. Perhaps when it's validating against the Strict doctype, it has problems quickly calculating the xpath as I move the cursor around? Maybe it has a stack overflow that causes it to crash.

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