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  • Can tomcat perform ssl redirection by filtering host alias?

    - by Stephen
    Hi, We have a tomcat server (6.0.20) running one web application behind two urls, e.g. www.foo and secure.foo This is configured in the server.xml as one host with a single alias: <Host name="www.foo" appBase="webapps"> <Context docBase="foo" path=""></Context> <Alias>secure.foo</Alias> </Host> Ideally we'd like any requests to secure.foo on port 80 to be automatically redirected to use ssl. However, I can only find instructions for redirecting based on the path after the hostname, so I could add a /* security constraint but then this would apply to both urls. Does anyone know if it's possible to apply the redirection by filtering on hostname requested? (We've already got the ssl connector, certificate, etc. working ok). I know we could do it by sticking an apache server in front of tomcat and handling the redirection there, but I'm curious to know if tomcat can do this on its own. Thanks

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  • Filtering bad requests from Apache -> logger -> rsyslog to syslog-ng on a remote logging server possible?

    - by zeyus
    EDIT: Thanks for the help Here is a quick idea of the setup: webserver X In apache httpd.conf: LogFormat "%v %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" vcombined CustomLog "|/usr/bin/logger -p local6.info -t access " vcombined In rsyslog.conf: *.* @logserver Logserver syslog-ng.conf: ... parser p_apache {csv-parser(columns( "APACHE.VIRTUAL_HOST", "APACHE.CLIENT_IP", "APACHE.IDENT_NAME", "APACHE.USER_NAME", "APACHE.TIMESTAMP", "APACHE.REQUEST_URL", "APACHE.REQUEST_STATUS", "APACHE.CONTENT_LENGTH", "APACHE.REFERER", "APACHE.USER_AGENT", "APACHE.PROCESS_TIME", "APACHE.SERVER_NAME") # flags: # escape-none,escape-backslash,escape-double-char, # strip-whitespace flags(escape-double-char,strip-whitespace) delimiters(" ") quote-pairs('""[]') );}; ... source s_net { udp(ip(0.0.0.0) port(514) so_rcvbuf(1048576)); }; destination hosts_acc { file("/var/log/hosts/$HOST/${APACHE.VIRTUAL_HOST}_acc.log"); }; filter f_apacheacc { facility(local6); }; log { source(s_net); parser(p_apache); filter(f_apacheacc); destination(hosts_acc); }; ... The log's get there just fine, but there are a LOT of logs like the following: -rw------- 1 root root 5726 Apr 6 01:02 xc3\x9d\xc3\x9ed$yA;_acc.log -rw------- 1 root root 23435 Apr 6 01:06 \xc3\x9ed$yA;_acc.log -rw------- 1 root root 745 Apr 6 00:57 xc3\x9ed$yA;_acc.log -rw------- 1 root root 8440 Apr 5 22:50 \xc3\xaf_F\xc3\x95$yA;_acc.log -rw------- 1 root root 3112 Apr 6 00:58 xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA;_acc.log -rw------- 1 root root 4220 Apr 5 22:03 xe2\x80\x98\twd\xc2\xa2\xc2\xb0\xc3\x96$yA;_acc.log -rw------- 1 root root 1055 Apr 5 22:03 xe2\x80\x98\xc2\x9dw\xc3\x94\xc3\xb4T\xc5\x93$yA;_acc.log -rw------- 1 root root 1821 Apr 6 00:58 \xe2\x80\x98\xc3\x9d\xc3\x9ed$yA;_acc.log -rw------- 1 root root 2875 Apr 6 01:02 xe2\x80\x98\xc3\x9d\xc3\x9ed$yA;_acc.log -rw------- 1 root root 3165 Apr 5 22:48 \xe2\x80\x99-w\xc3\xaf_F\xc3\x95$yA;_acc.log -rw------- 1 root root 3165 Apr 5 22:40 \xe2\x80\x99\xe2\x80\x9aw\xe2\x82\xac\xc2\xbd\xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 15825 Apr 5 22:50 xe2\x80\x99\xe2\x80\x9aw\xe2\x82\xac\xc2\xbd\xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 1055 Apr 5 22:39 \xe2\x80\x9aw\xe2\x82\xac\xc2\xbd\xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 2110 Apr 5 22:50 xe2\x80\x9aw\xe2\x82\xac\xc2\xbd\xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 2034 Apr 5 22:50 \xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 4066 Apr 5 22:45 xe2\x80\x9d($yA;_acc.log -rw------- 1 root root 7212 Apr 6 13:30 \xe2\x80\xb9>$yA;_acc.log -rw------- 1 root root 3000 Apr 6 13:25 xe2\x80\xb9>$yA;_acc.log My question is where, and how can I filter these out, I don't want them on the filesystem (But actually I guess it wouldn't be a bad idea to keep them logged, but in their correct VHost file) Here is an example VHost <VirtualHost *:80> ServerAdmin [email protected] ServerName xxx.xx DocumentRoot /var/www/vhosts/xxx <Directory /var/www/vhosts/xxx> AllowOverride All Options All RewriteEngine on </Directory> </VirtualHost> And the default "catch-all" vhost at the bottom of the vhosts config file: <VirtualHost *:80> ServerName default ServerAlias * ServerAlias catchall.xxx.xx DocumentRoot /var/www/vhosts/nodomain <Directory "/var/www/vhosts/nodomain"> Options Indexes FollowSymLinks AllowOverride none Allow from All </Directory> CustomLog /dev/null combined ErrorLog /dev/null </VirtualHost> I had posted this in a related question but It's better in it's own question. Here are some examples from inside the log files r_acc.log: Apr 7 11:16:27 xxxxx access: r PC 5.0; eSobiSubscriber 2.0.4.16; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)" Apr 7 11:16:28 xxxxx access: r PC 5.0; eSobiSubscriber 2.0.4.16; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)" ######################## D46-28E2-0FBC95-78798EV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA;_acc.log: Apr 7 14:54:06 xxxxx access: D46-28E2-0FBC95-78798EV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; B557000E-F20D-35DD-021A-9824EC-17A4AFV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; 3BD03D7B-EEFD-83FF-7599-B751AD-6F0A2EV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; 9CAE0724-D455-0B31-3378-871C11-BBD0A4V\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; C1E24799-3979-2452-81-3BAA0FFD361F5A; 0E701CBC-5832-5AB6-D5-CFBF9BDE863EAA; 464714B1-B3E2-774A-A4-FEA612A46CEE06; 74C817B0-D081-D2CC-6D-C4EF0F1B4F49BB; 1338B1DE-67CD-977C-B35D-1F2C4441DD6A; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; .NET CLR 3.5.30729; .NET CLR 3.0.30729; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; .NET4.0C; BRI/2)" ######################## V\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA;_acc.log: Apr 7 14:55:04 xxxxx access: V\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; FEEACE4F-092A-1D46-28E2-0FBC95-78798EV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; B557000E-F20D-35DD-021A-9824EC-17A4AFV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; 3BD03D7B-EEFD-83FF-7599-B751AD-6F0A2EV\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; 9CAE0724-D455-0B31-3378-871C11-BBD0A4V\xe2\x80\x94w\xe2\x80\x98\xc3\x9d\xc3\x9ed$yA; C1E24799-3979-2452-81-3BAA0FFD361F5A; 0E701CBC-5832-5AB6-D5-CFBF9BDE863EAA; 464714B1-B3E2-774A-A4-FEA612A46CEE06; 74C817B0-D081-D2CC-6D-C4EF0F1B4F49BB; 1338B1DE-67CD-977C-B35D-1F2C4441DD6A; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; .NET CLR 3.5.30729; .NET CLR 3.0.30729; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; .NET4.0C; BRI/2)" ################### xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA;_acc.log: Apr 7 19:48:39 xxxxx access: xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 3C12D25C-9D40-91CF-1F40-AC-B1A083426DV-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; D4713FA8-0142-A0C2-4812-BA-E03221005BV-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 199BAF2A-ECD5-39FA-65C3-E8-B107FAFF08V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 384BDA70-9954-7744-05A0-C4-C7D9FEA685V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; EE7292A9-333C-AF70-5A7F-55-CAA7D0BA39V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; -AD7D48FA3A55-2A33-D10B-B4B66276D8B8; -166A9C6A2E71-24DF-A192-C8258AA4DE14; -00077C6C84E0-A302-4954-3D6D17C54D31; 3F56C318-EC3C-432B-680F-7E4BB2B852C4; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)" Apr 7 19:48:39 xxxxx access: xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 3C12D25C-9D40-91CF-1F40-AC-B1A083426DV-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; D4713FA8-0142-A0C2-4812-BA-E03221005BV-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 199BAF2A-ECD5-39FA-65C3-E8-B107FAFF08V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; 384BDA70-9954-7744-05A0-C4-C7D9FEA685V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; EE7292A9-333C-AF70-5A7F-55-CAA7D0BA39V-w\xc2\x90\xc3\x91\xc3\x94\xc2\xab$yA; -AD7D48FA3A55-2A33-D10B-B4B66276D8B8; -166A9C6A2E71-24DF-A192-C8258AA4DE14; -00077C6C84E0-A302-4954-3D6D17C54D31; 3F56C318-EC3C-432B-680F-7E4BB2B852C4; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)" Thanks

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  • Split horizon, route filtering, and having RIPv2 announce a non-attached route to host...

    - by Paul
    Routers A, B & C live at 10.1.1.1, 10.1.1.2 and 10.1.1.3 on a /24 metro Ethernet subnet. Each router also has its own private subnet on another interface. Router B's private subnet links thru a firewall to a 10.20.20.0 network at another organization. Router B redistributes to A and C several static routes for hosts on 10.20.20.0. However, a new host 10.20.20.5/32 must be reached via a different path that goes through router C. I know that C can advertise this host-based route with no problem, but I'd like to keep all my 10.20.20.x static routes in one place. So, how can B tell A via RIPv2 to send packets for 10.20.20.5/32 to C? So far it looks like I need no ip split-horizon on router B's 10.1.1.2 interface, perhaps because B has already learned from C other routes with a next hop of 10.1.1.3. But how does RIPv2 split horizon with no auto-summary and network 10.0.0.0 really work? If B learns a route to ANY 10.x.x.x network or host from A or C, is that enough for split horizon to keep it from redistributing ip route 10.20.20.5 255.255.255.255 10.1.1.3? And if I want to suspend split horizon only for this one new host, how do I filter out the mess of regurgitated routes that B advertises when I try no ip split-horizon? Thanks much.

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  • Why does my exchange message filtering rule not work?

    - by Jon Cage
    I have two rules set up to sort incoming bug reports. The first is specific to a single device: Apply this rule after the message arrives sent to SMS Distribution and with <source_device_number>: in the body move it to the BugReports\<source_device_number> folder ..and the second is a catch-all for everything else: Apply this rule after the message arrives sent to SMS Distribution move it to the BugReports folder For some reason though, the first rule never seems to act even though it's higher in the list. So for some reason an email like the following doesn't seem to get caught by the first rule: From: <SourceDeviceUID> To: SMS Distributor Subject: Message from <SourceDeviceUID> Message: <source_device_number>: Device encountered a problem. Details below... ...where <source_device_number> is an integer. The second rule works fine. But for some high-priority devices, I want them automatically sorted. Why might that first rule fail?

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  • How do I configure a C# web service client to send HTTP request header and body in parallel?

    - by Christopher
    Hi, I am using a traditional C# web service client generated in VS2008 .Net 3.5, inheriting from SoapHttpClientProtocol. This is connecting to a remote web service written in Java. All configuration is done in code during client initialization, and can be seen below: ServicePointManager.Expect100Continue = false; ServicePointManager.DefaultConnectionLimit = 10; var client = new APIService { EnableDecompression = true, Url = _url + "?guid=" + Guid.NewGuid(), Credentials = new NetworkCredential(user, password, null), PreAuthenticate = true, Timeout = 5000 // 5 sec }; It all works fine, but the time taken to execute the simplest method call is almost double the network ping time. Whereas a Java test client takes roughly the same as the network ping time: C# client ~ 550ms Java client ~ 340ms Network ping ~ 300ms After analyzing the TCP traffic for a session discovered the following: Basically, the C# client sent TCP packets in the following sequence. Client Send HTTP Headers in one packet. Client Waits For TCP ACK from server. Client Sends HTTP Body in one packet. Client Waits For TCP ACK from server. The Java client sent TCP packets in the following sequence. Client Sends HTTP Headers in one packet. Client Sends HTTP Body in one packet. Client Revieves ACK for first packet. Client Revieves ACK for second packet. Client Revieves ACK for second packet. Is there anyway to configure the C# web service client to send the header/body in parallel as the Java client appears to? Any help or pointers much appreciated.

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  • What is the right approach to checksumming UDP packets

    - by mr.b
    I'm building UDP server application in C#. I've come across a packet checksum problem. As you probably know, each packet should carry some simple way of telling receiver if packet data is intact. Now, UDP already has 2-byte checksum as part of header, which is optional, at least in IPv4 world. Alternative method is to have custom checksum as part of data section in each packet, and to verify it on receiver. My question boils down to: is it better to rely on (optional) checksum in UDP packet header, or to make a custom checksum implementation as part of packet data section? Perhaps the right answer depends on circumstances (as usual), so one circumstance here is that, even though code is written and developed in .NET on Windows, it might have to run under platform-independent Mono.NET, so eventual solution should be compatible with other platforms. I believe that custom checksum algorithm would be easily portable, but I'm not so sure about the first one. Any thoughts? Also, shouts about packet checksumming in general are welcome.

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  • Are there any configurable parameters to the gpsd?

    - by danatel
    I use the gpsd daemon with my application. Sometimes, the gpsd ceases to work with no apparent reason (clean sky). Even the gpsmon monitor shows no fix. Are there any parameters which must be set? Or is it a hardware problem? I am surprissed that many satellites are visible but the "Stat" bitmap does not contain the bit 7 - ephemeris data available. Should i somewhat pre-configure my position to allow for correct ephemeris data? Here is my gpsmon screen: 127.0.0.1:2947:/dev/ttyS3 SiRF binary> ^[[4~ -¦¦¦¦¦¦¦¦¦¦¦ X ¦¦¦¦¦¦ Y ¦¦¦¦¦¦ Z ¦¦¦¦¦¦¦¦¦¦ North ¦¦¦¦ East ¦¦¦¦¦ Alt ¦¦¦¦¦¦¦¦¦¬ -Pos: 3949260 1166016 4856299 m 49.89411° 16.44920° 1379 m - -Vel: 0.0 0.0 0.0 m/s 0.0 0.0 0.0 climb m/s- -Week+TOW:1578+224837.06 Day: 2 14:27:17.06 Heading: 0.0° 0.0 speed m/s- -Skew: -13.025817 TZ: -7200 HDOP: 0.0 M1:00 M2: 00 - -Fix: 0 = - L¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦ Packet type 2 (0x02) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦- -¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬-¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬ -Ch PRN Az El Stat C/N ? A --Version: - - 0 2 243 19 003f 40.4 -L¦¦¦¦¦¦¦ Packet Type 6 (0x06) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦- - 1 10 249 68 003f 43.0 --¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬ - 2 13 90 30 003f 40.9 --SVs: 0 Drift: 96506 Bias: 135976716 - - 3 7 66 67 003f 39.8 --Estimated GPS Time: 224837059 - - 4 5 295 49 003d 39.7 -L¦¦¦¦¦¦¦ Packet type 7 (0x07) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦- - 5 8 210 69 003f 41.0 --¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬ - 6 23 96 5 002d 28.0 --Max: 167.570Lat: 132.129Time: 0.075 MS: 02 - - 7 6 43 3 002d 23.1 -L¦¦¦¦¦¦¦ Packet type 9 (0x09) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦- - 8 28 163 16 003f 39.8 --¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬ - 9 0 0 0 0000 0.0 --SVs: 11 = 8 10 7 5 13 2 28 23 3 6 4 - -10 3 55 4 002d 24.7 -L¦¦¦¦¦¦¦ Packet type 13 (0x0D) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦- -11 0 0 0 0000 0.0 --¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¬ L¦¦¦ Packet Type 4 (0x04) ¦¦¦--DGPS source: 1 (SBAS) Corrections: 12 - L¦¦¦¦¦¦¦ Packet type 27 (0x1B) ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦-q

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  • NTOP gives warnings on startup

    - by FR6
    I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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  • NTOP gives warnings on startup

    - by FR6
    I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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  • How does the internet protocol handle network card numbers?

    - by Giorgio
    I know that data packets sent over the internet carry the source and destination IP address, so that the protocol can route the data to the correct destination and keep track of the source address of the packet. But what about the network card address? As far as I know, each network card has a unique identification number. Is this also transmitted with a TCP/IP packet? And when a packet is received at its destination, how is the IP address mapped to a network card number? In other words. On the sender part: does the sender store the sender network card number in the IP packets that it is sending? On the receiver part: which component maps the IP address to the receiver's network card number when a packet is received? E.g., in a home network, does the modem / router map the destination IP address of an incoming packet to a network card number and deliver the packet directly to that network card? A link to documentation on these topics would be of great help.

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  • Receiving data with Winsock

    - by Tamir
    Right now, I'm programming the networking for my online game, and I'm not really sure what to do about receiving data. The problem is that I can't really guess the packet's size, so I thought of reading just 4 bytes from the packet and converting them to an int to know what's the packet's size. Then I'll just create a buffer in that size and receive the rest of the packet, is that a good idea? For your information, I'm using non-blocking i/o.

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  • Getting XML parse error in coldfusion. Can the packet returned be validated?

    - by jeff
    Getting an error on occasion on a specific CF page. Offending code listed below. Very odd because when I rebooted CF it went away. Can the XML be checked via XMLValidate to prevent this from happening? Is this some sort of CF bug since the error disappeared after reboot of CF? I have a feeling that the error will resurface at some point. An error occured while Parsing an XML document. The element type "meta" must be terminated by the matching end-tag "". <cfhttp method="get" url="http://bs.mysite.com/webservice/rec/get.sbs?customerId=345S4BE8x&itemId=#product_id#&number=20&ruleId=#product.location_tab_accessories#"> <cfset result = xmlParse(cfhttp.FileContent)> <cfset recs = xmlSearch(result, "/result/thsite/site/itemId")>

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  • C# Begin/EndReceive - how do I read large data?

    - by ryeguy
    When reading data in chunks of say, 1024, how do I continue to read from a socket that receives a message bigger than 1024 bytes until there is no data left? Should I just use BeginReceive to read a packet's length prefix only, and then once that is retrieved, use Receive() (in the async thread) to read the rest of the packet? Or is there another way? edit: I thought Jon Skeet's link had the solution, but there is a bit of a speedbump with that code. The code I used is: public class StateObject { public Socket workSocket = null; public const int BUFFER_SIZE = 1024; public byte[] buffer = new byte[BUFFER_SIZE]; public StringBuilder sb = new StringBuilder(); } public static void Read_Callback(IAsyncResult ar) { StateObject so = (StateObject) ar.AsyncState; Socket s = so.workSocket; int read = s.EndReceive(ar); if (read > 0) { so.sb.Append(Encoding.ASCII.GetString(so.buffer, 0, read)); if (read == StateObject.BUFFER_SIZE) { s.BeginReceive(so.buffer, 0, StateObject.BUFFER_SIZE, 0, new AyncCallback(Async_Send_Receive.Read_Callback), so); return; } } if (so.sb.Length > 0) { //All of the data has been read, so displays it to the console string strContent; strContent = so.sb.ToString(); Console.WriteLine(String.Format("Read {0} byte from socket" + "data = {1} ", strContent.Length, strContent)); } s.Close(); } Now this corrected works fine most of the time, but it fails when the packet's size is a multiple of the buffer. The reason for this is if the buffer gets filled on a read it is assumed there is more data; but the same problem happens as before. A 2 byte buffer, for exmaple, gets filled twice on a 4 byte packet, and assumes there is more data. It then blocks because there is nothing left to read. The problem is that the receive function doesn't know when the end of the packet is. This got me thinking to two possible solutions: I could either have an end-of-packet delimiter or I could read the packet header to find the length and then receive exactly that amount (as I originally suggested). There's problems with each of these, though. I don't like the idea of using a delimiter, as a user could somehow work that into a packet in an input string from the app and screw it up. It also just seems kinda sloppy to me. The length header sounds ok, but I'm planning on using protocol buffers - I don't know the format of the data. Is there a length header? How many bytes is it? Would this be something I implement myself? Etc.. What should I do?

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  • How to write custom data to the TCP packet header options field with Java?

    - by snarkov
    As it is defined (see: http://www.freesoft.org/CIE/Course/Section4/8.htm) the TCP header has an 'Options' field. There are a couple of options already defined (see: www.iana.org/assignments/tcp-parameters/) but I want to come up with my very own. (For experimenting/research.) How can I get Java to write (and then read) some custom data to the options field? Bonus question: if it cannot be done with Java. what kind of application can do this? (No, I don't really feel like messing with some kernel-level TCP/IP stack implementation, I want to keep it app level.) Thanks!

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  • UDP Tracker not responding

    - by kelton52
    Alright, so I'm trying to connect to UDP trackers using c#, but I never get a response. I also don't get any errors. Here's my code. namespace UDPTester { class MainClass { public static bool messageReceived = false; public static Random Random = new Random(); public static void LOG(string format, params object[] args) { Console.WriteLine (format,args); } public static void Main (string[] args) { LOG ("Creating Packet..."); byte[] packet; using(var stream = new MemoryStream()) { var bc = new MiscUtil.Conversion.BigEndianBitConverter(); using(var br = new MiscUtil.IO.EndianBinaryWriter(bc,stream)) { LOG ("Magic Num: {0}",(Int64)0x41727101980); br.Write (0x41727101980); br.Write((Int32)0); br.Write ((Int32)Random.Next()); packet = stream.ToArray(); LOG ("Packet Size: {0}",packet.Length); } } LOG ("Connecting to tracker..."); var client = new System.Net.Sockets.UdpClient("tracker.openbittorrent.com",80); UdpState s = new UdpState(); s.e = client.Client.RemoteEndPoint; s.u = client; StartReceiving(s); LOG ("Sending Packet..."); client.Send(packet,packet.Length); while(!messageReceived) { Thread.Sleep(1000); } LOG ("Ended"); } public static void StartReceiving(UdpState state) { state.u.BeginReceive(ReceiveCallback,state); } public static void ReceiveCallback(IAsyncResult ar) { UdpClient u = (UdpClient)((UdpState)(ar.AsyncState)).u; IPEndPoint e = (IPEndPoint)((UdpState)(ar.AsyncState)).e; Byte[] receiveBytes = u.EndReceive(ar, ref e); string receiveString = Encoding.ASCII.GetString(receiveBytes); LOG("Received: {0}", receiveString); messageReceived = true; StartReceiving((UdpState)ar.AsyncState); } } public class UdpState { public UdpClient u; public EndPoint e; } } I was using a normal BinaryWriter, but that didn't work, and I read somewhere that it wants it's data in BigEndian. This doesn't work for any of the UDP trackers I've found, any ideas why I'm not getting a response? Did they maybe change the protocol and not tell anyone? HTTP trackers all work fine. Trackers I've tried udp://tracker.publicbt.com:80 udp://tracker.ccc.de:80 udp://tracker.istole.it:80 Also, I'm not interested in using MonoTorrent(and when I was using it, the UDP didn't work anyways). Protocol Sources http://xbtt.sourceforge.net/udp_tracker_protocol.html http://www.rasterbar.com/products/libtorrent/udp_tracker_protocol.html

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  • Count of memory copies in *nix systems between packet at NIC and user application?

    - by Michael_73
    Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the messaging latency even further than it does anyway (in other admittedly carefully thought-out design decisions). My question is therefore to those that grok the networking stacks on Unix or Unix-like systems. How much difference are they likely to be able to realise using this method? Feel free to answer in terms of memory copies, numbers of whales rescued or areas the size of Wales ;) Their messaging is UDP-based, as I understand it, so there's no problem with establishing TCP connections etc. Any other points of interest on this topic would be gratefully thought about! Best wishes, Mike

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  • how to allow certain packet with certian destination ports to forward using iptables?

    - by moataz metwally
    i have server and i virualized it into multiple windws vps's using kvm. i would like to make all vps behind the server firewall. to control all the ports of all vps's from the host server.i have tried to do this by that iptables file but it still blocking all the forward packets. when i remove -A FORWARD -j DROP from the file the vps will be out of the firewall control : # Generated by iptables-save v1.4.7 on Mon Oct 21 04:30:35 2013 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [49:7546] -A OUTPUT -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j DROP -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp -m multiport --dports 5901:6010,4080:4085 -j ACCEPT -A FORWARD -p tcp -s 0/0 -d 0/0 --destination-port 3389 -j ACCEPT -A INPUT -j DROP -A FORWARD -j DROP COMMIT # Completed on Mon Oct 21 04:30:35 2013 and my ifconfig output: eth0 Link encap:Ethernet HWaddr 6C:62:6D:EF:B8:77 inet6 addr: fe80::6e62:XXX:feef:b877/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4460000 errors:0 dropped:0 overruns:0 frame:0 TX packets:1825697 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:5461498823 (5.0 GiB) TX bytes:547852516 (522.4 MiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:6380 errors:0 dropped:0 overruns:0 frame:0 TX packets:6380 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6481652 (6.1 MiB) TX bytes:6481652 (6.1 MiB) natbr2 Link encap:Ethernet HWaddr 52:54:00:48:72:53 inet addr:88.XXX.XXX.X53 Bcast:88.198.242.159 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1338720 errors:0 dropped:0 overruns:0 frame:0 TX packets:3570844 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:434791198 (414.6 MiB) TX bytes:4321751647 (4.0 GiB) viif1001 Link encap:Ethernet HWaddr FE:16:3E:0F:41:D8 inet6 addr: fe80::fc16:XXX:fe0f:41d8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:358229 errors:0 dropped:0 overruns:0 frame:0 TX packets:479289 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:50127351 (47.8 MiB) TX bytes:261223068 (249.1 MiB) viif1002 Link encap:Ethernet HWaddr FE:16:3E:EA:65:FA inet6 addr: fe80::fc16:XXX:feea:65fa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:575590 errors:0 dropped:0 overruns:0 frame:0 TX packets:1489296 errors:0 dropped:0 overruns:5412 carrier:0 collisions:0 txqueuelen:500 RX bytes:243629668 (232.3 MiB) TX bytes:1724640936 (1.6 GiB) viif1003 Link encap:Ethernet HWaddr FE:16:3E:2B:85:0E inet6 addr: fe80::fc16:XXX:fe2b:850e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:413052 errors:0 dropped:0 overruns:0 frame:0 TX packets:1741801 errors:0 dropped:0 overruns:299 carrier:0 collisions:0 txqueuelen:500 RX bytes:147931054 (141.0 MiB) TX bytes:2338132498 (2.1 GiB) viifbr0 Link encap:Ethernet HWaddr 6C:62:6D:EF:B8:77 inet addr:176.XX.XX.X9 Bcast:176.9.0.95 Mask:255.255.255.224 inet6 addr: fe80::6e62:XXX:feef:b877/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2685666 errors:0 dropped:0 overruns:0 frame:0 TX packets:1472089 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4244043694 (3.9 GiB) TX bytes:523110523 (498.8 MiB)

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  • Using LINQ to search a byte array for all subarrays that start/stop with certain byte

    - by Joel B
    I'm dealing with a COM port application and we have a defined variable-length packet structure that I'm talking to a micro-controller with. The packet has delimiters for the start and stop bytes. The trouble is that sometimes the read buffer can contain extraneous characters. It seems like I'll always get the whole packet, just some extra chatter before/after the actual data. So I have a buffer that I append data to whenever new data is received from the COM port. What is the best way to search this buffer for any possible occurrences of my packet? For example: Say my packet delimiter is 0xFF and I have an array as such { 0x00, 0xFF, 0x02, 0xDA, 0xFF, 0x55, 0xFF, 0x04 } How can I create a function/LINQ-statment that returns all subarrays that start and end with the delimiter (almost like a sliding-correlator with wildcards)? The sample would return the following 3 arrays: {0xFF, 0x02, 0xDA, 0xFF}, {0xFF, 0x55, 0xFF}, and {0xFF, 0x02, 0xDA, 0xFF, 0x55, 0xFF}

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  • How to receive packets on the MCU's serial port?

    - by itisravi
    Hello, Consider this code running on my microcontroller unit(MCU): while(1){ do_stuff; if(packet_from_PC) send_data_via_gpio(new_packet); //send via general purpose i/o pins else send_data_via_gpio(default_packet); do_other_stuff; } The MCU is also interfaced to a PC via a UART.Whenever the PC sends data to the MCU, the *new_packet* is sent, otherwise the *default_packet* is sent.Each packet can be 5 or more bytes with a pre defined packet structure. My question is: 1.Should i receive the entire packet from PC using inside the UART interrut service routine (ISR)? In this case, i have to implement a state machine inside the ISR to assemble the packet (which can be lengthy with if-else or switch-case blocks). 2.Detect a REQUEST command (one byte)from the PC in my ISR set a flag, diable UART interrupt alone and form the packet in my while(1) loop by polling the UART?

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  • Linq filtering an IQueryable<T> (System.Data.Linq.DataQuery) object by a List<T> (System.Collection.

    - by Klaptrap
    My IQueryable line is: // find all timesheets for this period - from db so System.Data.Linq.DataQuery var timesheets = _timesheetRepository.FindByPeriod(dte1, dte2); My List line is: // get my team from AD - from active directory so System.Collection.Generic.List var adUsers = _adUserRepository.GetMyTeam(User.Identity.Name); I wish to only show timesheets for those users in the timesheet collection that are present in the user collection. If I use a standard c# expression such as: var teamsheets = from t in timesheets join user in adUsers on t.User1.username equals user.fullname select t; I get the error "An IQueryable that returns a self-referencing Constant expression is not supported" Any recommendations?

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  • Single Regex for filtering roman numerals from the text files.

    - by Nains
    I am stuck in between of a problem where only one pass of regular expression is allowed( some old hard code). I need the regex for roman numerals. I have tried the standard one i.e. ^(?i)M*(D?C{0,3}|C[DM])(L?X{0,3}|X[LC])(V?I{0,3}|I[VX])$, but the problem is it allows null( '') values also. Is there any way around to check is problem?

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  • "Filtering" Cells in a UITableView. Multiple Views? Subviews?

    - by Bryan Veloso
    (First question related to iPhone development, so apologies for sounding off-track.) I'm creating a view that has a few things; a UITabBarController controlling 3 UITableViews. Two of these TableViews are filtered versions of the 3rd. All of them will be making a JSON call (still working on that) to retrieve a list of objects. So, because these views are related in some way, would there be a more "sane" way to display this data? With say, subviews? Or would I have to just create 1 view for each that returns the desired data and be done with it? If it helps at all, I have full control over the API I'm talking with, so changes to that that help with this don't really matter to me too much. Thanks in advance!

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