I have a necessity to add support for a proprietary headers that FPGA in our design inserts in incoming Ethernet frames between MAC header and payload. Obviously have to dig in tcpdump sources and libpcap, but could anybody give some hints at where exactly to start, so that I could save time?
The first thing you need to do is to get a DLT_/LINKTYPE_ value for your proprietary headers. See the link-layer header types page on the tcpdump.org Web site for the existing DLT_/LINKTYPE_ link-layer header type values and information on how to either use one of the DLT_USERn values internally or get a new value assigned if you plan to have people outside your organization use this.
Once you have the value assigned, you'll have to do some work on libpcap:
If you've been assigned a DLT_ value, you'll have to modify the pcap/pcap.h file to add that link-layer type (and change the DLT_MATCHING_MAX value in that header file, and LINKTYPE_MATCHING_MAX in pcap-common.c, so that they are >= your DLT_ value), or wait for whoever at tcpdump.org (which will probably be me) assigns your DLT_ value and updates the libpcap Git repository (at which point you could use top-of-trunk libpcap).
If you plan to do live capturing, you may have to add a module to libpcap to support live capturing on your hardware, or, if your device looks like a regular networking device to your OS, so that you can use its native capture mechanism, modify the module for that OS to map whatever link-layer header type value the OS uses (e.g., a DLT_ value on *BSD/OS X or an ARPHRD_ value on Linux) to whatever DLT_ you're using for your link-layer header type.
You'd have to modify gencode.c to be able to compile capture filters for your DLT_ value.
Once that's done, libpcap should now work.
Now, for tcpdump:
Add an if_print routine that processes the proprietary headers (whether it just skips them or prints things for them), calls ether_print(), and then returns the sum of the length of your proprietary headers and the Ethernet header (ETHER_HDRLEN as defined in ether.h). See ether_if_print() in print-ether.c for an example.
Add a declaration of that routine to interface.h and netdissect.h, and add an entry for it, with the routine name and DLT_, to ndo_printers[] if you copied ether_if_print() (which you should) or to printers[] if you didn't (if you didn't, you'll have to pass &gndo as the first argument to ether_print()). Those arrays are in tcpdump.c.
Related
I have a bunch of .fla CS6 files that I need to export to avi (after setting up the resolution, compression settings etc) manually. I am wondering if this can be achieved via a JSFL script or similar.
Appreciate the help.
Have a look the JSFL Reference: document.exportVideo() is what you're after:
from the docs:
Usage
exportVideo( fileURI [, convertInAdobeMediaEncoder] [,
[ transparent] [, stopAtFrame] [, stopAtFrameOrTime] )
Parameters
fileURI A string, expressed as a file:/// URI, that specifies the
fully qualified path to which the video is saved.
convertInAdobeMediaEncoder A boolen value that specifies whether or
not to send the recorded video to Adobe Media Encoder. The default
value is true, which sends the video to Adobe Media Encoder. This
parameter is optional.
transparent A boolean value that specifies
whether or not the background should be included in the video. The
default value is false, which includes the movie background in the
video. This parameter is optional. stopAtFrame A boolean value that
specifies whether the video should be recorded until it reaches a
certain frame or a specific time. The default value is true, stop when
a certain frame is reached. This parameter is optional.
stopAtFrameOrTime If stopAtFrame is true, this is an int specifying
the number of frames to record. If stopAtFrame is false, this is the
number of milliseconds to record. The default value is 0 which, if
stopAtFrame is true, will record all the frames in the main timeline.
This parameter is optional.
Returns Nothing.
Description Method;
exports a video from the document and optionally sends it to Adobe
Media Encoder to convert the video
Example
The following example illustrates the use of this method:
fl.getDocumentDOM().exportVideo("file:///C|/myProject/myVideo.mov");
I can't remember if that is in AVI format, however you should be able to convert the video. Setting the second parameter (convertInAdobeMediaEncoder) to true should send the video to Media Encoder for conversion, however it will be a lot less straight forward to automate that (very convoluted, but not impossible)
Alternatively I would recommend looking into exporting a PNG sequence that you can then convert to any video format you would like with ffmpeg or similar tools, baring in mind you could trigger the conversion process from JSFL (via FLfile.runCommandLine for example).
In short:
use the JSFL reference (e.g. document.exportVideo(), etc.)
prototype with a simple through away script and a short timeline
test/fix/clean/comment code for the full version of the script after all your questions are answered by prototypes
How can I send a gel:email to multiple recipients? I have records with 3 email addresses in each and I want to send the same email to all 3.
This is my current code:
<core:forEach items="${getDetails.rows}" var="row">
<core:set value="${row.Manager_Email}" var="manager" />
<core:set value="${row.Delivery_Manager_Email}" var="deliveryManager" />
<core:set value="${row.Director_Email}" var="director" />
<core:choose>
<core:when test="${status == 1}">
<gel:email from="Clarity_Do-Not-Reply#gov.nl.ca" fromName="Clarity Administrator" to="${manager};${deliveryManager};${director}" subject="Notification: Project is due to finish within 7 days">
I've tried that and:
to="${manager;deliveryManager;director}"
Neither seem to work. The doc says they can be split with the ; but it doesn't seem to be working. What am I doing wrong?
Does it work with just one of them? I would start and establish that the mail server works in this environment. Choose one of those variables and print it out. If it's not what you are expecting then fix your query or wherever you are getting those bound variables. If it is correct then remove the other two recipients and establish that you can send an email successfully to just one of the recipients. If that works then continue troubleshooting.
If it doesn't work then you may discover that your mail server does not allow relaying, unauthenticated services or sending mail from a non-existent email account. You can start checking those things.
One of the issues with both the GEL email tag and the CORE email tag is that it doesn't support including the same email address twice. If you check your project you might find that the same resource is listed as both delivery manager and manager or director, etc. This is a problem for the tag.
You can get around this by placing all recipients into a data structure that doesn't allow duplicates (like a hash map/set) and then iterate them out back into a semi colon delimited String.
There are probably lots of examples of this type of thing on regoXchange, a huge repository of free GEL scripts and Clarity related customizations and development.
This approach that was in your original script example is the correct way to do it: to="${manager};${deliveryManager};${director}"
That is, using a single delimiter type (semi-colon in this case) to separate each evaluated variable value.
The style from your second attempt definitely will not work as ${manager;deliveryManager;director} is not a valid JEXL expression.
There are additional points to be aware of, such as:
Each of the values in the to attribute should not have anything else that can be mistaken for another delimiter type (e.g. no spaces or commas), as you may not mix and match.
Only use the email address directly, meaning some.one#somedomain.com and don't use forms like "One, Some" <some.one#somedomain.com>
Make sure none of the email addresses are duplicated in the list. Every address must be unique. As mentioned in the answer provided by #coda, you can filter duplicates out with some extra GEL or you can put the logic into your query (the row source) to de-duplicate.
If this is running in a SaaS environment, make sure none of the user addresses you are picking up are among the defaults for some built-in user accounts like username#mailserver.com or similar, as they have resulted in emails being filtered out before sending.
I am trying various different options of building Asterisk 11 and these will be deployed on various servers. They are all built from the same sources and have what I presume to be some sort of checksum embedded in the version ID (26dd464).
In order to distinguish the various versions of the executable I would like to add my own version number or string on similar. I note that /usr/src/asterisk/main/version.c specifies a const char [] variable asterisk_version, but if I manually edit this it gets overwritten as part of the make process. Is there a sensible way I could specify some sort of identifying label (e.g. as a parameter passed to make or some such)?
In /usr/src/asterisk/build_tools/make_version_c you can specify it. This script overwrites the file you've mentioned (/usr/src/asterisk/utils/version.c).
I need to reuse value which is generated for my previous request.
For example, at first request, I make a POST to the URL /api/products/{UUID} and get HTTP response with code 201 (Created) with an empty body.
And at second request I want to get that product by request GET /api/products/{UUID}, where UUID should be from the first request.
So, the question is how to store that UUID between requests and reuse it?
You can use the Request Sent Dynamic values https://paw.cloud/extensions?extension_type=dynamic_value&q=request+send these will get the value used last time you sent a requst for a given request.
In your case you will want to combine the URLSentValue with the RegExMatch (https://paw.cloud/extensions/RegExMatch) to first get the url as it was last sent for a request and then extract the UUID from the url.
e.g
REQUEST A)
REQUEST B)
The problem is in your first requests answer. Just dont return "[...] an empty body."
If you are talking about a REST design, you will return the UUID in the first request and the client will use it in his second call: GET /api/products/{UUID}
The basic idea behind REST is, that the server doesn't store any informations about previous requests and is "stateless".
I would also adjust your first query. In general the server should generate the UUID and return it (maybe you have reasons to break that, then please excuse me). Your server has (at least sometimes) a better random generator and you can avoid conflicts. So you would usually design it like this:
CLIENT: POST /api/products/ -> Server returns: 201 {product_id: UUID(1234...)}
Client: GET /api/products/{UUID} -> Server returns: 200 {product_detail1: ..., product_detail2: ...}
If your client "loses" the informations and you want him to be later able to get his products, you would usually implement an API endpoint like this:
Client: GET /api/products/ -> Server returns: 200 [{id:UUID(1234...), title:...}, {id:UUID(5678...),, title:...}]
Given something like this, presuming the {UUID} is your replacement "variable":
It is probably so simple it escaped you. All you need to do is create a text file, say UUID.txt:
(with sample data say "12345678U910" as text in the file)
Then all you need to do is replace the {UUID} in the URL with a dynamic token for a file. Delete the {UUID} portion, then right click in the URL line where it was and select
Add Dynamic Value -> File -> File Content :
You will get a drag-n-drop reception widget:
Either press the "Choose File..." or drop the file into the receiver widget:
Don't worry that the dynamic variable token (blue thing in URL) doesn't change yet... Then click elsewhere to let the drop receiver go away and you will have exactly what you want, a variable you can use across URLs or anywhere else for that matter (header fields, form fields, body, etc):
Paw is a great tool that goes asymptotic to awesome when you explore the dynamic value capability. The most powerful yet I have found is the regular expression parsing that can parse raw reply HTML and capture anything you want for the next request... For example, if you UUID came from some user input and was ingested into the server, then returned in a html reply, you could capture that from the reply HTML and re-inject it to the URL, or any field or even add it to the cookies using the Dynamic Value capabilities of Paw.
#chickahoona's answer touches on the more normal way of doing it, with the first request posting to an endpoint without a UUID and the server returning it. With that in place then you can use the RegExpMatch extension to extract the value from the servers's response and use it in subsequent requests.
Alternately, if you must generate the UUID on the client side, then again the RegExpMatch extension can help, simply choose the create request's url for the source and provide a regexp that will strip the UUID off the end of it, such as /([^/]+)$.
A third option I'll throw out to you, put the UUID in an environment variable and just have all of your requests reference it from there.
The File Name in the Send Port should be set with the mask like ABC.txt.pgp. Since I have used the PGP Encryption Component it is generating the File name like ABC.pgp.txt.pgp. But what I need is just the ABC.txt.pgp. How can be this be done. Any help is greatly appreciated.
Thanks
What you are seeing is the expected behavior. If you are referring to this:
https://code.msdn.microsoft.com/windowsdesktop/BizTalk-Sample-PGP-ebcbc8b2
or one of it's derivatives, it will internally modify FILE.ReceivedFileName to append .pgp if that property is set.
So, if you use just %SourceFileName%, you will likely get the desired result. Otherwise, you will have to explicitly set FILE.ReceivedFileName to ABC.txt somewhere before the PGP component.
You can also modify the source code to remove this behavior.
(Same Answer)
Thanks Johns-305. I included the Message assignment shape before the send shape and used the
SendMessage(FILE.ReceivedFileName) = "ABC.txt";
In the Send Port I used Filename as "%SourceFileName%". Now I get the filename as ABC.txt.pgp in the Send Port