| Question: | ||||
|
||||
| Answer: | ||||
| ||||
January 24, 2014
PIV CAC card list of certificates
January 20, 2014
The novel way to build cross compiler tools
http://www.cis.upenn.edu/~milom/cross-compile.html
The reason it is novel is because it takes the target header file and library directly without recompiling them. Therefore this approach is much simpler than the regular from scratch method.
To make it easier for my CIS534 students to compile code for our one and
only SPARC machine (a 128-thread Niagara T2 box, generously donated by
Sun Microsystems), I created a cross-compiler for GCC on x86/Linux to
SPARC/Solaris. This page documents how I did it. I'm putting it
on-line in case anyone else finds it helpful.
Update (April 2010): If you're getting dynamic linking errors, particularly with C++, you may need to use the "-R" option when compiling. This option specifies a path the dynamic loader on the target to look for the libraries:
The reason it is novel is because it takes the target header file and library directly without recompiling them. Therefore this approach is much simpler than the regular from scratch method.
How to Cross-Compile GCC for SPARC Solaris
Computer and Information Sciences Department
University of Pennsylvania
January 2010
Overview
There are three steps to building the cross compiler:- Specifying the configuration and paths
- Finding and installing the proper system header files and libraries
- Cross-compiling GNU binutils and GCC
Definitions and Configuration
- The "host" is the machine on which the compiler executes (x86/Linux in my case). By default, the configure scripts will automatically figure this out.
- The "target" is the machine on which the output binaries will execute (for SPARC/Solaris in my case, it should be sparc-sun-solaris2.10). This needs to be set explicitly. You can find out the proper target string by executing gcc -dumpmachine.
- The "prefix" is the instalation prefix where the cross-compiler will be installed.
- The "sysroot" is the location the cross compiler will look for header files and libraries. The sysroot directory acts as if it is the root of the system,. So, for example, header files go in $SYSROOT/usr/include/ and library files go in $SYSROOT/usr/lib/, etc.
setenv TARGET sparc-sun-solaris2.10 setenv PREFIX /mnt/castor/seas_home/c/cis534/public/cross/ setenv SYSROOT $PREFIX/sysroot/ set path = ( $path $PREFIX/bin ) mkdir $PREFIX mkdir $SYSROOT
System Headers and Libraries
To be able to build and link applications, the cross-compiler needs access to the system header files. As building the compiler also uses some of these files, installing these files needs to be done first. If you have access to the target machine, you can just copy the files into $SYSROOT. Otherwise, you'll need to download the files from the proper distribution. To copy the files, I piped tar through SSH to the SPARC machine (arachnid, in our case), as I could not find an option to get SCP to preserve symbolic links:cd $SYSROOT ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/include" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/local/include" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /lib" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/lib" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/local/lib" | tar -xvf -Copying the above directories worked for what I needed to do, but you might also considering copying additional headers and libraries:
ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/openwin/include" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/dt/include" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/X11/include" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/openwin/lib" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/dt/lib" | tar -xvf - ssh milom@arachnid.seas.upenn.edu "tar -cf - /usr/X11/lib" | tar -xvf -
Cross-compiling GNU binutils and GCC
Building binutils and GCC is reasonable straightforward (if everything works), by downloading, unpacking, configuring, running make, and then make install for both:mkdir /scratch/users/build cd /scratch/users/build wget http://ftp.gnu.org/gnu/binutils/binutils-2.20.tar.gz tar -xvzf binutils-2.20.tar.gz mkdir build-binutils cd build-binutils/ ../binutils-2.20/configure -target=$TARGET --prefix=$PREFIX -with-sysroot=$SYSROOT -v make all; make install wget http://ftp.gnu.org/gnu/gcc/gcc-4.4.2/gcc-4.4.2.tar.gz tar -xvzf gcc-4.4.2.tar.gz mkdir build-gcc cd build-gcc ../gcc-4.4.2/configure --target=$TARGET --with-gnu-as --with-gnu-ld --prefix=$PREFIX -with-sysroot=$SYSROOT --disable-libgcj --enable-languages=c,c++ -v make all; make installYou can delete the build directories once the make install has been completed. Also, the above config for GCC will only build C and C++, but you can remove that option if you need to build GCC with support for other languages.
Testing
This will create two sets of binaries. The directory $PREFIX/bin/ will include executables of the form: sparc-sun-solaris2.10-gcc. You should be able to use this to compile a program:$PREFIX/bin/sparc-sun-solaris2.10-gcc hello.c -o helloRunning file hello should return something like:
ELF 32-bit MSB executable, SPARC32PLUS, V8+ Required, version 1 (SYSV), dynamically linked (uses shared libs), not strippedThen copy hello over to the SPARC box, and see if it runs. Although it shouldn't be necessary, if it gives dynamic linking errors, you could try setting the LD_LOAD_LIBRARY environment variable.
Update (April 2010): If you're getting dynamic linking errors, particularly with C++, you may need to use the "-R" option when compiling. This option specifies a path the dynamic loader on the target to look for the libraries:
$PREFIX/bin/sparc-sun-solaris2.10-gcc -R $PREFIX/$TARGET/lib/sparcv9/ hello.c -o helloThis assumes the -R path is mounted on the target machine. If not, you may need to copy over those files and adjust the -R path accordingly.
Acknowledgments
Thanks to the authors of the following web pages I found useful when figuring this out were:January 16, 2014
serial port to tcp redirection and terminal emulation
Usually, when you connect to a serial port, on Windows, you would use Tera Term, or Putty, (or secureCRT, etc), and on Linux you would use picocom, minicom, etc. All these program do at least two things:
1. connect to a serial device
2. emulate a terminal (VT100, etc)
Now if you want to remotely access that serial port, and you can use a program to convert the serial data stream to TCP data stream (ser2net/remserial on Linux, com2tcp on Windows). The only thing is that you still need a "terminal emulator" to get full capability (vi, etc) from that console.
One way to do it to use "putty", and use "raw tcp" and make sure you set "local echo" to "off", and "local line editing" to off on the "Terminal" tab of the Settings.
1. connect to a serial device
2. emulate a terminal (VT100, etc)
Now if you want to remotely access that serial port, and you can use a program to convert the serial data stream to TCP data stream (ser2net/remserial on Linux, com2tcp on Windows). The only thing is that you still need a "terminal emulator" to get full capability (vi, etc) from that console.
One way to do it to use "putty", and use "raw tcp" and make sure you set "local echo" to "off", and "local line editing" to off on the "Terminal" tab of the Settings.
Another way is to run a local tcp-to-com kind of program. On linux, you can use remserial to create a virtual com port, and on Windows I think you can use com2tcp/com0com to do it. But I think using putty to access it directly is easier.
com2tcp tips
com2tcp can be used on Windows to redirect UART port to TCP port. Here is an example command to do that:
com2tcp --baud 9600 --ignore-dsr \\.\com1 8888
Note that "--ignore-dsr" is needed most of the times, otherwise com2tcp may close tcp ports when it detects DSR off.
com2tcp --baud 9600 --ignore-dsr \\.\com1 8888
Note that "--ignore-dsr" is needed most of the times, otherwise com2tcp may close tcp ports when it detects DSR off.
January 15, 2014
kermit file transfer and u-boot
I usually use "picocom" on Linux to talk through a serial line to U-boot. Of course I have used "minicom" before but it seems heavy. There is even "microcom". However, so far I have stayed away from "kermit" just because it seems to be so complicated and not totally free in license.
Now the authors in Columbia University has made it totally free (BSD license), and U-boot supports its file transfer protocol (loadb command) (u-boot does not support ZModem, only Ymodem). I take a look at it.
It looks like a nice serial terminal emulator with file transfer capability. The macro part is really handy. Below is my .kermrc file with two user-defined macros for uploading uboot and kernel images using the kermit protocol in a different baud rate than console baud
Now the authors in Columbia University has made it totally free (BSD license), and U-boot supports its file transfer protocol (loadb command) (u-boot does not support ZModem, only Ymodem). I take a look at it.
It looks like a nice serial terminal emulator with file transfer capability. The macro part is really handy. Below is my .kermrc file with two user-defined macros for uploading uboot and kernel images using the kermit protocol in a different baud rate than console baud
cat ~/.kermrc
set line /dev/ttyUSB1
set speed 115200
set carrier-watch off
set handshake none
set flow-control none
robust
set file type bin
set file name lit
set rec pack 1000
set send pack 1000
set window 5
set delay 1
connect
define sendb {
set speed 230400
output \x0D
output \x0D
send u-boot.bin
input 1 "NEVER"
set speed 115200
output \x1B
output \x0D
}
define sendk {
set speed 230400
output \x0D
output \x0D
send uImage
input 1 "NEVER"
set speed 115200
output \x1B
output \x0D
}
January 10, 2014
Qt, embedded Linux, Keyboard map
If you happen to use Qt for your embedded Linux project, and need keyboard support. The following things may be useful.
1. Qt supports keyboard keymap since version 4.6. By default it uses the default keymap, which has a bug (unfixed as of early 2014) that prevents CAPS LOCK and num lock to work. See details here: https://bugreports.qt-project.org/browse/QTBUG-9843 . You can either patch it using the patch file on that bug report , or use an external keymap file.
2. To use an external keymap file, you need to obtain the Linux keymap file package (http://lct.sourceforge.net/data.html click on "Download" on the left), untar it, get "keymaps/i386/qwerty/us-latin1.kmap". This file is for the default US keyboard. Use the keymap that matches your keyboard.
3. Qt includes a tool named "kmap2qmap" to convert the above kmap file to a qmap file that Qt applications can uses. You may want to patch the "kmap2qmap" source code to prevent this bug. It's a simple patch. Then run it as "kmap2qmap us-latin1.kmap us.qmap", and you should get the new file "us.qmap". It is safe to ignore the warnings.
4. Put this qmap file in your system, let's assume "/opt/us.qmap", and set the following env variable:
export QWS_KEYBOARD="<driver>:keymap=/opt/us.qmap". I use a qt keyboard driver plugin in my setup so I don't use the variable, but this is supposed to be how your run it. More details here.
That's it. Now your new keyboard should work. :-) I know, finally!
P.S. this website (and this one) provides good information on keyboard scan code (Set 1, Set 2, Set 3, USB HID, etc)
1. Qt supports keyboard keymap since version 4.6. By default it uses the default keymap, which has a bug (unfixed as of early 2014) that prevents CAPS LOCK and num lock to work. See details here: https://bugreports.qt-project.org/browse/QTBUG-9843 . You can either patch it using the patch file on that bug report , or use an external keymap file.
2. To use an external keymap file, you need to obtain the Linux keymap file package (http://lct.sourceforge.net/data.html click on "Download" on the left), untar it, get "keymaps/i386/qwerty/us-latin1.kmap". This file is for the default US keyboard. Use the keymap that matches your keyboard.
3. Qt includes a tool named "kmap2qmap" to convert the above kmap file to a qmap file that Qt applications can uses. You may want to patch the "kmap2qmap" source code to prevent this bug. It's a simple patch. Then run it as "kmap2qmap us-latin1.kmap us.qmap", and you should get the new file "us.qmap". It is safe to ignore the warnings.
4. Put this qmap file in your system, let's assume "/opt/us.qmap", and set the following env variable:
export QWS_KEYBOARD="<driver>:keymap=/opt/us.qmap". I use a qt keyboard driver plugin in my setup so I don't use the variable, but this is supposed to be how your run it. More details here.
That's it. Now your new keyboard should work. :-) I know, finally!
P.S. this website (and this one) provides good information on keyboard scan code (Set 1, Set 2, Set 3, USB HID, etc)
msed - multiple search and replace on a file from command line
msed is a simple command-line program that search and replace multiple words in a file. You put the words to be searched and replaced in the "Pattern" file, and the run msed with "msed Pattern-file Target-file".
msed does word boundary replacement. Therefore, when you ask it to replace "kit" to "kat", it will respect and not replace "kitty" or "kit0".
msed will output to standard output. You can redirect it to a file.
The code:
msed does word boundary replacement. Therefore, when you ask it to replace "kit" to "kat", it will respect and not replace "kitty" or "kit0".
msed will output to standard output. You can redirect it to a file.
The code:
#!/usr/bin/php
# Perform multiple search and replace on the target file
function usage(){
echo "\n" .
"Usage: msed [-r]\n" .
"pattern-file contains lines of Search and Replace, example\n" .
" Pig Dog\n" .
" Cat Kitty\n" .
"-r: reversed pattern file, ie. Replace is first, Search is second\n";
}
if (count($argv)!=3 && count($argv)!=4){
usage();
exit(-1);
}
$pfile=$argv[1];
$tfile=$argv[2];
$reverse=false;
if (count($argv)==4){
$reverse=true;
fprintf(STDERR,"reversed serach and replace patterns\n");
}
## check files
$pat_str=file_get_contents($pfile);
if ($pat_str===FALSE){
die("Error opening pattern file $pfile\n");
}
$t_str=file_get_contents($tfile);
if ($t_str===FALSE){
die("Error opening target file $tfile\n");
}
$pat_arr=explode("\n",$pat_str);
if (count($pat_arr)<1){
die("Error, no pattern found in file.\n");
}
## read patterns and sort by length
$pat=array("s"=>array(),"r"=>array());
foreach($pat_arr as $pline){
$pline=trim($pline);
if (strlen($pline)<1) continue;
$parts=preg_split('/\s+/',$pline);
if (count($parts)!=2){
fprintf(STDERR,"skipping invalid pattern line:$pline\n");
continue;
}
if ($reverse){
$pat["s"][]="/\b$parts[1]\b/";
$pat["r"][]=$parts[0];
}else{
$pat["s"][]="/\b$parts[0]\b/";
$pat["r"][]=$parts[1];
}
}
## do search and replacement
$t_str=preg_replace($pat["s"],$pat["r"],$t_str);
echo($t_str);
January 9, 2014
Linux USB and USB keyboard driver debugging tips
1. USBMON is your friend. It has very little dependency and is very useful in giving you low level USB packets. The short but complete and helpful documentation is at: https://www.kernel.org/doc/Documentation/usb/usbmon.txt
2. The USB Made Simple website with details of how USB works. The articles are fairly short so you can read and understand how USB works. Very useful. Site: http://www.usbmadesimple.co.uk/ums_3.htm
3. Linux Device Driver boot (Rev 3) has a good chapter about USB Urbs and the architecture of the USB stack on Linux, giving you a good overall picture of how things work. Site: http://www.makelinux.net/ldd3/chp-13-sect-3
4. Linux Documentation input.txt provides very useful information on Linux handling of USB HID and events. Address: https://www.kernel.org/doc/Documentation/input/input.txt
5. freedesktop.org publishes a tool called 'evtest' that can read events to Linux device /dev/eventX. This can be really useful in viewing raw events. The package has only one C file and no lib dependency. So very easy to compile for your target. Site: http://cgit.freedesktop.org/evtest/
6. TI's Wiki has a good overview of how TI's USB stack fits into the Linux USB stack. Site: http://processors.wiki.ti.com/index.php/DM81xx_AM38XX_USB_User_Guide#Linux_USB_Stack_Architecture
2. The USB Made Simple website with details of how USB works. The articles are fairly short so you can read and understand how USB works. Very useful. Site: http://www.usbmadesimple.co.uk/ums_3.htm
3. Linux Device Driver boot (Rev 3) has a good chapter about USB Urbs and the architecture of the USB stack on Linux, giving you a good overall picture of how things work. Site: http://www.makelinux.net/ldd3/chp-13-sect-3
4. Linux Documentation input.txt provides very useful information on Linux handling of USB HID and events. Address: https://www.kernel.org/doc/Documentation/input/input.txt
5. freedesktop.org publishes a tool called 'evtest' that can read events to Linux device /dev/eventX. This can be really useful in viewing raw events. The package has only one C file and no lib dependency. So very easy to compile for your target. Site: http://cgit.freedesktop.org/evtest/
6. TI's Wiki has a good overview of how TI's USB stack fits into the Linux USB stack. Site: http://processors.wiki.ti.com/index.php/DM81xx_AM38XX_USB_User_Guide#Linux_USB_Stack_Architecture
January 2, 2014
RJ11 telephone cables
Technical term:
RJ11, RJ14, and RJ25 all use the same physical connector.
RJ11 has two wires.
RJ14 has 4 wires.
RJ25 has 6 wires.
If you want to buy RJ25 connector/cable, search for the term "6p6c" such as on amazon.com
Another theory:
RJ11 has 4 wires: 6p4c
RJ12 has 6 wires: 6p6c
RJ11, RJ14, and RJ25 all use the same physical connector.
RJ11 has two wires.
RJ14 has 4 wires.
RJ25 has 6 wires.
If you want to buy RJ25 connector/cable, search for the term "6p6c" such as on amazon.com
Another theory:
RJ11 has 4 wires: 6p4c
RJ12 has 6 wires: 6p6c
December 18, 2013
The best grep replacement: ag
http://geoff.greer.fm/2011/12/27/the-silver-searcher-better-than-ack/
It's syntax is pretty much the same as ack, but written in optimized C and is noticeably faster.
It's syntax is pretty much the same as ack, but written in optimized C and is noticeably faster.
December 6, 2013
The Telnet Protocol
The Telnet protocol is often thought
of as simply providing a facility for remote logins
to computer via the Internet. This was its original
purpose although it can be used for many other purposes.
It is best understood in the context of a user with
a simple terminal using the local telnet program (known
as the client program) to run a login session on a
remote computer where his communications needs are
handled by a telnet server program. It should be emphasised
that the telnet server can pass on the data it has
received from the client to many other types of process
including a remote login server. It is described in
RFC854 and was first published in 1983.
The Network Virtual TerminalCommunication is established using the TCP/IP protocols and communication is based on a set of facilities known as a Network Virtual Terminal (NVT). At the user or client end the telnet client program is responsible for mapping incoming NVT codes to the actual codes needed to operate the user's display device and is also responsible for mapping user generated keyboard sequences into NVT sequences.The NVT uses 7 bit codes for characters, the display device, referred to as a printer in the RFC, is only required to display the "standard" printing ASCII characters represented by 7 bit codes and to recognise and process certain control codes. The 7 bit characters are transmitted as 8 bit bytes with most significant bit set to zero. An end-of-line is transmitted as the character sequence CR (carriage return) followed by LF (line feed). If it is desired to transmit an actual carriage return this is transmitted as a carriage return followed by a NUL (all bits zero) character. NVT ASCII is used by many other Internet protocols. The following control codes are required to be understood by the Network Virtual Terminal.
CommandsThe telnet protocol also specifies various commands that control the method and various details of the interaction between the client and server. These commands are incorporated within the data stream. The commands are distinguished by the use of various characters with the most significant bit set. Commands are always introduced by a character with the decimal code 255 known as an Interpret as command (IAC) character. The complete set of special characters is
Common Telnet options:
Options are agreed by a process of negotiation which results in the client and server having a common view of various extra capabilities that affect the interchange and the operation of applications. Either end of a telnet dialogue can enable or disable an option either locally or remotely. The initiator sends a 3 byte command of the form IAC,<type of operation>,<option>The response is of the same form. Operation is one of
255(IAC),251(WILL),3 The final byte of the three byte sequence identifies the required action. For some of the negotiable options values need to be communicated once support of the option has been agreed. This is done using sub-option negotiation. Values are communicated via an exchange of value query commands and responses in the following form. IAC,SB,<option code number>,1,IAC,SEand IAC,SB,<option code>,0,<value>,IAC,SEFor example if the client wishes to identify the terminal type to the server the following exchange might take place Client 255(IAC),251(WILL),24 Server 255(IAC),253(DO),24 Server 255(IAC),250(SB),24,1,255(IAC),240(SE) Client 255(IAC),250(SB),24,0,'V','T','2','2','0',255(IAC),240(SE)The first exchange establishes that terminal type (option number 24) will be handled, the server then enquires of the client what value it wishes to associate with the terminal type. The sequence SB,24,1 implies sub-option negotiation for option type 24, value required (1). The IAC,SE sequence indicates the end of this request. The repsonse IAC,SB,24,0,'V'... implies sub-option negotiation for option type 24, value supplied (0), the IAC,SE sequence indicates the end of the response (and the supplied value). The encoding of the value is specific to the option but a sequence of characters, as shown above, is common.
|
November 22, 2013
Adding Linux PAM
If you have an embedded Linux, but want to add Linux PAM to your system, here are some of the thing I have found out:
What you will need:
1. Linux-PAM package
2. Shadow package (Debian or Linux From Scratch has source)
3. cracklib package (sourceforge)
Linux-pam needs cracklib to test password complexity.
1. compile and install cracklib
CC=ppc-linux-gcc ./configure --host=ppc-linux
make
make install DESTDIR=/home/me/install
2. compile and install linux-pam
LIBS="-lcrack" CFLAGS=-I/home/me/install/usr/local/include LDFLAGS=-L/home/me/install/usr/local/lib/ CC=ppc-linux-gcc ./configure --host=ppc-linux --disable-nis --disable-selinux --disable-regenerate-docu --disable-nls --disable-rpath
What you will need:
1. Linux-PAM package
2. Shadow package (Debian or Linux From Scratch has source)
3. cracklib package (sourceforge)
Linux-pam needs cracklib to test password complexity.
1. compile and install cracklib
CC=ppc-linux-gcc ./configure --host=ppc-linux
make
make install DESTDIR=/home/me/install
2. compile and install linux-pam
LIBS="-lcrack" CFLAGS=-I/home/me/install/usr/local/include LDFLAGS=-L/home/me/install/usr/local/lib/ CC=ppc-linux-gcc ./configure --host=ppc-linux --disable-nis --disable-selinux --disable-regenerate-docu --disable-nls --disable-rpath
make install DESTDIR=/home/me/install
(you may want to change the installed *.la files to point to the right directory. this is bug of libtools)
3. compile shadow
LIBS="-lpam -lpamc" CFLAGS=-I/home/tzhang/install/usr/include LDFLAGS=-L/home/tzhang/install/lib64/ CC=ppc-linux-gcc ./configure --host=ppc-linux --with-libpam --without-selinux --without-sha-crypt --without-nscd --disable-shadowgrp
make
you will need to transfer the following files to your target (as you go along, you may need more modules):
/lib64/
/lib64/security
/lib64/security/pam_unix.so
/lib64/security/pam_cracklib.so
/lib64/libcrack.so.2
and then:
useradd
passwd
login
create the following files under /etc/pam.d/
/etc/pam.d/system-auth
/etc/pam.d/passwd
/etc/pam.d/other
also login.defs:
-bash-3.00# cat /etc/login.defs
ENV_SUPATH PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
ENV_PATH PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
MAIL_DIR /var/mail
and this one:
-bash-3.00# cat /etc/default/useradd
SHELL=/bin/sh
make sure you have at least an empty shadow file
$ touch /etc/shadow
PAM is used when adding user, changing password, login, etc. You can also hook your application to PAM authentication.
November 21, 2013
TI Sitara DM816x UART BOOT
On silicon revision 1.0 and 1.1, the BOOTROM operates at baud rate 32452.
On silicon revision >=2.0, the baud rate is 64904 baud
On silicon revision >=2.0, the baud rate is 64904 baud
November 20, 2013
busybox password hash algorithm
Busybox has a command "passwd" and take an argument "-a ALG", but it does not tell you which "ALG" should be. Well, here it is:
1. "des"
2. "md5"
3. "sha256"
4. "sha512"
1. "des"
2. "md5"
3. "sha256"
4. "sha512"
How to add jquery to any webpage without using a browser plugin
Option 1
Copy the following code to your browser's javascript console (under developer tools) and run it:
Option 2
Go to: http://code.jquery.com/jquery-latest.min.js and copy the entire code to run in your javascript console.
To check, run the following in your javascript console:
And you should get 1.
Copy the following code to your browser's javascript console (under developer tools) and run it:
var body = document.getElementsByTagName("body")[0];
var script = document.createElement('script');
script.type = "text/javascript";
script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js";
body.appendChild(script);
Option 2
Go to: http://code.jquery.com/jquery-latest.min.js and copy the entire code to run in your javascript console.
To check, run the following in your javascript console:
$("body").length
And you should get 1.
November 18, 2013
C code to detect link connected/disconnected using RTNETLINK
RTNETLINK documentation is not very good. Here is an example of how to detect interface disconnected/disconnected using it. If you want to detect interface up and down, just check the flag IFF_UP instead of IFF_RUNNING.
https://gist.github.com/tiebingzhang/aafc2953b430d5586bd1135cad85100f
https://gist.github.com/tiebingzhang/aafc2953b430d5586bd1135cad85100f
November 8, 2013
How to compile Net-SNMP 5.7.2 for Windows on Linux using MinGW
Here is how to compile Net-SNMP 5.7.2 for Windows on Linux using MinGW.
In my setup, the host is Fedora Linux 19 64-bit.
1. Install MinGW:
3. configure it:
1. Comment out RANLIB in all Makefiles
3. Manually do ranlib
P.S.
I tried to directly set RANLIB in Makefile to be i686-w64-mingw32-ranlib, but then it tries to ranlib the *.la files and fail. If you know a way to directly set RANLIB in Makefiles and compile successfully, please let me know by leaving a comment below.
Option 2
1. Point ranlib to mingw ranlib in all Makefiles
This time it should make all the way to the end. That's it.
In my setup, the host is Fedora Linux 19 64-bit.
1. Install MinGW:
sudo yum install mingw32-binutils mingw32-cpp mingw32-filesystem mingw32-gcc mingw32-gcc-c++ mingw32-runtime mingw32-w32api2. Get snmp-5.7.2 source code and untar it
3. configure it:
CC=i686-w64-mingw32-gcc ./configure --host=mingw32 --with-ar=i686-w64-mingw32-ar \ --without-perl-modules --disable-embedded-perl \ --disable-mib-loading --with-openssl=internal --enable-mini-agent --with-out-transports="Callback Unix TCP" \ --disable-manuals --disable-sharedOption 1
1. Comment out RANLIB in all Makefiles
find . -name Makefile | xargs sed -i 's/^RANLIB.*/RANLIB=echo'2.
make -j 20
3. Manually do ranlib
find . -name "*.a" | xargs i686-w64-mingw32-ranlib4.
make -j 208. More manual ranlib
find . -name "*.a" | xargs i686-w64-mingw32-ranlib5. continue to make
make -j 20This time it should make all the way to the end. That's it.
P.S.
I tried to directly set RANLIB in Makefile to be i686-w64-mingw32-ranlib, but then it tries to ranlib the *.la files and fail. If you know a way to directly set RANLIB in Makefiles and compile successfully, please let me know by leaving a comment below.
Option 2
1. Point ranlib to mingw ranlib in all Makefiles
mkdir -p $HOME/bin; cd $HOME/bin; cat <<EOF >2.myranlib #!/bin/sh echo Running 686-ranlib $* i686-w64-mingw32-ranlib $* exit 0; EOF chmod +x myranlib ln -sf ranlib myranlib find . -name Makefile | xargs sed -i '1s/^/PATH := $(HOME)\/bin:$(PATH)\n/'
make -j 20
This time it should make all the way to the end. That's it.
November 7, 2013
Tshark decode and dump packets
Suppose you have the captured file, just use the following command to dump the first frame:
-V: decode and print packet details
-x: print packet payload in Hex
-Y frame.number==1: only decode the first frame
tshark -r ~/hcm_stigs/snmp.pcapng -Y frame.number==1 -Vx
-V: decode and print packet details
-x: print packet payload in Hex
-Y frame.number==1: only decode the first frame
November 5, 2013
SNMP V3 password to key algorithm implementation in GoLang
package main
import (
"fmt"
"io"
"crypto/md5"
"crypto/sha1"
)
func password_to_key( password string, engineID string, hash_alg string) {
h := sha1.New()
if hash_alg=="MD5" {
h = md5.New()
}
count := 0;
plen:=len(password);
repeat := 1048576/plen;
remain := 1048576%plen;
for count < repeat {
io.WriteString(h,password);
count++;
}
if remain > 0 {
io.WriteString(h,string(password[:remain]));
}
ku := string(h.Sum(nil))
fmt.Printf("ku=% x\n", ku)
h.Reset();
io.WriteString(h,ku);
io.WriteString(h,engineID);
io.WriteString(h,ku);
localKey:=h.Sum(nil);
fmt.Printf("localKey=% x\n", localKey)
return;
}
func main(){
password_to_key("maplesyrup","\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02","MD5");
password_to_key("maplesyrup","\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02","SHA1");
}
November 1, 2013
Conference Call Systems
GoToMeeting and Webex are mainstream ones. I used GoToMeeting and like it.
Others:
- FreeConference
- FreeConferenceCallHD
More others:
So for those out there who may not know that alternatives exist, here are six options to use instead of GoToMeeting and WebEx:
Others:
- FreeConference
- FreeConferenceCallHD
More others:
So for those out there who may not know that alternatives exist, here are six options to use instead of GoToMeeting and WebEx:
1. AnyMeeting
AnyMeeting has been one of the quieter players in the web conferencing sector, but it’s solid service that has been pushing forward on the innovation front. Just two weeks ago, it announced that it had added WebRTC technology to its product so you don’t have to use Adobe Flash on some browsers. It has more than 400,000 users across its free and paid offerings.2. FuzeBox
FuzeBox offers HD video and audio conferencing across quite a few platforms, including PC, Mac, iPhone, iPad, and Android phones and tablets. While you still have to download the apps, the software is cleaner and more intuitive than WebEx and GoToMeeting — so much so that FuzeBox counts big names like Amazon, eBay, Disney, NASA, Evernote, Verizon Wireless, and Spotify as customers.3. Google Hangouts
Yes, Google Hangouts doesn’t exactly scream business. But so what? Hangouts offers the capability to chat with up to 10 people on a video call for free. You may also collaborate on Drive documents while you talk on a Hangout. This is an especially attractive offer for all the small businesses out there that don’t want to pay for more software and for enterprises that already use Google Apps.4. Join.me
LogMeIn’s Join.me service is one of the strongest up-and-comers in the web-conferencing field. In my own tests, it works much faster than WebEx and GoToMeeting, but in most cases you do have to download the app once to start a meeting. If you are a participant on a call, however, you can join a meeting without a download — all the call organizer has to do is send you a link.5. MeetingBurner
We talked with MeetingBurner last year and haven’t heard too much from the company since, but I recently spoke with CEO John Rydell, and he assures me his startup is very much alive and kicking. MeetingBurner uses the power of the cloud to make sure participants can hop on a call or webinar quickly without downloading software. You can host conference calls for up to 10 people for free without showing you ads, and if you need to conduct calls with even more attendees, it undercuts WebEx and GoToMeeting’s prices.6. Zoom
Zoom was founded in 2011 by folks from Cisco and WebEx who wanted to make a better video conferencing product. It offers HD video or voice conferences for up to 25 people, and it supports meetings on the web, Mac, Windows, iOS, and Android. It also includes a few extra nifty features that aren’t found on many competitors, including screen sharing from iPhone and iPad, a private cloud deployment option, and sharing a computer’s audio feed during screen sharing.
Subscribe to:
Posts (Atom)