FAI Installation Steps Network boot via PXE Run scripts to determine FAI classes and variables Partition local hard disks and create RAID, LVM configuration and the file systems Install and configure software packages Customize OS and software to your local needs Reboot freshly installed machine http://www.informatik.uni-koeln.de/fai/features/
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tcp tuning tcp_syncookies
tcp_syncookies. Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common “syn flood attack”. Disabled (0) by default. :–:cat /proc/sys/net/ipv4/tcp_syncookies 0 :–: added from linux kernel source. /* 160 * Generate a syncookie. mssp points to the mss, which is returned 161 * rounded down to …
generating random passwords.
makepass.py from random import choice import string def GenPasswd(length=8, chars=string.letters+string.digits): return ”.join([ choice(chars) for i in range(length) ]) ahiliation:~$python Python 2.5.5 (r255:77872, Mar 20 2010, 05:19:32) [GCC 4.4.3] on linux2 Type “help”, “copyright”, “credits” or “license” for more information. >>> import makepass >>> for i in range(6): … print makepass.GenPasswd(12) … BSxqLK9mpq4R FRlppP7K2Che YBkz0QZMJojC JjTQlcHzDsC3 …
fopen64 programming
fopen64(“/home/jeffrin/.netrc”, “r”) = 0 The fopen64() function is identical to the fopen() function except that the underlying file descriptor is created with the O_LARGEFILE flag set. The fopen64() function is a part of the large-file extensions. http://coding.derkeiler.com/Archive/C_CPP/comp.lang.c/2008-07/msg00256.html
getservbyname programming
The getservbyname() function returns a servent structure for the entry from the database that matches the service name using protocol proto. If proto is NULL, any protocol will be matched. A connection is opened to the database if necessary. getservbyname(“ftp”, “tcp”) = 0x7fcc5248b8c0 The servent structure is defined in as follows: struct servent { char …
wcwidth – determine columns needed for a wide character
UNIX API wcwidth – determine columns needed for a wide character API Explanation Code #define _XOPEN_SOURCE #include <wchar.h> #include<stdio.h> main() { int value; wchar_t cr; cr=’H’; value=wcwidth(cr); printf(“n %d n”,value); } http://gcc.gnu.org/ml/gcc-bugs/2000-10/msg00540.html
tic compiler
tic – the terminfo entry-description compiler The command tic translates a terminfo file from source format into compiled format. The compiled format is necessary for use with the library routines in ncurses(3NCURSES). http://tldp.org/HOWTO/Text-Terminal-HOWTO.html
__errno_location binary standard
__errno_location() = 0x7f631c659698 __errno_location — address of errno variable snapshot from the binary file /bin/ls ^@strstr^@__errno_location^@mempcpy^@_setjmp^ http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/baselib-errno-location-1.html
__fpending programming
The __fpending() function returns the number of bytes in the output buffer. For wide-oriented streams the unit is wide characters. This function is undefined on buffers in reading mode, or opened read-only. On POSIX-compliant platforms, SIGSEGV is the signal sent to a process when it makes an invalid memory reference, or segmentation fault. #include<stdio.h> #include<stdio_ext.h> …
BCM4311 802.11b/g WLAN
-[0000:00]-+-1c.1-[04]—-00.0 Broadcom Corporation BCM4311 802.11b/g WLAN command : lspci -n 00:1c.1 0604: 8086:2841 (rev 03) http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/