Programming Forums > Application Development > C++

Da-Kid · Nov 27th, 2004, 2:09 AM

Hi, There is a program out called Tripwire for linux users. It checks for File permissions and if its been edited etc.. I wanted to know if anyone has anyidea on make a simple program to replicate Tripwire...by making a pop up window that shows when a user logs in/out and when a file is edited

Eggbert · Nov 27th, 2004, 8:04 AM

Checking file accesses and permissions is trivial:

(Toggle Plain Text)

#include <sys/stat.h>

time_t last = 0; /* Set to the previous modification */

int was_modified ( const char *path )
{
 struct stat buf;

 if ( stat ( path, &buf ) != -1 ) {
  if ( last == 0 ) {
   last = buf.st_mtime;
   return 1;
  }
  else if ( last != buf.st_mtime )
   return 1;
 }

 return 0;
}

int is_writable ( const char *path )
{
 struct stat buf;

 if ( stat ( path, &buf ) != -1 )
  return ( buf.st_mode & ( S_IWUSR | S_IWGRP ) ) != 0;

 return 0;
}

A window is probably a bad idea because it assumes the user is running in a windowed environment. There are many users who still prefer the command terminal. Since this program will be run as a background process anyway, it would be preferrable to write it as a command line program, then start it in whatever login script you use. If you really want to pop up a window then spawning a terminal window with information on which file was tripped would probably be easier (and more portable across distributions) than using a windowing API.

Da-Kid · Nov 27th, 2004, 6:36 PM

I understand, would it be easier if another terminal window opened..Thanks for your reply

Eggbert · Nov 27th, 2004, 6:44 PM

>would it be easier if another terminal window opened..
Is this a question or just poor word ordering? Yes, it would be easier because you wouldn't get bogged down in the details of creating and manipulating a window. You can simply use an existing program like xterm to do all of that for you, so that the end result is you simply write text to the standard output and everything will "just work".

Ade · Nov 28th, 2004, 6:33 AM

I think Eggbert is Dennis Ritchie in disguise!

Infinite Recursion · Nov 28th, 2004, 1:06 PM

Eggbert is the resident wizard! Btw, Stewey kicks ass

kurifu · Nov 28th, 2004, 4:26 PM

Resident Wizard? lol

And as a follow-up, yes Stewie does kick ass

Nov 27th, 2004, 8:04 AM	#2
Eggbert Professional Programmer Join Date: Nov 2004 Posts: 250 Rep Power: 5	Checking file accesses and permissions is trivial: (Toggle Plain Text) #include <sys/stat.h> time_t last = 0; /* Set to the previous modification / int was_modified ( const char path ) { struct stat buf; if ( stat ( path, &buf ) != -1 ) { if ( last == 0 ) { last = buf.st_mtime; return 1; } else if ( last != buf.st_mtime ) return 1; } return 0; } int is_writable ( const char path ) { struct stat buf; if ( stat ( path, &buf ) != -1 ) return ( buf.st_mode & ( S_IWUSR \| S_IWGRP ) ) != 0; return 0; } #include <sys/stat.h> time_t last = 0; / Set to the previous modification / int was_modified ( const char path ) { struct stat buf; if ( stat ( path, &buf ) != -1 ) { if ( last == 0 ) { last = buf.st_mtime; return 1; } else if ( last != buf.st_mtime ) return 1; } return 0; } int is_writable ( const char *path ) { struct stat buf; if ( stat ( path, &buf ) != -1 ) return ( buf.st_mode & ( S_IWUSR \| S_IWGRP ) ) != 0; return 0; } A window is probably a bad idea because it assumes the user is running in a windowed environment. There are many users who still prefer the command terminal. Since this program will be run as a background process anyway, it would be preferrable to write it as a command line program, then start it in whatever login script you use. If you really want to pop up a window then spawning a terminal window with information on which file was tripped would probably be easier (and more portable across distributions) than using a windowing API.

Nov 28th, 2004, 6:33 AM	#5
Ade Hobbyist Programmer Join Date: Oct 2004 Location: England, UK Posts: 139 Rep Power: 0	I think Eggbert is Dennis Ritchie in disguise! __________________ Don't wound what you can't kill

Nov 28th, 2004, 1:06 PM	#6
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,467 Rep Power: 8	Eggbert is the resident wizard! Btw, Stewey kicks ass __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Nov 28th, 2004, 4:26 PM	#7
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Resident Wizard? lol And as a follow-up, yes Stewie does kick ass __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

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Nov 27th, 2004, 2:09 AM	#1
Da-Kid Programmer Join Date: Nov 2004 Posts: 47 Rep Power: 0	Hi, There is a program out called Tripwire for linux users. It checks for File permissions and if its been edited etc.. I wanted to know if anyone has anyidea on make a simple program to replicate Tripwire...by making a pop up window that shows when a user logs in/out and when a file is edited

Nov 27th, 2004, 6:36 PM	#3
Da-Kid Programmer Join Date: Nov 2004 Posts: 47 Rep Power: 0	I understand, would it be easier if another terminal window opened..Thanks for your reply

Nov 27th, 2004, 6:44 PM	#4
Eggbert Professional Programmer Join Date: Nov 2004 Posts: 250 Rep Power: 5	>would it be easier if another terminal window opened.. Is this a question or just poor word ordering? Yes, it would be easier because you wouldn't get bogged down in the details of creating and manipulating a window. You can simply use an existing program like xterm to do all of that for you, so that the end result is you simply write text to the standard output and everything will "just work".

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Programming Forums > Application Development > C++

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