RE: [Ntop] Format for WWN Mapper File (-N)

Burton Strauss Fri, 18 Mar 2005 14:05:27 -0800

Title: Format for WWN Mapper File (-N)

Since I don't know beans about <problem domain>, I don't understand what it's doing. But if you understand <problem domain>, C code isn't THAT hard to read at a crude level...

So here's how to find things in the code:

1. unpack the source

2. grep 'meaningfulname' *.[ch]

For example, if it's the --wwn-map option, grep for wwn-map that will show you the mapping from long -> short names. If you already know this, start at step 3...

3. in prefs.c, find the short name, e.g. 'N':

    case 'N':
      pathSanityCheck(optarg, "-N | --wwn-map");
      if (myGlobals.runningPref.fcNSCacheFile != NULL)
        free (myGlobals.runningPref.fcNSCacheFile);
      myGlobals.runningPref.fcNSCacheFile = strdup (optarg);
      break;

That tells you the 'magic token' to look for is myGlobals.runningPref.fcNSCacheFile

grep for that...

$ grep --line-number myGlobals.runningPref.fcNSCacheFile *.[ch]
main.c:480: if (!myGlobals.runningPref.printIpOnly && (myGlobals.runningPref.fcNSCacheFile != NULL)) {
main.c:481:      processFcNSCacheFile (myGlobals.runningPref.fcNSCacheFile);
prefs.c:483:      if (myGlobals.runningPref.fcNSCacheFile != NULL)
prefs.c:484:    free (myGlobals.runningPref.fcNSCacheFile);
prefs.c:485:      myGlobals.runningPref.fcNSCacheFile = strdup (optarg);

The interesting one is usually the function or something NOT in prefs/main/ntop/admin... so:

$ grep --line-number processFcNSCacheFile *.[ch]
fcUtils.c:501:void processFcNSCacheFile(char *filename) {
globals-core.h:720:extern void processFcNSCacheFile(char *filename);
main.c:481: processFcNSCacheFile (myGlobals.runningPref.fcNSCacheFile);
15:48:22 tigger [Linux] user=ntop pwd=~/projects/ntop/work/ntop $ vi fcUtils.c -c :501

4. Start reading the code in fcUtils.c beginning at 501...

-----Burton

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rueda, Astolfo (SEA)
Sent: Friday, March 18, 2005 12:54 PM
To: [email protected]
Subject: [Ntop] Format for WWN Mapper File (-N)

Does anyone know what the format for this is. I tried a few different things but none worked.

TIA

Astolfo Rueda

Network Administrator

Preston | Gates | Ellis LLP

925 Fourth Avenue,

Suite 2900 Seattle

WA 98104

206-623-7580

206-370-5901

Fax 206-623-7022

“If you obey to rules, you'll miss all the fun”

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RE: [Ntop] Format for WWN Mapper File (-N)

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