/* getxattrs.c
 * 
 * by Dean Giles
 * 
 * Version 1.0.
 * November 30, 2006
 *
 * This program retrieves and displays the data kept in the netware.metadata extended attribute on 
 * an NSS file on a Linux server.
 *
 * For the this Utility to work on SLES 9 OES1 SP2 the kernel needs to be at the 282 (2.6.5-7.282).
 * It also requires the following patches:
 * km-nss-4.9.26-0.1.i586.rpm
 * novell-nss-4.9.23-1.i586.rpm
 * novell-sms-zapishim-2.6.5_7.282-1.0.5.i586.rpm
 *
 * NSS must be installed and running.
 *
 * The following parameters must be set from NSSCON
 * NSS /ListXattrNWMetadata
 * NSS /CtimeISMetadataModTime
 *
 */


#include <sys/types.h> //Needed for malloc().
#include <sys/xattr.h> //Needed for listxattr().
#include <sys/errno.h> //Needed for errno.

void main(int argc, char** argv)
{
    const char* path=argv[1]; // Holds the path and the file name. 
    ssize_t result, newresult; // Holds the size of data or return codes for function calls.
    char* list;  // Holds the list of extended attributes.
    char* value;
    int i;

    list = malloc(128);  //Create storage for the list of extended attributs.
    result = listxattr(path, list, 128); // get the list of extended attributes.
    
    if (result == -1)  // Return code of -1 means an error.  errno is set with error code.
    	printf("listxattr failed with errno set to %d.\n",errno);
    	
    else    	
    {
    	printf("The file %s ",path);
    	printf("has the extended attribute(s) %s (the string takes up %d bytes).\n", list, result);
    }
    
    value = malloc(32); // Create storage for what is kept in the extended attribute.
    result = getxattr(path, "netware.metadata", value, 0); // This gets the size of the data in the extended attribute.
    
    if (result == -1)  // Return code of -1 means an error.  errno is set with error code.
    	printf("getxattr failed with errno set to %d.",errno);
    else
    {
    	printf("There are %d byts of data in the %s extended attribute(s).\n\n", result, list);
   	printf("A dump of the extended attribute %s is the following:\n", list);
    	
    	free(value);
    	value = malloc(result); // Allocate amount of storage needed for this extended attribute. 
    	newresult = getxattr(path, "netware.metadata", value, result); // This time get the data in the netware.metadata xattr.
    	
	if (newresult == -1) // Return code of -1 means an error.  errno is set with error code.
		printf("getxattr failed with errno set to %d.",errno);
	else
	{
    		for (i = 0; i < result; i++)
        		printf("%08x ", *(value + i)); //print out the data in hex as words.
	}
	
	printf("\n");
      
    }
        
    free(list); // clean up allocated memory.
    free(value);
     
}