auparse_init(3) [debian man page]

AUPARSE_INIT(3) 						  Linux Audit API						   AUPARSE_INIT(3)

NAME

       auparse_init - initialize an instance of the audit parsing library

SYNOPSIS

       #include <auparse.h>

       auparse_state_t *auparse_init(ausource_t source, const void *b);

DESCRIPTION

       auparse_init  initializes  an instance of the audit parsing library. The function returns an opaque pointer to the parser's internal state.
       It is used in subsequent calls to the library so. The source variable determines where the library looks for data. Legal values can be:

	    AUSOURCE_LOGS - use audit logs
	    AUSOURCE_FILE - use a file
	    AUSOURCE_FILE_ARRAY - use several files
	    AUSOURCE_BUFFER - use a buffer
	    AUSOURCE_BUFFER_ARRAY - use an array of buffers
	    AUSOURCE_DESCRIPTOR - use a particular descriptor
	    AUSOURCE_FILE_POINTER - use a stdio FILE pointer
	    AUSOURCE_FEED - feed data to parser with auparse_feed()

       The pointer 'b' is used to set the file name, array of filenames, the buffer address, or an array of pointers to buffers, or the descriptor
       number  based on what source is given. When the data source is an array of files or buffers, you would create an array of pointers with the
       last one being a NULL pointer. Buffers should be NUL terminated.

RETURN VALUE

       Returns a NULL pointer if an error occurs; otherwise, the return value is an aopaque pointer to the parser's internal state.

SEE ALSO

       auparse_reset(3), auparse_destroy(3).  auparse_feed(3).

AUTHOR

       Steve Grubb

Red Hat 							     Feb 2007							   AUPARSE_INIT(3)

AUPARSE_FEED(3) 						  Linux Audit API						   AUPARSE_FEED(3)

NAME

       auparse_feed - feed data into parser

SYNOPSIS

       #include <auparse.h>

       int auparse_feed(auparse_state_t *au, const char *data, size_t data_len);

       au     The audit parse state

       data   a  buffer  of  data to feed into the parser, it is data_len bytes long. The data is copied in the parser, upon return the caller may
	      free or reuse the data buffer.

       data_len
	      number of bytes in data

DESCRIPTION

       auparse_feed supplies new data for the parser to consume.  auparse_init() must have been called with a source type of AUSOURCE_FEED  and  a
       NULL pointer.

       The  parser  consumes  as much data as it can invoking a user supplied callback specified with auparse_add_callback with a cb_event_type of
       AUPARSE_CB_EVENT_READY each time the parser recognizes a complete event in the data stream. Data not  fully  parsed  will  persist  and	be
       prepended  to the next feed data. After all data has been feed to the parser auparse_flush_feed should be called to signal the end of input
       data and flush any pending parse data through the parsing system.

EXAMPLE

       void
       auparse_callback(auparse_state_t *au, auparse_cb_event_t cb_event_type,
			void *user_data)
       {
	   int *event_cnt = (int *)user_data;

	   if (cb_event_type == AUPARSE_CB_EVENT_READY) {
	       if (auparse_first_record(au) <= 0) return;
	       printf("event: %d
", *event_cnt);
	       printf("records:%d
", auparse_get_num_records(au));
	       do {
		   printf("fields:%d
", auparse_get_num_fields(au));
		   printf("type=%d ", auparse_get_type(au));
		   const au_event_t *e = auparse_get_timestamp(au);
		   if (e == NULL) return;
		   printf("event time: %u.%u:%lu
",
			   (unsigned)e->sec, e->milli, e->serial);
		   auparse_first_field(au);
		   do {
		       printf("%s=%s (%s)
", auparse_get_field_name(au),
			      auparse_get_field_str(au),
			      auparse_interpret_field(au));
		   } while (auparse_next_field(au) > 0);
		   printf("
");

	       } while(auparse_next_record(au) > 0);
	       (*event_cnt)++;
	   }
       }

       main(int argc, char **argv)
       {
	   char *filename = argv[1];
	   FILE *fp;
	   char buf[256];
	   size_t len;
	   int *event_cnt = malloc(sizeof(int));

	   au = auparse_init(AUSOURCE_FEED, 0);

	   *event_cnt = 1;
	   auparse_add_callback(au, auparse_callback, event_cnt, free);

	   if ((fp = fopen(filename, "r")) == NULL) {
	       fprintf(stderr, "could not open '%s', %s0, filename, strerror(errno));
	       return 1;
	   }

	   while ((len = fread(buf, 1, sizeof(buf), fp))) {
	       auparse_feed(au, buf, len);
	   }
	   auparse_flush_feed(au);
       }

RETURN VALUE

       Returns -1 if an error occurs; otherwise, 0 for success.

SEE ALSO

       auparse_add_callback(3), auparse_flush_feed(3)

AUTHOR

       John Dennis

Red Hat 							     May 2007							   AUPARSE_FEED(3)