auparse_feed

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\n", *event_cnt);
               printf("records:%d\n", auparse_get_num_records(au));
               do {
                   printf("fields:%d\n", 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\n",
                           (unsigned)e->sec, e->milli, e->serial);
                   auparse_first_field(au);
                   do {
                       printf("%s=%s (%s)\n", auparse_get_field_name(au),
                              auparse_get_field_str(au),
                              auparse_interpret_field(au));
                   } while (auparse_next_field(au) > 0);
                   printf("\n");

               } 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', %s\n", 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),
       auparse_feed_age_events(3), auparse_feed_has_data(3)



AUTHOR
       John Dennis



Red Hat                            May 2007                    AUPARSE_FEED(3)