auparse_feed(3) — Linux manual page


AUPARSE_FEED(3)              Linux Audit API             AUPARSE_FEED(3)

NAME         top

       auparse_feed - feed data into parser

SYNOPSIS         top

       #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.

              number of bytes in data

DESCRIPTION         top

       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.

RETURN VALUE         top

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

EXAMPLE         top

       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: %lu.%u:%lu\n",
                           (long unsigned)e->sec, e->milli, e->serial);
                   do {
                       printf("%s=%s (%s)\n", auparse_get_field_name(au),
                   } while (auparse_next_field(au) > 0);

               } while(auparse_next_record(au) > 0);

       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);

SEE ALSO         top

       auparse_add_callback(3), auparse_flush_feed(3),
       auparse_feed_age_events(3), auparse_feed_has_data(3),

AUTHOR         top

       John Dennis

COLOPHON         top

       This page is part of the audit (Linux Audit) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, send it to
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on
       2023-12-22.  (At that time, the date of the most recent commit
       that was found in the repository was 2023-11-30.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to

Red Hat                         Sept 2023                AUPARSE_FEED(3)

Pages that refer to this page: auparse_add_callback(3)auparse_feed_age_events(3)auparse_feed_has_data(3)auparse_flush_feed(3)auparse_init(3)auparse_metrics(3)auditd-plugins(5)