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/* mod_test - example ncaptool message processing plugin */
/*
* Copyright (c) 2008 by Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "ncaptool.h"
#define SEED "/dev/urandom"
static int test_init(struct ncaptool_ctx *, int, char **);
static int test_fini(void);
static int test_proc(ncap_t, void *, ncap_msg_ct, const char *);
static void usage(const char *msg);
struct ncaptool_msgmod ncaptool_msgmod_ctx =
{
.mver = NCAPTOOL_MSGMOD_VERSION,
.name = "mod_test",
.init = &test_init,
.fini = &test_fini,
.proc = &test_proc
};
static struct ncaptool_ctx *ctx;
static int mode_random;
static int mode_skip;
static int count;
static int
test_init(struct ncaptool_ctx *my_ctx, int argc, char **argv) {
int ch;
int fd;
char *t;
unsigned seed;
ctx = my_ctx;
while ((ch = getopt(argc, argv, "rs:")) != -1) {
switch (ch) {
case 'r':
mode_random = 1;
if ((fd = open(SEED, O_RDONLY)) != -1) {
if (read(fd, &seed, sizeof seed)
== sizeof seed)
{
srandom(seed);
close(fd);
} else {
perror("read");
close(fd);
return (-1);
}
} else {
perror("open");
return (-1);
}
break;
case 's':
mode_skip = strtoul(optarg, &t, 0);
if (*t != '\0') {
usage("bad -s number");
return (-1);
}
if(mode_skip < 1) {
usage("-s must be > 0");
return (-1);
}
break;
default:
usage("unrecognized argument");
return (-1);
}
}
if (mode_random == 0 && mode_skip == 0) {
usage("must set -r or -s");
return (-1);
}
return (0);
}
static int
test_fini(void) {
return (0);
}
static int
test_proc(ncap_t n __attribute__((unused)),
void *user __attribute__((unused)),
ncap_msg_ct msg __attribute__((unused)),
const char *label __attribute__((unused)))
{
if (mode_skip != 0) {
count++;
if(count % mode_skip == 0) {
return (1);
} else {
return (0);
}
} else if (random() & 1) {
return (1);
}
return (0);
}
static void
usage(const char *msg) {
const char *name = ncaptool_msgmod_ctx.name;
fprintf(stderr, "%s] usage error (%s)\n", name, msg);
fprintf(stderr, "%s] options are:\n", name);
fprintf(stderr, "%s]\t-r random mode\n", name);
fprintf(stderr, "%s]\t-s n skip n frames at a time\n", name);
}
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