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/*
* mod_delay.c
*
* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
*
* $Id: mod_delay.c,v 1.4 2002/04/07 22:55:20 dugsong Exp $
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pkt.h"
#include "mod.h"
#define DELAY_FIRST 1
#define DELAY_LAST 2
#define DELAY_RANDOM 3
struct delay_data {
rand_t *rnd;
int which;
struct timeval tv;
};
void *
delay_close(void *d)
{
struct delay_data *data = (struct delay_data *)d;
if (data != NULL) {
rand_close(data->rnd);
free(data);
}
return (NULL);
}
void *
delay_open(int argc, char *argv[])
{
struct delay_data *data;
uint64_t usec;
if (argc != 3)
return (NULL);
if ((data = malloc(sizeof(*data))) == NULL)
return (NULL);
data->rnd = rand_open();
if (strcasecmp(argv[1], "first") == 0)
data->which = DELAY_FIRST;
else if (strcasecmp(argv[1], "last") == 0)
data->which = DELAY_LAST;
else if (strcasecmp(argv[1], "random") == 0)
data->which = DELAY_RANDOM;
else
return (delay_close(data));
if ((usec = atoi(argv[2])) <= 0)
return (delay_close(data));
usec *= 1000;
data->tv.tv_sec = usec / 1000000;
data->tv.tv_usec = usec % 1000000;
return (data);
}
int
delay_apply(void *d, struct pktq *pktq)
{
struct delay_data *data = (struct delay_data *)d;
struct pkt *pkt;
if (data->which == DELAY_FIRST)
pkt = TAILQ_FIRST(pktq);
else if (data->which == DELAY_LAST)
pkt = TAILQ_LAST(pktq, pktq);
else
pkt = pktq_random(data->rnd, pktq);
memcpy(&pkt->pkt_ts, &data->tv, sizeof(pkt->pkt_ts));
return (0);
}
struct mod mod_delay = {
"delay", /* name */
"delay first|last|random <ms>", /* usage */
delay_open, /* open */
delay_apply, /* apply */
delay_close /* close */
};
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