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#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include "ppp.h"
#include "events.h"
#include "triton.h"
#include "log.h"
#include "memdebug.h"
struct item
{
struct list_head entry;
uint64_t key;
struct timespec ts;
int count;
};
static int conf_burst = 3;
static int conf_burst_timeout = 60 * 1000;
static int conf_limit_timeout = 5000;
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static LIST_HEAD(items);
int __export connlimit_check(uint64_t key)
{
struct item *it;
struct timespec ts;
unsigned int d;
struct list_head *pos, *n;
LIST_HEAD(tmp_list);
int r = 1;
clock_gettime(CLOCK_MONOTONIC, &ts);
pthread_mutex_lock(&lock);
log_debug("connlimit: check entry %" PRIu64 "\n", key);
list_for_each_safe(pos, n, &items) {
it = list_entry(pos, typeof(*it), entry);
d = (ts.tv_sec - it->ts.tv_sec) * 1000 + (ts.tv_nsec - it->ts.tv_nsec) / 1000000;
if (it->key == key) {
if (d >= conf_burst_timeout) {
it->ts = ts;
list_move(&it->entry, &items);
it->count = 0;
r = 0;
break;
}
it->count++;
if (it->count >= conf_burst) {
if (d >= conf_limit_timeout) {
it->ts = ts;
list_move(&it->entry, &items);
r = 0;
} else
r = -1;
} else
r = 0;
break;
}
if (d > conf_burst_timeout) {
log_debug("connlimit: remove %" PRIu64 "\n", it->key);
list_move(&it->entry, &tmp_list);
}
}
pthread_mutex_unlock(&lock);
if (r == 1) {
it = _malloc(sizeof(*it));
memset(it, 0, sizeof(*it));
it->ts = ts;
it->key = key;
log_debug("connlimit: add entry %" PRIu64 "\n", key);
pthread_mutex_lock(&lock);
list_add(&it->entry, &items);
pthread_mutex_unlock(&lock);
r = 0;
}
if (r == 0)
log_debug("connlimit: accept %" PRIu64 "\n", key);
else
log_debug("connlimit: drop %" PRIu64 "\n", key);
while (!list_empty(&tmp_list)) {
it = list_entry(tmp_list.next, typeof(*it), entry);
list_del(&it->entry);
_free(it);
}
return r;
}
static int parse_limit(const char *opt, int *limit, int *time)
{
char *endptr;
*limit = strtol(opt, &endptr, 10);
if (!*endptr) {
*time = 1;
return 0;
}
if (*endptr != '/')
goto out_err;
opt = endptr + 1;
*time = strtol(opt, &endptr, 10);
if (endptr == opt)
*time = 1;
if (*endptr == 's')
return 0;
if (*endptr == 'm') {
*time *= 60;
return 0;
}
if (*endptr == 'h') {
*time *= 3600;
return 0;
}
out_err:
log_error("connlimit: failed to parse '%s'\n", opt);
return -1;
}
static void load_config()
{
const char *opt;
int n,t;
opt = conf_get_opt("connlimit", "limit");
if (opt) {
if (parse_limit(opt, &n, &t))
return;
conf_limit_timeout = t * 1000 / n;
}
opt = conf_get_opt("connlimit", "burst");
if (opt)
conf_burst = atoi(opt);
opt = conf_get_opt("connlimit", "timeout");
if (opt)
conf_burst_timeout = atoi(opt) * 1000;
}
static void init()
{
load_config();
triton_event_register_handler(EV_CONFIG_RELOAD, (triton_event_func)load_config);
}
DEFINE_INIT(200, init);
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