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#define _POSIX_C_SOURCE 200809L
#include <arpa/inet.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <time.h>
#include "dbg.h"
#include "khash.h"
#include "lease.h"
#include "netlink.h"
#include "radix-trie.h"
#include "random.h"
#define TIME_T_MAX (((time_t)1 << (sizeof(time_t) * CHAR_BIT - 2)) - 1) * 2 + 1
static struct ip_pool pool;
static time_t gexpires = TIME_T_MAX;
KHASH_MAP_INIT_WGKEY(leaseht, struct wg_dynamic_lease *)
khash_t(leaseht) * leases_ht;
static time_t get_monotonic_time()
{
struct timespec monotime;
#ifdef __linux__
if (clock_gettime(CLOCK_BOOTTIME, &monotime))
fatal("clock_gettime(CLOCK_BOOTTIME)");
#else
/* CLOCK_MONOTONIC works on openbsd, but apparently not (yet) on
* freebsd: https://lists.freebsd.org/pipermail/freebsd-hackers/2018-June/052899.html
*/
if (clock_gettime(CLOCK_MONOTONIC, &monotime))
fatal("clock_gettime(CLOCK_MONOTONIC)");
#endif
/* TODO: what about darwin? */
return monotime.tv_sec;
}
void leases_init(char *fname)
{
UNUSED(fname); /* TODO: open file and initialize from it */
leases_ht = kh_init(leaseht);
ipp_init(&pool);
/* TODO: initialize pool properly from routes */
struct in_addr pool1_v4, pool2_v4;
struct in6_addr pool1_v6, pool2_v6;
inet_pton(AF_INET, "192.168.4.0", &pool1_v4);
inet_pton(AF_INET, "192.168.73.0", &pool2_v4);
inet_pton(AF_INET6, "2001:db8:1234::", &pool1_v6);
inet_pton(AF_INET6, "2001:db8:7777::", &pool2_v6);
ipp_addpool_v4(&pool, &pool1_v4, 28);
ipp_addpool_v4(&pool, &pool2_v4, 27);
ipp_addpool_v6(&pool, &pool1_v6, 124);
ipp_addpool_v6(&pool, &pool2_v6, 124);
}
void leases_free()
{
kh_destroy(leaseht, leases_ht);
ipp_free(&pool);
}
struct wg_dynamic_lease *new_lease(wg_key pubkey, uint32_t leasetime,
struct in_addr *ipv4, struct in6_addr *ipv6)
{
struct wg_dynamic_lease *lease, *parent;
uint64_t index_l;
uint32_t index, index_h;
struct timespec tp;
khiter_t k;
int ret;
bool wants_ipv4 = !ipv4 || ipv4->s_addr;
bool wants_ipv6 = !ipv6 || !IN6_IS_ADDR_UNSPECIFIED(ipv6);
lease = malloc(sizeof *lease);
if (!lease)
fatal("malloc()");
if (wants_ipv4 && !pool.total_ipv4)
return NULL; /* no ipv4 addresses available */
if (wants_ipv6 && !pool.totalh_ipv6 && !pool.totall_ipv6)
return NULL; /* no ipv6 addresses available */
if (wants_ipv4) {
if (!ipv4) {
index = random_bounded(pool.total_ipv4 - 1);
debug("new_lease(v4): %u of %u\n", index,
pool.total_ipv4);
ipp_addnth_v4(&pool, &lease->ipv4, index);
} else {
if (ipp_add_v4(&pool, ipv4, 32))
return NULL;
memcpy(&lease->ipv4, ipv4, sizeof *ipv4);
}
}
if (wants_ipv6) {
if (!ipv6) {
if (pool.totalh_ipv6 > 0) {
index_l = random_bounded(UINT64_MAX);
index_h = random_bounded(pool.totalh_ipv6 - 1);
} else {
index_l = random_bounded(pool.totall_ipv6 - 1);
index_h = 0;
}
debug("new_lease(v6): %u:%ju of %u:%ju\n", index_h,
index_l, pool.totalh_ipv6, pool.totall_ipv6);
ipp_addnth_v6(&pool, &lease->ipv6, index_l, index_h);
} else {
if (ipp_add_v6(&pool, ipv6, 128)) {
if (!ipv4 || ipv4->s_addr)
ipp_del_v4(&pool, ipv4, 32);
return NULL;
}
memcpy(&lease->ipv6, ipv6, sizeof *ipv6);
}
}
if (clock_gettime(CLOCK_REALTIME, &tp))
fatal("clock_gettime(CLOCK_REALTIME)");
lease->start_real = tp.tv_sec;
lease->start_mono = get_monotonic_time();
lease->leasetime = leasetime;
lease->next = NULL;
k = kh_put(leaseht, leases_ht, pubkey, &ret);
if (ret < 0) {
fatal("kh_put()");
} else if (ret == 0) {
parent = kh_value(leases_ht, k);
while (parent->next)
parent = parent->next;
parent->next = lease;
} else {
kh_value(leases_ht, k) = lease;
}
if (lease->start_mono + lease->leasetime < gexpires)
gexpires = lease->start_mono + lease->leasetime;
/* TODO: add record to file */
return lease;
}
struct wg_dynamic_lease *get_leases(wg_key pubkey)
{
khiter_t k = kh_get(leaseht, leases_ht, pubkey);
if (k == kh_end(leases_ht))
return NULL;
else
return kh_val(leases_ht, k);
}
bool extend_lease(struct wg_dynamic_lease *lease, uint32_t leasetime)
{
UNUSED(lease);
UNUSED(leasetime);
return false;
}
int leases_refresh()
{
time_t cur_time = get_monotonic_time();
if (cur_time < gexpires)
return MIN(INT_MAX / 1000, gexpires - cur_time);
gexpires = TIME_T_MAX;
for (khint_t k = kh_begin(leases_ht); k != kh_end(leases_ht); ++k) {
if (!kh_exist(leases_ht, k))
continue;
struct wg_dynamic_lease **pp = &kh_val(leases_ht, k), *tmp;
while (*pp) {
struct in_addr *ipv4 = &(*pp)->ipv4;
struct in6_addr *ipv6 = &(*pp)->ipv6;
time_t expires = (*pp)->start_mono + (*pp)->leasetime;
if (cur_time >= expires) {
if (ipv4->s_addr)
ipp_del_v4(&pool, ipv4, 32);
if (!IN6_IS_ADDR_UNSPECIFIED(ipv6))
ipp_del_v6(&pool, ipv6, 128);
tmp = *pp;
*pp = (*pp)->next;
free(tmp);
} else {
if (expires < gexpires)
gexpires = expires;
pp = &(*pp)->next;
}
}
if (!kh_val(leases_ht, k))
kh_del(leaseht, leases_ht, k);
}
return MIN(INT_MAX / 1000, gexpires - cur_time);
}
void leases_update_pools(int fd)
{
UNUSED(fd);
}
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