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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* DIF directory
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define OUROBOROS_PREFIX "directory"
#include <ouroboros/config.h>
#include <ouroboros/endian.h>
#include <ouroboros/errno.h>
#include <ouroboros/logs.h>
#include <ouroboros/rib.h>
#include <ouroboros/utils.h>
#include "dir.h"
#include "dht.h"
#include "ipcp.h"
#include "ribconfig.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <inttypes.h>
#define KAD_B (hash_len(ipcpi.dir_hash_algo) * CHAR_BIT)
#define ENROL_RETR 6
#define ENROL_INTV 1
struct dht * dht;
static uint64_t find_peer_addr(void)
{
ssize_t i;
char ** members;
ssize_t n_members;
size_t reset;
char path[RIB_MAX_PATH_LEN + 1];
strcpy(path, MEMBERS_PATH);
reset = strlen(path);
n_members = rib_children(path, &members);
if (n_members == 1) {
freepp(ssize_t, members, n_members);
return 0;
}
for (i = 0; i < n_members; ++i) {
uint64_t addr;
rib_path_append(path, members[i]);
if (rib_read(path, &addr, sizeof(addr)) != sizeof(addr)) {
log_err("Failed to read address from RIB.");
freepp(ssize_t, members, n_members);
return ipcpi.dt_addr;
}
if (addr != ipcpi.dt_addr) {
freepp(ssize_t, members, n_members);
return addr;
}
path[reset] = '\0';
}
freepp(ssize_t, members, n_members);
return 0;
}
int dir_init()
{
uint64_t addr;
dht = dht_create(ipcpi.dt_addr);
if (dht == NULL)
return -ENOMEM;
addr = find_peer_addr();
if (addr == ipcpi.dt_addr) {
log_err("Failed to get peer address.");
dht_destroy(dht);
return -EPERM;
}
if (addr != 0) {
size_t retr = 0;
log_dbg("Enrolling directory with peer %" PRIu64 ".", addr);
/* NOTE: we could try other members if dht_enroll times out. */
while (dht_enroll(dht, addr)) {
if (retr++ == ENROL_RETR) {
dht_destroy(dht);
return -EPERM;
}
log_dbg("Directory enrollment failed, retrying...");
sleep(ENROL_INTV);
}
log_dbg("Directory enrolled.");
return 0;
}
log_dbg("Bootstrapping directory.");
/* TODO: get parameters for bootstrap from IRM tool. */
if (dht_bootstrap(dht, KAD_B, 86400)) {
dht_destroy(dht);
return -ENOMEM;
}
log_dbg("Directory bootstrapped.");
return 0;
}
void dir_fini(void)
{
dht_destroy(dht);
}
int dir_reg(const uint8_t * hash)
{
return dht_reg(dht, hash);
}
int dir_unreg(const uint8_t * hash)
{
return dht_unreg(dht, hash);
}
uint64_t dir_query(const uint8_t * hash)
{
return dht_query(dht, hash);
}
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