1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* 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);
}
return 0;
}
log_dbg("Bootstrapping DHT.");
/* TODO: get parameters for bootstrap from IRM tool. */
if (dht_bootstrap(dht, KAD_B, 86400)) {
dht_destroy(dht);
return -ENOMEM;
}
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);
}
|
