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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Enrollment Task
*
* Dimitri Staessens <dimitri.staessens@intec.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 "enrollment"
#include <ouroboros/config.h>
#include <ouroboros/endian.h>
#include <ouroboros/time_utils.h>
#include <ouroboros/cdap.h>
#include <ouroboros/dev.h>
#include <ouroboros/logs.h>
#include <ouroboros/rib.h>
#include "ae.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
/* Symbolic, will return current time */
#define TIME_NAME "localtime"
#define ENROLL_WARN_TIME_OFFSET 20
#define DLR "/"
#define DIF_PATH DLR DIF_NAME
#define BOOT_PATH DLR BOOT_NAME
#define MEMBERS_PATH DLR MEMBERS_NAME
#define TIME_PATH DLR TIME_NAME
int enroll_handle(int fd)
{
struct cdap * ci;
cdap_key_t key;
enum cdap_opcode oc;
char * name;
uint8_t * buf;
uint8_t * data;
ssize_t len;
uint32_t flags;
bool boot_r = false;
bool members_r = false;
bool dif_name_r = false;
char * boot_ro = BOOT_PATH;
char * members_ro = MEMBERS_PATH;
char * dif_ro = DIF_PATH;
if (flow_alloc_resp(fd, 0) < 0) {
flow_dealloc(fd);
log_err("Could not respond to request.");
return -1;
}
ci = cdap_create(fd);
if (ci == NULL) {
flow_dealloc(fd);
log_err("Failed to create CDAP instance.");
return -1;
}
while (!(boot_r && members_r && dif_name_r)) {
key = cdap_request_wait(ci, &oc, &name, &data,
(size_t *) &len , &flags);
assert(key >= 0);
assert(name);
if (data != NULL) {
free(data);
log_warn("Received data with enrollment request.");
}
if (oc != CDAP_READ) {
log_warn("Invalid request.");
cdap_reply_send(ci, key, -1, NULL, 0);
cdap_destroy(ci);
flow_dealloc(fd);
free(name);
return -1;
}
if (strcmp(name, boot_ro) == 0) {
boot_r = true;
} else if (strcmp(name, members_ro) == 0) {
members_r = true;
} else if (strcmp(name, dif_ro) == 0) {
dif_name_r = true;
} else if (strcmp(name, TIME_PATH) == 0) {
struct timespec t;
uint64_t buf[2];
clock_gettime(CLOCK_REALTIME, &t);
buf[0] = hton64(t.tv_sec);
buf[1] = hton64(t.tv_nsec);
cdap_reply_send(ci, key, 0, buf, sizeof(buf));
free(name);
continue;
} else {
log_warn("Illegal read: %s.", name);
cdap_reply_send(ci, key, -1, NULL, 0);
cdap_destroy(ci);
flow_dealloc(fd);
free(name);
return -1;
}
len = rib_pack(name, &buf, PACK_HASH_ROOT);
if (len < 0) {
log_err("Failed to pack %s.", name);
cdap_reply_send(ci, key, -1, NULL, 0);
cdap_destroy(ci);
flow_dealloc(fd);
free(name);
return -1;
}
log_dbg("Packed %s (%zu bytes).", name, len);
free(name);
if (cdap_reply_send(ci, key, 0, buf, len)) {
log_err("Failed to send CDAP reply.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
free(buf);
}
log_dbg("Sent boot info to new member.");
cdap_destroy(ci);
flow_dealloc(fd);
return 0;
}
int enroll_boot(char * dst_name)
{
struct cdap * ci;
cdap_key_t key;
uint8_t * data;
size_t len;
int fd;
struct timespec t0;
struct timespec rtt;
ssize_t delta_t;
char * boot_ro = BOOT_PATH;
char * members_ro = MEMBERS_PATH;
char * dif_ro = DIF_PATH;
fd = flow_alloc(dst_name, ENROLL_AE, NULL);
if (fd < 0) {
log_err("Failed to allocate flow.");
return -1;
}
if (flow_alloc_res(fd)) {
log_err("Flow allocation failed.");
flow_dealloc(fd);
return -1;
}
ci = cdap_create(fd);
if (ci == NULL) {
log_err("Failed to create CDAP instance.");
flow_dealloc(fd);
return -1;
}
log_dbg("Getting boot information from %s.", dst_name);
clock_gettime(CLOCK_REALTIME, &t0);
key = cdap_request_send(ci, CDAP_READ, TIME_PATH, NULL, 0, 0);
if (key < 0) {
log_err("Failed to send CDAP request.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
if (cdap_reply_wait(ci, key, &data, &len)) {
log_err("Failed to get CDAP reply.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
clock_gettime(CLOCK_REALTIME, &rtt);
delta_t = ts_diff_ms(&t0, &rtt);
assert (len == 2 * sizeof (uint64_t));
rtt.tv_sec = ntoh64(((uint64_t *) data)[0]);
rtt.tv_nsec = ntoh64(((uint64_t *) data)[1]);
if (labs(ts_diff_ms(&t0, &rtt)) - delta_t > ENROLL_WARN_TIME_OFFSET)
log_warn("Clock offset above threshold.");
free(data);
key = cdap_request_send(ci, CDAP_READ, boot_ro, NULL, 0, 0);
if (key < 0) {
log_err("Failed to send CDAP request.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
if (cdap_reply_wait(ci, key, &data, &len)) {
log_err("Failed to get CDAP reply.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information received (%zu bytes).", len);
if (rib_unpack(data, len, UNPACK_CREATE)) {
log_warn("Error unpacking RIB data.");
rib_del(boot_ro);
free(data);
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information inserted into RIB.");
key = cdap_request_send(ci, CDAP_READ, members_ro, NULL, 0, 0);
if (key < 0) {
log_err("Failed to send CDAP request.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
if (cdap_reply_wait(ci, key, &data, &len)) {
log_err("Failed to get CDAP reply.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information received (%zu bytes).", len);
if (rib_unpack(data, len, UNPACK_CREATE)) {
log_warn("Error unpacking RIB data.");
rib_del(boot_ro);
free(data);
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information inserted into RIB.");
key = cdap_request_send(ci, CDAP_READ, dif_ro, NULL, 0, 0);
if (key < 0) {
log_err("Failed to send CDAP request.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
if (cdap_reply_wait(ci, key, &data, &len)) {
log_err("Failed to get CDAP reply.");
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information received (%zu bytes).", len);
if (rib_unpack(data, len, UNPACK_CREATE)) {
log_warn("Error unpacking RIB data.");
rib_del(boot_ro);
free(data);
cdap_destroy(ci);
flow_dealloc(fd);
return -1;
}
log_dbg("Packed information inserted into RIB.");
cdap_destroy(ci);
flow_dealloc(fd);
return 0;
}
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