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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Anonymous policy for CACEP
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <ouroboros/config.h>
#include <ouroboros/cacep.h>
#include <ouroboros/time_utils.h>
#include <ouroboros/dev.h>
#include <ouroboros/errno.h>
#include "cacep_proto.h"
#include "cacep_anonymous_auth.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <stdio.h>
#include "cacep_anonymous_auth.pb-c.h"
typedef CacepAnonymousAuthMsg cacep_anonymous_auth_msg_t;
typedef CacepProtoMsg cacep_proto_msg_t;
#define BUF_SIZE 2048
#define NAME_LEN 8
/* this policy generates a hex string */
static struct cacep_info * anonymous_info(void)
{
struct cacep_info * info;
struct timespec t;
info = malloc(sizeof(*info));
if (info == NULL)
return NULL;
info->name = malloc(NAME_LEN + 1);
if (info->name == NULL) {
free(info);
return NULL;
}
clock_gettime(CLOCK_REALTIME, &t);
srand(t.tv_nsec);
sprintf(info->name, "%8x",
(uint32_t)((rand() % RAND_MAX) & 0xFFFFFFFF));
info->addr = 0;
return info;
}
static struct cacep_info * read_msg(int fd)
{
struct cacep_info * tmp;
uint8_t buf[BUF_SIZE];
cacep_anonymous_auth_msg_t * msg;
ssize_t len;
len = flow_read(fd, buf, BUF_SIZE);
if (len < 0)
return NULL;
msg = cacep_anonymous_auth_msg__unpack(NULL, len, buf);
if (msg == NULL)
return NULL;
tmp = anonymous_info();
if (tmp == NULL) {
cacep_anonymous_auth_msg__free_unpacked(msg, NULL);
return NULL;
}
tmp->proto.protocol = strdup(msg->proto->protocol);
if (tmp->proto.protocol == NULL) {
free(tmp);
cacep_anonymous_auth_msg__free_unpacked(msg, NULL);
return NULL;
}
tmp->proto.pref_version = msg->proto->pref_version;
tmp->proto.pref_syntax = code_to_syntax(msg->proto->pref_syntax);
if (tmp->proto.pref_syntax < 0) {
free(tmp->proto.protocol);
free(tmp);
cacep_anonymous_auth_msg__free_unpacked(msg, NULL);
return NULL;
}
cacep_anonymous_auth_msg__free_unpacked(msg, NULL);
return tmp;
}
static int send_msg(int fd,
const struct cacep_info * info)
{
cacep_anonymous_auth_msg_t msg = CACEP_ANONYMOUS_AUTH_MSG__INIT;
cacep_proto_msg_t cmsg = CACEP_PROTO_MSG__INIT;
int ret = 0;
uint8_t * data = NULL;
size_t len = 0;
cmsg.protocol = info->proto.protocol;
cmsg.pref_version = info->proto.pref_version;
cmsg.pref_syntax = syntax_to_code(info->proto.pref_syntax);
if (cmsg.pref_syntax < 0)
return -1;
msg.proto = &cmsg;
len = cacep_anonymous_auth_msg__get_packed_size(&msg);
if (len == 0)
return -1;
data = malloc(len);
if (data == NULL)
return -ENOMEM;
cacep_anonymous_auth_msg__pack(&msg, data);
if (flow_write(fd, data, len) < 0)
ret = -1;
free(data);
return ret;
}
struct cacep_info * cacep_anonymous_auth(int fd,
const struct cacep_info * info)
{
struct cacep_info * tmp;
if (send_msg(fd, info))
return NULL;
tmp = read_msg(fd);
if (tmp == NULL)
return NULL;
if (strcmp(info->proto.protocol, tmp->proto.protocol) ||
info->proto.pref_version != tmp->proto.pref_version ||
info->proto.pref_syntax != tmp->proto.pref_syntax) {
free(tmp);
return NULL;
}
tmp->data = NULL;
return tmp;
}
struct cacep_info * cacep_anonymous_auth_wait(int fd,
const struct cacep_info * info)
{
struct cacep_info * tmp;
tmp = read_msg(fd);
if (tmp == NULL)
return NULL;
if (send_msg(fd, info)) {
free(tmp);
return NULL;
}
if (strcmp(info->proto.protocol, tmp->proto.protocol) ||
info->proto.pref_version != tmp->proto.pref_version ||
info->proto.pref_syntax != tmp->proto.pref_syntax) {
free(tmp);
return NULL;
}
tmp->data = NULL;
return tmp;
}
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