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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Simon Wunderlich
*
* License-Filename: LICENSES/preferred/GPL-2.0
*/
#include <netinet/in.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <sys/socket.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "alfred.h"
#include "hash.h"
#include "packet.h"
#include "list.h"
int announce_primary(struct globals *globals)
{
struct alfred_announce_primary_v0 announcement;
struct interface *interface;
list_for_each_entry(interface, &globals->interfaces, list) {
announcement.header.type = ALFRED_ANNOUNCE_PRIMARY;
announcement.header.version = ALFRED_VERSION;
announcement.header.length = htons(0);
send_alfred_packet(globals, interface, &alfred_mcast,
&announcement, sizeof(announcement));
}
return 0;
}
int push_data(struct globals *globals, struct interface *interface,
alfred_addr *destination, enum data_source max_source_level,
int type_filter, uint16_t tx_id)
{
struct hash_it_t *hashit = NULL;
uint8_t buf[MAX_PAYLOAD];
struct alfred_push_data_v0 *push;
struct alfred_data *data;
uint16_t total_length = 0;
size_t tlv_length;
uint16_t seqno = 0;
uint16_t length;
struct alfred_status_v0 status_end;
push = (struct alfred_push_data_v0 *)buf;
push->header.type = ALFRED_PUSH_DATA;
push->header.version = ALFRED_VERSION;
push->tx.id = tx_id;
while (NULL != (hashit = hash_iterate(globals->data_hash, hashit))) {
struct dataset *dataset = hashit->bucket->data;
if (dataset->data_source > max_source_level)
continue;
if (type_filter >= 0 &&
dataset->data.header.type != type_filter)
continue;
/* would the packet be too big? send so far aggregated data
* first */
if (total_length + dataset->data.header.length + sizeof(*data) >
MAX_PAYLOAD - sizeof(*push)) {
/* is there any data to send? */
if (total_length == 0)
continue;
tlv_length = total_length;
tlv_length += sizeof(*push) - sizeof(push->header);
push->header.length = htons(tlv_length);
push->tx.seqno = htons(seqno++);
send_alfred_packet(globals, interface, destination, push,
sizeof(*push) + total_length);
total_length = 0;
}
/* still too large? - should never happen */
if (total_length + dataset->data.header.length + sizeof(*data) >
MAX_PAYLOAD - sizeof(*push))
continue;
data = (struct alfred_data *)
(buf + sizeof(*push) + total_length);
memcpy(data, &dataset->data, sizeof(*data));
data->header.length = htons(data->header.length);
memcpy(data->data, dataset->buf, dataset->data.header.length);
total_length += dataset->data.header.length + sizeof(*data);
}
/* send the final packet */
if (total_length) {
tlv_length = total_length;
tlv_length += sizeof(*push) - sizeof(push->header);
push->header.length = htons(tlv_length);
push->tx.seqno = htons(seqno++);
send_alfred_packet(globals, interface, destination, push,
sizeof(*push) + total_length);
}
/* send transaction txend packet */
if (seqno > 0 || type_filter != NO_FILTER) {
status_end.header.type = ALFRED_STATUS_TXEND;
status_end.header.version = ALFRED_VERSION;
length = sizeof(status_end) - sizeof(status_end.header);
status_end.header.length = htons(length);
status_end.tx.id = tx_id;
status_end.tx.seqno = htons(seqno);
send_alfred_packet(globals, interface, destination, &status_end,
sizeof(status_end));
}
return 0;
}
int sync_data(struct globals *globals)
{
struct hash_it_t *hashit = NULL;
struct interface *interface;
/* send local data and data from our clients to (all) other servers */
list_for_each_entry(interface, &globals->interfaces, list) {
while (NULL != (hashit = hash_iterate(interface->server_hash,
hashit))) {
struct server *server = hashit->bucket->data;
push_data(globals, interface, &server->address,
SOURCE_FIRST_HAND, NO_FILTER,
get_random_id());
}
}
return 0;
}
int push_local_data(struct globals *globals)
{
struct interface *interface;
/* no server - yet */
if (!globals->best_server)
return -1;
list_for_each_entry(interface, &globals->interfaces, list) {
push_data(globals, interface, &globals->best_server->address,
SOURCE_LOCAL, NO_FILTER, get_random_id());
}
return 0;
}
ssize_t send_alfred_packet(struct globals *globals, struct interface *interface,
const alfred_addr *dest, void *buf, int length)
{
ssize_t ret;
struct sockaddr *dest_addr;
struct sockaddr_in6 dest_addr6;
struct sockaddr_in dest_addr4;
socklen_t slen;
if (globals->ipv4mode) {
memset(&dest_addr4, 0, sizeof(dest_addr4));
dest_addr4.sin_family = AF_INET;
dest_addr4.sin_port = htons(ALFRED_PORT);
memcpy(&dest_addr4.sin_addr, &dest->ipv4, sizeof(dest->ipv4));
slen = sizeof(struct sockaddr_in);
dest_addr = (struct sockaddr *)&dest_addr4;
} else {
memset(&dest_addr6, 0, sizeof(dest_addr6));
dest_addr6.sin6_family = AF_INET6;
dest_addr6.sin6_port = htons(ALFRED_PORT);
dest_addr6.sin6_scope_id = interface->scope_id;
memcpy(&dest_addr6.sin6_addr, &dest->ipv6, sizeof(dest->ipv6));
slen = sizeof(struct sockaddr_in6);
dest_addr = (struct sockaddr *)&dest_addr6;
}
if (interface->netsock < 0)
return 0;
ret = sendto(interface->netsock, buf, length, 0, dest_addr, slen);
if (ret == -EPERM) {
perror("Error during sent");
close(interface->netsock);
close(interface->netsock_mcast);
interface->netsock = -1;
interface->netsock_mcast = -1;
}
return ret;
}
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