controller-legacy/handlers/discovery.c

#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <uuid/uuid.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>

#include <logger.h>
#include <handlers.h>
#include <helpers.h>
#include <binn.h>
#include <enums.h>

void
handler_discovery(int fd, controller_t *controller)
{
    ssize_t bytes_transferred;
    uint16_t discovery_answer_port;
    struct sockaddr_in si_other;
    socklen_t slen = sizeof(si_other);

    if((bytes_transferred = recvfrom(fd, &discovery_answer_port, sizeof(discovery_answer_port), 0, (struct sockaddr *) &si_other, &slen)) <= 0)
    {
        LOG_ERROR("received invalid discovery from %s", inet_ntoa(si_other.sin_addr));
        return;
    }
    LOG_INFO("received discovery from %s:%d", inet_ntoa(si_other.sin_addr), discovery_answer_port);

    if(discovery_answer_port == 0)
    {
        LOG_ERROR("invalid port received");
        return;
    }

    binn *map = binn_map();

    binn_map_set_blob(map, DISCOVERY_MAPPING_ID, &controller->id, sizeof(uuid_t));
    binn_map_set_str(map, DISCOVERY_MAPPING_NAME, controller->name);
    binn_map_set_uint32(map, DISCOVERY_MAPPING_COMMAND_PORT, controller->command_port);
    binn_map_set_uint8(map, DISCOVERY_MAPPING_RELAY_COUNT, controller->relay_count);

    void *payload = binn_ptr(map);
    size_t payload_size = binn_size(map);

    int fd_answer = helper_connect_tcp_server(inet_ntoa(si_other.sin_addr), discovery_answer_port);
    if(fd_answer == -1)
    {
        LOG_ERROR("error during connecting");
        binn_free(map);
        return;
    }

    if((bytes_transferred = send(fd_answer, &payload_size, sizeof(payload_size), 0)) <= 0)
    {
        LOG_ERROR("error during sending");
        binn_free(map);
        return;
    }
    if((bytes_transferred = send(fd_answer, payload, payload_size, 0)) <= 0)
    {
        LOG_ERROR("error during sending");
        binn_free(map);
        return;
    }

    close(fd_answer);
}