add: version.h

fix: refactor

src/handlers/discovery.c

@@ -0,0 +1,89 @@
+#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 <mpack.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\n", inet_ntoa(si_other.sin_addr));
+        return;
+    }
+    LOG_INFO("received discovery from %s:%d\n", inet_ntoa(si_other.sin_addr), discovery_answer_port);
+
+    if(discovery_answer_port == 0)
+    {
+        LOG_ERROR("invalid port received\n");
+        return;
+    }
+
+    char* payload;
+    size_t payload_size;
+    mpack_writer_t writer;
+    mpack_writer_init_growable(&writer, &payload, &payload_size);
+
+    mpack_start_map(&writer, 4);
+    mpack_write_uint(&writer, DISCOVERY_MAPPING_ID);
+    mpack_write_bin(&writer, (char*)controller->id, sizeof(uuid_t));
+    mpack_write_uint(&writer, DISCOVERY_MAPPING_COMMAND_PORT);
+    mpack_write_u16(&writer, controller->command_port);
+    mpack_write_uint(&writer, DISCOVERY_MAPPING_RELAY_COUNT);
+    mpack_write_u8(&writer, controller->relay_count);
+    mpack_write_uint(&writer, DISCOVERY_MAPPING_NAME);
+    mpack_write_cstr(&writer, controller->name);
+    mpack_finish_map(&writer);
+
+    // finish writing
+    if(mpack_writer_destroy(&writer) != mpack_ok)
+    {
+        LOG_ERROR("error writing discovery answer payload\n");
+        return;
+
+    }
+
+    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\n");
+        free(payload);
+        return;
+    }
+
+    if((bytes_transferred = send(fd_answer, &payload_size, sizeof(payload_size), 0)) <= 0)
+    {
+        LOG_ERROR("error during sending\n");
+        free(payload);
+        close(fd_answer);
+        return;
+    }
+    if((bytes_transferred = send(fd_answer, payload, payload_size, 0)) <= 0)
+    {
+        LOG_ERROR("error during sending\n");
+        free(payload);
+        close(fd_answer);
+        return;
+    }
+
+    free(payload);
+    close(fd_answer);
+}