diff --git a/src/client.c b/src/client.c
index b642bc2..fc4409e 100644
--- a/src/client.c
+++ b/src/client.c
@@ -7,7 +7,6 @@
 #include <string.h>
 #include <unistd.h>
 
-// TODO: синхронизовать c C++
 void process_client_command(char *line, session *sess, server_data_t *s_d) {
   char arg_1[32];
   char arg_2[32];
diff --git a/src/db.c b/src/db.c
index b5dc93e..63917de 100644
--- a/src/db.c
+++ b/src/db.c
@@ -10,6 +10,8 @@
 
 #define UNUSED(x) (void)(x)
 #define Q_LEN 128
+#define BIN 1
+#define TEXT 0
 
 static PGconn *conn = NULL;
 static PGresult *res = NULL;
@@ -91,7 +93,7 @@ int init_db_connection() {
   return exit_query(0);
 }
 
-int db_user_auth(i_auth_t *credentials, o_auth_t *response) {
+int32_t db_user_auth(i_auth_t *credentials, o_auth_t *response) {
   const char *paramValues[1];
   paramValues[0] = credentials->name;
 
@@ -108,13 +110,38 @@ int db_user_auth(i_auth_t *credentials, o_auth_t *response) {
   if (!strcmp(pass, credentials->pass)) {
     response->privileges = PQgetvalue(res, 0, 3)[0];
     response->uid = atoi(PQgetvalue(res, 0, 0));
+    clearRes();
+    char u_buf[128];
+    sprintf(u_buf, "UPDATE users SET last_login = NOW() WHERE id = %u",
+            response->uid);
+    res = PQexec(conn, u_buf);
+    if (PQresultStatus(res) != PGRES_TUPLES_OK && !PQntuples(res))
+      return exit_query(3);
     return exit_query(0);
   }
   return exit_query(2);
 }
 
-#define BIN 1
-#define TEXT 0
+int32_t db_user_create(i_db_user_create *args) {
+  const char *paramValues[3];
+  paramValues[0] = args->uname;
+  paramValues[1] = args->pass;
+  paramValues[2] = args->email;
+  uint32_t ret_value;
+
+  res = PQexecParams(
+      conn,
+      "INSERT INTO users (username, password, email, privileges, created_at, last_login)"
+      " VALUES ($1, $2, $3, 1, NOW(), NOW()) RETURNING id",
+      3, NULL, paramValues, NULL, NULL, TEXT);
+
+  if (PQresultStatus(res) != PGRES_TUPLES_OK && !PQntuples(res))
+    return exit_query(-1);
+
+  ret_value = atoi(PQgetvalue(res, 0, 0));
+  clearRes();
+  return ret_value;
+}
 
 int32_t db_save_file(session *s) {
   const char *paramValues[6];
@@ -189,10 +216,11 @@ s_file_t *db_get_file(i_get_file_db *arg) {
 
   paramValues[0] = value;
 
-  sprintf(query,
-          "SELECT files.id, user_id, name, size, description, permissions, hash "
-          "FROM files JOIN users ON user_id = users.id WHERE files.%s = $1%n",
-          s_field, &q_len);
+  sprintf(
+      query,
+      "SELECT files.id, user_id, name, size, description, permissions, hash "
+      "FROM files JOIN users ON user_id = users.id WHERE files.%s = $1%n",
+      s_field, &q_len);
 
   res = PQexecParams(conn, query, 1, NULL, paramValues, NULL, NULL, TEXT);
 
@@ -303,7 +331,7 @@ uint64_t db_get_files_data(i_get_files_db *arg, fl_t **fl_start,
   clearRes();
 
   res = PQexec(conn, "SELECT COUNT(id) "
-                     "FROM files "); // TODO: finish
+                     "FROM files ");
 
   if (PQresultStatus(res) != PGRES_TUPLES_OK && !PQntuples(res))
     return exit_query_2(0);
diff --git a/src/db.h b/src/db.h
index 19ba890..960f09f 100644
--- a/src/db.h
+++ b/src/db.h
@@ -20,7 +20,7 @@ typedef struct {
 typedef struct {
   uint32_t id;
   uint32_t user_id;
-  char name[64];
+  char name[FILE_NAME_LEN];
 } i_get_file_db;
 
 enum sort_direction { ASC, DESC };
@@ -28,17 +28,24 @@ enum sort_by { ID, NAME, CREATED_AT, USER_ID };
 
 typedef struct {
   uint32_t user_id; // TODO: implement
-  char name[12]; // TODO: implement
+  char name[FILE_NAME_LEN];    // TODO: implement
   uint32_t limit;
   uint32_t offset;
   enum sort_by sort_by;
   enum sort_direction sort_direction;
 } i_get_files_db;
 
+typedef struct {
+  char uname[UNAME_LEN];
+  char pass[PASS_LEN];
+  char email[EMAIL_LEN];
+} i_db_user_create;
+
 int32_t init_db_connection();
 int32_t db_save_file(session *s);
 int32_t db_user_auth(i_auth_t *credentials, o_auth_t *response);
 s_file_t *db_get_file(i_get_file_db *arg);
 uint64_t db_get_files_data(i_get_files_db *arg, fl_t **fl_start,
                            uint64_t *full_count);
+int32_t db_user_create(i_db_user_create *);
 #endif
\ No newline at end of file
diff --git a/src/deps.mk b/src/deps.mk
index e602749..8c8f8b1 100644
--- a/src/deps.mk
+++ b/src/deps.mk
@@ -1,9 +1,10 @@
-client.o: src/client.c src/client.h src/main.h src/file_p.h src/session.h
-db.o: src/db.c src/db.h src/main.h
-file_p.o: src/file_p.c src/file_p.h src/main.h src/db.h \
+client.o: src/client.c src/client.h src/main.h src/types.h src/file_p.h \
+ src/session.h
+db.o: src/db.c src/db.h src/main.h src/types.h
+file_p.o: src/file_p.c src/file_p.h src/main.h src/types.h src/db.h \
  src/libs/murmur3/murmur3.h src/session.h
-main.o: src/main.c src/main.h src/server.h src/db.h
-server.o: src/server.c src/main.h src/session.h src/user.h
-session.o: src/session.c src/session.h src/main.h src/client.h src/db.h \
- src/file_p.h src/user.h
-user.o: src/user.c src/main.h src/session.h src/db.h
+main.o: src/main.c src/main.h src/types.h src/server.h src/db.h
+server.o: src/server.c src/main.h src/types.h src/session.h src/user.h
+session.o: src/session.c src/session.h src/main.h src/types.h \
+ src/client.h src/db.h src/file_p.h src/user.h
+user.o: src/user.c src/db.h src/main.h src/types.h src/session.h
diff --git a/src/main.h b/src/main.h
index e559fff..9163b47 100644
--- a/src/main.h
+++ b/src/main.h
@@ -2,6 +2,7 @@
 #define MAIN_H
 #include <stddef.h>
 #include <stdint.h>
+#include "types.h"
 #define PORT 2000
 #define MAX_CONNECTIONS 1024
 #define INBUFSIZE 1024
@@ -24,7 +25,6 @@ enum sess_states {
   OP_WAIT,
   OP_UPLOAD,
   OP_UPLOAD_DESCRIPTION,
-  OP_REGISTER,
   ERR,
   FIN
 };
@@ -70,14 +70,14 @@ typedef struct session {
   unsigned long from_ip;
   unsigned short from_port;
   char buf[INBUFSIZE];
-  int buf_used;
+  uint32_t buf_used;
   enum sess_states state;
   enum error_reason reason;
   char privileges;
   char *uname;
   uint32_t uid;
-  int fd;
-  int sd; /* session descriptor */
+  int32_t fd;
+  int32_t sd; /* session descriptor */
   s_file_t *file;
   fl_t *fl_start;
   fl_t *fl_current;
diff --git a/src/session.c b/src/session.c
index f189d1d..54a8841 100644
--- a/src/session.c
+++ b/src/session.c
@@ -17,7 +17,7 @@
 
 session *make_new_session(int fd, struct sockaddr_in *from, char *wm);
 
-int accept_client(int ls, session *connections[], char *wm) {
+int32_t accept_client(int ls, session *connections[], char *wm) {
   int sd;
   struct sockaddr_in addr;
   socklen_t len = sizeof(addr);
@@ -83,7 +83,6 @@ int session_do_read(session *sess, char **read_str) {
   return 1;
 }
 
-// TODO: синхронизовать c C++
 int query_extract_from_buf(session *sess, char **output_line) {
   char *line;
   int pos = -1;
@@ -162,9 +161,6 @@ void perform_session_action(session *sess, char *line, server_data_t *s_d) {
       process_client_command(line, sess, s_d);
     }
     break;
-  case OP_REGISTER:
-    // TODO: 
-    break;
   }
   /* } */
 }
diff --git a/src/types.h b/src/types.h
new file mode 100644
index 0000000..61eb662
--- /dev/null
+++ b/src/types.h
@@ -0,0 +1,11 @@
+#ifndef D_TYPES_H
+#define D_TYPES_H
+
+/* user */
+#define EMAIL_LEN 256
+#define UNAME_LEN 51
+#define PASS_LEN 51
+/* file */
+#define FILE_NAME_LEN 65
+
+#endif
\ No newline at end of file
diff --git a/src/user.c b/src/user.c
index 643ff73..709c43b 100644
--- a/src/user.c
+++ b/src/user.c
@@ -1,24 +1,43 @@
+#include "db.h"
 #include "main.h"
 #include "session.h"
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "db.h"
 
-int process_user_name(char *uname, session *sess) {
-  if (!strncmp(uname, "exit", sizeof "exit")) {
+int32_t create_user(session *sess, char *line) {
+  i_db_user_create p;
+  uint32_t privileges;
+  uint32_t res;
+  if (sscanf(line, "register %s %s %s", p.uname, p.pass, p.email) == 3) {
+    res = db_user_create(&p);
+    if (res) {
+      sess->state = OP_WAIT;
+      sess->uname = malloc(strlen(p.uname));
+      strcpy(sess->uname, p.uname);
+      sess->uid = res;
+      sess->privileges = 1; // by default
+      session_send_string(sess, "ok");
+    }
+    return res;
+  };
+  return 0;
+}
+
+uint32_t process_user_name(char *line, session *sess) {
+  if (!strncmp(line, "exit", sizeof "exit")) {
     sess->state = ERR;
     sess->reason = EXIT;
     session_send_string(sess, "Bye!");
     return 1;
   }
 
-  if (!strncmp(uname, "register", sizeof "register"-1)) {
-    sess->state = OP_REGISTER;
-    return 2;
+  if (!strncmp(line, "register", sizeof "register" - 1)) {
+    return create_user(sess, line);
   }
 
-  if (!strncmp(uname, "anonymous", sizeof "anonymous")) {
+  if (!strncmp(line, "anonymous", sizeof "anonymous")) {
     sess->uname = malloc(sizeof "anonymous");
     strcpy(sess->uname, "anonymous");
     sess->state = OP_WAIT;
@@ -26,8 +45,8 @@ int process_user_name(char *uname, session *sess) {
     return 3;
   }
 
-  sess->uname = malloc(strlen(uname) + 1);
-  strcpy(sess->uname, uname);
+  sess->uname = malloc(strlen(line) + 1);
+  strcpy(sess->uname, line);
   sess->state = OP_LOGIN_PSS;
   session_send_string(sess, "password> ");
 
@@ -57,7 +76,6 @@ int login(session *sess, char *pass) {
   }
 }
 
-// TODO: синхронизовать c C++
 /* returns 1 if session needs to be closed, 0 - in the opposite case */
 int process_error(session *sess) {
   if (sess->state == ERR) {