12 files changed, 0 insertions, 785 deletions

diff --git a/Semestr 4/sieci/pracownia2/router/config.h b/Semestr 4/sieci/pracownia2/router/config.h
deleted file mode 100644
index f83c556..0000000
--- a/Semestr 4/sieci/pracownia2/router/config.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef CONFIG_H
-#define CONFIG_H
-
-#define SERVER_PORT 54321
-#define TURN_LEN_S 5
-
-#define INFINITY_DIST 16
-#define REACHABILITY_WAIT_TIME 3
-
-#define DV_DATAGRAM_LEN 9
-
-#define TURN_LEN_MS (1000 * TURN_LEN_S)
-#define TURN_LEN_US (1000000 * TURN_LEN_S)
-
-#endif
diff --git a/Semestr 4/sieci/pracownia2/router/dist_vector.c b/Semestr 4/sieci/pracownia2/router/dist_vector.c
deleted file mode 100644
index 74ae82e..0000000
--- a/Semestr 4/sieci/pracownia2/router/dist_vector.c
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include "dist_vector.h"
-#include <stdio.h>
-#include <time.h>
-#include <string.h>
-
-bool is_connected_directly(struct vector_item item) {
-  return item.is_connected_directly;
-}
-
-bool is_reachable(struct vector_item item) {
-  return (item.distance < INFINITY_DIST);
-}
-
-void init_dv(list_t *dv, int n_cnt, struct network_addr *neighbours) {
-  for (int i = 0; i < n_cnt; i++) {
-    struct vector_item new_item;
-    new_item.network = neighbours[i];
-    new_item.distance = INFINITY_DIST;
-    new_item.is_connected_directly = true;
-    insert(dv, &new_item, sizeof(new_item));
-  }
-}
-
-void update_dv_reachability(list_t *distance_vector) {
-  reset(distance_vector);
-  while (distance_vector->it != NULL) {
-    struct vector_item *current = (struct vector_item *)distance_vector->it->data;
-    if(++current->reachable > REACHABILITY_WAIT_TIME) {
-      if (current->distance >= INFINITY_DIST) {
-        if (!is_connected_directly(*current)) {
-          erase_it(distance_vector);
-        }
-      } else {
-        current->distance = INFINITY_DIST;
-        current->reachable = 0;
-      }
-    }
-    iterate(distance_vector);
-  }
-}
-
-void update_dv_new_item(list_t *distance_vector, struct vector_item new_item) {
-  bool new_entry = true;
-  reset(distance_vector);
-  while (distance_vector->it != NULL) {
-    struct vector_item *current = (struct vector_item *)distance_vector->it->data;
-
-    /* If the network is already in the distance vector, then we possibly want to change it:
-     *  - if the new item has better distance than the previous one, then we just want to change it no matter what,
-     *  - if the new item has the same via ip, then we want to check two things:
-     *     - if new item has infinity dist, then we want to set infinity (if it wasn't set, then we want to change reachable to 0)
-     *     - if new item has < inf dist, then we want to change reachable to 0 and set our dist accordingly.
-     *  - else we ignore the entry.
-     */
-    if (get_network_address(current->network).s_addr == get_network_address(new_item.network).s_addr) {
-      if (current->distance > new_item.distance) {
-        *current = new_item;
-        current->reachable = 0;
-      } else if(current->via_ip.s_addr == new_item.via_ip.s_addr) {
-        if (new_item.distance >= INFINITY_DIST) {
-          if (current->distance < INFINITY_DIST) {
-            current->distance = INFINITY_DIST;
-            current->reachable = 0;
-          }
-        } else {
-          current->distance = new_item.distance;
-          current->reachable = 0;
-        }
-      }
-      new_entry = false;
-    }
-
-    iterate(distance_vector);
-  }
-
-  if (new_entry && new_item.reachable < INFINITY_DIST) {
-    insert(distance_vector, &new_item, sizeof(new_item));
-  }
-}
-
-void print_dv(list_t *distance_vector) {
-  time_t rawtime;
-  struct tm * timeinfo;
-
-  time ( &rawtime );
-  timeinfo = localtime ( &rawtime );
-  char t[100];
-  strcpy(t, asctime(timeinfo));
-  t[strlen(t) - 1] = 0;
-  printf("Distance vector [%s]:\n", t);
-  reset(distance_vector);
-  while (distance_vector->it != NULL) {
-    char addr[20], via_addr[20];
-    struct vector_item current  = *(struct vector_item *)distance_vector->it->data;
-    struct in_addr net_addr     = get_network_address(current.network);
-    inet_ntop(AF_INET, &net_addr, addr, sizeof(addr));
-    printf("%s/%d ", addr, current.network.netmask);
-    
-    if (is_reachable(current))          printf("distance %d ", current.distance);
-    else                                printf("unreachable ");
-
-    inet_ntop(AF_INET, &current.via_ip, via_addr, sizeof(via_addr));
-    if (is_connected_directly(current)) printf("connected directly\n");
-    else                                printf("via %s\n", via_addr);
-
-    iterate(distance_vector);
-  }
-  printf("\n");
-}
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/dist_vector.h b/Semestr 4/sieci/pracownia2/router/dist_vector.h
deleted file mode 100644
index 14159b4..0000000
--- a/Semestr 4/sieci/pracownia2/router/dist_vector.h
+++ /dev/null
@@ -1,36 +0,0 @@
-#ifndef DIST_VECTOR_H
-#define DIST_VECTOR_H
-
-#include "linked_list.h"
-#include "network_addr.h"
-#include "config.h"
-
-/* Item of the distance vector. 
- * If <<reachable>> is set to 0, then it means that the network is reachable.
- * If <<reachable>> has positive value, then it indicates that the network was
- * unreachable for <<reachable>> turns.
- */
-struct vector_item {
-  struct network_addr network;
-  struct in_addr      via_ip;
-  uint16_t            distance;
-  uint8_t             reachable;
-  bool                is_connected_directly;
-};
-
-/* Initis distance vector with given neighbours array. */
-void init_dv(list_t *dv, int n_cnt, struct network_addr *neighbours);
-
-/* Returns true if given distance vector item is connected directly, false otherwise. */
-bool is_connected_directly(struct vector_item item);
-
-/* Updates the distance vector. */
-void update_dv_new_item(list_t *distance_vector, struct vector_item new_item);
-
-/* Updates reachabilities. */
-void update_dv_reachability(list_t *distance_vector);
-
-/* Print distance vector. */
-void print_dv(list_t *distance_vector);
-
-#endif
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/linked_list.c b/Semestr 4/sieci/pracownia2/router/linked_list.c
deleted file mode 100644
index 16113ac..0000000
--- a/Semestr 4/sieci/pracownia2/router/linked_list.c
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include "linked_list.h"
-#include <stdlib.h>
-#include <stdint.h>
-
-node_t *_next(node_t *node) {
-  return (node == NULL) ? NULL : node->next;
-}
-
-void _insert(node_t **head, void *data, size_t data_size) {
-  node_t *new_node = (node_t *)malloc(sizeof(node_t));
-  new_node->data = malloc(data_size);  
-  for (int i = 0; i < data_size; i++)
-    *(uint8_t *)(new_node->data + i) = *(uint8_t *)(data + i);
-  new_node->next = *head;
-  *head = new_node;
-}
-
-void _free_node(node_t *node) {
-  free(node->data);
-  free(node);
-}
-
-void _erase(node_t **head) {
-  node_t *next_node = _next(*head);
-  _free_node(*head);
-  *head = next_node;
-}
-
-void _free_list(node_t *head) {
-  if (head == NULL) return;
-  _free_list(head->next);
-  _free_node(head);
-}
-
-list_t create_list() {
-  list_t ret;
-  ret.head = NULL;
-  ret.it = NULL;
-  return ret;
-}
-
-void insert(list_t *list, void *data, size_t data_size) {
-  _insert(&list->head, data, data_size);
-}
-
-void erase(list_t *list) {
-  _erase(&list->head);
-}
-
-void erase_it(list_t *list) {
-  if(list->it == NULL) return;
-  if(list->prev_it == NULL) {
-    erase(list);
-    reset(list);
-    return;
-  }
-  list->prev_it->next = _next(list->it);
-  _free_node(list->it);
-  list->it = list->prev_it->next;
-}
-
-void iterate(list_t *list) {
-  list->prev_it = list->it;
-  list->it = _next(list->it);
-}
-
-void reset(list_t *list) {
-  list->prev_it = NULL;
-  list->it = list->head;
-}
-
-void free_list(list_t *list) {
-  _free_list(list->head);
-}
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/linked_list.h b/Semestr 4/sieci/pracownia2/router/linked_list.h
deleted file mode 100644
index 1574b2f..0000000
--- a/Semestr 4/sieci/pracownia2/router/linked_list.h
+++ /dev/null
@@ -1,42 +0,0 @@
-#ifndef LINKED_LIST_H
-#define LINKED_LIST_H
-
-#include <stddef.h>
-
-typedef struct node {
-  void *data;
-  struct node *next;
-} node_t;
-
-
-typedef struct list_t {
-  node_t *head;
-  node_t *it;
-  node_t *prev_it;
-} list_t;
-
-/* Creates an empty list. */
-list_t create_list();
-
-/* Insert a new node in the begining of a list. */
-void insert(list_t *list, void *data, size_t data_size);
-
-/* Erases first node from the list. */
-void erase(list_t *list);
-
-/* Erases element under iterator and sets iterator to the next one. */
-void erase_it(list_t *list);
-
-/* Moves iterator one step. */
-void iterate(list_t *list);
-
-/* Resets the iterator. 
- * Should execute the function after if you want to itarate unless you didnt insert or erase anything from the list. 
- */
-void reset(list_t *list);
-
-/* Deletes the whole list. */
-void free_list(list_t *list);
-
-
-#endif
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/makefile b/Semestr 4/sieci/pracownia2/router/makefile
deleted file mode 100644
index bf6a327..0000000
--- a/Semestr 4/sieci/pracownia2/router/makefile
+++ /dev/null
@@ -1,34 +0,0 @@
-CC		:= gcc
-CFLAGS		:= -O2 -std=gnu17 -Wall -Wall -Wno-unused-result
-TARGET		:= router
-TEST		:= test
-DEPS		:= config.h
-
-ODIR		:= obj
-_OBJ		:= router.o utils.o linked_list.o network_addr.o dist_vector.o
-OBJ		:= $(patsubst %,$(ODIR)/%,$(_OBJ))
-
-_TEST_OBJ := test.o linked_list.o
-TEST_OBJ  := $(patsubst %,$(ODIR)/%,$(_TEST_OBJ))
-
-
-all: $(TARGET)
-test: $(TEST)
-
-$(ODIR)/%.o: %.c $(DEPS)
-	$(CC) $(CFLAGS) -c -o $@ $<
-
-$(TARGET): $(OBJ)
-	$(CC) -o $@ $^ $(CFLAGS)
-
-$(TEST): $(TEST_OBJ)
-	$(CC) -o $@ $^ $(CFLAGS)
-
-clean:
-	rm -rf $(TARGET)
-	rm -rf test
-
-distclean:
-	rm -rf $(TARGET)
-	rm -rf test
-	rm -rf $(ODIR)/*.o
diff --git a/Semestr 4/sieci/pracownia2/router/network_addr.c b/Semestr 4/sieci/pracownia2/router/network_addr.c
deleted file mode 100644
index cac1060..0000000
--- a/Semestr 4/sieci/pracownia2/router/network_addr.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include "network_addr.h"
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-struct in_addr _get_broadcast_address(struct in_addr addr, uint16_t netmask) {
-  struct in_addr result = addr;
-  result.s_addr = ntohl(result.s_addr);
-  /* bitshift by more than 31 is UB */
-  if (netmask == 0) {
-    result.s_addr = -1;
-  }
-  else {
-    result.s_addr |= ((1 << (32 - netmask)) - 1);
-  }
-  result.s_addr = htonl(result.s_addr);
-
-  return result;
-}
-
-struct in_addr _get_network_address(struct in_addr addr, uint16_t netmask) {
-  struct in_addr result = addr;
-  result.s_addr = ntohl(result.s_addr);
-
-  if (netmask == 0) {
-    result.s_addr = 0;
-  }
-  else {
-    result.s_addr &= ~((1 << (32 - netmask)) - 1);
-  }
-  result.s_addr = htonl(result.s_addr);
-
-  return result;
-}
-
-struct in_addr get_broadcast_address(struct network_addr na) {
-  return _get_broadcast_address(na.addr, na.netmask);
-}
-
-struct in_addr get_network_address(struct network_addr na) {
-  return _get_network_address(na.addr, na.netmask);
-}
-
-void pretty_print_network(struct network_addr na) {
-  char ip_addr[20];
-  inet_ntop(AF_INET, &na.addr, ip_addr, sizeof(ip_addr));
-  printf("%s/%d\n", ip_addr, na.netmask);
-}
-
-struct network_addr stona(char *str) {
-  struct network_addr  result;
-  char                addr[20];
-  size_t              ip_preffix = strcspn(str, "/");
-  
-  strncpy(addr, str, ip_preffix);
-  addr[ip_preffix] = 0;
-  inet_pton(AF_INET, addr, &(result.addr));
-  result.netmask = atoi(str + ip_preffix + 1);
-  return result;
-}
diff --git a/Semestr 4/sieci/pracownia2/router/network_addr.h b/Semestr 4/sieci/pracownia2/router/network_addr.h
deleted file mode 100644
index 6347bbd..0000000
--- a/Semestr 4/sieci/pracownia2/router/network_addr.h
+++ /dev/null
@@ -1,28 +0,0 @@
-#ifndef ROUTER_ADDR_H
-#define ROUTER_ADDR_H
-
-#include <arpa/inet.h>
-#include <stdint.h>
-#include <stdbool.h>
-
-/* Network address with netmask. */
-struct network_addr {
-  struct in_addr  addr;
-  uint8_t         netmask;
-};
-
-typedef struct network_addr router_addr;
-
-/* Returns broadcast address of a given network. */
-struct in_addr get_broadcast_address(struct network_addr na);
-
-/* Returns network address of a given network. */
-struct in_addr get_network_address(struct network_addr na);
-
-/* Prints network_addr via stdio. */
-void pretty_print_network(struct network_addr na);
-
-/* Converts string of ip in CIDR notation with a netmask to network_addr. */
-struct network_addr stona(char *str);
-
-#endif
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/router.c b/Semestr 4/sieci/pracownia2/router/router.c
deleted file mode 100644
index b5e732c..0000000
--- a/Semestr 4/sieci/pracownia2/router/router.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include <stdio.h>
-#include <errno.h>
-#include <strings.h>
-#include <string.h>
-#include <netinet/ip.h>
-#include <arpa/inet.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <limits.h>
-#include "network_addr.h"
-#include "utils.h"
-#include "dist_vector.h"
-
-uint16_t read_configuration(struct network_addr** networks, uint16_t **dists) {
-  uint16_t n;
-  scanf("%hd", &n);
-  *networks = malloc(n * sizeof(struct network_addr));
-  *dists    = malloc(n * sizeof(uint16_t));
-  for (int i = 0; i < n; i++) {
-    char addr[20];
-    char _dist[10];
-    uint16_t dist;
-    scanf(" %s %s %hd", addr, _dist, &dist);
-    (*networks)[i] = stona(addr);
-    (*dists)[i] = dist;
-  }
-  return n;
-}
-
-void router_loop(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists) {
-  list_t dv = create_list();
-  init_dv(&dv, networks_number, networks);
-
-  printf("Starting the router loop...\n");
-  for (;;) {
-    print_dv(&dv);
-    propagate_distance_vector(sockfd, networks_number, networks, dists, &dv);
-    listen_for_routers(sockfd, TURN_LEN_MS, networks_number, networks, dists, &dv);
-  }
-}
-
-int main() {
-  struct network_addr* networks;
-  uint16_t *dists;
-  int n = read_configuration(&networks, &dists);
-  int sockfd = get_socket();
-  bind_to_port(sockfd, SERVER_PORT);
-
-  router_loop(sockfd, n, networks, dists);
-
-  close(sockfd);
-  free(networks);
-  free(dists);
-}
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/test.c b/Semestr 4/sieci/pracownia2/router/test.c
deleted file mode 100644
index 958ff36..0000000
--- a/Semestr 4/sieci/pracownia2/router/test.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include "linked_list.h"
-#include <stdlib.h>
-#include <stdio.h>
-
-/* Prints the list of ints to stdio */
-void print_list(list_t list) {
-  printf("List: ");
-  reset(&list);
-  while (list.it != NULL) {
-    printf("%d, ", *(int *)(list.it->data));
-    iterate(&list);
-  }
-  printf("\n");
-  reset(&list);
-}
-
-int main() {
-  int n;
-  scanf("%d", &n);
-  list_t list = create_list();
-
-  for (int i = 0; i < n; i++) {
-    int t;
-    scanf("%d", &t);
-    // insert
-    if (t == 0) {
-      int val = 0;
-      scanf("%d", &val);
-      insert(&list, &val, sizeof(int));
-      reset(&list);
-    }
-    if (t == 1) {
-      iterate(&list);
-      if (list.it != NULL)
-        printf("it: %d\n", *(int *)list.it->data);
-      else printf("End of list.\n");
-    }
-    if (t == 2) {
-      erase_it(&list);
-    }
-    if (t == 3) {
-      print_list(list);
-    }
-  }
-
-  free_list(&list);
-}
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/utils.c b/Semestr 4/sieci/pracownia2/router/utils.c
deleted file mode 100644
index 0c0cae5..0000000
--- a/Semestr 4/sieci/pracownia2/router/utils.c
+++ /dev/null
@@ -1,208 +0,0 @@
-/*
- *  Program:  router
- *  Autor:    Franciszek Malinka, 316093
- */
-
-#include "utils.h"
-#include <arpa/inet.h>
-#include <netinet/ip.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-#include <limits.h>
-
-int get_socket() {
-  int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
-  if (sockfd < 0) {
-    fprintf(stderr, "Socket error: %s\n", strerror(errno));
-    exit(EXIT_FAILURE);
-  }
-  return sockfd;
-}
-
-void bind_to_port(int sockfd, uint16_t port) {
-  struct sockaddr_in server_address;
-  bzero(&server_address, sizeof(server_address));
-  server_address.sin_family       = AF_INET;
-  server_address.sin_port         = htons(port);
-  server_address.sin_addr.s_addr  = htonl(INADDR_ANY);
-  
-  if (bind(sockfd, (struct sockaddr*)&server_address, sizeof(server_address)) < 0) {
-    fprintf(stderr, "Bind error: %s\n", strerror(errno));
-    exit(EXIT_FAILURE);
-  }
-  
-  int broadcastPermission = 1;
-  setsockopt (sockfd, SOL_SOCKET, SO_BROADCAST, (void *)&broadcastPermission, sizeof(broadcastPermission));
-}
-
-long get_time_interval(struct timespec start, struct timespec finish) {
-  return S_TO_MS(finish.tv_sec - start.tv_sec) + NS_TO_MS(finish.tv_nsec - start.tv_nsec);
-}
-
-int poll_socket_modify_timeout(int sockfd, int *timeout) {
-  if (*timeout < 0) {
-    *timeout = 0;
-    return 0;
-  }
-
-  struct pollfd fds;
-  struct timespec start;
-  struct timespec finish;
-  
-  fds.fd = sockfd;
-  fds.events = POLLIN;
-  fds.revents = 0;
-  
-  clock_gettime(CLOCK_REALTIME, &start);
-  int result = poll(&fds, 1, *timeout);
-  clock_gettime(CLOCK_REALTIME, &finish);
-  
-  if (result == -1) {
-    fprintf(stderr, "poll error: %s\n", strerror(errno));
-    exit(EXIT_FAILURE);
-  }
-  if (result == 0) {
-    *timeout = 0;
-    return 0;
-  }
-
-  *timeout -= get_time_interval(start, finish);
-  return result;
-}   
-
-size_t send_message(int sockfd, char *buffer, int buffer_len, struct in_addr network) {
-  struct sockaddr_in network_address;
-  bzero (&network_address, sizeof(network_address));
-  network_address.sin_family       = AF_INET;
-  network_address.sin_port         = htons(SERVER_PORT);
-  network_address.sin_addr         = network;
-  
-  return sendto(sockfd, buffer, buffer_len, 0, (struct sockaddr*) &network_address, sizeof(network_address));
-}
-
-size_t recv_message(int sockfd, char *buffer, struct sockaddr_in *sender) {
-  socklen_t sender_len = sizeof(*sender);
-  for (int i = 0; i < DV_DATAGRAM_LEN; i++) buffer[i] = 0;
-  size_t datagram_len = recvfrom(sockfd, buffer, IP_MAXPACKET, 0,
-    (struct sockaddr*)sender, &sender_len);
-  if (datagram_len < 0) {
-    fprintf(stderr, "recvfrom error: %s\n", strerror(errno));
-    exit(EXIT_FAILURE);
-  }
-  
-  return datagram_len;
-}
-
-struct vector_item parse_message(char *buffer, struct sockaddr_in *sender) {
-  struct vector_item res;
-  uint32_t ip_addr  = *(uint32_t *)buffer;
-  uint32_t dist     = *(uint32_t *)(buffer + 5);
-  dist              = ntohl(dist);
-
-  res.network.addr.s_addr   = ip_addr;
-  res.network.netmask       = buffer[4];
-  res.is_connected_directly = true;
-  res.via_ip                = sender->sin_addr;
-  res.distance              = (dist < INFINITY_DIST ? dist : INFINITY_DIST);
-  res.reachable             = 0;
-
-  char addr[20];
-  inet_ntop(AF_INET, &res.network.addr, addr, sizeof(addr));
-  char via[20];
-  inet_ntop(AF_INET, &sender->sin_addr, via, sizeof(via));
-  return res;
-}
-
-void _get_message(struct vector_item item, char *message) {
-  *(uint32_t *)message  = item.network.addr.s_addr;
-  message[4]            = item.network.netmask;
-  uint32_t distance     = htonl(item.distance >= INFINITY_DIST ? INT_MAX : item.distance);
-  for (int i = 0; i < 4; i++) {
-    *(message + 5 + i) = *((char *)(&distance) + i); 
-  }
-}
-
-int _send_item(int sockfd, struct network_addr network, struct vector_item item) {
-  char message[DV_DATAGRAM_LEN + 1];
-  _get_message(item, message);
-  message[DV_DATAGRAM_LEN] = 0;
-  ssize_t message_len = DV_DATAGRAM_LEN;
-
-  struct in_addr na = get_broadcast_address(network);
-  
-  char addr[20];
-  inet_ntop(AF_INET, &na, addr, sizeof(addr));
-
-  int result;
-  if ((result = send_message(sockfd, message, message_len, na)) != message_len) {
-    // fprintf(stderr, "sendto error: %s\n", strerror(errno));
-  }
-  return result;
-}
-
-void listen_for_routers(int sockfd, int timeout, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv) {
-  char buffer[IP_MAXPACKET + 1];
-  struct sockaddr_in sender;
-
-  while (poll_socket_modify_timeout(sockfd, &timeout)) {
-    recv_message(sockfd, buffer, &sender);
-    struct vector_item new_item = parse_message(buffer, &sender);
-
-    bool is_neighbour = false;
-    for (int i = 0; i < networks_number; i++) {
-      if (is_from_network(sender.sin_addr, networks[i])) {
-        is_neighbour = true;
-        break;
-      }
-    }
-
-    /* Shouldn't happen, just in case. */
-    if (!is_neighbour) {
-      char addr[20];
-      inet_ntop(AF_INET, &sender.sin_addr, addr, sizeof(addr));
-      fprintf(stderr, "Received datagram from %s, he is in none of my networks, ignoring\n. Maybe his VM routing table is configured incorrectly?\n", addr);
-      continue;
-    }
-
-    if (!is_from_network(sender.sin_addr, new_item.network)) {
-      new_item.is_connected_directly = false;
-
-      for (int i = 0; i < networks_number; i++) {
-          if (is_from_network(sender.sin_addr, networks[i])) {
-          new_item.distance += dists[i];
-          break;
-        }
-      }
-    } 
-
-    update_dv_new_item(dv, new_item);
-  }
-  update_dv_reachability(dv);
-}
-
-void propagate_distance_vector(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv) {
-  for (int i = 0; i < networks_number; i++) {
-    reset(dv);
-    while (dv->it != NULL) {
-      struct vector_item data = *(struct vector_item *)dv->it->data;
-      if (!(get_network_address(data.network).s_addr == get_network_address(networks[i]).s_addr) && data.reachable <= REACHABILITY_WAIT_TIME) {
-        _send_item(sockfd, networks[i], data);
-      }
-      iterate(dv);
-    }
-
-    struct vector_item self_item;
-    self_item.distance = dists[i];
-    self_item.network = networks[i];    
-    _send_item(sockfd, networks[i], self_item);
-  }
-}
-
-bool is_from_network(struct in_addr ip_addr, struct network_addr network) {
-  struct network_addr temp;
-  temp.addr= ip_addr;
-  temp.netmask = network.netmask;
-  return (get_network_address(temp).s_addr == get_network_address(network).s_addr);
-}
\ No newline at end of file
diff --git a/Semestr 4/sieci/pracownia2/router/utils.h b/Semestr 4/sieci/pracownia2/router/utils.h
deleted file mode 100644
index edf90d0..0000000
--- a/Semestr 4/sieci/pracownia2/router/utils.h
+++ /dev/null
@@ -1,52 +0,0 @@
-#ifndef UTILS_H
-#define UTILS_H
-#define UTILS_H
-
-#include "config.h"
-#include <stdint.h>
-#include <time.h>
-#include <poll.h>
-#include "network_addr.h"
-#include "dist_vector.h"
-
-#define NS_TO_MS(X) ((long)(X) / (long)1000000)
-#define S_TO_MS(X) ((long)(X) * (long)1000)
-
-/* Returns a UDP socket. */
-int get_socket();
-
-/* Binds socket to given port and set the broadcast permission. */
-void bind_to_port(int sockfd, uint16_t port);
-
-/* Computes the time elapsed between start and finish in miliseconds. */
-long get_time_interval(struct timespec start, struct timespec finish);
-
-/* Polls given socket with given timeout and changes the timeout accordingly. */
-int poll_socket_modify_timeout(int sockfd, int *timeout);
-
-/* For debug purposes only. Recieves and prints UDP message. */
-void recv_and_print(int sockfd, int networks_number, struct network_addr *networks);
-
-/* Sends message in buffer of length buffer_len to addr through given socket. 
- * IT DOES NOT TERMINATE THE PROGRAM IF SENDTO RETURNS ANY ERRORS! 
- * One must handle the errors on their own. 
- */  
-size_t send_message(int sockfd, char *buffer, int buffer_len, struct in_addr addr);
-
-/* Receive message and write it to buffer. */
-size_t recv_message(int sockfd, char *buffer, struct sockaddr_in *sender);
-
-/* Parse datagram into a vector item. */
-struct vector_item parse_message(char *buffer, struct sockaddr_in *sender);
-
-/* Listnes for routers for timeout ms. */
-void listen_for_routers(int sockfd, int timeout, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv);
-
-/* Propagates dv to all connected networks. */
-void propagate_distance_vector(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv);
-
-/* Checks if given address is in network range. */
-bool is_from_network(struct in_addr ip_addr, struct network_addr network);
- 
-
-#endif
\ No newline at end of file