From c5fcf7179a83ef65c86c6a4a390029149e518649 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Tue, 5 Oct 2021 21:49:54 +0200
Subject: Duzy commit ze smieciami

---
 .../pracownia2/franciszek_malinka/network_addr.c   | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 semestr-4/sieci/pracownia2/franciszek_malinka/network_addr.c

(limited to 'semestr-4/sieci/pracownia2/franciszek_malinka/network_addr.c')

diff --git a/semestr-4/sieci/pracownia2/franciszek_malinka/network_addr.c b/semestr-4/sieci/pracownia2/franciszek_malinka/network_addr.c
new file mode 100644
index 0000000..cac1060
--- /dev/null
+++ b/semestr-4/sieci/pracownia2/franciszek_malinka/network_addr.c
@@ -0,0 +1,65 @@
+/*
+ *  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;
+}
-- 
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