add: improved print

src/host.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <netinet/in.h>
+
+struct host {
+    char ip[INET_ADDRSTRLEN];
+    char *hostname;
+};

src/main.c

@@ -1,3 +1,5 @@
+#include "dns.h"
+#include "host.h"
 #include "packet.h"
 #include "print.h"
 #include <signal.h>
@@ -32,21 +34,21 @@ int main(int ac, char **av)
 {
     (void) ac;
     (void) av;
+    struct host hostname;
+
     size_t payload_size = 48;
     size_t packet_size = sizeof(struct icmphdr) + payload_size;
 
     signal(SIGINT, signal_handler);
 
-    char *ipstr = dns_lookup("google.com");
+    if (dns_lookup("localhost", hostname.ip))
-    if (ipstr == NULL)
         return 5;
 
     struct sockaddr_in dest;
 
     dest.sin_family = AF_INET;
     dest.sin_port = htons(0);       
-    inet_pton(AF_INET, ipstr, &dest.sin_addr);
+    inet_pton(AF_INET, hostname.ip, &dest.sin_addr);
-    free(ipstr);
 
     int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 
@@ -102,8 +104,9 @@ int main(int ac, char **av)
         }
         while (len == packet_size && packet_check(buffer, packet_size) == 0 && packet_compare(packet, buffer, packet_size) == 0);
 
-        double time_interval = ((stop.tv_sec - start.tv_sec) * 1000 + (stop.tv_usec - start.tv_usec)) / 1000;
+        double time_interval = ((stop.tv_sec - start.tv_sec) * 1000 + ((double)stop.tv_usec - (double) start.tv_usec)  / 1000);
-        printf("icmp reply received %fms\n", time_interval);
+        struct icmphdr *hdr = (struct icmphdr *) packet;
+        printf("%zu bytes from %p (%s): icmp_seq=%d, ttl=%u, time=%fms\n", payload_size, NULL, hostname.ip, htons(hdr->un.echo.sequence), 116, time_interval);
         
         sleep(1);