add: print

src/interval.c

@@ -0,0 +1,11 @@
+#include <bits/types/struct_timeval.h>
+
+double interval_to_ms(struct timeval const *t)
+{
+    return (double)t->tv_sec * 1000.0 + (double)t->tv_usec / 1000.0;
+}
+
+double get_interval(struct timeval const *start, struct timeval const *stop)
+{
+    return interval_to_ms(stop) - interval_to_ms(start);
+}

src/interval.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <sys/time.h>
+
+double get_interval(struct timeval const *start, struct timeval const *stop);

src/main.c

@@ -4,6 +4,8 @@
 #include "parsing.h"
 #include "print.h"
 #include "setting.h"
+#include "statistics.h"
+
 #include <netinet/ip.h>
 #include <signal.h>
 #include <stddef.h>
@@ -100,6 +102,7 @@ static int get_setting(char * const *av, struct setting *setting)
 int main(int ac, char **av)
 {
     (void) ac;
+    struct statistics stats;
     struct setting settings;
 
     if (get_setting(av + 1, &settings))
@@ -116,7 +119,6 @@ int main(int ac, char **av)
     settings.dest.ip.sin_port = htons(0);       
     inet_pton(AF_INET, settings.dest.ipstr, &settings.dest.ip.sin_addr);
 
-
     dns_reverse_lookup(&settings.dest);
 
     int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
@@ -146,6 +148,9 @@ int main(int ac, char **av)
     struct sockaddr_in sender;
     socklen_t len = sizeof(sender); 
 
+    bzero(&stats, sizeof(struct statistics));
+    print_header(&settings);
+
     while (loop) {
 
         struct timeval stop, start;
@@ -159,6 +164,8 @@ int main(int ac, char **av)
             return 2;
         }
 
+        stats.packets_sent++;
+
         do
         {
             if (recvfrom(sockfd, buffer, packet_size, 0, (struct sockaddr *) &sender, &len) < 0)
@@ -173,9 +180,11 @@ 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 + ((double)stop.tv_usec - (double) start.tv_usec)  / 1000);
+        stats.packets_received++;
+
         struct icmphdr *hdr = (struct icmphdr *) packet;
-        printf("%zu bytes from %s (%s): icmp_seq=%d, ttl=%u, time=%fms\n", packet_size, settings.dest.reverse_dns, settings.dest.ipstr, htons(hdr->un.echo.sequence), 116, time_interval);
+
+        print_ping(&settings, hdr, &start, &stop);
         
         sleep(1);
 
@@ -186,6 +195,9 @@ int main(int ac, char **av)
             free(packet);
         }
     }
+
     free(packet);
     free(buffer);
+
+    print_statistics(&stats, &settings);
 }

src/print.c

@@ -1,7 +1,15 @@
 
 
+#include "interval.h"
+#include "setting.h"
+#include "statistics.h"
+#include <bits/types/struct_timeval.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <sys/types.h>
 #include <unistd.h>
 
 void print_err(const char *format, ...)
@@ -14,3 +22,41 @@ void print_err(const char *format, ...)
     va_end(args);
     write(2, "\n", 1);
 }
+
+void print_header(const struct setting *settings)
+{
+    printf("PING %s (%s) %zu(%zu) bytes of data",
+        settings->dest.hostname,
+        settings->dest.ipstr,
+        settings->payload_size,
+        settings->payload_size + sizeof(struct icmphdr) + sizeof(struct iphdr)
+    );
+    if (settings->verbose)
+    {
+        unsigned short pid = getpid();
+        printf(", id 0x%x = %d", htons(getpid()), pid);
+    }
+    printf("\n");
+}
+
+void print_statistics(struct statistics const *stats, struct setting const *settings)
+{
+    printf("--- %s ping statistics ---\n", settings->dest.hostname);
+    printf("%zu packets transmitted, %zu packets received, %.3f%% packet loss\n",
+        stats->packets_sent,
+        stats->packets_received,
+        ((double) stats->packets_sent) * 100 / (double) stats->packets_received
+    );
+}
+
+void print_ping(const struct setting *settings, const struct icmphdr *header, const struct timeval *start, const struct timeval *stop)
+{
+
+    printf("%zu bytes from %s: icmp_seq=%d ttl=%zu time=%.3f ms\n",
+        settings->payload_size + sizeof(struct icmphdr),
+        settings->dest.ipstr,
+        htons(header->un.echo.sequence),
+        settings->ttl,
+        get_interval(start, stop)
+    );
+}

src/print.h

@@ -1,3 +1,12 @@
 #pragma once
 
+#include "setting.h"
+#include "statistics.h"
+#include <bits/types/struct_timeval.h>
+#include <netinet/ip_icmp.h>
+
 void print_err(const char *format, ...);
+
+void print_header(struct setting const *settings);
+void print_statistics(struct statistics const *stats, struct setting const *settings);
+void print_ping(struct setting const *settings, struct icmphdr const *header, struct timeval const *start, struct timeval const *stop);

src/statistics.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stddef.h>
+#include <sys/time.h>
+
+struct statistics {
+    size_t packets_sent;
+    size_t packets_received;
+};