--- bsdping.c.orig	Thu Nov 26 10:08:06 1998
+++ ping.c	Thu Nov 26 10:04:31 1998
@@ -69,6 +69,14 @@
  *	This program has to run SUID to ROOT to access the ICMP socket.
  */
 
+/*
+ * BSD patch by Harl to pick up ECHO_REPLY from firewalls that is otherwise
+ * not reported.
+ *
+ * Anti-copyright (1998) Steal what the fuck you want.
+ *
+ */
+
 #include <sys/param.h>
 #include <sys/queue.h>
 #include <sys/socket.h>
@@ -149,6 +157,7 @@
 char DOT = '.';
 char *hostname;
 int ident;			/* process id to identify our packets */
+static struct in_addr dest_addr_store;
 
 /* counters */
 long npackets;			/* max packets to transmit */
@@ -334,6 +343,8 @@
 		hostname = hnamebuf;
 	}
 
+	dest_addr_store = to->sin_addr;
+	
 	if (options & F_FLOOD && options & F_INTERVAL)
 		errx(1, "-f and -i options are incompatible");
 
@@ -640,8 +651,18 @@
 
 	(void)gettimeofday(&tv, (struct timezone *)NULL);
 
+
 	/* Check the IP header */
 	ip = (struct ip *)buf;
+
+        /* Check reply is from pinged host */
+        if (memcmp(&dest_addr_store, &ip->ip_src.s_addr, sizeof(struct in_addr))) {
+		printf("Reply not from target. Source %s",inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr));
+		(void)printf(" ttl=%d", ip->ip_ttl);
+		if (timing)
+			(void)printf(" time=%ld.%ld ms\n", triptime/10, triptime%10);
+	}
+
 	hlen = ip->ip_hl << 2;
 	if (cc < hlen + ICMP_MINLEN) {
 		if (options & F_VERBOSE)
@@ -1280,3 +1301,5 @@
 	    " [-w maxwait] host\n");
 	exit(1);
 }
+
+