first draft

gethostname.c

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+/* 
+ * $smu-mark$ 
+ * $name: gethostname.c$ 
+ * $author: Salvatore Sanfilippo <antirez@invece.org>$ 
+ * $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$ 
+ * $license: This software is under GPL version 2 of license$ 
+ * $date: Fri Nov  5 11:55:47 MET 1999$ 
+ * $rev: 8$ 
+ */ 
+
+#include <stdio.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "hping2.h"
+#include "globals.h"
+
+size_t strlcpy(char *dst, const char *src, size_t siz);
+
+char *get_hostname(const char* addr)
+{
+	static char answer[1024];
+	static char lastreq[1024] = {'\0'};	/* last request */
+	struct hostent *he;
+	struct in6_addr naddr6;
+	static char *last_answerp = NULL;
+
+	printf(" get hostname..."); fflush(stdout);
+	printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+		"               "
+		"\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+
+	if (!strcmp(addr, lastreq))
+		return last_answerp;
+
+	strlcpy(lastreq, addr, 1024);
+	inet_pton(opt_af, addr, &naddr6);
+	he = gethostbyaddr((char*)&naddr6, sizeof(naddr6), opt_af);
+
+	if (he == NULL) {
+		last_answerp = NULL;
+		return NULL;
+	}
+
+	strlcpy(answer, he->h_name, 1024);
+	last_answerp = answer;
+
+	return answer;
+}
+