1 files changed, 116 insertions, 0 deletions
diff --git a/nbase/getnameinfo.c b/nbase/getnameinfo.c
new file mode 100644
index 0000000..5261db0
--- /dev/null
+++ b/nbase/getnameinfo.c
@@ -0,0 +1,116 @@
+/***************************************************************************
+ * getnameinfo.c -- A **PARTIAL** implementation of the getnameinfo(3)     *
+ * host resolution call.  In particular, IPv6 is not supported and neither *
+ * are some of the flags.  Service "names" are always returned as decimal  *
+ * port numbers.                                                           *
+ *                                                                         *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+ * Project"). Nmap is also a registered trademark of the Nmap Project.
+ *
+ * This program is distributed under the terms of the Nmap Public Source
+ * License (NPSL). The exact license text applying to a particular Nmap
+ * release or source code control revision is contained in the LICENSE
+ * file distributed with that version of Nmap or source code control
+ * revision. More Nmap copyright/legal information is available from
+ * https://nmap.org/book/man-legal.html, and further information on the
+ * NPSL license itself can be found at https://nmap.org/npsl/ . This
+ * header summarizes some key points from the Nmap license, but is no
+ * substitute for the actual license text.
+ *
+ * Nmap is generally free for end users to download and use themselves,
+ * including commercial use. It is available from https://nmap.org.
+ *
+ * The Nmap license generally prohibits companies from using and
+ * redistributing Nmap in commercial products, but we sell a special Nmap
+ * OEM Edition with a more permissive license and special features for
+ * this purpose. See https://nmap.org/oem/
+ *
+ * If you have received a written Nmap license agreement or contract
+ * stating terms other than these (such as an Nmap OEM license), you may
+ * choose to use and redistribute Nmap under those terms instead.
+ *
+ * The official Nmap Windows builds include the Npcap software
+ * (https://npcap.com) for packet capture and transmission. It is under
+ * separate license terms which forbid redistribution without special
+ * permission. So the official Nmap Windows builds may not be redistributed
+ * without special permission (such as an Nmap OEM license).
+ *
+ * Source is provided to this software because we believe users have a
+ * right to know exactly what a program is going to do before they run it.
+ * This also allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to submit your changes as a Github PR
+ * or by email to the dev@nmap.org mailing list for possible incorporation into
+ * the main distribution. Unless you specify otherwise, it is understood that
+ * you are offering us very broad rights to use your submissions as described in
+ * the Nmap Public Source License Contributor Agreement. This is important
+ * because we fund the project by selling licenses with various terms, and also
+ * because the inability to relicense code has caused devastating problems for
+ * other Free Software projects (such as KDE and NASM).
+ *
+ * The free version of Nmap is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
+ * indemnification and commercial support are all available through the
+ * Npcap OEM program--see https://nmap.org/oem/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+#include "nbase.h"
+
+#if HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#include <assert.h>
+#include <stdio.h>
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+int getnameinfo(const struct sockaddr *sa, size_t salen,
+                char *host, size_t hostlen,
+                char *serv, size_t servlen, int flags) {
+
+  struct sockaddr_in *sin = (struct sockaddr_in *)sa;
+  struct hostent *he;
+
+  if (sin->sin_family != AF_INET || salen != sizeof(struct sockaddr_in))
+    return EAI_FAMILY;
+
+  if (serv != NULL) {
+    Snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
+    return 0;
+  }
+
+  if (host) {
+    if (flags & NI_NUMERICHOST) {
+      Strncpy(host, inet_ntoa(sin->sin_addr), hostlen);
+      return 0;
+    } else {
+      he = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr),
+                         AF_INET);
+      if (he == NULL) {
+        if (flags & NI_NAMEREQD)
+          return EAI_NONAME;
+
+        Strncpy(host, inet_ntoa(sin->sin_addr), hostlen);
+        return 0;
+      }
+
+      assert(he->h_name);
+      Strncpy(host, he->h_name, hostlen);
+      return 0;
+    }
+  }
+  return 0;
+}