1 files changed, 128 insertions, 0 deletions
diff --git a/ncat/sockaddr_u.h b/ncat/sockaddr_u.h
new file mode 100644
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--- /dev/null
+++ b/ncat/sockaddr_u.h
@@ -0,0 +1,128 @@
+/***************************************************************************
+ * sockaddr_u.h -- a union containing sockaddr types compatible with C99   *
+ * strict-aliasing rules.                                                  *
+ ***********************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 "ncat_config.h"
+
+#ifndef SOCKADDR_U_H_
+#define SOCKADDR_U_H_
+
+#ifdef WIN32
+# include <ws2def.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+#if HAVE_SYS_UN_H
+# include <sys/un.h>
+#endif
+#if HAVE_LINUX_VM_SOCKETS_H
+#include <linux/vm_sockets.h>
+#endif
+
+union sockaddr_u {
+    struct sockaddr_storage storage;
+#ifdef HAVE_SYS_UN_H
+    struct sockaddr_un un;
+#endif
+#ifdef HAVE_LINUX_VM_SOCKETS_H
+    struct sockaddr_vm vm;
+#endif
+    struct sockaddr_in in;
+    struct sockaddr_in6 in6;
+    struct sockaddr sockaddr;
+};
+
+static inline socklen_t get_socklen(const union sockaddr_u *s)
+{
+    switch(s->storage.ss_family) {
+#ifdef HAVE_SYS_UN_H
+      case AF_UNIX:
+        return SUN_LEN(&s->un);
+        break;
+#endif
+#ifdef HAVE_LINUX_VM_SOCKETS_H
+      case AF_VSOCK:
+        return sizeof(struct sockaddr_vm);
+        break;
+#endif
+#ifdef HAVE_SOCKADDR_SA_LEN
+      default:
+        return s->sockaddr.sa_len;
+        break;
+#else
+      case AF_INET:
+        return sizeof(struct sockaddr_in);
+        break;
+#ifdef AF_INET6
+      case AF_INET6:
+        return sizeof(struct sockaddr_in6);
+        break;
+#endif
+      default:
+        return sizeof(union sockaddr_u);
+        break;
+#endif
+    }
+    return 0;
+}
+#endif