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+#ifndef PROBESPEC_H
+#define PROBESPEC_H
+/***************************************************************************
+ * probespec.h -- Defines structures which specify probes to network ports *
+ * and protocols.                                                          *
+ ***********************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/
+ *
+ ***************************************************************************/
+#include <nbase.h>
+
+struct probespec_tcpdata {
+  u16 dport;
+  u8 flags;
+};
+
+struct probespec_udpdata {
+  u16 dport;
+};
+
+struct probespec_sctpdata {
+  u16 dport;
+  u8 chunktype;
+};
+
+struct probespec_icmpdata {
+  u8 type;
+  u8 code;
+};
+
+struct probespec_icmpv6data {
+  u8 type;
+  u8 code;
+};
+
+#define PS_NONE 0
+#define PS_TCP 1
+#define PS_UDP 2
+#define PS_PROTO 3
+#define PS_ICMP 4
+#define PS_ARP 5
+#define PS_CONNECTTCP 6
+#define PS_SCTP 7
+#define PS_ICMPV6 8
+#define PS_ND 9
+
+/* The size of this structure is critical, since there can be tens of
+   thousands of them stored together ... */
+typedef struct probespec {
+  /* To save space, I changed this from private enum (took 4 bytes) to
+     u8 that uses #defines above */
+  u8 type;
+  u8 proto; /* If not PS_ARP -- Protocol number ... eg IPPROTO_TCP, etc. */
+  union {
+    struct probespec_tcpdata tcp; /* If type is PS_TCP or PS_CONNECTTCP. */
+    struct probespec_udpdata udp; /* PS_UDP */
+    struct probespec_sctpdata sctp; /* PS_SCTP */
+    struct probespec_icmpdata icmp; /* PS_ICMP */
+    struct probespec_icmpv6data icmpv6; /* PS_ICMPV6 */
+    /* Nothing needed for PS_ARP, since src mac and target IP are
+       avail from target structure anyway */
+  } pd;
+} probespec;
+
+#endif