/*************************************************************************** * tcpip.h -- Various functions relating to low level TCP/IP handling,     * * including sending raw packets, routing, printing packets, reading from  * * libpcap, etc.                                                           * *                                                                         * ***********************IMPORTANT NMAP LICENSE TERMS************************ *                                                                         * * The Nmap Security Scanner is (C) 1996-2008 Insecure.Com LLC. Nmap is    * * also a registered trademark of Insecure.Com LLC.  This program is free  * * software; you may redistribute and/or modify it under the terms of the  * * GNU General Public License as published by the Free Software            * * Foundation; Version 2 with the clarifications and exceptions described  * * below.  This guarantees your right to use, modify, and redistribute     * * this software under certain conditions.  If you wish to embed Nmap      * * technology into proprietary software, we sell alternative licenses      * * (contact sales@insecure.com).  Dozens of software vendors already       * * license Nmap technology such as host discovery, port scanning, OS       * * detection, and version detection.                                       * *                                                                         * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term.  To avoid       * * misunderstandings, we consider an application to constitute a           * * "derivative work" for the purpose of this license if it does any of the * * following:                                                              * * o Integrates source code from Nmap                                      * * o Reads or includes Nmap copyrighted data files, such as                * *   nmap-os-fingerprints or nmap-service-probes.                          * * o Executes Nmap and parses the results (as opposed to typical shell or  * *   execution-menu apps, which simply display raw Nmap output and so are  * *   not derivative works.)                                                *  * o Integrates/includes/aggregates Nmap into a proprietary executable     * *   installer, such as those produced by InstallShield.                   * * o Links to a library or executes a program that does any of the above   * *                                                                         * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap.  This list is not exclusive, but is just meant to        * * clarify our interpretation of derived works with some common examples.  * * These restrictions only apply when you actually redistribute Nmap.  For * * example, nothing stops you from writing and selling a proprietary       * * front-end to Nmap.  Just distribute it by itself, and point people to   * * http://insecure.org/nmap/ to download Nmap.                             * *                                                                         * * We don't consider these to be added restrictions on top of the GPL, but * * just a clarification of how we interpret "derived works" as it applies  * * to our GPL-licensed Nmap product.  This is similar to the way Linus     * * Torvalds has announced his interpretation of how "derived works"        * * applies to Linux kernel modules.  Our interpretation refers only to     * * Nmap - we don't speak for any other GPL products.                       * *                                                                         * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help.  As mentioned above,  * * we also offer alternative license to integrate Nmap into proprietary    * * applications and appliances.  These contracts have been sold to dozens  * * of software vendors, and generally include a perpetual license as well  * * as providing for priority support and updates as well as helping to     * * fund the continued development of Nmap technology.  Please email        * * sales@insecure.com for further information.                             * *                                                                         * * As a special exception to the GPL terms, Insecure.Com LLC grants        * * permission to link the code of this program with any version of the     * * OpenSSL library which is distributed under a license identical to that  * * listed in the included Copying.OpenSSL file, and distribute linked      * * combinations including the two. You must obey the GNU GPL in all        * * respects for all of the code used other than OpenSSL.  If you modify    * * this file, you may extend this exception to your version of the file,   * * but you are not obligated to do so.                                     * *                                                                         * * If you received these files with a written license agreement or         * * contract stating terms other than the terms above, then that            * * alternative license agreement takes precedence over these comments.     * *                                                                         * * 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 (none     * * have been found so far).                                                * *                                                                         * * Source code also allows you to port Nmap to new platforms, fix bugs,    * * and add new features.  You are highly encouraged to send your changes   * * to fyodor@insecure.org for possible incorporation into the main         * * distribution.  By sending these changes to Fyodor or one the            * * Insecure.Org development mailing lists, it is assumed that you are      * * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right * * to reuse, modify, and relicense the code.  Nmap will always be          * * available Open Source, but this is important because the inability to   * * relicense code has caused devastating problems for other Free Software  * * projects (such as KDE and NASM).  We also occasionally relicense the    * * code to third parties as discussed above.  If you wish to specify       * * special license conditions of your contributions, just say so when you  * * send them.                                                              * *                                                                         * * This program 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.  See the GNU       * * General Public License for more details at                              * * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included  * * with Nmap.                                                              * *                                                                         * ***************************************************************************//* $Id: tcpip.h 6633 2007-12-22 06:32:03Z fyodor $ */#ifndef TCPIP_H#define TCPIP_H#ifdef HAVE_CONFIG_H#include "config.h"#endif#include "nbase.h"#ifdef WIN32#include "mswin32\winclude.h"#else#ifdef STDC_HEADERS#include <stdlib.h>#elsevoid *malloc();void *realloc();#endif#if STDC_HEADERS || HAVE_STRING_H#include <string.h>#if !STDC_HEADERS && HAVE_MEMORY_H#include <memory.h>#endif#endif#if HAVE_STRINGS_H#include <strings.h>#endif#ifdef HAVE_BSTRING_H#include <bstring.h>#endif#include <ctype.h>#include <sys/types.h>#ifdef HAVE_SYS_PARAM_H#include <sys/param.h> /* Defines MAXHOSTNAMELEN on BSD*/#endif/* Linux uses these defines in netinet/ip.h to use the correct struct ip */#ifndef __FAVOR_BSD#define __FAVOR_BSD 1#endif#ifndef _BSD_SOURCE#define _BSD_SOURCE 1#endif#ifndef __USE_BSD#define __USE_BSD 1#endif/* BSDI needs this to insure the correct struct ip */#undef _IP_VHL#include <stdio.h>#if HAVE_NETINET_IN_H#include <netinet/in.h>#endif#ifdef HAVE_RPC_TYPES_H#include <rpc/types.h>#endif#ifdef HAVE_NETDB_H#include <netdb.h>#endif#if HAVE_SYS_SOCKET_H#include <sys/socket.h>#endif#include <arpa/inet.h>#ifndef NETINET_IN_SYSTEM_H  /* why the HELL does OpenBSD not do this? */#include <netinet/in_systm.h> /* defines n_long needed for netinet/ip.h */#define NETINET_IN_SYSTEM_H#endif#ifndef NETINET_IP_H  /* why the HELL does OpenBSD not do this? */#include <netinet/ip.h>#define NETINET_IP_H#endif#if HAVE_UNISTD_H#include <unistd.h>#endif#include <fcntl.h>#if TIME_WITH_SYS_TIME# include <sys/time.h># include <time.h>#else# if HAVE_SYS_TIME_H#  include <sys/time.h># else#  include <time.h># endif#endif#include <sys/ioctl.h>#ifdef __cplusplusextern "C" {#endif#include <pcap.h>#ifdef __cplusplus}#endif#if HAVE_SYS_SOCKIO_H#include <sys/sockio.h>  /* SIOCGIFCONF for Solaris */#endif#endif /* WIN32 */#include <setjmp.h>#include <errno.h>#include <signal.h>#include <dnet.h>#ifndef WIN32#include <netinet/ip_icmp.h>#endiftypedef enum { devt_ethernet, devt_loopback, devt_p2p, devt_other  } devtype;#include "nmap.h"#include "global_structures.h"#ifndef INET_ADDRSTRLEN#define INET_ADDRSTRLEN 16#endif/* Used for tracing all packets sent or received (eg the   --packet_trace option) */class PacketTrace { public:  /*  static const int SEND=1;      static const int RCV=2; */  enum pdirection { SENT=1, RCVD=2 };  /* Takes an IP PACKET and prints it if packet tracing is enabled.     'packet' must point to the IPv4 header. The direction must be     PacketTrace::SENT or PacketTrace::RCVD .  Optional 'now' argument     makes this function slightly more efficient by avoiding a gettimeofday()     call. */  static void trace(pdirection pdir, const u8 *packet, u32 len,		    struct timeval *now=NULL);/* Adds a trace entry when a connect() is attempted if packet tracing   is enabled.  Pass IPPROTO_TCP or IPPROTO_UDP as the protocol.  The   sock may be a sockaddr_in or sockaddr_in6.  The return code of   connect is passed in connectrc.  If the return code is -1, get the   errno and pass that as connect_errno. */  static void traceConnect(u8 proto, const struct sockaddr *sock, 			   int socklen, int connectrc, int connect_errno,			   const struct timeval *now);  /* Takes an ARP PACKET (including ethernet header) and prints it if