/*************************************************************************** * Nping.cc -- This file contains function main() and some other general * * high level functions. * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2016 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 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS * * AND EXCEPTIONS DESCRIBED HEREIN. 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@nmap.com). Dozens of software * * vendors already license Nmap technology such as host discovery, port * * scanning, OS detection, version detection, and the Nmap Scripting * * Engine. * * * * Note that the GPL places important restrictions on "derivative works", * * yet it does not provide a detailed definition of that term. To avoid * * misunderstandings, we interpret that term as broadly as copyright law * * allows. For example, we consider an application to constitute a * * derivative work for the purpose of this license if it does any of the * * following with any software or content covered by this license * * ("Covered Software"): * * * * o Integrates source code from Covered Software. * * * * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db * * or nmap-service-probes. * * * * o Is designed specifically to execute Covered Software and parse the * * results (as opposed to typical shell or execution-menu apps, which will * * execute anything you tell them to). * * * * o Includes Covered Software in a proprietary executable installer. The * * installers produced by InstallShield are an example of this. Including * * Nmap with other software in compressed or archival form does not * * trigger this provision, provided appropriate open source decompression * * or de-archiving software is widely available for no charge. For the * * purposes of this license, an installer is considered to include Covered * * Software even if it actually retrieves a copy of Covered Software from * * another source during runtime (such as by downloading it from the * * Internet). * * * * o Links (statically or dynamically) to a library which does any of the * * above. * * * * o Executes a helper program, module, or script to do any of the above. * * * * This list is not exclusive, but is meant to clarify our interpretation * * of derived works with some common examples. Other people may interpret * * the plain GPL differently, so we consider this a special exception to * * the GPL that we apply to Covered Software. Works which meet any of * * these conditions must conform to all of the terms of this license, * * particularly including the GPL Section 3 requirements of providing * * source code and allowing free redistribution of the work as a whole. * * * * As another 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 docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. * * * * Any redistribution of Covered Software, including any derived works, * * must obey and carry forward all of the terms of this license, including * * obeying all GPL rules and restrictions. For example, source code of * * the whole work must be provided and free redistribution must be * * allowed. All GPL references to "this License", are to be treated as * * including the terms and conditions of this license text as well. * * * * Because this license imposes special exceptions to the GPL, Covered * * Work may not be combined (even as part of a larger work) with plain GPL * * software. The terms, conditions, and exceptions of this license must * * be included as well. This license is incompatible with some other open * * source licenses as well. In some cases we can relicense portions of * * Nmap or grant special permissions to use it in other open source * * software. Please contact fyodor@nmap.org with any such requests. * * Similarly, we don't incorporate incompatible open source software into * * Covered Software without special permission from the copyright holders. * * * * If you have any questions about the licensing restrictions on using * * Nmap in other works, are 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. They also fund the * * continued development of Nmap. Please email sales@nmap.com for further * * information. * * * * If you have received a written license agreement or contract for * * Covered Software stating terms other than these, you may choose to use * * and redistribute Covered Software under those terms instead of these. * * * * 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 send your changes * * to the dev@nmap.org mailing list for possible incorporation into the * * main distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, or checking them into the Nmap * * source code repository, it is understood (unless you specify otherwise) * * that you are offering the Nmap Project (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 Nmap * * license file for more details (it's in a COPYING file included with * * Nmap, and also available from https://svn.nmap.org/nmap/COPYING) * * * ***************************************************************************/ #include "nping.h" #include "output.h" #include "NpingOps.h" #include "utils.h" #include "utils_net.h" #include "nsock.h" #include "global_structures.h" #include "ArgParser.h" #include "EchoHeader.h" #include "EchoClient.h" #include "EchoServer.h" #include "ProbeMode.h" #include "common.h" #include "dnet.h" #include "pcap.h" #include #include #ifdef WIN32 #include "winfix.h" #endif using namespace std; NpingOps o; EchoClient ec; EchoServer es; int do_safe_checks(); void test_stuff(); void signal_handler(int signo); /** Main function. It basically inits Nping working environment, calls the * command-line argument parser, and enters the appropriate mode (normal * probe mode, echo client or echo server). */ int main(int argc, char *argv[] ){ struct tm *tm; /* For time display */ time_t now; /* Stores current time */ char tbuf[128]; /* Stores current time as a string */ ArgParser a; /* Command line argument parser */ unsigned long int i=0; ProbeMode prob; NpingTarget *t=NULL; /* Get current time */ now = time(NULL); tm = localtime(&now); o.stats.startRuntime(); /* Some run-time tests to ensure everything works as expected */ do_safe_checks(); /* Init a few things on Windows */ #ifdef WIN32 win_pre_init(); win_init(); #endif /* Register the SIGINT signal so when the users presses CTRL-C we print stats * before quitting. */ #if HAVE_SIGNAL signal(SIGINT, signal_handler); #endif /* Let's parse and validate user supplied args */ a.parseArguments(argc, argv); o.validateOptions(); /* ISO 8601 date/time -- http://www.cl.cam.ac.uk/~mgk25/iso-time.html */ if ( strftime(tbuf, sizeof(tbuf), "%Y-%m-%d %H:%M %Z", tm) <= 0) nping_fatal(QT_3,"Unable to properly format time"); nping_print(QT_1, "\nStarting %s %s ( %s ) at %s", NPING_NAME, NPING_VERSION, NPING_URL, tbuf); /*If nping is called on something that doesn't take port scanning * we should alert the user that their port command is going to be ignored * I choose to print out a Fatal error since the scan doesn't make sense. */ if(o.issetTargetPorts() && !o.scan_mode_uses_target_ports(o.getMode())) nping_fatal(QT_3, "You cannot use -p (explicit port selection) in your current scan mode.\n(Perhaps you meant to use --tcp or --udp)"); /* Resolve and cache target specs */ nping_print(DBG_2,"Resolving specified targets..."); o.targets.processSpecs(); if( ((i=o.targets.getTargetsFetched())<=0) && o.getRole()!=ROLE_SERVER ) nping_fatal(QT_3, "Execution aborted. Nping needs at least one valid target to operate."); else nping_print(DBG_2,"%lu target IP address%s determined.", i, (i==1)? "":"es" ); switch( o.getRole() ){ case ROLE_NORMAL: prob.start(); prob.cleanup(); break; case ROLE_CLIENT: t=o.targets.getNextTarget(); o.targets.rewind(); ec.start(t, o.getEchoPort() ); ec.cleanup(); break; case ROLE_SERVER: o.stats.startClocks(); es.start(); es.cleanup(); o.stats.stopClocks(); break; default: nping_fatal(QT_3, "Invalid role %d\n", o.getRole() ); break; } /* Display stats, clean up and quit */ o.stats.stopRuntime(); o.displayStatistics(); o.displayNpingDoneMsg(); o.cleanup(); exit(EXIT_SUCCESS); exit(EXIT_SUCCESS); } /* End of main() */ /* Things that should be guaranteed by the compiler, standard library, OS etc, * but that we check just in case... */ int do_safe_checks(){ if( (sizeof(u32) != 4) || (sizeof(u16) != 2) || (sizeof(u8) != 1) ) nping_fatal(QT_3,"Types u32, u16 and u8 do not have the correct sizes on your system."); test_stuff(); /* Little function that is called quite early to test some misc stuff. */ return OP_SUCCESS; } /* End of do_safe_checks() */ /** Use this function whenever you have some code that you want to test, but * you don't want to bother creating a new dummy main.c file, etc. This * function is called by do_safe_checks() at the beginning of nping execution. * Command line arguments have not been parsed yet so even if you run nping * with no arguments you will not get an error, and this function will be * called. You probably want to place an exit() call at the end of your * testing code so Nping does not actually continue its normal execution path * but exit after your tests. */ void test_stuff(){ return; } /* End of test_stuff() */ /** This function is called whenever user presses CTRL-C. Basically what we * do here is stop Tx and Rx clocks, stop global clock, display statistics, * do a bit of cleanup and exit the program. The exit() call makes the * program return EXIT_FAILURE instead of the usual EXIT_SUCCESS. * * TODO: Many of the things done in this function may not be safe due to * reentrancy issues. Check http://seclists.org/nmap-dev/2009/q3/0596.html * and http://seclists.org/nmap-dev/2009/q3/0596.html */ void signal_handler(int signo){ fflush(stdout); nping_print(DBG_1,"signal_handler(): Received signal %d", signo); switch(signo) { case SIGINT: o.stats.stopTxClock(); o.stats.stopRxClock(); o.stats.stopRuntime(); o.displayStatistics(); o.displayNpingDoneMsg(); o.cleanup(); fflush(stderr); exit(EXIT_FAILURE); break; default: nping_warning(QT_2, "signal_handler(): Unexpected signal received (%d). Please report a bug.", signo); break; } fflush(stderr); exit(EXIT_FAILURE); } /* End of signal_handler() */