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/***************************************************************************
* Nping.cc -- This file contains function main() and some other general *
* high level functions. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 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/
*
***************************************************************************/
#ifdef WIN32
#include "winfix.h"
#endif
#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 <signal.h>
#include <time.h>
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 */
int err;
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 */
tzset();
now = time(NULL);
err = n_localtime(&now, &tm);
if (err)
nping_fatal(QT_3,"Error in localtime: %s", strerror(err));
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();
#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);
#ifdef WIN32
// Must come after parseArguments because of --unprivileged
// Must come before validateOptions because it sets o.isRoot
win_init();
#endif
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();
// Cleanup currently does nothing, but needs to be called in case
// it does something in the future.
es.cleanup(); // lgtm [cpp/useless-expression]
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() */
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