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 * utils.h -- Various miscellaneous utility functions which defy           *
 * categorization :)                                                       *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2009 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.                                       *
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 * 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-db 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.)                                                * 
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 * included with Nmap.                                                     *
 *                                                                         *

/* $Id: utils.h 15282 2009-08-25 18:09:19Z luis $ */

#ifndef UTILS_H
#define UTILS_H

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "nmap.h"
#ifdef WIN32
#include "mswin32\winclude.h"
#include <sys/types.h>

#include <netinet/in.h>

#include <sys/mman.h>
#include "nmap_config.h"

#include <unistd.h>

# include <sys/time.h>
# include <time.h>
#  include <sys/time.h>
# else
#  include <time.h>
# endif

#include "nbase.h"

#include "nmap_error.h"
#include "global_structures.h"

/* Arithmatic difference modulo 2^32 */
#ifndef MOD_DIFF
#define MOD_DIFF(a,b) ((u32) (MIN((u32)(a) - (u32 ) (b), (u32 )(b) - (u32) (a))))

/* Arithmatic difference modulo 2^16 */
#define MOD_DIFF_USHORT(a,b) ((MIN((unsigned short)((unsigned short)(a) - (unsigned short ) (b)), (unsigned short) ((unsigned short )(b) - (unsigned short) (a)))))
#ifndef FALSE
#define FALSE 0
#ifndef TRUE
#define TRUE 1

#define NIPQUAD(addr) \
        (((addr) >> 0)  & 0xff), \
        (((addr) >> 8)  & 0xff), \
        (((addr) >> 16) & 0xff), \
        (((addr) >> 24) & 0xff)

#define MAX_PARSE_ARGS 254 /* +1 for integrity checking + 1 for null term */

/* Return num if it is between min and max.  Otherwise return min or
   max (whichever is closest to num), */
template<class T> T box(T bmin, T bmax, T bnum) {
  if (bmin > bmax)
    fatal("box(%d, %d, %d) called (min,max,num)", (int) bmin, (int) bmax, (int) bnum);
  //  assert(bmin <= bmax);
  if (bnum >= bmax)
    return bmax;
  if (bnum <= bmin)
    return bmin;
  return bnum;

int wildtest(char *wild, char *test);

void nmap_hexdump(unsigned char *cp, unsigned int length);

/* Compare a canonical option name (e.g. "max-scan-delay") with a
   user-generated option such as "max_scan_delay" and returns 0 if the
   two values are considered equivalant (for example, - and _ are
   considered to be the same), nonzero otherwise. */
int optcmp(const char *canonical, const char *instance);

/* Scramble the contents of an array*/
void genfry(unsigned char *arr, int elem_sz, int num_elem);
void shortfry(unsigned short *arr, int num_elem);
/* Like the perl equivialent -- It removes the terminating newline from string
   IF one exists.  It then returns the POSSIBLY MODIFIED string */
char *chomp(char *string);

// Send data to a socket, keep retrying until an error or the full length
// is sent.  Returns -1 if there is an error, or len if the full length was sent.
int Send(int sd, const void *msg, size_t len, int flags);

unsigned int gcd_n_uint(int nvals, unsigned int *val);

int arg_parse(const char *command, char ***argv);
void arg_parse_free(char **argv);

/* Convert a string in the format of a roughly C-style string literal
   (e.g. can have \r, \n, \xHH escapes, etc.) into a binary string.
   This is done in-place, and the new (shorter or the same) length is
   stored in newlen.  If parsing fails, NULL is returned, otherwise
   str is returned. */
char *cstring_unescape(char *str, unsigned int *len);

/* This function converts zero-terminated 'txt' string to binary 'data'.
   It is used to parse user input for ip options. Some examples of possible input
   strings and results:
      '\x01*2\xA2'      -> [0x01,0x01,0xA2]     // with 'x' number is parsed in hex
      '\01\01\255'      -> [0x01,0x01,0xFF]     // without 'x' its in decimal
      '\x01\x00*2'      -> [0x01,0x00,0x00]     // '*' is copying char
      'R'         -> Record Route with 9 slots
      'S' -> Strict Route with 2 slots
      'L' -> Loose Route with 2 slots
      'T'         -> Record Timestamp with 9 slots
      'U'         -> Record Timestamp and Ip Address with 4 slots
int parse_ip_options(char *txt, u8 *data, int datalen, int* firsthopoff, int* lasthopoff);

void bintohexstr(char *buf, int buflen, char *src, int srclen);

char* print_ip_options(u8* ipopt, int ipoptlen);

char *strerror(int errnum);

/* mmap() an entire file into the address space.  Returns a pointer
   to the beginning of the file.  The mmap'ed length is returned
   inside the length parameter.  If there is a problem, NULL is
   returned, the value of length is undefined, and errno is set to
   something appropriate.  The user is responsible for doing
   an munmap(ptr, length) when finished with it.  openflags should 
char *mmapfile(char *fname, int *length, int openflags);

#ifdef WIN32
int win32_munmap(char *filestr, int filelen);
#endif /* WIN32 */

#endif /* UTILS_H */

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