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 * utils.h -- Various miscellaneous utility functions which defy           *
 * categorization :)                                                       *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
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 * also a registered trademark of Insecure.Com LLC.  This program is free  *
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 *                                                                         *

/* $Id: utils.h 3994 2006-09-16 02:25:20Z fyodor $ */

#ifndef UTILS_H
#define UTILS_H

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

#include <netinet/in.h>

#include <assert.h>
#include <sys/mman.h>
#include "config.h"

#include <unistd.h>

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

#include "nmap_error.h"
#include "nmap.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 */

/* Timeval subtraction in microseconds */
#define TIMEVAL_SUBTRACT(a,b) (((a).tv_sec - (b).tv_sec) * 1000000 + (a).tv_usec - (b).tv_usec)
/* Timeval subtract in milliseconds */
#define TIMEVAL_MSEC_SUBTRACT(a,b) ((((a).tv_sec - (b).tv_sec) * 1000) + ((a).tv_usec - (b).tv_usec) / 1000)
/* Timeval subtract in seconds; truncate towards zero */
#define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec < (b).tv_usec) ? - 1 : 0))

/* assign one timeval to another timeval plus some msecs: a = b + msecs */
#define TIMEVAL_MSEC_ADD(a, b, msecs) (a).tv_sec = (b).tv_sec + ((msecs) / 1000); (a).tv_usec = (b).tv_usec + ((msecs) % 1000) * 1000; (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000
#define TIMEVAL_ADD(a, b, usecs) (a).tv_sec = (b).tv_sec + ((usecs) / 1000000); (a).tv_usec = (b).tv_usec + ((usecs) % 1000000); (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000

/* 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;

void hdump(unsigned char *packet, unsigned int len);
void lamont_hdump(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);

/* Converts an Nmap time specification string into milliseconds.  If
   the string is a plain non-negative number, it is considered to
   already be in milliseconds and is returned.  If it is a number
   followed by 's' (for seconds), 'm' (minutes), or 'h' (hours), the
   number is converted to milliseconds and returned.  If Nmap cannot
   parse the string, it is returned instead. */
long tval2msecs(char *tspec);

/* 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);

/* Convert a comma-separated list of ASCII u16-sized numbers into the
   given 'dest' array, which is of total size (meaning sizeof() as
   opposed to numelements) of destsize.  If min_elem and max_elem are
   provided, each number must be within (or equal to) those
   constraints.  The number of numbers stored in 'dest' is returned,
   except that -1 is returned in the case of an error. If -1 is
   returned and errorstr is non-null, *errorstr is filled with a ptr to a
   static string literal describing the error. */
int numberlist2array(char *expr, u16 *dest, int destsize, char **errorstr, 
                 u16 min_elem=0, u16 max_elem=65535);

/* 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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