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nbase_str.c

/***************************************************************************
 * nbase_str.c -- string related functings in the nbase library.  These    *
 * were written by fyodor@insecure.org .                                   *
 *                                                                         *
 ***********************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                                      *
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 *   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        *
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 * These restrictions only apply when you actually redistribute Nmap.  For *
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 * http://nmap.org to download Nmap.                                       *
 *                                                                         *
 * We don't consider these to be added restrictions on top of the GPL, but *
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 * to our GPL-licensed Nmap product.  This is similar to the way Linus     *
 * Torvalds has announced his interpretation of how "derived works"        *
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 * Nmap - we don't speak for any other GPL products.                       *
 *                                                                         *
 * If you have any questions about the GPL licensing restrictions on using *
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 * we also offer alternative license to integrate Nmap into proprietary    *
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 * 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  *
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 * 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         *
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 * 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         *
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 * to reuse, modify, and relicense the code.  Nmap will always be          *
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 * 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: nbase_str.c 6860 2008-02-28 18:52:22Z fyodor $ */

#include "nbase.h"
#include <string.h>
#include <stdarg.h>
#include <stdio.h>

#ifndef HAVE_STRCASESTR
char *strcasestr(const char *haystack, const char *pneedle) {
char buf[512];
unsigned int needlelen;
const char *p;
char *needle, *q, *foundto;

/* Should crash if !pneedle -- this is OK */
if (!*pneedle) return (char *) haystack;
if (!haystack) return NULL;

needlelen = (unsigned int) strlen(pneedle);
 if (needlelen >= sizeof(buf)) {
   needle = (char *) malloc(needlelen + 1);
 } else needle = buf;
 p = pneedle; q = needle;
 while((*q++ = tolower(*p++)))
   ;
 p = haystack - 1; foundto = needle;
 while(*++p) {
   if(tolower(*p) == *foundto) {
     if(!*++foundto) {
       /* Yeah, we found it */
       if (needlelen >= sizeof(buf))
         free(needle);
       return (char *) (p - needlelen + 1);
     }
   } else foundto = needle;
 }
 if (needlelen >= sizeof(buf))
   free(needle);
 return NULL;
}
#endif

int Strncpy(char *dest, const char *src, size_t n) {
  strncpy(dest, src, n);
  if (dest[n-1] == '\0')
    return 0;
  dest[n-1] = '\0';
  return -1;
}

int Vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
{
      int ret;

      ret = vsnprintf(s, n, fmt, ap);

      if (ret < 0 || (unsigned) ret >= n)
            s[n - 1] = '\0';

      return ret;
}

int Snprintf(char *s, size_t n, const char *fmt, ...)
{
      va_list ap;
      int ret;

      va_start(ap, fmt);
      ret = Vsnprintf(s, n, fmt, ap);
      va_end(ap);

      return ret;
}

/* Trivial function that returns nonzero if all characters in str of length strlength are
   printable (as defined by isprint()) */
int stringisprintable(const char *str, int strlength) {
  int i;
  for(i=0; i < strlength; i++)
    if (!isprint((unsigned char) str[i]))
      return 0;

  return 1;
}

/* Convert non-printable characters to replchar in the string */
void replacenonprintable(char *str, int strlength, char replchar) {
  int i;
  for(i=0; i < strlength; i++)
    if (!isprint( (unsigned char) str[i]))
      str[i] = replchar;

  return;
}

/* Returns the position of the last directory separator (slash, also backslash
   on Win32) in a path. Returns -1 if none was found. */
static int find_last_path_separator(const char *path) {
#ifndef WIN32
  const char *PATH_SEPARATORS = "/";
#else
  const char *PATH_SEPARATORS = "\\/";
#endif
  const char *p;

  p = path + strlen(path) - 1;
  while (p >= path) {
    if (strchr(PATH_SEPARATORS, *p) != NULL)
      return p - path;
    p--;
  }

  return -1;
}

/* Returns the directory name part of a path (everything up to the last
   directory separator). If there is no separator, returns ".". If there is only
   one separator and it is the first character, returns "/". Returns NULL on
   error. The returned string must be freed. */
char *path_get_dirname(const char *path) {
  char *result;
  int i;

  i = find_last_path_separator(path);
  if (i == -1)
    return strdup(".");
  if (i == 0)
    return strdup("/");

  result = (char *) malloc(i + 1);
  if (result == NULL)
    return NULL;
  strncpy(result, path, i);
  result[i] = '\0';

  return result;
}

/* Returns the file name part of a path (everything after the last directory
   separator). Returns NULL on error. The returned string must be freed. */
char *path_get_basename(const char *path) {
  int i;

  i = find_last_path_separator(path);

  return strdup(path + i + 1);
}

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