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NmapOutputTable.cc

/***************************************************************************
 * NmapOutputTable.cc -- A relatively simple class for organizing Nmap     *
 * output into an orderly table for display to the user.                   *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2004 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.  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 may be  *
 * willing to sell alternative licenses (contact sales@insecure.com).      *
 * Many security scanner vendors already license Nmap technology such as  *
 * our remote OS fingerprinting database and code, service/version         *
 * detection system, and port scanning code.                               *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
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 * misunderstandings, we consider an application to constitute a           *
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 * following:                                                              *
 * o Integrates source code from Nmap                                      *
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 *   not derivative works.)                                                * 
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 *                                                                         *
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 * Source is provided to this software because we believe users have a     *
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 *                                                                         *
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 *                                                                         *
 ***************************************************************************/

/* $Id: NmapOutputTable.cc 3274 2006-04-22 23:00:09Z fyodor $ */

#ifdef WIN32
#include "nmap_winconfig.h"
#endif

#include "NmapOutputTable.h"
#include "utils.h"

#include <stdlib.h>

NmapOutputTable::NmapOutputTable(int nrows, int ncols) {
  numRows = nrows;
  numColumns = ncols;
  assert(numRows > 0);
  assert(numColumns > 0);
  table = (struct NmapOutputTableCell *) safe_zalloc(sizeof(struct NmapOutputTableCell) * nrows * ncols);
  maxColLen = (int *) safe_zalloc(sizeof(*maxColLen) * ncols);
  itemsInRow = (int *) safe_zalloc(sizeof(*itemsInRow) * nrows);
  tableout = NULL;
  tableoutsz = 0;
}

NmapOutputTable::~NmapOutputTable() {
  unsigned int col, row;
  struct NmapOutputTableCell *cell;

  for(row = 0; row < numRows; row++) {
    for(col = 0; col < numColumns; col++) {
      cell = getCellAddy(row, col);
      if (cell->weAllocated) {
      assert(cell->str);
      free(cell->str);
      }
    }
  }

  free(table);
  free(maxColLen);
  free(itemsInRow);
  if (tableout) free(tableout);
}

void NmapOutputTable::addItem(unsigned int row, unsigned int column, bool copy, const char *item, 
                        int itemlen) {
  struct NmapOutputTableCell *cell;

  assert(row < numRows);
  assert(column < numColumns);

  if (itemlen < 0)
    itemlen = strlen(item);

  if (itemlen == 0)
    return;

  cell = getCellAddy(row, column);
  assert(cell->str == NULL); // I'll worry about replacing members if I ever need it
  itemsInRow[row]++;

  cell->strlength = itemlen;

  if (copy) {
    cell->str = (char *) safe_malloc(itemlen + 1);
    memcpy(cell->str, item, itemlen);
    cell->str[itemlen] = '\0';
  } else {
    cell->str = (char *) item;
  }
  cell->weAllocated = copy;

  if (maxColLen[column] < itemlen)
    maxColLen[column] = itemlen;

  return;
}

// Like addItem except this version takes a printf-style format string 
// followed by varargs
void NmapOutputTable::addItemFormatted(unsigned int row, 
                                unsigned int column, 
                                const char *fmt, ...) {
  unsigned int res;
  va_list ap; 
  va_start(ap,fmt);
  char buf[4096];
  res = vsnprintf(buf, sizeof(buf), fmt, ap);
  va_end(ap);

  if (res < 0 || res > sizeof(buf))
    fatal("NmapOutputTable only supports adding up to 4096 to a cell via addItemFormatString.");

  addItem(row, column, true, buf, res);

  return;
}

// Returns the maximum size neccessary to create a printableTable() (the 
// actual size could be less);
int NmapOutputTable::printableSize() {

  int rowlen = 0;
  unsigned int i;

  for(i = 0; i < numColumns; i++) {
    rowlen += maxColLen[i];
  }

  /* Add the delimeter between each column, and the final newline */
  rowlen += numColumns;
  
  return rowlen * numRows;

}

 // This function sticks the entire table into a character buffer.
 // Note that the buffer is likely to be reused if you call the
 // function again, and it will also be invalidated if you free the
 // table. If size is not NULL, it will be filled with the size of
 // the ASCII table in bytes (not including the terminating NUL)

char *NmapOutputTable::printableTable(int *size) {
  unsigned int col, row;
  int maxsz = printableSize();
  char *p;
  int clen = 0;
  int i;
  struct NmapOutputTableCell *cell;
  int validthisrow;

  if (maxsz >= tableoutsz) {
    tableoutsz = maxsz + 1;
    tableout = (char *) safe_realloc(tableout, tableoutsz);
  }
  p = tableout;

  for(row = 0; row < numRows; row++) {
    validthisrow = 0;
    for(col = 0; col < numColumns; col++) {
      cell = getCellAddy(row, col);
      clen = maxColLen[col];
      if (cell->strlength > 0) {
      memcpy(p, cell->str,  cell->strlength);
      p += cell->strlength;
      validthisrow++;
      }
      // No point leaving trailing spaces ...
      if (validthisrow < itemsInRow[row]) {
      for(i=cell->strlength; i <= clen; i++) // one extra because of space between columns
        *(p++) = ' ';
      }
    }
    *(p++) = '\n';
  }
  *p = '\0';
  if (size) *size = p - tableout;
  return tableout;
}

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