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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) 1996-2008 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  *
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 * 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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 *   not derivative works.)                                                * 
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 * Source is provided to this software because we believe users have a     *
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 * included with Nmap.                                                     *
 *                                                                         *
 ***************************************************************************/

/* $Id: NmapOutputTable.cc 7640 2008-05-22 20:45:32Z 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 fullrow,
                        bool copy, const char *item, int itemlen) {
  struct NmapOutputTableCell *cell;
  int mc = maxColLen[column];
  
  addItem(row, column, copy, item, itemlen);

  if(fullrow) {
    maxColLen[column] = mc;
    cell = getCellAddy(row, column);
    cell->fullrow = fullrow;
  }
  return;
}

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;
}

void NmapOutputTable::addItemFormatted(unsigned int row, 
                                unsigned int column,
                                bool fullrow,
                                const char *fmt, ...) {
  struct NmapOutputTableCell *cell;
  int mc = maxColLen[column];
  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 > sizeof(buf))
    fatal("NmapOutputTable only supports adding up to 4096 to a cell via %s.", __func__);

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

  if(fullrow) {
    maxColLen[column] = mc;
    cell = getCellAddy(row, column);
    cell->fullrow = fullrow;
  }
}

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

  struct NmapOutputTableCell *cell;
  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;

  // if one of the fullrow tables is larger than the single column
  // roles then the maximal rowlen needs to be adjusted.
  for(i = 0; i < numRows; i++) {
    cell = getCellAddy(i, 0);
    if(cell->fullrow && cell->strlength > rowlen)
      rowlen = cell->strlength;
  }
  
  return rowlen * numRows;

}

/* True if every column in nrow is empty */
bool NmapOutputTable::emptyRow(unsigned int nrow) {
      NmapOutputTableCell *cell;
      unsigned int col;
      bool isEmpty = true;
      
      assert(nrow < numRows);

      for(col = 0 ; col < numColumns; col++) {
            cell = getCellAddy(nrow, col);
            if(cell->strlength > 0) {
                  isEmpty = false;
                  break;
            }
      }
      return isEmpty;         
}

 // 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) 
 // All blank rows are removed from the returned string
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;

    if(emptyRow(row)) 
      continue;

    cell = getCellAddy(row, 0);
    if(cell->fullrow && cell->strlength > 0) {
      memcpy(p, cell->str,  cell->strlength);
      p += cell->strlength;
    } else {
      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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