source: trunk/src/common.c @ 159

/*
 * This file stores code common to the command line tools.
 * XXX: This should be converted to a proper library.
 *
 * Copyright (C) 2005-2008 Timothy D. Morgan
 * Copyright (C) 2002 Richard Sharpe, rsharpe@richardsharpe.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 *
 * $Id: common.c 159 2009-12-06 20:09:01Z tim $
 */

#include <iconv.h>
iconv_t conv_desc;

const char* key_special_chars = ",\"\\/";
const char* subfield_special_chars = ",\"\\|";
const char* common_special_chars = ",\"\\";

#define REGLOOKUP_VERSION "0.11.0"

#define REGLOOKUP_EXIT_OK       0
#define REGLOOKUP_EXIT_OSERR   71
#define REGLOOKUP_EXIT_USAGE   64
#define REGLOOKUP_EXIT_DATAERR 65
#define REGLOOKUP_EXIT_NOINPUT 66


void bailOut(int code, char* message)
{
  fprintf(stderr, message);
  exit(code);
}

void printMsgs(REGFI_FILE* f)
{
  char* msgs = regfi_get_messages(f);
  if(msgs != NULL)
  {
    fprintf(stderr, "%s", msgs);
    free(msgs);
  }
}

void clearMsgs(REGFI_FILE* f)
{
  char* msgs = regfi_get_messages(f);
  if(msgs != NULL)
    free(msgs);
}


/* Returns a newly malloc()ed string which contains original buffer,
 * except for non-printable or special characters are quoted in hex
 * with the syntax '\xQQ' where QQ is the hex ascii value of the quoted
 * character.  A null terminator is added, since only ascii, not binary,
 * is returned.
 */
static char* quote_buffer(const unsigned char* str, 
                          unsigned int len, const char* special)
{
  unsigned int i, added_len;
  unsigned int num_written = 0;

  unsigned int buf_len = sizeof(char)*(len+1);
  char* ret_val = NULL; 
  char* tmp_buf;

  if(buf_len > 0) 
    ret_val = malloc(buf_len);
  if(ret_val == NULL)
    return NULL;

  for(i=0; i<len; i++)
  {
    if(buf_len <= (num_written+5))
    {
      /* Expand the buffer by the memory consumption rate seen so far 
       * times the amount of input left to process.  The expansion is bounded 
       * below by a minimum safety increase, and above by the maximum possible 
       * output string length.  This should minimize both the number of 
       * reallocs() and the amount of wasted memory.
       */
      added_len = (len-i)*num_written/(i+1);
      if((buf_len+added_len) > (len*4+1))
        buf_len = len*4+1;
      else
      {
        if (added_len < 5)
          buf_len += 5;
        else
          buf_len += added_len;
      }

      tmp_buf = realloc(ret_val, buf_len);
      if(tmp_buf == NULL)
      {
        free(ret_val);
        return NULL;
      }
      ret_val = tmp_buf;
    }
    
    if(str[i] < 32 || str[i] > 126 || strchr(special, str[i]) != NULL)
    {
      num_written += snprintf(ret_val + num_written, buf_len - num_written,
                              "\\x%.2X", str[i]);
    }
    else
      ret_val[num_written++] = str[i];
  }
  ret_val[num_written] = '\0';

  return ret_val;
}


/* Returns a newly malloc()ed string which contains original string, 
 * except for non-printable or special characters are quoted in hex
 * with the syntax '\xQQ' where QQ is the hex ascii value of the quoted
 * character.
 */
static char* quote_string(const char* str, const char* special)
{
  unsigned int len;

  if(str == NULL)
    return NULL;

  len = strlen(str);
  return quote_buffer((const unsigned char*)str, len, special);
}


/*
 * Convert from UTF-16LE to ASCII.  Accepts a Unicode buffer, uni, and
 * it's length, uni_max.  Writes ASCII to the buffer ascii, whose size
 * is ascii_max.  Writes at most (ascii_max-1) bytes to ascii, and null
 * terminates the string.  Returns the length of the data written to
 * ascii.  On error, returns a negative errno code.
 */
static int uni_to_ascii(unsigned char* uni, char* ascii, 
                        uint32 uni_max, uint32 ascii_max)
{
  char* inbuf = (char*)uni;
  char* outbuf = ascii;
  size_t in_len = (size_t)uni_max;
  size_t out_len = (size_t)(ascii_max-1);
  int ret;

  conv_desc = iconv_open("US-ASCII//TRANSLIT", "UTF-16LE");

  ret = iconv(conv_desc, &inbuf, &in_len, &outbuf, &out_len);
  if(ret == -1)
  {
    iconv_close(conv_desc);
    return -errno;
  }
  *outbuf = '\0';

  iconv_close(conv_desc);  
  return ascii_max-out_len-1;
}


static char* quote_unicode(unsigned char* uni, uint32 length, 
                           const char* special, char** error_msg)
{
  char* ret_val;
  char* ascii = NULL;
  char* tmp_err;
  int ret_err;
  *error_msg = NULL;

  if(length+1 > 0)
    ascii = malloc(length+1);
  if(ascii == NULL)
  {
    *error_msg = (char*)malloc(27);
    if(*error_msg == NULL)
      return NULL;
    strcpy(*error_msg, "Memory allocation failure.");
    return NULL;
  }
  
  ret_err = uni_to_ascii(uni, ascii, length, length+1);
  if(ret_err < 0)
  {
    free(ascii);
    tmp_err = strerror(-ret_err);
    *error_msg = (char*)malloc(61+strlen(tmp_err));
    if(*error_msg == NULL)
      return NULL;

    sprintf(*error_msg, 
            "Unicode conversion failed with '%s'. Quoting as binary.", tmp_err);
    ret_val = quote_buffer(uni, length, special);
  }
  else
  {
    ret_val = quote_string(ascii, special);
    free(ascii);
  }
  
  return ret_val;
}


/*
 * Convert a data value to a string for display.  Returns NULL on error,
 * and the string to display if there is no error, or a non-fatal
 * error.  On any error (fatal or non-fatal) occurs, (*error_msg) will
 * be set to a newly allocated string, containing an error message.  If
 * a memory allocation failure occurs while generating the error
 * message, both the return value and (*error_msg) will be NULL.  It
 * is the responsibility of the caller to free both a non-NULL return
 * value, and a non-NULL (*error_msg).
 */
static char* data_to_ascii(REGFI_DATA* data, char** error_msg)
{
  char* ret_val;
  char* cur_quoted;
  char* tmp_ptr;
  char* delim;
  uint32 ret_val_left, i, tmp_len;

  if(data == NULL || data->size == 0)
  {
    *error_msg = (char*)malloc(37);
    if(*error_msg == NULL)
      return NULL;
    strcpy(*error_msg, "Data pointer was NULL or size was 0.");
    return NULL;
  }
  *error_msg = NULL;


  if(data->interpreted_size == 0)
  {
    *error_msg = (char*)malloc(51);
    if(*error_msg == NULL)
      return NULL;
    strcpy(*error_msg, "Data could not be interpreted, quoting raw buffer.");
    return quote_buffer(data->raw, data->size, common_special_chars);
  }

  switch (data->type) 
  {
  case REG_SZ:
    ret_val = quote_string((char*)data->interpreted.string, common_special_chars);
    if(ret_val == NULL && (*error_msg = (char*)malloc(49)) != NULL)
        strcpy(*error_msg, "Buffer could not be quoted due to unknown error.");

    return ret_val;
    break;

    
  case REG_EXPAND_SZ:
    ret_val = quote_string((char*)data->interpreted.expand_string, 
                           common_special_chars);
    if(ret_val == NULL && (*error_msg = (char*)malloc(49)) != NULL)
        strcpy(*error_msg, "Buffer could not be quoted due to unknown error.");

    return ret_val;
    break;

  case REG_LINK:
    ret_val = quote_string((char*)data->interpreted.link, common_special_chars);
    if(ret_val == NULL && (*error_msg = (char*)malloc(49)) != NULL)
        strcpy(*error_msg, "Buffer could not be quoted due to unknown error.");

    return ret_val;
    break;

  case REG_DWORD:
    ret_val = malloc(sizeof(char)*(8+2+1));
    if(ret_val == NULL)
      return NULL;

    sprintf(ret_val, "0x%.8X", data->interpreted.dword);
    return ret_val;
    break;

  case REG_DWORD_BE:
    ret_val = malloc(sizeof(char)*(8+2+1));
    if(ret_val == NULL)
      return NULL;

    sprintf(ret_val, "0x%.8X", data->interpreted.dword_be);
    return ret_val;
    break;

  case REG_QWORD:
    ret_val = malloc(sizeof(char)*(16+2+1));
    if(ret_val == NULL)
      return NULL;

    sprintf(ret_val, "0x%.16llX", 
            (long long unsigned int)data->interpreted.qword);
    return ret_val;
    break;

  case REG_MULTI_SZ:
    ret_val_left = data->interpreted_size*4+1;
    ret_val = malloc(ret_val_left);
    if(ret_val == NULL)
      return NULL;

    tmp_ptr = ret_val;
    tmp_ptr[0] = '\0';
    delim = "";
    for(i=0; data->interpreted.multiple_string[i] != NULL; i++)
    {
      cur_quoted = quote_string((char*)data->interpreted.multiple_string[i],
                                subfield_special_chars);
      if(cur_quoted != NULL && cur_quoted[0] != '\0')
      {
        tmp_len = snprintf(tmp_ptr, ret_val_left, "%s%s",delim, cur_quoted);
        tmp_ptr += tmp_len;
        ret_val_left -= tmp_len;
        free(cur_quoted);
      }
      delim = "|";
    }

    return ret_val;
    break;

    
  case REG_NONE:
    return quote_buffer(data->interpreted.none, data->interpreted_size,
                        common_special_chars);

    break;

  case REG_RESOURCE_LIST:
    return quote_buffer(data->interpreted.resource_list, data->interpreted_size,
                        common_special_chars);

    break;

  case REG_FULL_RESOURCE_DESCRIPTOR:
    return quote_buffer(data->interpreted.full_resource_descriptor, 
                        data->interpreted_size, common_special_chars);

    break;

  case REG_RESOURCE_REQUIREMENTS_LIST:
    return quote_buffer(data->interpreted.resource_requirements_list,
                        data->interpreted_size, common_special_chars);

    break;

  case REG_BINARY:
    return quote_buffer(data->interpreted.binary, data->interpreted_size,
                        common_special_chars);

    break;

  default:
    /* This shouldn't happen, since the regfi routines won't interpret 
     * unknown types, but just as a safety measure against library changes... 
     */
    *error_msg = (char*)malloc(65);
    if(*error_msg == NULL)
      return NULL;
    sprintf(*error_msg,
            "Unrecognized registry data type (0x%.8X); quoting as binary.",
            data->type);
    return quote_buffer(data->raw, data->size, common_special_chars);
  }
    
  return NULL;
}