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ldap_escape.c

/* 
   Unix SMB/CIFS implementation.
   ldap filter argument escaping

   Copyright (C) 1998, 1999, 2000 Luke Howard <lukeh@padl.com>,
   Copyright (C) 2003 Andrew Bartlett <abartlet@samba.org>

  
   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; either version 3 of the License, or
   (at your option) any later version.
   
   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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

/**
 * Escape a parameter to an LDAP filter string, so they cannot contain
 * embeded ( ) * or \ chars which may cause it not to parse correctly. 
 *
 * @param s The input string
 *
 * @return A string allocated with malloc(), containing the escaped string, 
 * and to be free()ed by the caller.
 **/

char *escape_ldap_string_alloc(const char *s)
{
      size_t len = strlen(s)+1;
      char *output = (char *)SMB_MALLOC(len);
      const char *sub;
      int i = 0;
      char *p = output;

      if (output == NULL) {
            return NULL;
      }
      
      while (*s)
      {
            switch (*s)
            {
            case '*':
                  sub = "\\2a";
                  break;
            case '(':
                  sub = "\\28";
                  break;
            case ')':
                  sub = "\\29";
                  break;
            case '\\':
                  sub = "\\5c";
                  break;
            default:
                  sub = NULL;
                  break;
            }
            
            if (sub) {
                  len = len + 3;
                  output = (char *)SMB_REALLOC(output, len);
                  if (!output) { 
                        return NULL;
                  }
                  
                  p = &output[i];
                  strncpy (p, sub, 3);
                  p += 3;
                  i += 3;

            } else {
                  *p = *s;
                  p++;
                  i++;
            }
            s++;
      }
      
      *p = '\0';
      return output;
}

char *escape_rdn_val_string_alloc(const char *s)
{
      char *output, *p;

      /* The maximum size of the escaped string can be twice the actual size */
      output = (char *)SMB_MALLOC(2*strlen(s) + 1);

      if (output == NULL) {
            return NULL;
      }

      p = output;
      
      while (*s)
      {
            switch (*s)
            {
            case ',':
            case '=':
            case '+':
            case '<':
            case '>':
            case '#':
            case ';':
            case '\\':
            case '\"':
                  *p++ = '\\';
                  *p++ = *s;
                  break;
            default:
                  *p = *s;
                  p++;
            }
            
            s++;
      }
      
      *p = '\0';

      /* resize the string to the actual final size */
      output = (char *)SMB_REALLOC(output, strlen(output) + 1);
      return output;
}

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