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/*
Linux DNS client library implementation
Copyright (C) 2006 Krishna Ganugapati <krishnag@centeris.com>
Copyright (C) 2006 Gerald Carter <jerry@samba.org>
** NOTE! The following LGPL license applies to the libaddns
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "dns.h"
#include <ctype.h>
#ifdef HAVE_SYS_UUID_H
#include <sys/uuid.h>
#endif
static DNS_ERROR LabelList( TALLOC_CTX *mem_ctx,
const char *name,
struct dns_domain_label **presult )
{
struct dns_domain_label *result;
const char *dot;
for (dot = name; *dot != '\0'; dot += 1) {
char c = *dot;
if (c == '.')
break;
if (c == '-') continue;
if ((c >= 'a') && (c <= 'z')) continue;
if ((c >= 'A') && (c <= 'Z')) continue;
if ((c >= '0') && (c <= '9')) continue;
return ERROR_DNS_INVALID_NAME;
}
if ((dot - name) > 63) {
/*
* DNS labels can only be 63 chars long
*/
return ERROR_DNS_INVALID_NAME;
}
if (!(result = talloc_zero(mem_ctx, struct dns_domain_label))) {
return ERROR_DNS_NO_MEMORY;
}
if (*dot == '\0') {
/*
* No dot around, so this is the last component
*/
if (!(result->label = talloc_strdup(result, name))) {
TALLOC_FREE(result);
return ERROR_DNS_NO_MEMORY;
}
result->len = strlen(result->label);
*presult = result;
return ERROR_DNS_SUCCESS;
}
if (dot[1] == '.') {
/*
* Two dots in a row, reject
*/
TALLOC_FREE(result);
return ERROR_DNS_INVALID_NAME;
}
if (dot[1] != '\0') {
/*
* Something follows, get the rest
*/
DNS_ERROR err = LabelList(result, dot+1, &result->next);
if (!ERR_DNS_IS_OK(err)) {
TALLOC_FREE(result);
return err;
}
}
result->len = (dot - name);
if (!(result->label = talloc_strndup(result, name, result->len))) {
TALLOC_FREE(result);
return ERROR_DNS_NO_MEMORY;
}
*presult = result;
return ERROR_DNS_SUCCESS;
}
DNS_ERROR dns_domain_name_from_string( TALLOC_CTX *mem_ctx,
const char *pszDomainName,
struct dns_domain_name **presult )
{
struct dns_domain_name *result;
DNS_ERROR err;
if (!(result = talloc(mem_ctx, struct dns_domain_name))) {
return ERROR_DNS_NO_MEMORY;
}
err = LabelList( result, pszDomainName, &result->pLabelList );
if (!ERR_DNS_IS_OK(err)) {
TALLOC_FREE(result);
return err;
}
*presult = result;
return ERROR_DNS_SUCCESS;
}
/*********************************************************************
*********************************************************************/
char *dns_generate_keyname( TALLOC_CTX *mem_ctx )
{
char *result = NULL;
#if defined(WITH_DNS_UPDATES)
uuid_t uuid;
/*
* uuid_unparse gives 36 bytes plus '\0'
*/
if (!(result = talloc_array(mem_ctx, char, 37))) {
return NULL;
}
uuid_generate( uuid );
uuid_unparse( uuid, result );
#endif
return result;
}
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