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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2011 Red Hat
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 <string.h>
#include <errno.h>
#include <talloc.h>
#include "util/util.h"
#include "responder/sudo/sudosrv.h"
#include "responder/sudo/sudosrv_private.h"
/*
* Reads null-terminated string.
*/
int sudosrv_query_parse_string(TALLOC_CTX *mem_ctx,
char *query,
int query_length,
int start_pos,
int *_end_pos,
char **_string)
{
TALLOC_CTX *tmp_ctx = NULL;
char *current_pos = query + start_pos;
char *string = NULL;
int ret = EOK;
if (start_pos > query_length) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Query is too short\n"));
return EINVAL;
}
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
ret = ENOMEM;
goto done;
}
if (*current_pos != '\0') {
string = talloc_strdup(tmp_ctx, current_pos);
if (string == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strdup() failed\n"));
return ENOMEM;
}
current_pos = strchr(current_pos, '\0');
if (current_pos == NULL) {
ret = ESPIPE;
goto done;
}
}
/* go one char past \0 */
current_pos++;
*_end_pos = current_pos - query;
*_string = talloc_steal(mem_ctx, string);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
/*
* Reads array in format:
* value1\0value2\0...\0\0
*/
int sudosrv_query_parse_array(TALLOC_CTX *mem_ctx,
char *query,
int query_length,
int start_pos,
int *_end_pos,
int *_count,
char ***_array)
{
TALLOC_CTX *tmp_ctx = NULL;
char *current_pos = query + start_pos;
char **array = NULL;
int count = 0;
int ret = EOK;
if (start_pos > query_length) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Query is too short\n"));
return EINVAL;
}
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
ret = ENOMEM;
goto done;
}
if (*current_pos != '\0') {
/* array with at least one element */
do {
count++;
array = talloc_realloc(tmp_ctx, array, char*, count);
if (array == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
ret = ENOMEM;
goto done;
}
array[count - 1] = talloc_strdup(array, current_pos);
if (array[count - 1] == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strdup() failed\n"));
return ENOMEM;
}
/* find end of this element */
current_pos = strchr(current_pos, '\0');
if (current_pos == NULL) {
ret = ESPIPE;
goto done;
}
/* go to the start of the next element (one char past \0) */
current_pos++;
} while (*current_pos != '\0');
} else {
/* special case for empty arrays - go one char past \0 */
current_pos++;
}
/* go to the next array */
current_pos++;
if (_count != NULL) {
*_count = count;
}
*_array = talloc_steal(mem_ctx, array);
*_end_pos = current_pos - query;
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
/*
* Appends null-terminated string array.
*/
int sudosrv_response_append_array(TALLOC_CTX *mem_ctx,
char **array,
uint8_t **_response,
size_t *_response_length)
{
size_t response_length = *_response_length;
uint8_t *response = *_response;
TALLOC_CTX *tmp_ctx = NULL;
char **iter = NULL;
int ret = EOK;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed"));
ret = ENOMEM;
goto done;
}
if (array == NULL || *array == NULL) {
/* empty array - append two \0 */
ret = sudosrv_response_append_string(tmp_ctx, "\0\0", 2,
&response, &response_length);
if (ret != EOK) {
goto done;
}
} else {
for (iter = array; *iter != NULL; iter++) {
/* append element with ending \0 */
ret = sudosrv_response_append_string(tmp_ctx, *iter,
strlen(*iter) + 1,
&response, &response_length);
if (ret != EOK) {
goto done;
}
}
/* append \0 to mark end of this array */
ret = sudosrv_response_append_string(tmp_ctx, "\0", 1,
&response, &response_length);
if (ret != EOK) {
goto done;
}
}
*_response_length = response_length;
*_response = talloc_steal(mem_ctx, response);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
int sudosrv_response_append_string(TALLOC_CTX *mem_ctx,
const char *str,
size_t str_length,
uint8_t **_response,
size_t *_response_length)
{
size_t response_length = *_response_length;
uint8_t *response = *_response;
response = talloc_realloc(mem_ctx, response, uint8_t,
response_length + (str_length * sizeof(char)));
if (response == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
return ENOMEM;
}
memcpy(response + response_length, str, str_length);
response_length += str_length;
*_response = response;
*_response_length = response_length;
return EOK;
}
int sudosrv_response_append_int(TALLOC_CTX *mem_ctx,
int number,
uint8_t **_response,
size_t *_response_length)
{
size_t response_length = *_response_length;
uint8_t *response = *_response;
response = talloc_realloc(mem_ctx, response, uint8_t,
response_length + sizeof(int));
if (response == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
return ENOMEM;
}
SAFEALIGN_SET_VALUE(response + response_length,
number, int, &response_length);
*_response = response;
*_response_length = response_length;
return EOK;
}
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