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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 "config.h"
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdint.h>
#include "sss_client/sss_cli.h"
#include "sss_client/sudo/sss_sudo.h"
#include "sss_client/sudo/sss_sudo_private.h"
static int sss_sudo_parse_rule(const char *message,
size_t message_len,
size_t *_cursor,
struct sss_sudo_rule *_rule);
static int sss_sudo_parse_attr(const char *message,
size_t message_len,
size_t *_cursor,
struct sss_sudo_attr *_attr);
static int sss_sudo_parse_uint32(const char *message,
size_t message_len,
size_t *_cursor,
uint32_t *_number);
static int sss_sudo_parse_string(const char *message,
size_t message_len,
size_t *_cursor,
char **_str);
int sss_sudo_parse_response(const char *message,
size_t message_len,
char **_domainname,
struct sss_sudo_result **_result,
uint32_t *_error)
{
struct sss_sudo_result *result = NULL;
char *domainname = NULL;
size_t cursor = 0;
int ret = EOK;
int i = 0;
/* error code */
ret = sss_sudo_parse_uint32(message, message_len, &cursor, _error);
if (ret != EOK || *_error != SSS_SUDO_ERROR_OK) {
return ret;
}
/* domain name - deprecated
* it won't be used, but we will read it anyway to ease parsing
* TODO: when possible change the protocol */
ret = sss_sudo_parse_string(message, message_len, &cursor, &domainname);
if (ret != EOK) {
return ret;
}
free(domainname);
if (_domainname != NULL) {
*_domainname = NULL;
}
/* result */
result = malloc(sizeof(struct sss_sudo_result));
if (result == NULL) {
return ENOMEM;
}
memset(result, 0, sizeof(struct sss_sudo_result));
/* rules_num */
ret = sss_sudo_parse_uint32(message, message_len,
&cursor, &result->num_rules);
if (ret != EOK) {
goto fail;
}
/* rules */
result->rules = calloc(result->num_rules, sizeof(struct sss_sudo_rule));
if (result->rules == NULL) {
ret = ENOMEM;
goto fail;
}
for (i = 0; i < result->num_rules; i++) {
ret = sss_sudo_parse_rule(message, message_len,
&cursor, &result->rules[i]);
if (ret != EOK) {
goto fail;
}
}
*_result = result;
return EOK;
fail:
sss_sudo_free_result(result);
return ret;
}
int sss_sudo_parse_rule(const char *message,
size_t message_len,
size_t *_cursor,
struct sss_sudo_rule *_rule)
{
int ret = EOK;
int i = 0;
/* attrs_num */
ret = sss_sudo_parse_uint32(message, message_len,
_cursor, &_rule->num_attrs);
if (ret != EOK) {
return ret;
}
/* attrs */
_rule->attrs = calloc(_rule->num_attrs, sizeof(struct sss_sudo_attr));
if (_rule->attrs == NULL) {
return ENOMEM;
}
for (i = 0; i < _rule->num_attrs; i++) {
ret = sss_sudo_parse_attr(message, message_len,
_cursor, &_rule->attrs[i]);
if (ret != EOK) {
return ret;
}
}
return EOK;
}
int sss_sudo_parse_attr(const char *message,
size_t message_len,
size_t *_cursor,
struct sss_sudo_attr *_attr)
{
char *str = NULL;
int ret = EOK;
int i = 0;
/* name */
ret = sss_sudo_parse_string(message, message_len, _cursor, &str);
if (ret != EOK) {
return ret;
}
_attr->name = str;
/* values_num */
ret = sss_sudo_parse_uint32(message, message_len,
_cursor, &_attr->num_values);
if (ret != EOK) {
return ret;
}
/* values */
_attr->values = calloc(_attr->num_values, sizeof(const char*));
if (_attr->values == NULL) {
return ENOMEM;
}
for (i = 0; i < _attr->num_values; i++) {
ret = sss_sudo_parse_string(message, message_len, _cursor, &str);
if (ret != EOK) {
return ret;
}
_attr->values[i] = str;
}
return EOK;
}
int sss_sudo_parse_uint32(const char *message,
size_t message_len,
size_t *_cursor,
uint32_t *_number)
{
size_t start_pos = 0;
if (_cursor == NULL) {
return EINVAL;
}
start_pos = *_cursor;
if (start_pos + sizeof(uint32_t) > message_len) {
return EINVAL;
}
/* expanded SAFEALIGN_COPY_UINT32 macro from util.h */
memcpy(_number, message + start_pos, sizeof(uint32_t));
*_cursor = start_pos + sizeof(uint32_t);
return EOK;
}
int sss_sudo_parse_string(const char *message,
size_t message_len,
size_t *_cursor,
char **_str)
{
const char *current = NULL;
char *str = NULL;
size_t start_pos = 0;
size_t len = 0;
size_t maxlen = 0;
if (_cursor == NULL) {
return EINVAL;
}
start_pos = *_cursor;
maxlen = message_len - start_pos;
if (start_pos >= message_len ) {
return EINVAL;
}
current = message + start_pos;
len = strnlen(current, maxlen);
if (len == maxlen) {
/* the string exceeds message length */
return EINVAL;
}
str = strndup(current, len);
if (str == NULL) {
return ENOMEM;
}
/* go after \0 */
*_cursor = start_pos + len + 1;
*_str = str;
return EOK;
}
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