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|
/*
* Unix SMB/CIFS implementation.
* libsmbconf - Samba configuration library, simple text backend
* Copyright (C) Michael Adam 2008
*
* 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/>.
*/
/*
* This is a sample implementation of a libsmbconf text backend
* using the params.c parser.
*
* It is read only.
* Don't expect brilliant performance, since it is not hashing the lists.
*/
#include "includes.h"
#include "smbconf_private.h"
struct txt_cache {
uint32_t current_share;
uint32_t num_shares;
char **share_names;
uint32_t *num_params;
char ***param_names;
char ***param_values;
};
struct txt_private_data {
struct txt_cache *cache;
uint64_t csn;
bool verbatim;
};
/**********************************************************************
*
* helper functions
*
**********************************************************************/
/**
* a convenience helper to cast the private data structure
*/
static struct txt_private_data *pd(struct smbconf_ctx *ctx)
{
return (struct txt_private_data *)(ctx->data);
}
static bool smbconf_txt_do_section(const char *section, void *private_data)
{
WERROR werr;
uint32_t idx;
struct txt_private_data *tpd = (struct txt_private_data *)private_data;
struct txt_cache *cache = tpd->cache;
if (smbconf_find_in_array(section, cache->share_names,
cache->num_shares, &idx))
{
cache->current_share = idx;
return true;
}
werr = smbconf_add_string_to_array(cache, &(cache->share_names),
cache->num_shares, section);
if (!W_ERROR_IS_OK(werr)) {
return false;
}
cache->current_share = cache->num_shares;
cache->num_shares++;
cache->param_names = TALLOC_REALLOC_ARRAY(cache,
cache->param_names,
char **,
cache->num_shares);
if (cache->param_names == NULL) {
return false;
}
cache->param_names[cache->current_share] = NULL;
cache->param_values = TALLOC_REALLOC_ARRAY(cache,
cache->param_values,
char **,
cache->num_shares);
if (cache->param_values == NULL) {
return false;
}
cache->param_values[cache->current_share] = NULL;
cache->num_params = TALLOC_REALLOC_ARRAY(cache,
cache->num_params,
uint32_t,
cache->num_shares);
if (cache->num_params == NULL) {
return false;
}
cache->num_params[cache->current_share] = 0;
return true;
}
static bool smbconf_txt_do_parameter(const char *param_name,
const char *param_value,
void *private_data)
{
WERROR werr;
char **param_names, **param_values;
uint32_t num_params;
uint32_t idx;
struct txt_private_data *tpd = (struct txt_private_data *)private_data;
struct txt_cache *cache = tpd->cache;
if (cache->num_shares == 0) {
/* not in any share ... */
return false;
}
param_names = cache->param_names[cache->current_share];
param_values = cache->param_values[cache->current_share];
num_params = cache->num_params[cache->current_share];
if (!(tpd->verbatim) &&
smbconf_find_in_array(param_name, param_names, num_params, &idx))
{
TALLOC_FREE(param_values[idx]);
param_values[idx] = talloc_strdup(cache, param_value);
if (param_values[idx] == NULL) {
return false;
}
return true;
}
werr = smbconf_add_string_to_array(cache,
&(cache->param_names[cache->current_share]),
num_params, param_name);
if (!W_ERROR_IS_OK(werr)) {
return false;
}
werr = smbconf_add_string_to_array(cache,
&(cache->param_values[cache->current_share]),
num_params, param_value);
cache->num_params[cache->current_share]++;
return W_ERROR_IS_OK(werr);
}
static void smbconf_txt_flush_cache(struct smbconf_ctx *ctx)
{
TALLOC_FREE(pd(ctx)->cache);
}
static WERROR smbconf_txt_init_cache(struct smbconf_ctx *ctx)
{
if (pd(ctx)->cache != NULL) {
smbconf_txt_flush_cache(ctx);
}
pd(ctx)->cache = TALLOC_ZERO_P(pd(ctx), struct txt_cache);
if (pd(ctx)->cache == NULL) {
return WERR_NOMEM;
}
return WERR_OK;
}
static WERROR smbconf_txt_load_file(struct smbconf_ctx *ctx)
{
WERROR werr;
uint64_t new_csn;
if (!file_exist(ctx->path, NULL)) {
return WERR_BADFILE;
}
new_csn = (uint64_t)file_modtime(ctx->path);
if (new_csn == pd(ctx)->csn) {
return WERR_OK;
}
werr = smbconf_txt_init_cache(ctx);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
if (!pm_process(ctx->path, smbconf_txt_do_section,
smbconf_txt_do_parameter, pd(ctx)))
{
return WERR_CAN_NOT_COMPLETE;
}
pd(ctx)->csn = new_csn;
return WERR_OK;
}
/**********************************************************************
*
* smbconf operations: simple text implementations
*
**********************************************************************/
/**
* initialize the text based smbconf backend
*/
static WERROR smbconf_txt_init(struct smbconf_ctx *ctx, const char *path)
{
if (path == NULL) {
path = get_dyn_CONFIGFILE();
}
ctx->path = talloc_strdup(ctx, path);
if (ctx->path == NULL) {
return WERR_NOMEM;
}
ctx->data = TALLOC_ZERO_P(ctx, struct txt_private_data);
return WERR_OK;
}
static int smbconf_txt_shutdown(struct smbconf_ctx *ctx)
{
return ctx->ops->close_conf(ctx);
}
static WERROR smbconf_txt_open(struct smbconf_ctx *ctx)
{
return smbconf_txt_load_file(ctx);
}
static int smbconf_txt_close(struct smbconf_ctx *ctx)
{
smbconf_txt_flush_cache(ctx);
return 0;
}
/**
* Get the change sequence number of the given service/parameter.
* service and parameter strings may be NULL.
*/
static void smbconf_txt_get_csn(struct smbconf_ctx *ctx,
struct smbconf_csn *csn,
const char *service, const char *param)
{
if (csn == NULL) {
return;
}
csn->csn = (uint64_t)file_modtime(ctx->path);
}
/**
* Drop the whole configuration (restarting empty)
*/
static WERROR smbconf_txt_drop(struct smbconf_ctx *ctx)
{
return WERR_NOT_SUPPORTED;
}
/**
* get the list of share names defined in the configuration.
*/
static WERROR smbconf_txt_get_share_names(struct smbconf_ctx *ctx,
TALLOC_CTX *mem_ctx,
uint32_t *num_shares,
char ***share_names)
{
uint32_t count;
uint32_t added_count = 0;
TALLOC_CTX *tmp_ctx = NULL;
WERROR werr = WERR_OK;
char **tmp_share_names = NULL;
if ((num_shares == NULL) || (share_names == NULL)) {
werr = WERR_INVALID_PARAM;
goto done;
}
werr = smbconf_txt_load_file(ctx);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
tmp_ctx = talloc_stackframe();
if (tmp_ctx == NULL) {
werr = WERR_NOMEM;
goto done;
}
/* make sure "global" is always listed first */
if (smbconf_share_exists(ctx, GLOBAL_NAME)) {
werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
0, GLOBAL_NAME);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
added_count++;
}
for (count = 0; count < pd(ctx)->cache->num_shares; count++) {
if (strequal(pd(ctx)->cache->share_names[count], GLOBAL_NAME)) {
continue;
}
werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
added_count,
pd(ctx)->cache->share_names[count]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
added_count++;
}
*num_shares = added_count;
if (added_count > 0) {
*share_names = talloc_move(mem_ctx, &tmp_share_names);
} else {
*share_names = NULL;
}
done:
TALLOC_FREE(tmp_ctx);
return werr;
}
/**
* check if a share/service of a given name exists
*/
static bool smbconf_txt_share_exists(struct smbconf_ctx *ctx,
const char *servicename)
{
WERROR werr;
werr = smbconf_txt_load_file(ctx);
if (!W_ERROR_IS_OK(werr)) {
return false;
}
return smbconf_find_in_array(servicename,
pd(ctx)->cache->share_names,
pd(ctx)->cache->num_shares, NULL);
}
/**
* Add a service if it does not already exist
*/
static WERROR smbconf_txt_create_share(struct smbconf_ctx *ctx,
const char *servicename)
{
return WERR_NOT_SUPPORTED;
}
/**
* get a definition of a share (service) from configuration.
*/
static WERROR smbconf_txt_get_share(struct smbconf_ctx *ctx,
TALLOC_CTX *mem_ctx,
const char *servicename,
uint32_t *num_params,
char ***param_names, char ***param_values)
{
WERROR werr;
uint32_t sidx, count;
bool found;
TALLOC_CTX *tmp_ctx = NULL;
char **tmp_param_names = NULL;
char **tmp_param_values = NULL;
werr = smbconf_txt_load_file(ctx);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
found = smbconf_find_in_array(servicename,
pd(ctx)->cache->share_names,
pd(ctx)->cache->num_shares,
&sidx);
if (!found) {
return WERR_NO_SUCH_SERVICE;
}
tmp_ctx = talloc_stackframe();
if (tmp_ctx == NULL) {
werr = WERR_NOMEM;
goto done;
}
for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
werr = smbconf_add_string_to_array(tmp_ctx,
&tmp_param_names,
count,
pd(ctx)->cache->param_names[sidx][count]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
werr = smbconf_add_string_to_array(tmp_ctx,
&tmp_param_values,
count,
pd(ctx)->cache->param_values[sidx][count]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
}
*num_params = count;
if (count > 0) {
*param_names = talloc_move(mem_ctx, &tmp_param_names);
*param_values = talloc_move(mem_ctx, &tmp_param_values);
} else {
*param_names = NULL;
*param_values = NULL;
}
done:
TALLOC_FREE(tmp_ctx);
return werr;
}
/**
* delete a service from configuration
*/
static WERROR smbconf_txt_delete_share(struct smbconf_ctx *ctx,
const char *servicename)
{
return WERR_NOT_SUPPORTED;
}
/**
* set a configuration parameter to the value provided.
*/
static WERROR smbconf_txt_set_parameter(struct smbconf_ctx *ctx,
const char *service,
const char *param,
const char *valstr)
{
return WERR_NOT_SUPPORTED;
}
/**
* get the value of a configuration parameter as a string
*/
static WERROR smbconf_txt_get_parameter(struct smbconf_ctx *ctx,
TALLOC_CTX *mem_ctx,
const char *service,
const char *param,
char **valstr)
{
WERROR werr;
bool found;
uint32_t share_index, param_index;
werr = smbconf_txt_load_file(ctx);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
found = smbconf_find_in_array(service,
pd(ctx)->cache->share_names,
pd(ctx)->cache->num_shares,
&share_index);
if (!found) {
return WERR_NO_SUCH_SERVICE;
}
found = smbconf_reverse_find_in_array(param,
pd(ctx)->cache->param_names[share_index],
pd(ctx)->cache->num_params[share_index],
¶m_index);
if (!found) {
return WERR_INVALID_PARAM;
}
*valstr = talloc_strdup(mem_ctx,
pd(ctx)->cache->param_values[share_index][param_index]);
if (*valstr == NULL) {
return WERR_NOMEM;
}
return WERR_OK;
}
/**
* delete a parameter from configuration
*/
static WERROR smbconf_txt_delete_parameter(struct smbconf_ctx *ctx,
const char *service,
const char *param)
{
return WERR_NOT_SUPPORTED;
}
static WERROR smbconf_txt_get_includes(struct smbconf_ctx *ctx,
TALLOC_CTX *mem_ctx,
const char *service,
uint32_t *num_includes,
char ***includes)
{
WERROR werr;
bool found;
uint32_t sidx, count;
TALLOC_CTX *tmp_ctx = NULL;
uint32_t tmp_num_includes = 0;
char **tmp_includes = NULL;
werr = smbconf_txt_load_file(ctx);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
found = smbconf_find_in_array(service,
pd(ctx)->cache->share_names,
pd(ctx)->cache->num_shares,
&sidx);
if (!found) {
return WERR_NO_SUCH_SERVICE;
}
tmp_ctx = talloc_stackframe();
for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
if (strequal(pd(ctx)->cache->param_names[sidx][count],
"include"))
{
werr = smbconf_add_string_to_array(tmp_ctx,
&tmp_includes,
tmp_num_includes,
pd(ctx)->cache->param_values[sidx][count]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
tmp_num_includes++;
}
}
*num_includes = tmp_num_includes;
if (*num_includes > 0) {
*includes = talloc_move(mem_ctx, &tmp_includes);
if (*includes == NULL) {
werr = WERR_NOMEM;
goto done;
}
} else {
*includes = NULL;
}
werr = WERR_OK;
done:
TALLOC_FREE(tmp_ctx);
return werr;
}
static WERROR smbconf_txt_set_includes(struct smbconf_ctx *ctx,
const char *service,
uint32_t num_includes,
const char **includes)
{
return WERR_NOT_SUPPORTED;
}
static WERROR smbconf_txt_delete_includes(struct smbconf_ctx *ctx,
const char *service)
{
return WERR_NOT_SUPPORTED;
}
static struct smbconf_ops smbconf_ops_txt = {
.init = smbconf_txt_init,
.shutdown = smbconf_txt_shutdown,
.open_conf = smbconf_txt_open,
.close_conf = smbconf_txt_close,
.get_csn = smbconf_txt_get_csn,
.drop = smbconf_txt_drop,
.get_share_names = smbconf_txt_get_share_names,
.share_exists = smbconf_txt_share_exists,
.create_share = smbconf_txt_create_share,
.get_share = smbconf_txt_get_share,
.delete_share = smbconf_txt_delete_share,
.set_parameter = smbconf_txt_set_parameter,
.get_parameter = smbconf_txt_get_parameter,
.delete_parameter = smbconf_txt_delete_parameter,
.get_includes = smbconf_txt_get_includes,
.set_includes = smbconf_txt_set_includes,
.delete_includes = smbconf_txt_delete_includes,
};
/**
* initialize the smbconf text backend
* the only function that is exported from this module
*/
WERROR smbconf_init_txt_simple(TALLOC_CTX *mem_ctx,
struct smbconf_ctx **conf_ctx,
const char *path)
{
WERROR werr;
werr = smbconf_init_internal(mem_ctx, conf_ctx, path, &smbconf_ops_txt);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
pd(*conf_ctx)->verbatim = true;
return smbconf_txt_load_file(*conf_ctx);
}
|