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cfg_script.c
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/*
* Copyright (C) 2008 iptelorg GmbH
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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 2 of the License, or
* (at your option) any later version
*
* Kamailio 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <string.h>
#include "../mem/mem.h"
#include "../ut.h"
#include "cfg_struct.h"
#include "cfg.h"
#include "cfg_ctx.h"
#include "cfg_script.h"
/* allocates memory for a new config script variable
* The value of the variable is not set!
*/
cfg_script_var_t *new_cfg_script_var(char *gname, char *vname, unsigned int type,
char *descr)
{
cfg_group_t *group;
cfg_script_var_t *var;
int gname_len, vname_len, descr_len;
LOG(L_DBG, "DEBUG: new_cfg_script_var(): declaring %s.%s\n", gname, vname);
if (cfg_shmized) {
LOG(L_ERR, "ERROR: new_cfg_script_var(): too late variable declaration, "
"the config has been already shmized\n");
return NULL;
}
gname_len = strlen(gname);
vname_len = strlen(vname);
/* the group may have been already declared */
group = cfg_lookup_group(gname, gname_len);
if (group) {
if (group->dynamic == CFG_GROUP_STATIC) {
/* the group has been already declared by a module or by the core */
LOG(L_ERR, "ERROR: new_cfg_script_var(): "
"configuration group has been already declared: %s\n",
gname);
return NULL;
}
/* the dynamic or empty group is found */
/* verify that the variable does not exist */
for ( var = (cfg_script_var_t *)group->vars;
var;
var = var->next
) {
if ((var->name_len == vname_len) &&
(memcmp(var->name, vname, vname_len) == 0)) {
LOG(L_ERR, "ERROR: new_cfg_script_var(): variable already exists: %s.%s\n",
gname, vname);
return NULL;
}
}
if (group->dynamic == CFG_GROUP_UNKNOWN)
group->dynamic = CFG_GROUP_DYNAMIC;
} else {
/* create a new group with NULL values, we will fix it later,
when all the variables are known */
group = cfg_new_group(gname, gname_len,
0 /* num */, NULL /* mapping */,
NULL /* vars */, 0 /* size */, NULL /* handle */);
if (!group) goto error;
group->dynamic = CFG_GROUP_DYNAMIC;
}
switch (type) {
case CFG_VAR_INT:
group->size = ROUND_INT(group->size);
group->size += sizeof(int);
break;
case CFG_VAR_STR:
group->size = ROUND_POINTER(group->size);
group->size += sizeof(str);
break;
default:
LOG(L_ERR, "ERROR: new_cfg_script_var(): unsupported variable type\n");
return NULL;
}
group->num++;
if (group->num > CFG_MAX_VAR_NUM) {
LOG(L_ERR, "ERROR: new_cfg_script_var(): too many variables (%d) within a single group,"
" the limit is %d. Increase CFG_MAX_VAR_NUM, or split the group into multiple"
" definitions.\n",
group->num, CFG_MAX_VAR_NUM);
return NULL;
}
var = (cfg_script_var_t *)pkg_malloc(sizeof(cfg_script_var_t));
if (!var) goto error;
memset(var, 0, sizeof(cfg_script_var_t));
var->type = type;
/* add the variable to the group */
var->next = (cfg_script_var_t *)(void *)group->vars;
group->vars = (char *)(void *)var;
/* clone the name of the variable */
var->name = (char *)pkg_malloc(sizeof(char) * (vname_len + 1));
if (!var->name) goto error;
memcpy(var->name, vname, vname_len + 1);
var->name_len = vname_len;
if (descr) {
/* save the description */
descr_len = strlen(descr);
var->descr = (char *)pkg_malloc(sizeof(char) * (descr_len + 1));
if (!var->descr) goto error;
memcpy(var->descr, descr, descr_len + 1);
}
return var;
error:
LOG(L_ERR, "ERROR: new_cfg_script_var(): not enough memory\n");
return NULL;
}
/* Rewrite the value of an already declared script variable before forking.
* Return value:
* 0: success
* -1: error
* 1: variable not found
*/
int cfg_set_script_var(cfg_group_t *group, str *var_name,
void *val, unsigned int val_type)
{
cfg_script_var_t *var;
void *v;
str s;
if (cfg_shmized || (group->dynamic != CFG_GROUP_DYNAMIC)) {
LOG(L_ERR, "BUG: cfg_set_script_var(): Not a dynamic group before forking\n");
return -1;
}
for ( var = (cfg_script_var_t *)(void *)group->vars;
var;
var = var->next
) {
if ((var->name_len == var_name->len)
&& (memcmp(var->name, var_name->s, var_name->len) == 0)
) {
switch (var->type) {
case CFG_VAR_INT:
if (convert_val(val_type, val, CFG_INPUT_INT, &v))
goto error;
if ((var->min || var->max)
&& ((var->min > (int)(long)v) || (var->max < (int)(long)v))
) {
LOG(L_ERR, "ERROR: cfg_set_script_var(): integer value is out of range\n");
goto error;
}
var->val.i = (int)(long)v;
break;
case CFG_VAR_STR:
if (convert_val(val_type, val, CFG_INPUT_STR, &v))
goto error;
if (((str *)v)->s) {
s.len = ((str *)v)->len;
s.s = pkg_malloc(sizeof(char) * (s.len + 1));
if (!s.s) {
LOG(L_ERR, "ERROR: cfg_set_script_var(): not enough memory\n");
goto error;
}
memcpy(s.s, ((str *)v)->s, s.len);
s.s[s.len] = '\0';
} else {
s.s = NULL;
s.len = 0;
}
if (var->val.s.s)
pkg_free(var->val.s.s);
var->val.s = s;
break;
default:
LOG(L_ERR, "ERROR: cfg_set_script_var(): unsupported variable type\n");
goto error;
}
convert_val_cleanup();
return 0;
}
}
return 1;
error:
LOG(L_ERR, "ERROR: cfg_set_script_var(): failed to set the script variable: %.*s.%.*s\n",
group->name_len, group->name,
var_name->len, var_name->s);
return -1;
}
/* fix-up the dynamically declared group:
* - allocate memory for the arrays
* - set the values within the memory block
*/
int cfg_script_fixup(cfg_group_t *group, unsigned char *block)
{
cfg_mapping_t *mapping = NULL;
cfg_def_t *def = NULL;
void **handle = NULL;
int i, offset;
cfg_script_var_t *script_var, *script_var2;
str s;
mapping = (cfg_mapping_t *)pkg_malloc(sizeof(cfg_mapping_t)*group->num);
if (!mapping) goto error;
memset(mapping, 0, sizeof(cfg_mapping_t)*group->num);
/* The variable definition array must look like as if it was declared
* in C code, thus, add an additional slot at the end with NULL values */
def = (cfg_def_t *)pkg_malloc(sizeof(cfg_def_t)*(group->num + 1));
if (!def) goto error;
memset(def, 0, sizeof(cfg_def_t)*(group->num + 1));
/* fill the definition and the mapping arrays */
offset = 0;
for ( i = 0, script_var = (cfg_script_var_t *)group->vars;
script_var;
i++, script_var = script_var->next
) {
/* there has been already memory allocated for the name */
def[i].name = script_var->name;
def[i].type = script_var->type | (script_var->type << CFG_INPUT_SHIFT);
def[i].descr = script_var->descr;
def[i].min = script_var->min;
def[i].max = script_var->max;
mapping[i].def = &(def[i]);
mapping[i].name_len = script_var->name_len;
mapping[i].pos = i;
switch (script_var->type) {
case CFG_VAR_INT:
offset = ROUND_INT(offset);
mapping[i].offset = offset;
*(int *)(block + offset) = script_var->val.i;
offset += sizeof(int);
break;
case CFG_VAR_STR:
offset = ROUND_POINTER(offset);
mapping[i].offset = offset;
if (cfg_clone_str(&(script_var->val.s), &s)) goto error;
memcpy(block + offset, &s, sizeof(str));
mapping[i].flag |= cfg_var_shmized;
offset += sizeof(str);
break;
}
}
/* allocate a handle even if it will not be used to
directly access the variable, like handle->variable
cfg_get_* functions access the memory block via the handle
to make sure that it is always safe, thus, it must be created */
handle = (void **)pkg_malloc(sizeof(void *));
if (!handle) goto error;
*handle = NULL;
group->handle = handle;
group->mapping = mapping;
/* everything went fine, we can free the temporary list */
script_var = (cfg_script_var_t *)group->vars;
group->vars = NULL;
while (script_var) {
script_var2 = script_var->next;
if ((script_var->type == CFG_VAR_STR) && script_var->val.s.s)
pkg_free(script_var->val.s.s);
pkg_free(script_var);
script_var = script_var2;
}
return 0;
error:
if (mapping) pkg_free(mapping);
if (def) pkg_free(def);
if (handle) pkg_free(handle);
LOG(L_ERR, "ERROR: cfg_script_fixup(): not enough memory\n");
return -1;
}
/* destory a dynamically allocated group definition */
void cfg_script_destroy(cfg_group_t *group)
{
int i;
cfg_script_var_t *script_var, *script_var2;
if (group->mapping && group->mapping->def) {
for (i=0; i<group->num; i++) {
if (group->mapping->def[i].name)
pkg_free(group->mapping->def[i].name);
if (group->mapping->def[i].descr)
pkg_free(group->mapping->def[i].descr);
}
pkg_free(group->mapping->def);
}
if (group->mapping) pkg_free(group->mapping);
if (group->handle) pkg_free(group->handle);
/* it may happen that the temporary var list
still exists because the fixup failed and did not complete */
script_var = (cfg_script_var_t *)group->vars;
while (script_var) {
script_var2 = script_var->next;
if ((script_var->type == CFG_VAR_STR) && script_var->val.s.s)
pkg_free(script_var->val.s.s);
pkg_free(script_var);
script_var = script_var2;
}
}