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/* Copyright (c) 2002-2013 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "hash.h"
#include "str.h"
#include "array.h"
#include "sieve-common.h"
#include "sieve-ast.h"
#include "sieve-binary.h"
#include "sieve-code.h"
#include "sieve-objects.h"
#include "sieve-match-types.h"
#include "sieve-commands.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-dump.h"
#include "sieve-interpreter.h"
#include "ext-variables-common.h"
#include "ext-variables-limits.h"
#include "ext-variables-name.h"
#include "ext-variables-modifiers.h"
/*
* Limits
*/
unsigned int sieve_variables_get_max_scope_size(void)
{
return EXT_VARIABLES_MAX_SCOPE_SIZE;
}
/*
* Variable scope
*/
struct sieve_variable_scope {
pool_t pool;
int refcount;
struct sieve_instance *svinst;
const struct sieve_extension *ext;
struct sieve_variable *error_var;
HASH_TABLE(const char *, struct sieve_variable *) variables;
ARRAY(struct sieve_variable *) variable_index;
};
struct sieve_variable_scope_binary {
struct sieve_variable_scope *scope;
unsigned int size;
struct sieve_binary_block *sblock;
sieve_size_t address;
};
struct sieve_variable_scope_iter {
struct sieve_variable_scope *scope;
struct hash_iterate_context *hctx;
};
struct sieve_variable_scope *sieve_variable_scope_create
(struct sieve_instance *svinst, const struct sieve_extension *ext)
{
struct sieve_variable_scope *scope;
pool_t pool;
pool = pool_alloconly_create("sieve_variable_scope", 4096);
scope = p_new(pool, struct sieve_variable_scope, 1);
scope->pool = pool;
scope->refcount = 1;
scope->svinst = svinst;
scope->ext = ext;
hash_table_create(&scope->variables, pool, 0, strcase_hash, strcasecmp);
p_array_init(&scope->variable_index, pool, 128);
return scope;
}
void sieve_variable_scope_ref(struct sieve_variable_scope *scope)
{
scope->refcount++;
}
void sieve_variable_scope_unref(struct sieve_variable_scope **_scope)
{
struct sieve_variable_scope *scope = *_scope;
i_assert(scope->refcount > 0);
if (--scope->refcount != 0)
return;
hash_table_destroy(&scope->variables);
*_scope = NULL;
pool_unref(&scope->pool);
}
pool_t sieve_variable_scope_pool(struct sieve_variable_scope *scope)
{
return scope->pool;
}
struct sieve_variable *sieve_variable_scope_declare
(struct sieve_variable_scope *scope, const char *identifier)
{
struct sieve_variable *new_var;
new_var = p_new(scope->pool, struct sieve_variable, 1);
new_var->ext = scope->ext;
if ( array_count(&scope->variable_index) >= EXT_VARIABLES_MAX_SCOPE_SIZE ) {
if ( scope->error_var == NULL ) {
new_var->identifier = "@ERROR@";
new_var->index = 0;
scope->error_var = new_var;
return NULL;
}
return scope->error_var;
}
new_var->identifier = p_strdup(scope->pool, identifier);
new_var->index = array_count(&scope->variable_index);
hash_table_insert(scope->variables, new_var->identifier, new_var);
array_append(&scope->variable_index, &new_var, 1);
return new_var;
}
struct sieve_variable *sieve_variable_scope_get_variable
(struct sieve_variable_scope *scope, const char *identifier, bool declare)
{
struct sieve_variable *var;
var = hash_table_lookup(scope->variables, identifier);
if ( var == NULL && declare ) {
var = sieve_variable_scope_declare(scope, identifier);
}
return var;
}
struct sieve_variable *sieve_variable_scope_import
(struct sieve_variable_scope *scope, struct sieve_variable *var)
{
struct sieve_variable *new_var;
new_var = p_new(scope->pool, struct sieve_variable, 1);
memcpy(new_var, var, sizeof(struct sieve_variable));
hash_table_insert(scope->variables, new_var->identifier, new_var);
/* Not entered into the index because it is an external variable
* (This can be done unlimited; only limited by the size of the external scope)
*/
return new_var;
}
struct sieve_variable_scope_iter *sieve_variable_scope_iterate_init
(struct sieve_variable_scope *scope)
{
struct sieve_variable_scope_iter *iter;
iter = t_new(struct sieve_variable_scope_iter, 1);
iter->scope = scope;
iter->hctx = hash_table_iterate_init(scope->variables);
return iter;
}
bool sieve_variable_scope_iterate
(struct sieve_variable_scope_iter *iter, struct sieve_variable **var_r)
{
const char *key;
return hash_table_iterate
(iter->hctx, iter->scope->variables, &key, var_r);
}
void sieve_variable_scope_iterate_deinit
(struct sieve_variable_scope_iter **iter)
{
hash_table_iterate_deinit(&(*iter)->hctx);
*iter = NULL;
}
unsigned int sieve_variable_scope_declarations
(struct sieve_variable_scope *scope)
{
return hash_table_count(scope->variables);
}
unsigned int sieve_variable_scope_size
(struct sieve_variable_scope *scope)
{
return array_count(&scope->variable_index);
}
struct sieve_variable * const *sieve_variable_scope_get_variables
(struct sieve_variable_scope *scope, unsigned int *size_r)
{
return array_get(&scope->variable_index, size_r);
}
struct sieve_variable *sieve_variable_scope_get_indexed
(struct sieve_variable_scope *scope, unsigned int index)
{
struct sieve_variable * const *var;
if ( index >= array_count(&scope->variable_index) )
return NULL;
var = array_idx(&scope->variable_index, index);
return *var;
}
/* Scope binary */
struct sieve_variable_scope *sieve_variable_scope_binary_dump
(struct sieve_instance *svinst, const struct sieve_extension *ext,
const struct sieve_dumptime_env *denv, sieve_size_t *address)
{
struct sieve_variable_scope *local_scope;
unsigned int i, scope_size;
sieve_size_t pc;
sieve_offset_t end_offset;
/* Read scope size */
sieve_code_mark(denv);
if ( !sieve_binary_read_unsigned(denv->sblock, address, &scope_size) )
return FALSE;
/* Read offset */
pc = *address;
if ( !sieve_binary_read_offset(denv->sblock, address, &end_offset) )
return FALSE;
/* Create scope */
local_scope = sieve_variable_scope_create(svinst, ext);
/* Read and dump scope itself */
sieve_code_dumpf(denv, "VARIABLES SCOPE [%u] (end: %08x)",
scope_size, (unsigned int) (pc + end_offset));
for ( i = 0; i < scope_size; i++ ) {
string_t *identifier;
sieve_code_mark(denv);
if (!sieve_binary_read_string(denv->sblock, address, &identifier) ) {
return FALSE;
}
sieve_code_dumpf(denv, "%3d: '%s'", i, str_c(identifier));
(void) sieve_variable_scope_declare(local_scope, str_c(identifier));
}
return local_scope;
}
struct sieve_variable_scope_binary *sieve_variable_scope_binary_create
(struct sieve_variable_scope *scope)
{
struct sieve_variable_scope_binary *scpbin;
scpbin = p_new(scope->pool, struct sieve_variable_scope_binary, 1);
scpbin->scope = scope;
return scpbin;
}
void sieve_variable_scope_binary_ref
(struct sieve_variable_scope_binary *scpbin)
{
sieve_variable_scope_ref(scpbin->scope);
}
void sieve_variable_scope_binary_unref
(struct sieve_variable_scope_binary **scpbin)
{
sieve_variable_scope_unref(&(*scpbin)->scope);
*scpbin = NULL;
}
struct sieve_variable_scope_binary *sieve_variable_scope_binary_read
(struct sieve_instance *svinst, const struct sieve_extension *ext,
struct sieve_binary_block *sblock, sieve_size_t *address)
{
struct sieve_variable_scope *scope;
struct sieve_variable_scope_binary *scpbin;
unsigned int scope_size;
const char *ext_name =
( ext == NULL ? "variables" : sieve_extension_name(ext) );
sieve_size_t pc;
sieve_offset_t end_offset;
/* Read scope size */
if ( !sieve_binary_read_unsigned(sblock, address, &scope_size) ) {
sieve_sys_error
(svinst, "%s: variable scope: failed to read size", ext_name);
return NULL;
}
/* Check size limit */
if ( scope_size > EXT_VARIABLES_MAX_SCOPE_SIZE ) {
sieve_sys_error(svinst,
"%s: variable scope: size exceeds the limit (%u > %u)",
ext_name, scope_size, EXT_VARIABLES_MAX_SCOPE_SIZE );
return NULL;
}
/* Read offset */
pc = *address;
if ( !sieve_binary_read_offset(sblock, address, &end_offset) ) {
sieve_sys_error(svinst,
"%s: variable scope: failed to read end offset", ext_name);
return NULL;
}
/* Create scope */
scope = sieve_variable_scope_create(svinst, ext);
scpbin = sieve_variable_scope_binary_create(scope);
scpbin->size = scope_size;
scpbin->sblock = sblock;
scpbin->address = *address;
*address = pc + end_offset;
return scpbin;
}
struct sieve_variable_scope *sieve_variable_scope_binary_get
(struct sieve_variable_scope_binary *scpbin)
{
const struct sieve_extension *ext = scpbin->scope->ext;
struct sieve_instance *svinst = scpbin->scope->svinst;
const char *ext_name =
( ext == NULL ? "variables" : sieve_extension_name(ext) );
unsigned int i;
if ( scpbin->sblock != NULL ) {
sieve_size_t *address = &scpbin->address;
/* Read scope itself */
for ( i = 0; i < scpbin->size; i++ ) {
struct sieve_variable *var;
string_t *identifier;
if (!sieve_binary_read_string(scpbin->sblock, address, &identifier) ) {
sieve_sys_error(svinst,
"%s: variable scope: failed to read variable name", ext_name);
return NULL;
}
var = sieve_variable_scope_declare(scpbin->scope, str_c(identifier));
i_assert( var != NULL );
i_assert( var->index == i );
}
scpbin->sblock = NULL;
}
return scpbin->scope;
}
unsigned int sieve_variable_scope_binary_get_size
(struct sieve_variable_scope_binary *scpbin)
{
if ( scpbin->sblock != NULL )
return scpbin->size;
return array_count(&scpbin->scope->variable_index);
}
/*
* Variable storage
*/
struct sieve_variable_storage {
pool_t pool;
struct sieve_variable_scope *scope;
struct sieve_variable_scope_binary *scope_bin;
unsigned int max_size;
ARRAY(string_t *) var_values;
};
struct sieve_variable_storage *sieve_variable_storage_create
(pool_t pool, struct sieve_variable_scope_binary *scpbin)
{
struct sieve_variable_storage *storage;
storage = p_new(pool, struct sieve_variable_storage, 1);
storage->pool = pool;
storage->scope_bin = scpbin;
storage->scope = NULL;
storage->max_size = sieve_variable_scope_binary_get_size(scpbin);
p_array_init(&storage->var_values, pool, 4);
return storage;
}
static inline bool sieve_variable_valid
(struct sieve_variable_storage *storage, unsigned int index)
{
if ( storage->scope_bin == NULL )
return TRUE;
return ( index < storage->max_size );
}
bool sieve_variable_get_identifier
(struct sieve_variable_storage *storage, unsigned int index,
const char **identifier)
{
struct sieve_variable * const *var;
*identifier = NULL;
if ( storage->scope_bin == NULL )
return TRUE;
if ( storage->scope == NULL ) {
storage->scope = sieve_variable_scope_binary_get(storage->scope_bin);
if ( storage->scope == NULL ) return FALSE;
}
/* FIXME: direct invasion of the scope object is a bit ugly */
if ( index >= array_count(&storage->scope->variable_index) )
return FALSE;
var = array_idx(&storage->scope->variable_index, index);
if ( *var != NULL )
*identifier = (*var)->identifier;
return TRUE;
}
const char *sieve_variable_get_varid
(struct sieve_variable_storage *storage, unsigned int index)
{
if ( storage->scope_bin == NULL )
return t_strdup_printf("%ld", (long) index);
if ( storage->scope == NULL ) {
storage->scope = sieve_variable_scope_binary_get(storage->scope_bin);
if ( storage->scope == NULL ) return NULL;
}
return sieve_ext_variables_get_varid(storage->scope->ext, index);
}
bool sieve_variable_get
(struct sieve_variable_storage *storage, unsigned int index, string_t **value)
{
*value = NULL;
if ( index < array_count(&storage->var_values) ) {
string_t * const *varent;
varent = array_idx(&storage->var_values, index);
*value = *varent;
} else if ( !sieve_variable_valid(storage, index) )
return FALSE;
return TRUE;
}
bool sieve_variable_get_modifiable
(struct sieve_variable_storage *storage, unsigned int index, string_t **value)
{
string_t *dummy;
if ( value == NULL ) value = &dummy;
if ( !sieve_variable_get(storage, index, value) )
return FALSE;
if ( *value == NULL ) {
*value = str_new(storage->pool, 256);
array_idx_set(&storage->var_values, index, value);
}
return TRUE;
}
bool sieve_variable_assign
(struct sieve_variable_storage *storage, unsigned int index,
const string_t *value)
{
string_t *varval;
if ( !sieve_variable_get_modifiable(storage, index, &varval) )
return FALSE;
str_truncate(varval, 0);
str_append_str(varval, value);
/* Just a precaution, caller should prevent this in the first place */
if ( str_len(varval) > EXT_VARIABLES_MAX_VARIABLE_SIZE )
str_truncate(varval, EXT_VARIABLES_MAX_VARIABLE_SIZE);
return TRUE;
}
/*
* AST Context
*/
static void ext_variables_ast_free
(const struct sieve_extension *ext ATTR_UNUSED,
struct sieve_ast *ast ATTR_UNUSED, void *context)
{
struct sieve_variable_scope *local_scope =
(struct sieve_variable_scope *) context;
/* Unreference main variable scope */
sieve_variable_scope_unref(&local_scope);
}
static const struct sieve_ast_extension variables_ast_extension = {
&variables_extension,
ext_variables_ast_free
};
static struct sieve_variable_scope *ext_variables_create_local_scope
(const struct sieve_extension *this_ext, struct sieve_ast *ast)
{
struct sieve_variable_scope *scope;
scope = sieve_variable_scope_create(this_ext->svinst, NULL);
sieve_ast_extension_register
(ast, this_ext, &variables_ast_extension, (void *) scope);
return scope;
}
static struct sieve_variable_scope *ext_variables_ast_get_local_scope
(const struct sieve_extension *this_ext, struct sieve_ast *ast)
{
struct sieve_variable_scope *local_scope = (struct sieve_variable_scope *)
sieve_ast_extension_get_context(ast, this_ext);
return local_scope;
}
/*
* Validator context
*/
static struct ext_variables_validator_context *
ext_variables_validator_context_create
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
{
pool_t pool = sieve_validator_pool(valdtr);
struct ext_variables_validator_context *ctx;
struct sieve_ast *ast = sieve_validator_ast(valdtr);
ctx = p_new(pool, struct ext_variables_validator_context, 1);
ctx->modifiers = sieve_validator_object_registry_create(valdtr);
ctx->namespaces = sieve_validator_object_registry_create(valdtr);
ctx->local_scope = ext_variables_create_local_scope(this_ext, ast);
sieve_validator_extension_set_context(valdtr, this_ext, (void *) ctx);
return ctx;
}
struct ext_variables_validator_context *ext_variables_validator_context_get
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
{
struct ext_variables_validator_context *ctx =
(struct ext_variables_validator_context *)
sieve_validator_extension_get_context(valdtr, this_ext);
if ( ctx == NULL ) {
ctx = ext_variables_validator_context_create(this_ext, valdtr);
}
return ctx;
}
void ext_variables_validator_initialize
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
{
struct ext_variables_validator_context *ctx;
/* Create our context */
ctx = ext_variables_validator_context_get(this_ext, valdtr);
ext_variables_register_core_modifiers(this_ext, ctx);
ctx->active = TRUE;
}
struct sieve_variable *ext_variables_validator_get_variable
(const struct sieve_extension *this_ext, struct sieve_validator *validator,
const char *variable, bool declare)
{
struct ext_variables_validator_context *ctx =
ext_variables_validator_context_get(this_ext, validator);
return sieve_variable_scope_get_variable(ctx->local_scope, variable, declare);
}
struct sieve_variable_scope *sieve_ext_variables_get_local_scope
(const struct sieve_extension *var_ext, struct sieve_validator *validator)
{
struct ext_variables_validator_context *ctx =
ext_variables_validator_context_get(var_ext, validator);
return ctx->local_scope;
}
bool sieve_ext_variables_is_active
(const struct sieve_extension *var_ext, struct sieve_validator *valdtr)
{
struct ext_variables_validator_context *ctx =
ext_variables_validator_context_get(var_ext, valdtr);
return ( ctx != NULL && ctx->active );
}
/*
* Code generation
*/
bool ext_variables_generator_load
(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv)
{
struct sieve_variable_scope *local_scope =
ext_variables_ast_get_local_scope(ext, cgenv->ast);
unsigned int count = sieve_variable_scope_size(local_scope);
sieve_size_t jump;
sieve_binary_emit_unsigned(cgenv->sblock, count);
jump = sieve_binary_emit_offset(cgenv->sblock, 0);
if ( count > 0 ) {
unsigned int size, i;
struct sieve_variable *const *vars =
sieve_variable_scope_get_variables(local_scope, &size);
for ( i = 0; i < size; i++ ) {
sieve_binary_emit_cstring(cgenv->sblock, vars[i]->identifier);
}
}
sieve_binary_resolve_offset(cgenv->sblock, jump);
return TRUE;
}
/*
* Interpreter context
*/
struct ext_variables_interpreter_context {
pool_t pool;
struct sieve_variable_scope *local_scope;
struct sieve_variable_scope_binary *local_scope_bin;
struct sieve_variable_storage *local_storage;
ARRAY(struct sieve_variable_storage *) ext_storages;
};
static void ext_variables_interpreter_free
(const struct sieve_extension *ext ATTR_UNUSED,
struct sieve_interpreter *interp ATTR_UNUSED, void *context)
{
struct ext_variables_interpreter_context *ctx =
(struct ext_variables_interpreter_context *)context;
sieve_variable_scope_binary_unref(&ctx->local_scope_bin);
}
static struct sieve_interpreter_extension variables_interpreter_extension = {
&variables_extension,
NULL,
ext_variables_interpreter_free
};
static struct ext_variables_interpreter_context *
ext_variables_interpreter_context_create
(const struct sieve_extension *this_ext, struct sieve_interpreter *interp,
struct sieve_variable_scope_binary *scpbin)
{
pool_t pool = sieve_interpreter_pool(interp);
struct ext_variables_interpreter_context *ctx;
ctx = p_new(pool, struct ext_variables_interpreter_context, 1);
ctx->pool = pool;
ctx->local_scope = NULL;
ctx->local_scope_bin = scpbin;
ctx->local_storage = sieve_variable_storage_create(pool, scpbin);
p_array_init(&ctx->ext_storages, pool,
sieve_extensions_get_count(this_ext->svinst));
sieve_interpreter_extension_register
(interp, this_ext, &variables_interpreter_extension, (void *) ctx);
return ctx;
}
bool ext_variables_interpreter_load
(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
sieve_size_t *address)
{
struct sieve_variable_scope_binary *scpbin;
scpbin = sieve_variable_scope_binary_read
(renv->svinst, NULL, renv->sblock, address);
if ( scpbin == NULL )
return FALSE;
/* Create our context */
(void)ext_variables_interpreter_context_create
(ext, renv->interp, scpbin);
/* Enable support for match values */
(void) sieve_match_values_set_enabled(renv, TRUE);
return TRUE;
}
static inline struct ext_variables_interpreter_context *
ext_variables_interpreter_context_get
(const struct sieve_extension *this_ext, struct sieve_interpreter *interp)
{
return (struct ext_variables_interpreter_context *)
sieve_interpreter_extension_get_context(interp, this_ext);
}
struct sieve_variable_storage *sieve_ext_variables_runtime_get_storage
(const struct sieve_extension *var_ext, const struct sieve_runtime_env *renv,
const struct sieve_extension *ext)
{
struct ext_variables_interpreter_context *ctx =
ext_variables_interpreter_context_get(var_ext, renv->interp);
struct sieve_variable_storage * const *storage;
if ( ext == NULL )
return ctx->local_storage;
if ( ext->id >= (int) array_count(&ctx->ext_storages) ) {
storage = NULL;
} else {
storage = array_idx(&ctx->ext_storages, ext->id);
}
if ( storage == NULL ) return NULL;
return *storage;
}
void sieve_ext_variables_runtime_set_storage
(const struct sieve_extension *var_ext, const struct sieve_runtime_env *renv,
const struct sieve_extension *ext, struct sieve_variable_storage *storage)
{
struct ext_variables_interpreter_context *ctx =
ext_variables_interpreter_context_get(var_ext, renv->interp);
if ( ctx == NULL || ext == NULL || storage == NULL )
return;
if ( ext->id < 0 ) return;
array_idx_set(&ctx->ext_storages, (unsigned int) ext->id, &storage);
}
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