mirror of https://gerrit.osmocom.org/asn1c
367 lines
8.2 KiB
C
367 lines
8.2 KiB
C
#include "asn1fix_internal.h"
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static asn1p_expr_t *asn1f_find_terminal_thing(arg_t *arg, asn1p_expr_t *expr, asn1p_module_t **optm, int type_or_value);
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static int asn1f_compatible_with_exports(arg_t *arg, asn1p_module_t *mod, const char *name);
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/*
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* Lookup a child by its name.
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*/
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asn1p_expr_t *
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asn1f_lookup_child(asn1p_expr_t *tc, const char *name) {
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asn1p_expr_t *child_tc;
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TQ_FOR(child_tc, &(tc->members), next) {
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if(child_tc->Identifier
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&& strcmp(child_tc->Identifier, name) == 0) {
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return child_tc;
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}
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}
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errno = ESRCH;
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return NULL;
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}
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asn1p_module_t *
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asn1f_lookup_in_imports(arg_t *arg, const char *name) {
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asn1p_module_t *mod;
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asn1p_xports_t *xp;
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asn1p_expr_t *tc;
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/*
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* Search in which exactly module this name is defined.
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*/
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TQ_FOR(xp, &(arg->mod->imports), xp_next) {
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TQ_FOR(tc, &(xp->members), next) {
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if(strcmp(name, tc->Identifier) == 0)
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break;
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}
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if(tc) break;
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}
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if(xp == NULL) {
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errno = ESRCH;
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return NULL;
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}
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/*
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* Okay, right now we have a module name and, hopefully, an OID.
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* Search the arg->asn for the specified module.
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*/
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mod = asn1f_lookup_module(arg, xp->from, xp->from_oid);
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if(mod == NULL) {
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/* ENOENT/ETOOMANYREFS */
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return NULL;
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}
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/*
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* Check that the EXPORTS section of this module contains
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* the symbol we care about, or it is EXPORTS ALL.
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*/
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if(asn1f_compatible_with_exports(arg, mod, name)) {
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errno = EPERM;
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return NULL;
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}
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return mod;
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}
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asn1p_module_t *
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asn1f_lookup_module(arg_t *arg, const char *module_name, asn1p_oid_t *oid) {
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asn1p_module_t *mod;
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assert(module_name);
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/*
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* If OID is given, the module_name is unused.
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* If OID is not given, the module_name may mean
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* either the real module's name, or the symbol which is the
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* result of renaming. Check this first.
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*/
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if(oid == 0) {
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asn1p_xports_t *xp;
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/*
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* Check inside the IMPORTS section for possible renaming.
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* Renaming practically means that a module_name is mentioned
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* somewhere in the IMPORTS section AND OID is given.
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*/
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TQ_FOR(xp, &(arg->mod->imports), xp_next) {
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if(strcmp(module_name, xp->from))
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continue;
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if(oid) {
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FATAL("Ambiguous reference: "
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"%s "
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"matches several modules",
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module_name);
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errno = ETOOMANYREFS;
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return NULL;
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}
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/*
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* Yes, there is a renaming.
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* Make lookup use OID instead.
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*/
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oid = xp->from_oid;
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}
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}
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/*
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* Perform lookup using OID or module_name.
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*/
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TQ_FOR(mod, &(arg->asn->modules), mod_next) {
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if(oid) {
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if(mod->module_oid) {
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if(asn1p_oid_compare(oid,
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mod->module_oid)) {
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continue;
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} else {
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/* Match! Even if name doesn't. */
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return mod;
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}
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} else {
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/* Not match, even if name is the same. */
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continue;
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}
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}
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if(strcmp(module_name, mod->Identifier) == 0)
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return mod;
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}
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DEBUG("\tModule \"%s\" not found", module_name);
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errno = ENOENT;
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return NULL;
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}
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asn1p_expr_t *
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asn1f_lookup_symbol(arg_t *arg, asn1p_ref_t *ref, asn1p_module_t **module_r) {
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asn1p_expr_t *ref_tc; /* Referenced tc */
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asn1p_module_t *src_mod;
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char *modulename;
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char *identifier;
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/*
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* First of all, a reference to a symbol may be specified
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* using several possible forms:
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* a) simple identifier
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* v INTEGER ::= value
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* b) external reference
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* v INTEGER ::= Module1.value
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* c) class-related stuff (the most complex stuff)
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* v ::= <[A-Z][A-Z0-9a-z-]*>.&<[A-Z0-9a-z-]+>.
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* All other forms are not implemented at this moment.
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*/
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DEBUG("%s(%s) in %s for line %d", __func__,
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asn1f_printable_reference(ref),
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arg->mod->Identifier,
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ref->_lineno);
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if(ref->comp_count == 1) {
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modulename = NULL;
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identifier = ref->components[0].name;
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} else if(ref->comp_count == 2
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&& ref->components[1].name[0] != '&') {
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modulename = ref->components[0].name;
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identifier = ref->components[1].name;
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} else if(ref->comp_count > 1
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&& isupper(ref->components[0].name[0])
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&& ref->components[1].name[0] == '&') {
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asn1p_expr_t *extract;
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/*
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* This is a reference to a CLASS-related stuff.
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* Employ a separate function for that.
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*/
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extract = asn1f_class_access(arg, ref, module_r);
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return extract;
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} else {
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DEBUG("\tToo many components: %d", ref->comp_count);
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errno = EINVAL;
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return NULL;
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}
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/*
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* If module name is specified explicitly
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* OR the current module's IMPORTS clause contains the identifier,
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* fetch that module.
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*/
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if(modulename) {
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src_mod = asn1f_lookup_module(arg, modulename, 0);
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if(src_mod == NULL) {
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FATAL("Module \"%s\" "
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"mentioned at line %d is not found",
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modulename, ref->_lineno);
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return NULL;
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}
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/*
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* Check that the EXPORTS section of this module contains
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* the symbol we care about, or it is EXPORTS ALL.
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*/
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if(asn1f_compatible_with_exports(arg, src_mod, identifier)) {
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errno = EPERM;
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return NULL;
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}
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} else {
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src_mod = asn1f_lookup_in_imports(arg, identifier);
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if(src_mod == NULL && errno != ESRCH) {
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/*
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* Return only of the name was not found.
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* If module was not found or more serious error
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* encountered, just return preserving the errno.
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*/
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return NULL;
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}
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}
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if(src_mod == 0) src_mod = arg->mod;
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/*
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* Now we know where to search for a value.
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*/
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TQ_FOR(ref_tc, &(src_mod->members), next) {
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if(ref_tc->Identifier)
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if(strcmp(ref_tc->Identifier, identifier) == 0)
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break;
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}
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if(ref_tc == NULL) {
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DEBUG("Module \"%s\" does not contain \"%s\" "
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"mentioned at line %d",
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src_mod->Identifier,
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identifier,
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ref->_lineno
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);
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errno = ESRCH;
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return NULL;
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}
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if(module_r)
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*module_r = src_mod;
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return ref_tc;
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}
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asn1p_expr_t *
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asn1f_find_terminal_type(arg_t *arg, asn1p_expr_t *expr,
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asn1p_module_t **optm) {
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return asn1f_find_terminal_thing(arg, expr, optm, 0);
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}
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asn1p_expr_t *
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asn1f_find_terminal_value(arg_t *arg, asn1p_expr_t *expr,
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asn1p_module_t **optm) {
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return asn1f_find_terminal_thing(arg, expr, optm, 1);
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}
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static asn1p_expr_t *
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asn1f_find_terminal_thing(arg_t *arg, asn1p_expr_t *expr,
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asn1p_module_t **optm, int type_or_value) {
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asn1p_module_t *mod;
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asn1p_ref_t *ref;
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asn1p_expr_t *tc;
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if(type_or_value) {
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/* VALUE */
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assert(expr->meta_type == AMT_VALUE);
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assert(expr->value);
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if(expr->value->type != ATV_REFERENCED) {
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/* Expression is a terminal value itself */
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if(optm) *optm = arg->mod;
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return expr;
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}
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ref = expr->value->value.reference;
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} else {
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/* TYPE */
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if(expr->expr_type != A1TC_REFERENCE) {
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/* Expression is a terminal type itself */
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if(optm) *optm = arg->mod;
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return expr;
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}
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ref = expr->reference;
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}
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DEBUG("%s:%s(%s->%s) for line %d",
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__func__, type_or_value?"VALUE":"TYPE",
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expr->Identifier, asn1f_printable_reference(ref),
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expr->_lineno);
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assert(ref);
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/*
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* Lookup inside the type itself (ENUMERATED, INTEGER, etc).
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*/
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if(type_or_value) {
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asn1p_expr_t *val_type_tc;
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val_type_tc = asn1f_find_terminal_type(arg, expr, 0);
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if(val_type_tc
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&& asn1f_look_value_in_type(arg, val_type_tc, expr))
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return NULL;
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if(expr->value->type != ATV_REFERENCED) {
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if(optm) *optm = arg->mod;
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return expr;
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}
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assert(ref == expr->value->value.reference);
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ref = expr->value->value.reference;
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}
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/*
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* Lookup inside the default module.
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*/
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tc = asn1f_lookup_symbol(arg, ref, &mod);
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if(tc == NULL) {
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DEBUG("\tSymbol \"%s\" not found",
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asn1f_printable_reference(ref));
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return NULL;
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}
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/*
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* Recursive loops detection.
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*/
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if(tc->_mark & TM_RECURSION) {
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DEBUG("Recursion loop detected for %s at line %d",
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asn1f_printable_reference(ref), ref->_lineno);
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errno = EPERM;
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return NULL;
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}
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tc->_mark |= TM_RECURSION;
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WITH_MODULE(mod,
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expr = asn1f_find_terminal_thing(arg, tc, optm, type_or_value));
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tc->_mark &= ~TM_RECURSION;
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return expr;
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}
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/*
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* Make sure that the specified name is present or otherwise does
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* not contradict with the EXPORTS clause of the specified module.
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*/
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static int
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asn1f_compatible_with_exports(arg_t *arg, asn1p_module_t *mod, const char *name) {
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asn1p_xports_t *exports;
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asn1p_expr_t *item;
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assert(mod);
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assert(name);
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exports = TQ_FIRST(&(mod->exports));
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if(exports == NULL) {
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/* No EXPORTS section or EXPORTS ALL; */
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return 0;
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}
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TQ_FOR(item, &(exports->members), next) {
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if(strcmp(item->Identifier, name) == 0)
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return 0;
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}
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DEBUG("Symbol \"%s\" contradicts with EXPORTS of module %s",
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name, mod->Identifier);
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errno = ESRCH;
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return -1;
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}
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