/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- * GObject introspection: typelib validation, auxiliary functions * related to the binary typelib format * * Copyright (C) 2005 Matthias Clasen * * SPDX-License-Identifier: LGPL-2.1-or-later * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include #include #include #include "gitypelib-internal.h" #include "gitypelib.h" /** * GITypelib: * * `GITypelib` represents a loaded `.typelib` file, which contains a description * of a single module’s API. * * Since: 2.80 */ G_DEFINE_BOXED_TYPE (GITypelib, gi_typelib, gi_typelib_ref, gi_typelib_unref) GIInfoType gi_typelib_blob_type_to_info_type (GITypelibBlobType blob_type) { switch (blob_type) { case BLOB_TYPE_BOXED: /* `BLOB_TYPE_BOXED` now always refers to a `StructBlob`, and * `GIRegisteredTypeInfo` (the parent type of `GIStructInfo`) has a method * for distinguishing whether the struct is a boxed type. So presenting * `BLOB_TYPE_BOXED` as its own `GIBaseInfo` subclass is not helpful. * See commit e28078c70cbf4a57c7dbd39626f43f9bd2674145 and * https://gitlab.gnome.org/GNOME/glib/-/issues/3245. */ return GI_INFO_TYPE_STRUCT; default: return (GIInfoType) blob_type; } } typedef struct { GITypelib *typelib; GSList *context_stack; } ValidateContext; #define ALIGN_VALUE(this, boundary) \ (( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1))) static void push_context (ValidateContext *ctx, const char *name) { ctx->context_stack = g_slist_prepend (ctx->context_stack, (char*)name); } static void pop_context (ValidateContext *ctx) { g_assert (ctx->context_stack != NULL); ctx->context_stack = g_slist_delete_link (ctx->context_stack, ctx->context_stack); } static gboolean validate_interface_blob (ValidateContext *ctx, uint32_t offset, GError **error); static DirEntry * get_dir_entry_checked (GITypelib *typelib, uint16_t index, GError **error) { Header *header = (Header *)typelib->data; uint32_t offset; if (index == 0 || index > header->n_entries) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid directory index %d", index); return FALSE; } offset = header->directory + (index - 1) * header->entry_blob_size; if (typelib->len < offset + sizeof (DirEntry)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } return (DirEntry *)&typelib->data[offset]; } static CommonBlob * get_blob (GITypelib *typelib, uint32_t offset, GError **error) { if (typelib->len < offset + sizeof (CommonBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } return (CommonBlob *)&typelib->data[offset]; } static InterfaceTypeBlob * get_type_blob (GITypelib *typelib, SimpleTypeBlob *simple, GError **error) { if (simple->offset == 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "Expected blob for type"); return FALSE; } if (simple->flags.reserved == 0 && simple->flags.reserved2 == 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "Expected non-basic type but got %d", simple->flags.tag); return FALSE; } return (InterfaceTypeBlob*) get_blob (typelib, simple->offset, error); } /** * gi_typelib_get_dir_entry: * @typelib: a #GITypelib * @index: index to retrieve * * Get the typelib directory entry at the given @index. * * Returns: (transfer none): a `DirEntry` * Since: 2.80 */ DirEntry * gi_typelib_get_dir_entry (GITypelib *typelib, uint16_t index) { Header *header = (Header *)typelib->data; return (DirEntry *)&typelib->data[header->directory + (index - 1) * header->entry_blob_size]; } static Section * get_section_by_id (GITypelib *typelib, SectionType section_type) { Header *header = (Header *)typelib->data; Section *section; if (header->sections == 0) return NULL; for (section = (Section*)&typelib->data[header->sections]; section->id != GI_SECTION_END; section++) { if (section->id == section_type) return section; } return NULL; } /** * gi_typelib_get_dir_entry_by_name: * @typelib: a #GITypelib * @name: name to look up * * Get the typelib directory entry which has @name. * * Returns: (transfer none) (nullable): entry corresponding to @name, or `NULL` * if none was found * Since: 2.80 */ DirEntry * gi_typelib_get_dir_entry_by_name (GITypelib *typelib, const char *name) { Section *dirindex; size_t i, n_entries; const char *entry_name; DirEntry *entry; dirindex = get_section_by_id (typelib, GI_SECTION_DIRECTORY_INDEX); n_entries = ((Header *)typelib->data)->n_local_entries; if (dirindex == NULL) { for (i = 1; i <= n_entries; i++) { entry = gi_typelib_get_dir_entry (typelib, i); entry_name = gi_typelib_get_string (typelib, entry->name); if (strcmp (name, entry_name) == 0) return entry; } return NULL; } else { uint8_t *hash = (uint8_t *) &typelib->data[dirindex->offset]; uint16_t index; index = gi_typelib_hash_search (hash, name, n_entries); entry = gi_typelib_get_dir_entry (typelib, index + 1); entry_name = gi_typelib_get_string (typelib, entry->name); if (strcmp (name, entry_name) == 0) return entry; return NULL; } } /** * gi_typelib_get_dir_entry_by_gtype_name: * @typelib: a #GITypelib * @gtype_name: name of a [type@GObject.Type] to look up * * Get the typelib directory entry for the [type@GObject.Type] with the given * @gtype_name. * * Returns: (transfer none) (nullable): entry corresponding to @gtype_name, or * `NULL` if none was found * Since: 2.80 */ DirEntry * gi_typelib_get_dir_entry_by_gtype_name (GITypelib *typelib, const char *gtype_name) { Header *header = (Header *)typelib->data; for (size_t i = 1; i <= header->n_local_entries; i++) { RegisteredTypeBlob *blob; const char *type; DirEntry *entry = gi_typelib_get_dir_entry (typelib, i); if (!BLOB_IS_REGISTERED_TYPE (entry)) continue; blob = (RegisteredTypeBlob *)(&typelib->data[entry->offset]); if (!blob->gtype_name) continue; type = gi_typelib_get_string (typelib, blob->gtype_name); if (strcmp (type, gtype_name) == 0) return entry; } return NULL; } typedef struct { const char *s; const char *separator; size_t sep_len; GString buf; } StrSplitIter; static void strsplit_iter_init (StrSplitIter *iter, const char *s, const char *separator) { iter->s = s; iter->separator = separator; iter->sep_len = strlen (separator); iter->buf.str = NULL; iter->buf.len = 0; iter->buf.allocated_len = 0; } static gboolean strsplit_iter_next (StrSplitIter *iter, const char **out_val) { const char *s = iter->s; const char *next; size_t len; if (!s) return FALSE; next = strstr (s, iter->separator); if (next) { iter->s = next + iter->sep_len; len = next - s; } else { iter->s = NULL; len = strlen (s); } if (len == 0) { *out_val = ""; } else { g_string_overwrite_len (&iter->buf, 0, s, (gssize)len); *out_val = iter->buf.str; } return TRUE; } static void strsplit_iter_clear (StrSplitIter *iter) { g_free (iter->buf.str); } /** * gi_typelib_matches_gtype_name_prefix: * @typelib: a #GITypelib * @gtype_name: name of a [type@GObject.Type] * * Check whether the symbol prefix for @typelib is a prefix of the given * @gtype_name. * * Returns: `TRUE` if the prefix for @typelib prefixes @gtype_name * Since: 2.80 */ gboolean gi_typelib_matches_gtype_name_prefix (GITypelib *typelib, const char *gtype_name) { Header *header = (Header *)typelib->data; const char *c_prefix; const char *prefix; gboolean ret = FALSE; StrSplitIter split_iter; size_t gtype_name_len; c_prefix = gi_typelib_get_string (typelib, header->c_prefix); if (c_prefix == NULL || strlen (c_prefix) == 0) return FALSE; gtype_name_len = strlen (gtype_name); /* c_prefix is a comma separated string of supported prefixes * in the typelib. * We match the specified gtype_name if the gtype_name starts * with the prefix, and is followed by a capital letter. * For example, a typelib offering the 'Gdk' prefix does match * GdkX11Cursor, however a typelib offering the 'G' prefix does not. */ strsplit_iter_init (&split_iter, c_prefix, ","); while (strsplit_iter_next (&split_iter, &prefix)) { size_t len = strlen (prefix); if (gtype_name_len < len) continue; if (strncmp (prefix, gtype_name, len) != 0) continue; if (g_ascii_isupper (gtype_name[len])) { ret = TRUE; break; } } strsplit_iter_clear (&split_iter); return ret; } /** * gi_typelib_get_dir_entry_by_error_domain: * @typelib: a #GITypelib * @error_domain: name of a [type@GLib.Error] domain to look up * * Get the typelib directory entry for the [type@GLib.Error] domain with the * given @error_domain name. * * Returns: (transfer none) (nullable): entry corresponding to @error_domain, or * `NULL` if none was found * Since: 2.80 */ DirEntry * gi_typelib_get_dir_entry_by_error_domain (GITypelib *typelib, GQuark error_domain) { Header *header = (Header *)typelib->data; size_t n_entries = header->n_local_entries; const char *domain_string = g_quark_to_string (error_domain); DirEntry *entry; for (size_t i = 1; i <= n_entries; i++) { EnumBlob *blob; const char *enum_domain_string; entry = gi_typelib_get_dir_entry (typelib, i); if (entry->blob_type != BLOB_TYPE_ENUM) continue; blob = (EnumBlob *)(&typelib->data[entry->offset]); if (!blob->error_domain) continue; enum_domain_string = gi_typelib_get_string (typelib, blob->error_domain); if (strcmp (domain_string, enum_domain_string) == 0) return entry; } return NULL; } /* When changing the size of a typelib structure, you are required to update * the hardcoded size here. Do NOT change these to use sizeof(); these * should match whatever is defined in the text specification and serve as * a sanity check on structure modifications. * * Everything else in the code however should be using sizeof(). */ G_STATIC_ASSERT (sizeof (Header) == 112); G_STATIC_ASSERT (sizeof (DirEntry) == 12); G_STATIC_ASSERT (sizeof (SimpleTypeBlob) == 4); G_STATIC_ASSERT (sizeof (ArgBlob) == 16); G_STATIC_ASSERT (sizeof (SignatureBlob) == 8); G_STATIC_ASSERT (sizeof (CommonBlob) == 8); G_STATIC_ASSERT (sizeof (FunctionBlob) == 20); G_STATIC_ASSERT (sizeof (CallbackBlob) == 12); G_STATIC_ASSERT (sizeof (InterfaceTypeBlob) == 4); G_STATIC_ASSERT (sizeof (ArrayTypeBlob) == 8); G_STATIC_ASSERT (sizeof (ParamTypeBlob) == 4); G_STATIC_ASSERT (sizeof (ErrorTypeBlob) == 4); G_STATIC_ASSERT (sizeof (ValueBlob) == 12); G_STATIC_ASSERT (sizeof (FieldBlob) == 16); G_STATIC_ASSERT (sizeof (RegisteredTypeBlob) == 16); G_STATIC_ASSERT (sizeof (StructBlob) == 32); G_STATIC_ASSERT (sizeof (EnumBlob) == 24); G_STATIC_ASSERT (sizeof (PropertyBlob) == 16); G_STATIC_ASSERT (sizeof (SignalBlob) == 16); G_STATIC_ASSERT (sizeof (VFuncBlob) == 20); G_STATIC_ASSERT (sizeof (ObjectBlob) == 60); G_STATIC_ASSERT (sizeof (InterfaceBlob) == 40); G_STATIC_ASSERT (sizeof (ConstantBlob) == 24); G_STATIC_ASSERT (sizeof (AttributeBlob) == 12); G_STATIC_ASSERT (sizeof (UnionBlob) == 40); static gboolean is_aligned (uint32_t offset) { return offset == ALIGN_VALUE (offset, 4); } #define MAX_NAME_LEN 2048 static const char * get_string (GITypelib *typelib, uint32_t offset, GError **error) { if (typelib->len < offset) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "Buffer is too short while looking up name"); return NULL; } return (const char*)&typelib->data[offset]; } static const char * get_string_nofail (GITypelib *typelib, uint32_t offset) { const char *ret = get_string (typelib, offset, NULL); g_assert (ret); return ret; } static gboolean validate_name (GITypelib *typelib, const char *msg, const uint8_t *data, uint32_t offset, GError **error) { const char *name; name = get_string (typelib, offset, error); if (!name) return FALSE; if (!memchr (name, '\0', MAX_NAME_LEN)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The %s is too long: %s", msg, name); return FALSE; } if (strspn (name, G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_") < strlen (name)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The %s contains invalid characters: '%s'", msg, name); return FALSE; } return TRUE; } /* Fast path sanity check, operates on a memory blob */ static gboolean validate_header_basic (const uint8_t *memory, size_t len, GError **error) { Header *header = (Header *)memory; if (len < sizeof (Header)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The specified typelib length %zu is too short", len); return FALSE; } if (strncmp (header->magic, GI_IR_MAGIC, 16) != 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Invalid magic header"); return FALSE; } if (header->major_version != 4) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Typelib version mismatch; expected 4, found %d", header->major_version); return FALSE; } if (header->n_entries < header->n_local_entries) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Inconsistent entry counts"); return FALSE; } if (header->size != len) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Typelib size %zu does not match %zu", (size_t) header->size, len); return FALSE; } /* This is a sanity check for a specific typelib; it * prevents us from loading an incompatible typelib. * * The hardcoded static checks to protect against inadvertent * or buggy changes to the typelib format itself. */ if (header->entry_blob_size != sizeof (DirEntry) || header->function_blob_size != sizeof (FunctionBlob) || header->callback_blob_size != sizeof (CallbackBlob) || header->signal_blob_size != sizeof (SignalBlob) || header->vfunc_blob_size != sizeof (VFuncBlob) || header->arg_blob_size != sizeof (ArgBlob) || header->property_blob_size != sizeof (PropertyBlob) || header->field_blob_size != sizeof (FieldBlob) || header->value_blob_size != sizeof (ValueBlob) || header->constant_blob_size != sizeof (ConstantBlob) || header->attribute_blob_size != sizeof (AttributeBlob) || header->signature_blob_size != sizeof (SignatureBlob) || header->enum_blob_size != sizeof (EnumBlob) || header->struct_blob_size != sizeof (StructBlob) || header->object_blob_size != sizeof(ObjectBlob) || header->interface_blob_size != sizeof (InterfaceBlob) || header->union_blob_size != sizeof (UnionBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Blob size mismatch"); return FALSE; } if (!is_aligned (header->directory)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Misaligned directory"); return FALSE; } if (!is_aligned (header->attributes)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Misaligned attributes"); return FALSE; } if (header->attributes == 0 && header->n_attributes > 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_HEADER, "Wrong number of attributes"); return FALSE; } return TRUE; } static gboolean validate_header (ValidateContext *ctx, GError **error) { GITypelib *typelib = ctx->typelib; if (!validate_header_basic (typelib->data, typelib->len, error)) return FALSE; { Header *header = (Header*)typelib->data; if (!validate_name (typelib, "namespace", typelib->data, header->namespace, error)) return FALSE; } return TRUE; } static gboolean validate_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, GError **error); static gboolean validate_array_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, GError **error) { /* FIXME validate length */ if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (ArrayTypeBlob, type), 0, FALSE, error)) return FALSE; return TRUE; } static gboolean validate_iface_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, GError **error) { InterfaceTypeBlob *blob; InterfaceBlob *target; blob = (InterfaceTypeBlob*)&typelib->data[offset]; target = (InterfaceBlob*) get_dir_entry_checked (typelib, blob->interface, error); if (!target) return FALSE; if (target->blob_type == 0) /* non-local */ return TRUE; return TRUE; } static gboolean validate_param_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, size_t n_params, GError **error) { ParamTypeBlob *blob; blob = (ParamTypeBlob*)&typelib->data[offset]; if (!blob->pointer) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Pointer type exected for tag %d", blob->tag); return FALSE; } if (blob->n_types != n_params) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Parameter type number mismatch"); return FALSE; } for (size_t i = 0; i < n_params; i++) { if (!validate_type_blob (typelib, offset + sizeof (ParamTypeBlob) + i * sizeof (SimpleTypeBlob), 0, FALSE, error)) return FALSE; } return TRUE; } static gboolean validate_error_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, GError **error) { ErrorTypeBlob *blob; blob = (ErrorTypeBlob*)&typelib->data[offset]; if (!blob->pointer) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Pointer type exected for tag %d", blob->tag); return FALSE; } return TRUE; } static gboolean validate_type_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, gboolean return_type, GError **error) { SimpleTypeBlob *simple; InterfaceTypeBlob *iface; simple = (SimpleTypeBlob *)&typelib->data[offset]; if (simple->flags.reserved == 0 && simple->flags.reserved2 == 0) { if (!GI_TYPE_TAG_IS_BASIC(simple->flags.tag)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid non-basic tag %d in simple type", simple->flags.tag); return FALSE; } if (simple->flags.tag >= GI_TYPE_TAG_UTF8 && simple->flags.tag != GI_TYPE_TAG_UNICHAR && !simple->flags.pointer) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Pointer type exected for tag %d", simple->flags.tag); return FALSE; } return TRUE; } iface = (InterfaceTypeBlob*)&typelib->data[simple->offset]; switch (iface->tag) { case GI_TYPE_TAG_ARRAY: if (!validate_array_type_blob (typelib, simple->offset, signature_offset, return_type, error)) return FALSE; break; case GI_TYPE_TAG_INTERFACE: if (!validate_iface_type_blob (typelib, simple->offset, signature_offset, return_type, error)) return FALSE; break; case GI_TYPE_TAG_GLIST: case GI_TYPE_TAG_GSLIST: if (!validate_param_type_blob (typelib, simple->offset, signature_offset, return_type, 1, error)) return FALSE; break; case GI_TYPE_TAG_GHASH: if (!validate_param_type_blob (typelib, simple->offset, signature_offset, return_type, 2, error)) return FALSE; break; case GI_TYPE_TAG_ERROR: if (!validate_error_type_blob (typelib, simple->offset, signature_offset, return_type, error)) return FALSE; break; default: g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong tag in complex type"); return FALSE; } return TRUE; } static gboolean validate_arg_blob (GITypelib *typelib, uint32_t offset, uint32_t signature_offset, GError **error) { ArgBlob *blob; if (typelib->len < offset + sizeof (ArgBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (ArgBlob*) &typelib->data[offset]; if (!validate_name (typelib, "argument", typelib->data, blob->name, error)) return FALSE; if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (ArgBlob, arg_type), signature_offset, FALSE, error)) return FALSE; return TRUE; } static SimpleTypeBlob * return_type_from_signature (GITypelib *typelib, uint32_t offset, GError **error) { SignatureBlob *blob; if (typelib->len < offset + sizeof (SignatureBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return NULL; } blob = (SignatureBlob*) &typelib->data[offset]; if (blob->return_type.offset == 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "No return type found in signature"); return NULL; } return (SimpleTypeBlob *)&typelib->data[offset + G_STRUCT_OFFSET (SignatureBlob, return_type)]; } static gboolean validate_signature_blob (GITypelib *typelib, uint32_t offset, GError **error) { SignatureBlob *blob; if (typelib->len < offset + sizeof (SignatureBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (SignatureBlob*) &typelib->data[offset]; if (blob->return_type.offset != 0) { if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (SignatureBlob, return_type), offset, TRUE, error)) return FALSE; } for (size_t i = 0; i < blob->n_arguments; i++) { if (!validate_arg_blob (typelib, offset + sizeof (SignatureBlob) + i * sizeof (ArgBlob), offset, error)) return FALSE; } /* FIXME check constraints on return_value */ /* FIXME check array-length pairs */ return TRUE; } static gboolean validate_function_blob (ValidateContext *ctx, uint32_t offset, uint16_t container_type, GError **error) { GITypelib *typelib = ctx->typelib; FunctionBlob *blob; if (typelib->len < offset + sizeof (FunctionBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (FunctionBlob*) &typelib->data[offset]; if (blob->blob_type != BLOB_TYPE_FUNCTION) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type %d, expected function", blob->blob_type); return FALSE; } if (!validate_name (typelib, "function", typelib->data, blob->name, error)) return FALSE; push_context (ctx, get_string_nofail (typelib, blob->name)); if (!validate_name (typelib, "function symbol", typelib->data, blob->symbol, error)) return FALSE; if (blob->constructor) { switch (container_type) { case BLOB_TYPE_BOXED: case BLOB_TYPE_STRUCT: case BLOB_TYPE_UNION: case BLOB_TYPE_OBJECT: case BLOB_TYPE_INTERFACE: break; default: g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Constructor not allowed"); return FALSE; } } if (blob->setter || blob->getter || blob->wraps_vfunc) { switch (container_type) { case BLOB_TYPE_OBJECT: case BLOB_TYPE_INTERFACE: break; default: g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Setter, getter or wrapper not allowed"); return FALSE; } } if (blob->index) { if (!(blob->setter || blob->getter || blob->wraps_vfunc)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Must be setter, getter or wrapper"); return FALSE; } } /* FIXME: validate index range */ if (!validate_signature_blob (typelib, blob->signature, error)) return FALSE; if (blob->constructor) { SimpleTypeBlob *simple = return_type_from_signature (typelib, blob->signature, error); InterfaceTypeBlob *iface_type; if (!simple) return FALSE; iface_type = get_type_blob (typelib, simple, error); if (!iface_type) return FALSE; if (iface_type->tag != GI_TYPE_TAG_INTERFACE && (container_type == BLOB_TYPE_OBJECT || container_type == BLOB_TYPE_INTERFACE)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "Invalid return type '%s' for constructor '%s'", gi_type_tag_to_string (iface_type->tag), get_string_nofail (typelib, blob->symbol)); return FALSE; } } pop_context (ctx); return TRUE; } static gboolean validate_callback_blob (ValidateContext *ctx, uint32_t offset, GError **error) { GITypelib *typelib = ctx->typelib; CallbackBlob *blob; if (typelib->len < offset + sizeof (CallbackBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (CallbackBlob*) &typelib->data[offset]; if (blob->blob_type != BLOB_TYPE_CALLBACK) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type"); return FALSE; } if (!validate_name (typelib, "callback", typelib->data, blob->name, error)) return FALSE; push_context (ctx, get_string_nofail (typelib, blob->name)); if (!validate_signature_blob (typelib, blob->signature, error)) return FALSE; pop_context (ctx); return TRUE; } static gboolean validate_constant_blob (GITypelib *typelib, uint32_t offset, GError **error) { size_t value_size[] = { 0, /* VOID */ 4, /* BOOLEAN */ 1, /* INT8 */ 1, /* UINT8 */ 2, /* INT16 */ 2, /* UINT16 */ 4, /* INT32 */ 4, /* UINT32 */ 8, /* INT64 */ 8, /* UINT64 */ sizeof (float), sizeof (double), 0, /* GTYPE */ 0, /* UTF8 */ 0, /* FILENAME */ 0, /* ARRAY */ 0, /* INTERFACE */ 0, /* GLIST */ 0, /* GSLIST */ 0, /* GHASH */ 0, /* ERROR */ 4 /* UNICHAR */ }; ConstantBlob *blob; SimpleTypeBlob *type; g_assert (G_N_ELEMENTS (value_size) == GI_TYPE_TAG_N_TYPES); if (typelib->len < offset + sizeof (ConstantBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (ConstantBlob*) &typelib->data[offset]; if (blob->blob_type != BLOB_TYPE_CONSTANT) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type"); return FALSE; } if (!validate_name (typelib, "constant", typelib->data, blob->name, error)) return FALSE; if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (ConstantBlob, type), 0, FALSE, error)) return FALSE; if (!is_aligned (blob->offset)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Misaligned constant value"); return FALSE; } type = (SimpleTypeBlob *)&typelib->data[offset + G_STRUCT_OFFSET (ConstantBlob, type)]; if (type->flags.reserved == 0 && type->flags.reserved2 == 0) { if (type->flags.tag == 0) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Constant value type void"); return FALSE; } if (value_size[type->flags.tag] != 0 && blob->size != value_size[type->flags.tag]) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Constant value size mismatch"); return FALSE; } /* FIXME check string values */ } return TRUE; } static gboolean validate_value_blob (GITypelib *typelib, uint32_t offset, GError **error) { ValueBlob *blob; if (typelib->len < offset + sizeof (ValueBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (ValueBlob*) &typelib->data[offset]; if (!validate_name (typelib, "value", typelib->data, blob->name, error)) return FALSE; return TRUE; } static gboolean validate_field_blob (ValidateContext *ctx, uint32_t offset, GError **error) { GITypelib *typelib = ctx->typelib; Header *header = (Header *)typelib->data; FieldBlob *blob; if (typelib->len < offset + sizeof (FieldBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (FieldBlob*) &typelib->data[offset]; if (!validate_name (typelib, "field", typelib->data, blob->name, error)) return FALSE; if (blob->has_embedded_type) { if (!validate_callback_blob (ctx, offset + header->field_blob_size, error)) return FALSE; } else if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (FieldBlob, type), 0, FALSE, error)) return FALSE; return TRUE; } static gboolean validate_property_blob (GITypelib *typelib, uint32_t offset, GError **error) { PropertyBlob *blob; if (typelib->len < offset + sizeof (PropertyBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (PropertyBlob*) &typelib->data[offset]; if (!validate_name (typelib, "property", typelib->data, blob->name, error)) return FALSE; if (!validate_type_blob (typelib, offset + G_STRUCT_OFFSET (PropertyBlob, type), 0, FALSE, error)) return FALSE; return TRUE; } static gboolean validate_signal_blob (GITypelib *typelib, uint32_t offset, uint32_t container_offset, GError **error) { SignalBlob *blob; size_t n_signals; if (typelib->len < offset + sizeof (SignalBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (SignalBlob*) &typelib->data[offset]; if (!validate_name (typelib, "signal", typelib->data, blob->name, error)) return FALSE; if ((blob->run_first != 0) + (blob->run_last != 0) + (blob->run_cleanup != 0) != 1) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid signal run flags"); return FALSE; } if (blob->has_class_closure) { if (((CommonBlob*)&typelib->data[container_offset])->blob_type == BLOB_TYPE_OBJECT) { ObjectBlob *object; object = (ObjectBlob*)&typelib->data[container_offset]; n_signals = object->n_signals; } else { InterfaceBlob *iface; iface = (InterfaceBlob*)&typelib->data[container_offset]; n_signals = iface->n_signals; } if (blob->class_closure >= n_signals) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid class closure index"); return FALSE; } } if (!validate_signature_blob (typelib, blob->signature, error)) return FALSE; return TRUE; } static gboolean validate_vfunc_blob (GITypelib *typelib, uint32_t offset, uint32_t container_offset, GError **error) { VFuncBlob *blob; size_t n_vfuncs; if (typelib->len < offset + sizeof (VFuncBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (VFuncBlob*) &typelib->data[offset]; if (!validate_name (typelib, "vfunc", typelib->data, blob->name, error)) return FALSE; if (blob->class_closure) { if (((CommonBlob*)&typelib->data[container_offset])->blob_type == BLOB_TYPE_OBJECT) { ObjectBlob *object; object = (ObjectBlob*)&typelib->data[container_offset]; n_vfuncs = object->n_vfuncs; } else { InterfaceBlob *iface; iface = (InterfaceBlob*)&typelib->data[container_offset]; n_vfuncs = iface->n_vfuncs; } if (blob->class_closure >= n_vfuncs) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid class closure index"); return FALSE; } } if (!validate_signature_blob (typelib, blob->signature, error)) return FALSE; return TRUE; } static gboolean validate_struct_blob (ValidateContext *ctx, uint32_t offset, uint16_t blob_type, GError **error) { GITypelib *typelib = ctx->typelib; StructBlob *blob; size_t i; uint32_t field_offset; if (typelib->len < offset + sizeof (StructBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (StructBlob*) &typelib->data[offset]; if (blob->blob_type != blob_type) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type"); return FALSE; } if (!validate_name (typelib, "struct", typelib->data, blob->name, error)) return FALSE; push_context (ctx, get_string_nofail (typelib, blob->name)); if (!blob->unregistered) { if (!validate_name (typelib, "boxed", typelib->data, blob->gtype_name, error)) return FALSE; if (!validate_name (typelib, "boxed", typelib->data, blob->gtype_init, error)) return FALSE; } else { if (blob->gtype_name || blob->gtype_init) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Gtype data in struct"); return FALSE; } } if (typelib->len < offset + sizeof (StructBlob) + blob->n_fields * sizeof (FieldBlob) + blob->n_methods * sizeof (FunctionBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } field_offset = offset + sizeof (StructBlob); for (i = 0; i < blob->n_fields; i++) { FieldBlob *field_blob = (FieldBlob*) &typelib->data[field_offset]; if (!validate_field_blob (ctx, field_offset, error)) return FALSE; field_offset += sizeof (FieldBlob); if (field_blob->has_embedded_type) field_offset += sizeof (CallbackBlob); } for (i = 0; i < blob->n_methods; i++) { if (!validate_function_blob (ctx, field_offset + i * sizeof (FunctionBlob), blob_type, error)) return FALSE; } pop_context (ctx); return TRUE; } static gboolean validate_enum_blob (ValidateContext *ctx, uint32_t offset, uint16_t blob_type, GError **error) { GITypelib *typelib = ctx->typelib; EnumBlob *blob; uint32_t offset2; if (typelib->len < offset + sizeof (EnumBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (EnumBlob*) &typelib->data[offset]; if (blob->blob_type != blob_type) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type"); return FALSE; } if (!blob->unregistered) { if (!validate_name (typelib, "enum", typelib->data, blob->gtype_name, error)) return FALSE; if (!validate_name (typelib, "enum", typelib->data, blob->gtype_init, error)) return FALSE; } else { if (blob->gtype_name || blob->gtype_init) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Gtype data in unregistered enum"); return FALSE; } } if (!validate_name (typelib, "enum", typelib->data, blob->name, error)) return FALSE; if (typelib->len < offset + sizeof (EnumBlob) + blob->n_values * sizeof (ValueBlob) + blob->n_methods * sizeof (FunctionBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } offset2 = offset + sizeof (EnumBlob); push_context (ctx, get_string_nofail (typelib, blob->name)); for (size_t i = 0; i < blob->n_values; i++, offset2 += sizeof (ValueBlob)) { if (!validate_value_blob (typelib, offset2, error)) return FALSE; #if 0 v1 = (ValueBlob *)&typelib->data[offset2]; for (j = 0; j < i; j++) { v2 = (ValueBlob *)&typelib->data[offset2 + j * sizeof (ValueBlob)]; if (v1->value == v2->value) { /* FIXME should this be an error ? */ g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Duplicate enum value"); return FALSE; } } #endif } for (size_t i = 0; i < blob->n_methods; i++, offset2 += sizeof (FunctionBlob)) { if (!validate_function_blob (ctx, offset2, BLOB_TYPE_ENUM, error)) return FALSE; } pop_context (ctx); return TRUE; } static gboolean validate_object_blob (ValidateContext *ctx, uint32_t offset, GError **error) { GITypelib *typelib = ctx->typelib; Header *header; ObjectBlob *blob; size_t i; uint32_t offset2; uint16_t n_field_callbacks; header = (Header *)typelib->data; if (typelib->len < offset + sizeof (ObjectBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (ObjectBlob*) &typelib->data[offset]; if (blob->blob_type != BLOB_TYPE_OBJECT) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type"); return FALSE; } if (!validate_name (typelib, "object", typelib->data, blob->gtype_name, error)) return FALSE; if (!validate_name (typelib, "object", typelib->data, blob->gtype_init, error)) return FALSE; if (!validate_name (typelib, "object", typelib->data, blob->name, error)) return FALSE; if (blob->parent > header->n_entries) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid parent index"); return FALSE; } if (blob->parent != 0) { DirEntry *entry; entry = get_dir_entry_checked (typelib, blob->parent, error); if (!entry) return FALSE; if (entry->blob_type != BLOB_TYPE_OBJECT && (entry->local || entry->blob_type != 0)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Parent not object"); return FALSE; } } if (blob->gtype_struct != 0) { DirEntry *entry; entry = get_dir_entry_checked (typelib, blob->gtype_struct, error); if (!entry) return FALSE; if (entry->blob_type != BLOB_TYPE_STRUCT && entry->local) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Class struct invalid type or not local"); return FALSE; } } if (typelib->len < offset + sizeof (ObjectBlob) + (blob->n_interfaces + blob->n_interfaces % 2) * 2 + blob->n_fields * sizeof (FieldBlob) + blob->n_properties * sizeof (PropertyBlob) + blob->n_methods * sizeof (FunctionBlob) + blob->n_signals * sizeof (SignalBlob) + blob->n_vfuncs * sizeof (VFuncBlob) + blob->n_constants * sizeof (ConstantBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } offset2 = offset + sizeof (ObjectBlob); for (i = 0; i < blob->n_interfaces; i++, offset2 += 2) { uint16_t iface; DirEntry *entry; iface = *(uint16_t *)&typelib->data[offset2]; if (iface == 0 || iface > header->n_entries) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid interface index"); return FALSE; } entry = get_dir_entry_checked (typelib, iface, error); if (!entry) return FALSE; if (entry->blob_type != BLOB_TYPE_INTERFACE && (entry->local || entry->blob_type != 0)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Not an interface"); return FALSE; } } offset2 += 2 * (blob->n_interfaces %2); push_context (ctx, get_string_nofail (typelib, blob->name)); n_field_callbacks = 0; for (i = 0; i < blob->n_fields; i++) { FieldBlob *field_blob = (FieldBlob*) &typelib->data[offset2]; if (!validate_field_blob (ctx, offset2, error)) return FALSE; offset2 += sizeof (FieldBlob); /* Special case fields which are callbacks. */ if (field_blob->has_embedded_type) { offset2 += sizeof (CallbackBlob); n_field_callbacks++; } } if (blob->n_field_callbacks != n_field_callbacks) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Incorrect number of field callbacks; expected " "%" G_GUINT16_FORMAT ", got %" G_GUINT16_FORMAT, blob->n_field_callbacks, n_field_callbacks); return FALSE; } for (i = 0; i < blob->n_properties; i++, offset2 += sizeof (PropertyBlob)) { if (!validate_property_blob (typelib, offset2, error)) return FALSE; } for (i = 0; i < blob->n_methods; i++, offset2 += sizeof (FunctionBlob)) { if (!validate_function_blob (ctx, offset2, BLOB_TYPE_OBJECT, error)) return FALSE; } for (i = 0; i < blob->n_signals; i++, offset2 += sizeof (SignalBlob)) { if (!validate_signal_blob (typelib, offset2, offset, error)) return FALSE; } for (i = 0; i < blob->n_vfuncs; i++, offset2 += sizeof (VFuncBlob)) { if (!validate_vfunc_blob (typelib, offset2, offset, error)) return FALSE; } for (i = 0; i < blob->n_constants; i++, offset2 += sizeof (ConstantBlob)) { if (!validate_constant_blob (typelib, offset2, error)) return FALSE; } pop_context (ctx); return TRUE; } static gboolean validate_interface_blob (ValidateContext *ctx, uint32_t offset, GError **error) { GITypelib *typelib = ctx->typelib; Header *header; InterfaceBlob *blob; size_t i; uint32_t offset2; header = (Header *)typelib->data; if (typelib->len < offset + sizeof (InterfaceBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } blob = (InterfaceBlob*) &typelib->data[offset]; if (blob->blob_type != BLOB_TYPE_INTERFACE) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Wrong blob type; expected interface, got %d", blob->blob_type); return FALSE; } if (!validate_name (typelib, "interface", typelib->data, blob->gtype_name, error)) return FALSE; if (!validate_name (typelib, "interface", typelib->data, blob->gtype_init, error)) return FALSE; if (!validate_name (typelib, "interface", typelib->data, blob->name, error)) return FALSE; if (typelib->len < offset + sizeof (InterfaceBlob) + (blob->n_prerequisites + blob->n_prerequisites % 2) * 2 + blob->n_properties * sizeof (PropertyBlob) + blob->n_methods * sizeof (FunctionBlob) + blob->n_signals * sizeof (SignalBlob) + blob->n_vfuncs * sizeof (VFuncBlob) + blob->n_constants * sizeof (ConstantBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } offset2 = offset + sizeof (InterfaceBlob); for (i = 0; i < blob->n_prerequisites; i++, offset2 += 2) { DirEntry *entry; uint16_t req; req = *(uint16_t *)&typelib->data[offset2]; if (req == 0 || req > header->n_entries) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Invalid prerequisite index"); return FALSE; } entry = gi_typelib_get_dir_entry (typelib, req); if (entry->blob_type != BLOB_TYPE_INTERFACE && entry->blob_type != BLOB_TYPE_OBJECT && (entry->local || entry->blob_type != 0)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_BLOB, "Not an interface or object"); return FALSE; } } offset2 += 2 * (blob->n_prerequisites % 2); push_context (ctx, get_string_nofail (typelib, blob->name)); for (i = 0; i < blob->n_properties; i++, offset2 += sizeof (PropertyBlob)) { if (!validate_property_blob (typelib, offset2, error)) return FALSE; } for (i = 0; i < blob->n_methods; i++, offset2 += sizeof (FunctionBlob)) { if (!validate_function_blob (ctx, offset2, BLOB_TYPE_INTERFACE, error)) return FALSE; } for (i = 0; i < blob->n_signals; i++, offset2 += sizeof (SignalBlob)) { if (!validate_signal_blob (typelib, offset2, offset, error)) return FALSE; } for (i = 0; i < blob->n_vfuncs; i++, offset2 += sizeof (VFuncBlob)) { if (!validate_vfunc_blob (typelib, offset2, offset, error)) return FALSE; } for (i = 0; i < blob->n_constants; i++, offset2 += sizeof (ConstantBlob)) { if (!validate_constant_blob (typelib, offset2, error)) return FALSE; } pop_context (ctx); return TRUE; } static gboolean validate_union_blob (GITypelib *typelib, uint32_t offset, GError **error) { return TRUE; } static gboolean validate_blob (ValidateContext *ctx, uint32_t offset, GError **error) { GITypelib *typelib = ctx->typelib; CommonBlob *common; if (typelib->len < offset + sizeof (CommonBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } common = (CommonBlob*)&typelib->data[offset]; switch (common->blob_type) { case BLOB_TYPE_FUNCTION: if (!validate_function_blob (ctx, offset, 0, error)) return FALSE; break; case BLOB_TYPE_CALLBACK: if (!validate_callback_blob (ctx, offset, error)) return FALSE; break; case BLOB_TYPE_STRUCT: case BLOB_TYPE_BOXED: if (!validate_struct_blob (ctx, offset, common->blob_type, error)) return FALSE; break; case BLOB_TYPE_ENUM: case BLOB_TYPE_FLAGS: if (!validate_enum_blob (ctx, offset, common->blob_type, error)) return FALSE; break; case BLOB_TYPE_OBJECT: if (!validate_object_blob (ctx, offset, error)) return FALSE; break; case BLOB_TYPE_INTERFACE: if (!validate_interface_blob (ctx, offset, error)) return FALSE; break; case BLOB_TYPE_CONSTANT: if (!validate_constant_blob (typelib, offset, error)) return FALSE; break; case BLOB_TYPE_UNION: if (!validate_union_blob (typelib, offset, error)) return FALSE; break; default: g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_ENTRY, "Invalid blob type"); return FALSE; } return TRUE; } static gboolean validate_directory (ValidateContext *ctx, GError **error) { GITypelib *typelib = ctx->typelib; Header *header = (Header *)typelib->data; DirEntry *entry; size_t i; if (typelib->len < header->directory + header->n_entries * sizeof (DirEntry)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } for (i = 0; i < header->n_entries; i++) { entry = gi_typelib_get_dir_entry (typelib, i + 1); if (!validate_name (typelib, "entry", typelib->data, entry->name, error)) return FALSE; if ((entry->local && entry->blob_type == BLOB_TYPE_INVALID) || entry->blob_type > BLOB_TYPE_UNION) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_DIRECTORY, "Invalid entry type"); return FALSE; } if (i < header->n_local_entries) { if (!entry->local) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_DIRECTORY, "Too few local directory entries"); return FALSE; } if (!is_aligned (entry->offset)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_DIRECTORY, "Misaligned entry"); return FALSE; } if (!validate_blob (ctx, entry->offset, error)) return FALSE; } else { if (entry->local) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID_DIRECTORY, "Too many local directory entries"); return FALSE; } if (!validate_name (typelib, "namespace", typelib->data, entry->offset, error)) return FALSE; } } return TRUE; } static gboolean validate_attributes (ValidateContext *ctx, GError **error) { GITypelib *typelib = ctx->typelib; Header *header = (Header *)typelib->data; if (header->size < header->attributes + header->n_attributes * sizeof (AttributeBlob)) { g_set_error (error, GI_TYPELIB_ERROR, GI_TYPELIB_ERROR_INVALID, "The buffer is too short"); return FALSE; } return TRUE; } static void prefix_with_context (GError **error, const char *section, ValidateContext *ctx) { GString *str; GSList *link; char *buf; link = ctx->context_stack; if (!link) { g_prefix_error (error, "In %s:", section); return; } str = g_string_new (NULL); for (; link; link = link->next) { g_string_append (str, link->data); if (link->next) g_string_append_c (str, '/'); } g_string_append_c (str, ')'); buf = g_string_free (str, FALSE); g_prefix_error (error, "In %s (Context: %s): ", section, buf); g_free (buf); } /** * gi_typelib_validate: * @typelib: a #GITypelib * @error: return location for a [type@GLib.Error], or `NULL` * * Check whether @typelib is well-formed, i.e. that the file is not corrupt or * truncated. * * Returns: `TRUE` if @typelib is well-formed, `FALSE` otherwise * Since: 2.80 */ gboolean gi_typelib_validate (GITypelib *typelib, GError **error) { ValidateContext ctx; ctx.typelib = typelib; ctx.context_stack = NULL; if (!validate_header (&ctx, error)) { prefix_with_context (error, "In header", &ctx); return FALSE; } if (!validate_directory (&ctx, error)) { prefix_with_context (error, "directory", &ctx); return FALSE; } if (!validate_attributes (&ctx, error)) { prefix_with_context (error, "attributes", &ctx); return FALSE; } return TRUE; } /** * gi_typelib_error_quark: * * Get the quark representing the [type@GIRepository.TypelibError] error domain. * * Returns: quark representing the error domain * Since: 2.80 */ GQuark gi_typelib_error_quark (void) { static GQuark quark = 0; if (quark == 0) quark = g_quark_from_static_string ("gi-typelib-error-quark"); return quark; } /* Note on the GModule flags used by this function: * Glade's autoconnect feature and OpenGL's extension mechanism * as used by Clutter rely on g_module_open(NULL) to work as a means of * accessing the app's symbols. This keeps us from using * G_MODULE_BIND_LOCAL. BIND_LOCAL may have other issues as well; * in general libraries are not expecting multiple copies of * themselves and are not expecting to be unloaded. So we just * load modules globally for now. */ static GModule * load_one_shared_library (GITypelib *typelib, const char *shlib) { GModule *m; #ifdef __APPLE__ /* On macOS, @-prefixed shlib paths (@rpath, @executable_path, @loader_path) need to be treated as absolute; trying to combine them with a configured library path produces a mangled path that is unresolvable and may cause unintended side effects (such as loading the library from a fall-back location on macOS 12.0.1). */ if (!g_path_is_absolute (shlib) && !g_str_has_prefix (shlib, "@")) #else if (!g_path_is_absolute (shlib)) #endif { /* First try in configured library paths */ for (unsigned int i = 0; typelib->library_paths != NULL && i < typelib->library_paths->len; i++) { char *path = g_build_filename (typelib->library_paths->pdata[i], shlib, NULL); m = g_module_open (path, G_MODULE_BIND_LAZY); g_free (path); if (m != NULL) return m; } } /* Then try loading from standard paths */ /* Do not attempt to fix up shlib to replace .la with .so: it's done by GModule anyway. */ return g_module_open (shlib, G_MODULE_BIND_LAZY); } static void gi_typelib_do_dlopen (GITypelib *typelib) { Header *header; const char *shlib_str; header = (Header *) typelib->data; /* note that NULL shlib means to open the main app, which is allowed */ if (header->shared_library) shlib_str = gi_typelib_get_string (typelib, header->shared_library); else shlib_str = NULL; if (shlib_str != NULL && shlib_str[0] != '\0') { char **shlibs; /* shared-library is a comma-separated list of libraries */ shlibs = g_strsplit (shlib_str, ",", 0); /* We load all passed libs unconditionally as if the same library is loaded * again with g_module_open(), the same file handle will be returned. See bug: * http://bugzilla.gnome.org/show_bug.cgi?id=555294 */ for (size_t i = 0; shlibs[i]; i++) { GModule *module; module = load_one_shared_library (typelib, shlibs[i]); if (module == NULL) { g_warning ("Failed to load shared library '%s' referenced by the typelib: %s", shlibs[i], g_module_error ()); } else { typelib->modules = g_list_append (typelib->modules, module); } } g_strfreev (shlibs); } else { /* If there's no shared-library entry for this module, assume that * the module is for the application. Some of the hand-written .gir files * in gobject-introspection don't have shared-library entries, but no one * is really going to be calling g_module_symbol on them either. */ GModule *module = g_module_open (NULL, 0); if (module == NULL) g_warning ("gtypelib.c: Failed to g_module_open (NULL): %s", g_module_error ()); else typelib->modules = g_list_prepend (typelib->modules, module); } } static inline void gi_typelib_ensure_open (GITypelib *typelib) { if (typelib->open_attempted) return; typelib->open_attempted = TRUE; gi_typelib_do_dlopen (typelib); } /** * gi_typelib_new_from_bytes: * @bytes: memory chunk containing the typelib * @error: a [type@GLib.Error] * * Creates a new [type@GIRepository.Typelib] from a [type@GLib.Bytes]. * * The [type@GLib.Bytes] can point to a memory location or a mapped file, and * the typelib will hold a reference to it until the repository is destroyed. * * Returns: (transfer full): the new [type@GIRepository.Typelib] * Since: 2.80 */ GITypelib * gi_typelib_new_from_bytes (GBytes *bytes, GError **error) { GITypelib *meta; size_t len; const uint8_t *data = g_bytes_get_data (bytes, &len); if (!validate_header_basic (data, len, error)) return NULL; meta = g_slice_new0 (GITypelib); g_atomic_ref_count_init (&meta->ref_count); meta->bytes = g_bytes_ref (bytes); meta->data = data; meta->len = len; meta->modules = NULL; return meta; } /** * gi_typelib_ref: * @typelib: (transfer none): a #GITypelib * * Increment the reference count of a [type@GIRepository.Typelib]. * * Returns: (transfer full): the same @typelib pointer * Since: 2.80 */ GITypelib * gi_typelib_ref (GITypelib *typelib) { g_return_val_if_fail (typelib != NULL, NULL); g_atomic_ref_count_inc (&typelib->ref_count); return typelib; } /** * gi_typelib_unref: * @typelib: (transfer full): a #GITypelib * * Decrement the reference count of a [type@GIRepository.Typelib]. * * Once the reference count reaches zero, the typelib is freed. * * Since: 2.80 */ void gi_typelib_unref (GITypelib *typelib) { g_return_if_fail (typelib != NULL); if (g_atomic_ref_count_dec (&typelib->ref_count)) { g_clear_pointer (&typelib->bytes, g_bytes_unref); g_clear_pointer (&typelib->library_paths, g_ptr_array_unref); if (typelib->modules) { g_list_foreach (typelib->modules, (GFunc) (void *) g_module_close, NULL); g_list_free (typelib->modules); } g_slice_free (GITypelib, typelib); } } /** * gi_typelib_get_namespace: * @typelib: a #GITypelib * * Get the name of the namespace represented by @typelib. * * Returns: name of the namespace represented by @typelib * Since: 2.80 */ const char * gi_typelib_get_namespace (GITypelib *typelib) { return gi_typelib_get_string (typelib, ((Header *) typelib->data)->namespace); } /** * gi_typelib_symbol: * @typelib: the typelib * @symbol_name: name of symbol to be loaded * @symbol: (out) (nullable): returns a pointer to the symbol value, or `NULL` * on failure * * Loads a symbol from a `GITypelib`. * * Returns: `TRUE` on success * Since: 2.80 */ gboolean gi_typelib_symbol (GITypelib *typelib, const char *symbol_name, void **symbol) { GList *l; gi_typelib_ensure_open (typelib); /* * The reason for having multiple modules dates from gir-repository * when it was desired to inject code (accessors, etc.) into an * existing library. In that situation, the first module listed * will be the custom one, which overrides the main one. A bit * inefficient, but the problem will go away when gir-repository * does. * * For modules with no shared library, we dlopen'd the current * process above. */ for (l = typelib->modules; l; l = l->next) { GModule *module = l->data; if (g_module_symbol (module, symbol_name, symbol)) return TRUE; } return FALSE; }