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glib/girepository/gitypelib.c
Philip Withnall 80f9153a7f girepository: Move search and library paths into GIRepository 
Rather than them being set and stored globally, make them members of
`GIRepository`. This helps us move away from the concept of a global
singleton `GIRepository`.

This is slightly complicated by the fact that the library paths are
needed within the module loading code in `GITypelib`, but at that point
the `GITypelib` doesn’t have access to its parent `GIRepository` to call
`gi_repository_get_library_path()`, so we have to cache them in
`typelib->library_paths`.

It also means that it’s no longer possible to retrieve the ‘unset’ paths
from the globals, so the test for that is removed from
`repository-search-paths.c`.

This commit makes some API breaks, but that’s OK because libgirepository
has not been in a stable release yet.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Helps: #3155
2024-01-26 12:08:17 +00:00

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/* -*- 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 <stdlib.h>
#include <string.h>
#include <glib.h>
#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
*/
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);
meta->bytes = g_bytes_ref (bytes);
meta->data = data;
meta->len = len;
meta->modules = NULL;
return meta;
}
/**
* gi_typelib_free:
* @typelib: (transfer full): a #GITypelib
*
* Free a [type@GIRepository.Typelib].
*
* Since: 2.80
*/
void
gi_typelib_free (GITypelib *typelib)
{
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;
}
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