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Use strlcpy() in xrdp_init_xkb_layout()

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Replace uses of g_strncpy() in xrdp_init_xkb_layout() with the more
correct strlcpy().

In addition, some values and pointers which do not need to be
writeable have been made const.
This commit is contained in:
matt335672
2025-03-31 16:16:03 +01:00
parent d73ce4644b
commit f1f2ce50f1
1 changed files with 93 additions and 70 deletions
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xrdp/lang.c
+93 -70
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@@ -496,21 +496,49 @@ km_load_file(const char *filename, struct xrdp_keymap *keymap)
return rv;
}
/*****************************************************************************/
/***
* looks up a keylayout in a list of values
*
* @param keylayout (e.g. 000000409)
* @param items List of items (one of which is returned)
* @param values List of hexadecimal lookup values
* @param rdp_layout Buffer for result
* @param rdp_layout_len Size of rdp_layout
* @return != 0 for a successful lookup
*/
static int
lookup_keylayout(int keylayout,
const struct list *items,
const struct list *values,
char rdp_layout[], unsigned int rdp_layout_len)
{
int index;
for (index = 0; index < items->count; index++)
{
const char *item = (const char *)list_get_item(items, index);
const char *value = (const char *)list_get_item(values, index);
if (g_atoix(value) == keylayout)
{
strlcpy(rdp_layout, item, rdp_layout_len);
return 1;
}
}
return 0;
}
/*****************************************************************************/
void
xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
{
int fd;
int index = 0;
int bytes;
struct list *names = (struct list *)NULL;
struct list *items = (struct list *)NULL;
struct list *values = (struct list *)NULL;
char *item = (char *)NULL;
char *value = (char *)NULL;
char *q = (char *)NULL;
char keyboard_cfg_file[256] = { 0 };
char rdp_layout[256] = { 0 };
struct list *names = NULL;
struct list *items = NULL;
struct list *values = NULL;
const char *item = NULL;
const char *value = NULL;
const char *q = NULL;
const char *keyboard_cfg_file = XRDP_CFG_PATH "/xrdp_keyboard.ini";
const struct xrdp_keyboard_overrides *ko =
&client_info->xrdp_keyboard_overrides;
@@ -542,14 +570,13 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
}
/* infer model/variant */
/* TODO specify different X11 keyboard models/variants */
g_memset(client_info->model, 0, sizeof(client_info->model));
g_memset(client_info->variant, 0, sizeof(client_info->variant));
g_strncpy(client_info->layout, "us", sizeof(client_info->layout) - 1);
client_info->model[0] = '\0';
client_info->variant[0] = '\0';
strlcpy(client_info->layout, "us", sizeof(client_info->layout));
if (client_info->keyboard_subtype == 3)
{
/* macintosh keyboard */
bytes = sizeof(client_info->variant);
g_strncpy(client_info->variant, "mac", bytes - 1);
strlcpy(client_info->variant, "mac", sizeof(client_info->variant));
}
else if (client_info->keyboard_subtype == 0)
{
@@ -557,7 +584,6 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
client_info->keyboard_subtype = 1;
}
g_snprintf(keyboard_cfg_file, 255, "%s/xrdp_keyboard.ini", XRDP_CFG_PATH);
LOG(LOG_LEVEL_DEBUG, "keyboard_cfg_file %s", keyboard_cfg_file);
fd = g_file_open_ro(keyboard_cfg_file);
@@ -565,8 +591,13 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
if (fd >= 0)
{
int section_found = -1;
char section_rdp_layouts[256] = { 0 };
char section_layouts_map[256] = { 0 };
char section_rdp_layouts[256];
char section_layouts_map[256];
char rdp_layout[256];
section_rdp_layouts[0] = '\0';
section_layouts_map[0] = '\0';
rdp_layout[0] = '\0';
names = list_create();
names->auto_free = 1;
@@ -578,8 +609,8 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
file_read_sections(fd, names);
for (index = 0; index < names->count; index++)
{
q = (char *)list_get_item(names, index);
if (g_strncasecmp("default", q, 8) != 0)
q = (const char *)list_get_item(names, index);
if (g_strcasecmp("default", q) != 0)
{
int i;
@@ -587,8 +618,8 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
for (i = 0; i < items->count; i++)
{
item = (char *)list_get_item(items, i);
value = (char *)list_get_item(values, i);
item = (const char *)list_get_item(items, i);
value = (const char *)list_get_item(values, i);
LOG(LOG_LEVEL_DEBUG, "xrdp_init_xkb_layout: item %s value %s",
item, value);
if (g_strcasecmp(item, "keyboard_type") == 0)
@@ -613,41 +644,40 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
{
if (section_found != -1 && section_found == index)
{
g_strncpy(section_rdp_layouts, value, 255);
strlcpy(section_rdp_layouts, value,
sizeof(section_rdp_layouts));
}
}
else if (g_strcasecmp(item, "layouts_map") == 0)
{
if (section_found != -1 && section_found == index)
{
g_strncpy(section_layouts_map, value, 255);
strlcpy(section_layouts_map, value,
sizeof(section_layouts_map));
}
}
else if (g_strcasecmp(item, "model") == 0)
{
if (section_found != -1 && section_found == index)
{
bytes = sizeof(client_info->model);
g_memset(client_info->model, 0, bytes);
g_strncpy(client_info->model, value, bytes - 1);
strlcpy(client_info->model, value,
sizeof(client_info->model));
}
}
else if (g_strcasecmp(item, "variant") == 0)
{
if (section_found != -1 && section_found == index)
{
bytes = sizeof(client_info->variant);
g_memset(client_info->variant, 0, bytes);
g_strncpy(client_info->variant, value, bytes - 1);
strlcpy(client_info->variant, value,
sizeof(client_info->variant));
}
}
else if (g_strcasecmp(item, "options") == 0)
{
if (section_found != -1 && section_found == index)
{
bytes = sizeof(client_info->options);
g_memset(client_info->options, 0, bytes);
g_strncpy(client_info->options, value, bytes - 1);
strlcpy(client_info->options, value,
sizeof(client_info->options));
}
}
else
@@ -676,15 +706,17 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
file_read_section(fd, "default", items, values);
for (index = 0; index < items->count; index++)
{
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
item = (const char *)list_get_item(items, index);
value = (const char *)list_get_item(values, index);
if (g_strcasecmp(item, "rdp_layouts") == 0)
{
g_strncpy(section_rdp_layouts, value, 255);
strlcpy(section_rdp_layouts, value,
sizeof(section_rdp_layouts));
}
else if (g_strcasecmp(item, "layouts_map") == 0)
{
g_strncpy(section_layouts_map, value, 255);
strlcpy(section_layouts_map, value,
sizeof(section_layouts_map));
}
}
list_clear(items);
@@ -693,53 +725,44 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
/* load the map */
file_read_section(fd, section_rdp_layouts, items, values);
for (index = 0; index < items->count; index++)
if (!lookup_keylayout(client_info->keylayout, items, values,
rdp_layout, sizeof(rdp_layout)))
{
int rdp_layout_id;
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
rdp_layout_id = g_atoix(value);
if (rdp_layout_id == client_info->keylayout)
if ((client_info->keylayout & ~0xffff) != 0)
{
g_strncpy(rdp_layout, item, 255);
break;
}
}
if (rdp_layout[0] == '\0' && (client_info->keylayout & ~0xffff) != 0)
{
// We failed to match the layout, but we may be able
// to match on the lower 16-bits
int alt_layout = client_info->keylayout & 0xffff;
for (index = 0; index < items->count; index++)
{
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
int rdp_layout_id = g_atoix(value);
if (rdp_layout_id == alt_layout)
// We failed to match the layout, but we may be able
// to match on the lower 16-bits
int alt_layout = client_info->keylayout & 0xffff;
if (lookup_keylayout(alt_layout, items, values,
rdp_layout, sizeof(rdp_layout)))
{
g_strncpy(rdp_layout, item, 255);
LOG(LOG_LEVEL_INFO,
"Failed to match layout 0x%08X, but matched 0x%04X to %s",
client_info->keylayout, alt_layout, rdp_layout);
break;
}
}
}
list_clear(items);
list_clear(values);
file_read_section(fd, section_layouts_map, items, values);
for (index = 0; index < items->count; index++)
// If we found a layout in the rdp layouts section, copy the
// corresponding X11 layout name to the client layout, e.g. if we
// matched 0xe0200411 to 'rdp_layout_jp, copy 'jp' for the client.
if (rdp_layout[0] != '\0')
{
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
if (g_strcasecmp(item, rdp_layout) == 0)
file_read_section(fd, section_layouts_map, items, values);
for (index = 0; index < items->count; index++)
{
bytes = sizeof(client_info->layout);
g_strncpy(client_info->layout, value, bytes - 1);
break;
item = (const char *)list_get_item(items, index);
value = (const char *)list_get_item(values, index);
if (g_strcasecmp(item, rdp_layout) == 0)
{
strlcpy(client_info->layout, value,
sizeof(client_info->layout));
break;
}
}
}
list_delete(names);
list_delete(items);
list_delete(values);
@@ -756,8 +779,8 @@ xrdp_init_xkb_layout(struct xrdp_client_info *client_info)
}
// Initialise the rules and a few keycodes for xorgxrdp
snprintf(client_info->xkb_rules, sizeof(client_info->xkb_rules),
"%s", scancode_get_xkb_rules());
strlcpy(client_info->xkb_rules, scancode_get_xkb_rules(),
sizeof(client_info->xkb_rules));
if (keylayout_supports_caps_lock(client_info->keylayout))
{
client_info->x11_keycode_caps_lock =