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libserialport/windows.c

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/*
* This file is part of the libserialport project.
*
* Copyright (C) 2013-2014 Martin Ling <martin-libserialport@earth.li>
* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
*
* This program 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 3 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "libserialport_internal.h"
/* USB path is a string of at most 8 decimal numbers < 128 separated by dots. */
#define MAX_USB_PATH ((8 * 3) + (7 * 1) + 1)
static void enumerate_hub(struct sp_port *port, const char *hub_name,
const char *parent_path, DEVINST dev_inst);
static char *wc_to_utf8(PWCHAR wc_buffer, ULONG wc_bytes)
{
ULONG wc_length = wc_bytes / sizeof(WCHAR);
ULONG utf8_bytes;
WCHAR *wc_str = NULL;
char *utf8_str = NULL;
/* Allocate aligned wide char buffer */
if (!(wc_str = malloc((wc_length + 1) * sizeof(WCHAR))))
goto wc_to_utf8_end;
/* Zero-terminate the wide char string. */
memcpy(wc_str, wc_buffer, wc_bytes);
wc_str[wc_length] = 0;
/* Compute the size of the UTF-8 converted string. */
if (!(utf8_bytes = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
NULL, 0, NULL, NULL)))
goto wc_to_utf8_end;
/* Allocate UTF-8 output buffer. */
if (!(utf8_str = malloc(utf8_bytes)))
goto wc_to_utf8_end;
/* Actually converted to UTF-8. */
if (!WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
utf8_str, utf8_bytes, NULL, NULL)) {
free(utf8_str);
utf8_str = NULL;
goto wc_to_utf8_end;
}
wc_to_utf8_end:
if (wc_str)
free(wc_str);
return utf8_str;
}
static char *get_root_hub_name(HANDLE host_controller)
{
USB_ROOT_HUB_NAME root_hub_name;
PUSB_ROOT_HUB_NAME root_hub_name_wc;
char *root_hub_name_utf8;
ULONG size = 0;
/* Compute the size of the root hub name string. */
if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME, 0, 0,
&root_hub_name, sizeof(root_hub_name), &size, NULL))
return NULL;
/* Allocate wide char root hub name string. */
size = root_hub_name.ActualLength;
if (!(root_hub_name_wc = malloc(size)))
return NULL;
/* Actually get the root hub name string. */
if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME,
NULL, 0, root_hub_name_wc, size, &size, NULL)) {
free(root_hub_name_wc);
return NULL;
}
/* Convert the root hub name string to UTF-8. */
root_hub_name_utf8 = wc_to_utf8(root_hub_name_wc->RootHubName, size - offsetof(USB_ROOT_HUB_NAME, RootHubName));
free(root_hub_name_wc);
return root_hub_name_utf8;
}
static char *get_external_hub_name(HANDLE hub, ULONG connection_index)
{
USB_NODE_CONNECTION_NAME ext_hub_name;
PUSB_NODE_CONNECTION_NAME ext_hub_name_wc;
char *ext_hub_name_utf8;
ULONG size;
/* Compute the size of the external hub name string. */
ext_hub_name.ConnectionIndex = connection_index;
if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
&ext_hub_name, sizeof(ext_hub_name),
&ext_hub_name, sizeof(ext_hub_name), &size, NULL))
return NULL;
/* Allocate wide char external hub name string. */
size = ext_hub_name.ActualLength;
if (size <= sizeof(ext_hub_name)
|| !(ext_hub_name_wc = malloc(size)))
return NULL;
/* Get the name of the external hub attached to the specified port. */
ext_hub_name_wc->ConnectionIndex = connection_index;
if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
ext_hub_name_wc, size,
ext_hub_name_wc, size, &size, NULL)) {
free(ext_hub_name_wc);
return NULL;
}
/* Convert the external hub name string to UTF-8. */
ext_hub_name_utf8 = wc_to_utf8(ext_hub_name_wc->NodeName, size - offsetof(USB_NODE_CONNECTION_NAME, NodeName));
free(ext_hub_name_wc);
return ext_hub_name_utf8;
}
static char *get_string_descriptor(HANDLE hub_device, ULONG connection_index,
UCHAR descriptor_index)
{
char desc_req_buf[sizeof(USB_DESCRIPTOR_REQUEST) +
MAXIMUM_USB_STRING_LENGTH] = { 0 };
PUSB_DESCRIPTOR_REQUEST desc_req = (void *)desc_req_buf;
PUSB_STRING_DESCRIPTOR desc = (void *)(desc_req + 1);
ULONG size = sizeof(desc_req_buf);
desc_req->ConnectionIndex = connection_index;
desc_req->SetupPacket.wValue = (USB_STRING_DESCRIPTOR_TYPE << 8)
| descriptor_index;
desc_req->SetupPacket.wIndex = 0;
desc_req->SetupPacket.wLength = size - sizeof(*desc_req);
if (!DeviceIoControl(hub_device,
IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
desc_req, size, desc_req, size, &size, NULL)
|| size < 2
|| desc->bDescriptorType != USB_STRING_DESCRIPTOR_TYPE
|| desc->bLength != size - sizeof(*desc_req)
|| desc->bLength % 2)
return NULL;
return wc_to_utf8(desc->bString, desc->bLength - offsetof(USB_STRING_DESCRIPTOR, bString));
}
static void enumerate_hub_ports(struct sp_port *port, HANDLE hub_device,
ULONG nb_ports, const char *parent_path, DEVINST dev_inst)
{
char path[MAX_USB_PATH];
ULONG index = 0;
for (index = 1; index <= nb_ports; index++) {
PUSB_NODE_CONNECTION_INFORMATION_EX connection_info_ex;
ULONG size = sizeof(*connection_info_ex) + (30 * sizeof(USB_PIPE_INFO));
if (!(connection_info_ex = malloc(size)))
break;
connection_info_ex->ConnectionIndex = index;
if (!DeviceIoControl(hub_device,
IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
connection_info_ex, size,
connection_info_ex, size, &size, NULL)) {
/*
* Try to get CONNECTION_INFORMATION if
* CONNECTION_INFORMATION_EX did not work.
*/
PUSB_NODE_CONNECTION_INFORMATION connection_info;
size = sizeof(*connection_info) + (30 * sizeof(USB_PIPE_INFO));
if (!(connection_info = malloc(size))) {
free(connection_info_ex);
continue;
}
connection_info->ConnectionIndex = index;
if (!DeviceIoControl(hub_device,
IOCTL_USB_GET_NODE_CONNECTION_INFORMATION,
connection_info, size,
connection_info, size, &size, NULL)) {
free(connection_info);
free(connection_info_ex);
continue;
}
connection_info_ex->ConnectionIndex = connection_info->ConnectionIndex;
connection_info_ex->DeviceDescriptor = connection_info->DeviceDescriptor;
connection_info_ex->DeviceIsHub = connection_info->DeviceIsHub;
connection_info_ex->DeviceAddress = connection_info->DeviceAddress;
free(connection_info);
}
if (connection_info_ex->DeviceIsHub) {
/* Recursively enumerate external hub. */
PCHAR ext_hub_name;
if ((ext_hub_name = get_external_hub_name(hub_device, index))) {
snprintf(path, sizeof(path), "%s%ld.",
parent_path, connection_info_ex->ConnectionIndex);
enumerate_hub(port, ext_hub_name, path, dev_inst);
}
free(connection_info_ex);
} else {
snprintf(path, sizeof(path), "%s%ld",
parent_path, connection_info_ex->ConnectionIndex);
/* Check if this device is the one we search for. */
if (strcmp(path, port->usb_path)) {
free(connection_info_ex);
continue;
}
/* Finally grab detailed information regarding the device. */
port->usb_address = connection_info_ex->DeviceAddress + 1;
port->usb_vid = connection_info_ex->DeviceDescriptor.idVendor;
port->usb_pid = connection_info_ex->DeviceDescriptor.idProduct;
if (connection_info_ex->DeviceDescriptor.iManufacturer)
port->usb_manufacturer = get_string_descriptor(hub_device, index,
connection_info_ex->DeviceDescriptor.iManufacturer);
if (connection_info_ex->DeviceDescriptor.iProduct)
port->usb_product = get_string_descriptor(hub_device, index,
connection_info_ex->DeviceDescriptor.iProduct);
if (connection_info_ex->DeviceDescriptor.iSerialNumber) {
port->usb_serial = get_string_descriptor(hub_device, index,
connection_info_ex->DeviceDescriptor.iSerialNumber);
if (port->usb_serial == NULL) {
//composite device, get the parent's serial number
char device_id[MAX_DEVICE_ID_LEN];
if (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) {
if (CM_Get_Device_IDA(dev_inst, device_id, sizeof(device_id), 0) == CR_SUCCESS)
port->usb_serial = strdup(strrchr(device_id, '\\')+1);
}
}
}
free(connection_info_ex);
break;
}
}
}
static void enumerate_hub(struct sp_port *port, const char *hub_name,
const char *parent_path, DEVINST dev_inst)
{
USB_NODE_INFORMATION hub_info;
HANDLE hub_device;
ULONG size = sizeof(hub_info);
char *device_name;
/* Open the hub with its full name. */
if (!(device_name = malloc(strlen("\\\\.\\") + strlen(hub_name) + 1)))
return;
strcpy(device_name, "\\\\.\\");
strcat(device_name, hub_name);
hub_device = CreateFile(device_name, GENERIC_WRITE, FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
free(device_name);
if (hub_device == INVALID_HANDLE_VALUE)
return;
/* Get the number of ports of the hub. */
if (DeviceIoControl(hub_device, IOCTL_USB_GET_NODE_INFORMATION,
&hub_info, size, &hub_info, size, &size, NULL))
/* Enumerate the ports of the hub. */
enumerate_hub_ports(port, hub_device,
hub_info.u.HubInformation.HubDescriptor.bNumberOfPorts, parent_path, dev_inst);
CloseHandle(hub_device);
}
static void enumerate_host_controller(struct sp_port *port,
HANDLE host_controller_device,
DEVINST dev_inst)
{
char *root_hub_name;
if ((root_hub_name = get_root_hub_name(host_controller_device))) {
enumerate_hub(port, root_hub_name, "", dev_inst);
free(root_hub_name);
}
}
static void get_usb_details(struct sp_port *port, DEVINST dev_inst_match)
{
HDEVINFO device_info;
SP_DEVINFO_DATA device_info_data;
ULONG i, size = 0;
device_info = SetupDiGetClassDevs(&GUID_CLASS_USB_HOST_CONTROLLER, NULL, NULL,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
device_info_data.cbSize = sizeof(device_info_data);
for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
SP_DEVICE_INTERFACE_DATA device_interface_data;
PSP_DEVICE_INTERFACE_DETAIL_DATA device_detail_data;
DEVINST dev_inst = dev_inst_match;
HANDLE host_controller_device;
device_interface_data.cbSize = sizeof(device_interface_data);
if (!SetupDiEnumDeviceInterfaces(device_info, 0,
&GUID_CLASS_USB_HOST_CONTROLLER,
i, &device_interface_data))
continue;
if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
NULL, 0, &size, NULL)
&& GetLastError() != ERROR_INSUFFICIENT_BUFFER)
continue;
if (!(device_detail_data = malloc(size)))
continue;
device_detail_data->cbSize = sizeof(*device_detail_data);
if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
device_detail_data, size, &size,
NULL)) {
free(device_detail_data);
continue;
}
while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS
&& dev_inst != device_info_data.DevInst) { }
if (dev_inst != device_info_data.DevInst) {
free(device_detail_data);
continue;
}
port->usb_bus = i + 1;
host_controller_device = CreateFile(device_detail_data->DevicePath,
GENERIC_WRITE, FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
if (host_controller_device != INVALID_HANDLE_VALUE) {
enumerate_host_controller(port, host_controller_device, dev_inst_match);
CloseHandle(host_controller_device);
}
free(device_detail_data);
}
SetupDiDestroyDeviceInfoList(device_info);
return;
}
SP_PRIV enum sp_return get_port_details(struct sp_port *port)
{
/*
* Description limited to 127 char, anything longer
* would not be user friendly anyway.
*/
char description[128];
SP_DEVINFO_DATA device_info_data = { .cbSize = sizeof(device_info_data) };
HDEVINFO device_info;
int i;
device_info = SetupDiGetClassDevs(NULL, 0, 0,
DIGCF_PRESENT | DIGCF_ALLCLASSES);
if (device_info == INVALID_HANDLE_VALUE)
RETURN_FAIL("SetupDiGetClassDevs() failed");
for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
HKEY device_key;
DEVINST dev_inst;
char value[8], class[16];
DWORD size, type;
CONFIGRET cr;
/* Check if this is the device we are looking for. */
device_key = SetupDiOpenDevRegKey(device_info, &device_info_data,
DICS_FLAG_GLOBAL, 0,
DIREG_DEV, KEY_QUERY_VALUE);
if (device_key == INVALID_HANDLE_VALUE)
continue;
size = sizeof(value);
if (RegQueryValueExA(device_key, "PortName", NULL, &type, (LPBYTE)value,
&size) != ERROR_SUCCESS || type != REG_SZ) {
RegCloseKey(device_key);
continue;
}
RegCloseKey(device_key);
value[sizeof(value) - 1] = 0;
if (strcmp(value, port->name))
continue;
/* Check port transport type. */
dev_inst = device_info_data.DevInst;
size = sizeof(class);
cr = CR_FAILURE;
while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS &&
(cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
CM_DRP_CLASS, 0, class, &size, 0)) != CR_SUCCESS) { }
if (cr == CR_SUCCESS) {
if (!strcmp(class, "USB"))
port->transport = SP_TRANSPORT_USB;
}
/* Get port description (friendly name). */
dev_inst = device_info_data.DevInst;
size = sizeof(description);
while ((cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
CM_DRP_FRIENDLYNAME, 0, description, &size, 0)) != CR_SUCCESS
&& CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) { }
if (cr == CR_SUCCESS)
port->description = strdup(description);
/* Get more informations for USB connected ports. */
if (port->transport == SP_TRANSPORT_USB) {
char usb_path[MAX_USB_PATH] = "", tmp[MAX_USB_PATH];
char device_id[MAX_DEVICE_ID_LEN];
/* Recurse over parents to build the USB device path. */
dev_inst = device_info_data.DevInst;
do {
/* Verify that this layer of the tree is USB related. */
if (CM_Get_Device_IDA(dev_inst, device_id,
sizeof(device_id), 0) != CR_SUCCESS
|| strncmp(device_id, "USB\\", 4))
continue;
/* Discard one layer for composite devices. */
char compat_ids[512], *p = compat_ids;
size = sizeof(compat_ids);
if (CM_Get_DevNode_Registry_PropertyA(dev_inst,
CM_DRP_COMPATIBLEIDS, 0,
&compat_ids,
&size, 0) == CR_SUCCESS) {
while (*p) {
if (!strncmp(p, "USB\\COMPOSITE", 13))
break;
p += strlen(p) + 1;
}
if (*p)
continue;
}
/* Stop the recursion when reaching the USB root. */
if (!strncmp(device_id, "USB\\ROOT", 8))
break;
/* Prepend the address of current USB layer to the USB path. */
DWORD address;
size = sizeof(address);
if (CM_Get_DevNode_Registry_PropertyA(dev_inst, CM_DRP_ADDRESS,
0, &address, &size, 0) == CR_SUCCESS) {
strcpy(tmp, usb_path);
snprintf(usb_path, sizeof(usb_path), "%d%s%s",
(int)address, *tmp ? "." : "", tmp);
}
} while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS);
port->usb_path = strdup(usb_path);
/* Wake up the USB device to be able to read string descriptor. */
char *escaped_port_name;
HANDLE handle;
if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
sprintf(escaped_port_name, "\\\\.\\%s", port->name);
handle = CreateFile(escaped_port_name, GENERIC_READ, 0, 0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED, 0);
free(escaped_port_name);
CloseHandle(handle);
/* Retrieve USB device details from the device descriptor. */
get_usb_details(port, device_info_data.DevInst);
}
break;
}
SetupDiDestroyDeviceInfoList(device_info);
RETURN_OK();
}
SP_PRIV enum sp_return list_ports(struct sp_port ***list)
{
HKEY key;
TCHAR *value, *data;
DWORD max_value_len, max_data_size, max_data_len;
DWORD value_len, data_size, data_len;
DWORD type, index = 0;
LSTATUS result;
char *name;
int name_len;
int ret = SP_OK;
DEBUG("Opening registry key");
if ((result = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
0, KEY_QUERY_VALUE, &key)) != ERROR_SUCCESS) {
/* It's possible for this key to not exist if there are no serial ports
* at all. In that case we're done. Return a failure for any other error. */
if (result != ERROR_FILE_NOT_FOUND) {
SetLastError(result);
SET_FAIL(ret, "RegOpenKeyEx() failed");
}
goto out_done;
}
DEBUG("Querying registry key value and data sizes");
if ((result = RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
&max_value_len, &max_data_size, NULL, NULL)) != ERROR_SUCCESS) {
SetLastError(result);
SET_FAIL(ret, "RegQueryInfoKey() failed");
goto out_close;
}
max_data_len = max_data_size / sizeof(TCHAR);
if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
SET_ERROR(ret, SP_ERR_MEM, "Registry value malloc failed");
goto out_close;
}
if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
SET_ERROR(ret, SP_ERR_MEM, "Registry data malloc failed");
goto out_free_value;
}
DEBUG("Iterating over values");
while (
value_len = max_value_len + 1,
data_size = max_data_size,
RegEnumValue(key, index, value, &value_len,
NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
{
if (type == REG_SZ) {
data_len = data_size / sizeof(TCHAR);
data[data_len] = '\0';
#ifdef UNICODE
name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL);
#else
name_len = data_len + 1;
#endif
if (!(name = malloc(name_len))) {
SET_ERROR(ret, SP_ERR_MEM, "Registry port name malloc failed");
goto out;
}
#ifdef UNICODE
WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
#else
strcpy(name, data);
#endif
DEBUG_FMT("Found port %s", name);
if (!(*list = list_append(*list, name))) {
SET_ERROR(ret, SP_ERR_MEM, "List append failed");
free(name);
goto out;
}
free(name);
}
index++;
}
out:
free(data);
out_free_value:
free(value);
out_close:
RegCloseKey(key);
out_done:
return ret;
}
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