diff options
Diffstat (limited to 'src/udev/udev-builtin-usb_id.c')
| -rw-r--r-- | src/udev/udev-builtin-usb_id.c | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-usb_id.c b/src/udev/udev-builtin-usb_id.c new file mode 100644 index 0000000..8e83c9c --- /dev/null +++ b/src/udev/udev-builtin-usb_id.c @@ -0,0 +1,489 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * USB device properties and persistent device path + * + * Copyright (c) 2005 SUSE Linux Products GmbH, Germany + * Author: Hannes Reinecke <hare@suse.de> + */ + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <stdarg.h> +#include <stdio.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "device-nodes.h" +#include "device-util.h" +#include "fd-util.h" +#include "parse-util.h" +#include "string-util.h" +#include "strxcpyx.h" +#include "udev-builtin.h" +#include "udev-util.h" + +static void set_usb_iftype(char *to, int if_class_num, size_t len) { + const char *type = "generic"; + + switch (if_class_num) { + case 1: + type = "audio"; + break; + case 2: /* CDC-Control */ + break; + case 3: + type = "hid"; + break; + case 5: /* Physical */ + break; + case 6: + type = "media"; + break; + case 7: + type = "printer"; + break; + case 8: + type = "storage"; + break; + case 9: + type = "hub"; + break; + case 0x0a: /* CDC-Data */ + break; + case 0x0b: /* Chip/Smart Card */ + break; + case 0x0d: /* Content Security */ + break; + case 0x0e: + type = "video"; + break; + case 0xdc: /* Diagnostic Device */ + break; + case 0xe0: /* Wireless Controller */ + break; + case 0xfe: /* Application-specific */ + break; + case 0xff: /* Vendor-specific */ + break; + default: + break; + } + strncpy(to, type, len); + to[len-1] = '\0'; +} + +static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len) { + int type_num = 0; + const char *type = "generic"; + + if (safe_atoi(from, &type_num) >= 0) { + switch (type_num) { + case 1: /* RBC devices */ + type = "rbc"; + break; + case 2: + type = "atapi"; + break; + case 3: + type = "tape"; + break; + case 4: /* UFI */ + type = "floppy"; + break; + case 6: /* Transparent SPC-2 devices */ + type = "scsi"; + break; + default: + break; + } + } + strscpy(to, len, type); + return type_num; +} + +static void set_scsi_type(char *to, const char *from, size_t len) { + unsigned type_num; + const char *type = "generic"; + + if (safe_atou(from, &type_num) >= 0) { + switch (type_num) { + case 0: + case 0xe: + type = "disk"; + break; + case 1: + type = "tape"; + break; + case 4: + case 7: + case 0xf: + type = "optical"; + break; + case 5: + type = "cd"; + break; + default: + break; + } + } + strscpy(to, len, type); +} + +#define USB_DT_DEVICE 0x01 +#define USB_DT_INTERFACE 0x04 + +static int dev_if_packed_info(sd_device *dev, char *ifs_str, size_t len) { + _cleanup_close_ int fd = -EBADF; + ssize_t size; + unsigned char buf[18 + 65535]; + size_t pos = 0; + unsigned strpos = 0; + const char *filename, *syspath; + int r; + struct usb_interface_descriptor { + uint8_t bLength; + uint8_t bDescriptorType; + uint8_t bInterfaceNumber; + uint8_t bAlternateSetting; + uint8_t bNumEndpoints; + uint8_t bInterfaceClass; + uint8_t bInterfaceSubClass; + uint8_t bInterfaceProtocol; + uint8_t iInterface; + } _packed_; + + r = sd_device_get_syspath(dev, &syspath); + if (r < 0) + return r; + + filename = strjoina(syspath, "/descriptors"); + fd = open(filename, O_RDONLY|O_CLOEXEC|O_NOCTTY); + if (fd < 0) + return log_device_debug_errno(dev, errno, "Failed to open \"%s\": %m", filename); + + size = read(fd, buf, sizeof(buf)); + if (size < 18) + return log_device_warning_errno(dev, SYNTHETIC_ERRNO(EIO), + "Short read from \"%s\"", filename); + assert((size_t) size <= sizeof buf); + + ifs_str[0] = '\0'; + while (pos + sizeof(struct usb_interface_descriptor) < (size_t) size && + strpos + 7 < len - 2) { + + struct usb_interface_descriptor *desc; + char if_str[8]; + + desc = (struct usb_interface_descriptor *) (buf + pos); + if (desc->bLength < 3) + break; + if (desc->bLength > size - sizeof(struct usb_interface_descriptor)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EIO), + "Corrupt data read from \"%s\"", filename); + pos += desc->bLength; + + if (desc->bDescriptorType != USB_DT_INTERFACE) + continue; + + if (snprintf(if_str, 8, ":%02x%02x%02x", + desc->bInterfaceClass, + desc->bInterfaceSubClass, + desc->bInterfaceProtocol) != 7) + continue; + + if (strstr(ifs_str, if_str)) + continue; + + memcpy(&ifs_str[strpos], if_str, 8), + strpos += 7; + } + + if (strpos > 0) { + ifs_str[strpos++] = ':'; + ifs_str[strpos++] = '\0'; + } + + return 0; +} + +/* + * A unique USB identification is generated like this: + * + * 1.) Get the USB device type from InterfaceClass and InterfaceSubClass + * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC', + * use the SCSI vendor and model as USB-Vendor and USB-model. + * 3.) Otherwise, use the USB manufacturer and product as + * USB-Vendor and USB-model. Any non-printable characters + * in those strings will be skipped; a slash '/' will be converted + * into a full stop '.'. + * 4.) If that fails, too, we will use idVendor and idProduct + * as USB-Vendor and USB-model. + * 5.) The USB identification is the USB-vendor and USB-model + * string concatenated with an underscore '_'. + * 6.) If the device supplies a serial number, this number + * is concatenated with the identification with an underscore '_'. + */ +static int builtin_usb_id(UdevEvent *event, int argc, char *argv[], bool test) { + sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev); + char vendor_str[64] = ""; + char vendor_str_enc[256]; + const char *vendor_id; + char model_str[64] = ""; + char model_str_enc[256]; + const char *product_id; + char serial_str[UDEV_NAME_SIZE] = ""; + char packed_if_str[UDEV_NAME_SIZE] = ""; + char revision_str[64] = ""; + char type_str[64] = ""; + char instance_str[64] = ""; + const char *ifnum = NULL; + const char *driver = NULL; + char serial[256]; + + sd_device *dev_interface, *dev_usb; + const char *if_class, *if_subclass; + unsigned if_class_num; + int protocol = 0; + size_t l; + char *s; + + const char *syspath, *sysname, *devtype, *interface_syspath; + int r; + + r = sd_device_get_syspath(dev, &syspath); + if (r < 0) + return r; + + r = sd_device_get_sysname(dev, &sysname); + if (r < 0) + return r; + + /* shortcut, if we are called directly for a "usb_device" type */ + if (sd_device_get_devtype(dev, &devtype) >= 0 && streq(devtype, "usb_device")) { + dev_if_packed_info(dev, packed_if_str, sizeof(packed_if_str)); + dev_usb = dev; + goto fallback; + } + + /* usb interface directory */ + r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &dev_interface); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to access usb_interface: %m"); + + r = sd_device_get_syspath(dev_interface, &interface_syspath); + if (r < 0) + return log_device_debug_errno(dev_interface, r, "Failed to get syspath: %m"); + (void) sd_device_get_sysattr_value(dev_interface, "bInterfaceNumber", &ifnum); + (void) sd_device_get_sysattr_value(dev_interface, "driver", &driver); + + r = sd_device_get_sysattr_value(dev_interface, "bInterfaceClass", &if_class); + if (r < 0) + return log_device_debug_errno(dev_interface, r, "Failed to get bInterfaceClass attribute: %m"); + + r = safe_atou_full(if_class, 16, &if_class_num); + if (r < 0) + return log_device_debug_errno(dev_interface, r, "Failed to parse if_class: %m"); + if (if_class_num == 8) { + /* mass storage */ + if (sd_device_get_sysattr_value(dev_interface, "bInterfaceSubClass", &if_subclass) >= 0) + protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1); + } else + set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1); + + log_device_debug(dev_interface, "if_class:%u protocol:%i", if_class_num, protocol); + + /* usb device directory */ + r = sd_device_get_parent_with_subsystem_devtype(dev_interface, "usb", "usb_device", &dev_usb); + if (r < 0) + return log_device_debug_errno(dev_interface, r, "Failed to find parent 'usb' device"); + + /* all interfaces of the device in a single string */ + dev_if_packed_info(dev_usb, packed_if_str, sizeof(packed_if_str)); + + /* mass storage : SCSI or ATAPI */ + if (IN_SET(protocol, 6, 2)) { + sd_device *dev_scsi; + const char *scsi_sysname, *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev; + int host, bus, target, lun; + + /* get scsi device */ + r = sd_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device", &dev_scsi); + if (r < 0) { + log_device_debug_errno(dev, r, "Unable to find parent SCSI device"); + goto fallback; + } + if (sd_device_get_sysname(dev_scsi, &scsi_sysname) < 0) + goto fallback; + if (sscanf(scsi_sysname, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) { + log_device_debug(dev_scsi, "Invalid SCSI device"); + goto fallback; + } + + /* Generic SPC-2 device */ + r = sd_device_get_sysattr_value(dev_scsi, "vendor", &scsi_vendor); + if (r < 0) { + log_device_debug_errno(dev_scsi, r, "Failed to get SCSI vendor attribute: %m"); + goto fallback; + } + encode_devnode_name(scsi_vendor, vendor_str_enc, sizeof(vendor_str_enc)); + udev_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1); + udev_replace_chars(vendor_str, NULL); + + r = sd_device_get_sysattr_value(dev_scsi, "model", &scsi_model); + if (r < 0) { + log_device_debug_errno(dev_scsi, r, "Failed to get SCSI model attribute: %m"); + goto fallback; + } + encode_devnode_name(scsi_model, model_str_enc, sizeof(model_str_enc)); + udev_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1); + udev_replace_chars(model_str, NULL); + + r = sd_device_get_sysattr_value(dev_scsi, "type", &scsi_type); + if (r < 0) { + log_device_debug_errno(dev_scsi, r, "Failed to get SCSI type attribute: %m"); + goto fallback; + } + set_scsi_type(type_str, scsi_type, sizeof(type_str)-1); + + r = sd_device_get_sysattr_value(dev_scsi, "rev", &scsi_rev); + if (r < 0) { + log_device_debug_errno(dev_scsi, r, "Failed to get SCSI revision attribute: %m"); + goto fallback; + } + udev_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1); + udev_replace_chars(revision_str, NULL); + + /* + * some broken devices have the same identifiers + * for all luns, export the target:lun number + */ + sprintf(instance_str, "%d:%d", target, lun); + } + +fallback: + r = sd_device_get_sysattr_value(dev_usb, "idVendor", &vendor_id); + if (r < 0) + return log_device_debug_errno(dev_usb, r, "Failed to get idVendor attribute: %m"); + + r = sd_device_get_sysattr_value(dev_usb, "idProduct", &product_id); + if (r < 0) + return log_device_debug_errno(dev_usb, r, "Failed to get idProduct attribute: %m"); + + /* fall back to USB vendor & device */ + if (vendor_str[0] == '\0') { + const char *usb_vendor; + + if (sd_device_get_sysattr_value(dev_usb, "manufacturer", &usb_vendor) < 0) + usb_vendor = vendor_id; + encode_devnode_name(usb_vendor, vendor_str_enc, sizeof(vendor_str_enc)); + udev_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1); + udev_replace_chars(vendor_str, NULL); + } + + if (model_str[0] == '\0') { + const char *usb_model; + + if (sd_device_get_sysattr_value(dev_usb, "product", &usb_model) < 0) + usb_model = product_id; + encode_devnode_name(usb_model, model_str_enc, sizeof(model_str_enc)); + udev_replace_whitespace(usb_model, model_str, sizeof(model_str)-1); + udev_replace_chars(model_str, NULL); + } + + if (revision_str[0] == '\0') { + const char *usb_rev; + + if (sd_device_get_sysattr_value(dev_usb, "bcdDevice", &usb_rev) >= 0) { + udev_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1); + udev_replace_chars(revision_str, NULL); + } + } + + if (serial_str[0] == '\0') { + const char *usb_serial; + + if (sd_device_get_sysattr_value(dev_usb, "serial", &usb_serial) >= 0) { + /* http://msdn.microsoft.com/en-us/library/windows/hardware/gg487321.aspx */ + for (const unsigned char *p = (unsigned char*) usb_serial; *p != '\0'; p++) + if (*p < 0x20 || *p > 0x7f || *p == ',') { + usb_serial = NULL; + break; + } + + if (usb_serial) { + udev_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1); + udev_replace_chars(serial_str, NULL); + } + } + } + + s = serial; + l = strpcpyl(&s, sizeof(serial), vendor_str, "_", model_str, NULL); + if (!isempty(serial_str)) + l = strpcpyl(&s, l, "_", serial_str, NULL); + + if (!isempty(instance_str)) + strpcpyl(&s, l, "-", instance_str, NULL); + + if (sd_device_get_property_value(dev, "ID_BUS", NULL) >= 0) + log_device_debug(dev, "ID_BUS property is already set, setting only properties prefixed with \"ID_USB_\"."); + else { + udev_builtin_add_property(dev, test, "ID_BUS", "usb"); + + udev_builtin_add_property(dev, test, "ID_MODEL", model_str); + udev_builtin_add_property(dev, test, "ID_MODEL_ENC", model_str_enc); + udev_builtin_add_property(dev, test, "ID_MODEL_ID", product_id); + + udev_builtin_add_property(dev, test, "ID_SERIAL", serial); + if (!isempty(serial_str)) + udev_builtin_add_property(dev, test, "ID_SERIAL_SHORT", serial_str); + + udev_builtin_add_property(dev, test, "ID_VENDOR", vendor_str); + udev_builtin_add_property(dev, test, "ID_VENDOR_ENC", vendor_str_enc); + udev_builtin_add_property(dev, test, "ID_VENDOR_ID", vendor_id); + + udev_builtin_add_property(dev, test, "ID_REVISION", revision_str); + + if (!isempty(type_str)) + udev_builtin_add_property(dev, test, "ID_TYPE", type_str); + + if (!isempty(instance_str)) + udev_builtin_add_property(dev, test, "ID_INSTANCE", instance_str); + } + + /* Also export the same values in the above by prefixing ID_USB_. */ + udev_builtin_add_property(dev, test, "ID_USB_MODEL", model_str); + udev_builtin_add_property(dev, test, "ID_USB_MODEL_ENC", model_str_enc); + udev_builtin_add_property(dev, test, "ID_USB_MODEL_ID", product_id); + udev_builtin_add_property(dev, test, "ID_USB_SERIAL", serial); + if (!isempty(serial_str)) + udev_builtin_add_property(dev, test, "ID_USB_SERIAL_SHORT", serial_str); + + udev_builtin_add_property(dev, test, "ID_USB_VENDOR", vendor_str); + udev_builtin_add_property(dev, test, "ID_USB_VENDOR_ENC", vendor_str_enc); + udev_builtin_add_property(dev, test, "ID_USB_VENDOR_ID", vendor_id); + + udev_builtin_add_property(dev, test, "ID_USB_REVISION", revision_str); + + if (!isempty(type_str)) + udev_builtin_add_property(dev, test, "ID_USB_TYPE", type_str); + + if (!isempty(instance_str)) + udev_builtin_add_property(dev, test, "ID_USB_INSTANCE", instance_str); + + if (!isempty(packed_if_str)) + udev_builtin_add_property(dev, test, "ID_USB_INTERFACES", packed_if_str); + if (ifnum) + udev_builtin_add_property(dev, test, "ID_USB_INTERFACE_NUM", ifnum); + if (driver) + udev_builtin_add_property(dev, test, "ID_USB_DRIVER", driver); + return 0; +} + +const UdevBuiltin udev_builtin_usb_id = { + .name = "usb_id", + .cmd = builtin_usb_id, + .help = "USB device properties", + .run_once = true, +}; |