a6856129ec
path_prepend returned a status code, but it wasn't looked at anywhere. Adding checks for the return value in all the bazillion places where it is called is not very attractive, so let's just make the whole program abort cleanly if the (very unlikely) oom is encountered.
709 lines
24 KiB
C
709 lines
24 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* compose persistent device path
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*
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* Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
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*
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* Logic based on Hannes Reinecke's shell script.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "string-util.h"
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#include "sysexits.h"
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#include "udev.h"
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#include "udev-util.h"
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_printf_(2,3)
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static void path_prepend(char **path, const char *fmt, ...) {
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va_list va;
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_cleanup_free_ char *pre = NULL;
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int r;
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va_start(va, fmt);
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r = vasprintf(&pre, fmt, va);
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va_end(va);
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if (r < 0) {
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log_oom();
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exit(EX_OSERR);
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}
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if (*path) {
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char *new;
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new = strjoin(pre, "-", *path);
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if (!new) {
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log_oom();
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exit(EX_OSERR);
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}
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free_and_replace(*path, new);
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} else {
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*path = pre;
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pre = NULL;
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}
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}
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/*
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** Linux only supports 32 bit luns.
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** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details.
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*/
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static void format_lun_number(struct udev_device *dev, char **path) {
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unsigned long lun = strtoul(udev_device_get_sysnum(dev), NULL, 10);
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if (lun < 256)
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/* address method 0, peripheral device addressing with bus id of zero */
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path_prepend(path, "lun-%lu", lun);
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else
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/* handle all other lun addressing methods by using a variant of the original lun format */
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path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff);
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}
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static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) {
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struct udev_device *parent = dev;
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assert(dev);
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assert(subsys);
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while (parent) {
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const char *subsystem;
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subsystem = udev_device_get_subsystem(parent);
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if (!streq_ptr(subsystem, subsys))
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break;
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dev = parent;
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parent = udev_device_get_parent(parent);
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}
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return dev;
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}
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static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev;
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_cleanup_udev_device_unref_ struct udev_device *fcdev = NULL;
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const char *port;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
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if (!fcdev)
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return NULL;
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port = udev_device_get_sysattr_value(fcdev, "port_name");
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if (!port)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "fc-%s-%s", port, lun);
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return parent;
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}
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static struct udev_device *handle_scsi_sas_wide_port(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev, *target_parent;
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_cleanup_udev_device_unref_ struct udev_device *sasdev = NULL;
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const char *sas_address;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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sasdev = udev_device_new_from_subsystem_sysname(udev, "sas_device",
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udev_device_get_sysname(target_parent));
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if (!sasdev)
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return NULL;
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sas_address = udev_device_get_sysattr_value(sasdev, "sas_address");
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if (!sas_address)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "sas-%s-%s", sas_address, lun);
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return parent;
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}
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static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
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{
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struct udev *udev;
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struct udev_device *targetdev, *target_parent, *port, *expander;
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_cleanup_udev_device_unref_ struct udev_device
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*target_sasdev = NULL, *expander_sasdev = NULL, *port_sasdev = NULL;
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const char *sas_address = NULL;
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const char *phy_id;
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const char *phy_count;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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/* Get sas device */
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target_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_device", udev_device_get_sysname(target_parent));
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if (!target_sasdev)
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return NULL;
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/* The next parent is sas port */
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port = udev_device_get_parent(target_parent);
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if (!port)
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return NULL;
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/* Get port device */
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port_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_port", udev_device_get_sysname(port));
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phy_count = udev_device_get_sysattr_value(port_sasdev, "num_phys");
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if (!phy_count)
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return NULL;
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/* Check if we are simple disk */
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if (strncmp(phy_count, "1", 2) != 0)
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return handle_scsi_sas_wide_port(parent, path);
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/* Get connected phy */
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phy_id = udev_device_get_sysattr_value(target_sasdev, "phy_identifier");
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if (!phy_id)
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return NULL;
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/* The port's parent is either hba or expander */
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expander = udev_device_get_parent(port);
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if (!expander)
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return NULL;
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/* Get expander device */
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expander_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_device", udev_device_get_sysname(expander));
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if (expander_sasdev) {
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/* Get expander's address */
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sas_address = udev_device_get_sysattr_value(expander_sasdev,
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"sas_address");
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if (!sas_address)
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return NULL;
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}
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format_lun_number(parent, &lun);
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if (sas_address)
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path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun);
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else
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path_prepend(path, "sas-phy%s-%s", phy_id, lun);
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return parent;
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}
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static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *transportdev;
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_cleanup_udev_device_unref_ struct udev_device
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*sessiondev = NULL, *conndev = NULL;
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const char *target, *connname, *addr, *port;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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/* find iscsi session */
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transportdev = parent;
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for (;;) {
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transportdev = udev_device_get_parent(transportdev);
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if (!transportdev)
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return NULL;
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if (startswith(udev_device_get_sysname(transportdev), "session"))
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break;
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}
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/* find iscsi session device */
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sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
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if (!sessiondev)
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return NULL;
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target = udev_device_get_sysattr_value(sessiondev, "targetname");
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if (!target)
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return NULL;
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connname = strjoina("connection", udev_device_get_sysnum(transportdev), ":0");
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conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
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if (!conndev)
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return NULL;
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addr = udev_device_get_sysattr_value(conndev, "persistent_address");
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port = udev_device_get_sysattr_value(conndev, "persistent_port");
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if (!addr || !port)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun);
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return parent;
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}
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static struct udev_device *handle_scsi_ata(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev, *target_parent;
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_cleanup_udev_device_unref_ struct udev_device *atadev = NULL;
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const char *port_no;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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atadev = udev_device_new_from_subsystem_sysname(udev, "ata_port", udev_device_get_sysname(target_parent));
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if (!atadev)
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return NULL;
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port_no = udev_device_get_sysattr_value(atadev, "port_no");
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if (!port_no)
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return NULL;
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path_prepend(path, "ata-%s", port_no);
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return parent;
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}
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static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) {
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struct udev_device *hostdev;
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int host, bus, target, lun;
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const char *name, *base, *pos;
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *dent;
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int basenum = -1;
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assert(parent);
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assert(path);
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hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!hostdev)
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return NULL;
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name = udev_device_get_sysname(parent);
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if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
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return NULL;
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/*
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* Rebase host offset to get the local relative number
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*
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* Note: This is by definition racy, unreliable and too simple.
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* Please do not copy this model anywhere. It's just a left-over
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* from the time we had no idea how things should look like in
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* the end.
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*
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* Making assumptions about a global in-kernel counter and use
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* that to calculate a local offset is a very broken concept. It
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* can only work as long as things are in strict order.
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*
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* The kernel needs to export the instance/port number of a
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* controller directly, without the need for rebase magic like
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* this. Manual driver unbind/bind, parallel hotplug/unplug will
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* get into the way of this "I hope it works" logic.
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*/
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base = udev_device_get_syspath(hostdev);
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pos = strrchr(base, '/');
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if (!pos)
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return NULL;
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base = strndupa(base, pos - base);
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dir = opendir(base);
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if (!dir)
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return NULL;
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FOREACH_DIRENT_ALL(dent, dir, break) {
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char *rest;
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int i;
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if (dent->d_name[0] == '.')
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continue;
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if (!IN_SET(dent->d_type, DT_DIR, DT_LNK))
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continue;
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if (!startswith(dent->d_name, "host"))
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continue;
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i = strtoul(&dent->d_name[4], &rest, 10);
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if (rest[0] != '\0')
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continue;
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/*
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* find the smallest number; the host really needs to export its
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* own instance number per parent device; relying on the global host
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* enumeration and plainly rebasing the numbers sounds unreliable
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*/
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if (basenum == -1 || i < basenum)
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basenum = i;
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}
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if (basenum == -1)
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return hostdev;
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host -= basenum;
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path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
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return hostdev;
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}
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static struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path) {
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struct udev_device *hostdev;
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struct udev_device *vmbusdev;
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const char *guid_str;
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_cleanup_free_ char *lun = NULL;
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char guid[38];
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size_t i, k;
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assert(parent);
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assert(path);
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hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!hostdev)
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return NULL;
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vmbusdev = udev_device_get_parent(hostdev);
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if (!vmbusdev)
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return NULL;
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guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id");
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if (!guid_str)
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return NULL;
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if (strlen(guid_str) < 37 || guid_str[0] != '{' || guid_str[36] != '}')
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return NULL;
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for (i = 1, k = 0; i < 36; i++) {
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if (guid_str[i] == '-')
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continue;
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guid[k++] = guid_str[i];
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}
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guid[k] = '\0';
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format_lun_number(parent, &lun);
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path_prepend(path, "vmbus-%s-%s", guid, lun);
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return parent;
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}
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static struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) {
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const char *devtype, *id, *name;
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devtype = udev_device_get_devtype(parent);
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if (!streq_ptr(devtype, "scsi_device"))
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return parent;
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/* firewire */
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id = udev_device_get_sysattr_value(parent, "ieee1394_id");
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if (id) {
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path_prepend(path, "ieee1394-0x%s", id);
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*supported_parent = true;
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return skip_subsystem(parent, "scsi");
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}
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/* scsi sysfs does not have a "subsystem" for the transport */
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name = udev_device_get_syspath(parent);
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if (strstr(name, "/rport-")) {
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*supported_parent = true;
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return handle_scsi_fibre_channel(parent, path);
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}
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if (strstr(name, "/end_device-")) {
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*supported_parent = true;
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return handle_scsi_sas(parent, path);
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}
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if (strstr(name, "/session")) {
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*supported_parent = true;
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return handle_scsi_iscsi(parent, path);
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}
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if (strstr(name, "/ata"))
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return handle_scsi_ata(parent, path);
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if (strstr(name, "/vmbus_"))
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return handle_scsi_hyperv(parent, path);
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return handle_scsi_default(parent, path);
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}
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static struct udev_device *handle_cciss(struct udev_device *parent, char **path) {
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const char *str;
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unsigned int controller, disk;
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str = udev_device_get_sysname(parent);
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if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2)
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return NULL;
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path_prepend(path, "cciss-disk%u", disk);
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return skip_subsystem(parent, "cciss");
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}
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static void handle_scsi_tape(struct udev_device *dev, char **path) {
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const char *name;
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/* must be the last device in the syspath */
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if (*path)
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return;
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name = udev_device_get_sysname(dev);
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if (startswith(name, "nst") && strchr("lma", name[3]))
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path_prepend(path, "nst%c", name[3]);
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else if (startswith(name, "st") && strchr("lma", name[2]))
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path_prepend(path, "st%c", name[2]);
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}
|
|
|
|
static struct udev_device *handle_usb(struct udev_device *parent, char **path) {
|
|
const char *devtype, *str, *port;
|
|
|
|
devtype = udev_device_get_devtype(parent);
|
|
if (!devtype)
|
|
return parent;
|
|
if (!STR_IN_SET(devtype, "usb_interface", "usb_device"))
|
|
return parent;
|
|
|
|
str = udev_device_get_sysname(parent);
|
|
port = strchr(str, '-');
|
|
if (!port)
|
|
return parent;
|
|
port++;
|
|
|
|
path_prepend(path, "usb-0:%s", port);
|
|
return skip_subsystem(parent, "usb");
|
|
}
|
|
|
|
static struct udev_device *handle_bcma(struct udev_device *parent, char **path) {
|
|
const char *sysname;
|
|
unsigned int core;
|
|
|
|
sysname = udev_device_get_sysname(parent);
|
|
if (sscanf(sysname, "bcma%*u:%u", &core) != 1)
|
|
return NULL;
|
|
|
|
path_prepend(path, "bcma-%u", core);
|
|
return parent;
|
|
}
|
|
|
|
/* Handle devices of AP bus in System z platform. */
|
|
static struct udev_device *handle_ap(struct udev_device *parent, char **path) {
|
|
const char *type, *func;
|
|
|
|
assert(parent);
|
|
assert(path);
|
|
|
|
type = udev_device_get_sysattr_value(parent, "type");
|
|
func = udev_device_get_sysattr_value(parent, "ap_functions");
|
|
|
|
if (type && func)
|
|
path_prepend(path, "ap-%s-%s", type, func);
|
|
else
|
|
path_prepend(path, "ap-%s", udev_device_get_sysname(parent));
|
|
|
|
return skip_subsystem(parent, "ap");
|
|
}
|
|
|
|
static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool test) {
|
|
struct udev_device *parent;
|
|
_cleanup_free_ char *path = NULL;
|
|
bool supported_transport = false;
|
|
bool supported_parent = false;
|
|
|
|
assert(dev);
|
|
|
|
/* walk up the chain of devices and compose path */
|
|
parent = dev;
|
|
while (parent) {
|
|
const char *subsys;
|
|
|
|
subsys = udev_device_get_subsystem(parent);
|
|
if (!subsys) {
|
|
;
|
|
} else if (streq(subsys, "scsi_tape")) {
|
|
handle_scsi_tape(parent, &path);
|
|
} else if (streq(subsys, "scsi")) {
|
|
parent = handle_scsi(parent, &path, &supported_parent);
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "cciss")) {
|
|
parent = handle_cciss(parent, &path);
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "usb")) {
|
|
parent = handle_usb(parent, &path);
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "bcma")) {
|
|
parent = handle_bcma(parent, &path);
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "serio")) {
|
|
path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
|
|
parent = skip_subsystem(parent, "serio");
|
|
} else if (streq(subsys, "pci")) {
|
|
path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "pci");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "platform")) {
|
|
path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "platform");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "acpi")) {
|
|
path_prepend(&path, "acpi-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "acpi");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "xen")) {
|
|
path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "xen");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "virtio")) {
|
|
parent = skip_subsystem(parent, "virtio");
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "scm")) {
|
|
path_prepend(&path, "scm-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "scm");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ccw")) {
|
|
path_prepend(&path, "ccw-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "ccw");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ccwgroup")) {
|
|
path_prepend(&path, "ccwgroup-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "ccwgroup");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ap")) {
|
|
parent = handle_ap(parent, &path);
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "iucv")) {
|
|
path_prepend(&path, "iucv-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "iucv");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "nvme")) {
|
|
const char *nsid = udev_device_get_sysattr_value(dev, "nsid");
|
|
|
|
if (nsid) {
|
|
path_prepend(&path, "nvme-%s", nsid);
|
|
parent = skip_subsystem(parent, "nvme");
|
|
supported_parent = true;
|
|
supported_transport = true;
|
|
}
|
|
}
|
|
|
|
if (parent)
|
|
parent = udev_device_get_parent(parent);
|
|
}
|
|
|
|
if (!path)
|
|
return EXIT_FAILURE;
|
|
|
|
/*
|
|
* Do not return devices with an unknown parent device type. They
|
|
* might produce conflicting IDs if the parent does not provide a
|
|
* unique and predictable name.
|
|
*/
|
|
if (!supported_parent)
|
|
return EXIT_FAILURE;
|
|
|
|
/*
|
|
* Do not return block devices without a well-known transport. Some
|
|
* devices do not expose their buses and do not provide a unique
|
|
* and predictable name that way.
|
|
*/
|
|
if (streq_ptr(udev_device_get_subsystem(dev), "block") && !supported_transport)
|
|
return EXIT_FAILURE;
|
|
|
|
{
|
|
char tag[UTIL_NAME_SIZE];
|
|
size_t i;
|
|
const char *p;
|
|
|
|
/* compose valid udev tag name */
|
|
for (p = path, i = 0; *p; p++) {
|
|
if ((*p >= '0' && *p <= '9') ||
|
|
(*p >= 'A' && *p <= 'Z') ||
|
|
(*p >= 'a' && *p <= 'z') ||
|
|
*p == '-') {
|
|
tag[i++] = *p;
|
|
continue;
|
|
}
|
|
|
|
/* skip all leading '_' */
|
|
if (i == 0)
|
|
continue;
|
|
|
|
/* avoid second '_' */
|
|
if (tag[i-1] == '_')
|
|
continue;
|
|
|
|
tag[i++] = '_';
|
|
}
|
|
/* strip trailing '_' */
|
|
while (i > 0 && tag[i-1] == '_')
|
|
i--;
|
|
tag[i] = '\0';
|
|
|
|
udev_builtin_add_property(dev, test, "ID_PATH", path);
|
|
udev_builtin_add_property(dev, test, "ID_PATH_TAG", tag);
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
const struct udev_builtin udev_builtin_path_id = {
|
|
.name = "path_id",
|
|
.cmd = builtin_path_id,
|
|
.help = "Compose persistent device path",
|
|
.run_once = true,
|
|
};
|