2 * compose persisistent device path
4 * Copyright (C) 2009 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include <../../udev/lib/libudev.h>
32 #include <../../udev/udev.h>
36 static void log_fn(struct udev *udev, int priority,
37 const char *file, int line, const char *fn,
38 const char *format, va_list args)
41 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
42 vfprintf(stderr, format, args);
44 vsyslog(priority, format, args);
48 static int path_prepend(char **path, const char *fmt, ...)
58 err = vasprintf(&pre, fmt, va);
64 err = asprintf(path, "%s-%s", pre, old);
76 static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys)
78 struct udev_device *parent = dev;
80 while (parent != NULL) {
81 const char *subsystem;
83 subsystem = udev_device_get_subsystem(parent);
84 if (subsystem == NULL || strcmp(subsystem, subsys) != 0)
87 parent = udev_device_get_parent(parent);
92 /* find smallest number of instances of <syspath>/<name><number> */
93 static int base_number(const char *syspath, const char *name)
102 base = strdup(syspath);
106 pos = strrchr(base, '/');
115 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
119 if (dent->d_name[0] == '.')
121 if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
123 if (strncmp(dent->d_name, name, len) != 0)
125 i = strtoul(&dent->d_name[len], &rest, 10);
128 if (number == -1 || i < number)
137 static struct udev_device *handle_fc(struct udev_device *parent, char **path)
139 struct udev *udev = udev_device_get_udev(parent);
140 struct udev_device *targetdev;
141 struct udev_device *fcdev = NULL;
145 targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
146 if (targetdev == NULL)
149 fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
152 port = udev_device_get_sysattr_value(fcdev, "port_name");
158 lun = strtoul(udev_device_get_sysnum(parent), NULL, 10);
159 path_prepend(path, "fc-%s:0x%04x%04x00000000", port, lun & 0xffff, (lun >> 16) & 0xffff);
161 udev_device_unref(fcdev);
165 static struct udev_device *handle_sas(struct udev_device *parent, char **path)
170 static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
172 struct udev *udev = udev_device_get_udev(parent);
173 struct udev_device *transportdev;
174 struct udev_device *sessiondev = NULL;
177 struct udev_device *conndev = NULL;
181 /* find iscsi session */
182 transportdev = parent;
184 transportdev = udev_device_get_parent(transportdev);
185 if (transportdev == NULL)
187 if (strncmp(udev_device_get_sysname(transportdev), "session", 7) == 0)
190 if (transportdev == NULL)
193 /* find iscsi session device */
194 sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
195 if (sessiondev == NULL)
197 target = udev_device_get_sysattr_value(sessiondev, "targetname");
198 if (target == NULL) {
203 if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) {
207 conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
209 if (conndev == NULL) {
213 addr = udev_device_get_sysattr_value(conndev, "persistent_address");
214 port = udev_device_get_sysattr_value(conndev, "persistent_port");
215 if (addr == NULL || port == NULL) {
220 path_prepend(path, "ip-%s:%s-iscsi-%s-lun-%s", addr, port, target, udev_device_get_sysnum(parent));
222 udev_device_unref(sessiondev);
223 udev_device_unref(conndev);
227 static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
229 struct udev_device *hostdev;
230 int host, bus, target, lun;
234 hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
238 name = udev_device_get_sysname(parent);
239 if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
242 /* rebase host offset to get the local relative number */
243 base = base_number(udev_device_get_syspath(hostdev), "host");
248 path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
252 static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **path)
258 devtype = udev_device_get_devtype(parent);
259 if (devtype == NULL || strcmp(devtype, "scsi_device") != 0)
263 id = udev_device_get_sysattr_value(parent, "ieee1394_id");
265 parent = skip_subsystem(parent, "scsi");
266 path_prepend(path, "ieee1394-0x%s", id);
270 /* broken scsi transport devices would need a subsystem */
271 name = udev_device_get_syspath(parent);
274 if (strstr(name, "/rport-") != NULL) {
275 parent = handle_fc(parent, path);
280 if (strstr(name, "/end_device-") != NULL) {
281 parent = handle_sas(parent, path);
286 if (strstr(name, "/session") != NULL) {
287 parent = handle_iscsi(parent, path);
292 parent = handle_scsi(parent, path);
297 static void handle_scsi_tape(struct udev_device *dev, char **suffix)
301 name = udev_device_get_sysname(dev);
302 if (strncmp(name, "nst", 3) == 0 && strchr("lma", name[3]) != NULL)
303 asprintf(suffix, "nst%c", name[3]);
304 else if (strncmp(name, "st", 2) == 0 && strchr("lma", name[2]) != NULL)
305 asprintf(suffix, "st%c", name[2]);
308 static struct udev_device *handle_usb(struct udev_device *parent, char **path)
314 devtype = udev_device_get_devtype(parent);
315 if (devtype == NULL || strcmp(devtype, "usb_interface") != 0)
318 str = udev_device_get_sysname(parent);
319 port = strchr(str, '-');
324 parent = skip_subsystem(parent, "usb");
325 path_prepend(path, "usb-0:%s", port);
329 static struct udev_device *handle_cciss(struct udev_device *parent, char **path)
334 static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)
336 struct udev_device *scsi_dev;
338 scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
339 if (scsi_dev != NULL) {
344 hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id");
345 wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn");
346 lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun");
347 if (hba_id != NULL && lun != NULL && wwpn != NULL) {
348 path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun);
353 path_prepend(path, "ccw-%s", udev_device_get_sysname(parent));
355 parent = skip_subsystem(parent, "ccw");
359 int main(int argc, char **argv)
361 static const struct option options[] = {
362 { "debug", no_argument, NULL, 'd' },
363 { "help", no_argument, NULL, 'h' },
367 struct udev_device *dev;
368 struct udev_device *parent;
369 char syspath[UTIL_PATH_SIZE];
379 logging_init("usb_id");
380 udev_set_log_fn(udev, log_fn);
385 option = getopt_long(argc, argv, "dh", options, NULL);
392 if (udev_get_log_priority(udev) < LOG_INFO)
393 udev_set_log_priority(udev, LOG_INFO);
396 printf("Usage: path_id [--debug] [--help] <devpath>\n"
397 " --debug print debug information\n"
398 " --help print this help text\n\n");
405 devpath = argv[optind];
406 if (devpath == NULL) {
407 fprintf(stderr, "No device specified\n");
412 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
413 dev = udev_device_new_from_syspath(udev, syspath);
415 fprintf(stderr, "unable to access '%s'\n", devpath);
424 parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
425 if (parent != NULL) {
426 handle_ccw(parent, dev, &path);
430 /* walk up the chain of devices and compose path */
432 while (parent != NULL) {
435 subsys = udev_device_get_subsystem(parent);
437 if (subsys == NULL) {
439 } else if (strcmp(subsys, "scsi_tape") == 0) {
440 handle_scsi_tape(parent, &path_suffix);
441 } else if (strcmp(subsys, "scsi") == 0) {
442 parent = handle_scsi_lun(parent, &path);
443 } else if (strcmp(subsys, "cciss") == 0) {
444 handle_cciss(parent, &path);
445 } else if (strcmp(subsys, "usb") == 0) {
446 parent = handle_usb(parent, &path);
447 } else if (strcmp(subsys, "serio") == 0) {
448 path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
449 parent = skip_subsystem(parent, "serio");
450 } else if (strcmp(subsys, "pci") == 0) {
451 path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
452 parent = skip_subsystem(parent, "pci");
453 } else if (strcmp(subsys, "platform") == 0) {
454 path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
455 parent = skip_subsystem(parent, "platform");
456 } else if (strcmp(subsys, "xen") == 0) {
457 path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
458 parent = skip_subsystem(parent, "xen");
461 parent = udev_device_get_parent(parent);
465 if (path_suffix != NULL) {
466 printf("ID_PATH=%s%s\n", path, path_suffix);
469 printf("ID_PATH=%s\n", path);
475 udev_device_unref(dev);