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systemd-stable/namedev.c
dsteklof@us.ibm.com 5d4754f195 [PATCH] pre-libsysfs-0.4.0 patch 
I am sending you a pre-release patch. It's everything that's in our
current CVS tree. It adds the functionality you've been looking for. Please
play with this before checking it into your tree, I'd like to know if
it's ok with you or if you find problems. I have tested this out with
test.all and the perl regression test. Let me know what you think.

Still need to do more testing for our work and add some more functions
related to the changes.

I've gone into namedev.c and udev-add.c to make the necessary changes
in line with the library. I have not gone and edited any of the "extras".


Changes:

1) Libsysfs object structures work more as handles now, their included
directories or devices are labeled private. If you need attributes
from a sysfs_class_device, call the available function and don't access
the directory directly. Same holds true for a sysfs_class_device
sysfs_device. Do not access the link directly but call the function
sysfs_get_classdev_device() instead. We only populate entries upon
request, makes things faster and uses less memory.

2) Added sysfs_get_classdev_parent() as requested.

3) Changed getpagesize to sysconf.

4) Added sysfs_refresh_attributes function for refreshing views of
attribute lists. We still need to add refresh for links and subdirs. All
udev needs to do is keep calling sysfs_get_classdev_attr() and that will
internally call the refresh routine.
2005-04-26 21:13:07 -07:00

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/*
* namedev.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* 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 General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include "list.h"
#include "udev.h"
#include "udev_version.h"
#include "namedev.h"
#include "libsysfs/libsysfs.h"
#include "klibc_fixups.h"
LIST_HEAD(config_device_list);
LIST_HEAD(perm_device_list);
/* compare string with pattern (supports * ? [0-9] [!A-Z]) */
static int strcmp_pattern(const char *p, const char *s)
{
if (*s == '\0') {
while (*p == '*')
p++;
return (*p != '\0');
}
switch (*p) {
case '[':
{
int not = 0;
p++;
if (*p == '!') {
not = 1;
p++;
}
while (*p && (*p != ']')) {
int match = 0;
if (p[1] == '-') {
if ((*s >= *p) && (*s <= p[2]))
match = 1;
p += 3;
} else {
match = (*p == *s);
p++;
}
if (match ^ not) {
while (*p && (*p != ']'))
p++;
return strcmp_pattern(p+1, s+1);
}
}
}
break;
case '*':
if (strcmp_pattern(p, s+1))
return strcmp_pattern(p+1, s);
return 0;
case '\0':
if (*s == '\0') {
return 0;
}
break;
default:
if ((*p == *s) || (*p == '?'))
return strcmp_pattern(p+1, s+1);
break;
}
return 1;
}
#define copy_var(a, b, var) \
if (b->var) \
a->var = b->var;
#define copy_string(a, b, var) \
if (strlen(b->var)) \
strcpy(a->var, b->var);
int add_config_dev(struct config_device *new_dev)
{
struct list_head *tmp;
struct config_device *tmp_dev;
/* update the values if we already have the device */
list_for_each(tmp, &config_device_list) {
struct config_device *dev = list_entry(tmp, struct config_device, node);
if (strcmp_pattern(new_dev->name, dev->name))
continue;
if (strncmp(dev->bus, new_dev->bus, sizeof(dev->name)))
continue;
copy_var(dev, new_dev, type);
copy_string(dev, new_dev, bus);
copy_string(dev, new_dev, sysfs_file);
copy_string(dev, new_dev, sysfs_value);
copy_string(dev, new_dev, id);
copy_string(dev, new_dev, place);
copy_string(dev, new_dev, kernel_name);
copy_string(dev, new_dev, exec_program);
copy_string(dev, new_dev, symlink);
return 0;
}
/* not found, add new structure to the device list */
tmp_dev = malloc(sizeof(*tmp_dev));
if (!tmp_dev)
return -ENOMEM;
memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
list_add_tail(&tmp_dev->node, &config_device_list);
//dump_config_dev(tmp_dev);
return 0;
}
int add_perm_dev(struct perm_device *new_dev)
{
struct list_head *tmp;
struct perm_device *tmp_dev;
/* update the values if we already have the device */
list_for_each(tmp, &perm_device_list) {
struct perm_device *dev = list_entry(tmp, struct perm_device, node);
if (strcmp_pattern(new_dev->name, dev->name))
continue;
copy_var(dev, new_dev, mode);
copy_string(dev, new_dev, owner);
copy_string(dev, new_dev, group);
return 0;
}
/* not found, add new structure to the perm list */
tmp_dev = malloc(sizeof(*tmp_dev));
if (!tmp_dev)
return -ENOMEM;
memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
list_add_tail(&tmp_dev->node, &perm_device_list);
//dump_perm_dev(tmp_dev);
return 0;
}
static struct perm_device *find_perm(char *name)
{
struct list_head *tmp;
struct perm_device *perm = NULL;
list_for_each(tmp, &perm_device_list) {
perm = list_entry(tmp, struct perm_device, node);
if (strcmp_pattern(perm->name, name))
continue;
return perm;
}
return NULL;
}
static mode_t get_default_mode(struct sysfs_class_device *class_dev)
{
mode_t mode = 0600; /* default to owner rw only */
if (strlen(default_mode_str) != 0) {
mode = strtol(default_mode_str, NULL, 8);
}
return mode;
}
static void build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
{
char *dig;
/* FIXME, figure out how to handle stuff like sdaj which will not work right now. */
dig = class_dev->name + strlen(class_dev->name);
while (isdigit(*(dig-1)))
dig--;
strfieldcpy(udev->kernel_number, dig);
dbg("kernel_number='%s'", udev->kernel_number);
}
static void apply_format(struct udevice *udev, unsigned char *string)
{
char name[NAME_SIZE];
char *pos;
while (1) {
pos = strchr(string, '%');
if (pos) {
strfieldcpy(name, pos+2);
*pos = 0x00;
switch (pos[1]) {
case 'b':
if (strlen(udev->bus_id) == 0)
break;
strcat(pos, udev->bus_id);
dbg("substitute bus_id '%s'", udev->bus_id);
break;
case 'n':
if (strlen(udev->kernel_number) == 0)
break;
strcat(pos, udev->kernel_number);
dbg("substitute kernel number '%s'", udev->kernel_number);
break;
case 'D':
if (strlen(udev->kernel_number) == 0) {
strcat(pos, "disc");
break;
}
strcat(pos, "part");
strcat(pos, udev->kernel_number);
dbg("substitute kernel number '%s'", udev->kernel_number);
break;
case 'm':
sprintf(pos, "%u", udev->minor);
dbg("substitute minor number '%u'", udev->minor);
break;
case 'M':
sprintf(pos, "%u", udev->major);
dbg("substitute major number '%u'", udev->major);
break;
case 'c':
if (strlen(udev->callout_value) == 0)
break;
strcat(pos, udev->callout_value);
dbg("substitute callout output '%s'", udev->callout_value);
break;
default:
dbg("unknown substitution type '%%%c'", pos[1]);
break;
}
strcat(string, name);
} else
break;
}
}
static int exec_callout(struct config_device *dev, char *value, int len)
{
int retval;
int res;
int status;
int fds[2];
pid_t pid;
int value_set = 0;
char buffer[256];
char *arg;
char *args[CALLOUT_MAXARG];
int i;
dbg("callout to '%s'", dev->exec_program);
retval = pipe(fds);
if (retval != 0) {
dbg("pipe failed");
return -1;
}
pid = fork();
if (pid == -1) {
dbg("fork failed");
return -1;
}
if (pid == 0) {
/* child */
close(STDOUT_FILENO);
dup(fds[1]); /* dup write side of pipe to STDOUT */
if (strchr(dev->exec_program, ' ')) {
/* callout with arguments */
arg = dev->exec_program;
for (i=0; i < CALLOUT_MAXARG-1; i++) {
args[i] = strsep(&arg, " ");
if (args[i] == NULL)
break;
}
if (args[i]) {
dbg("too many args - %d", i);
args[i] = NULL;
}
retval = execve(args[0], args, main_envp);
} else {
retval = execve(dev->exec_program, main_argv, main_envp);
}
if (retval != 0) {
dbg("child execve failed");
exit(1);
}
return -1; /* avoid compiler warning */
} else {
/* parent reads from fds[0] */
close(fds[1]);
retval = 0;
while (1) {
res = read(fds[0], buffer, sizeof(buffer) - 1);
if (res <= 0)
break;
buffer[res] = '\0';
if (res > len) {
dbg("callout len %d too short", len);
retval = -1;
}
if (value_set) {
dbg("callout value already set");
retval = -1;
} else {
value_set = 1;
strncpy(value, buffer, len);
}
}
dbg("callout returned '%s'", value);
close(fds[0]);
res = wait(&status);
if (res < 0) {
dbg("wait failed result %d", res);
retval = -1;
}
#ifndef __KLIBC__
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
dbg("callout program status 0x%x", status);
retval = -1;
}
#endif
}
return retval;
}
static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
{
struct config_device *dev;
struct list_head *tmp;
list_for_each(tmp, &config_device_list) {
dev = list_entry(tmp, struct config_device, node);
if (dev->type != CALLOUT)
continue;
if (sysfs_device) {
dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
continue;
}
/* substitute anything that needs to be in the program name */
apply_format(udev, dev->exec_program);
if (exec_callout(dev, udev->callout_value, NAME_SIZE))
continue;
if (strcmp_pattern(dev->id, udev->callout_value) != 0)
continue;
strfieldcpy(udev->name, dev->name);
strfieldcpy(udev->symlink, dev->symlink);
dbg("callout returned matching value '%s', '%s' becomes '%s'",
dev->id, class_dev->name, udev->name);
return 0;
}
return -ENODEV;
}
static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
{
struct sysfs_attribute *tmpattr = NULL;
struct config_device *dev;
struct list_head *tmp;
char *c;
list_for_each(tmp, &config_device_list) {
dev = list_entry(tmp, struct config_device, node);
if (dev->type != LABEL)
continue;
if (sysfs_device) {
dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
continue;
}
dbg("look for device attribute '%s'", dev->sysfs_file);
/* try to find the attribute in the class device directory */
tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
if (tmpattr)
goto label_found;
/* look in the class device directory if present */
if (sysfs_device) {
tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
if (tmpattr)
goto label_found;
}
continue;
label_found:
c = tmpattr->value + strlen(tmpattr->value)-1;
if (*c == '\n')
*c = 0x00;
dbg("compare attribute '%s' value '%s' with '%s'",
dev->sysfs_file, tmpattr->value, dev->sysfs_value);
if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
continue;
strfieldcpy(udev->name, dev->name);
strfieldcpy(udev->symlink, dev->symlink);
dbg("found matching attribute '%s', '%s' becomes '%s' ",
dev->sysfs_file, class_dev->name, udev->name);
return 0;
}
return -ENODEV;
}
static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
{
struct config_device *dev;
struct list_head *tmp;
char path[SYSFS_PATH_MAX];
int found;
char *temp = NULL;
/* we have to have a sysfs device for NUMBER to work */
if (!sysfs_device)
return -ENODEV;
list_for_each(tmp, &config_device_list) {
dev = list_entry(tmp, struct config_device, node);
if (dev->type != NUMBER)
continue;
dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
continue;
found = 0;
strfieldcpy(path, sysfs_device->path);
temp = strrchr(path, '/');
dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
if (strstr(temp, dev->id) != NULL) {
found = 1;
} else {
*temp = 0x00;
temp = strrchr(path, '/');
dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
if (strstr(temp, dev->id) != NULL)
found = 1;
}
if (!found)
continue;
strfieldcpy(udev->name, dev->name);
strfieldcpy(udev->symlink, dev->symlink);
dbg("found matching id '%s', '%s' becomes '%s'",
dev->id, class_dev->name, udev->name);
return 0;
}
return -ENODEV;
}
static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
{
struct config_device *dev;
struct list_head *tmp;
char path[SYSFS_PATH_MAX];
int found;
char *temp = NULL;
/* we have to have a sysfs device for TOPOLOGY to work */
if (!sysfs_device)
return -ENODEV;
list_for_each(tmp, &config_device_list) {
dev = list_entry(tmp, struct config_device, node);
if (dev->type != TOPOLOGY)
continue;
dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
continue;
found = 0;
strfieldcpy(path, sysfs_device->path);
temp = strrchr(path, '/');
dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
if (strstr(temp, dev->place) != NULL) {
found = 1;
} else {
*temp = 0x00;
temp = strrchr(path, '/');
dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
if (strstr(temp, dev->place) != NULL)
found = 1;
}
if (!found)
continue;
strfieldcpy(udev->name, dev->name);
strfieldcpy(udev->symlink, dev->symlink);
dbg("found matching place '%s', '%s' becomes '%s'",
dev->place, class_dev->name, udev->name);
return 0;
}
return -ENODEV;
}
static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
{
struct config_device *dev;
struct list_head *tmp;
list_for_each(tmp, &config_device_list) {
dev = list_entry(tmp, struct config_device, node);
if (dev->type != REPLACE)
continue;
dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
continue;
strfieldcpy(udev->name, dev->name);
strfieldcpy(udev->symlink, dev->symlink);
dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
return 0;
}
return -ENODEV;
}
static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
{
/* heh, this is pretty simple... */
strfieldcpy(udev->name, class_dev->name);
}
int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
{
struct sysfs_device *sysfs_device = NULL;
struct sysfs_class_device *class_dev_parent = NULL;
int retval = 0;
struct perm_device *perm;
udev->mode = 0;
/* find the sysfs_device for this class device */
/* Wouldn't it really be nice if libsysfs could do this for us? */
sysfs_device = sysfs_get_classdev_device(class_dev);
if (sysfs_device == NULL) {
/* bah, let's go backwards up a level to see if the device is there,
* as block partitions don't point to the physical device. Need to fix that
* up in the kernel...
*/
if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
dbg("looking at block device");
if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
dbg("really is a partition");
class_dev_parent = sysfs_get_classdev_parent
(class_dev);
if (class_dev_parent == NULL) {
dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
} else {
dbg("class_dev_parent->name='%s'", class_dev_parent->name);
sysfs_device = sysfs_get_classdev_device(class_dev_parent);
}
}
}
}
if (sysfs_device) {
dbg("sysfs_device->path='%s'", sysfs_device->path);
dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
dbg("sysfs_device->bus='%s'", sysfs_device->bus);
strfieldcpy(udev->bus_id, sysfs_device->bus_id);
} else {
dbg("class_dev->name = '%s'", class_dev->name);
}
build_kernel_number(class_dev, udev);
/* rules are looked at in priority order */
retval = do_callout(class_dev, udev, sysfs_device);
if (retval == 0)
goto found;
retval = do_label(class_dev, udev, sysfs_device);
if (retval == 0)
goto found;
retval = do_number(class_dev, udev, sysfs_device);
if (retval == 0)
goto found;
retval = do_topology(class_dev, udev, sysfs_device);
if (retval == 0)
goto found;
retval = do_replace(class_dev, udev, sysfs_device);
if (retval == 0)
goto found;
do_kernelname(class_dev, udev);
goto done;
found:
/* substitute placeholder */
apply_format(udev, udev->name);
apply_format(udev, udev->symlink);
done:
perm = find_perm(udev->name);
if (perm) {
udev->mode = perm->mode;
strfieldcpy(udev->owner, perm->owner);
strfieldcpy(udev->group, perm->group);
} else {
/* no matching perms found :( */
udev->mode = get_default_mode(class_dev);
udev->owner[0] = 0x00;
udev->group[0] = 0x00;
}
dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
udev->name, udev->owner, udev->group, udev->mode);
return 0;
}
int namedev_init(void)
{
int retval;
retval = namedev_init_rules();
if (retval)
return retval;
retval = namedev_init_permissions();
if (retval)
return retval;
dump_config_dev_list();
dump_perm_dev_list();
return retval;
}
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