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Systemd/namedev.c

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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.
*
*/
/* define this to enable parsing debugging */
/* #define DEBUG_PARSER */
#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"
#define TYPE_LABEL "LABEL"
#define TYPE_NUMBER "NUMBER"
#define TYPE_TOPOLOGY "TOPOLOGY"
#define TYPE_REPLACE "REPLACE"
#define TYPE_CALLOUT "CALLOUT"
static LIST_HEAD(config_device_list);
static void dump_dev(struct config_device *dev)
{
switch (dev->type) {
case KERNEL_NAME:
dbg_parse("KERNEL name ='%s'"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
case LABEL:
dbg_parse("LABEL name = '%s', bus = '%s', sysfs_file = '%s', sysfs_value = '%s'"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name, dev->bus, dev->sysfs_file, dev->sysfs_value,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
case NUMBER:
dbg_parse("NUMBER name = '%s', bus = '%s', id = '%s'"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name, dev->bus, dev->id,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
case TOPOLOGY:
dbg_parse("TOPOLOGY name = '%s', bus = '%s', place = '%s'"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name, dev->bus, dev->place,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
case REPLACE:
dbg_parse("REPLACE name = %s, kernel_name = %s"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name, dev->kernel_name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
case CALLOUT:
dbg_parse("CALLOUT name = '%s', program ='%s', bus = '%s', id = '%s'"
" owner = '%s', group = '%s', mode = '%#o'",
dev->attr.name, dev->exec_program, dev->bus, dev->id,
dev->attr.owner, dev->attr.group, dev->attr.mode);
break;
default:
dbg_parse("Unknown type of device!");
}
}
#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);
static int add_dev(struct config_device *new_dev)
{
struct list_head *tmp;
struct config_device *tmp_dev;
/* loop through the whole list of devices to see if we already have
* this one... */
list_for_each(tmp, &config_device_list) {
struct config_device *dev = list_entry(tmp, struct config_device, node);
if (strcmp(dev->attr.name, new_dev->attr.name) == 0) {
/* the same, copy the new info into this structure */
copy_var(dev, new_dev, type);
copy_var(dev, new_dev, attr.mode);
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, attr.owner);
copy_string(dev, new_dev, attr.group);
return 0;
}
}
/* not found, lets create a new structure, and add it to the list */
tmp_dev = malloc(sizeof(*tmp_dev));
if (!tmp_dev)
return -ENOMEM;
memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
list_add(&tmp_dev->node, &config_device_list);
//dump_dev(tmp_dev);
return 0;
}
static void dump_dev_list(void)
{
struct list_head *tmp;
list_for_each(tmp, &config_device_list) {
struct config_device *dev = list_entry(tmp, struct config_device, node);
dump_dev(dev);
}
}
static int get_value(const char *left, char **orig_string, char **ret_string)
{
char *temp;
char *string = *orig_string;
/* eat any whitespace */
while (isspace(*string))
++string;
/* split based on '=' */
temp = strsep(&string, "=");
if (strcasecmp(temp, left) == 0) {
/* got it, now strip off the '"' */
while (isspace(*string))
++string;
if (*string == '"')
++string;
temp = strsep(&string, "\"");
*ret_string = temp;
*orig_string = string;
return 0;
}
return -ENODEV;
}
static int get_pair(char **orig_string, char **left, char **right)
{
char *temp;
char *string = *orig_string;
/* eat any whitespace */
while (isspace(*string))
++string;
/* split based on '=' */
temp = strsep(&string, "=");
*left = temp;
/* take the right side and strip off the '"' */
while (isspace(*string))
++string;
if (*string == '"')
++string;
temp = strsep(&string, "\"");
*right = temp;
*orig_string = string;
return 0;
}
static int namedev_init_config(void)
{
char filename[255];
char line[255];
char *temp;
char *temp2;
char *temp3;
FILE *fd;
int retval = 0;
struct config_device dev;
strcpy(filename, UDEV_CONFIG_DIR NAMEDEV_CONFIG_FILE);
dbg("opening %s to read as permissions config", filename);
fd = fopen(filename, "r");
if (fd == NULL) {
dbg("Can't open %s", filename);
return -ENODEV;
}
/* loop through the whole file */
while (1) {
/* get a line */
temp = fgets(line, sizeof(line), fd);
if (temp == NULL)
break;
dbg_parse("read %s", temp);
/* eat the whitespace at the beginning of the line */
while (isspace(*temp))
++temp;
/* no more line? */
if (*temp == 0x00)
continue;
/* see if this is a comment */
if (*temp == COMMENT_CHARACTER)
continue;
memset(&dev, 0x00, sizeof(struct config_device));
/* parse the line */
temp2 = strsep(&temp, ",");
if (strcasecmp(temp2, TYPE_LABEL) == 0) {
/* label type */
dev.type = LABEL;
/* BUS="bus" */
retval = get_value("BUS", &temp, &temp3);
if (retval)
continue;
strcpy(dev.bus, temp3);
/* file="value" */
temp2 = strsep(&temp, ",");
retval = get_pair(&temp, &temp2, &temp3);
if (retval)
continue;
strcpy(dev.sysfs_file, temp2);
strcpy(dev.sysfs_value, temp3);
/* NAME="new_name" */
temp2 = strsep(&temp, ",");
retval = get_value("NAME", &temp, &temp3);
if (retval)
continue;
strcpy(dev.attr.name, temp3);
dbg_parse("LABEL name = '%s', bus = '%s', "
"sysfs_file = '%s', sysfs_value = '%s'",
dev.attr.name, dev.bus, dev.sysfs_file,
dev.sysfs_value);
}
if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
/* number type */
dev.type = NUMBER;
/* BUS="bus" */
retval = get_value("BUS", &temp, &temp3);
if (retval)
continue;
strcpy(dev.bus, temp3);
/* ID="id" */
temp2 = strsep(&temp, ",");
retval = get_value("id", &temp, &temp3);
if (retval)
continue;
strcpy(dev.id, temp3);
/* NAME="new_name" */
temp2 = strsep(&temp, ",");
retval = get_value("NAME", &temp, &temp3);
if (retval)
continue;
strcpy(dev.attr.name, temp3);
dbg_parse("NUMBER name = '%s', bus = '%s', id = '%s'",
dev.attr.name, dev.bus, dev.id);
}
if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
/* number type */
dev.type = TOPOLOGY;
/* BUS="bus" */
retval = get_value("BUS", &temp, &temp3);
if (retval)
continue;
strcpy(dev.bus, temp3);
/* PLACE="place" */
temp2 = strsep(&temp, ",");
retval = get_value("place", &temp, &temp3);
if (retval)
continue;
strcpy(dev.place, temp3);
/* NAME="new_name" */
temp2 = strsep(&temp, ",");
retval = get_value("NAME", &temp, &temp3);
if (retval)
continue;
strcpy(dev.attr.name, temp3);
dbg_parse("TOPOLOGY name = '%s', bus = '%s', place = '%s'",
dev.attr.name, dev.bus, dev.place);
}
if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
/* number type */
dev.type = REPLACE;
/* KERNEL="kernel_name" */
retval = get_value("KERNEL", &temp, &temp3);
if (retval)
continue;
strcpy(dev.kernel_name, temp3);
/* NAME="new_name" */
temp2 = strsep(&temp, ",");
retval = get_value("NAME", &temp, &temp3);
if (retval)
continue;
strcpy(dev.attr.name, temp3);
dbg_parse("REPLACE name = %s, kernel_name = %s",
dev.attr.name, dev.kernel_name);
}
if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
/* number type */
dev.type = CALLOUT;
/* PROGRAM="executable" */
retval = get_value("PROGRAM", &temp, &temp3);
if (retval)
continue;
strcpy(dev.exec_program, temp3);
/* BUS="bus" */
temp2 = strsep(&temp, ",");
retval = get_value("BUS", &temp, &temp3);
if (retval)
continue;
strcpy(dev.bus, temp3);
/* ID="id" */
temp2 = strsep(&temp, ",");
retval = get_value("ID", &temp, &temp3);
if (retval)
continue;
strcpy(dev.id, temp3);
/* NAME="new_name" */
temp2 = strsep(&temp, ",");
retval = get_value("NAME", &temp, &temp3);
if (retval)
continue;
strcpy(dev.attr.name, temp3);
dbg_parse("CALLOUT name = %s, program = %s",
dev.attr.name, dev.exec_program);
}
retval = add_dev(&dev);
if (retval) {
dbg("add_dev returned with error %d", retval);
goto exit;
}
}
exit:
fclose(fd);
return retval;
}
static int namedev_init_permissions(void)
{
char filename[255];
char line[255];
char *temp;
char *temp2;
FILE *fd;
int retval = 0;
struct config_device dev;
strcpy(filename, UDEV_CONFIG_DIR NAMEDEV_CONFIG_PERMISSION_FILE);
dbg("opening %s to read as permissions config", filename);
fd = fopen(filename, "r");
if (fd == NULL) {
dbg("Can't open %s", filename);
return -ENODEV;
}
/* loop through the whole file */
while (1) {
/* get a line */
temp = fgets(line, sizeof(line), fd);
if (temp == NULL)
break;
dbg_parse("read %s", temp);
/* eat the whitespace at the beginning of the line */
while (isspace(*temp))
++temp;
/* no more line? */
if (*temp == 0x00)
continue;
/* see if this is a comment */
if (*temp == COMMENT_CHARACTER)
continue;
memset(&dev, 0x00, sizeof(dev));
/* parse the line */
temp2 = strsep(&temp, ":");
strncpy(dev.attr.name, temp2, sizeof(dev.attr.name));
temp2 = strsep(&temp, ":");
strncpy(dev.attr.owner, temp2, sizeof(dev.attr.owner));
temp2 = strsep(&temp, ":");
strncpy(dev.attr.group, temp2, sizeof(dev.attr.owner));
dev.attr.mode = strtol(temp, NULL, 8);
dbg_parse("name = %s, owner = %s, group = %s, mode = %#o",
dev.attr.name, dev.attr.owner, dev.attr.group,
dev.attr.mode);
retval = add_dev(&dev);
if (retval) {
dbg("add_dev returned with error %d", retval);
goto exit;
}
}
exit:
fclose(fd);
return retval;
}
static mode_t get_default_mode(struct sysfs_class_device *class_dev)
{
/* just default everyone to rw for the world! */
return 0666;
}
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];
dbg("callout to %s\n", 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 */
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\n", len);
retval = -1;
}
if (value_set) {
dbg("callout value already set");
retval = -1;
} else {
value_set = 1;
strncpy(value, buffer, len);
}
}
close(fds[0]);
res = wait(&status);
if (res < 0) {
dbg("wait failed result %d", res);
retval = -1;
}
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
dbg("callout program status 0x%x", status);
retval = -1;
}
}
return retval;
}
static int get_attr(struct sysfs_class_device *class_dev, struct device_attr *attr)
{
struct list_head *tmp;
int retval = 0;
int found;
attr->mode = 0;
if (class_dev->sysdevice) {
dbg_parse("class_dev->sysdevice->directory->path = '%s'", class_dev->sysdevice->directory->path);
dbg_parse("class_dev->sysdevice->bus_id = '%s'", class_dev->sysdevice->bus_id);
} else {
dbg_parse("class_dev->name = '%s'", class_dev->name);
}
list_for_each(tmp, &config_device_list) {
struct config_device *dev = list_entry(tmp, struct config_device, node);
switch (dev->type) {
case LABEL:
{
char *temp;
dbg_parse("LABEL: match file '%s' with value '%s'",
dev->sysfs_file, dev->sysfs_value);
/* try to find the attribute in the class device directory */
temp = sysfs_get_value_from_attributes(class_dev->directory->attributes, dev->sysfs_file);
if (temp)
goto label_found;
/* look in the class device device directory if present */
if (class_dev->sysdevice) {
temp = sysfs_get_value_from_attributes(class_dev->sysdevice->directory->attributes, dev->sysfs_file);
if (temp)
goto label_found;
}
/* 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 (strstr(class_dev->directory->path, "block")) {
dbg_parse("looking at block device...");
if (isdigit(class_dev->directory->path[strlen(class_dev->directory->path)-1])) {
char path[SYSFS_PATH_MAX];
struct sysfs_class_device *class_dev_parent;
dbg_parse("really is a partition...");
strcpy(path, class_dev->directory->path);
temp = strrchr(path, '/');
*temp = 0x00;
dbg_parse("looking for a class device at '%s'", path);
class_dev_parent = sysfs_open_class_device(path);
if (class_dev_parent == NULL) {
dbg("sysfs_open_class_device at '%s' failed", path);
continue;
}
dbg_parse("class_dev_parent->name = %s", class_dev_parent->name);
/* try to find the attribute in the class device directory */
temp = sysfs_get_value_from_attributes(class_dev_parent->directory->attributes, dev->sysfs_file);
if (temp) {
//sysfs_close_class_device(class_dev_parent);
goto label_found;
}
/* look in the class device device directory if present */
if (class_dev_parent->sysdevice) {
temp = sysfs_get_value_from_attributes(class_dev_parent->sysdevice->directory->attributes, dev->sysfs_file);
if (temp) {
// sysfs_close_class_device(class_dev_parent);
goto label_found;
}
}
}
}
continue;
label_found:
temp[strlen(temp)-1] = 0x00;
dbg_parse("file '%s' found with value '%s' compare with '%s'", dev->sysfs_file, temp, dev->sysfs_value);
if (strcmp(dev->sysfs_value, temp) != 0)
continue;
strcpy(attr->name, dev->attr.name);
if (isdigit(class_dev->directory->path[strlen(class_dev->directory->path)-1])) {
temp[0] = class_dev->directory->path[strlen(class_dev->directory->path)-1];
temp[1] = 0x00;
strcat(attr->name, temp);
}
if (dev->attr.mode != 0) {
attr->mode = dev->attr.mode;
strcpy(attr->owner, dev->attr.owner);
strcpy(attr->group, dev->attr.group);
}
dbg_parse("file '%s' with value '%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
dev->sysfs_file, dev->sysfs_value, attr->name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
goto done;
break;
}
case NUMBER:
{
char path[SYSFS_PATH_MAX];
char *temp;
found = 0;
if (!class_dev->sysdevice)
continue;
strcpy(path, class_dev->sysdevice->directory->path);
temp = strrchr(path, '/');
dbg_parse("NUMBER path = '%s'", path);
dbg_parse("NUMBER temp = '%s' id = '%s'", temp, dev->id);
if (strstr(temp, dev->id) != NULL) {
found = 1;
} else {
*temp = 0x00;
temp = strrchr(path, '/');
dbg_parse("NUMBERY temp = '%s' id = '%s'", temp, dev->id);
if (strstr(temp, dev->id) != NULL)
found = 1;
}
if (!found)
continue;
strcpy(attr->name, dev->attr.name);
if (dev->attr.mode != 0) {
attr->mode = dev->attr.mode;
strcpy(attr->owner, dev->attr.owner);
strcpy(attr->group, dev->attr.group);
}
dbg_parse("device id '%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
dev->id, attr->name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
goto done;
break;
}
case TOPOLOGY:
{
char path[SYSFS_PATH_MAX];
char *temp;
if (!class_dev->sysdevice)
continue;
found = 0;
strcpy(path, class_dev->sysdevice->directory->path);
temp = strrchr(path, '/');
dbg_parse("TOPOLOGY path = '%s'", path);
dbg_parse("TOPOLOGY temp = '%s' place = '%s'", temp, dev->place);
if (strstr(temp, dev->place) != NULL) {
found = 1;
} else {
*temp = 0x00;
temp = strrchr(path, '/');
dbg_parse("TOPOLOGY temp = '%s' place = '%s'", temp, dev->place);
if (strstr(temp, dev->place) != NULL)
found = 1;
}
if (!found)
continue;
strcpy(attr->name, dev->attr.name);
if (dev->attr.mode != 0) {
attr->mode = dev->attr.mode;
strcpy(attr->owner, dev->attr.owner);
strcpy(attr->group, dev->attr.group);
}
dbg_parse("device at '%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
dev->place, attr->name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
goto done;
break;
}
case CALLOUT:
{
char value[ID_SIZE];
if (exec_callout(dev, value, sizeof(value)))
continue;
if (strncmp(value, dev->id, sizeof(value)) != 0)
continue;
strcpy(attr->name, dev->attr.name);
if (dev->attr.mode != 0) {
attr->mode = dev->attr.mode;
strcpy(attr->owner, dev->attr.owner);
strcpy(attr->group, dev->attr.group);
}
dbg_parse("device callout '%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
dev->id, attr->name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
goto done;
break;
}
case REPLACE:
if (strcmp(dev->kernel_name, class_dev->name) != 0)
continue;
strcpy(attr->name, dev->attr.name);
if (dev->attr.mode != 0) {
attr->mode = dev->attr.mode;
strcpy(attr->owner, dev->attr.owner);
strcpy(attr->group, dev->attr.group);
}
dbg_parse("'%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
dev->kernel_name, attr->name,
dev->attr.owner, dev->attr.group, dev->attr.mode);
goto done;
break;
case KERNEL_NAME:
break;
default:
dbg_parse("Unknown type of device '%d'", dev->type);
break;
}
}
strcpy(attr->name, class_dev->name);
done:
/* mode was never set above */
if (!attr->mode) {
attr->mode = get_default_mode(class_dev);
attr->owner[0] = 0x00;
attr->group[0] = 0x00;
}
return retval;
}
int namedev_name_device(struct sysfs_class_device *class_dev, struct device_attr *attr)
{
int retval;
retval = get_attr(class_dev, attr);
if (retval)
dbg("get_attr failed");
return retval;
}
int namedev_init(void)
{
int retval;
retval = namedev_init_config();
if (retval)
return retval;
retval = namedev_init_permissions();
if (retval)
return retval;
dump_dev_list();
return retval;
}
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