diff options
Diffstat (limited to 'udevinfo.c')
| -rw-r--r-- | udevinfo.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/udevinfo.c b/udevinfo.c new file mode 100644 index 0000000000..a2f5601b7c --- /dev/null +++ b/udevinfo.c @@ -0,0 +1,424 @@ +/* + * udevinfo - fetches attributes for a device + * + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * + * + * 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 <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <ctype.h> +#include <stdarg.h> +#include <unistd.h> +#include <errno.h> + +#include "udev.h" +#include "udev_version.h" +#include "logging.h" +#include "udevdb.h" +#include "libsysfs/libsysfs.h" + + +# define SYSFS_VALUE_MAX 200 + +char **main_argv; +int main_argc; +char **main_envp; + +static int print_all_attributes(const char *path) +{ + struct dlist *attributes; + struct sysfs_attribute *attr; + struct sysfs_directory *sysfs_dir; + char value[SYSFS_VALUE_MAX]; + int len; + int retval = 0; + + sysfs_dir = sysfs_open_directory(path); + if (sysfs_dir == NULL) + return -1; + + attributes = sysfs_get_dir_attributes(sysfs_dir); + if (attributes == NULL) { + retval = -1; + goto exit; + } + + dlist_for_each_data(attributes, attr, struct sysfs_attribute) { + if (attr->value != NULL) { + strncpy(value, attr->value, SYSFS_VALUE_MAX); + len = strlen(value); + if (len == 0) + continue; + + /* remove trailing newline */ + if (value[len-1] == '\n') { + value[len-1] = '\0'; + len--; + } + + /* skip nonprintable values */ + while (len) { + if (isprint(value[len-1]) == 0) + break; + len--; + } + if (len == 0) + printf(" SYSFS_%s=\"%s\"\n", attr->name, value); + } + } + printf("\n"); + +exit: + sysfs_close_directory(sysfs_dir); + + return retval; +} + +/* callback for database dump */ +static int print_record(char *path, struct udevice *dev) +{ + printf("P: %s\n", path); + printf("N: %s\n", dev->name); + printf("M: %#o\n", dev->mode); + printf("S: %s\n", dev->symlink); + printf("O: %s\n", dev->owner); + printf("G: %s\n", dev->group); + printf("\n"); + return 0; +} + +enum query_type { + NONE, + NAME, + PATH, + SYMLINK, + MODE, + OWNER, + GROUP +}; + +static int print_device_chain(const char *path) +{ + struct sysfs_class_device *class_dev; + struct sysfs_class_device *class_dev_parent; + struct sysfs_attribute *attr; + struct sysfs_device *sysfs_dev; + struct sysfs_device *sysfs_dev_parent; + int retval = 0; + + /* get the class dev */ + class_dev = sysfs_open_class_device_path(path); + if (class_dev == NULL) { + printf("couldn't get the class device\n"); + return -1; + } + + /* read the 'dev' file for major/minor*/ + attr = sysfs_get_classdev_attr(class_dev, "dev"); + if (attr == NULL) { + printf("couldn't get the \"dev\" file\n"); + retval = -1; + goto exit; + } + printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value); + sysfs_close_attribute(attr); + + /* open sysfs class device directory and print all attributes */ + printf(" looking at class device '%s':\n", class_dev->path); + if (print_all_attributes(class_dev->path) != 0) { + printf("couldn't open class device directory\n"); + retval = -1; + goto exit; + } + + /* get the device link (if parent exists look here) */ + class_dev_parent = sysfs_get_classdev_parent(class_dev); + if (class_dev_parent != NULL) { + //sysfs_close_class_device(class_dev); + class_dev = class_dev_parent; + } + sysfs_dev = sysfs_get_classdev_device(class_dev); + if (sysfs_dev != NULL) + printf("follow the class device's \"device\"\n"); + + /* look the device chain upwards */ + while (sysfs_dev != NULL) { + printf(" looking at the device chain at '%s':\n", sysfs_dev->path); + printf(" BUS=\"%s\"\n", sysfs_dev->bus); + printf(" ID=\"%s\"\n", sysfs_dev->bus_id); + + /* open sysfs device directory and print all attributes */ + print_all_attributes(sysfs_dev->path); + + sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev); + if (sysfs_dev_parent == NULL) + break; + + //sysfs_close_device(sysfs_dev); + sysfs_dev = sysfs_dev_parent; + } + sysfs_close_device(sysfs_dev); + +exit: + //sysfs_close_class_device(class_dev); + return retval; +} + +static int process_options(void) +{ + static const char short_options[] = "adn:p:q:rVh"; + int option; + int retval = 1; + struct udevice dev; + int root = 0; + int attributes = 0; + enum query_type query = NONE; + char result[NAME_SIZE] = ""; + char path[NAME_SIZE] = ""; + char name[NAME_SIZE] = ""; + char temp[NAME_SIZE]; + char *pos; + + /* get command line options */ + while (1) { + option = getopt(main_argc, main_argv, short_options); + if (option == -1) + break; + + dbg("option '%c'", option); + switch (option) { + case 'n': + dbg("udev name: %s\n", optarg); + strfieldcpy(name, optarg); + break; + + case 'p': + dbg("udev path: %s\n", optarg); + strfieldcpy(path, optarg); + break; + + case 'q': + dbg("udev query: %s\n", optarg); + + if (strcmp(optarg, "name") == 0) { + query = NAME; + break; + } + + if (strcmp(optarg, "symlink") == 0) { + query = SYMLINK; + break; + } + + if (strcmp(optarg, "mode") == 0) { + query = MODE; + break; + } + + if (strcmp(optarg, "owner") == 0) { + query = OWNER; + break; + } + + if (strcmp(optarg, "group") == 0) { + query = GROUP; + break; + } + + if (strcmp(optarg, "path") == 0) { + query = PATH; + break; + } + + printf("unknown query type\n"); + exit(1); + + case 'r': + root = 1; + break; + + case 'a': + attributes = 1; + break; + + case 'd': + retval = udevdb_open_ro(); + if (retval != 0) { + printf("unable to open udev database\n"); + exit(2); + } + udevdb_call_foreach(print_record); + udevdb_exit(); + exit(0); + + case 'V': + printf("udevinfo, version %s\n", UDEV_VERSION); + exit(0); + + case 'h': + retval = 0; + case '?': + default: + goto help; + } + } + + /* process options */ + if (query != NONE) { + retval = udevdb_open_ro(); + if (retval != 0) { + printf("unable to open udev database\n"); + return -EACCES; + } + + if (path[0] != '\0') { + /* remove sysfs_path if given */ + if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) { + pos = path + strlen(sysfs_path); + } else { + if (path[0] != '/') { + /* prepend '/' if missing */ + strcat(temp, "/"); + strncat(temp, path, sizeof(path)); + pos = temp; + } else { + pos = path; + } + } + retval = udevdb_get_dev(pos, &dev); + if (retval != 0) { + printf("device not found in database\n"); + goto exit; + } + goto print; + } + + if (name[0] != '\0') { + /* remove udev_root if given */ + if (strncmp(name, udev_root, strlen(udev_root)) == 0) { + pos = name + strlen(udev_root); + } else + pos = name; + retval = udevdb_get_dev_byname(pos, path, &dev); + if (retval != 0) { + printf("device not found in database\n"); + goto exit; + } + goto print; + } + + printf("query needs device path(-p) or node name(-n) specified\n"); + goto exit; + +print: + switch(query) { + case NAME: + if (root) + strfieldcpy(result, udev_root); + strncat(result, dev.name, sizeof(result)); + break; + + case SYMLINK: + strfieldcpy(result, dev.symlink); + break; + + case MODE: + sprintf(result, "%#o", dev.mode); + break; + + case GROUP: + strfieldcpy(result, dev.group); + break; + + case OWNER: + strfieldcpy(result, dev.owner); + break; + + case PATH: + strfieldcpy(result, path); + break; + + default: + goto exit; + } + printf("%s\n", result); + +exit: + udevdb_exit(); + return retval; + } + + if (attributes) { + if (path[0] == '\0') { + printf("attribute walk on device chain needs path(-p) specified\n"); + return -EINVAL; + } else { + if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) { + /* prepend sysfs mountpoint if not given */ + strfieldcpy(temp, path); + strfieldcpy(path, sysfs_path); + strncat(path, temp, sizeof(path)); + } + print_device_chain(path); + return 0; + } + } + + if (root) { + printf("%s\n", udev_root); + return 0; + } + +help: + printf("Usage: [-anpqrdVh]\n" + " -q TYPE query database for the specified value:\n" + " 'name' name of device node\n" + " 'symlink' pointing to node\n" + " 'mode' permissions of node\n" + " 'owner' of node\n" + " 'group' of node\n" + " 'path' sysfs device path\n" + " -p PATH sysfs device path used for query or chain\n" + " -n NAME node name used for query\n" + "\n" + " -r print udev root\n" + " -a print all attributes along the chain of the device\n" + " -d dump whole database\n" + " -V print udev version\n" + " -h print this help text\n" + "\n"); + return retval; +} + +int main(int argc, char *argv[], char *envp[]) +{ + int retval; + + main_argv = argv; + main_argc = argc; + main_envp = envp; + + /* initialize our configuration */ + udev_init_config(); + + retval = process_options(); + if (retval != 0) + exit(1); + exit(0); +} |