summaryrefslogtreecommitdiff
path: root/extras/cdsymlinks.c
diff options
context:
space:
mode:
Diffstat (limited to 'extras/cdsymlinks.c')
-rw-r--r--extras/cdsymlinks.c555
1 files changed, 0 insertions, 555 deletions
diff --git a/extras/cdsymlinks.c b/extras/cdsymlinks.c
deleted file mode 100644
index b6bc96dc6f..0000000000
--- a/extras/cdsymlinks.c
+++ /dev/null
@@ -1,555 +0,0 @@
-/* cdsymlinks.c
- *
- * Map cdrom, cd-r, cdrw, dvd, dvdrw, dvdram to suitable devices.
- * Prefers cd* for DVD-incapable and cdrom and dvd for read-only devices.
- * First parameter is the kernel device name.
- * Second parameter, if present, must be "-d" => output the full mapping.
- *
- * Usage:
- * BUS="ide", KERNEL="hd[a-z]", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
- * BUS="scsi", KERNEL="sr[0-9]*", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
- * BUS="scsi", KERNEL="scd[0-9]*", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
- * (this last one is "just in case")
- *
- * (c) 2004, 2005 Darren Salt <linux@youmustbejoking.demon.co.uk>
- *
- * Contributors:
- * - J A Magallon <jamagallon@able.es> (bug fixes)
- *
- * Last modified: 2005-02-15
- */
-
-#define _GNU_SOURCE
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <errno.h>
-
-#include <strings.h>
-#include <sys/types.h>
-#include <dirent.h>
-
-#include <unistd.h>
-
-#include <wordexp.h>
-
-static const char *progname;
-
-/* This file provides us with our devices and capabilities information. */
-#define CDROM_INFO "/proc/sys/dev/cdrom/info"
-
-/* This file contains our default settings. */
-#define CONFIGURATION "/etc/udev/cdsymlinks.conf"
-/* Default output types configuration, in the presence of an empty list */
-#define OUTPUT_DEFAULT "CD CDRW DVD DVDRW DVDRAM"
-
-static int debug = 0;
-
-/* List item */
-struct list_item_t {
- struct list_item_t *next;
- char *data;
-};
-
-/* List root. Note offset of list_t->head and list_item_t->next */
-struct list_t {
- struct list_item_t *head, *tail;
-};
-
-/* Configuration variables */
-static struct list_t allowed_output = {0};
-static int numbered_links = 1;
-static int link_zero = 0;
-
-/* Available devices */
-static struct list_t Devices = {0};
-
-/* Devices' capabilities in full (same order as available devices list).
- * There's no cap_CD; all are assumed able to read CDs.
- */
-static struct list_t cap_DVDRAM = {0}, cap_DVDRW = {0}, cap_DVD = {0},
- cap_CDRW = {0}, cap_CDR = {0}, cap_CDWMRW = {0},
- cap_CDMRW = {0}, cap_CDRAM = {0};
-
-/* Device capabilities by name */
-static struct list_t dev_DVDRAM = {0}, dev_DVDRW = {0}, dev_DVD = {0},
- dev_CDRW = {0}, dev_CDR = {0}, dev_CDWMRW = {0},
- dev_CDMRW = {0}, dev_CDRAM = {0};
-#define dev_CD Devices
-
-typedef struct {
- struct list_t *cap, *dev;
- const char label[8], symlink[8];
- const char *captext;
- int captextlen;
-} cap_dev_t;
-
-#define CAPDEV(X) &cap_##X, &dev_##X
-
-static const cap_dev_t cap_dev_info[] = {
- { NULL, &dev_CD, "CD", "cdrom", NULL, 0 },
- { CAPDEV(CDR), "CDR", "cd-r", "Can write CD-R:", 15 },
- { CAPDEV(CDRW), "CDRW", "cdrw", "Can write CD-RW:", 16 },
- { CAPDEV(DVD), "DVD", "dvd", "Can read DVD:", 13 },
- { CAPDEV(DVDRW), "DVDRW", "dvdrw", "Can write DVD-R:", 16 },
- { CAPDEV(DVDRAM), "DVDRAM", "dvdram", "Can write DVD-RAM:", 18 },
- { CAPDEV(CDMRW), "CDMRW", "cdm", "Can read MRW:", 13 }, /* CDC-MRW R */
- { CAPDEV(CDWMRW), "CDWMRW", "cdmrw", "Can write MRW:", 14 }, /* CDC-MRW W */
- { CAPDEV(CDRAM), "CDRAM", "cdram", "Can write RAM:", 14 }, /* CDC-RAM W */
- { NULL }
-};
-
-#define foreach_cap_dev(loop) \
- for ((loop) = cap_dev_info; (loop)->label[0]; ++(loop))
-#define foreach_cap_dev_noCD(loop) \
- for ((loop) = cap_dev_info + 1; (loop)->label[0]; ++(loop))
-
-/*
- * Some library-like bits first...
- */
-
-static void
-errexit (const char *reason)
-{
- fprintf (stderr, "%s: %s: %s\n", progname, reason, strerror (errno));
- exit (2);
-}
-
-
-static void
-msgexit (const char *reason)
-{
- fprintf (stderr, "%s: %s\n", progname, reason);
- exit (2);
-}
-
-
-static void
-errwarn (const char *reason)
-{
- fprintf (stderr, "%s: warning: %s: %s\n", progname, reason, strerror (errno));
-}
-
-
-static void
-msgwarn (const char *reason)
-{
- fprintf (stderr, "%s: warning: %s\n", progname, reason);
-}
-
-
-static void *
-xmalloc (size_t size)
-{
- void *mem = malloc (size);
- if (size && !mem)
- msgexit ("malloc failed");
- return mem;
-}
-
-
-static char *
-xstrdup (const char *text)
-{
- char *mem = xmalloc (strlen (text) + 1);
- return strcpy (mem, text);
-}
-
-
-/* Append a string to a list. The string is duplicated. */
-static void
-list_append (struct list_t *list, const char *data)
-{
- struct list_item_t *node = xmalloc (sizeof (struct list_item_t));
- node->next = NULL;
- if (list->tail)
- list->tail->next = node;
- list->tail = node;
- if (!list->head)
- list->head = node;
- node->data = xstrdup (data);
-}
-
-
-/* Prepend a string to a list. The string is duplicated. */
-static void
-list_prepend (struct list_t *list, const char *data)
-{
- struct list_item_t *node = xmalloc (sizeof (struct list_item_t));
- node->next = list->head;
- list->head = node;
- if (!list->tail)
- list->tail = node;
- node->data = xstrdup (data);
-}
-
-
-/* Delete a lists's contents, freeing claimed memory */
-static void
-list_delete (struct list_t *list)
-{
- struct list_item_t *node = list->head;
- while (node)
- {
- struct list_item_t *n = node;
- node = node->next;
- free (n->data);
- free (n);
- }
- list->tail = list->head = NULL;
-}
-
-
-/* Print out a list on one line, each item space-prefixed, no LF */
-static void
-list_print (const struct list_t *list, FILE *stream)
-{
- const struct list_item_t *node = (const struct list_item_t *)list;
- while ((node = node->next) != NULL)
- fprintf (stream, " %s", node->data);
-}
-
-
-/* Return the nth item in a list (count from 0)
- * If there aren't enough items in the list, return the requested default
- */
-static const struct list_item_t *
-list_nth (const struct list_t *list, size_t nth)
-{
- const struct list_item_t *node = list->head;
- while (nth && node)
- {
- node = node->next;
- --nth;
- }
- return node;
-}
-
-
-/* Return the first matching item in a list, or NULL */
-static const struct list_item_t *
-list_search (const struct list_t *list, const char *data)
-{
- const struct list_item_t *node = list->head;
- while (node)
- {
- if (!strcmp (node->data, data))
- return node;
- node = node->next;
- }
- return NULL;
-}
-
-
-/* Split up a string on whitespace & assign the resulting tokens to a list.
- * Ignore everything up until the first colon (if present).
- */
-static void
-list_assign_split (struct list_t *list, char *text)
-{
- char *token = strchr (text, ':');
- token = strtok (token ? token + 1 : text, " \t\n");
- while (token)
- {
- list_prepend (list, token);
- token = strtok (0, " \t\n");
- }
-}
-
-
-
-/* Gather the default settings. */
-static void
-read_defaults (void)
-{
- FILE *conf = fopen (CONFIGURATION, "r");
- if (!conf)
- {
- if (errno != ENOENT)
- errwarn ("error accessing configuration");
- }
- else
- {
- char *text = NULL;
- size_t textlen;
- while (getline (&text, &textlen, conf) != -1)
- {
- wordexp_t p = {0};
- int len = strlen (text);
- if (len && text[len - 1] == '\n')
- text[--len] = '\0';
- if (len && text[len - 1] == '\r')
- text[--len] = '\0';
- if (!len)
- continue;
- char *token = text + strspn (text, " \t");
- if (!*token || *token == '#')
- continue;
- switch (len = wordexp (text, &p, 0))
- {
- case WRDE_NOSPACE:
- msgexit ("malloc failed");
- case 0:
- if (p.we_wordc == 1)
- {
- if (!strncmp (p.we_wordv[0], "OUTPUT=", 7))
- {
- list_delete (&allowed_output);
- list_assign_split (&allowed_output, p.we_wordv[0] + 7);
- }
- else if (!strncmp (p.we_wordv[0], "NUMBERED_LINKS=", 15))
- numbered_links = atoi (p.we_wordv[0] + 15);
- else if (!strncmp (p.we_wordv[0], "LINK_ZERO=", 15))
- link_zero = atoi (p.we_wordv[0] + 15);
- break;
- }
- /* fall through */
- default:
- msgwarn ("syntax error in configuration file");
- }
- wordfree (&p);
- }
- if (!feof (conf))
- errwarn ("error accessing configuration");
- if (fclose (conf))
- errwarn ("error accessing configuration");
- free (text);
- }
- if (!allowed_output.head)
- {
- char *dflt = strdup (OUTPUT_DEFAULT);
- list_assign_split (&allowed_output, dflt);
- free (dflt);
- }
-}
-
-
-/* From information supplied by the kernel:
- * + get the names of the available devices
- * + populate our capability lists
- * Order is significant: device item N maps to each capability item N.
- */
-static void
-populate_capability_lists (void)
-{
- FILE *info = fopen (CDROM_INFO, "r");
- if (!info)
- {
- if (errno == ENOENT)
- exit (0);
- errexit ("error accessing CD/DVD info");
- }
-
- char *text = 0;
- size_t textlen = 0;
-
- while (getline (&text, &textlen, info) != -1)
- {
- if (!strncasecmp (text, "drive name", 10))
- list_assign_split (&Devices, text);
- else
- {
- const cap_dev_t *cap;
- foreach_cap_dev_noCD (cap)
- if (!strncasecmp (text, cap->captext, cap->captextlen))
- {
- list_assign_split (cap->cap, text);
- break;
- }
- }
- }
- if (!feof (info))
- errexit ("error accessing CD/DVD info");
- fclose (info);
- free (text);
-}
-
-
-/* Write out the links of type LINK which should be created for device NAME,
- * taking into account existing links and the capability list for type LINK.
- */
-static void
-do_output (const char *name, const char *link, const struct list_t *dev,
- int do_link_zero)
-{
- const struct list_item_t *i = (const struct list_item_t *)dev;
- if (!i->next)
- return;
-
- errno = 0;
-
- size_t link_len = strlen (link);
- DIR *dir = opendir ("/dev");
- if (!dir)
- errexit ("error reading /dev");
-
- struct list_t devls = {0}; /* symlinks whose name matches LINK */
- struct list_t devlinks = {0}; /* those symlinks' targets */
- struct dirent *entry;
- while ((entry = readdir (dir)) != NULL)
- {
- if (strncmp (entry->d_name, link, link_len))
- continue; /* wrong name: ignore it */
-
- /* The rest of the name must be null or consist entirely of digits. */
- const char *p = entry->d_name + link_len - 1;
- while (*++p)
- if (!isdigit (*p))
- break;
- if (*p)
- continue; /* wrong format - ignore */
-
- /* Assume that it's a symlink and try to read its target. */
- char buf[sizeof (entry->d_name)];
- int r = readlink (entry->d_name, buf, sizeof (buf) - 1);
- if (r < 0)
- {
- if (errno == EINVAL)
- continue; /* not a symlink - ignore */
- errexit ("error reading link in /dev");
- }
- /* We have the name and the target, so update our lists. */
- buf[r] = 0;
- list_append (&devls, entry->d_name);
- list_append (&devlinks, buf);
- }
- if (errno)
- errexit ("error reading /dev");
- if (closedir (dir))
- errexit ("error closing /dev");
-
- /* Now we write our output... */
- size_t count = 0;
- while ((i = i->next) != NULL)
- {
- int isdev = !strcmp (name, i->data); /* current dev == target dev? */
- int present = 0;
- size_t li = -1;
- const struct list_item_t *l = (const struct list_item_t *)&devlinks;
-
- /* First, we look for existing symlinks to the target device. */
- while (++li, (l = l->next) != NULL)
- {
- if (strcmp (l->data, i->data))
- continue;
- /* Existing symlink found - don't output a new one.
- * If ISDEV, we output the name of the existing symlink.
- */
- if (do_link_zero)
- return;
- present = 1;
- if (isdev)
- printf (" %s", list_nth (&devls, li)->data);
- }
-
- /* If we found no existing symlinks for the target device... */
- if (!present)
- {
- char buf[256];
- snprintf (buf, sizeof (buf), count || do_link_zero ? "%s%d" : "%s",
- link, count);
- /* Find the next available (not present) symlink name.
- * We always need to do this for reasons of output consistency: if a
- * symlink is created by udev as a result of use of this program, we
- * DON'T want different output!
- */
- while (list_search (&devls, buf))
- {
- if (do_link_zero)
- return;
- snprintf (buf, sizeof (buf), "%s%d", link, ++count);
- }
- /* If ISDEV, output it. */
- if (isdev && (numbered_links || count == 0))
- printf (" %s", buf);
- /* If the link isn't in our "existing links" list, add it and increment
- * our counter.
- */
- if (!list_search (&devls, buf))
- {
- if (do_link_zero)
- return;
- list_append (&devls, buf);
- ++count;
- }
- }
- }
-
- list_delete (&devls);
- list_delete (&devlinks);
-}
-
-
-/* Populate a device list from a capabilities list. */
-static void
-populate_device_list (struct list_t *out, const struct list_t *caps)
-{
- const struct list_item_t *cap, *dev;
- cap = (const struct list_item_t *)caps;
- dev = (const struct list_item_t *)&Devices;
- while ((cap = cap->next) != NULL && (dev = dev->next) != NULL)
- if (cap->data[0] != '0')
- list_append (out, dev->data);
-}
-
-
-int
-main (int argc, char *argv[])
-{
- const cap_dev_t *capdev;
-
- progname = argv[0];
- debug = argc > 2 && !strcmp (argv[2], "-d");
-
- if (argc < 2 || argc > 2 + debug)
- msgexit ("usage: cdsymlinks DEVICE [-d]");
-
- if (chdir ("/dev"))
- errexit ("can't chdir /dev");
-
- read_defaults ();
- populate_capability_lists ();
-
- /* Construct the device lists from the capability lists.
- * (We assume that all relevant devices can read CDs.)
- */
- foreach_cap_dev_noCD (capdev)
- populate_device_list (capdev->dev, capdev->cap);
-
- if (debug)
- {
- printf ("Devices:");
- const struct list_item_t *item = (const struct list_item_t *)&Devices;
- while ((item = item->next) != NULL)
- printf (" %s", item->data);
-
- printf ("\nCDROM : (all)");
- item = (const struct list_item_t *)&dev_CD;
- while ((item = item->next) != NULL)
- printf (" %s", item->data);
- puts ("");
-
- foreach_cap_dev_noCD (capdev)
- {
- printf ("%-10s:", capdev->label);
- list_print (capdev->cap, stdout);
- list_print (capdev->dev, stdout);
- puts ("");
- }
-
- }
-
- /* Write the symlink names. */
- foreach_cap_dev (capdev)
- if (list_search (&allowed_output, capdev->label))
- {
- do_output (argv[1], capdev->symlink, capdev->dev, 0);
- if (link_zero)
- do_output (argv[1], capdev->symlink, capdev->dev, 1);
- }
- puts ("");
-
- return 0;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-24 05:06:40 +0000