+size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
+{
+ struct udev_device *dev = event->dev;
+ enum subst_type {
+ SUBST_UNKNOWN,
+ SUBST_TEMP_NODE,
+ SUBST_ATTR,
+ SUBST_ENV,
+ SUBST_KERNEL,
+ SUBST_KERNEL_NUMBER,
+ SUBST_DRIVER,
+ SUBST_DEVPATH,
+ SUBST_ID,
+ SUBST_MAJOR,
+ SUBST_MINOR,
+ SUBST_RESULT,
+ SUBST_PARENT,
+ SUBST_NAME,
+ SUBST_LINKS,
+ SUBST_ROOT,
+ SUBST_SYS,
+ };
+ static const struct subst_map {
+ char *name;
+ char fmt;
+ enum subst_type type;
+ } map[] = {
+ { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
+ { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
+ { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
+ { .name = "env", .fmt = 'E', .type = SUBST_ENV },
+ { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
+ { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
+ { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
+ { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
+ { .name = "id", .fmt = 'b', .type = SUBST_ID },
+ { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
+ { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
+ { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
+ { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
+ { .name = "name", .fmt = 'D', .type = SUBST_NAME },
+ { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
+ { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
+ { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
+ };
+ const char *from;
+ char *s;
+ size_t l;
+
+ from = src;
+ s = dest;
+ l = size;
+
+ while (1) {
+ enum subst_type type = SUBST_UNKNOWN;
+ char attrbuf[UTIL_PATH_SIZE];
+ char *attr = NULL;
+
+ while (from[0] != '\0') {
+ if (from[0] == '$') {
+ /* substitute named variable */
+ unsigned int i;
+
+ if (from[1] == '$') {
+ from++;
+ goto copy;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(map); i++) {
+ if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
+ type = map[i].type;
+ from += strlen(map[i].name)+1;
+ dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
+ goto subst;
+ }
+ }
+ } else if (from[0] == '%') {
+ /* substitute format char */
+ unsigned int i;
+
+ if (from[1] == '%') {
+ from++;
+ goto copy;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(map); i++) {
+ if (from[1] == map[i].fmt) {
+ type = map[i].type;
+ from += 2;
+ dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
+ goto subst;
+ }
+ }
+ }
+copy:
+ /* copy char */
+ if (l == 0)
+ goto out;
+ s[0] = from[0];
+ from++;
+ s++;
+ l--;
+ }
+
+ goto out;
+subst:
+ /* extract possible $format{attr} */
+ if (from[0] == '{') {
+ unsigned int i;
+
+ from++;
+ for (i = 0; from[i] != '}'; i++) {
+ if (from[i] == '\0') {
+ err(event->udev, "missing closing brace for format '%s'\n", src);
+ goto out;
+ }
+ }
+ if (i >= sizeof(attrbuf))
+ goto out;
+ memcpy(attrbuf, from, i);
+ attrbuf[i] = '\0';
+ from += i+1;
+ attr = attrbuf;
+ } else {
+ attr = NULL;
+ }
+
+ switch (type) {
+ case SUBST_DEVPATH:
+ l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
+ dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
+ break;
+ case SUBST_KERNEL:
+ l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+ dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
+ break;
+ case SUBST_KERNEL_NUMBER:
+ if (udev_device_get_sysnum(dev) == NULL)
+ break;
+ l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
+ dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
+ break;
+ case SUBST_ID:
+ if (event->dev_parent == NULL)
+ break;
+ l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
+ dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
+ break;
+ case SUBST_DRIVER: {
+ const char *driver;
+
+ if (event->dev_parent == NULL)
+ break;
+
+ driver = udev_device_get_driver(event->dev_parent);
+ if (driver == NULL)
+ break;
+ l = util_strpcpy(&s, l, driver);
+ dbg(event->udev, "substitute driver '%s'\n", driver);
+ break;
+ }
+ case SUBST_MAJOR: {
+ char num[UTIL_PATH_SIZE];
+
+ sprintf(num, "%d", major(udev_device_get_devnum(dev)));
+ l = util_strpcpy(&s, l, num);
+ dbg(event->udev, "substitute major number '%s'\n", num);
+ break;
+ }
+ case SUBST_MINOR: {
+ char num[UTIL_PATH_SIZE];
+
+ sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
+ l = util_strpcpy(&s, l, num);
+ dbg(event->udev, "substitute minor number '%s'\n", num);
+ break;
+ }
+ case SUBST_RESULT: {
+ char *rest;
+ int i;
+
+ if (event->program_result == NULL)
+ break;
+ /* get part part of the result string */
+ i = 0;
+ if (attr != NULL)
+ i = strtoul(attr, &rest, 10);
+ if (i > 0) {
+ char result[UTIL_PATH_SIZE];
+ char tmp[UTIL_PATH_SIZE];
+ char *cpos;
+
+ dbg(event->udev, "request part #%d of result string\n", i);
+ util_strscpy(result, sizeof(result), event->program_result);
+ cpos = result;
+ while (--i) {
+ while (cpos[0] != '\0' && !isspace(cpos[0]))
+ cpos++;
+ while (isspace(cpos[0]))
+ cpos++;
+ }
+ if (i > 0) {
+ err(event->udev, "requested part of result string not found\n");
+ break;
+ }
+ util_strscpy(tmp, sizeof(tmp), cpos);
+ /* %{2+}c copies the whole string from the second part on */
+ if (rest[0] != '+') {
+ cpos = strchr(tmp, ' ');
+ if (cpos)
+ cpos[0] = '\0';
+ }
+ l = util_strpcpy(&s, l, tmp);
+ dbg(event->udev, "substitute part of result string '%s'\n", tmp);
+ } else {
+ l = util_strpcpy(&s, l, event->program_result);
+ dbg(event->udev, "substitute result string '%s'\n", event->program_result);
+ }
+ break;
+ }
+ case SUBST_ATTR: {
+ const char *value = NULL;
+ char vbuf[UTIL_NAME_SIZE];
+ size_t len;
+ int count;
+
+ if (attr == NULL) {
+ err(event->udev, "missing file parameter for attr\n");
+ break;
+ }
+
+ /* try to read the value specified by "[dmi/id]product_name" */
+ if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
+ value = vbuf;
+
+ /* try to read the attribute the device */
+ if (value == NULL)
+ value = udev_device_get_sysattr_value(event->dev, attr);
+
+ /* try to read the attribute of the parent device, other matches have selected */
+ if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
+ value = udev_device_get_sysattr_value(event->dev_parent, attr);
+
+ if (value == NULL)
+ break;
+
+ /* strip trailing whitespace, and replace unwanted characters */
+ if (value != vbuf)
+ util_strscpy(vbuf, sizeof(vbuf), value);
+ len = strlen(vbuf);
+ while (len > 0 && isspace(vbuf[--len]))
+ vbuf[len] = '\0';
+ count = udev_util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
+ if (count > 0)
+ info(event->udev, "%i character(s) replaced\n" , count);
+ l = util_strpcpy(&s, l, vbuf);
+ dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
+ break;
+ }
+ case SUBST_PARENT: {
+ struct udev_device *dev_parent;
+ const char *devnode;
+
+ dev_parent = udev_device_get_parent(event->dev);
+ if (dev_parent == NULL)
+ break;
+ devnode = udev_device_get_devnode(dev_parent);
+ if (devnode != NULL) {
+ size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+
+ l = util_strpcpy(&s, l, &devnode[devlen]);
+ dbg(event->udev, "found parent '%s', got node name '%s'\n",
+ udev_device_get_syspath(dev_parent), &devnode[devlen]);
+ }
+ break;
+ }
+ case SUBST_TEMP_NODE: {
+ dev_t devnum;
+ struct stat statbuf;
+ char filename[UTIL_PATH_SIZE];
+ const char *devtype;
+
+ if (event->tmp_node != NULL) {
+ l = util_strpcpy(&s, l, event->tmp_node);
+ dbg(event->udev, "tempnode: return earlier created one\n");
+ break;
+ }
+ devnum = udev_device_get_devnum(dev);
+ if (major(devnum) == 0)
+ break;
+ /* lookup kernel provided node */
+ if (udev_device_get_knodename(dev) != NULL) {
+ util_strscpyl(filename, sizeof(filename),
+ udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
+ if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
+ l = util_strpcpy(&s, l, filename);
+ dbg(event->udev, "tempnode: return kernel node\n");
+ break;
+ }
+ }
+ /* lookup /dev/{char,block}/<maj>:<min> */
+ if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
+ devtype = "block";
+ else
+ devtype = "char";
+ snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
+ udev_get_dev_path(event->udev), devtype,
+ major(udev_device_get_devnum(dev)),
+ minor(udev_device_get_devnum(dev)));
+ if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
+ l = util_strpcpy(&s, l, filename);
+ dbg(event->udev, "tempnode: return maj:min node\n");
+ break;
+ }
+ /* create temporary node */
+ dbg(event->udev, "tempnode: create temp node\n");
+ asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
+ udev_get_dev_path(event->udev), devtype,
+ major(udev_device_get_devnum(dev)),
+ minor(udev_device_get_devnum(dev)));
+ if (event->tmp_node == NULL)
+ break;
+ udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
+ l = util_strpcpy(&s, l, event->tmp_node);
+ break;
+ }
+ case SUBST_NAME:
+ if (event->name != NULL) {
+ l = util_strpcpy(&s, l, event->name);
+ dbg(event->udev, "substitute name '%s'\n", event->name);
+ } else {
+ l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+ dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
+ }
+ break;
+ case SUBST_LINKS: {
+ size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+ struct udev_list_entry *list_entry;
+
+ list_entry = udev_device_get_devlinks_list_entry(dev);
+ if (list_entry == NULL)
+ break;
+ l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
+ udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
+ l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
+ break;
+ }
+ case SUBST_ROOT:
+ l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
+ dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
+ break;
+ case SUBST_SYS:
+ l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
+ dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
+ break;
+ case SUBST_ENV:
+ if (attr == NULL) {
+ dbg(event->udev, "missing attribute\n");
+ break;
+ } else {
+ const char *value;
+
+ value = udev_device_get_property_value(event->dev, attr);
+ if (value == NULL)
+ break;
+ dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
+ l = util_strpcpy(&s, l, value);
+ break;
+ }
+ default:
+ err(event->udev, "unknown substitution type=%i\n", type);
+ break;
+ }
+ }
+
+out:
+ s[0] = '\0';
+ dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
+ return l;
+}
+
+static void rename_netif_kernel_log(struct ifreq ifr)