+
+static char *device_from_addr(void *ctx, struct pb_url *url)
+{
+ char *ipaddr, *buf, *tok, *dev = NULL;
+ bool ipv6_route;
+ const char *delim = " ";
+ struct sockaddr_in *ipv4;
+ struct sockaddr_in6 *ipv6;
+ struct addrinfo *res;
+ struct process *p;
+ int rc;
+
+ /* Confirm url->host is either a valid hostname, or a
+ * valid IPv4 or IPv6 address */
+ rc = getaddrinfo(url->host, NULL, NULL, &res);
+ if (rc) {
+ pb_debug("%s: Invalid URL\n",__func__);
+ return NULL;
+ }
+
+ switch (res->ai_family) {
+ case AF_INET: /* ipv4 */
+ ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
+ ipv4 = (struct sockaddr_in *) res->ai_addr;
+ inet_ntop(AF_INET, &(ipv4->sin_addr), ipaddr, INET_ADDRSTRLEN);
+ ipv6_route = false;
+ break;
+ case AF_INET6: /* ipv6 */
+ ipaddr = talloc_array(ctx,char,INET6_ADDRSTRLEN);
+ ipv6 = (struct sockaddr_in6 *) res->ai_addr;
+ inet_ntop(AF_INET6, &(ipv6->sin6_addr), ipaddr, INET6_ADDRSTRLEN);
+ ipv6_route = true;
+ break;
+ default: /* error */
+ freeaddrinfo(res);
+ return NULL;
+ }
+ freeaddrinfo(res);
+
+ const char *argv[] = {
+ pb_system_apps.ip,
+ ipv6_route ? "-6" : "-4",
+ "route", "show", "to", "match",
+ ipaddr,
+ NULL
+ };
+
+ p = process_create(ctx);
+
+ p->path = pb_system_apps.ip;
+ p->argv = argv;
+ p->keep_stdout = true;
+
+ rc = process_run_sync(p);
+
+ if (rc || p->exit_status) {
+ /* ip has complained for some reason; most likely
+ * there is no route to the host - bail out */
+ pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
+ pb_debug("ip buf: %s\n", p->stdout_buf);
+ process_release(p);
+ return NULL;
+ }
+
+ buf = p->stdout_buf;
+ /* If a route is found, ip-route output will be of the form
+ * "... dev DEVNAME ... " */
+ tok = strtok(buf, delim);
+ while (tok) {
+ if (!strcmp(tok, "dev")) {
+ tok = strtok(NULL, delim);
+ dev = talloc_strdup(ctx, tok);
+ break;
+ }
+ tok = strtok(NULL, delim);
+ }
+
+ process_release(p);
+ if (dev)
+ pb_debug("%s: Found interface '%s'\n", __func__,dev);
+ return dev;
+}
+
+static void process_url_cb(struct load_url_result *result, void *data)
+{
+ struct device_handler *handler;
+ struct discover_context *ctx;
+ struct discover_device *dev;
+ struct event *event = data;
+ const char *mac;
+
+ if (result->status != LOAD_OK) {
+ pb_log_fn("Load failed for %s\n", result->url->full);
+ return;
+ }
+
+ if (!event)
+ return;
+
+ handler = talloc_parent(event);
+ if (!handler)
+ return;
+
+ event->device = device_from_addr(event, result->url);
+ if (!event->device) {
+ pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
+ event->device = talloc_asprintf(event, "local");
+ }
+
+ mac = event_get_param(event, "mac");
+ char *url = talloc_asprintf(event, "file://%s", result->local);
+ event_set_param(event, "pxeconffile-local", url);
+
+ dev = discover_device_create(handler, mac, event->device);
+ ctx = device_handler_discover_context_create(handler, dev);
+ talloc_steal(ctx, event);
+ ctx->event = event;
+
+ iterate_parsers(ctx);
+
+ device_handler_discover_context_commit(handler, ctx);
+
+ talloc_unlink(handler, ctx);
+}
+
+void device_handler_process_url(struct device_handler *handler,
+ const char *url, const char *mac, const char *ip)
+{
+ struct discover_context *ctx;
+ struct discover_device *dev;
+ bool allow_async = false;
+ struct pb_url *pb_url;
+ struct event *event;
+
+ event = talloc_zero(handler, struct event);
+ event->type = EVENT_TYPE_USER;
+ event->action = EVENT_ACTION_URL;
+
+ pb_url = pb_url_parse(event, url);
+ if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
+ device_handler_status_err(handler, _("Invalid config URL!"));
+ talloc_free(event);
+ return;
+ }
+
+ if (url[strlen(url) - 1] == '/') {
+ event_set_param(event, "pxepathprefix", url);
+ event_set_param(event, "mac", mac);
+ event_set_param(event, "ip", ip);
+ event->device = device_from_addr(event, pb_url);
+ if (!event->device) {
+ device_handler_status_err(handler,
+ _("Unable to route to host %s"),
+ pb_url->host);
+ talloc_free(event);
+ return;
+ }
+ } else {
+ event_set_param(event, "pxeconffile", url);
+ allow_async = true;
+ }
+
+ if (pb_url->scheme == pb_url_file)
+ event->device = talloc_asprintf(event, "local");
+ else if (allow_async) {
+ /* If file is remote load asynchronously before passing to
+ * parser. This allows us to wait for network to be available */
+ if (!load_url_async(handler, pb_url, process_url_cb, event,
+ NULL, handler)) {
+ pb_log("Failed to load url %s\n", pb_url->full);
+ device_handler_status_err(handler, _("Failed to load URL!"));
+ talloc_free(event);
+ }
+ return;
+ }
+
+ /* If path is local we can parse straight away */
+
+ dev = discover_device_create(handler, mac, event->device);
+ if (pb_url->scheme == pb_url_file)
+ dev->device->type = DEVICE_TYPE_ANY;
+ ctx = device_handler_discover_context_create(handler, dev);
+ talloc_steal(ctx, event);
+ ctx->event = event;
+
+ iterate_parsers(ctx);
+
+ device_handler_discover_context_commit(handler, ctx);
+
+ talloc_unlink(handler, ctx);
+}
+
+static void plugin_install_cb(struct process *process)
+{
+ struct device_handler *handler = process->data;
+
+ if (!handler) {
+ pb_log_fn("Missing data!\n");
+ return;
+ }
+
+ handler->plugin_installing = false;
+ if (process->exit_status) {
+ device_handler_status_err(handler, "Plugin failed to install!");
+ pb_log("Failed to install plugin:\n%s\n", process->stdout_buf);
+ }
+}
+
+void device_handler_install_plugin(struct device_handler *handler,
+ const char *plugin_file)
+{
+ struct process *p;
+ int result;
+
+ if (handler->plugin_installing) {
+ pb_log("Plugin install cancelled - install already running");
+ return;
+ }
+
+ p = process_create(handler);
+ if (!p) {
+ pb_log("install_plugin: Failed to create process\n");
+ return;
+ }
+
+ const char *argv[] = {
+ pb_system_apps.pb_plugin,
+ "install",
+ "auto",
+ plugin_file,
+ NULL
+ };
+
+ p->path = pb_system_apps.pb_plugin;
+ p->argv = argv;
+ p->exit_cb = plugin_install_cb;
+ p->data = handler;
+ p->keep_stdout = true;
+
+ result = process_run_async(p);
+
+ if (result)
+ device_handler_status_err(handler, "Could not install plugin");
+ else
+ handler->plugin_installing = true;
+}
+
+#ifndef PETITBOOT_TEST
+
+/**
+ * context_commit - Commit a temporary discovery context to the handler,
+ * and notify the clients about any new options / devices
+ */
+void device_handler_discover_context_commit(struct device_handler *handler,
+ struct discover_context *ctx)
+{
+ struct discover_device *dev = ctx->device;
+ struct discover_boot_option *opt, *tmp;
+
+ if (!device_lookup_by_uuid(handler, dev->uuid))
+ device_handler_add_device(handler, dev);
+
+ /* move boot options from the context to the device */
+ list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
+ list_remove(&opt->list);
+
+ /* All boot options need at least a kernel image */
+ if (!opt->boot_image || !opt->boot_image->url) {
+ pb_log("boot option %s is missing boot image, ignoring\n",
+ opt->option->id);
+ talloc_free(opt);
+ continue;
+ }
+
+ if (boot_option_resolve(opt, handler)) {
+ pb_log("boot option %s is resolved, "
+ "sending to clients\n",
+ opt->option->id);
+ list_add_tail(&dev->boot_options, &opt->list);
+ talloc_steal(dev, opt);
+ boot_option_finalise(handler, opt);
+ notify_boot_option(handler, opt);
+ } else {
+ if (!opt->source->resolve_resource) {
+ pb_log("parser %s gave us an unresolved "
+ "resource (%s), but no way to "
+ "resolve it\n",
+ opt->source->name, opt->option->id);
+ talloc_free(opt);
+ } else {
+ pb_log("boot option %s is unresolved, "
+ "adding to queue\n",
+ opt->option->id);
+ list_add(&handler->unresolved_boot_options,
+ &opt->list);
+ talloc_steal(handler, opt);
+ }
+ }
+ }
+}
+
+void device_handler_add_plugin_option(struct device_handler *handler,
+ struct plugin_option *opt)
+{
+ struct plugin_option *tmp;
+ unsigned int i;
+
+ for (i = 0; i < handler->n_plugins; i++) {
+ tmp = handler->plugins[i];
+ /* If both id and version match, ignore */
+ if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
+ strcmp(opt->version, tmp->version) == 0) {
+ pb_log("discover: Plugin '%s' already exists, ignoring\n",
+ opt->id);
+ return;
+ }
+ }
+
+ handler->plugins = talloc_realloc(handler, handler->plugins,
+ struct plugin_option *, handler->n_plugins + 1);
+ if (!handler->plugins) {
+ pb_log("Failed to allocate memory for new plugin\n");
+ handler->n_plugins = 0;
+ return;
+ }
+
+ handler->plugins[handler->n_plugins++] = opt;
+ discover_server_notify_plugin_option_add(handler->server, opt);
+}
+
+static void device_handler_update_lang(const char *lang)
+{
+ const char *cur_lang;
+
+ if (!lang)
+ return;
+
+ cur_lang = setlocale(LC_ALL, NULL);
+ if (cur_lang && !strcmp(cur_lang, lang))
+ return;
+
+ setlocale(LC_ALL, lang);
+}
+
+static int device_handler_init_sources(struct device_handler *handler)
+{
+ /* init our device sources: udev, network and user events */
+ handler->user_event = user_event_init(handler, handler->waitset);
+ if (!handler->user_event)
+ return -1;
+
+ handler->network = network_init(handler, handler->waitset,
+ handler->dry_run);
+ if (!handler->network)
+ return -1;
+
+ handler->udev = udev_init(handler, handler->waitset);
+ if (!handler->udev)
+ return -1;
+
+ return 0;
+}
+
+static void device_handler_reinit_sources(struct device_handler *handler)
+{
+ /* if we haven't initialised sources previously (becuase we started in
+ * safe mode), then init once here. */
+ if (!(handler->udev || handler->network || handler->user_event)) {
+ device_handler_init_sources(handler);
+ return;
+ }
+
+ system_info_reinit();
+
+ network_shutdown(handler->network);
+ handler->network = network_init(handler, handler->waitset,
+ handler->dry_run);
+
+ udev_reinit(handler->udev);
+}
+
+static inline const char *get_device_path(struct discover_device *dev)
+{
+ return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
+}
+
+static char *check_subvols(struct discover_device *dev)
+{
+ const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
+ struct stat sb;
+ char *path;
+ int rc;
+
+ if (strncmp(fstype, "btrfs", strlen("btrfs")))
+ return dev->mount_path;
+
+ /* On btrfs a device's root may be under a subvolume path */
+ path = join_paths(dev, dev->mount_path, "@");
+ rc = stat(path, &sb);
+ if (!rc && S_ISDIR(sb.st_mode)) {
+ pb_debug("Using '%s' for btrfs root path\n", path);
+ return path;
+ }
+
+ talloc_free(path);
+ return dev->mount_path;
+}
+
+static bool check_existing_mount(struct discover_device *dev)
+{
+ struct stat devstat, mntstat;
+ const char *device_path;
+ struct mntent *mnt;
+ FILE *fp;
+ int rc;
+
+ device_path = get_device_path(dev);
+
+ rc = stat(device_path, &devstat);
+ if (rc) {
+ pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
+ return false;
+ }
+
+ if (!S_ISBLK(devstat.st_mode)) {
+ pb_debug("%s: %s isn't a block device?\n", __func__,
+ dev->device_path);
+ return false;
+ }
+
+ fp = fopen("/proc/self/mounts", "r");
+
+ for (;;) {
+ mnt = getmntent(fp);
+ if (!mnt)
+ break;
+
+ if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
+ continue;
+
+ rc = stat(mnt->mnt_fsname, &mntstat);
+ if (rc)
+ continue;
+
+ if (!S_ISBLK(mntstat.st_mode))
+ continue;
+
+ if (mntstat.st_rdev == devstat.st_rdev) {
+ dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
+ dev->root_path = check_subvols(dev);
+ dev->mounted_rw = !!hasmntopt(mnt, "rw");
+ dev->mounted = true;
+ dev->unmount = false;
+
+ pb_debug("%s: %s is already mounted (r%c) at %s\n",
+ __func__, dev->device_path,
+ dev->mounted_rw ? 'w' : 'o',
+ mnt->mnt_dir);
+ break;
+ }
+ }
+
+ fclose(fp);
+
+ return mnt != NULL;
+}
+
+/*
+ * Attempt to mount a filesystem safely, while handling certain filesytem-
+ * specific options
+ */
+static int try_mount(const char *device_path, const char *mount_path,
+ const char *fstype, unsigned long flags,
+ bool have_snapshot)
+{
+ const char *fs, *safe_opts;
+ int rc;
+
+ /* Mount ext3 as ext4 instead so 'norecovery' can be used */
+ if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
+ pb_debug("Mounting ext3 filesystem as ext4\n");
+ fs = "ext4";
+ } else
+ fs = fstype;
+
+ if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
+ strncmp(fs, "ext4", strlen("ext4")) == 0)
+ safe_opts = "norecovery";
+ else
+ safe_opts = NULL;
+
+ errno = 0;
+ /* If no snapshot is available don't attempt recovery */
+ if (!have_snapshot)
+ return mount(device_path, mount_path, fs, flags, safe_opts);
+
+ rc = mount(device_path, mount_path, fs, flags, NULL);
+
+ if (!rc)
+ return rc;
+
+ /* Mounting failed; some filesystems will fail to mount if a recovery
+ * journal exists (eg. cross-endian XFS), so try again with norecovery
+ * where that option is available.
+ * If mounting read-write just return the error as norecovery is not a
+ * valid option */
+ if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
+ return rc;
+
+ errno = 0;
+ return mount(device_path, mount_path, fs, flags, safe_opts);
+}
+
+static int mount_device(struct discover_device *dev)
+{
+ const char *fstype, *device_path;
+ int rc;
+
+ if (!dev->device_path)
+ return -1;
+
+ if (dev->mounted)
+ return 0;
+
+ if (check_existing_mount(dev))
+ return 0;
+
+ fstype = discover_device_get_param(dev, "ID_FS_TYPE");
+ if (!fstype)
+ return 0;
+
+ dev->mount_path = join_paths(dev, mount_base(),
+ dev->device_path);
+
+ if (pb_mkdir_recursive(dev->mount_path)) {
+ pb_log("couldn't create mount directory %s: %s\n",
+ dev->mount_path, strerror(errno));
+ goto err_free;
+ }
+
+ device_path = get_device_path(dev);
+
+ pb_log("mounting device %s read-only\n", dev->device_path);
+ rc = try_mount(device_path, dev->mount_path, fstype,
+ MS_RDONLY | MS_SILENT, dev->ramdisk);
+
+ /* If mount fails clean up any snapshot and try again */
+ if (rc && dev->ramdisk) {
+ pb_log("couldn't mount snapshot for %s: mount failed: %s\n",
+ device_path, strerror(errno));
+ pb_log("falling back to actual device\n");
+
+ devmapper_destroy_snapshot(dev);
+
+ device_path = get_device_path(dev);
+ pb_log("mounting device %s read-only\n", dev->device_path);
+ rc = try_mount(device_path, dev->mount_path, fstype,
+ MS_RDONLY | MS_SILENT, dev->ramdisk);
+ }
+
+ if (!rc) {
+ dev->mounted = true;
+ dev->mounted_rw = false;
+ dev->unmount = true;
+ dev->root_path = check_subvols(dev);
+ return 0;
+ }
+
+ pb_log("couldn't mount device %s: mount failed: %s\n",
+ device_path, strerror(errno));
+
+ pb_rmdir_recursive(mount_base(), dev->mount_path);
+err_free:
+ talloc_free(dev->mount_path);
+ dev->mount_path = NULL;
+ return -1;
+}
+
+static int umount_device(struct discover_device *dev)
+{
+ const char *device_path;
+ int rc;
+
+ if (!dev->mounted || !dev->unmount)
+ return 0;
+
+ device_path = get_device_path(dev);
+
+ pb_log("unmounting device %s\n", device_path);
+ rc = umount(dev->mount_path);
+ if (rc)
+ return -1;
+
+ dev->mounted = false;
+ devmapper_destroy_snapshot(dev);
+
+ pb_rmdir_recursive(mount_base(), dev->mount_path);
+
+ talloc_free(dev->mount_path);
+ dev->mount_path = NULL;
+ dev->root_path = NULL;
+
+ return 0;
+}
+
+int device_request_write(struct discover_device *dev, bool *release)
+{
+ const char *fstype, *device_path;
+ const struct config *config;
+ int rc;
+
+ *release = false;
+
+ config = config_get();
+ if (!config->allow_writes)
+ return -1;
+
+ if (!dev->mounted)
+ return -1;
+
+ if (dev->mounted_rw)
+ return 0;
+
+ fstype = discover_device_get_param(dev, "ID_FS_TYPE");
+
+ device_path = get_device_path(dev);
+
+ pb_log("remounting device %s read-write\n", device_path);
+
+ rc = umount(dev->mount_path);
+ if (rc) {
+ pb_log("Failed to unmount %s: %s\n",
+ dev->mount_path, strerror(errno));
+ return -1;
+ }
+
+ rc = try_mount(device_path, dev->mount_path, fstype,
+ MS_SILENT, dev->ramdisk);
+ if (rc)
+ goto mount_ro;
+
+ dev->mounted_rw = true;
+ *release = true;
+ return 0;
+
+mount_ro:
+ pb_log("Unable to remount device %s read-write: %s\n",
+ device_path, strerror(errno));
+ rc = try_mount(device_path, dev->mount_path, fstype,
+ MS_RDONLY | MS_SILENT, dev->ramdisk);
+ if (rc)
+ pb_log("Unable to recover mount for %s: %s\n",
+ device_path, strerror(errno));
+ return -1;
+}
+
+void device_release_write(struct discover_device *dev, bool release)
+{
+ const char *fstype, *device_path;
+
+ if (!release)
+ return;
+
+ device_path = get_device_path(dev);
+
+ fstype = discover_device_get_param(dev, "ID_FS_TYPE");
+
+ pb_log("remounting device %s read-only\n", device_path);
+
+ if (umount(dev->mount_path)) {
+ pb_log("Failed to unmount %s\n", dev->mount_path);
+ return;
+ }
+ dev->mounted_rw = dev->mounted = false;
+
+ if (dev->ramdisk) {
+ devmapper_merge_snapshot(dev);
+ /* device_path becomes stale after merge */
+ device_path = get_device_path(dev);
+ }
+
+ if (try_mount(device_path, dev->mount_path, fstype,
+ MS_RDONLY | MS_SILENT, dev->ramdisk))
+ pb_log("Failed to remount %s read-only: %s\n",
+ device_path, strerror(errno));
+ else
+ dev->mounted = true;
+}
+
+void device_sync_snapshots(struct device_handler *handler, const char *device)
+{
+ struct discover_device *dev = NULL;
+ unsigned int i;
+
+ if (device) {
+ /* Find matching device and sync */
+ dev = device_lookup_by_name(handler, device);
+ if (!dev) {
+ pb_log("%s: device name '%s' unrecognised\n",
+ __func__, device);
+ return;
+ }
+ if (dev->ramdisk)
+ device_release_write(dev, true);
+ else
+ pb_log("%s has no snapshot to merge, skipping\n",
+ dev->device->id);
+ return;
+ }
+
+ /* Otherwise sync all relevant devices */
+ for (i = 0; i < handler->n_devices; i++) {
+ dev = handler->devices[i];
+ if (dev->device->type != DEVICE_TYPE_DISK &&
+ dev->device->type != DEVICE_TYPE_USB)
+ continue;
+ if (dev->ramdisk)
+ device_release_write(dev, true);
+ else
+ pb_log("%s has no snapshot to merge, skipping\n",
+ dev->device->id);
+ }
+}
+
+#else
+
+void device_handler_discover_context_commit(
+ struct device_handler *handler __attribute__((unused)),
+ struct discover_context *ctx __attribute__((unused)))
+{
+ pb_log_fn("stubbed out for test cases\n");
+}
+
+static void device_handler_update_lang(const char *lang __attribute__((unused)))
+{
+}
+
+static int device_handler_init_sources(
+ struct device_handler *handler __attribute__((unused)))
+{
+ return 0;
+}
+
+static void device_handler_reinit_sources(
+ struct device_handler *handler __attribute__((unused)))
+{
+}
+
+static int umount_device(struct discover_device *dev __attribute__((unused)))
+{
+ return 0;
+}
+
+static int __attribute__((unused)) mount_device(
+ struct discover_device *dev __attribute__((unused)))
+{
+ return 0;
+}
+
+int device_request_write(struct discover_device *dev __attribute__((unused)),
+ bool *release)
+{
+ *release = true;
+ return 0;
+}
+
+void device_release_write(struct discover_device *dev __attribute__((unused)),
+ bool release __attribute__((unused)))
+{
+}
+
+void device_sync_snapshots(
+ struct device_handler *handler __attribute__((unused)),
+ const char *device __attribute__((unused)))
+{
+}
+