+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
#include <talloc/talloc.h>
+#include <list/list.h>
+#include <log/log.h>
#include <pb-protocol/pb-protocol.h>
#include "device-handler.h"
+#include "discover-server.h"
+#include "parser.h"
+#include "udev.h"
+#include "paths.h"
+
+#define MOUNT_BIN "/bin/mount"
+
+#define UMOUNT_BIN "/bin/umount"
struct device_handler {
struct discover_server *server;
struct device *devices;
int n_devices;
+
+ struct list contexts;
};
-struct device_handler *device_handler_init(struct discover_server *server)
+struct mount_map {
+ char *device_path;
+ char *mount_point;
+};
+
+int device_handler_get_current_devices(struct device_handler *handler,
+ const struct device **devices)
{
- struct device_handler *handler;
+ *devices = handler->devices;
+ return handler->n_devices;
+}
- handler = talloc(NULL, struct device_handler);
- handler->devices = NULL;
- handler->n_devices = 0;
+static int mkdir_recursive(const char *dir)
+{
+ struct stat statbuf;
+ char *str, *sep;
+ int mode = 0755;
- return handler;
+ if (!*dir)
+ return 0;
+
+ if (!stat(dir, &statbuf)) {
+ if (!S_ISDIR(statbuf.st_mode)) {
+ pb_log("%s: %s exists, but isn't a directory\n",
+ __func__, dir);
+ return -1;
+ }
+ return 0;
+ }
+
+ str = talloc_strdup(NULL, dir);
+ sep = strchr(*str == '/' ? str + 1 : str, '/');
+
+ while (1) {
+
+ /* terminate the path at sep */
+ if (sep)
+ *sep = '\0';
+
+ if (mkdir(str, mode) && errno != EEXIST) {
+ pb_log("mkdir(%s): %s\n", str, strerror(errno));
+ return -1;
+ }
+
+ if (!sep)
+ break;
+
+ /* reset dir to the full path */
+ strcpy(str, dir);
+ sep = strchr(sep + 1, '/');
+ }
+
+ talloc_free(str);
+
+ return 0;
}
-void device_handler_destroy(struct device_handler *devices)
+static int rmdir_recursive(const char *base, const char *dir)
{
- talloc_free(devices);
+ char *cur, *pos;
+
+ /* sanity check: make sure that dir is within base */
+ if (strncmp(base, dir, strlen(base)))
+ return -1;
+
+ cur = talloc_strdup(NULL, dir);
+
+ while (strcmp(base, dir)) {
+
+ rmdir(dir);
+
+ /* null-terminate at the last slash */
+ pos = strrchr(dir, '/');
+ if (!pos)
+ break;
+
+ *pos = '\0';
+ }
+
+ talloc_free(cur);
+
+ return 0;
}
-static struct boot_option options[] = {
- {
- .id = "1.1",
- .name = "meep one",
- .description = "meep description one",
- .icon_file = "meep.one.png",
- .boot_args = "root=/dev/sda1",
- },
-};
+static void setup_device_links(struct discover_context *ctx)
+{
+ struct link {
+ char *env, *dir;
+ } *link, links[] = {
+ {
+ .env = "ID_FS_UUID",
+ .dir = "disk/by-uuid"
+ },
+ {
+ .env = "ID_FS_LABEL",
+ .dir = "disk/by-label"
+ },
+ {
+ .env = NULL
+ }
+ };
-static struct device device = {
- .id = "1",
- .name = "meep",
- .description = "meep description",
- .icon_file = "meep.png",
- .n_options = 1,
- .options = options,
-};
+ for (link = links; link->env; link++) {
+ char *enc, *dir, *path;
+ const char *value;
-int device_handler_get_current_devices(struct device_handler *handler,
- struct device **devices)
+ value = udev_event_param(ctx->event, link->env);
+ if (!value || !*value)
+ continue;
+
+ enc = encode_label(ctx, value);
+ dir = join_paths(ctx, mount_base(), link->dir);
+ path = join_paths(ctx, dir, value);
+ if (!mkdir_recursive(dir)) {
+ unlink(path);
+ if (symlink(ctx->mount_path, path)) {
+ pb_log("symlink(%s,%s): %s\n",
+ ctx->mount_path, path,
+ strerror(errno));
+ talloc_free(path);
+ } else {
+ int i = ctx->n_links++;
+ ctx->links = talloc_realloc(ctx,
+ ctx->links, char *,
+ ctx->n_links);
+ ctx->links[i] = path;
+ }
+
+ }
+
+ talloc_free(dir);
+ talloc_free(enc);
+ }
+}
+
+static void remove_device_links(struct discover_context *ctx)
{
- *devices = &device;
- return 1;
+ int i;
+
+ for (i = 0; i < ctx->n_links; i++)
+ unlink(ctx->links[i]);
}
+static int mount_device(struct discover_context *ctx)
+{
+ const char *mountpoint;
+ int status;
+ pid_t pid;
-int device_handler_event(struct device_handler *handler,
+ if (!ctx->mount_path) {
+ mountpoint = mountpoint_for_device(ctx->device_path);
+ ctx->mount_path = talloc_strdup(ctx, mountpoint);
+ }
+
+ if (mkdir_recursive(ctx->mount_path))
+ pb_log("couldn't create mount directory %s: %s\n",
+ ctx->mount_path, strerror(errno));
+
+ pid = fork();
+ if (pid == -1) {
+ pb_log("%s: fork failed: %s\n", __func__, strerror(errno));
+ goto out_rmdir;
+ }
+
+ if (pid == 0) {
+ execl(MOUNT_BIN, MOUNT_BIN, ctx->device_path, ctx->mount_path,
+ "-o", "ro", NULL);
+ exit(EXIT_FAILURE);
+ }
+
+ if (waitpid(pid, &status, 0) == -1) {
+ pb_log("%s: waitpid failed: %s\n", __func__,
+ strerror(errno));
+ goto out_rmdir;
+ }
+
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ pb_log("%s: mount failed (%d): %s\n", __func__,
+ WEXITSTATUS(status), ctx->event->device);
+ goto out_rmdir;
+ }
+
+ setup_device_links(ctx);
+ return 0;
+
+out_rmdir:
+ rmdir_recursive(mount_base(), ctx->mount_path);
+ return -1;
+}
+
+static int umount_device(struct discover_context *ctx)
+{
+ int status;
+ pid_t pid;
+
+ remove_device_links(ctx);
+
+ pid = fork();
+ if (pid == -1) {
+ pb_log("%s: fork failed: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ if (pid == 0) {
+ execl(UMOUNT_BIN, UMOUNT_BIN, ctx->mount_path, NULL);
+ exit(EXIT_FAILURE);
+ }
+
+ if (waitpid(pid, &status, 0) == -1) {
+ pb_log("%s: waitpid failed: %s\n", __func__,
+ strerror(errno));
+ return -1;
+ }
+
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+ return -1;
+
+ rmdir_recursive(mount_base(), ctx->mount_path);
+
+ return 0;
+}
+
+static struct discover_context *find_context(struct device_handler *handler,
+ const char *id)
+{
+ struct discover_context *ctx;
+
+ list_for_each_entry(&handler->contexts, ctx, list) {
+ if (!strcmp(ctx->id, id))
+ return ctx;
+ }
+
+ return NULL;
+}
+
+static int destroy_context(void *arg)
+{
+ struct discover_context *ctx = arg;
+
+ list_remove(&ctx->list);
+ umount_device(ctx);
+
+ return 0;
+}
+
+static int handle_add_event(struct device_handler *handler,
struct udev_event *event)
{
+ struct discover_context *ctx;
+ const char *devname;
+ int rc;
+
+ /* create our context */
+ ctx = talloc(handler, struct discover_context);
+ ctx->event = event;
+ ctx->mount_path = NULL;
+ ctx->links = NULL;
+ ctx->n_links = 0;
+
+ ctx->id = talloc_strdup(ctx, event->device);
+
+ devname = udev_event_param(ctx->event, "DEVNAME");
+ if (!devname) {
+ pb_log("no devname for %s?\n", event->device);
+ return 0;
+ }
+
+ ctx->device_path = talloc_strdup(ctx, devname);
+
+ rc = mount_device(ctx);
+ if (rc) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ list_add(&handler->contexts, &ctx->list);
+ talloc_set_destructor(ctx, destroy_context);
+
+ /* set up the top-level device */
+ ctx->device = talloc_zero(ctx, struct device);
+ ctx->device->id = talloc_strdup(ctx->device, ctx->id);
+ list_init(&ctx->device->boot_options);
+
+ /* run the parsers */
+ iterate_parsers(ctx);
+
+ discover_server_notify_add(handler->server, ctx->device);
+
return 0;
}
+
+static int handle_remove_event(struct device_handler *handler,
+ struct udev_event *event)
+{
+ struct discover_context *ctx;
+
+ ctx = find_context(handler, event->device);
+ if (!ctx)
+ return 0;
+
+ discover_server_notify_remove(handler->server, ctx->device);
+
+ talloc_free(ctx);
+
+ return 0;
+}
+
+int device_handler_event(struct device_handler *handler,
+ struct udev_event *event)
+{
+ int rc;
+
+ switch (event->action) {
+ case UDEV_ACTION_ADD:
+ rc = handle_add_event(handler, event);
+ break;
+
+ case UDEV_ACTION_REMOVE:
+ rc = handle_remove_event(handler, event);
+ break;
+ }
+
+ return rc;
+}
+
+struct device_handler *device_handler_init(struct discover_server *server)
+{
+ struct device_handler *handler;
+
+ handler = talloc(NULL, struct device_handler);
+ handler->devices = NULL;
+ handler->n_devices = 0;
+ handler->server = server;
+
+ list_init(&handler->contexts);
+
+ /* set up our mount point base */
+ mkdir_recursive(mount_base());
+
+ parser_init();
+
+ return handler;
+}
+
+void device_handler_destroy(struct device_handler *handler)
+{
+ talloc_free(handler);
+}
projects / petitboot / blobdiff