lib/efi: Cleanup read/write routines
[petitboot] / discover / parser.c
index 5b1a7abdab600656bc803721bef66f07bdcc9b88..54787201553010d808297eaf8cc8c1730540d0db 100644 (file)
 
+#include <fcntl.h>
 #include <stdlib.h>
 
-#include "pb-protocol/pb-protocol.h"
+#include "types/types.h"
+#include <file/file.h>
+#include <log/log.h>
+#include <talloc/talloc.h>
 
 #include "device-handler.h"
-#include "log.h"
 #include "parser.h"
-extern struct parser kboot_parser;
+#include "parser-utils.h"
+#include "paths.h"
 
-/* array of parsers, ordered by priority */
-static struct parser *parsers[] = {
-       &kboot_parser,
-       NULL
+struct p_item {
+       struct list_item list;
+       struct parser *parser;
 };
 
+STATIC_LIST(parsers);
+
+static char *local_path(struct discover_context *ctx,
+               struct discover_device *dev,
+               const char *filename)
+{
+       return join_paths(ctx, dev->root_path, filename);
+}
+
+int parser_request_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char **buf, int *len)
+
+{
+       char *path;
+       int rc;
+
+       /* we only support local files at present */
+       if (!dev->mount_path)
+               return -1;
+
+       path = local_path(ctx, dev, filename);
+
+       rc = read_file(ctx, path, buf, len);
+
+       talloc_free(path);
+
+       return rc;
+}
+
+int parser_stat_path(struct discover_context *ctx,
+               struct discover_device *dev, const char *path,
+               struct stat *statbuf)
+{
+       int rc = -1;
+       char *full_path;
+
+       /* we only support local files at present */
+       if (!dev->mount_path)
+               return -1;
+
+       full_path = local_path(ctx, dev, path);
+
+       rc = stat(full_path, statbuf);
+       if (rc) {
+               rc = -1;
+               goto out;
+       }
+
+       rc = 0;
+out:
+       talloc_free(full_path);
+
+       return rc;
+}
+
+bool parser_is_unique(struct discover_context *ctx, struct discover_device *dev,
+       const char *filename, struct list *found_list)
+{
+       struct stat stat;
+       struct parser_found_file *found_file;
+       const struct parser_found_file *entry;
+
+       if (parser_stat_path(ctx, dev, filename, &stat)) {
+               pb_debug("%s: Not found: '%s'\n", __func__, filename);
+               return false;
+       }
+
+       list_for_each_entry(found_list, entry, list) {
+               if (entry->ino == stat.st_ino) {
+                       pb_log("%s: Duplicate: '%s' = '%s'\n",
+                               __func__, filename, entry->filename);
+                       return false;
+               }
+       }
+
+       pb_debug("%s: Found:     '%s'\n", __func__, filename);
+
+       found_file = talloc_zero(found_list, struct parser_found_file);
+       found_file->filename = talloc_strdup(found_file, filename);
+       found_file->ino = stat.st_ino;
+       list_add(found_list, &found_file->list);
+
+       return true;
+}
+
+int parser_replace_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char *buf, int len)
+{
+       bool release;
+       char *path;
+       int rc;
+
+       if (!dev->mounted)
+               return -1;
+
+       rc = device_request_write(dev, &release);
+       if (rc) {
+               pb_log("Can't write file %s: device doesn't allow write\n",
+                               dev->device_path);
+               return -1;
+       }
+
+       path = local_path(ctx, dev, filename);
+
+       rc = replace_file(path, buf, len);
+
+       talloc_free(path);
+
+       device_release_write(dev, release);
+
+       return rc;
+}
+
+int parser_request_url(struct discover_context *ctx, struct pb_url *url,
+               char **buf, int *len)
+{
+       struct load_url_result *result;
+       int rc;
+
+       result = load_url(ctx, url);
+       if (!result)
+               goto out;
+
+       rc = read_file(ctx, result->local, buf, len);
+       if (rc) {
+               pb_log("Read failed for the parser %s on file %s\n",
+                               ctx->parser->name, result->local);
+               goto out_clean;
+       }
+
+       return 0;
+
+out_clean:
+       if (result->cleanup_local)
+               unlink(result->local);
+out:
+       return -1;
+}
+
+int parser_scandir(struct discover_context *ctx, const char *dirname,
+                  struct dirent ***files, int (*filter)(const struct dirent *),
+                  int (*comp)(const struct dirent **, const struct dirent **))
+{
+       char *path;
+       int n;
+
+       path = talloc_asprintf(ctx, "%s%s", ctx->device->mount_path, dirname);
+       if (!path)
+               return -1;
+
+       n = scandir(path, files, filter, comp);
+       talloc_free(path);
+       return n;
+}
+
 void iterate_parsers(struct discover_context *ctx)
 {
-       int i;
+       struct p_item* i;
 
-       pb_log("trying parsers for %s\n", ctx->device_path);
+       pb_log("trying parsers for %s\n", ctx->device->device->id);
 
-       for (i = 0; parsers[i]; i++) {
-               pb_log("\ttrying parser '%s'\n", parsers[i]->name);
-               /* just use a dummy device path for now */
-               if (parsers[i]->parse(ctx))
-                       return;
+       list_for_each_entry(&parsers, i, list) {
+               pb_debug("\ttrying parser '%s'\n", i->parser->name);
+               ctx->parser = i->parser;
+               i->parser->parse(ctx);
        }
-       pb_log("\tno boot_options found\n");
+       ctx->parser = NULL;
+}
+
+static void *parsers_ctx;
+
+void __register_parser(struct parser *parser)
+{
+       struct p_item *i;
+
+       if (!parsers_ctx)
+               parsers_ctx = talloc_new(NULL);
+
+       i = talloc(parsers_ctx, struct p_item);
+       i->parser = parser;
+       list_add(&parsers, &i->list);
+}
+
+static __attribute__((destructor)) void cleanup_parsers(void)
+{
+       talloc_free(parsers_ctx);
+}
+
+void parser_init(void)
+{
 }