parsers: change parser.parse to accept a buffer
[petitboot] / discover / parser.c
index 5f4e5149557678c6e0c34c59c02a42f5b5b46317..1f3674d3ee461cc24fac0f9ca5a8fc11d765fb1c 100644 (file)
@@ -1,12 +1,17 @@
 
+#include <fcntl.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 
 #include "types/types.h"
 #include <log/log.h>
+#include <talloc/talloc.h>
 
 #include "device-handler.h"
 #include "parser.h"
 #include "parser-utils.h"
+#include "paths.h"
 
 struct parser __grub2_parser;
 struct parser __kboot_parser;
@@ -21,19 +26,103 @@ static const struct parser *const parsers[] = {
        NULL
 };
 
+static const int max_file_size = 1024 * 1024;
+
+static int read_file(struct discover_context *ctx,
+               const char *filename, char **bufp, int *lenp)
+{
+       struct stat statbuf;
+       int rc, fd, i, len;
+       char *buf;
+
+       fd = open(filename, O_RDONLY);
+       if (fd < 0)
+               return -1;
+
+       rc = fstat(fd, &statbuf);
+       if (rc < 0)
+               goto err_close;
+
+       len = statbuf.st_size;
+       if (len > max_file_size)
+               goto err_close;
+
+       buf = talloc_array(ctx, char, len);
+       if (!buf)
+               goto err_close;
+
+       for (i = 0; i < len; i += rc) {
+               rc = read(fd, buf + i, len - i);
+
+               /* unexpected EOF: trim and return */
+               if (rc == 0) {
+                       len = i;
+                       break;
+               }
+
+               if (rc < 0)
+                       goto err_free;
+
+       }
+
+       close(fd);
+       *bufp = buf;
+       *lenp = len;
+       return 0;
+
+err_free:
+       talloc_free(buf);
+err_close:
+       close(fd);
+       return -1;
+}
+
+static void iterate_parser_files(struct discover_context *ctx,
+               const struct parser *parser)
+{
+       const char * const *filename;
+       const char *path, *url;
+       unsigned int tempfile;
+
+       if (!parser->filenames)
+               return;
+
+       for (filename = parser->filenames; *filename; filename++) {
+               int rc, len;
+               char *buf;
+
+               url = resolve_path(ctx, *filename, ctx->device->device_path);
+               if (!url)
+                       continue;
+
+               path = load_file(ctx, url, &tempfile);
+
+               if (!path)
+                       continue;
+
+               rc = read_file(ctx, path, &buf, &len);
+               if (!rc) {
+                       parser->parse(ctx, buf, len);
+                       talloc_free(buf);
+               }
+
+               if (tempfile)
+                       unlink(path);
+
+       }
+
+}
+
 void iterate_parsers(struct discover_context *ctx)
 {
        int i;
-       unsigned int count = 0;
 
        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);
-               count += parsers[i]->parse(ctx);
+               iterate_parser_files(ctx, parsers[i]);
        }
-       if (!count)
-               pb_log("\tno boot_options found\n");
 }
 
 void parser_init(void)