X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fparser.c;h=8d4c180c2c1bccc7a3a43f1da996c09f5b901f65;hp=2b4ddd2668e0e30a808184c004c0aac879b0e938;hb=7c8683fa009115f8a3b08b7a7666b64ebcbbc1bc;hpb=dae4540e417e2bf72dd83b2713a670bde0056ba9

diff --git a/discover/parser.c b/discover/parser.c
index 2b4ddd2..8d4c180 100644
--- a/discover/parser.c
+++ b/discover/parser.c
@@ -1,46 +1,178 @@
 
+#include <fcntl.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 
-#include "pb-protocol/pb-protocol.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"
 
-extern struct parser __start_parsers[], __stop_parsers[];
+static int n_parsers;
+static struct parser **parsers;
 
-void iterate_parsers(struct discover_context *ctx)
+static const int max_file_size = 1024 * 1024;
+
+static int read_file(struct discover_context *ctx,
+		const char *filename, char **bufp, int *lenp)
 {
-	struct parser *parser;
+	struct stat statbuf;
+	int rc, fd, i, len;
+	char *buf;
 
-	pb_log("trying parsers for %s\n", ctx->device_path);
+	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 + 1);
+	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;
 
-	for (parser = __start_parsers; parser < __stop_parsers; parser++) {
-		pb_log("\ttrying parser '%s'\n", parser->name);
-		/* just use a dummy device path for now */
-		if (parser->parse(ctx))
-			return;
 	}
-	pb_log("\tno boot_options found\n");
+
+	buf[len] = '\0';
+
+	close(fd);
+	*bufp = buf;
+	*lenp = len;
+	return 0;
+
+err_free:
+	talloc_free(buf);
+err_close:
+	close(fd);
+	return -1;
+}
+
+static char *local_path(struct discover_context *ctx,
+		const char *filename)
+{
+	return join_paths(ctx, ctx->device->mount_path, filename);
 }
 
-static int compare_parsers(const void *a, const void *b)
+static int download_config(struct discover_context *ctx, char **buf, int *len)
 {
-	const struct parser *parser_a = a, *parser_b = b;
+	unsigned tempfile;
+	const char *file;
+	int rc;
 
-	if (parser_a->priority > parser_b->priority)
+	file = load_url(ctx, ctx->conf_url, &tempfile);
+	if (!file)
 		return -1;
 
-	if (parser_a->priority < parser_b->priority)
-		return 1;
+	rc = read_file(ctx, file, buf, len);
+	if (rc)
+		goto out_clean;
 
 	return 0;
+
+out_clean:
+	if (tempfile)
+		unlink(file);
+	return -1;
+}
+
+static void iterate_parser_files(struct discover_context *ctx,
+		const struct parser *parser)
+{
+	const char * const *filename;
+	const char *path;
+
+	if (!parser->filenames)
+		return;
+
+	for (filename = parser->filenames; *filename; filename++) {
+		int rc, len;
+		char *buf;
+
+		path = local_path(ctx, *filename);
+		if (!path)
+			continue;
+
+		rc = read_file(ctx, path, &buf, &len);
+		if (!rc) {
+			parser->parse(ctx, buf, len);
+			talloc_free(buf);
+		}
+	}
+}
+
+void iterate_parsers(struct discover_context *ctx, enum conf_method method)
+{
+	int rc, i, len;
+	char *buf;
+
+	pb_log("trying parsers for %s\n", ctx->device->device->id);
+
+	switch (method) {
+	case CONF_METHOD_LOCAL_FILE:
+		for (i = 0; i < n_parsers; i++) {
+			if (parsers[i]->method != CONF_METHOD_LOCAL_FILE)
+				continue;
+
+			pb_log("\ttrying parser '%s'\n", parsers[i]->name);
+			ctx->parser = parsers[i];
+			iterate_parser_files(ctx, ctx->parser);
+		}
+		ctx->parser = NULL;
+		break;
+
+	case CONF_METHOD_DHCP:
+		rc = download_config(ctx, &buf, &len);
+		if (rc) {
+			pb_log("\tdownload failed, aborting\n");
+			return;
+		}
+
+		for (i = 0; i < n_parsers; i++) {
+			if (parsers[i]->method != method)
+				continue;
+
+			pb_log("\ttrying parser '%s'\n", parsers[i]->name);
+			ctx->parser = parsers[i];
+			parsers[i]->parse(ctx, buf, len);
+		}
+
+		break;
+
+	case CONF_METHOD_UNKNOWN:
+		break;
+
+	}
+}
+
+void __register_parser(struct parser *parser)
+{
+	parsers = talloc_realloc(NULL, parsers, struct parser *, n_parsers + 1);
+	parsers[n_parsers] = parser;
+	n_parsers++;
 }
 
 void parser_init(void)
 {
-	/* sort our parsers into descending priority order */
-	qsort(__start_parsers, __stop_parsers - __start_parsers,
-			sizeof(struct parser), compare_parsers);
 }