From 2c80b79f9856e08a62d7648f72bbb8eb847e7a09 Mon Sep 17 00:00:00 2001
From: Fabian Keil <fk@fabiankeil.de>
Date: Thu, 4 Nov 2021 16:35:00 +0100
Subject: [PATCH 262/325] geli: Implement search command

---
 lib/geom/eli/geom_eli.c | 88 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/lib/geom/eli/geom_eli.c b/lib/geom/eli/geom_eli.c
index bd1c60c40c96..a966ce6c0d70 100644
--- a/lib/geom/eli/geom_eli.c
+++ b/lib/geom/eli/geom_eli.c
@@ -84,6 +84,7 @@ static void eli_resize(struct gctl_req *req);
 static void eli_version(struct gctl_req *req);
 static void eli_clear(struct gctl_req *req);
 static void eli_dump(struct gctl_req *req);
+static void eli_search(struct gctl_req *req);
 
 static int eli_backup_create(struct gctl_req *req, const char *prov,
     const char *file);
@@ -109,6 +110,7 @@ static int eli_backup_create(struct gctl_req *req, const char *prov,
  * version [prov ...]
  * clear [-v] prov ...
  * dump [-v] prov ...
+ * search [-v] prov ...
  */
 struct g_command class_commands[] = {
 	{ "init", G_FLAG_VERBOSE, eli_main,
@@ -277,6 +279,9 @@ struct g_command class_commands[] = {
 	{ "dump", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS,
 	    "[-v] prov ..."
 	},
+	{ "search", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS,
+	    "[-v] prov ..."
+	},
 	G_CMD_SENTINEL
 };
 
@@ -339,6 +344,8 @@ eli_main(struct gctl_req *req, unsigned int flags)
 		eli_restore(req);
 	else if (strcmp(name, "resize") == 0)
 		eli_resize(req);
+	else if (strcmp(name, "search") == 0)
+		eli_search(req);
 	else if (strcmp(name, "version") == 0)
 		eli_version(req);
 	else if (strcmp(name, "dump") == 0)
@@ -650,6 +657,62 @@ eli_metadata_read(struct gctl_req *req, const char *prov,
 	return (0);
 }
 
+static int
+eli_metadata_search(struct gctl_req *req, const char *prov,
+    struct g_eli_metadata *md)
+{
+	unsigned char sector[sizeof(struct g_eli_metadata)];
+	int error;
+
+	if (g_get_sectorsize(prov) == 0) {
+		int fd;
+
+		/* This is a file probably. */
+		fd = open(prov, O_RDONLY);
+		if (fd == -1) {
+			gctl_error(req, "Cannot open %s: %s.", prov,
+			    strerror(errno));
+			return (-1);
+		}
+		if (read(fd, sector, sizeof(sector)) != sizeof(sector)) {
+			gctl_error(req, "Cannot read metadata from %s: %s.",
+			    prov, strerror(errno));
+			close(fd);
+			return (-1);
+		}
+		close(fd);
+	} else {
+		/* This is a GEOM provider. */
+		error = g_metadata_search(prov, sector, sizeof(sector),
+		    G_ELI_MAGIC);
+		if (error != 0) {
+			gctl_error(req, "Cannot read metadata from %s: %s.",
+			    prov, strerror(error));
+			return (-1);
+		}
+	}
+	error = eli_metadata_decode(sector, md);
+	switch (error) {
+	case 0:
+		break;
+	case EOPNOTSUPP:
+		gctl_error(req,
+		    "Provider's %s metadata version %u is too new.\n"
+		    "geli: The highest supported version is %u.",
+		    prov, (unsigned int)md->md_version, G_ELI_VERSION);
+		return (-1);
+	case EINVAL:
+		gctl_error(req, "Inconsistent provider's %s metadata.", prov);
+		return (-1);
+	default:
+		gctl_error(req,
+		    "Unexpected error while decoding provider's %s metadata: %s.",
+		    prov, strerror(error));
+		return (-1);
+	}
+	return (0);
+}
+
 static int
 eli_metadata_store(struct gctl_req *req, const char *prov,
     struct g_eli_metadata *md)
@@ -1988,3 +2051,28 @@ eli_dump(struct gctl_req *req)
 		printf("\n");
 	}
 }
+
+static void
+eli_search(struct gctl_req *req)
+{
+	struct g_eli_metadata md;
+	const char *name;
+	int i, nargs;
+
+	nargs = gctl_get_int(req, "nargs");
+	if (nargs < 1) {
+		gctl_error(req, "Too few arguments.");
+		return;
+	}
+
+	for (i = 0; i < nargs; i++) {
+		name = gctl_get_ascii(req, "arg%d", i);
+		if (eli_metadata_search(NULL, name, &md) == -1) {
+			gctl_error(req, "Not fully done.");
+			continue;
+		}
+		printf("Metadata found on %s:\n", name);
+		eli_metadata_dump(&md);
+		printf("\n");
+	}
+}
-- 
2.32.0