1 files changed, 72 insertions, 0 deletions
diff --git a/src/machid.c b/src/machid.c
new file mode 100644
index 0000000..721a4ee
--- /dev/null
+++ b/src/machid.c
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <fcntl.h>
+#include <liburing.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <iou.h>
+#include <thunk.h>
+
+#include "machid.h"
+#include "readfile.h"
+
+/* Implements iou-based machine-id retrieval.
+ *
+ * this is basically copy & paste from bootid.c,
+ * which suggests this should just be readfile.c
+ */
+
+
+#define MACHID_PATH "/etc/machine-id"
+
+
+/* call user-supplied closure now that buf is populated */
+THUNK_DEFINE_STATIC(have_machid, iou_t *, iou, char *, buf, size_t *, size, char **, res_ptr, thunk_t *, closure)
+{
+	assert(iou);
+	assert(closure);
+
+	/* FIXME: I'm just assuming it's a proper nl-terminated machid for now, null terminate it */
+	buf[*size - 1] = '\0';
+
+	*res_ptr = strdup(buf);
+	if (!*res_ptr)
+		return -ENOMEM;
+
+	return thunk_dispatch(closure);
+}
+
+
+/* get a machid via iou, scheduling closure once gotten */
+/* returns < 0 on error, 0 on successful queueing of operation */
+THUNK_DEFINE(machid_get, iou_t *, iou, char **, res_ptr, thunk_t *, closure)
+{
+	thunk_t	*machid_thunk;
+	struct {
+		char	buf[4096];
+		size_t	len;
+	}	*buf;
+
+	machid_thunk = THUNK_ALLOC(have_machid, (void **)&buf, sizeof(*buf));
+	buf->len = sizeof(buf->buf);
+	THUNK_INIT(have_machid(machid_thunk, iou, buf->buf, &buf->len, res_ptr, closure));
+
+	return readfile(iou, MACHID_PATH, buf->buf, &buf->len, machid_thunk);
+}