From d28ccd0b91881ad8e52ed66e36c2db644a6990bf Mon Sep 17 00:00:00 2001
From: Hailong Wang <whlsxl@gmail.com>
Date: Wed, 13 Apr 2022 21:14:08 +0800
Subject: [PATCH] fix #37  if /etc/machine-id is empty

---
 wsd.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/wsd.c b/wsd.c
index 607f26d..0a363d8 100644
--- a/wsd.c
+++ b/wsd.c
@@ -78,8 +78,11 @@ static void set_seed(void)
 
 	time((time_t *)&seed);
 
-	if (fp) {
+	fseek(fp, 0, SEEK_END);
+
+	if (fp && 0 != ftell(fp) ) {
 		unsigned long s;
+		rewind(fp);
 
 		while (fscanf(fp, "%8lx", &s) > 0)
 			seed ^= s;
@@ -113,10 +116,19 @@ static void uuid_endpoint(char uuid[UUIDLEN])
 
 	if (!fp) {
 		fp = fopen("/proc/sys/kernel/random/boot_id", "r");
+	} else {
+		fseek(fp, 0, SEEK_END);
+		long size = ftell(fp);
+		if (33 != size) {
+			fclose(fp);
+			fp = fopen("/proc/sys/kernel/random/boot_id", "r");
+		} else {
+			rewind(fp);
+		}
 	}
 
 	if (!fp) {
-		DEBUG(0, W, "Can't open required '/etc/machine-id' or '/proc/sys/kernel/random/boot_id'");
+		DEBUG(0, W, "Can't open or file empty, required '/etc/machine-id' or '/proc/sys/kernel/random/boot_id'");
 		return;
 	}