From a6fd611c354ba62320661ad4eef4dd822423fcb6 Mon Sep 17 00:00:00 2001
From: gaohuatao <gaohuatao@huawei.com>
Date: Wed, 1 Apr 2020 06:53:27 -0400
Subject: [PATCH 141/142] lxc: decode some escape charactors of lxc config file
 string

Signed-off-by: gaohuatao <gaohuatao@huawei.com>
---
 src/lxc/confile.c | 55 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

diff --git a/src/lxc/confile.c b/src/lxc/confile.c
index 3eaae4a9..747ccec7 100644
--- a/src/lxc/confile.c
+++ b/src/lxc/confile.c
@@ -2443,6 +2443,52 @@ struct parse_line_conf {
 	bool from_include;
 };
 
+// escape_string_decode compress some escape characters
+static char *escape_string_decode(const char *src)
+{
+	size_t src_end = 0;
+	size_t dst_end = 0;
+	size_t len = 0;
+	char *dst = NULL;
+	
+	if (src == NULL) {
+		return NULL;
+	}
+
+	len = strlen(src);
+	if (len == 0) {
+		return NULL;
+	}
+	
+	dst = calloc(1, len + 1);
+	if (dst == NULL) {
+		ERROR("Out of memory");
+		return NULL;
+	}
+	
+	while(src_end < len) {
+		if (src[src_end] == '\\') {
+			switch (src[++src_end])
+			{
+				case 'r': dst[dst_end] = '\r'; break;
+				case 'n': dst[dst_end] = '\n'; break;
+				case 'f': dst[dst_end] = '\f'; break;
+				case 'b': dst[dst_end] = '\b'; break;
+				case 't': dst[dst_end] = '\t'; break;
+				case '\\': dst[dst_end] = '\\'; break;
+				// default do not decode
+				default: dst[dst_end++] = '\\'; dst[dst_end] = src[src_end]; break;
+			}
+		} else {
+			dst[dst_end] = src[src_end];	
+		}
+		dst_end++;
+		src_end++;
+	}
+	
+	return dst;
+}
+
 static int parse_line(char *buffer, void *data)
 {
 	char *dot, *key, *line, *linep, *value;
@@ -2451,6 +2497,7 @@ static int parse_line(char *buffer, void *data)
 	int ret = 0;
 	char *dup = buffer;
 	struct parse_line_conf *plc = data;
+	char *value_decode = NULL;
 
 	/* If there are newlines in the config file we should keep them. */
 	empty_line = lxc_is_line_empty(dup);
@@ -2517,11 +2564,15 @@ static int parse_line(char *buffer, void *data)
 		goto on_error;
 	}
 
-	ret = config->set(key, value, plc->conf, NULL);
+	value_decode = escape_string_decode(value);
+	if (value_decode == NULL) {
+		ERROR("Value %s decode failed", value);
+	}
+	ret = config->set(key, value_decode ? value_decode: value, plc->conf, NULL);
 
 on_error:
 	free(linep);
-
+	free(value_decode);
 	return ret;
 }
 
-- 
2.19.1