A corner case of the previous patch are strings starting with a double quote,
such as '"prepended to itself is false" prepended to itself is false' or
'"" is the empty string', and in particular, the string '"' ("\"" in C
notation), which is indistinguishable from the "QUOTE" token in the parsed
strvec.
This patch fixes that by introducing a special token that can't occur as part
of a normal string to indicate the beginning and end of a quoted string.
'"' is admittedly not a very likely keyword value for multipath.conf, but
a) this is a matter of correctness, b) we didn't think of '2.5"' before,
either, and
c) the (*str != '"') expressions would need to be patched anyway to fix the
'string starting with "' case.
Signed-off-by: Martin Wilck <mwi...@suse.com>
---
libmultipath/parser.c | 36 +++++++++++++++++++-----------------
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/libmultipath/parser.c b/libmultipath/parser.c
index 592269a9b5b1..da8de305f680 100644
--- a/libmultipath/parser.c
+++ b/libmultipath/parser.c
@@ -186,6 +186,12 @@ snprint_keyword(char *buff, int len, char *fmt, struct
keyword *kw,
return fwd;
}
+static const char quote_marker[] = { '\0', '"', '\0' };
+static bool is_quote(const char* token)
+{
+ return !memcmp(token, quote_marker, sizeof(quote_marker));
+}
+
vector
alloc_strvec(char *string)
{
@@ -225,17 +231,13 @@ alloc_strvec(char *string)
start = cp;
if (!in_string && *cp == '"') {
cp++;
- token = MALLOC(2);
+ token = MALLOC(sizeof(quote_marker));
if (!token)
goto out;
- *(token) = '"';
- *(token + 1) = '\0';
- if (in_string)
- in_string = 0;
- else
- in_string = 1;
+ memcpy(token, quote_marker, sizeof(quote_marker));
+ in_string = 1;
} else if (!in_string && (*cp == '{' || *cp == '}')) {
token = MALLOC(2);
@@ -324,13 +326,13 @@ set_value(vector strvec)
(char *)VECTOR_SLOT(strvec, 0));
return NULL;
}
- size = strlen(str);
- if (size == 0) {
- condlog(0, "option '%s' has empty value",
- (char *)VECTOR_SLOT(strvec, 0));
- return NULL;
- }
- if (*str != '"') {
+ if (!is_quote(str)) {
+ size = strlen(str);
+ if (size == 0) {
+ condlog(0, "option '%s' has empty value",
+ (char *)VECTOR_SLOT(strvec, 0));
+ return NULL;
+ }
alloc = MALLOC(sizeof (char) * (size + 1));
if (alloc)
memcpy(alloc, str, size);
@@ -354,7 +356,7 @@ set_value(vector strvec)
(char *)VECTOR_SLOT(strvec, 0));
return NULL;
}
- if (*str == '"')
+ if (is_quote(str))
break;
tmp = alloc;
/* The first +1 is for the NULL byte. The rest are for the
@@ -460,7 +462,7 @@ validate_config_strvec(vector strvec, char *file)
(char *)VECTOR_SLOT(strvec, 0), line_nr, file);
return -1;
}
- if (*str != '"') {
+ if (!is_quote(str)) {
if (VECTOR_SIZE(strvec) > 2)
condlog(0, "ignoring extra data starting with '%s' on
line %d of %s", (char *)VECTOR_SLOT(strvec, 2), line_nr, file);
return 0;
@@ -472,7 +474,7 @@ validate_config_strvec(vector strvec, char *file)
line_nr, file);
return -1;
}
- if (*str == '"') {
+ if (is_quote(str)) {
if (VECTOR_SIZE(strvec) > i + 1)
condlog(0, "ignoring extra data starting with
'%s' on line %d of %s", (char *)VECTOR_SLOT(strvec, (i + 1)), line_nr, file);
return 0;
--
2.16.1
--
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