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Diffstat (limited to 'src/libsystemd/sd-bus/bus-internal.c')
-rw-r--r--src/libsystemd/sd-bus/bus-internal.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/src/libsystemd/sd-bus/bus-internal.c b/src/libsystemd/sd-bus/bus-internal.c
index 91b288cd25..37793e48ed 100644
--- a/src/libsystemd/sd-bus/bus-internal.c
+++ b/src/libsystemd/sd-bus/bus-internal.c
@@ -211,6 +211,17 @@ bool member_name_is_valid(const char *p) {
return true;
}
+/*
+ * Complex pattern match
+ * This checks whether @a is a 'complex-prefix' of @b, or @b is a
+ * 'complex-prefix' of @a, based on strings that consist of labels with @c as
+ * spearator. This function returns true if:
+ * - both strings are equal
+ * - either is a prefix of the other and ends with @c
+ * The second rule makes sure that either string needs to be fully included in
+ * the other, and the string which is considered the prefix needs to end with a
+ * separator.
+ */
static bool complex_pattern_check(char c, const char *a, const char *b) {
bool separator = false;
@@ -222,9 +233,7 @@ static bool complex_pattern_check(char c, const char *a, const char *b) {
for (;;) {
if (*a != *b)
- return (separator && (*a == 0 || *b == 0)) ||
- (*a == 0 && *b == c && b[1] == 0) ||
- (*b == 0 && *a == c && a[1] == 0);
+ return (separator && (*a == 0 || *b == 0));
if (*a == 0)
return true;
@@ -243,7 +252,18 @@ bool path_complex_pattern(const char *pattern, const char *value) {
return complex_pattern_check('/', pattern, value);
}
+/*
+ * Simple pattern match
+ * This checks whether @a is a 'simple-prefix' of @b, based on strings that
+ * consist of labels with @c as separator. This function returns true, if:
+ * - if @a and @b are equal
+ * - if @a is a prefix of @b, and the first following character in @b (or the
+ * last character in @a) is @c
+ * The second rule basically makes sure that if @a is a prefix of @b, then @b
+ * must follow with a new label separated by @c. It cannot extend the label.
+ */
static bool simple_pattern_check(char c, const char *a, const char *b) {
+ bool separator = false;
if (!a && !b)
return true;
@@ -253,11 +273,13 @@ static bool simple_pattern_check(char c, const char *a, const char *b) {
for (;;) {
if (*a != *b)
- return *a == 0 && *b == c;
+ return *a == 0 && (*b == c || separator);
if (*a == 0)
return true;
+ separator = *a == c;
+
a++, b++;
}
}