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parse-util: rewrite parse_uid_range() on top of parse_uid()

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parse_uid() does so many safety checks we want, hence rewrite
parse_uid_range() on top of parse_uid() instead of parse_range().
This commit is contained in:
Lennart Poettering 2020-06-01 17:17:40 +02:00
parent f5979b63cc
commit 60eb1f0728
1 changed files with 22 additions and 5 deletions
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27
src/basic/user-util.c
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@ -74,22 +74,39 @@ int parse_uid(const char *s, uid_t *ret) {
}
int parse_uid_range(const char *s, uid_t *ret_lower, uid_t *ret_upper) {
uint32_t u, l;
_cleanup_free_ char *word = NULL;
uid_t l, u;
int r;
assert(s);
assert(ret_lower);
assert(ret_upper);
r = parse_range(s, &l, &u);
r = extract_first_word(&s, &word, "-", EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return r;
if (r == 0)
return -EINVAL;
r = parse_uid(word, &l);
if (r < 0)
return r;
if (l > u)
/* Check for the upper bound and extract it if needed */
if (!s)
/* Single number with no dash. */
u = l;
else if (!*s)
/* Trailing dash is an error. */
return -EINVAL;
else {
r = parse_uid(s, &u);
if (r < 0)
return r;
if (!uid_is_valid(l) || !uid_is_valid(u))
return -ENXIO;
if (l > u)
return -EINVAL;
}
*ret_lower = l;
*ret_upper = u;