*result = tmp;
return 1;
}
+
+/**
+ * Split string and return pointers to its parts.
+ *
+ * \param args The string to be split.
+ * \param argv_ptr Pointer to the list of substrings.
+ * \param delim Delimiter.
+ *
+ * This function modifies \a args by replacing each occurance of \a delim by
+ * zero. A \p NULL-terminated array of pointers to char* is allocated dynamically
+ * and these pointers are initialized to point to the broken-up substrings
+ * within \a args. A pointer to this array is returned via \a argv_ptr.
+ *
+ * \return The number of substrings found in \a args.
+ */
+__must_check unsigned split_args(char *args, char *** const argv_ptr, const char *delim)
+{
+ char *p = args;
+ char **argv;
+ size_t n = 0, i, j;
+
+ p = args + strspn(args, delim);
+ for (;;) {
+ i = strcspn(p, delim);
+ if (!i)
+ break;
+ p += i;
+ n++;
+ p += strspn(p, delim);
+ }
+ *argv_ptr = adu_malloc((n + 1) * sizeof(char *));
+ argv = *argv_ptr;
+ i = 0;
+ p = args + strspn(args, delim);
+ while (p) {
+ argv[i] = p;
+ j = strcspn(p, delim);
+ if (!j)
+ break;
+ p += strcspn(p, delim);
+ if (*p) {
+ *p = '\0';
+ p++;
+ p += strspn(p, delim);
+ }
+ i++;
+ }
+ argv[n] = NULL;
+ return n;
+}
+
+static int check_uid_arg(const char *arg, uint32_t *uid)
+{
+ const uint32_t max = ~0U;
+ /*
+ * we need an 64-bit int for string -> uid conversion because strtoll()
+ * returns a signed value.
+ */
+ int64_t val;
+ int ret = atoi64(arg, &val);
+
+ if (ret < 0)
+ return ret;
+ if (val < 0 || val > max)
+ return -ERRNO_TO_ERROR(EINVAL);
+ *uid = val;
+ return 1;
+}
+
+int parse_uid_range(const char *orig_arg, struct uid_range *ur)
+{
+ int ret;
+ char *arg = adu_strdup(orig_arg), *p = strchr(arg, '-');
+
+ if (!p || p == arg) { /* -42 or 42 */
+ ret = check_uid_arg(p? p + 1 : arg, &ur->high);
+ if (ret < 0)
+ goto out;
+ ur->low = p? 0 : ur->high;
+ ret = 1;
+ goto out;
+ }
+ /* 42- or 42-4711 */
+ *p = '\0';
+ p++;
+ ret = check_uid_arg(arg, &ur->low);
+ if (ret < 0)
+ goto out;
+ ur->high = ~0U;
+ if (*p) { /* 42-4711 */
+ ret = check_uid_arg(p, &ur->high);
+ if (ret < 0)
+ goto out;
+ }
+ if (ur->low > ur->high)
+ ret = -ERRNO_TO_ERROR(EINVAL);
+out:
+ if (ret < 0)
+ ERROR_LOG("bad uid option: %s\n", orig_arg);
+ else
+ INFO_LOG("admissible uid range: %u - %u\n", ur->low,
+ ur->high);
+ free(arg);
+ return ret;
+}
+
+int parse_uid_arg(const char *orig_arg, struct uid_range **ur)
+{
+ char *arg, **argv;
+ unsigned n;
+ int i, ret = 1;
+
+ if (!orig_arg)
+ return 0;
+ arg = adu_strdup(orig_arg);
+ n = split_args(arg, &argv, ",");
+ if (!n)
+ return -E_SYNTAX;
+ *ur = adu_malloc((n + 1) * sizeof(struct uid_range));
+ for (i = 0; i < n; i++) {
+ ret = parse_uid_range(argv[i], *ur + i);
+ if (ret < 0)
+ break;
+ }
+ free(arg);
+ if (ret < 0) {
+ free(*ur);
+ *ur = NULL;
+ }
+ /* an empty range indicates the end of the list */
+ (*ur)[n].low = 1;
+ (*ur)[n].high = 0;
+ return n;
+}