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-rw-r--r--src/shared/parse-helpers.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/src/shared/parse-helpers.c b/src/shared/parse-helpers.c
new file mode 100644
index 0000000..22040c9
--- /dev/null
+++ b/src/shared/parse-helpers.c
@@ -0,0 +1,198 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "af-list.h"
+#include "extract-word.h"
+#include "ip-protocol-list.h"
+#include "log.h"
+#include "parse-helpers.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "utf8.h"
+
+int path_simplify_and_warn(
+ char *path,
+ unsigned flag,
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *lvalue) {
+
+ bool fatal = flag & PATH_CHECK_FATAL;
+
+ assert(!FLAGS_SET(flag, PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE));
+
+ if (!utf8_is_valid(path))
+ return log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, path);
+
+ if (flag & (PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)) {
+ bool absolute;
+
+ absolute = path_is_absolute(path);
+
+ if (!absolute && (flag & PATH_CHECK_ABSOLUTE))
+ return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
+ "%s= path is not absolute%s: %s",
+ lvalue, fatal ? "" : ", ignoring", path);
+
+ if (absolute && (flag & PATH_CHECK_RELATIVE))
+ return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
+ "%s= path is absolute%s: %s",
+ lvalue, fatal ? "" : ", ignoring", path);
+ }
+
+ path_simplify_full(path, flag & PATH_KEEP_TRAILING_SLASH ? PATH_SIMPLIFY_KEEP_TRAILING_SLASH : 0);
+
+ if (!path_is_valid(path))
+ return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
+ "%s= path has invalid length (%zu bytes)%s.",
+ lvalue, strlen(path), fatal ? "" : ", ignoring");
+
+ if (!path_is_normalized(path))
+ return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
+ "%s= path is not normalized%s: %s",
+ lvalue, fatal ? "" : ", ignoring", path);
+
+ return 0;
+}
+
+static int parse_af_token(
+ const char *token,
+ int *family,
+ int *ip_protocol,
+ uint16_t *nr_ports,
+ uint16_t *port_min) {
+
+ int af;
+
+ assert(token);
+ assert(family);
+
+ af = af_from_ipv4_ipv6(token);
+ if (af == AF_UNSPEC)
+ return -EINVAL;
+
+ *family = af;
+ return 0;
+}
+
+static int parse_ip_protocol_token(
+ const char *token,
+ int *family,
+ int *ip_protocol,
+ uint16_t *nr_ports,
+ uint16_t *port_min) {
+
+ int proto;
+
+ assert(token);
+ assert(ip_protocol);
+
+ proto = ip_protocol_from_tcp_udp(token);
+ if (proto < 0)
+ return -EINVAL;
+
+ *ip_protocol = proto;
+ return 0;
+}
+
+static int parse_ip_ports_token(
+ const char *token,
+ int *family,
+ int *ip_protocol,
+ uint16_t *nr_ports,
+ uint16_t *port_min) {
+
+ assert(token);
+ assert(nr_ports);
+ assert(port_min);
+
+ if (streq(token, "any"))
+ *nr_ports = *port_min = 0;
+ else {
+ uint16_t mn = 0, mx = 0;
+ int r = parse_ip_port_range(token, &mn, &mx);
+ if (r < 0)
+ return r;
+
+ *nr_ports = mx - mn + 1;
+ *port_min = mn;
+ }
+
+ return 0;
+}
+
+typedef int (*parse_token_f)(
+ const char *,
+ int *,
+ int *,
+ uint16_t *,
+ uint16_t *);
+
+int parse_socket_bind_item(
+ const char *str,
+ int *address_family,
+ int *ip_protocol,
+ uint16_t *nr_ports,
+ uint16_t *port_min) {
+
+ /* Order of token parsers is important. */
+ const parse_token_f parsers[] = {
+ &parse_af_token,
+ &parse_ip_protocol_token,
+ &parse_ip_ports_token,
+ };
+ parse_token_f const *parser_ptr = parsers;
+ int af = AF_UNSPEC, proto = 0, r;
+ uint16_t nr = 0, mn = 0;
+ const char *p = ASSERT_PTR(str);
+
+ assert(address_family);
+ assert(ip_protocol);
+ assert(nr_ports);
+ assert(port_min);
+
+ if (isempty(p))
+ return -EINVAL;
+
+ for (;;) {
+ _cleanup_free_ char *token = NULL;
+
+ r = extract_first_word(&p, &token, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r == 0)
+ break;
+ if (r < 0)
+ return r;
+
+ if (isempty(token))
+ return -EINVAL;
+
+ while (parser_ptr != parsers + ELEMENTSOF(parsers)) {
+ r = (*parser_ptr)(token, &af, &proto, &nr, &mn);
+ if (r == -ENOMEM)
+ return r;
+
+ ++parser_ptr;
+ /* Continue to next token if parsing succeeded,
+ * otherwise apply next parser to the same token.
+ */
+ if (r >= 0)
+ break;
+ }
+ if (parser_ptr == parsers + ELEMENTSOF(parsers))
+ break;
+ }
+
+ /* Failed to parse a token. */
+ if (r < 0)
+ return r;
+
+ /* Parsers applied successfully, but end of the string not reached. */
+ if (p)
+ return -EINVAL;
+
+ *address_family = af;
+ *ip_protocol = proto;
+ *nr_ports = nr;
+ *port_min = mn;
+ return 0;
+}