1 files changed, 84 insertions, 0 deletions
diff --git a/src/shared/ip-protocol-list.c b/src/shared/ip-protocol-list.c
new file mode 100644
index 0000000..14155b6
--- /dev/null
+++ b/src/shared/ip-protocol-list.c
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <netinet/in.h>
+
+#include "alloc-util.h"
+#include "ip-protocol-list.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "string-util.h"
+
+static const struct ip_protocol_name* lookup_ip_protocol(register const char *str, register GPERF_LEN_TYPE len);
+
+#include "ip-protocol-from-name.h"
+#include "ip-protocol-to-name.h"
+
+const char *ip_protocol_to_name(int id) {
+
+        if (id < 0)
+                return NULL;
+
+        if ((size_t) id >= ELEMENTSOF(ip_protocol_names))
+                return NULL;
+
+        return ip_protocol_names[id];
+}
+
+int ip_protocol_from_name(const char *name) {
+        const struct ip_protocol_name *sc;
+
+        assert(name);
+
+        sc = lookup_ip_protocol(name, strlen(name));
+        if (!sc)
+                return -EINVAL;
+
+        return sc->id;
+}
+
+int parse_ip_protocol_full(const char *s, bool relaxed) {
+        int r, p;
+
+        assert(s);
+
+        if (isempty(s))
+                return IPPROTO_IP;
+
+        /* People commonly use lowercase protocol names, which we can look up very quickly, so let's try that
+         * first. */
+        r = ip_protocol_from_name(s);
+        if (r >= 0)
+                return r;
+
+        /* Do not use strdupa() here, as the input string may come from command line or config files. */
+        _cleanup_free_ char *t = strdup(s);
+        if (!t)
+                return -ENOMEM;
+
+        r = ip_protocol_from_name(ascii_strlower(t));
+        if (r >= 0)
+                return r;
+
+        r = safe_atoi(t, &p);
+        if (r < 0)
+                return r;
+        if (p < 0)
+                return -ERANGE;
+
+        /* If @relaxed, we don't check that we have a name for the protocol. */
+        if (!relaxed && !ip_protocol_to_name(p))
+                return -EPROTONOSUPPORT;
+
+        return p;
+}
+
+const char *ip_protocol_to_tcp_udp(int id) {
+        return IN_SET(id, IPPROTO_TCP, IPPROTO_UDP) ?
+                ip_protocol_to_name(id) : NULL;
+}
+
+int ip_protocol_from_tcp_udp(const char *ip_protocol) {
+        int id = ip_protocol_from_name(ip_protocol);
+        return IN_SET(id, IPPROTO_TCP, IPPROTO_UDP) ? id : -EINVAL;
+}