resolve: add more record types and convert to gperf table

We are unlikely to evert support most of them, but we can at least
display the types properly.

The list is taken from the IANA list.

The table of number->name mappings is converted to a switch
statement. gcc does a nice job of optimizing lookup (when optimization
is enabled).

systemd-resolve-host -t is now case insensitive.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c
new file mode 100644
index 0000000000..271a7e176b
--- /dev/null
+++ b/src/resolve/dns-type.c
@@ -0,0 +1,47 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Zbigniew Jędrzejewski-Szmek
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "dns-type.h"
+
+typedef const struct {
+        uint16_t type;
+        const char *name;
+} dns_type;
+
+static const struct dns_type_name *
+lookup_dns_type (register const char *str, register unsigned int len);
+
+#include "dns_type-from-name.h"
+#include "dns_type-to-name.h"
+
+int dns_type_from_string(const char *s, uint16_t *type) {
+        const struct dns_type_name *sc;
+
+        assert(s);
+        assert(type);
+
+        sc = lookup_dns_type(s, strlen(s));
+        if (!sc)
+                return -EINVAL;
+
+        *type = sc->id;
+        return 0;
+}