irmd: Add configuration file support

This adds initial support for configuration files using the C99 TOML
parser (to be installed separately from https://github.com/cktan/tomlc99).

The default location for the IRMd configuration file is
/etc/ouroboros/irmd.conf. This is configurable at build time.
An example file will be installed in the configuration directory with
the name irmd.conf.example.

Config file support can be disabled using the DISABLE_CONFIGFILE build
option.

There were some refactors and changes to the configuration messages
and protobuf files. This works towards consolidation of protobuf C as
an option for more generic handling of serialization/deserialization
of various messages.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 155 insertions, 0 deletions

diff --git a/src/lib/serdes-oep.c b/src/lib/serdes-oep.c
new file mode 100644
index 00000000..cae5c598
--- /dev/null
+++ b/src/lib/serdes-oep.c
@@ -0,0 +1,155 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2023
+ *
+ * Ouroboros Enrollment Protocol - serialization/deserialization
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#define _POSIX_C_SOURCE 200112L
+
+#include <ouroboros/protobuf.h>
+#include <ouroboros/serdes-oep.h>
+
+
+ssize_t enroll_req_ser(buffer_t buf)
+{
+        enroll_req_msg_t * msg;
+        ssize_t            sz;
+
+        msg = enroll_req_s_to_msg();
+        if (msg == NULL)
+                goto fail_msg;
+
+        sz = enroll_req_msg__get_packed_size(msg);
+        if (sz < 0 || (size_t) sz > buf.len)
+                goto fail_pack;
+
+        enroll_req_msg__pack(msg, buf.data);
+
+        enroll_req_msg__free_unpacked(msg, NULL);
+
+        return sz;
+
+ fail_pack:
+    enroll_req_msg__free_unpacked(msg, NULL);
+ fail_msg:
+    return -1;
+}
+
+int enroll_req_des(const buffer_t buf)
+{
+        enroll_req_msg_t * msg;
+
+        msg = enroll_req_msg__unpack(NULL, buf.len, buf.data);
+        if (msg == NULL)
+                return -1;
+
+        /* Nothing in request yet, if it unpacks, it's good. */
+
+        enroll_req_msg__free_unpacked(msg, NULL);
+
+        return 0;
+}
+
+ssize_t enroll_resp_ser(const struct enroll_resp * resp,
+                        buffer_t                   buf)
+{
+        enroll_resp_msg_t * msg;
+        ssize_t             sz;
+
+        msg = enroll_resp_s_to_msg(resp);
+        if (msg == NULL)
+                goto fail_msg;
+
+        sz = enroll_resp_msg__get_packed_size(msg);
+        if (sz < 0 || (size_t) sz > buf.len)
+                goto fail_pack;
+
+        msg->t_sec = resp->t.tv_sec;
+        msg->t_nsec = resp->t.tv_nsec;
+
+        enroll_resp_msg__pack(msg, buf.data);
+
+        enroll_resp_msg__free_unpacked(msg, NULL);
+
+        return sz;
+
+ fail_pack:
+        enroll_resp_msg__free_unpacked(msg, NULL);
+ fail_msg:
+        return -1;
+}
+
+int enroll_resp_des(struct enroll_resp * resp,
+                    const buffer_t       buf)
+{
+        enroll_resp_msg_t * msg;
+
+        msg = enroll_resp_msg__unpack(NULL, buf.len, buf.data);
+        if (msg == NULL)
+                return -1;
+
+        *resp = enroll_resp_msg_to_s(msg);
+
+        enroll_resp_msg__free_unpacked(msg, NULL);
+
+        return 0;
+}
+
+ssize_t enroll_ack_ser(const int response,
+                       buffer_t  buf)
+{
+        enroll_ack_msg_t * msg;
+        ssize_t            sz;
+
+        msg = enroll_ack_s_to_msg(response);
+        if (msg == NULL)
+                goto fail_msg;
+
+        sz = enroll_ack_msg__get_packed_size(msg);
+        if (sz < 0 || (size_t) sz > buf.len)
+                goto fail_pack;
+
+        enroll_ack_msg__pack(msg, buf.data);
+
+        enroll_ack_msg__free_unpacked(msg, NULL);
+
+        return sz;
+
+ fail_pack:
+        enroll_ack_msg__free_unpacked(msg, NULL);
+ fail_msg:
+        return -1;
+
+}
+
+int enroll_ack_des(int *          response,
+                   const buffer_t buf)
+{
+        enroll_ack_msg_t * msg;
+
+        msg = enroll_ack_msg__unpack(NULL, buf.len, buf.data);
+        if (msg == NULL)
+                return -1;
+
+        *response = enroll_ack_msg_to_s(msg);
+
+        enroll_ack_msg__free_unpacked(msg, NULL);
+
+        return 0;
+}
\ No newline at end of file