Merge pull request #100 from painless-security/milestone/monitoring

[trust_router.git] / mon / mon_resp_decode.c

diff --git a/mon/mon_resp_decode.c b/mon/mon_resp_decode.c
new file mode 100644 (file)
index 0000000..c6ca379
--- /dev/null
+++ b/mon/mon_resp_decode.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2018, JANET(UK)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of JANET(UK) nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#include <talloc.h>
+#include <jansson.h>
+
+#include <mon_internal.h>
+
+/* Monitoring response decoder */
+
+/**
+ * Decode a JSON response
+ *
+ * Expected format:
+ * {
+ *   "code": 0,
+ *   "message": "success",
+ *   "payload": {
+ *     "serial": 12345,
+ *     ...
+ *   }
+ * }
+ *
+ * Caller must free the return value with MON_REQ_free().
+ *
+ * @param mem_ctx talloc context for the returned struct
+ * @param resp_json reference to JSON request object
+ * @return decoded request struct or NULL on failure
+ */
+MON_RESP *mon_resp_decode(TALLOC_CTX *mem_ctx, json_t *resp_json)
+{
+  TALLOC_CTX *tmp_ctx = talloc_new(NULL);
+  MON_RESP *resp = NULL;
+  json_t *jcode = NULL;
+  json_t *jmessage = NULL;
+  json_t *jpayload = NULL;
+
+  if (! json_is_object(resp_json))
+    goto cleanup;
+
+  /* Get the response code, which is an integer */
+  jcode = json_object_get(resp_json, "code");
+  if (! json_is_integer(jcode))
+    goto cleanup;
+
+  /* Get the response message, which is a string */
+  jmessage = json_object_get(resp_json, "message");
+  if (! json_is_string(jmessage))
+    goto cleanup;
+
+  /* Get the payload if we have one */
+  jpayload = json_object_get(resp_json, "payload");
+
+  /* Get a response in the tmp_ctx context. The payload may be null. */
+  resp = mon_resp_new(tmp_ctx,
+                      (MON_RESP_CODE) json_integer_value(jcode),
+                      json_string_value(jmessage),
+                      jpayload);
+  if (resp == NULL)
+    goto cleanup;
+
+  /* Success! Put the request in the caller's talloc context */
+  talloc_steal(mem_ctx, resp);
+
+cleanup:
+  talloc_free(tmp_ctx);
+  if (resp_json)
+    json_decref(resp_json);
+
+  return resp;
+}