fix(rc): rework remote configuration handling

.circleci/config.yml

@@ -240,6 +240,10 @@ jobs:
           description: Run Base64 fuzzer
           command: timeout 5m ./.build/fuzz/base64/base64-fuzz
           duration: 5m
+      - run_timeout: 
+          description: Run Remote Configuration fuzzer
+          command: timeout 5m ./.build/fuzz/remote-configuration/remote-config-fuzz
+          duration: 5m
 
 workflows:
   pull-request:

fuzz/remote-configuration/CMakeLists.txt

@@ -0,0 +1,13 @@
+add_executable(remote-config-fuzz main.cpp)
+
+add_dependencies(remote-config-fuzz dd_trace_cpp-static)
+
+target_include_directories(remote-config-fuzz
+  PRIVATE
+    ${CMAKE_SOURCE_DIR}/src
+    ${CMAKE_SOURCE_DIR}/src/datadog
+)
+
+target_link_libraries(remote-config-fuzz dd_trace_cpp-static)
+
+add_target_to_group(remote-config-fuzz dd_trace_cpp-fuzzers)

fuzz/remote-configuration/corpus/input1.json

@@ -0,0 +1 @@
+{}

fuzz/remote-configuration/corpus/input10.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"],
+    "target_files": 15
+}

fuzz/remote-configuration/corpus/input11.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"],
+    "target_files": [{"path": "employee/APM_TRACING/valid_conf_path/config", "raw": "Hello, Uranus!"}]
+}

fuzz/remote-configuration/corpus/input12.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"],
+    "target_files": [{"path": "employee/APM_TRACING/valid_conf_path/config", "raw": "bm90IGpzb24="}]
+}

fuzz/remote-configuration/corpus/input13.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"],
+    "target_files": [{"path": "employee/APM_TRACING/valid_conf_path/config", "raw": "eyJmb28iOiAiYmFyIn0="}]
+}

fuzz/remote-configuration/corpus/input14.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["foo"],
+    "target_files": [{"path": "foo", "raw": "eyJmb28iOiAiYmFyIn0="}]
+}

fuzz/remote-configuration/corpus/input15.json

@@ -0,0 +1,22 @@
+{
+    "targets": "ewogICAgInNpZ25lZCI6IHsKICAgICAgICAiY3VzdG9tIjogewogICAgICAgICAgICAiYWdlbnRfcmVmcmVzaF9pbnRlcnZhbCI6IDUsCiAgICAgICAgICAgICJvcGFxdWVfYmFja2VuZF9zdGF0ZSI6ICJleUoyWlhKemFXOXVJam95TENKemRHRjBaU0k2ZXlKbWFXeGxYMmhoYzJobGN5STZleUprWVhSaFpHOW5MekV3TURBeE1qVTROREF2UVZCTlgxUlNRVU5KVGtjdk9ESTNaV0ZqWmpoa1ltTXpZV0l4TkRNMFpETXlNV05pT0RGa1ptSm1OMkZtWlRZMU5HRTBZall4TVRGalpqRTJOakJpTnpGalkyWTRPVGM0TVRrek9DOHlPVEE0Tm1Ka1ltVTFNRFpsTmpoaU5UQm1NekExTlRneU0yRXpaR0UxWTJVd05USTRaakUyTkRCa05USmpaamc0TmpFNE1UWmhZV0U1Wm1ObFlXWTBJanBiSW05WVpESnBlVU16ZUM5b1JXc3hlWFZoWTFoR04xbHFjWEpwVGs5QldVdHVaekZ0V0UwMU5WWktUSGM5SWwxOWZYMD0iCiAgICAgICAgfSwKICAgICAgICAic3BlY192ZXJzaW9uIjogIjEuMC4wIiwKICAgICAgICAidGFyZ2V0cyI6IHsKICAgICAgICAgICAgImVtcGxveWVlL0FQTV9UUkFDSU5HL3Rlc3RfcmNfdXBkYXRlL2xpYl91cGRhdGUiOiB7CiAgICAgICAgICAgICAgICAiaGFzaGVzIjogewogICAgICAgICAgICAgICAgICAgICJzaGEyNTYiOiAiYTE3Nzc2OGIyMGI3YzdmODQ0OTM1Y2FlNjljNWM1ZWQ4OGVhYWUyMzRlMDE4MmE3ODM1OTk3MzM5ZTU1MjRiYyIKICAgICAgICAgICAgICAgIH0sCiAgICAgICAgICAgICAgICAibGVuZ3RoIjogMzc0LAoJCQkJImN1c3RvbSI6IHsgInYiOiAxMjQgfQogICAgICAgICAgICB9LAogICAgICAgICAgICAiZW1wbG95ZWUvQUdFTlRfVEFTSy90ZXN0X3JjX3VwZGF0ZS9mbGFyZV90YXNrIjogewogICAgICAgICAgICAgICAgImhhc2hlcyI6IHsKICAgICAgICAgICAgICAgICAgICAic2hhMjU2IjogIjQxOTRjZTZmNzExMzk1OTQ2YmU4MzdiZjVlYmE5NDg5MWI3YmRlNzk4OTExZWQ1ZWZmZjY1OTlkMjFhYjk2OTYiCiAgICAgICAgICAgICAgICB9LAogICAgICAgICAgICAgICAgImxlbmd0aCI6IDM3NCwKCQkJCSJjdXN0b20iOiB7ICJ2IjogMTI1IH0KICAgICAgICAgICAgfSwKICAgICAgICAgICAgImVtcGxveWVlL0FHRU5UX0NPTkZJRy90ZXN0X3JjX3VwZGF0ZS9mbGFyZV9jb25mIjogewogICAgICAgICAgICAgICAgImhhc2hlcyI6IHsKICAgICAgICAgICAgICAgICAgICAic2hhMjU2IjogIjJkNzhhZTczNmEzZmM0NTViNzIzMWRhZjk5NDVmOGRmNzA0ZjE3MjViNTBkZGU0NmQwY2JjZGMzZjBlMTFkNDEiCiAgICAgICAgICAgICAgICB9LAogICAgICAgICAgICAgICAgImxlbmd0aCI6IDM3NCwKCQkJCSJjdXN0b20iOiB7ICJ2IjogMTI1IH0KICAgICAgICAgICAgfQogICAgIAogICAgICAgIH0sCiAgICAgICAgInZlcnNpb24iOiA2NjIwNDMyMAogICAgfQp9Cg==",
+    "client_configs": [
+        "employee/APM_TRACING/test_rc_update/lib_update",
+        "employee/AGENT_TASK/test_rc_update/flare_task",
+        "employee/AGENT_CONFIG/test_rc_update/flare_conf"
+    ],
+    "target_files": [
+      {
+        "path": "employee/AGENT_CONFIG/test_rc_update/flare_conf",
+        "raw": "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"
+      },
+      {
+        "path": "employee/APM_TRACING/test_rc_update/lib_update",
+        "raw": "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"
+      },
+      {
+        "path": "employee/AGENT_TASK/test_rc_update/flare_task",
+        "raw": "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"
+      }
+    ]
+}

fuzz/remote-configuration/corpus/input16.json

@@ -0,0 +1,22 @@
+{
+    "targets": "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",
+    "client_configs": [
+        "employee/APM_TRACING/test_rc_update/lib_update",
+        "employee/AGENT_TASK/test_rc_update/flare_task",
+        "employee/AGENT_CONFIG/test_rc_update/flare_conf"
+    ],
+    "target_files": [
+      {
+        "path": "employee/AGENT_CONFIG/test_rc_update/flare_conf",
+        "raw": "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"
+      },
+      {
+        "path": "employee/APM_TRACING/test_rc_update/lib_update",
+        "raw": "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"
+      },
+      {
+        "path": "employee/AGENT_TASK/test_rc_update/flare_task",
+        "raw": "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"
+      }
+    ]
+}

fuzz/remote-configuration/corpus/input17.json

@@ -0,0 +1,17 @@
+{
+    "targets": "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",
+    "client_configs": [
+        "employee/AGENT_TASK/test_rc_update/flare_task",
+        "employee/AGENT_CONFIG/test_rc_update/flare_conf"
+    ],
+    "target_files": [
+      {
+        "path": "employee/AGENT_CONFIG/test_rc_update/flare_conf",
+        "raw": "eyAiaWQiOiAiODI3ZWFjZjhkYmMzYWIxNDM0ZDMyMWNiODFkZmJmN2FmZTY1NGE0YjYxMTFjZjE2NjBiNzFjY2Y4OTc4MTkzOCIsICJyZXZpc2lvbiI6IDE2OTgxNjcxMjYwNjQsICJzY2hlbWFfdmVyc2lvbiI6ICJ2MS4wLjAiLCAiYWN0aW9uIjogImVuYWJsZSIsICJsaWJfY29uZmlnIjogeyAibGlicmFyeV9sYW5ndWFnZSI6ICJhbGwiLCAibGlicmFyeV92ZXJzaW9uIjogImxhdGVzdCIsICJzZXJ2aWNlX25hbWUiOiAidGVzdHN2YyIsICJlbnYiOiAidGVzdCIsICJ0cmFjaW5nX2VuYWJsZWQiOiB0cnVlLCAidHJhY2luZ19zYW1wbGluZ19yYXRlIjogMC42IH0sICJzZXJ2aWNlX3RhcmdldCI6IHsgInNlcnZpY2UiOiAidGVzdHN2YyIsICJlbnYiOiAidGVzdCIgfSB9"
+      },
+      {
+        "path": "employee/AGENT_TASK/test_rc_update/flare_task",
+        "raw": "eyAiaWQiOiAiODI3ZWFjZjhkYmMzYWIxNDM0ZDMyMWNiODFkZmJmN2FmZTY1NGE0YjYxMTFjZjE2NjBiNzFjY2Y4OTc4MTkzOCIsICJyZXZpc2lvbiI6IDE2OTgxNjcxMjYwNjQsICJzY2hlbWFfdmVyc2lvbiI6ICJ2MS4wLjAiLCAiYWN0aW9uIjogImVuYWJsZSIsICJsaWJfY29uZmlnIjogeyAibGlicmFyeV9sYW5ndWFnZSI6ICJhbGwiLCAibGlicmFyeV92ZXJzaW9uIjogImxhdGVzdCIsICJzZXJ2aWNlX25hbWUiOiAidGVzdHN2YyIsICJlbnYiOiAidGVzdCIsICJ0cmFjaW5nX2VuYWJsZWQiOiB0cnVlLCAidHJhY2luZ19zYW1wbGluZ19yYXRlIjogMC42IH0sICJzZXJ2aWNlX3RhcmdldCI6IHsgInNlcnZpY2UiOiAidGVzdHN2YyIsICJlbnYiOiAidGVzdCIgfSB9"
+      }
+    ]
+}

fuzz/remote-configuration/corpus/input18.json

@@ -0,0 +1,4 @@
+{
+"targets": "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",
+"target_files": [{}]
+}

fuzz/remote-configuration/corpus/input2.json

@@ -0,0 +1 @@
+{ "targets": "" }

fuzz/remote-configuration/corpus/input3.json

@@ -0,0 +1 @@
+{ "targets": "Hello, Mars!" }

fuzz/remote-configuration/corpus/input4.json

@@ -0,0 +1 @@
+{ "targets": "bm90IGpzb24=" }

fuzz/remote-configuration/corpus/input5.json

@@ -0,0 +1 @@
+{ "targets": "eyJmb28iOiAiYmFyIn0=" }

fuzz/remote-configuration/corpus/input6.json

@@ -0,0 +1,4 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAiY3VzdG9tIjogeyJvcGFxdWVfYmFja2VuZF9zdGF0ZSI6ICIxNSJ9fX0=",
+    "client_configs": ["employee/APM_TRACING/missing_target/conf"]
+}

fuzz/remote-configuration/corpus/input7.json

@@ -0,0 +1,4 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZm9vIjoge30sICJiYXIiOiB7fX0sImN1c3RvbSI6IHsib3BhcXVlX2JhY2tlbmRfc3RhdGUiOiAiMTUifX19",
+    "client_configs": ["employee/APM_TRACING/missing_client_entry/conf"]
+}

fuzz/remote-configuration/corpus/input8.json

@@ -0,0 +1,4 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"]
+}

fuzz/remote-configuration/corpus/input9.json

@@ -0,0 +1,5 @@
+{
+    "targets": "eyJzaWduZWQiOiB7InZlcnNpb24iOiAyLCAidGFyZ2V0cyI6IHsiZW1wbG95ZWUvQVBNX1RSQUNJTkcvdmFsaWRfY29uZl9wYXRoL2NvbmZpZyI6IHt9LCAiYmFyIjoge319LCJjdXN0b20iOiB7Im9wYXF1ZV9iYWNrZW5kX3N0YXRlIjogIjE1In19fQ==",
+    "client_configs": ["employee/APM_TRACING/valid_conf_path/config"],
+    "target_files": []
+}

fuzz/remote-configuration/main.cpp

@@ -0,0 +1,36 @@
+#include <datadog/logger.h>
+#include <datadog/remote_config/remote_config.h>
+#include <datadog/string_view.h>
+
+#include <cstdint>
+#include <sstream>
+#include <string>
+
+namespace dd = datadog;
+
+class NoopLogger : public dd::tracing::Logger {
+  std::mutex mutex_;
+  std::ostringstream stream_;
+
+ public:
+  void log_error(const LogFunc&) override{};
+  void log_startup(const LogFunc&) override{};
+  using Logger::log_error;  // expose the non-virtual overloads
+
+ private:
+  void log(const LogFunc&){};
+};
+
+extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data, size_t size) {
+  dd::tracing::TracerSignature signature(dd::tracing::RuntimeID::generate(),
+                                         "foosvc", "fooenv");
+  std::vector<std::shared_ptr<dd::remote_config::Listener>> listener;
+  auto logger = std::make_shared<NoopLogger>();
+  datadog::remote_config::Manager manager(signature, listener, logger);
+  std::string in((char*)data, size);
+  auto j = nlohmann::json::parse(in, nullptr, false);
+  if (j.is_discarded()) return 0;
+
+  manager.process_response(j);
+  return 0;
+}

include/datadog/error.h

@@ -78,6 +78,7 @@ struct Error {
     REMOTE_CONFIGURATION_INVALID_INPUT = 53,
     BAGGAGE_MAXIMUM_BYTES_REACHED = 54,
     BAGGAGE_MAXIMUM_ITEMS_REACHED = 55,
+    REMOTE_CONFIGURATION_INVALID_JSON = 56,
   };
 
   Code code;