feat: S39 detect a TLS configuration change from the stream - #809
feat: S39 detect a TLS configuration change from the stream#809DavidCozens wants to merge 1 commit into
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Adds a mandatory Version member to the SolidSyslogStream vtable and a Version / VersionContext pair to both TLS stream configs. The stream sender polls it every Send alongside the endpoint version and reconnects when either has moved, so rotating credentials or repinning a peer is a counter bump from any task rather than a Disconnect call that races the servicing pass. Narrows the SolidSyslogSender_Disconnect contract to the servicing thread and moves both rotation passages in docs/tls.md onto the version.
WalkthroughThe stream interface now exposes a monotonic configuration version. The sender detects endpoint or stream version changes and reconnects. Mbed TLS and OpenSSL accept version callbacks. Other streams report zero. Tests and TLS documentation cover the new behaviour. ChangesStream version contract and sender handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟠 High · up to Credential rotation or peer-policy changes can appear successful while reconnecting with stale TLS settings, and concurrent version updates are not safely defined. These contracts should be corrected before merge. Sequence Diagram(s)sequenceDiagram
participant Sender
participant Stream
participant Connection
Sender->>Stream: poll configuration version
Sender->>Connection: compare stored and current versions
Connection-->>Sender: close when the version changes
Sender->>Stream: reopen and send the record
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 9.09% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 88 functions across 27 files. (4 skipped: 4 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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☀️ Quality Summary Created by Quality Monitor v4.15.0 (#82d77af). More details are shown in the GitHub Checks Result. |
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Actionable comments posted: 8
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Inline comments:
In `@Core/Interface/SolidSyslogStreamDefinition.h`:
- Around line 48-53: Define the synchronization contract for
SolidSyslogStreamVersionFunction: require synchronized reads and ensure adapters
publish configuration before updating the version observed by
StreamSender_ConfigurationMoved. Update OpenSslStream_Version and
MbedTlsStream_Version accordingly, and add concurrent-update coverage for both
adapters.
In `@Core/Source/SolidSyslogNullStream.c`:
- Around line 67-71: Update both callback functions in SolidSyslogNullStream,
including NullStream_Version, to return the unsigned zero literal 0U instead of
0, preserving their existing behavior.
In `@docs/tls.md`:
- Around line 207-208: Update the destination-change clause in the TLS
documentation to say the connection closes only when the configured endpoint
version changes, and instruct integrators to advance the value returned by
EndpointVersion to trigger reconnection; preserve the existing behavior for
EndpointVersion == NULL, which pins the destination.
In `@Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h`:
- Around line 86-92: Update the documentation for
SolidSyslogStreamVersionFunction and VersionContext to require rotation to
mutate the stable objects referenced by the original configuration, rather than
replacing config->Credentials or config->ServerName pointers. Clarify that
reconnects use those referenced objects after Version changes, while preserving
the existing polling and NULL semantics.
In `@Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h`:
- Around line 73-80: Update the Version contract used by
SolidSyslogOpenSslStream_Initialise so reconnects cannot depend on replaced
caller-side Credentials, ServerName, or CipherList values after the
configuration is copied. Require updates through stable referenced objects, or
provide a reconnect-time configuration accessor that returns current values,
matching the Mbed TLS contract and including CipherList.
In `@Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c`:
- Line 696: Update OpenSslStream_NullVersion to return the unsigned zero literal
0U, preserving its uint32_t return behavior.
In `@Platform/Posix/Source/SolidSyslogPosixTcpStream.c`:
- Around line 341-344: Update the PosixTcpStream_Version function’s uint32_t
return literal from 0 to 0U, preserving the existing value and behavior while
meeting the unsigned-literal coding standard.
In `@Tests/SolidSyslogStreamSenderTest.cpp`:
- Around line 936-969: Extract the shared sender fields, setup/teardown
lifecycle, and Send() helper from SolidSyslogStreamSenderStreamVersion into a
TEST_BASE fixture, then have both sender test groups use TEST_GROUP_BASE with
that fixture. Preserve the group-specific error-handler setup in
SolidSyslogStreamSenderDeliveryHealth.
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📒 Files selected for processing (31)
Core/Interface/SolidSyslogSender.hCore/Interface/SolidSyslogStream.hCore/Interface/SolidSyslogStreamDefinition.hCore/Source/SolidSyslogNullStream.cCore/Source/SolidSyslogStream.cCore/Source/SolidSyslogStreamSender.cCore/Source/SolidSyslogStreamSenderPrivate.hPlatform/LwipRaw/Source/SolidSyslogLwipRawTcpStream.cPlatform/MbedTls/Interface/SolidSyslogMbedTlsStream.hPlatform/MbedTls/Source/SolidSyslogMbedTlsStream.cPlatform/OpenSsl/Interface/SolidSyslogOpenSslStream.hPlatform/OpenSsl/Source/SolidSyslogOpenSslStream.cPlatform/PlusTcp/Source/SolidSyslogPlusTcpTcpStream.cPlatform/Posix/Source/SolidSyslogPosixTcpStream.cPlatform/Windows/Source/SolidSyslogWinsockTcpStream.cTests/FreeRtos/SolidSyslogPlusTcpTcpStreamTest.cppTests/Lwip/SolidSyslogLwipRawTcpStreamTest.cppTests/MbedTls/SolidSyslogMbedTlsStreamTest.cppTests/MbedTlsIntegration/SocketStream.cTests/OpenSslIntegration/BioPairStream.cTests/SolidSyslogNullStreamTest.cppTests/SolidSyslogOpenSslStreamTest.cppTests/SolidSyslogPosixTcpStreamTest.cppTests/SolidSyslogStreamSenderTest.cppTests/SolidSyslogWinsockTcpStreamTest.cppTests/StreamFake.cTests/StreamFake.hdocs/platforms/mbedtls/index.mddocs/platforms/openssl/index.mddocs/tls.mdmisra_suppressions.txt
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| /** Report a monotonic version of this stream's own configuration - what it | ||
| * will present or accept on the next Open. Bump it when that changes and | ||
| * the sender reconnects on its next pass. Polled every Send, so it must be | ||
| * cheap and pure. A stream with nothing to change reports 0 for its | ||
| * lifetime. */ | ||
| uint32_t (*Version)(struct SolidSyslogStream* base); |
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🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift
🔎 Supported by static analysis
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Core Platform Tests docsRepository: cososo-ltd/solid-syslog
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set -eu
printf '%s\n' '--- changed declaration and public version contract ---'
cat -n Core/Interface/SolidSyslogStreamDefinition.h | sed -n '35,60p'
cat -n Core/Interface/SolidSyslogStream.h | sed -n '55,75p'
printf '%s\n' '--- sender polling and comparison path ---'
cat -n Core/Source/SolidSyslogStreamSender.c | sed -n '105,145p'
rg -n -C 4 'ConfigurationMoved|LastStreamVersion|LastEndpointVersion|SolidSyslogStream_Version' Core/Source Core/Interface
printf '%s\n' '--- platform configuration declarations and version bridges ---'
cat -n Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h | sed -n '60,84p'
cat -n Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h | sed -n '72,96p'
cat -n Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c | sed -n '155,176p;685,712p'
cat -n Platform/MbedTls/Source/SolidSyslogMbedTlsStream.c | sed -n '175,192p;125,147p'
printf '%s\n' '--- synchronisation and runtime-update wording ---'
rg -n -i -C 3 'thread|task|atomic|volatile|memory order|memory barrier|publish|runtime|rotation|version' Core Platform docs TestsRepository: cososo-ltd/solid-syslog
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cat -n Core/Interface/SolidSyslogStreamDefinition.h | sed -n '40,58p'
cat -n Core/Interface/SolidSyslogStream.h | sed -n '60,73p'
printf '%s\n' '--- sender version data flow ---'
cat -n Core/Source/SolidSyslogStreamSender.c | sed -n '112,134p'
rg -n -C 5 'StreamSender_ConfigurationMoved|LastStreamVersion|streamVersion|VersionChangeBetweenSends|StreamFake_SetVersion' \
Core/Source/SolidSyslogStreamSender.c Core/Source/SolidSyslogStreamSender.h Tests/SolidSyslogStreamSenderTest.cpp
printf '%s\n' '--- platform callback contracts ---'
cat -n Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h | sed -n '68,83p'
cat -n Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h | sed -n '80,95p'
cat -n Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c | sed -n '165,175p'
cat -n Platform/MbedTls/Source/SolidSyslogMbedTlsStream.c | sed -n '181,191p'
printf '%s\n' '--- repository synchronisation primitives and related obligations ---'
rg -n -C 4 'typedef.*Atomic|AtomicCounter|memory_order|stdatomic|LockConfig|UnlockConfig|must be.*thread|thread-safe|shared.*thread|concurrently' \
Core/Interface Core/Source Platform/*/Interface docs Tests/SolidSyslogStreamSenderTest.cppRepository: cososo-ltd/solid-syslog
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cat -n Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h | sed -n '68,83p'
cat -n Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h | sed -n '80,95p'
printf '%s\n' '--- platform callback invocation ---'
cat -n Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c | sed -n '165,175p'
cat -n Platform/MbedTls/Source/SolidSyslogMbedTlsStream.c | sed -n '181,191p'
printf '%s\n' '--- sender comparison ---'
cat -n Core/Source/SolidSyslogStreamSender.c | sed -n '132,140p'
printf '%s\n' '--- related synchronisation contracts ---'
rg -n -C 4 'AtomicCounter|stdatomic|memory_order|LockConfig|UnlockConfig|thread-safe|shared.*thread|concurrently' \
Core/Interface Core/Source Platform/Posix/Interface Platform/Windows/Interface docs Tests/SolidSyslogStreamSenderTest.cppRepository: cososo-ltd/solid-syslog
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Define synchronised version publication for SolidSyslogStreamVersionFunction.
OpenSslStream_Version and MbedTlsStream_Version call Version directly. StreamSender_ConfigurationMoved then compares the returned value to trigger reconnection. The public contract only says to “Bump it”. If another task updates a non-atomic version or configuration, the read can race under MISRA C:2012 Rule 1.3. Publishing the version before the configuration can also make reconnection use stale state. Document synchronised reads and publish configuration before the version. Add concurrent-update coverage for the OpenSSL and Mbed TLS adapters.
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In `@Core/Interface/SolidSyslogStreamDefinition.h` around lines 48 - 53, Define
the synchronization contract for SolidSyslogStreamVersionFunction: require
synchronized reads and ensure adapters publish configuration before updating the
version observed by StreamSender_ConfigurationMoved. Update
OpenSslStream_Version and MbedTlsStream_Version accordingly, and add
concurrent-update coverage for both adapters.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli.
| static uint32_t NullStream_Version(struct SolidSyslogStream* base) | ||
| { | ||
| (void) base; | ||
| return 0; | ||
| } |
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📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value
Use unsigned zero literals in both callbacks. The production-C guidance for these tiers requires the U suffix in unsigned contexts. Replace both return 0; statements with return 0U;.
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minimal, and validate.
In `@Core/Source/SolidSyslogNullStream.c` around lines 67 - 71, Update both
callback functions in SolidSyslogNullStream, including NullStream_Version, to
return the unsigned zero literal 0U instead of 0, preserving their existing
behavior.
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| a send fails, when the destination changes, when the stream's own configuration | ||
| version moves, when the integrator calls `SolidSyslogSender_Disconnect`, or when |
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🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win
Qualify the destination-change trigger.
Core/Interface/SolidSyslogStreamSender.h states that EndpointVersion == NULL pins the destination and prevents reconnection for destination changes. The current text says that any destination change closes the connection. State that the close occurs when the configured endpoint version changes, and tell integrators to advance the value returned by EndpointVersion.
Proposed wording
- It closes when a send fails, when the destination changes, when the stream's own
+ It closes when a send fails, when the configured endpoint version changes, when the stream's ownAs per path instructions, flag statements that contradict the authoritative references.
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In `@docs/tls.md` around lines 207 - 208, Update the destination-change clause in
the TLS documentation to say the connection closes only when the configured
endpoint version changes, and instruct integrators to advance the value returned
by EndpointVersion to trigger reconnection; preserve the existing behavior for
EndpointVersion == NULL, which pins the destination.
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Source: Path instructions
| /** Bumped by the integrator when anything above changes at runtime - the | ||
| * Credentials or ServerName. The sender polls it every Send and reconnects | ||
| * on the next pass when it moves, so a rotation applies without calling | ||
| * SolidSyslogSender_Disconnect. Polled from the servicing thread, so it | ||
| * must be cheap and pure. NULL means this configuration never changes. */ | ||
| SolidSyslogStreamVersionFunction Version; | ||
| void* VersionContext; /**< Passed to Version unchanged; NULL is fine. */ |
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🔒 Security & Privacy | 🟠 Major | ⚡ Quick win
Restrict versioned updates to stable referenced data
Although the sender reconnects after Version changes, SolidSyslogMbedTlsStream_Initialise copies *config into self->Config, and Open uses that copy. Replacing config->Credentials or config->ServerName can therefore leave reconnects using stale credentials or peer names. Update this header to state that rotation must mutate stable objects referenced by the original configuration.
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In `@Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h` around lines 86 - 92,
Update the documentation for SolidSyslogStreamVersionFunction and VersionContext
to require rotation to mutate the stable objects referenced by the original
configuration, rather than replacing config->Credentials or config->ServerName
pointers. Clarify that reconnects use those referenced objects after Version
changes, while preserving the existing polling and NULL semantics.
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| /** Bumped by the integrator when anything above changes at runtime - the | ||
| * Credentials, ServerName or CipherList. The sender polls it every Send and | ||
| * reconnects on the next pass when it moves, so a rotation applies without | ||
| * calling SolidSyslogSender_Disconnect. Polled from the servicing thread, | ||
| * so it must be cheap and pure. NULL means this configuration never | ||
| * changes. */ | ||
| SolidSyslogStreamVersionFunction Version; | ||
| void* VersionContext; /**< Passed to Version unchanged; NULL is fine. */ |
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🔒 Security & Privacy | 🟠 Major | ⚡ Quick win
Align the Version contract with the copied configuration. SolidSyslogOpenSslStream_Initialise copies *config, and reconnects use self->Config for Credentials, ServerName, and CipherList. Replacing those fields in the caller's config before bumping Version therefore reconnects with stale TLS policy. Require stable field values with updates made through referenced objects or add a reconnect-time configuration accessor. Apply the same rule as the Mbed TLS contract, including CipherList.
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In `@Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h` around lines 73 - 80,
Update the Version contract used by SolidSyslogOpenSslStream_Initialise so
reconnects cannot depend on replaced caller-side Credentials, ServerName, or
CipherList values after the configuration is copied. Require updates through
stable referenced objects, or provide a reconnect-time configuration accessor
that returns current values, matching the Mbed TLS contract and including
CipherList.
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| static uint32_t OpenSslStream_NullVersion(void* context) | ||
| { | ||
| (void) context; | ||
| return 0; |
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📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value
Use an unsigned zero literal.
The Platform/*/Source production-C tier requires the U suffix in unsigned contexts. OpenSslStream_NullVersion returns uint32_t, so return 0U.
Proposed fix
- return 0;
+ return 0U;📝 Committable suggestion
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Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| return 0; | |
| return 0U; |
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In `@Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c` at line 696, Update
OpenSslStream_NullVersion to return the unsigned zero literal 0U, preserving its
uint32_t return behavior.
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| static uint32_t PosixTcpStream_Version(struct SolidSyslogStream* base) | ||
| { | ||
| (void) base; | ||
| return 0; |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Use unsigned zero literals in the uint32_t version providers.
The checked-in production-C baseline requires a U suffix for literals in unsigned contexts. Change each return 0; to return 0U;. This preserves the value but keeps the code aligned with the MISRA-informed standard.
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In `@Platform/Posix/Source/SolidSyslogPosixTcpStream.c` around lines 341 - 344,
Update the PosixTcpStream_Version function’s uint32_t return literal from 0 to
0U, preserving the existing value and behavior while meeting the
unsigned-literal coding standard.
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| TEST_GROUP(SolidSyslogStreamSenderStreamVersion) | ||
| { | ||
| struct SolidSyslogResolver* resolver = nullptr; | ||
| struct SolidSyslogStream* stream = nullptr; | ||
| struct SolidSyslogAddress* address = nullptr; | ||
| struct SolidSyslogStreamSenderConfig config{}; | ||
| struct SolidSyslogSender* sender = nullptr; | ||
|
|
||
| void setup() override | ||
| { | ||
| SocketFake_Reset(); | ||
| endpointGetHost = GetHost; | ||
| endpointVersion = 0; | ||
| endpointGetPort = GetPort; | ||
| resolver = SolidSyslogPosixResolver_Create(); | ||
| stream = StreamFake_Create(); | ||
| address = SolidSyslogPosixAddress_Create(); | ||
| config = {resolver, stream, address, TestEndpoint, TestEndpointVersion, nullptr}; | ||
| sender = SolidSyslogStreamSender_Create(&config); | ||
| } | ||
|
|
||
| void teardown() override | ||
| { | ||
| SolidSyslogStreamSender_Destroy(sender); | ||
| SolidSyslogPosixAddress_Destroy(address); | ||
| StreamFake_Destroy(stream); | ||
| SolidSyslogPosixResolver_Destroy(resolver); | ||
| } | ||
|
|
||
| void Send() const | ||
| { | ||
| SolidSyslogSender_Send(sender, TEST_MESSAGE, TEST_MESSAGE_LEN); | ||
| } | ||
| }; |
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📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win
Extract the shared sender fixture into TEST_BASE.
Both groups share the sender storage, fake setup, teardown, and Send() helper. The Tests convention requires shared fixtures to use TEST_BASE and TEST_GROUP_BASE; keep the group-specific error-handler setup in SolidSyslogStreamSenderDeliveryHealth.
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In `@Tests/SolidSyslogStreamSenderTest.cpp` around lines 936 - 969, Extract the
shared sender fields, setup/teardown lifecycle, and Send() helper from
SolidSyslogStreamSenderStreamVersion into a TEST_BASE fixture, then have both
sender test groups use TEST_GROUP_BASE with that fixture. Preserve the
group-specific error-handler setup in SolidSyslogStreamSenderDeliveryHealth.
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1 participant
Purpose
Step 12 of E39. Closes the change-detection gap in #735: a TLS stream had no
equivalent of
SolidSyslogEndpointVersionFunction, so the documented way toapply a rotated credential or a repinned peer was
SolidSyslogSender_Disconnect.The issue body has been rewritten with the agreed shape and with the threading
argument found while designing this, which is the substantive reason the gap was
worth closing rather than an ergonomic one.
SolidSyslogSenderDefinition.hdocuments
Sendas called on the servicing thread and not reentrant;Disconnectis a sibling on the same vtable, mutating the same connection state, and there is
no lock in the stream sender or in either TLS stream. An integrator rotating
credentials on a provisioning thread, or bounding credential residency from a
timer, therefore raced the servicing pass and had no way to fix it - the state is
private to the translation unit.
docs/tls.mdrecommended exactly that, twice.No
Closeskeyword: this merges intofeature/tls-rework, and the issue isclosed from the final branch-to-main PR.
Change Description
The version sits on the TLS stream config, not on the sender config, and reaches
Core through the
SolidSyslogStreamvtable. That was your call after I firstproposed the sender config, and it is the better one: the material and the signal
that it changed are declared together, exactly as the endpoint's are, so the
integrator reads the whole story off one struct. One counter then covers
everything on it - trust anchors, pinned fingerprints, the client credential, the
expected peer name, the cipher list - and whatever #733 adds. An integrator
wiring plain TCP sees no new field.
SolidSyslogStreamgains a mandatoryuint32_t (*Version)(base), answered bySolidSyslogStream_Version. Four plain TCP streams,NullStreamand the twointegration-test streams report 0 for their lifetime.
Version+VersionContext, with the Null Objectsubstituted at Initialise when the integrator wires none - the same shape
GetHandshakeTimeoutMsalready uses.StreamSenderkeepsLastStreamVersionbesideLastEndpointVersionandreconnects when either has moved, behind a named
StreamSender_ConfigurationMovedpredicate.SolidSyslogSender_Disconnectkeeps its behaviour; its contract now says itbelongs on the servicing thread and names the version as the alternative.
Adding a vtable member breaks any external
SolidSyslogStreamimplementation.Taken deliberately, on your ruling that no ports exist and 0.1.0 has not been
forked, and E39 is the release carrying the TLS API break.
One thing the design does not solve, and the Mbed TLS page now says so.
Moving a version applies a change asynchronously - the reconnect happens inside
the next
Send- so it says nothing about when the old material stopped beingread. That is fine for material replaced in place, but the Mbed TLS handle source
requires freeing what the open connection may still hold, and
MbedTlsHandleCredentials_Releaseis a verified no-op, so nothing announces theboundary to an integrator using it. That page now directs the free and re-parse
either to the servicing task after a
Disconnectreturns, or into a credentialssource's
Release.docs/tls.mdstates the same separation once: applying achange and destroying what it replaced are different questions.
Test Evidence
Red/green throughout, and every assertion mutation-checked.
StreamFake_SetVersion), then failedon the assertion once the fake existed. Filling the vtable member made the
whole suite segfault on the streams that had not been given one, which is what
drove each implementation in. Removing the stream-version term from the
reconnect condition fails exactly one test; making the reconnect lazy-only
fails the two version tests and both endpoint-version tests.
is wired. Passing
NULLinstead ofVersionContextand returning 1 from theNull Object fail one test each, per pack.
suites.
SecondSendDoesNotReconnectalready guards "steady version does not reconnect",so I did not add a duplicate.
Gates run locally: gcc debug (2 suites) and freertos-host (24 suites, both
integration lanes against the real libraries) green;
clang-formatreflow overthe tree, then
misra_renumber.py --apply(16 updates, settled on re-run);CI's own
cppcheck --addon=misrainvocation reproduced - six findings, allpre-existing and none in a file this branch touches; markdownlint 0 errors;
check_references.py,check_platform_docs.py,check_spdx_headers.pyandcheck_headers_c89.py(179 public headers against ISO C89) all pass.Not run locally, left to CI: tidy, sanitize, coverage, Windows, BDD, IWYU.
Areas Affected
SolidSyslogStreamis a public vtable, so this is an API break for externalstream implementations. Core (
Stream,StreamSender,NullStream), all sixproduction stream adapters, both TLS packs' public configs, three test streams,
docs/tls.mdand both TLS platform pages.No BDD movement: nothing an end user observes changes, and the equivalence matrix
is about peer behaviour. Scenario count unchanged.
Summary by CodeRabbit
New Features
Documentation
Tests