basic structure

.clang-format

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+---
+Language:        Cpp
+# BasedOnStyle:  Google
+AccessModifierOffset: -1
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: None
+AlignConsecutiveMacros: None
+AlignConsecutiveAssignments: None
+AlignConsecutiveBitFields: None
+AlignConsecutiveDeclarations: None
+AlignEscapedNewlines: Left
+AlignOperands:   Align
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortEnumsOnASingleLine: false
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: Yes
+AttributeMacros:
+  - __capability
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: Never
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  BeforeLambdaBody: false
+  BeforeWhile:     false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeConceptDeclarations: true
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeColon
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+QualifierAlignment: Leave
+CompactNamespaces: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: true
+DisableFormat:   false
+EmptyLineAfterAccessModifier: Never
+EmptyLineBeforeAccessModifier: LogicalBlock
+ExperimentalAutoDetectBinPacking: false
+PackConstructorInitializers: NextLine
+BasedOnStyle:    ''
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+AllowAllConstructorInitializersOnNextLine: true
+FixNamespaceComments: true
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IfMacros:
+  - KJ_IF_MAYBE
+IncludeBlocks:   Regroup
+IncludeCategories:
+  - Regex:           '^<ext/.*\.h>'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^<.*\.h>'
+    Priority:        1
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^<.*'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '.*'
+    Priority:        3
+    SortPriority:    0
+    CaseSensitive:   false
+IncludeIsMainRegex: '([-_](test|unittest))?$'
+IncludeIsMainSourceRegex: ''
+IndentAccessModifiers: false
+IndentCaseLabels: true
+IndentCaseBlocks: false
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentExternBlock: AfterExternBlock
+IndentRequires:  false
+IndentWidth:     2
+IndentWrappedFunctionNames: false
+InsertTrailingCommas: None
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+LambdaBodyIndentation: Signature
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Never
+ObjCBlockIndentWidth: 2
+ObjCBreakBeforeNestedBlockParam: true
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 1
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakOpenParenthesis: 0
+PenaltyBreakString: 1000
+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PenaltyIndentedWhitespace: 0
+PointerAlignment: Left
+PPIndentWidth:   -1
+RawStringFormats:
+  - Language:        Cpp
+    Delimiters:
+      - cc
+      - CC
+      - cpp
+      - Cpp
+      - CPP
+      - 'c++'
+      - 'C++'
+    CanonicalDelimiter: ''
+    BasedOnStyle:    google
+  - Language:        TextProto
+    Delimiters:
+      - pb
+      - PB
+      - proto
+      - PROTO
+    EnclosingFunctions:
+      - EqualsProto
+      - EquivToProto
+      - PARSE_PARTIAL_TEXT_PROTO
+      - PARSE_TEST_PROTO
+      - PARSE_TEXT_PROTO
+      - ParseTextOrDie
+      - ParseTextProtoOrDie
+      - ParseTestProto
+      - ParsePartialTestProto
+    CanonicalDelimiter: pb
+    BasedOnStyle:    google
+ReferenceAlignment: Pointer
+ReflowComments:  true
+RemoveBracesLLVM: false
+SeparateDefinitionBlocks: Leave
+ShortNamespaceLines: 1
+SortIncludes:    CaseSensitive
+SortJavaStaticImport: Before
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeParensOptions:
+  AfterControlStatements: true
+  AfterForeachMacros: true
+  AfterFunctionDefinitionName: false
+  AfterFunctionDeclarationName: false
+  AfterIfMacros:   true
+  AfterOverloadedOperator: false
+  BeforeNonEmptyParentheses: false
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  Never
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInLineCommentPrefix:
+  Minimum:         1
+  Maximum:         -1
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+BitFieldColonSpacing: Both
+Standard:        Auto
+StatementAttributeLikeMacros:
+  - Q_EMIT
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        8
+UseCRLF:         false
+UseTab:          Never
+WhitespaceSensitiveMacros:
+  - STRINGIZE
+  - PP_STRINGIZE
+  - BOOST_PP_STRINGIZE
+  - NS_SWIFT_NAME
+  - CF_SWIFT_NAME
+...
+

.editorconfig

@@ -0,0 +1,8 @@
+[*]
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 80
+indent_style = space
+indent_size = 2

.gitignore

@@ -0,0 +1 @@
+/Build/

CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.20)
+project(matrix LANGUAGES C)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
+find_package(libev REQUIRED)
+find_package(libtls REQUIRED)
+
+include(AddAutoformatTarget)
+include(Makeheaders)
+
+add_subdirectory(src)

LICENSE

@@ -0,0 +1,13 @@
+Copyright (c) 2022 Thomas Lindner <tom@dl6tom.de>
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

build.sh

@@ -0,0 +1,2 @@
+[ -f Build/build.ninja ] || cmake -G Ninja -B Build
+exec ninja -C Build "$@"

cmake/AddAutoformatTarget.cmake

@@ -0,0 +1,23 @@
+find_program(_CLANG_FORMAT clang-format)
+
+if(_CLANG_FORMAT)
+  add_executable(clang-format IMPORTED)
+  set_target_properties(clang-format PROPERTIES
+    IMPORTED_LOCATION ${_CLANG_FORMAT})
+endif()
+
+unset(_CLANG_FORMAT)
+
+function(add_autoformat_target target)
+  get_target_property(source_dir ${target} SOURCE_DIR)
+  get_target_property(sources ${target} SOURCES)
+  add_custom_target(autoformat_${target}
+    COMMAND clang-format -i -- ${sources}
+    WORKING_DIRECTORY ${source_dir}
+    COMMENT "Autoformating sources of target ${target}"
+    VERBATIM)
+  if(NOT TARGET autoformat)
+    add_custom_target(autoformat)
+  endif()
+  add_dependencies(autoformat autoformat_${target})
+endfunction()

cmake/Findlibev.cmake

@@ -0,0 +1,20 @@
+find_path(libev_INCLUDE_DIR ev.h)
+mark_as_advanced(libev_INCLUDE_DIR)
+
+find_library(libev_LIBRARY ev)
+mark_as_advanced(libev_LIBRARY)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  libev DEFAULT_MSG libev_LIBRARY libev_INCLUDE_DIR)
+
+if(libev_FOUND AND NOT TARGET libev::ev)
+  add_library(libev::ev SHARED IMPORTED)
+  set_target_properties(libev::ev PROPERTIES
+    IMPORTED_LOCATION ${libev_LIBRARY}
+    INTERFACE_INCLUDE_DIRECTORIES ${libev_INCLUDE_DIR})
+  #  target_compile_definitions(libev::ev
+  #    INTERFACE
+  #      EV_COMPAT3=0
+  #      EV_MULTIPLICITY=1)
+endif()

cmake/Findlibtls.cmake

@@ -0,0 +1,16 @@
+find_path(libtls_INCLUDE_DIR tls.h)
+mark_as_advanced(libtls_INCLUDE_DIR)
+
+find_library(libtls_LIBRARY tls)
+mark_as_advanced(libtls_LIBRARY)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  libtls DEFAULT_MSG libtls_LIBRARY libtls_INCLUDE_DIR)
+
+if(libtls_FOUND AND NOT TARGET libtls::tls)
+  add_library(libtls::tls SHARED IMPORTED)
+  set_target_properties(libtls::tls PROPERTIES
+    IMPORTED_LOCATION ${libtls_LIBRARY}
+    INTERFACE_INCLUDE_DIRECTORIES ${libtls_INCLUDE_DIR})
+endif()

cmake/Makeheaders.cmake

@@ -0,0 +1,36 @@
+find_program(_MAKEHEADERS makeheaders)
+
+if(_MAKEHEADERS)
+  add_executable(makeheaders IMPORTED)
+  set_target_properties(makeheaders PROPERTIES
+    IMPORTED_LOCATION ${_MAKEHEADERS})
+else()
+  add_executable(makeheaders ${CMAKE_CURRENT_LIST_DIR}/makeheaders.c)
+endif()
+
+unset(_MAKEHEADERS)
+
+function(target_makeheaders target)
+  get_target_property(binary_dir ${target} BINARY_DIR)
+  get_target_property(source_dir ${target} SOURCE_DIR)
+  get_target_property(sources ${target} SOURCES)
+  foreach(source ${sources})
+    cmake_path(REPLACE_EXTENSION source h OUTPUT_VARIABLE header)
+    cmake_path(ABSOLUTE_PATH source
+      BASE_DIRECTORY ${source_dir}
+      NORMALIZE)
+    list(APPEND makeheader_args ${source}:${header})
+    cmake_path(ABSOLUTE_PATH header
+      BASE_DIRECTORY ${binary_dir}
+      NORMALIZE)
+    list(APPEND generated_headers ${header})
+  endforeach()
+  add_custom_command(
+    OUTPUT ${generated_headers}
+    COMMAND makeheaders -local -- ${makeheader_args}
+    DEPENDS ${sources}
+    COMMENT "Generating headers for target ${target}"
+    VERBATIM)
+  target_sources(${target} PRIVATE ${generated_headers})
+  target_include_directories(${target} PRIVATE ${binary_dir})
+endfunction()

src/CMakeLists.txt

@@ -0,0 +1,11 @@
+add_executable(${PROJECT_NAME}
+  main.c
+  network.c
+)
+target_link_libraries(${PROJECT_NAME}
+  libev::ev
+  libtls::tls
+)
+target_makeheaders(${PROJECT_NAME})
+
+add_autoformat_target(${PROJECT_NAME})

src/main.c

@@ -0,0 +1,15 @@
+#include <ev.h>
+#include <main.h>
+#include <tls.h>
+
+int main(int argc, char **argv) {
+  struct tls_config *config;
+  Connection connection;
+
+  tls_init();
+  config = tls_config_new();
+  connection_init(EV_DEFAULT_ & connection, config);
+  ev_run(EV_DEFAULT_UC_ 0);
+  tls_config_free(config);
+  return 0;
+}

src/network.c

@@ -0,0 +1,26 @@
+#include <network.h>
+#include <unistd.h>
+
+#if INTERFACE
+
+#include <ev.h>
+#include <tls.h>
+
+struct Connection {
+  ev_io watcher;
+  struct tls *ctx;
+};
+
+#endif
+
+void connection_init(EV_P_ Connection *connection, struct tls_config *config) {
+  ev_io_init(&connection->watcher, connection_cb, STDIN_FILENO, EV_READ);
+  ev_io_start(EV_A_ & connection->watcher);
+  connection->ctx = tls_client();
+  tls_configure(connection->ctx, config);
+}
+
+static void connection_cb(EV_P_ ev_io *w, int revents) {
+  ev_io_stop(EV_A_ w);
+  ev_break(EV_A_ EVBREAK_ALL);
+}