More setup

.gitignore

@@ -85,5 +85,4 @@ Temporary Items
 
 
 
-.vscode/
 build/

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    "files.associations": {
+        "properties.h": "c",
+        "__locale": "cpp",
+        "system_error": "cpp",
+        "typeinfo": "cpp"
+    },
+    "editor.rulers": [100]
+}

Makefile

@@ -7,9 +7,39 @@ OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
 DEPS := $(OBJS:.o=.d)
 INC_DIRS  := $(shell find $(SRC_DIRS) -type d)
 INC_FLAGS := $(addprefix -I,$(INC_DIRS))
-CPPFLAGS := $(INC_FLAGS) -MMD -MP -Ofast -fomit-frame-pointer
+CPPFLAGS := $(INC_FLAGS) -MMD -MP -Wall -Wno-unused-command-line-argument
 LDFLAGS  := -pthread -lpthread
 
+#
+RELEASE_FLAGS := -Ofast -DNDEBUG -fvisibility=hidden -fstack-protector-strong \
+-fomit-frame-pointer -fPIE -fstack-clash-protection -fsanitize=bounds \
+-fsanitize-undefined-trap-on-error -D_FORTIFY_SOURCE=3 -flto
+# RELEASE_LDFLAGS := -Wl,-z,relro,-z,now,-z,noexecstack,-z,separate-code
+
+DEBUG_FLAGS := -O0 -g3 -fno-omit-frame-pointer -fno-common -fno-optimize-sibling-calls
+ASAN_FLAGS := $(DEBUG_FLAGS) -fsanitize=address,undefined
+MSAN_FLAGS := $(DEBUG_FLAGS) -fsanitize=memory -fsanitize-memory-track-origins=2
+TSAN_FLAGS := $(DEBUG_FLAGS) -fsanitize=thread
+
+.PHONY: all debug asan msan tsan clean
+
+all: CPPFLAGS += $(RELEASE_FLAGS)
+# all: LDFLAGS += $(RELEASE_LDFLAGS)
+all: $(BUILD_DIR)/$(TARGET_EXEC)
+	strip $(BUILD_DIR)/$(TARGET_EXEC)
+
+debug: CPPFLAGS += $(DEBUG_FLAGS)
+debug: $(BUILD_DIR)/$(TARGET_EXEC)
+
+asan: CPPFLAGS += $(ASAN_FLAGS)
+asan: $(BUILD_DIR)/$(TARGET_EXEC)
+
+msan: CPPFLAGS += $(MSAN_FLAGS)
+msan: $(BUILD_DIR)/$(TARGET_EXEC)
+
+tsan: CPPFLAGS += $(TSAN_FLAGS)
+tsan: $(BUILD_DIR)/$(TARGET_EXEC)
+
 $(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
 	$(CC) $(OBJS) -o $@ $(LDFLAGS)
 
@@ -28,8 +58,6 @@ $(BUILD_DIR)/%.cpp.o: %.cpp
 	$(MKDIR_P) $(dir $@)
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
 
-.PHONY: clean
-
 clean:
 	$(RM) -r $(BUILD_DIR)
 

src/chat_node.h

@@ -3,3 +3,10 @@ typedef struct {
     unsigned short port;
     char *name;
 } Node;
+
+typedef struct {
+    Node *node;
+    Node *nextNode;
+} NodeListItem;
+
+typedef NodeListItem *NodeList;

src/main.c

@@ -3,6 +3,70 @@
 
 #include "chat_node.h"
 
+void *connection_handler(void *threadid)
+{
+    int thread_num = (int) threadid;
+    int sock_desc;
+
+    int32_t inputRaw, input;
+    int32_t responseRaw, response;
+    ssize_t response_length;
+
+    struct sockaddr_in serv_addr;
+
+    sock_desc = socket(AF_INET, SOCK_STREAM, 0);
+    if (sock_desc < 0) {
+        perror("Failed to create socket!");
+        return EXIT_FAILURE;
+    }
+
+    bzero((char *) &serv_addr, sizeof(serv_addr));
+
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(PORT);
+
+    if (inet_pton(AF_INET, SERVER_ADDR, &serv_addr.sin_addr) <= 0) {
+        perror("Error: Invalid address (address not supported)!");
+        return EXIT_FAILURE;
+    }
+
+    if (connect(sock_desc, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
+        perror("Error: Failed to connect to server!");
+        return EXIT_FAILURE;
+    }
+
+    printf("Client connected successfully: %d\n", thread_num);
+    while (true) {
+        printf("For thread: %d\n", thread_num);
+
+        printf("Enter input: ");
+        scanf("%d", &inputRaw);
+
+        input = htonl(inputRaw);
+
+        if (send(sock_desc, &input, sizeof(int32_t), 0) == -1) {
+            perror("Error: Send failed!");
+            return EXIT_FAILURE;
+        }
+
+        response_length = recv(sock_desc, &responseRaw, sizeof(int32_t), 0);
+        if (response_length != sizeof(int32_t)) {
+            perror("Error: Receive failed!");
+            return EXIT_FAILURE;
+        }
+
+        response = ntohl(responseRaw);
+
+        printf("Server response: %d\n", response);
+
+        sleep(5);
+    }
+
+    close(sock_desc);
+    return EXIT_SUCCESS;
+}
+
+
 int main(int argc, char *argv[]) {
     puts("=== chat_node ===\n");
 

src/message.h

@@ -2,13 +2,6 @@
 
 typedef uint8_t PacketHeader;
 
-typedef struct {
-    Node *node;
-    Node *nextNode;
-} NodeListItem;
-
-typedef NodeListItem *NodeList;
-
 typedef struct {
     PacketHeader header;