initial commit

Makefile

@@ -0,0 +1,43 @@
+CC      = clang
+CFLAGS  = -O2 -Wall -Wextra
+
+BPF_SRC = piggyback.bpf.c
+BPF_OBJ = piggyback.bpf.o
+SRV_SRC = piggyback.c
+SRV_BIN = piggyback
+CLI_SRC = pb-client.c
+CLI_BIN = pb-client
+
+# BPF include paths — adjust if headers are elsewhere
+BPF_INCLUDES = -I/usr/include/bpf -I/usr/include -I/usr/include/x86_64-linux-gnu
+
+.PHONY: all clean keygen
+
+all: $(BPF_OBJ) $(SRV_BIN) $(CLI_BIN)
+
+# eBPF kernel program — compiled to BPF bytecode
+$(BPF_OBJ): $(BPF_SRC)
+	$(CC) -O2 -target bpf $(BPF_INCLUDES) -c $< -o $@
+
+# Server daemon — requires libbpf + libsodium
+$(SRV_BIN): $(SRV_SRC)
+	$(CC) $(CFLAGS) $< -o $@ -lbpf -lsodium -lpthread
+
+# Client — requires libssl (OpenSSL) for Mode 2 TLS
+$(CLI_BIN): $(CLI_SRC)
+	$(CC) $(CFLAGS) $< -o $@ -lssl -lcrypto -lpthread
+
+# Generate Ed25519 keypair for use with -k flag
+# Private key: engagement.key (keep offline, never on target)
+# Public key:  engagement.pub.hex (pass to daemon via -k)
+keygen:
+	@openssl genpkey -algorithm ed25519 -out engagement.key
+	@openssl pkey -in engagement.key -pubout -out engagement.pub
+	@echo ""
+	@echo "Public key hex (pass to daemon with -k):"
+	@openssl pkey -in engagement.key -pubout -outform DER | tail -c 32 | xxd -p | tr -d '\n' | tr 'a-f' 'A-F'
+	@echo ""
+	@echo "Private key: engagement.key — keep offline, never copy to target"
+
+clean:
+	rm -f $(BPF_OBJ) $(SRV_BIN) $(CLI_BIN) engagement.key engagement.pub