refact(Makefile): adjust to use libbpfgo lib

Signed-off-by: Alessio Greggi <ale_grey_91@hotmail.it>

Makefile

@@ -1,15 +1,24 @@
 BINARY_NAME=harpoon
 BINARY_DIR=./bin
+OUTPUT_DIR=./output
+
+build-static-libbpfgo:
+ git clone https://github.com/aquasecurity/libbpfgo.git && \
+ cd libbpfgo/ && \
+ make libbpfgo-static
 
 vmlinux.h:
  bpftool btf dump file /sys/kernel/btf/vmlinux format c > ebpf/vmlinux.h
 
-build-bpf:
- clang -g -O2 -c -target bpf -o ebpf.o ebpf/ebpf.c
+build-bpf: create-output-dir
+ clang -g -O2 -c -target bpf -o ${OUTPUT_DIR}/ebpf.o ebpf/ebpf.c
 
-build: create-bin-dir vmlinux.h build-bpf
+build: create-bin-dir vmlinux.h build-static-libbpfgo build-bpf
  go mod download
- CC=gcc CGO_CFLAGS="-I /usr/include/bpf" CGO_LDFLAGS="-lelf -lz /usr/lib64/libbpf.a" \
+ export CURRENT_DIR=$(shell pwd); \
+ CC=gcc \
+ CGO_CFLAGS="-I $$CURRENT_DIR/libbpfgo/output" \
+ CGO_LDFLAGS="-lelf -lz $$CURRENT_DIR/libbpfgo/output/libbpf.a" \
  go build \
  -tags core,ebpf \
  -v \
@@ -21,7 +30,10 @@ ifndef GITHUB_REF_NAME
  $(error GITHUB_REF_NAME is undefined)
 endif
  go mod download
- CC=gcc CGO_CFLAGS="-I /usr/include/bpf" CGO_LDFLAGS="-lelf -lz /usr/lib64/libbpf.a" \
+ export CURRENT_DIR=$(shell pwd); \
+ CC=gcc \
+ CGO_CFLAGS="-I $$CURRENT_DIR/libbpfgo/output" \
+ CGO_LDFLAGS="-lelf -lz $$CURRENT_DIR/libbpfgo/output/libbpf.a" \
  go build \
  -tags core,ebpf \
  -v \
@@ -32,5 +44,10 @@ endif
 create-bin-dir:
  mkdir -p ${BINARY_DIR}
 
+create-output-dir:
+ mkdir -p ${OUTPUT_DIR}
+
 clean:
- rm -rf ./bin
+ rm -rf ${OUTPUT_DIR}
+ rm -rf ${BINARY_DIR}
+ rm -rf ./libbpfgo