first commit

Signed-off-by: Alessio Greggi <[email protected]>

.github/workflows/build-and-release.yaml

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+name: Build and Release
+on:
+  release:
+    types: [published]
+permissions:
+  contents: write
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # ratchet:actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@bfdd3570ce990073878bf10f6b2d79082de49492 # ratchet:actions/setup-go@v2
+        with:
+          go-version: '1.20'
+      - name: Install BCC Dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y bpfcc-tools libbpfcc-dev  # Install BCC dependencies
+          sudo apt install -y libseccomp-dev            # Install Seccomp dependencies
+      - name: Build and Test
+        run: |
+          make build-gh
+      - name: Upload Artifact
+        uses: actions/upload-artifact@82c141cc518b40d92cc801eee768e7aafc9c2fa2 # ratchet:actions/upload-artifact@v2
+        with:
+          name: harpoon
+          path: bin/harpoon
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download Artifact
+        uses: actions/download-artifact@cbed621e49e4c01b044d60f6c80ea4ed6328b281 # ratchet:actions/download-artifact@v2
+        with:
+          name: harpoon
+          path: ./
+      - name: Create Release
+        id: create_release
+        uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # ratchet:softprops/action-gh-release@v1
+        with:
+          files: |
+            harpoon
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/build.yaml

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+name: Build
+on:
+  push:
+    branches:
+      - 'main'
+permissions:
+  contents: write
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # ratchet:actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@bfdd3570ce990073878bf10f6b2d79082de49492 # ratchet:actions/setup-go@v2
+        with:
+          go-version: '1.20'
+      - name: Install BCC Dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y bpfcc-tools libbpfcc-dev  # Install BCC dependencies
+          sudo apt install -y libseccomp-dev            # Install Seccomp dependencies
+      - name: Build and Test
+        run: |-
+          make build-gh

.gitignore

@@ -0,0 +1 @@
+bin/

LICENSE

@@ -0,0 +1,203 @@
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+

Makefile

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+BINARY_NAME=harpoon
+BINARY_DIR=./bin
+
+build: create-bin-dir
+	go mod download
+	go build \
+		-v \
+		-o ${BINARY_DIR}/${BINARY_NAME} \
+		.
+
+build-gh: create-bin-dir
+ifndef GITHUB_REF_NAME
+	$(error GITHUB_REF_NAME is undefined)
+endif
+	go mod download
+	go build \
+		-v \
+		-ldflags="-s -w -X 'main.version=${GITHUB_REF_NAME}'" \
+		-o ${BINARY_DIR}/${BINARY_NAME} \
+		.
+
+create-bin-dir:
+	mkdir -p ${BINARY_DIR}
+
+clean:
+	rm -rf ./bin

README.md

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+# Harpoon
+
+<p align="center">
+    <img src="harpoon.png" alt="gopher" width="200"/>
+</p>
+
+**Harpoon** aims to capture the syscalls (as if they were fishes) from the execution flow (the river) of a single user-defined function.
+
+**N.B.** This is currently a PoC made for fun in my free time. Definitely, not a production grade project.
+
+## Introduction
+
+This tool is designed to provide fine-grained visibility into the syscalls made by specific functions within a program. Unlike traditional system call tracing tools like `strace`, which capture all syscalls made during the entire program's execution, this project leverages the power of **eBPF** to pinpoint and monitor system calls exclusively within targeted functions.
+
+## Getting Started
+
+First of all, identify the symbol of the function you want to trace from the binary. Let's suppose you want to trace the function `doSomething()` present in the example program `./binary`. In order to get the symbol from the binary itself, you need to use the following command:
+
+```sh
+objdump --syms ./binary | grep doSomething
+0000000000480720 g     F .text  0000000000000067 main.doSomething
+```
+
+So, `main.doSomething` is the symbol of the function we want to trace using `harpoon`.
+
+Then, let's run `harpoon` to extract the syscalls from the function `main.doSomething`:
+
+```sh
+harpoon -fn main.doSomething ./binary
+[+] start tracing
+[+] stop tracing
+read
+sigaltstack
+gettid
+close
+mmap
+fcntl
+write
+futex
+openat
+clone
+getrlimit
+```
+
+These are the syscalls that have been executed by the traced function!
+
+## Installation
+
+`harpoon` uses the [**bcc**](https://github.com/iovisor/bcc/blob/master/) project under the hood to run **eBPF**. In order to make it works, you'll have to install the **bcc** *build dependencies*, since it compiles **eBPF** code at runtime. To do so, please refer to this [page](https://github.com/iovisor/bcc/blob/master/INSTALL.md) looking at your own distribution.
+
+### Build
+
+Once you have all the needed tools to run `harpoon`, you can build it locally with:
+
+```sh
+make build
+```
+
+After the build is completed, you can find the executable under the `bin/` directory.
+
+### Download
+
+Alternatively, you can easily download the latest release from the dedicated [page](https://github.com/alegrey91/harpoon/releases/latest).
+
+## References
+
+I would like to point out that without the references mentioned below this project would never have come to life.
+As a result, the code draws significant inspiration from the references listed here:
+
+* https://www.grant.pizza/blog/tracing-go-functions-with-ebpf-part-1/
+* https://itnext.io/seccomp-in-kubernetes-part-2-crafting-custom-seccomp-profiles-for-your-applications-c28c658f676e
+* https://github.com/containers/oci-seccomp-bpf-hook
+* https://sysdig.com/blog/ebpf-offensive-capabilities/
+* *Liz Rice. Learning eBPF, 173-176. O'Reilly, 2023*
+