chore: support dynamically link against libpcap (#260)

Author: mozillazg

.github/workflows/test.yml

@@ -12,6 +12,33 @@ permissions:
 
 jobs:
 
+  build-with-dynamic-link:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+    - name: Set up Go
+      uses: actions/setup-go@f111f3307d8850f501ac008e886eec1fd1932a34 # v5
+      with:
+        # renovate: datasource=golang-version depName=golang
+        go-version: '1.23.6'
+
+    - name: Install Deps
+      run: |
+        sudo apt-get install -y gcc flex bison make libelf-dev autoconf libpcap-dev
+
+    - name: Build
+      run: |
+        make build-dynamic-link
+
+    - name: Test
+      run: |
+        file ./ptcpdump | grep 'dynamically linked'
+        ldd ./ptcpdump | grep 'libpcap.so'
+        sudo ./ptcpdump -i any -c 2
+
+
   build:
     runs-on: ubuntu-latest
     timeout-minutes: 5

Makefile

@@ -23,8 +23,10 @@ GOOS ?= $(shell go env GOOS)
 LDFLAGS := -linkmode "external" -extldflags "-static"
 LDFLAGS += -X github.com/mozillazg/ptcpdump/internal.Version=$(VERSION)
 LDFLAGS += -X github.com/mozillazg/ptcpdump/internal.GitCommit=$(GIT_COMMIT)
-COVERAGE_FLAG ?= ''
-COVERAGE_ARGS ?= ''
+LDFLAGS_DYNAMIC := -X github.com/mozillazg/ptcpdump/internal.Version=$(VERSION)
+LDFLAGS_DYNAMIC += -X github.com/mozillazg/ptcpdump/internal.GitCommit=$(GIT_COMMIT)
+COVERAGE_FLAG ?=
+COVERAGE_ARGS ?=
 
 CARCH ?= $(shell uname -m)
 LIBPCAP_ARCH = $(CARCH)-unknown-linux-gnu
@@ -62,6 +64,11 @@ build: libpcap
 	CGO_LDFLAGS=$(CGO_LDFLAGS_STATIC) \
 	CGO_ENABLED=1 go build -tags static -ldflags "$(LDFLAGS)" $(COVERAGE_FLAG)
 
+
+.PHONY: build-dynamic-link
+build-dynamic-link:
+	CGO_ENABLED=1 go build -tags dynamic -ldflags "$(LDFLAGS_DYNAMIC)" $(COVERAGE_FLAG)
+
 .PHONY: test
 test:
 	CGO_CFLAGS=$(CGO_CFLAGS_STATIC) \

go.mod

@@ -108,6 +108,8 @@ replace (
 	github.com/cilium/ebpf => github.com/mozillazg/ebpf v0.17.3-0.20250207013525-5746abfb2b20
 	// github.com/cilium/ebpf => ../../cilium/ebpf
 	github.com/gopacket/gopacket => github.com/mozillazg/gopacket v0.0.0-20241026043817-048341de5231
+
+	github.com/jschwinger233/elibpcap => github.com/mozillazg/elibpcap v0.0.0-20250314124526-312841a0730a
 	// github.com/gopacket/gopacket => ../../gopacket/gopacket
 	github.com/x-way/pktdump => github.com/mozillazg/pktdump v0.0.9-0.20241102131745-63c34f34f0d1
 	// github.com/x-way/pktdump => ../../x-way/pktdump

go.sum

@@ -116,8 +116,6 @@ github.com/josharian/native v0.0.0-20200817173448-b6b71def0850/go.mod h1:7X/rasw
 github.com/josharian/native v1.0.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
 github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
 github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
-github.com/jschwinger233/elibpcap v1.0.0 h1:UQuP3XT9orz26lW6DPTu9B9OBYirB57LmhPNGxQqU2U=
-github.com/jschwinger233/elibpcap v1.0.0/go.mod h1:fUmq00C6Pechtr089JDPhvIc6TxrbUHDlZ5QCYc9tJQ=
 github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
 github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
 github.com/jsimonetti/rtnetlink v0.0.0-20201009170750-9c6f07d100c1/go.mod h1:hqoO/u39cqLeBLebZ8fWdE96O7FxrAsRYhnVOdgHxok=
@@ -185,6 +183,8 @@ github.com/mozillazg/cri-client v0.31.0-alpha.0.0.20241019023238-87687176fd67 h1
 github.com/mozillazg/cri-client v0.31.0-alpha.0.0.20241019023238-87687176fd67/go.mod h1:pFm23AAi/gIlW9FGrWPTPnGe1xsyGHPFFO/zezc4w90=
 github.com/mozillazg/ebpf v0.17.3-0.20250207013525-5746abfb2b20 h1:DrBwhJyOCDIDLvzWcwpK2rj3OLCEIjK/EJdKkgtBQOc=
 github.com/mozillazg/ebpf v0.17.3-0.20250207013525-5746abfb2b20/go.mod h1:9X5VAsIOck/nCAp0+nCSVzub1Q7x+zKXXItTMYfNE+E=
+github.com/mozillazg/elibpcap v0.0.0-20250314124526-312841a0730a h1:mLZ2OOjxRLMDG0Ug2fhBeylG+ntdZOGEOjAW2QFtLO4=
+github.com/mozillazg/elibpcap v0.0.0-20250314124526-312841a0730a/go.mod h1:fUmq00C6Pechtr089JDPhvIc6TxrbUHDlZ5QCYc9tJQ=
 github.com/mozillazg/gopacket v0.0.0-20241026043817-048341de5231 h1:uvhf0oGPfJ24Lc5/N2ysh9sQc71Pog67zxKiLVS4/Qg=
 github.com/mozillazg/gopacket v0.0.0-20241026043817-048341de5231/go.mod h1:WnFrU1Xkf5lWKV38uKNR9+yYtppn+ZYzOyNqMeH4oNE=
 github.com/mozillazg/pktdump v0.0.9-0.20241102131745-63c34f34f0d1 h1:kVgiW9P9tfqPXrIU/ZKC8XwkhHkri3s439D+RqSpF6g=

vendor/github.com/jschwinger233/elibpcap/README.md

@@ -276,7 +276,7 @@ github.com/inconshreveable/mousetrap
 # github.com/josharian/native v1.1.0
 ## explicit; go 1.13
 github.com/josharian/native
-# github.com/jschwinger233/elibpcap v1.0.0
+# github.com/jschwinger233/elibpcap v1.0.0 => github.com/mozillazg/elibpcap v0.0.0-20250314124526-312841a0730a
 ## explicit; go 1.21.0
 github.com/jschwinger233/elibpcap
 # github.com/klauspost/compress v1.16.7
@@ -607,6 +607,7 @@ rsc.io/binaryregexp
 rsc.io/binaryregexp/syntax
 # github.com/cilium/ebpf => github.com/mozillazg/ebpf v0.17.3-0.20250207013525-5746abfb2b20
 # github.com/gopacket/gopacket => github.com/mozillazg/gopacket v0.0.0-20241026043817-048341de5231
+# github.com/jschwinger233/elibpcap => github.com/mozillazg/elibpcap v0.0.0-20250314124526-312841a0730a
 # github.com/x-way/pktdump => github.com/mozillazg/pktdump v0.0.9-0.20241102131745-63c34f34f0d1
 # k8s.io/cri-api => github.com/mozillazg/cri-api v0.32.0-alpha.1.0.20241019013855-3dc36f8743df
 # k8s.io/cri-client => github.com/mozillazg/cri-client v0.31.0-alpha.0.0.20241019023238-87687176fd67