m/test/launch/cluster: add pcap dump
Dump all network traffic by default to help debug failed tests.
Change-Id: I5466639fa00501373690bd95452b85b61fb5b172
Reviewed-on: https://review.monogon.dev/c/monogon/+/1076
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Leopold Schabel <leo@monogon.tech>
diff --git a/metropolis/test/launch/cluster/cluster.go b/metropolis/test/launch/cluster/cluster.go
index 18cab25..bd71f06 100644
--- a/metropolis/test/launch/cluster/cluster.go
+++ b/metropolis/test/launch/cluster/cluster.go
@@ -16,6 +16,7 @@
"net"
"os"
"os/exec"
+ "path"
"path/filepath"
"syscall"
"time"
@@ -60,6 +61,10 @@
// configurations.
ConnectToSocket *os.File
+ // When PcapDump is set, all traffic is dumped to a pcap file in the
+ // runtime directory (e.g. "net0.pcap" for the first interface).
+ PcapDump bool
+
// SerialPort is an io.ReadWriter over which you can communicate with the serial
// port of the machine. It can be set to an existing file descriptor (like
// os.Stdout/os.Stderr) or any Go structure implementing this interface.
@@ -293,6 +298,19 @@
qemuArgs = append(qemuArgs, "-fw_cfg", "name=dev.monogon.metropolis/parameters.pb,file="+parametersPath)
}
+ if options.PcapDump {
+ var qemuNetDump launch.QemuValue
+ pcapPath := filepath.Join(r.ld, "net0.pcap")
+ if options.PcapDump {
+ qemuNetDump = launch.QemuValue{
+ "id": {"net0"},
+ "netdev": {"net0"},
+ "file": {pcapPath},
+ }
+ }
+ qemuArgs = append(qemuArgs, "-object", qemuNetDump.ToOption("filter-dump"))
+ }
+
// Start TPM emulator as a subprocess
tpmCtx, tpmCancel := context.WithCancel(options.Runtime.ctxT)
defer tpmCancel()
@@ -653,6 +671,7 @@
},
},
SerialPort: newPrefixedStdio(0),
+ PcapDump: true,
}
// Start the first node.
@@ -681,6 +700,7 @@
ExtraNetworkInterfaces: switchPorts,
PortMap: portMap,
SerialPort: newPrefixedStdio(99),
+ PcapDump: path.Join(ld, "nanoswitch.pcap"),
}); err != nil {
if !errors.Is(err, ctxT.Err()) {
log.Fatalf("Failed to launch nanoswitch: %v", err)
diff --git a/metropolis/test/launch/launch.go b/metropolis/test/launch/launch.go
index daf2f4b..e8df009 100644
--- a/metropolis/test/launch/launch.go
+++ b/metropolis/test/launch/launch.go
@@ -170,6 +170,10 @@
// that is normally the first network interface. If this is set PortMap is ignored.
// Mostly useful for speeding up QEMU's startup time for tests.
DisableHostNetworkInterface bool
+
+ // PcapDump can be used to dump all network traffic to a pcap file.
+ // If unset, no dump is created.
+ PcapDump string
}
// RunMicroVM launches a tiny VM mostly intended for testing. Very quick to boot
@@ -257,6 +261,15 @@
"-device", "virtio-net-device,netdev=usernet0,mac="+HostInterfaceMAC.String())
}
+ if !opts.DisableHostNetworkInterface && opts.PcapDump != "" {
+ qemuNetDump := QemuValue{
+ "id": {"usernet0"},
+ "netdev": {"usernet0"},
+ "file": {opts.PcapDump},
+ }
+ extraArgs = append(extraArgs, "-object", qemuNetDump.ToOption("filter-dump"))
+ }
+
var stdErrBuf bytes.Buffer
cmd := exec.CommandContext(ctx, "qemu-system-x86_64", append(baseArgs, extraArgs...)...)
cmd.Stdout = opts.SerialPort