diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..e218823 --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,43 @@ +name: Deploy Go Binaries + +on: + push: + tags: + - 'v*.*.*' + +permissions: + contents: write + id-token: write + attestations: write + +jobs: + deploy: + name: Deploy + runs-on: ubuntu-latest + steps: + - name: Check out code into the Go module directory + uses: actions/checkout@v4 + with: + fetch-depth: 0 + + - name: Setup Go + uses: actions/setup-go@v5 + with: + check-latest: true + go-version-file: 'go.mod' + + - name: Build + run: make dist + + - name: Generate artifact attestation + uses: actions/attest-build-provenance@v1 + with: + subject-path: bin/* + + - name: Upload Releases + uses: softprops/action-gh-release@v2 + if: startsWith(github.ref, 'refs/tags/') + with: + files: bin/* + draft: true + prerelease: false \ No newline at end of file diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml new file mode 100644 index 0000000..1c46a40 --- /dev/null +++ b/.github/workflows/test.yml @@ -0,0 +1,28 @@ +name: Run Tests + +on: push + +jobs: + tests: + name: Tests + runs-on: ubuntu-latest + steps: + - name: Check out code into the Go module directory + uses: actions/checkout@v4 + with: + fetch-depth: 0 + + - name: Setup Go + uses: actions/setup-go@v5 + with: + check-latest: true + go-version-file: 'go.mod' + + # cf. https://ubuntu.com/blog/ubuntu-23-10-restricted-unprivileged-user-namespaces + - name: Allow Unconfined NS + run: | + sudo sysctl -w kernel.apparmor_restrict_unprivileged_unconfined=0 + sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0 + + - name: Run Tests + run: make test \ No newline at end of file diff --git a/.gitignore b/.gitignore index 0a22ca1..47970b3 100644 --- a/.gitignore +++ b/.gitignore @@ -15,3 +15,6 @@ bin/* *.bc *.o *.s + +# Build +/slirpnetstack diff --git a/Makefile b/Makefile index 9054f91..6c25862 100644 --- a/Makefile +++ b/Makefile @@ -1,9 +1,18 @@ +BINARY := slirpnetstack + export GOPRIVATE := code.cfops.it IMPORT_PATH := github.com/cloudflare/slirpnetstack -VERSION := $(shell git describe --tags --always --dirty="-dev") -DATE := $(shell date -u '+%Y-%m-%d-%H:%MUTC') -GOFLAGS := -ldflags='-compressdwarf=false -X "$(IMPORT_PATH)/ext.Version=$(VERSION)" -X "$(IMPORT_PATH)/ext.BuildTime=$(DATE)"' +VERSION := $(shell git describe --tags --always --dirty="-dev") +DATE := $(shell date -u '+%Y-%m-%d-%H:%MUTC') +GOFLAGS := -ldflags='-X "$(IMPORT_PATH)/ext.Version=$(VERSION)" -X "$(IMPORT_PATH)/ext.BuildTime=$(DATE)"' +BUILD_DIR := bin + +GO_BUILD = go build $(GOFLAGS) + +LINUX_ARCH_LIST = \ + linux-amd64 \ + linux-arm64 bin/slirpnetstack: *.go go.mod go build \ @@ -80,3 +89,13 @@ update-gomod: go get -u gvisor.dev/gvisor@go all go mod tidy $(MAKE) bin/gocovmerge bin/slirpnetstack bin/slirpnetstack.cover + + +### Distribution section ### +dist: $(LINUX_ARCH_LIST) + +linux-amd64: + GOARCH=amd64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@ + +linux-arm64: + GOARCH=arm64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@ \ No newline at end of file diff --git a/README.md b/README.md index 4536ddd..5d4b47e 100644 --- a/README.md +++ b/README.md @@ -197,7 +197,7 @@ Development You can run tests with: - make tests + make test Or tests with code coverage diff --git a/addr.go b/addr.go index d24a4ae..4ab17ee 100644 --- a/addr.go +++ b/addr.go @@ -10,21 +10,22 @@ import ( "gvisor.dev/gvisor/pkg/tcpip" ) -/* SSH supports this syntax: +/* + SSH supports this syntax: + -R ... connections to given TCP port ... on the remote host are to be forwarded to the local side... -L ... on the local host are to be forwarded to the given port... on the remote side... - -L [bind_address:]port:host:hostport - -R [bind_address:]port:host:hostport - -R [bind_address:]port - - -L [bind_address:]port:remote_socket - -L local_socket:remote_socket - -L local_socket:host:hostport - -R [bind_address:]port:local_socket - -R remote_socket:host:hostport - -R remote_socket:local_socket + -L [bind_address:]port:host:hostport + -R [bind_address:]port:host:hostport + -R [bind_address:]port + -L [bind_address:]port:remote_socket + -L local_socket:remote_socket + -L local_socket:host:hostport + -R [bind_address:]port:local_socket + -R remote_socket:host:hostport + -R remote_socket:local_socket */ type FwdAddr struct { network string @@ -133,8 +134,7 @@ func (f *FwdAddrSlice) Set(value string) error { func (f *FwdAddrSlice) SetDefaultAddrs(bindAddrDef net.IP, bindAddr6Def net.IP, hostAddrDef net.IP, hostAddr6Def net.IP) { for i := range *f { fa := &(*f)[i] - if (fa.bind.static.Addr != "" && fa.bind.static.Addr.To4() == "") || - (fa.host.static.Addr != "" && fa.host.static.Addr.To4() == "") { + if fa.bind.static.Addr.Len() == 16 || fa.host.static.Addr.Len() == 16 { // Bind and/or host is IPv6 fa.bind.SetDefaultAddr(bindAddr6Def) fa.host.SetDefaultAddr(hostAddr6Def) @@ -182,16 +182,24 @@ func (f *FwdAddr) HostAddr() (net.Addr, error) { return nil, fmt.Errorf("unknown network type: %v", f.network) } +func ipToSmallestSlice(ip net.IP) []byte { + ip4 := ip.To4() + if ip4 != nil { + return ip4 + } + return ip +} + func FullAddressFromAddr(a net.Addr) *tcpip.FullAddress { switch v := a.(type) { case *net.TCPAddr: return &tcpip.FullAddress{ - Addr: tcpip.Address(v.IP), + Addr: tcpip.AddrFromSlice(ipToSmallestSlice(v.IP)), Port: uint16(v.Port), } case *net.UDPAddr: return &tcpip.FullAddress{ - Addr: tcpip.Address(v.IP), + Addr: tcpip.AddrFromSlice(ipToSmallestSlice(v.IP)), Port: uint16(v.Port), } } @@ -233,6 +241,7 @@ func netAddrSetPort(a net.Addr, port int) net.Addr { } // Addr that can be set from flag.Var. For example: +// // flag.Var(&metricAddr, "m", "Metrics address") type AddrFlags struct { net.Addr diff --git a/fwd.go b/fwd.go index ceae429..9124111 100644 --- a/fwd.go +++ b/fwd.go @@ -155,7 +155,7 @@ func LocalForward(state *State, s *stack.Stack, conn KaConn, targetAddr net.Addr // connection had routable IP (unlike // 127.0.0.1)... well... spoof it! The client might find it // useful who launched the connection in the first place. - if proxyProtocol == false { + if !proxyProtocol { srcIP = conn.RemoteAddr() } else { ppPrefix = "PP " @@ -163,8 +163,8 @@ func LocalForward(state *State, s *stack.Stack, conn KaConn, targetAddr net.Addr } // If the source IP as reported by PP or the client is not routable, still forward // connection. Just don't use/leak the original IP. - var isSourcev4 = FullAddressFromAddr(srcIP).Addr.To4() != "" - var isTargetv4 = FullAddressFromAddr(targetAddr).Addr.To4() != "" + var isSourcev4 = FullAddressFromAddr(srcIP).Addr.Len() == 4 + var isTargetv4 = FullAddressFromAddr(targetAddr).Addr.Len() == 4 if IPNetContains(state.StaticRoutingDeny, netAddrIP(srcIP)) || isSourcev4 != isTargetv4 { // Source IP not rewritten because: // * static routing deny @@ -251,5 +251,4 @@ pperror: err) } conn.Close() - return } diff --git a/go.mod b/go.mod index aa001e0..11ba6f2 100644 --- a/go.mod +++ b/go.mod @@ -1,28 +1,30 @@ module github.com/cloudflare/slirpnetstack -go 1.13 +go 1.23.0 require ( - github.com/bazelbuild/rules_go v0.25.0 // indirect + github.com/miekg/dns v1.1.52 + github.com/opencontainers/runc v1.2.0 + github.com/opencontainers/runtime-spec v1.2.0 + github.com/vishvananda/netlink v1.2.1-beta.2 + golang.org/x/sys v0.28.0 + gopkg.in/netaddr.v1 v1.5.1 + gvisor.dev/gvisor v0.0.0-20240629121841-891b40cf7fe0 +) + +require ( + github.com/bazelbuild/rules_go v0.44.2 // indirect github.com/cenkalti/backoff v2.2.1+incompatible // indirect - github.com/golang/protobuf v1.4.3 // indirect - github.com/google/go-cmp v0.5.4 // indirect - github.com/kr/text v0.2.0 // indirect - github.com/miekg/dns v1.1.35 + github.com/google/btree v1.1.2 // indirect github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect - github.com/opencontainers/runc v0.1.1 - github.com/opencontainers/runtime-spec v1.0.2 - github.com/stretchr/testify v1.6.1 // indirect + github.com/sirupsen/logrus v1.9.3 // indirect + github.com/stretchr/testify v1.8.2 // indirect github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 // indirect - github.com/vishvananda/netlink v1.1.0 - github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad // indirect - golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c // indirect - golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb // indirect - golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 // indirect - golang.org/x/sys v0.0.0-20201202213521-69691e467435 - golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e // indirect - gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect - gopkg.in/netaddr.v1 v1.4.0 - gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect - gvisor.dev/gvisor v0.0.0-20201204040109-0ba39926c86f + github.com/vishvananda/netns v0.0.4 // indirect + golang.org/x/exp v0.0.0-20230725093048-515e97ebf090 // indirect + golang.org/x/mod v0.14.0 // indirect + golang.org/x/net v0.33.0 // indirect + golang.org/x/time v0.5.0 // indirect + golang.org/x/tools v0.16.1 // indirect + google.golang.org/protobuf v1.34.2 // indirect ) diff --git a/go.sum b/go.sum index 7caa4e6..accd7eb 100644 --- a/go.sum +++ b/go.sum @@ -1,442 +1,66 @@ -bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8= -cloud.google.com/go v0.26.0/go.mod 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"golang.org/x/sys/unix" "net" "sync" "syscall" "time" + + "golang.org/x/sys/unix" ) type KaConn interface { @@ -92,7 +93,7 @@ func (c *KaUDPConn) Read(buf []byte) (int, error) { c.Conn.SetReadDeadline(t) n, err := c.Conn.Read(buf) - if ne, ok := err.(net.Error); ok == true && ne.Timeout() { + if ne, ok := err.(net.Error); ok && ne.Timeout() { // On Keepalive raise special error return 0, &UDPKeepAliveError{err} } else { diff --git a/main.go b/main.go index e64c8a7..ebcbec9 100644 --- a/main.go +++ b/main.go @@ -1,6 +1,7 @@ package main import ( + _ "embed" "flag" "fmt" "math/rand" @@ -22,8 +23,12 @@ import ( "gvisor.dev/gvisor/pkg/tcpip/transport/udp" ) +//go:embed LICENSE-BSD-Cloudflare +var license string + var ( cmdVersion bool + cmdLicense bool fd int netNsPath string ifName string @@ -43,10 +48,13 @@ var ( allowRange IPPortRangeSlice denyRange IPPortRangeSlice dnsTTL time.Duration + readyFile string + fwmark int ) func initFlagSet(flag *flag.FlagSet) { flag.BoolVar(&cmdVersion, "version", false, "Print slirpnetstack version and exit") + flag.BoolVar(&cmdLicense, "license", false, "Print slirpnetstack license and exit") flag.IntVar(&fd, "fd", -1, "Unix datagram socket file descriptor") flag.StringVar(&netNsPath, "netns", "", "path to network namespace") flag.StringVar(&ifName, "interface", "tun0", "interface name within netns") @@ -65,6 +73,8 @@ func initFlagSet(flag *flag.FlagSet) { flag.Var(&allowRange, "allow", "When routing, allow specified IP prefix and port range") flag.Var(&denyRange, "deny", "When routing, deny specified IP prefix and port range") flag.DurationVar(&dnsTTL, "dns-ttl", time.Duration(5*time.Second), "For how long to cache DNS in case of dns labels passed to forward target.") + flag.StringVar(&readyFile, "ready-file", "", "After initialization, write a byte to this file to signal readiness") + flag.IntVar(&fwmark, "fwmark", 0, "Set fwmark on outbound packets") } func main() { @@ -91,6 +101,8 @@ type State struct { denyRange IPPortRangeSlice srcIPs SrcIPs + + fwmark int } func Main(programName string, args []string) int { @@ -144,6 +156,11 @@ func Main(programName string, args []string) int { return 0 } + if cmdLicense { + fmt.Printf("slirpnetstack license: %s\n", license) + return 0 + } + if gomaxprocs > 0 { runtime.GOMAXPROCS(gomaxprocs) } @@ -157,6 +174,7 @@ func Main(programName string, args []string) int { state.srcIPs.srcIPv6 = sourceIPv6.ip state.allowRange = allowRange state.denyRange = denyRange + state.fwmark = fwmark logConnections = !quiet @@ -324,13 +342,26 @@ func Main(programName string, args []string) int { fmt.Fprintf(os.Stderr, "[+] #%d Slirpnetstack started\n", pid) syscall.Kill(syscall.Getppid(), syscall.SIGWINCH) - for { - select { - case sig := <-sigCh: - signal.Reset(sig) - fmt.Fprintf(os.Stderr, "[-] #%d Slirpnetstack closing\n", pid) - goto stop + if readyFile != "" { + file, err := os.OpenFile(readyFile, os.O_WRONLY, 0) + if err != nil { + fmt.Fprintf(os.Stderr, "[!] Failed to open readiness file: %s\n", err) + return -11 + } + _, err = file.Write([]byte{1}) + if err != nil { + _ = file.Close() + fmt.Fprintf(os.Stderr, "[!] Failed to write byte to readiness file: %s\n", err) + return -12 } + _ = file.Close() + } + + for { + sig := <-sigCh + signal.Reset(sig) + fmt.Fprintf(os.Stderr, "[-] #%d Slirpnetstack closing\n", pid) + goto stop } stop: // TODO: define semantics of graceful close on signal diff --git a/main_test.go b/main_test.go index d7b7fc5..3a243e2 100644 --- a/main_test.go +++ b/main_test.go @@ -1,3 +1,4 @@ +//go:build testrunmain // +build testrunmain package main diff --git a/net.go b/net.go index a5c5c2f..829a6c0 100644 --- a/net.go +++ b/net.go @@ -7,6 +7,7 @@ import ( "strconv" "strings" "sync" + "syscall" "time" "gvisor.dev/gvisor/pkg/tcpip" @@ -60,7 +61,7 @@ func netParseIP(h string) net.IP { return ip } -// Deferrred Address. Either just an ip, in which case 'static' is +// Deferred Address. Either just an ip, in which case 'static' is // filled and we are done, or something we need to retrieve from DNS. type defAddress struct { sync.Mutex @@ -78,7 +79,7 @@ func ParseDefAddress(ipS string, portS string) (_da *defAddress, _err error) { if ipS != "" { if ip := netParseIP(ipS); ip != nil { // ipS is an IP literal - da.static.Addr = tcpip.Address(ip) + da.static.Addr = tcpip.AddrFromSlice(ip) } else { // ipS is a hostname to resolve later da.label = ipS @@ -97,16 +98,10 @@ func ParseDefAddress(ipS string, portS string) (_da *defAddress, _err error) { return da, nil } -func (da *defAddress) SetDefaultAddr(a net.IP) { - if da.static.Addr == "" { - da.static.Addr = tcpip.Address(a) - } -} - func (da *defAddress) Retrieve() *tcpip.FullAddress { da.Lock() defer da.Unlock() - if da.label == "" || time.Now().Sub(da.fetched) <= dnsTTL { + if da.label == "" || time.Since(da.fetched) <= dnsTTL { return &da.static } da.fetched = time.Now() @@ -117,7 +112,7 @@ func (da *defAddress) Retrieve() *tcpip.FullAddress { da.error = err return nil } else { - da.static.Addr = tcpip.Address(ip) + da.static.Addr = tcpip.AddrFromSlice(ip) if port != 0 { da.static.Port = uint16(port) } @@ -126,12 +121,18 @@ func (da *defAddress) Retrieve() *tcpip.FullAddress { return &da.static } +func (da *defAddress) SetDefaultAddr(a net.IP) { + if da.static.Addr.Len() == 0 { + da.static.Addr = tcpip.AddrFromSlice(a) + } +} + func (da *defAddress) String() string { static := da.Retrieve() if static == nil { return fmt.Sprintf("%s-failed", da.label) } - return fmt.Sprintf("%s:%d", net.IP(da.static.Addr).String(), da.static.Port) + return fmt.Sprintf("%s:%d", da.static.Addr.String(), da.static.Port) } func (da *defAddress) GetTCPAddr() *net.TCPAddr { @@ -141,7 +142,7 @@ func (da *defAddress) GetTCPAddr() *net.TCPAddr { } return &net.TCPAddr{ - IP: net.IP(static.Addr), + IP: static.Addr.AsSlice(), Port: int(static.Port), } } @@ -153,7 +154,7 @@ func (da *defAddress) GetUDPAddr() *net.UDPAddr { } return &net.UDPAddr{ - IP: net.IP(static.Addr), + IP: static.Addr.AsSlice(), Port: int(static.Port), } } @@ -165,7 +166,7 @@ func simpleLookupHost(resolver *net.Resolver, label string) (net.IP, error) { return nil, err } if len(addrs) < 1 { - return nil, fmt.Errorf("Empty dns reponse for %q", label) + return nil, fmt.Errorf("empty dns reponse for %q", label) } // prefer IPv4. No real reason. @@ -178,7 +179,7 @@ func simpleLookupHost(resolver *net.Resolver, label string) (net.IP, error) { ip := netParseIP(addrs[0]) if ip == nil { - return nil, fmt.Errorf("Empty dns reponse for %q", label) + return nil, fmt.Errorf("empty dns reponse for %q", label) } return ip, nil } @@ -189,7 +190,7 @@ func FullResolve(label string) (net.IP, uint16, error) { if len(p) == 2 { srvQuery, dnsSrv := p[0], p[1] if !strings.HasPrefix(dnsSrv, "srv-") { - return nil, 0, fmt.Errorf("Unknown dns type %q", dnsSrv) + return nil, 0, fmt.Errorf("unknown dns type %q", dnsSrv) } dnsSrvAddr := dnsSrv[4:] @@ -207,16 +208,14 @@ func FullResolve(label string) (net.IP, uint16, error) { } _, srvAddrs, err := r.LookupSRV(context.Background(), "", "", srvQuery) if err != nil || len(srvAddrs) == 0 { - return nil, 0, fmt.Errorf("Failed to lookup SRV %q on %q", srvQuery, dnsSrvAddr) + return nil, 0, fmt.Errorf("failed to lookup SRV %q on %q", srvQuery, dnsSrvAddr) } // For effective resolution, allowing to utilize // /etc/hosts, trim the trailing dot if present. serviceLabel := srvAddrs[0].Target servicePort := srvAddrs[0].Port - if strings.HasSuffix(serviceLabel, ".") { - serviceLabel = serviceLabel[:len(serviceLabel)-1] - } + serviceLabel = strings.TrimSuffix(serviceLabel, ".") ip, err := simpleLookupHost(r, serviceLabel) if err == nil && ip != nil { @@ -245,8 +244,22 @@ func netParseOrResolveIP(h string) (_ip net.IP, _resolved bool, _err error) { return ip, true, err } -func OutboundDial(srcIPs *SrcIPs, dst net.Addr) (net.Conn, error) { +func OutboundDial(state *State, dst net.Addr) (net.Conn, error) { + srcIPs := &state.srcIPs network := dst.Network() + dialer := &net.Dialer{} + if state.fwmark != 0 { + dialer.Control = func(network, address string, c syscall.RawConn) error { + var controlErr error + err := c.Control(func(fd uintptr) { + controlErr = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, state.fwmark) + }) + if err != nil { + return err + } + return controlErr + } + } if network == "tcp" { dstTcp := dst.(*net.TCPAddr) var srcTcp *net.TCPAddr @@ -256,7 +269,8 @@ func OutboundDial(srcIPs *SrcIPs, dst net.Addr) (net.Conn, error) { if srcIPs != nil && dstTcp.IP.To4() == nil && srcIPs.srcIPv6 != nil { srcTcp = &net.TCPAddr{IP: srcIPs.srcIPv6} } - return net.DialTCP(network, srcTcp, dstTcp) + dialer.LocalAddr = srcTcp + return dialer.Dial(network, dstTcp.String()) } if network == "udp" { dstUdp := dst.(*net.UDPAddr) @@ -267,7 +281,8 @@ func OutboundDial(srcIPs *SrcIPs, dst net.Addr) (net.Conn, error) { if srcIPs != nil && dstUdp.IP.To4() == nil && srcIPs.srcIPv6 != nil { srcUdp = &net.UDPAddr{IP: srcIPs.srcIPv6} } - return net.DialUDP(network, srcUdp, dstUdp) + dialer.LocalAddr = srcUdp + return dialer.Dial(network, dstUdp.String()) } return nil, fmt.Errorf("not tcp/udp") } diff --git a/proxy.go b/proxy.go index 0f28669..d4487bb 100644 --- a/proxy.go +++ b/proxy.go @@ -154,7 +154,7 @@ func connSplice(local KaConn, remote KaConn, sppHeader []byte) ProxyError { proxyOneFlow(remote, local, &pe.RemoteRead, &pe.LocalWrite, doneCh, 1, sppHeader) first := <-doneCh - _ = <-doneCh + <-doneCh switch { case first == 0 && pe.LocalRead != nil: pe.First = 0 diff --git a/routing.go b/routing.go index 714a013..547ed6f 100644 --- a/routing.go +++ b/routing.go @@ -54,14 +54,14 @@ func UdpRoutingHandler(s *stack.Stack, state *State) func(*udp.ForwarderRequest) } rf, ok := state.remoteUdpFwd[loc.String()] - if ok == false { + if !ok { if block := FirewallRoutingBlock(state, loc); block { ep.Close() return } } - xconn := gonet.NewUDPConn(s, &wq, ep) + xconn := gonet.NewUDPConn(&wq, ep) conn := &KaUDPConn{Conn: xconn} if rf != nil && rf.kaEnable && rf.kaInterval == 0 { @@ -70,9 +70,9 @@ func UdpRoutingHandler(s *stack.Stack, state *State) func(*udp.ForwarderRequest) go func() { if rf != nil { - RemoteForward(conn, &state.srcIPs, rf) + RemoteForward(conn, state, rf) } else { - RoutingForward(conn, &state.srcIPs, loc) + RoutingForward(conn, state, loc) } }() } @@ -88,7 +88,7 @@ func TcpRoutingHandler(state *State) func(*tcp.ForwarderRequest) { } rf, ok := state.remoteTcpFwd[loc.String()] - if ok == false { + if !ok { if block := FirewallRoutingBlock(state, loc); block { // In theory we could pass a bit of // data to the guest here. Like: @@ -118,22 +118,22 @@ func TcpRoutingHandler(state *State) func(*tcp.ForwarderRequest) { go func() { if rf != nil { - RemoteForward(conn, &state.srcIPs, rf) + RemoteForward(conn, state, rf) } else { - RoutingForward(conn, &state.srcIPs, loc) + RoutingForward(conn, state, loc) } }() } return h } -func RoutingForward(guest KaConn, srcIPs *SrcIPs, loc net.Addr) { +func RoutingForward(guest KaConn, state *State, loc net.Addr) { // Cache guest.RemoteAddr() because it becomes nil on // guest.Close(). guestRemoteAddr := guest.RemoteAddr() var pe ProxyError - xhost, err := OutboundDial(srcIPs, loc) + xhost, err := OutboundDial(state, loc) if err != nil { SetResetOnClose(guest) guest.Close() @@ -173,7 +173,7 @@ func RoutingForward(guest KaConn, srcIPs *SrcIPs, loc net.Addr) { } } -func RemoteForward(guest KaConn, srcIPs *SrcIPs, rf *FwdAddr) { +func RemoteForward(guest KaConn, state *State, rf *FwdAddr) { // Cache guest.RemoteAddr() because it becomes nil on // guest.Close(). guestRemoteAddr := guest.RemoteAddr() @@ -190,7 +190,7 @@ func RemoteForward(guest KaConn, srcIPs *SrcIPs, rf *FwdAddr) { err) return } - xhost, err := OutboundDial(srcIPs, hostAddr) + xhost, err := OutboundDial(state, hostAddr) if err != nil { SetResetOnClose(guest) guest.Close() diff --git a/stack.go b/stack.go index e35f739..89cddab 100644 --- a/stack.go +++ b/stack.go @@ -7,10 +7,10 @@ import ( "os" "time" + "gvisor.dev/gvisor/pkg/rawfile" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/adapters/gonet" "gvisor.dev/gvisor/pkg/tcpip/link/fdbased" - "gvisor.dev/gvisor/pkg/tcpip/link/rawfile" "gvisor.dev/gvisor/pkg/tcpip/link/tun" "gvisor.dev/gvisor/pkg/tcpip/network/arp" "gvisor.dev/gvisor/pkg/tcpip/network/ipv4" @@ -91,8 +91,8 @@ func NewStack(rcvBufferSize, sndBufferSize int) *stack.Stack { } s := stack.New(opts) - s.SetForwarding(ipv4.ProtocolNumber, true) - s.SetForwarding(ipv6.ProtocolNumber, true) + s.SetForwardingDefaultAndAllNICs(ipv4.ProtocolNumber, true) + s.SetForwardingDefaultAndAllNICs(ipv6.ProtocolNumber, true) { opt := tcpip.TCPSACKEnabled(true) @@ -126,7 +126,7 @@ func NewStack(rcvBufferSize, sndBufferSize int) *stack.Stack { return s } -func createLinkEP(s *stack.Stack, tunFd int, tapMode bool, macAddress net.HardwareAddr, tapMtu uint32) (stack.LinkEndpoint, error) { +func createLinkEP(_ *stack.Stack, tunFd int, tapMode bool, macAddress net.HardwareAddr, tapMtu uint32) (stack.LinkEndpoint, error) { parms := fdbased.Options{FDs: []int{tunFd}, MTU: tapMtu, RXChecksumOffload: true, @@ -157,7 +157,7 @@ func createNIC(s *stack.Stack, nic tcpip.NICID, linkEP stack.LinkEndpoint) error } func MustSubnet(ipNet *net.IPNet) *tcpip.Subnet { - subnet, errx := tcpip.NewSubnet(tcpip.Address(ipNet.IP), tcpip.AddressMask(ipNet.Mask)) + subnet, errx := tcpip.NewSubnet(tcpip.AddrFromSlice(ipNet.IP), tcpip.MaskFromBytes(ipNet.Mask)) if errx != nil { panic(fmt.Sprintf("Unable to MustSubnet(%s): %s", ipNet, errx)) } @@ -171,9 +171,15 @@ func StackRoutingSetup(s *stack.Stack, nic tcpip.NICID, assignNet string) { } if ipAddr.To4() != nil { - s.AddAddress(nic, ipv4.ProtocolNumber, tcpip.Address(ipAddr.To4())) + s.AddProtocolAddress(nic, tcpip.ProtocolAddress{ + Protocol: ipv4.ProtocolNumber, + AddressWithPrefix: tcpip.AddrFromSlice(ipAddr.To4()).WithPrefix(), + }, stack.AddressProperties{}) } else { - s.AddAddress(nic, ipv6.ProtocolNumber, tcpip.Address(ipAddr)) + s.AddProtocolAddress(nic, tcpip.ProtocolAddress{ + Protocol: ipv6.ProtocolNumber, + AddressWithPrefix: tcpip.AddrFromSlice(ipAddr).WithPrefix(), + }, stack.AddressProperties{}) } rt := s.GetRouteTable() @@ -189,8 +195,8 @@ func StackPrimeArp(s *stack.Stack, nic tcpip.NICID, ip net.IP) { // address" on first write. if ip.To4() != nil { s.GetLinkAddress(nic, - tcpip.Address(ip.To4()), - "", + tcpip.AddrFromSlice(ip.To4()), + tcpip.AddrFromSlice([]byte{}), ipv4.ProtocolNumber, nil) } @@ -215,15 +221,13 @@ func GonetDialTCP(s *stack.Stack, laddr, raddr *tcpip.FullAddress, network tcpip // Create wait queue entry that notifies a channel. // // We do this unconditionally as Connect will always return an error. - waitEntry, notifyCh := waiter.NewChannelEntry(nil) - wq.EventRegister(&waitEntry, waiter.EventOut) + waitEntry, notifyCh := waiter.NewChannelEntry(waiter.EventOut) + wq.EventRegister(&waitEntry) defer wq.EventUnregister(&waitEntry) err = ep.Connect(*raddr) - if err == tcpip.ErrConnectStarted { - select { - case <-notifyCh: - } + if _, ok := err.(*tcpip.ErrConnectStarted); ok { + <-notifyCh err = ep.LastError() } diff --git a/tests/test_basic.py b/tests/test_basic.py index 37d346e..a35e573 100644 --- a/tests/test_basic.py +++ b/tests/test_basic.py @@ -1,6 +1,7 @@ from . import base from . import utils import os +import shutil import socket import struct import unittest @@ -50,10 +51,12 @@ def test_pcap(self): caught_sizes = set() with open(pcap, 'rb') as f: data = f.read(24) - header = struct.unpack(">LHHLLLL", data) + endianness = "<" if struct.unpack("" + header = struct.unpack("%sLHHLLLL" % endianness, data) + self.assertEqual(header[0], 0xa1b2c3d4) data = f.read(16) - (seconds, useconds, captured_length, packet_length) = struct.unpack(">LLLL", data) + (seconds, useconds, captured_length, packet_length) = struct.unpack("%sLLLL" % endianness, data) # we generally expect icmp echo request at 28 bytes, but # sometimes see some other packet at 76 bytes (arp?) caught_sizes.add( captured_length ) @@ -118,16 +121,20 @@ def test_basic_ping6(self): p = self.prun() self.assertStartSync(p) with self.guest_netns(): + # ping6 may not be present on some systems. + ping_cmd = shutil.which("ping6") + if ping_cmd is None: + ping_cmd = "ping" # ping local address. sanity. This is kinda tricky. First, # tuntap must be enabled (ie: someone must pick up the # fd). Then the ip needs to have 'nodad' toggle, to # prevent it from stalling on duplicate address detection. - r = os.system("ping6 -q 2001:2::2 -c 1 -n > /dev/null") + r = os.system("%s -q 2001:2::2 -c 1 -n > /dev/null" % ping_cmd) self.assertEqual(r, 0) - r = os.system("ping6 -q 2001:2::100 -c 1 -n > /dev/null") + r = os.system("%s -q 2001:2::100 -c 1 -n > /dev/null" % ping_cmd) self.assertEqual(r, 0) # 1.1.1.1 resolver. Doesn't matter - will be terminated by netstack - r = os.system("ping6 -q 2606:4700:4700::1111 -c 1 -n > /dev/null") + r = os.system("%s -q 2606:4700:4700::1111 -c 1 -n > /dev/null" % ping_cmd) self.assertEqual(r, 0) def test_metric(self): @@ -233,10 +240,12 @@ def test_udp_large_packet(self): self.assertStartSync(p) with self.guest_netns(): s = utils.connect(port=echo_port, ip="192.168.1.100", udp=True) - a = s.send(b"a"*16385) + s.send(b"a"*16385) s.sendall(b"a"*(65535-28)) - self.assertEqual(16385, len(s.recv(64*1024))) - self.assertEqual(65507, len(s.recv(64*1024))) + lengths = [16385, 65507] + while len(lengths) > 0: + data = s.recv(64*1024) + lengths.remove(len(data)) s.close() @@ -1036,7 +1045,7 @@ def test_remote_srv_withut_dns(self): p = self.prun("-dns-ttl=0 -R=tcp://tcp.echo.server@srv-%d:0::2222" % (dns_port, )) self.assertIn("Joininig", p.stderr_line()) self.assertIn("Opening tun ", p.stderr_line()) - self.assertIn('[!] Failed to resolve bind address. dns lookup error of tcp addr: Failed to lookup SRV "tcp.echo.server"', p.stderr_line()) + self.assertIn('[!] Failed to resolve bind address. dns lookup error of tcp addr: failed to lookup SRV "tcp.echo.server"', p.stderr_line()) p.close() self.assertEqual(p.rc, 246, "exit code should be 246")