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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| package tun | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/sagernet/sing/common/logger" | ||
| ) | ||
|
|
||
| type AutoRedirect interface { | ||
| Start() error | ||
| Close() error | ||
| } | ||
|
|
||
| type AutoRedirectOptions struct { | ||
| TunOptions *Options | ||
| Context context.Context | ||
| Handler Handler | ||
| Logger logger.Logger | ||
| TableName string | ||
| DisableNFTables bool | ||
| CustomRedirectPort func() int | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,227 @@ | ||
| //go:build linux | ||
|
|
||
| package tun | ||
|
|
||
| import ( | ||
| "net/netip" | ||
| "os/exec" | ||
| "strings" | ||
|
|
||
| E "github.com/sagernet/sing/common/exceptions" | ||
| F "github.com/sagernet/sing/common/format" | ||
|
|
||
| "golang.org/x/sys/unix" | ||
| ) | ||
|
|
||
| func (r *autoRedirect) iptablesPathForFamily(family int) string { | ||
| if family == unix.AF_INET { | ||
| return r.iptablesPath | ||
| } else { | ||
| return r.ip6tablesPath | ||
| } | ||
| } | ||
|
|
||
| func (r *autoRedirect) setupIPTables(family int) error { | ||
| tableNameOutput := r.tableName + "-output" | ||
| tableNameForward := r.tableName + "-forward" | ||
| tableNamePreRouteing := r.tableName + "-prerouting" | ||
| iptablesPath := r.iptablesPathForFamily(family) | ||
| redirectPort := r.redirectPort() | ||
| // OUTPUT | ||
| err := r.runShell(iptablesPath, "-t nat -N", tableNameOutput) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNameOutput, | ||
| "-p tcp -o", r.tunOptions.Name, | ||
| "-j REDIRECT --to-ports", redirectPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = r.runShell(iptablesPath, "-t nat -I OUTPUT -j", tableNameOutput) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if r.androidSu { | ||
| return nil | ||
| } | ||
| // FORWARD | ||
| err = r.runShell(iptablesPath, "-N", tableNameForward) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = r.runShell(iptablesPath, "-A", tableNameForward, | ||
| "-i", r.tunOptions.Name, "-j", "ACCEPT") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = r.runShell(iptablesPath, "-A", tableNameForward, | ||
| "-o", r.tunOptions.Name, "-j", "ACCEPT") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = r.runShell(iptablesPath, "-I FORWARD -j", tableNameForward) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| // PREROUTING | ||
| err = r.runShell(iptablesPath, "-t nat -N", tableNamePreRouteing) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| var ( | ||
| routeAddress []netip.Prefix | ||
| routeExcludeAddress []netip.Prefix | ||
| ) | ||
| if family == unix.AF_INET { | ||
| routeAddress = r.tunOptions.Inet4RouteAddress | ||
| routeExcludeAddress = r.tunOptions.Inet4RouteExcludeAddress | ||
| } else { | ||
| routeAddress = r.tunOptions.Inet6RouteAddress | ||
| routeExcludeAddress = r.tunOptions.Inet6RouteExcludeAddress | ||
| } | ||
| if len(routeAddress) > 0 && (len(r.tunOptions.IncludeInterface) > 0 || len(r.tunOptions.IncludeUID) > 0) { | ||
| return E.New("`*_route_address` is conflict with `include_interface` or `include_uid`") | ||
| } | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-i", r.tunOptions.Name, "-j RETURN") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, address := range routeExcludeAddress { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-d", address.String(), "-j RETURN") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| for _, name := range r.tunOptions.ExcludeInterface { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-i", name, "-j RETURN") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| for _, uid := range r.tunOptions.ExcludeUID { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-m owner --uid-owner", uid, "-j RETURN") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| var dnsServerAddress netip.Addr | ||
| if family == unix.AF_INET { | ||
| dnsServerAddress = r.tunOptions.Inet4Address[0].Addr().Next() | ||
| } else { | ||
| dnsServerAddress = r.tunOptions.Inet6Address[0].Addr().Next() | ||
| } | ||
| if len(routeAddress) > 0 { | ||
| for _, address := range routeAddress { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-d", address.String(), "-p udp --dport 53 -j DNAT --to", dnsServerAddress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } else if len(r.tunOptions.IncludeInterface) > 0 || len(r.tunOptions.IncludeUID) > 0 { | ||
| for _, name := range r.tunOptions.IncludeInterface { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-i", name, "-p udp --dport 53 -j DNAT --to", dnsServerAddress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| for _, uidRange := range r.tunOptions.IncludeUID { | ||
| for uid := uidRange.Start; uid <= uidRange.End; uid++ { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-m owner --uid-owner", uid, "-p udp --dport 53 -j DNAT --to", dnsServerAddress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| } else { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-p udp --dport 53 -j DNAT --to", dnsServerAddress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, "-m addrtype --dst-type LOCAL -j RETURN") | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if len(routeAddress) > 0 { | ||
| for _, address := range routeAddress { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-d", address.String(), "-p tcp -j REDIRECT --to-ports", redirectPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } else if len(r.tunOptions.IncludeInterface) > 0 || len(r.tunOptions.IncludeUID) > 0 { | ||
| for _, name := range r.tunOptions.IncludeInterface { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-i", name, "-p tcp -j REDIRECT --to-ports", redirectPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| for _, uidRange := range r.tunOptions.IncludeUID { | ||
| for uid := uidRange.Start; uid <= uidRange.End; uid++ { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-m owner --uid-owner", uid, "-p tcp -j REDIRECT --to-ports", redirectPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| } else { | ||
| err = r.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, | ||
| "-p tcp -j REDIRECT --to-ports", redirectPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| err = r.runShell(iptablesPath, "-t nat -I PREROUTING -j", tableNamePreRouteing) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (r *autoRedirect) cleanupIPTables(family int) { | ||
| tableNameOutput := r.tableName + "-output" | ||
| tableNameForward := r.tableName + "-forward" | ||
| tableNamePreRouteing := r.tableName + "-prerouting" | ||
| iptablesPath := r.iptablesPathForFamily(family) | ||
| _ = r.runShell(iptablesPath, "-t nat -D OUTPUT -j", tableNameOutput) | ||
| _ = r.runShell(iptablesPath, "-t nat -F", tableNameOutput) | ||
| _ = r.runShell(iptablesPath, "-t nat -X", tableNameOutput) | ||
| if !r.androidSu { | ||
| _ = r.runShell(iptablesPath, "-D FORWARD -j", tableNameForward) | ||
| _ = r.runShell(iptablesPath, "-F", tableNameForward) | ||
| _ = r.runShell(iptablesPath, "-X", tableNameForward) | ||
| _ = r.runShell(iptablesPath, "-t nat -D PREROUTING -j", tableNamePreRouteing) | ||
| _ = r.runShell(iptablesPath, "-t nat -F", tableNamePreRouteing) | ||
| _ = r.runShell(iptablesPath, "-t nat -X", tableNamePreRouteing) | ||
| } | ||
| } | ||
|
|
||
| func (r *autoRedirect) runShell(commands ...any) error { | ||
| commandStr := strings.Join(F.MapToString(commands), " ") | ||
| var command *exec.Cmd | ||
| if r.androidSu { | ||
| command = exec.Command(r.suPath, "-c", commandStr) | ||
| } else { | ||
| commandArray := strings.Split(commandStr, " ") | ||
| command = exec.Command(commandArray[0], commandArray[1:]...) | ||
| } | ||
| combinedOutput, err := command.CombinedOutput() | ||
| if err != nil { | ||
| return E.Extend(err, F.ToString(commandStr, ": ", string(combinedOutput))) | ||
| } | ||
| return nil | ||
| } |
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