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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/vendor/camlistore.org/pkg/netutil/ident.go b/vendor/camlistore.org/pkg/netutil/ident.go new file mode 100644 index 000000000..3866f8c1e --- /dev/null +++ b/vendor/camlistore.org/pkg/netutil/ident.go @@ -0,0 +1,275 @@ +/* +Copyright 2011 Google Inc. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +// Package netutil identifies the system userid responsible for +// localhost TCP connections. +package netutil // import "camlistore.org/pkg/netutil" + +import ( + "bufio" + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "net" + "os" + "os/exec" + "os/user" + "regexp" + "runtime" + "strconv" + "strings" +) + +var ( + ErrNotFound = errors.New("netutil: connection not found") + ErrUnsupportedOS = errors.New("netutil: not implemented on this operating system") +) + +// ConnUserid returns the uid that owns the given localhost connection. +// The returned error is ErrNotFound if the connection wasn't found. +func ConnUserid(conn net.Conn) (uid int, err error) { + return AddrPairUserid(conn.LocalAddr(), conn.RemoteAddr()) +} + +// HostPortToIP parses a host:port to a TCPAddr without resolving names. +// If given a context IP, it will resolve localhost to match the context's IP family. +func HostPortToIP(hostport string, ctx *net.TCPAddr) (hostaddr *net.TCPAddr, err error) { + host, port, err := net.SplitHostPort(hostport) + if err != nil { + return nil, err + } + iport, err := strconv.Atoi(port) + if err != nil || iport < 0 || iport > 0xFFFF { + return nil, fmt.Errorf("invalid port %d", iport) + } + var addr net.IP + if ctx != nil && host == "localhost" { + if ctx.IP.To4() != nil { + addr = net.IPv4(127, 0, 0, 1) + } else { + addr = net.IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1} + } + } else if addr = net.ParseIP(host); addr == nil { + return nil, fmt.Errorf("could not parse IP %s", host) + } + + return &net.TCPAddr{IP: addr, Port: iport}, nil +} + +// AddrPairUserid returns the local userid who owns the TCP connection +// given by the local and remote ip:port (lipport and ripport, +// respectively). Returns ErrNotFound for the error if the TCP connection +// isn't found. +func AddrPairUserid(local, remote net.Addr) (uid int, err error) { + lAddr, lOk := local.(*net.TCPAddr) + rAddr, rOk := remote.(*net.TCPAddr) + if !(lOk && rOk) { + return -1, fmt.Errorf("netutil: Could not convert Addr to TCPAddr.") + } + + localv4 := (lAddr.IP.To4() != nil) + remotev4 := (rAddr.IP.To4() != nil) + if localv4 != remotev4 { + return -1, fmt.Errorf("netutil: address pairs of different families; localv4=%v, remotev4=%v", + localv4, remotev4) + } + + switch runtime.GOOS { + case "darwin": + return uidFromLsof(lAddr.IP, lAddr.Port, rAddr.IP, rAddr.Port) + case "freebsd": + return uidFromSockstat(lAddr.IP, lAddr.Port, rAddr.IP, rAddr.Port) + case "linux": + file := "/proc/net/tcp" + if !localv4 { + file = "/proc/net/tcp6" + } + f, err := os.Open(file) + if err != nil { + return -1, fmt.Errorf("Error opening %s: %v", file, err) + } + defer f.Close() + return uidFromProcReader(lAddr.IP, lAddr.Port, rAddr.IP, rAddr.Port, f) + } + return 0, ErrUnsupportedOS +} + +func toLinuxIPv4Order(b []byte) []byte { + binary.BigEndian.PutUint32(b, binary.LittleEndian.Uint32(b)) + return b +} + +func toLinuxIPv6Order(b []byte) []byte { + for i := 0; i < 16; i += 4 { + sb := b[i : i+4] + binary.BigEndian.PutUint32(sb, binary.LittleEndian.Uint32(sb)) + } + return b +} + +type maybeBrackets net.IP + +func (p maybeBrackets) String() string { + s := net.IP(p).String() + if strings.Contains(s, ":") { + return "[" + s + "]" + } + return s +} + +// Changed by tests. +var uidFromUsername = uidFromUsernameFn + +func uidFromUsernameFn(username string) (uid int, err error) { + if uid := os.Getuid(); uid != 0 && username == os.Getenv("USER") { + return uid, nil + } + u, err := user.Lookup(username) + if err == nil { + uid, err := strconv.Atoi(u.Uid) + return uid, err + } + return 0, err +} + +func uidFromLsof(lip net.IP, lport int, rip net.IP, rport int) (uid int, err error) { + seek := fmt.Sprintf("%s:%d->%s:%d", maybeBrackets(lip), lport, maybeBrackets(rip), rport) + seekb := []byte(seek) + if _, err = exec.LookPath("lsof"); err != nil { + return + } + cmd := exec.Command("lsof", + "-b", // avoid system calls that could block + "-w", // and don't warn about cases where -b fails + "-n", // don't resolve network names + "-P", // don't resolve network ports, + // TODO(bradfitz): pass down the uid we care about, then do: ? + //"-a", // AND the following together: + // "-u", strconv.Itoa(uid) // just this uid + "-itcp") // we only care about TCP connections + stdout, err := cmd.StdoutPipe() + if err != nil { + return + } + defer cmd.Wait() + defer stdout.Close() + err = cmd.Start() + if err != nil { + return + } + defer cmd.Process.Kill() + br := bufio.NewReader(stdout) + for { + line, err := br.ReadSlice('\n') + if err == io.EOF { + break + } + if err != nil { + return -1, err + } + if !bytes.Contains(line, seekb) { + continue + } + // SystemUIS 276 bradfitz 15u IPv4 0xffffff801a7c74e0 0t0 TCP 127.0.0.1:56718->127.0.0.1:5204 (ESTABLISHED) + f := bytes.Fields(line) + if len(f) < 8 { + continue + } + username := string(f[2]) + return uidFromUsername(username) + } + return -1, ErrNotFound + +} + +func uidFromSockstat(lip net.IP, lport int, rip net.IP, rport int) (int, error) { + cmd := exec.Command("sockstat", "-Ptcp") + stdout, err := cmd.StdoutPipe() + if err != nil { + return -1, err + } + defer cmd.Wait() + defer stdout.Close() + err = cmd.Start() + if err != nil { + return -1, err + } + defer cmd.Process.Kill() + + return uidFromSockstatReader(lip, lport, rip, rport, stdout) +} + +func uidFromSockstatReader(lip net.IP, lport int, rip net.IP, rport int, r io.Reader) (int, error) { + pat, err := regexp.Compile(fmt.Sprintf(`^([^ ]+).*%s:%d *%s:%d$`, + lip.String(), lport, rip.String(), rport)) + if err != nil { + return -1, err + } + scanner := bufio.NewScanner(r) + for scanner.Scan() { + l := scanner.Text() + m := pat.FindStringSubmatch(l) + if len(m) == 2 { + return uidFromUsername(m[1]) + } + } + + if err := scanner.Err(); err != nil { + return -1, err + } + + return -1, ErrNotFound +} + +func uidFromProcReader(lip net.IP, lport int, rip net.IP, rport int, r io.Reader) (uid int, err error) { + buf := bufio.NewReader(r) + + localHex := "" + remoteHex := "" + ipv4 := lip.To4() != nil + if ipv4 { + // In the kernel, the port is run through ntohs(), and + // the inet_request_socket in + // include/net/inet_socket.h says the "loc_addr" and + // "rmt_addr" fields are __be32, but get_openreq4's + // printf of them is raw, without byte order + // converstion. + localHex = fmt.Sprintf("%08X:%04X", toLinuxIPv4Order([]byte(lip.To4())), lport) + remoteHex = fmt.Sprintf("%08X:%04X", toLinuxIPv4Order([]byte(rip.To4())), rport) + } else { + localHex = fmt.Sprintf("%032X:%04X", toLinuxIPv6Order([]byte(lip.To16())), lport) + remoteHex = fmt.Sprintf("%032X:%04X", toLinuxIPv6Order([]byte(rip.To16())), rport) + } + + for { + line, err := buf.ReadString('\n') + if err != nil { + return -1, ErrNotFound + } + parts := strings.Fields(strings.TrimSpace(line)) + if len(parts) < 8 { + continue + } + // log.Printf("parts[1] = %q; localHex = %q", parts[1], localHex) + if parts[1] == localHex && parts[2] == remoteHex { + uid, err = strconv.Atoi(parts[7]) + return uid, err + } + } + panic("unreachable") +} diff --git a/vendor/camlistore.org/pkg/netutil/netutil.go b/vendor/camlistore.org/pkg/netutil/netutil.go new file mode 100644 index 000000000..0add9320d --- /dev/null +++ b/vendor/camlistore.org/pkg/netutil/netutil.go @@ -0,0 +1,141 @@ +/* +Copyright 2014 The Camlistore Authors + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package netutil + +import ( + "errors" + "fmt" + "net" + "net/url" + "strings" + "time" +) + +// AwaitReachable tries to make a TCP connection to addr regularly. +// It returns an error if it's unable to make a connection before maxWait. +func AwaitReachable(addr string, maxWait time.Duration) error { + done := time.Now().Add(maxWait) + for time.Now().Before(done) { + c, err := net.Dial("tcp", addr) + if err == nil { + c.Close() + return nil + } + time.Sleep(100 * time.Millisecond) + } + return fmt.Errorf("%v unreachable for %v", addr, maxWait) +} + +// HostPort takes a urlStr string URL, and returns a host:port string suitable +// to passing to net.Dial, with the port set as the scheme's default port if +// absent. +func HostPort(urlStr string) (string, error) { + // TODO: rename this function to URLHostPort instead, like + // ListenHostPort below. + u, err := url.Parse(urlStr) + if err != nil { + return "", fmt.Errorf("could not parse %q as a url: %v", urlStr, err) + } + if u.Scheme == "" { + return "", fmt.Errorf("url %q has no scheme", urlStr) + } + hostPort := u.Host + if hostPort == "" || strings.HasPrefix(hostPort, ":") { + return "", fmt.Errorf("url %q has no host", urlStr) + } + idx := strings.Index(hostPort, "]") + if idx == -1 { + idx = 0 + } + if !strings.Contains(hostPort[idx:], ":") { + if u.Scheme == "https" { + hostPort += ":443" + } else { + hostPort += ":80" + } + } + return hostPort, nil +} + +// ListenHostPort maps a listen address into a host:port string. +// If the host part in listenAddr is empty or 0.0.0.0, localhost +// is used instead. +func ListenHostPort(listenAddr string) (string, error) { + hp := listenAddr + if strings.HasPrefix(hp, ":") { + hp = "localhost" + hp + } else if strings.HasPrefix(hp, "0.0.0.0:") { + hp = "localhost:" + hp[len("0.0.0.0:"):] + } + if _, _, err := net.SplitHostPort(hp); err != nil { + return "", err + } + return hp, nil +} + +// ListenOnLocalRandomPort returns a TCP listener on a random +// localhost port. +func ListenOnLocalRandomPort() (net.Listener, error) { + ip, err := Localhost() + if err != nil { + return nil, err + } + return net.ListenTCP("tcp", &net.TCPAddr{IP: ip, Port: 0}) +} + +// Localhost returns the first address found when +// doing a lookup of "localhost". If not successful, +// it looks for an ip on the loopback interfaces. +func Localhost() (net.IP, error) { + if ip := localhostLookup(); ip != nil { + return ip, nil + } + if ip := loopbackIP(); ip != nil { + return ip, nil + } + return nil, errors.New("No loopback ip found.") +} + +// localhostLookup looks for a loopback IP by resolving localhost. +func localhostLookup() net.IP { + if ips, err := net.LookupIP("localhost"); err == nil && len(ips) > 0 { + return ips[0] + } + return nil +} + +// loopbackIP returns the first loopback IP address sniffing network +// interfaces or nil if none is found. +func loopbackIP() net.IP { + interfaces, err := net.Interfaces() + if err != nil { + return nil + } + for _, inf := range interfaces { + const flagUpLoopback = net.FlagUp | net.FlagLoopback + if inf.Flags&flagUpLoopback == flagUpLoopback { + addrs, _ := inf.Addrs() + for _, addr := range addrs { + ip, _, err := net.ParseCIDR(addr.String()) + if err == nil && ip.IsLoopback() { + return ip + } + } + } + } + return nil +} diff --git a/vendor/vendor.json b/vendor/vendor.json index 52f00b387..0c95500cd 100644 --- a/vendor/vendor.json +++ b/vendor/vendor.json @@ -18,6 +18,12 @@ "path": "appengine_internal/base", "revision": "" }, + { + "checksumSHA1": "ZjT4/uxN8N5WXikTtY1LdmMtL9Q=", + "path": "camlistore.org/pkg/netutil", + "revision": "c332b2881d09003e01491f2658ccf1dbbb006169", + "revisionTime": "2016-06-29T15:04:51Z" + }, { "path": "context", "revision": ""