diff options
author | Robin Tarsiger <rtarsiger@dasyatidae.com> | 2016-04-03 15:00:29 -0500 |
---|---|---|
committer | Robin Tarsiger <rtarsiger@dasyatidae.com> | 2016-04-03 15:14:06 -0500 |
commit | 6cb9b5a231d7f41e409daa012ee7d50a52c65daa (patch) | |
tree | 29086c7eb124b8da43d21dca46920329b18b3a6e /proxies/proxy_transparent | |
parent | 99f24043130d8b3c5cf098371e23c64abffef385 (diff) |
Split "proxies" into "proxy_dialers" and "modes"
Half of the packages in there registered dialer types with golang.org/x/net/proxy,
and half of them were proxying modes for the program as a whole. These are separate
things, so move them into separate directories.
Diffstat (limited to 'proxies/proxy_transparent')
-rw-r--r-- | proxies/proxy_transparent/proxy_transparent.go | 359 |
1 files changed, 0 insertions, 359 deletions
diff --git a/proxies/proxy_transparent/proxy_transparent.go b/proxies/proxy_transparent/proxy_transparent.go deleted file mode 100644 index 1f93a46..0000000 --- a/proxies/proxy_transparent/proxy_transparent.go +++ /dev/null @@ -1,359 +0,0 @@ -/* - * Copyright (c) 2014-2015, Yawning Angel <yawning at torproject dot org> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -// Go language Tor Pluggable Transport suite. Works only as a managed -// client/server. -package proxy_transparent - -import ( - "fmt" - "io" - golog "log" - "net" - "net/url" - "strconv" - "strings" - "sync" - - "golang.org/x/net/proxy" - - "git.torproject.org/pluggable-transports/goptlib.git" - "github.com/OperatorFoundation/obfs4/common/log" - "github.com/OperatorFoundation/obfs4/common/termmon" - "github.com/OperatorFoundation/obfs4/transports" - "github.com/OperatorFoundation/obfs4/transports/base" -) - -const ( - obfs4proxyVersion = "0.0.7-dev" - obfs4proxyLogFile = "obfs4proxy.log" - socksAddr = "127.0.0.1:1234" -) - -var stateDir string - -func ClientSetup(termMon *termmon.TermMonitor, target string) (launched bool, listeners []net.Listener) { - methodNames := [...]string{"obfs2"} - var ptClientProxy *url.URL = nil - - // Launch each of the client listeners. - for _, name := range methodNames { - t := transports.Get(name) - if t == nil { - log.Errorf("no such transport is supported: %s", name) - continue - } - - f, err := t.ClientFactory(stateDir) - if err != nil { - log.Errorf("failed to get ClientFactory: %s", name) - continue - } - - fmt.Println("Listening ", socksAddr) - ln, err := net.Listen("tcp", socksAddr) - if err != nil { - log.Errorf("failed to listen %s %s", name, err.Error()) - continue - } - - go clientAcceptLoop(target, termMon, f, ln, ptClientProxy) - - log.Infof("%s - registered listener: %s", name, ln.Addr()) - - listeners = append(listeners, ln) - launched = true - } - - return -} - -func clientAcceptLoop(target string, termMon *termmon.TermMonitor, f base.ClientFactory, ln net.Listener, proxyURI *url.URL) error { - defer ln.Close() - for { - conn, err := ln.Accept() - fmt.Println("Accepted") - if err != nil { - if e, ok := err.(net.Error); ok && !e.Temporary() { - return err - } - continue - } - go clientHandler(target, termMon, f, conn, proxyURI) - } -} - -func clientHandler(target string, termMon *termmon.TermMonitor, f base.ClientFactory, conn net.Conn, proxyURI *url.URL) { - defer conn.Close() - termMon.OnHandlerStart() - defer termMon.OnHandlerFinish() - - fmt.Println("handling...") - - name := f.Transport().Name() - - fmt.Println("Transport is", name) - - // Deal with arguments. - args, err := f.ParseArgs(&pt.Args{}) - if err != nil { - fmt.Println("Invalid arguments") - log.Errorf("%s(%s) - invalid arguments: %s", name, target, err) - return - } - - fmt.Println("Making dialer...") - - // Obtain the proxy dialer if any, and create the outgoing TCP connection. - dialFn := proxy.Direct.Dial - if proxyURI != nil { - dialer, err := proxy.FromURL(proxyURI, proxy.Direct) - if err != nil { - // This should basically never happen, since config protocol - // verifies this. - fmt.Println("failed to obtain dialer", proxyURI, proxy.Direct) - log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, target, log.ElideError(err)) - return - } - dialFn = dialer.Dial - } - - fmt.Println("Dialing...") - - remote, err := f.Dial("tcp", target, dialFn, args) - if err != nil { - fmt.Println("outgoing connection failed") - log.Errorf("%s(%s) - outgoing connection failed: %s", name, target, log.ElideError(err)) - return - } - defer remote.Close() - - fmt.Println("copying...") - - if err = copyLoop(conn, remote); err != nil { - log.Warnf("%s(%s) - closed connection: %s", name, target, log.ElideError(err)) - } else { - log.Infof("%s(%s) - closed connection", name, target) - } - - fmt.Println("done") - - return -} - -func ServerSetup(termMon *termmon.TermMonitor, bindaddrString string) (launched bool, listeners []net.Listener) { - ptServerInfo, err := pt.ServerSetup(transports.Transports()) - if err != nil { - golog.Fatal(err) - } - - fmt.Println("ServerSetup") - - bindaddrs, _ := getServerBindaddrs(bindaddrString) - - for _, bindaddr := range bindaddrs { - name := bindaddr.MethodName - fmt.Println("bindaddr", bindaddr) - t := transports.Get(name) - if t == nil { - fmt.Println(name, "no such transport is supported") - continue - } - - f, err := t.ServerFactory(stateDir, &bindaddr.Options) - if err != nil { - fmt.Println(name, err.Error()) - continue - } - - ln, err := net.ListenTCP("tcp", bindaddr.Addr) - if err != nil { - fmt.Println(name, err.Error()) - continue - } - - go serverAcceptLoop(termMon, f, ln, &ptServerInfo) - - log.Infof("%s - registered listener: %s", name, log.ElideAddr(ln.Addr().String())) - - listeners = append(listeners, ln) - launched = true - } - - return -} - -func getServerBindaddrs(serverBindaddr string) ([]pt.Bindaddr, error) { - var result []pt.Bindaddr - - for _, spec := range strings.Split(serverBindaddr, ",") { - var bindaddr pt.Bindaddr - - parts := strings.SplitN(spec, "-", 2) - if len(parts) != 2 { - fmt.Println("TOR_PT_SERVER_BINDADDR: doesn't contain \"-\"", spec) - return nil, nil - } - bindaddr.MethodName = parts[0] - addr, err := resolveAddr(parts[1]) - if err != nil { - fmt.Println("TOR_PT_SERVER_BINDADDR: ", spec, err.Error()) - return nil, nil - } - bindaddr.Addr = addr - // bindaddr.Options = optionsMap[bindaddr.MethodName] - result = append(result, bindaddr) - } - - return result, nil -} - -// Resolve an address string into a net.TCPAddr. We are a bit more strict than -// net.ResolveTCPAddr; we don't allow an empty host or port, and the host part -// must be a literal IP address. -func resolveAddr(addrStr string) (*net.TCPAddr, error) { - ipStr, portStr, err := net.SplitHostPort(addrStr) - if err != nil { - // Before the fixing of bug #7011, tor doesn't put brackets around IPv6 - // addresses. Split after the last colon, assuming it is a port - // separator, and try adding the brackets. - parts := strings.Split(addrStr, ":") - if len(parts) <= 2 { - return nil, err - } - addrStr := "[" + strings.Join(parts[:len(parts)-1], ":") + "]:" + parts[len(parts)-1] - ipStr, portStr, err = net.SplitHostPort(addrStr) - } - if err != nil { - return nil, err - } - if ipStr == "" { - return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a host part", addrStr)) - } - if portStr == "" { - return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a port part", addrStr)) - } - ip := net.ParseIP(ipStr) - if ip == nil { - return nil, net.InvalidAddrError(fmt.Sprintf("not an IP string: %q", ipStr)) - } - port, err := parsePort(portStr) - if err != nil { - return nil, err - } - return &net.TCPAddr{IP: ip, Port: port}, nil -} - -func parsePort(portStr string) (int, error) { - port, err := strconv.ParseUint(portStr, 10, 16) - return int(port), err -} - -func serverAcceptLoop(termMon *termmon.TermMonitor, f base.ServerFactory, ln net.Listener, info *pt.ServerInfo) error { - defer ln.Close() - for { - conn, err := ln.Accept() - fmt.Println("accepted") - if err != nil { - if e, ok := err.(net.Error); ok && !e.Temporary() { - return err - } - continue - } - go serverHandler(termMon, f, conn, info) - } -} - -func serverHandler(termMon *termmon.TermMonitor, f base.ServerFactory, conn net.Conn, info *pt.ServerInfo) { - defer conn.Close() - termMon.OnHandlerStart() - defer termMon.OnHandlerFinish() - - name := f.Transport().Name() - addrStr := log.ElideAddr(conn.RemoteAddr().String()) - fmt.Println("handling", name) - log.Infof("%s(%s) - new connection", name, addrStr) - - // Instantiate the server transport method and handshake. - remote, err := f.WrapConn(conn) - if err != nil { - fmt.Println("handshake failed") - log.Warnf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err)) - return - } - - // Connect to the orport. - orConn, err := pt.DialOr(info, conn.RemoteAddr().String(), name) - if err != nil { - fmt.Println("OR conn failed", info, conn.RemoteAddr(), name) - log.Errorf("%s(%s) - failed to connect to ORPort: %s", name, addrStr, log.ElideError(err)) - return - } - defer orConn.Close() - - if err = copyLoop(orConn, remote); err != nil { - log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err)) - } else { - log.Infof("%s(%s) - closed connection", name, addrStr) - } - - return -} - -func copyLoop(a net.Conn, b net.Conn) error { - // Note: b is always the pt connection. a is the SOCKS/ORPort connection. - errChan := make(chan error, 2) - - var wg sync.WaitGroup - wg.Add(2) - - go func() { - defer wg.Done() - defer b.Close() - defer a.Close() - _, err := io.Copy(b, a) - errChan <- err - }() - go func() { - defer wg.Done() - defer a.Close() - defer b.Close() - _, err := io.Copy(a, b) - errChan <- err - }() - - // Wait for both upstream and downstream to close. Since one side - // terminating closes the other, the second error in the channel will be - // something like EINVAL (though io.Copy() will swallow EOF), so only the - // first error is returned. - wg.Wait() - if len(errChan) > 0 { - return <-errChan - } - - return nil -} |