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Diffstat (limited to 'transports/transports.go')
-rw-r--r-- | transports/transports.go | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/transports/transports.go b/transports/transports.go new file mode 100644 index 0000000..6b80bdc --- /dev/null +++ b/transports/transports.go @@ -0,0 +1,91 @@ +/* + * Copyright (c) 2014, 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. + */ + +// Package transports provides a interface to query supported pluggable +// transports. +package transports + +import ( + "fmt" + "sync" + + "git.torproject.org/pluggable-transports/obfs4.git/transports/base" + "git.torproject.org/pluggable-transports/obfs4.git/transports/obfs2" + "git.torproject.org/pluggable-transports/obfs4.git/transports/obfs3" + "git.torproject.org/pluggable-transports/obfs4.git/transports/obfs4" +) + +var transportMapLock sync.Mutex +var transportMap map[string]base.Transport + +// Register registers a transport protocol. +func Register(transport base.Transport) error { + transportMapLock.Lock() + defer transportMapLock.Unlock() + + name := transport.Name() + _, registered := transportMap[name] + if registered { + return fmt.Errorf("transport '%s' already registered", name) + } + transportMap[name] = transport + + return nil +} + +// Transports returns the list of registered transport protocols. +func Transports() []string { + transportMapLock.Lock() + defer transportMapLock.Unlock() + + var ret []string + for name := range transportMap { + ret = append(ret, name) + } + + return ret +} + +// Get returns a transport protocol implementation by name. +func Get(name string) base.Transport { + transportMapLock.Lock() + defer transportMapLock.Unlock() + + t := transportMap[name] + + return t +} + +func init() { + // Initialize the transport list. + transportMap = make(map[string]base.Transport) + + // Register all the currently supported transports. + Register(new(obfs2.Transport)) + Register(new(obfs3.Transport)) + Register(new(obfs4.Transport)) +} |