[tor-commits] [chutney/master] Restore bridges-obfs4 network

[nickm@xxxxxxxxxxxxxx]

commit d2c04fa91a0c44369ee5ffdc078fd30087c4ce21
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Tue Jun 23 15:59:11 2020 -0400

    Restore bridges-obfs4 network
    
    This network is not only useful, but it's an example of multi-phase
    initialization.
---
 networks/bridges-obfs4                  | 39 +++++++++++++++++++++++++++++++++
 torrc_templates/bridgeclient-obfs4.tmpl |  3 +++
 2 files changed, 42 insertions(+)

diff --git a/networks/bridges-obfs4 b/networks/bridges-obfs4
new file mode 100644
index 0000000..b1ca6c4
--- /dev/null
+++ b/networks/bridges-obfs4
@@ -0,0 +1,39 @@
+# By default, Authorities are not configured as exits
+Authority = Node(tag="a", authority=1, relay=1, torrc="authority.tmpl")
+ExitRelay = Node(tag="r", relay=1, exit=1, torrc="relay.tmpl")
+Client = Node(tag="c", client=1, torrc="client.tmpl")
+
+BridgeAuthority = Node(tag="ba", authority=1, bridgeauthority=1,
+                       relay=1, torrc="bridgeauthority.tmpl")
+Bridge = Node(tag="br", bridge=1, pt_bridge=1, relay=1, pt_transport="obfs4",
+       torrc="bridge-obfs4.tmpl")
+
+def obfs4_extra_args(env):
+    import os, re
+    # find the obfs4_bridgeline file.
+    location = os.path.join(env['dir'],
+                            "pt_state",
+                            "obfs4_bridgeline.txt")
+    if not os.path.exists(location):
+        return ""
+    # read the file and find the actual line
+    with open(location, 'r') as f:
+        for line in f:
+            if line.startswith("#"):
+                continue
+            if line.isspace():
+                continue
+            m = re.match(r'(.*<FINGERPRINT>) (cert.*)', line)
+            if m:
+                return m.group(2)
+    return ""
+
+Bridge.set_runtime("pt_extra", obfs4_extra_args)
+
+BridgeClient = Node(tag="bc", client=1, bridgeclient=1,
+	     torrc="bridgeclient-obfs4.tmpl", config_phase=2, launch_phase=2)
+
+NODES = Authority.getN(3) + BridgeAuthority.getN(1) + ExitRelay.getN(4) + \
+    Bridge.getN(1) + Client.getN(1) + BridgeClient.getN(1)
+
+ConfigureNodes(NODES)
diff --git a/torrc_templates/bridgeclient-obfs4.tmpl b/torrc_templates/bridgeclient-obfs4.tmpl
new file mode 100644
index 0000000..403d2f6
--- /dev/null
+++ b/torrc_templates/bridgeclient-obfs4.tmpl
@@ -0,0 +1,3 @@
+${include:bridgeclient.tmpl}
+
+ClientTransportPlugin obfs4 exec ${path:obfs4proxy}

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