[tor-commits] [stem/master] Empty bridge-ip-versions value broke parser

[atagar@xxxxxxxxxxxxxx]

commit ea4964267e519c33b039f88d9d857a8f6452b3a3
Author: Damian Johnson <atagar@xxxxxxxxxxxxxx>
Date:   Sun Jan 20 23:55:05 2013 -0800

    Empty bridge-ip-versions value broke parser
    
    A 'bridge-ip-versions' line without a value broke our parser...
    
      File "/home/karsten/tasks/task-7828/stem/stem/descriptor/extrainfo_descriptor.py", line 858, in __init__
        super(BridgeExtraInfoDescriptor, self).__init__(raw_contents, validate)
      File "/home/karsten/tasks/task-7828/stem/stem/descriptor/extrainfo_descriptor.py", line 413, in __init__
        self._parse(entries, validate)
      File "/home/karsten/tasks/task-7828/stem/stem/descriptor/extrainfo_descriptor.py", line 882, in _parse
        raise stem.ProtocolError("The bridge-ip-versions should be a comma separated listing of '<protocol>=<count>' mappings: '%s' (entry = '%s')" % (line, entry, ))
    ProtocolError: The bridge-ip-versions should be a comma separated listing of '<protocol>=<count>' mappings: 'bridge-ip-versions ' (entry = '')
    
    Reported by Karsten on...
    
    https://trac.torproject.org/7967
---
 stem/descriptor/extrainfo_descriptor.py      |   15 ++++++++-------
 test/unit/descriptor/extrainfo_descriptor.py |    3 +++
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/stem/descriptor/extrainfo_descriptor.py b/stem/descriptor/extrainfo_descriptor.py
index 75e974e..9d39f92 100644
--- a/stem/descriptor/extrainfo_descriptor.py
+++ b/stem/descriptor/extrainfo_descriptor.py
@@ -880,16 +880,17 @@ class BridgeExtraInfoDescriptor(ExtraInfoDescriptor):
       elif keyword == "bridge-ip-versions":
         self.ip_versions = {}
 
-        for entry in value.split(','):
-          if not '=' in entry:
-            raise stem.ProtocolError("The bridge-ip-versions should be a comma separated listing of '<protocol>=<count>' mappings: %s" % line)
+        if value:
+          for entry in value.split(','):
+            if not '=' in entry:
+              raise stem.ProtocolError("The bridge-ip-versions should be a comma separated listing of '<protocol>=<count>' mappings: %s" % line)
 
-          protocol, count = entry.split('=', 1)
+            protocol, count = entry.split('=', 1)
 
-          if not count.isdigit():
-            raise stem.ProtocolError("IP protocol count was non-numeric (%s): %s" % (count, line))
+            if not count.isdigit():
+              raise stem.ProtocolError("IP protocol count was non-numeric (%s): %s" % (count, line))
 
-          self.ip_versions[protocol] = int(count)
+            self.ip_versions[protocol] = int(count)
 
         del entries["bridge-ip-versions"]
 
diff --git a/test/unit/descriptor/extrainfo_descriptor.py b/test/unit/descriptor/extrainfo_descriptor.py
index 524dfab..e83a2b1 100644
--- a/test/unit/descriptor/extrainfo_descriptor.py
+++ b/test/unit/descriptor/extrainfo_descriptor.py
@@ -468,6 +468,9 @@ class TestExtraInfoDescriptor(unittest.TestCase):
     desc = get_bridge_extrainfo_descriptor({"bridge-ip-versions": "v4=16,v6=40"})
     self.assertEquals({'v4': 16, 'v6': 40}, desc.ip_versions)
 
+    desc = get_bridge_extrainfo_descriptor({"bridge-ip-versions": ""})
+    self.assertEquals({}, desc.ip_versions)
+
     desc_text = get_bridge_extrainfo_descriptor({"bridge-ip-versions": "v4=24.5"}, content = True)
     self.assertRaises(ValueError, RelayExtraInfoDescriptor, desc_text)
 

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