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[lldb][mcp] Fix unix domain socket protocol server addresses #146603

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Merged
merged 3 commits into from
Jul 3, 2025
Merged

[lldb][mcp] Fix unix domain socket protocol server addresses #146603

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8ffabe8
[lldb][mcp] Fix unix domain socket protocol server addresses
aperez Jul 1, 2025
42150df
Add test
aperez Jul 2, 2025
93a2730
Make sure we don't test with sockets over 104 chars
aperez Jul 2, 2025
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10 changes: 7 additions & 3 deletions lldb/source/Commands/CommandObjectProtocolServer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -75,9 +75,12 @@ class CommandObjectProtocolServerStart : public CommandObjectParsed {

ProtocolServer::Connection connection;
connection.protocol = protocol_and_mode->first;
connection.name =
formatv("[{0}]:{1}", uri->hostname.empty() ? "0.0.0.0" : uri->hostname,
uri->port.value_or(0));
if (connection.protocol == Socket::SocketProtocol::ProtocolUnixDomain)
connection.name = uri->path;
else
connection.name = formatv(
"[{0}]:{1}", uri->hostname.empty() ? "0.0.0.0" : uri->hostname,
uri->port.value_or(0));

if (llvm::Error error = server->Start(connection)) {
result.AppendErrorWithFormatv("{0}", llvm::fmt_consume(std::move(error)));
Expand All @@ -90,6 +93,7 @@ class CommandObjectProtocolServerStart : public CommandObjectParsed {
result.AppendMessageWithFormatv(
"{0} server started with connection listeners: {1}", protocol,
address);
result.SetStatus(eReturnStatusSuccessFinishNoResult);
}
}
};
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23 changes: 23 additions & 0 deletions lldb/test/API/commands/protocol/TestMCPUnixSocket.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
import os
import tempfile

from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *


class MCPUnixSocketCommandTestCase(TestBase):
@skipIfWindows
@no_debug_info_test
def test_unix_socket(self):
"""
Test if we can start an MCP protocol-server accepting unix sockets
"""

temp_directory = tempfile.TemporaryDirectory()
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@ashgti ashgti Jul 2, 2025

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One note, for unix sockets there is often a character limit of around 104~108 chars depending on the platform.

This will often fetch a directory using TEMP_DIR, which may be overridden by say a CI system to something pretty long.

We may either want to skip the test if the tempdir is to long or try to find a shorter directory like "/tmp", if it exists.

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@aperez aperez Jul 2, 2025

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Thanks! I've pushed a change to make sure we skip if the socket path is over that limit

socket_file = os.path.join(temp_directory.name, "mcp.sock")

self.expect(
f"protocol-server start MCP accept://{socket_file}",
startstr="MCP server started with connection listeners:",
substrs=[f"unix-connect://{socket_file}"],
)
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