src: add UV_PIPE_NO_TRUNCATE for bind in pipe_wrap.cc

Author: theanarkh

doc/api/net.md

@@ -29,11 +29,11 @@ sockets on other operating systems.
 [`socket.connect()`][] take a `path` parameter to identify IPC endpoints.
 
 On Unix, the local domain is also known as the Unix domain. The path is a
-file system pathname. It gets truncated to an OS-dependent length of
-`sizeof(sockaddr_un.sun_path) - 1`. Typical values are 107 bytes on Linux and
-103 bytes on macOS. If a Node.js API abstraction creates the Unix domain socket,
-it will unlink the Unix domain socket as well. For example,
-[`net.createServer()`][] may create a Unix domain socket and
+file system pathname. It will throw an error when the length of pathname is
+greater than the length of `sizeof(sockaddr_un.sun_path)`. Typical values are
+107 bytes on Linux and 103 bytes on macOS. If a Node.js API abstraction creates
+the Unix domain socket, it will unlink the Unix domain socket as well. For
+example, [`net.createServer()`][] may create a Unix domain socket and
 [`server.close()`][] will unlink it. But if a user creates the Unix domain
 socket outside of these abstractions, the user will need to remove it. The same
 applies when a Node.js API creates a Unix domain socket but the program then

src/pipe_wrap.cc

@@ -162,7 +162,8 @@ void PipeWrap::Bind(const FunctionCallbackInfo<Value>& args) {
   PipeWrap* wrap;
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
   node::Utf8Value name(args.GetIsolate(), args[0]);
-  int err = uv_pipe_bind2(&wrap->handle_, *name, name.length(), 0);
+  int err =
+      uv_pipe_bind2(&wrap->handle_, *name, name.length(), UV_PIPE_NO_TRUNCATE);
   args.GetReturnValue().Set(err);
 }
 
@@ -225,8 +226,12 @@ void PipeWrap::Connect(const FunctionCallbackInfo<Value>& args) {
 
   ConnectWrap* req_wrap =
       new ConnectWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_PIPECONNECTWRAP);
-  int err = req_wrap->Dispatch(
-      uv_pipe_connect2, &wrap->handle_, *name, name.length(), 0, AfterConnect);
+  int err = req_wrap->Dispatch(uv_pipe_connect2,
+                               &wrap->handle_,
+                               *name,
+                               name.length(),
+                               UV_PIPE_NO_TRUNCATE,
+                               AfterConnect);
   if (err) {
     delete req_wrap;
   } else {

test/parallel/test-net-pipe-with-long-path.js

@@ -0,0 +1,29 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const net = require('net');
+const fs = require('fs');
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+// Test UV_PIPE_NO_TRUNCATE, see pipw_wrap.cc
+const pipePath = `${common.PIPE}-${'x'.repeat(300)}`;
+
+const server = net.createServer()
+  .listen(pipePath)
+  // It may work on some operating systems
+  .on('listening', () => {
+    // The socket file must exsit
+    assert.ok(fs.existsSync(pipePath));
+    const socket = net.connect(pipePath, common.mustCall(() => {
+      socket.destroy();
+      server.close();
+    }));
+  })
+  .on('error', (error) => {
+    assert.ok(error.code === 'EINVAL', error.message);
+    net.connect(pipePath)
+      .on('error', common.mustCall((error) => {
+        assert.ok(error.code === 'EINVAL', error.message);
+      }));
+  });