arc: Move platform2/arc/network/ to platform2/patchpanel

Next step in the arc-networkd -> patchpanel rename, this patch moves the
location of the code.

BUG=b:151879931
TEST=units,flashed image to atlas
TEST=tasts arc.PlayStore, crostini.LaunchTerminal.download

Change-Id: I1b5cf8d670e1631d46f6449b725395157bf88dde
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2115863
Tested-by: Garrick Evans <garrick@chromium.org>
Commit-Queue: Garrick Evans <garrick@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Hugo Benichi <hugobenichi@google.com>
diff --git a/patchpanel/main.cc b/patchpanel/main.cc
new file mode 100644
index 0000000..91f1cd2
--- /dev/null
+++ b/patchpanel/main.cc
@@ -0,0 +1,76 @@
+// Copyright 2016 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <memory>
+#include <utility>
+
+#include <base/files/scoped_file.h>
+#include <base/logging.h>
+#include <brillo/flag_helper.h>
+#include <brillo/syslog_logging.h>
+
+#include "patchpanel/adb_proxy.h"
+#include "patchpanel/helper_process.h"
+#include "patchpanel/manager.h"
+#include "patchpanel/multicast_proxy.h"
+#include "patchpanel/ndproxy.h"
+#include "patchpanel/socket.h"
+
+int main(int argc, char* argv[]) {
+  DEFINE_bool(log_to_stderr, false, "Log to both syslog and stderr");
+  DEFINE_int32(
+      adb_proxy_fd, -1,
+      "Control socket for starting the ADB proxy subprocess. Used internally.");
+  DEFINE_int32(mcast_proxy_fd, -1,
+               "Control socket for starting the multicast proxy "
+               "subprocess. Used internally.");
+  DEFINE_int32(
+      nd_proxy_fd, -1,
+      "Control socket for starting the ND proxy subprocess. Used internally.");
+
+  brillo::FlagHelper::Init(argc, argv, "ARC network daemon");
+
+  int flags = brillo::kLogToSyslog | brillo::kLogHeader;
+  if (FLAGS_log_to_stderr)
+    flags |= brillo::kLogToStderr;
+  brillo::InitLog(flags);
+
+  if (FLAGS_adb_proxy_fd >= 0) {
+    LOG(INFO) << "Spawning adb proxy";
+    base::ScopedFD fd(FLAGS_adb_proxy_fd);
+    patchpanel::AdbProxy adb_proxy(std::move(fd));
+    return adb_proxy.Run();
+  }
+
+  if (FLAGS_nd_proxy_fd >= 0) {
+    LOG(INFO) << "Spawning nd proxy";
+    base::ScopedFD fd(FLAGS_nd_proxy_fd);
+    patchpanel::NDProxyDaemon nd_proxy(std::move(fd));
+    return nd_proxy.Run();
+  }
+
+  if (FLAGS_mcast_proxy_fd >= 0) {
+    LOG(INFO) << "Spawning multicast proxy";
+    base::ScopedFD fd(FLAGS_mcast_proxy_fd);
+    patchpanel::MulticastProxy mcast_proxy(std::move(fd));
+    return mcast_proxy.Run();
+  }
+
+  auto adb_proxy = std::make_unique<patchpanel::HelperProcess>();
+  adb_proxy->Start(argc, argv, "--adb_proxy_fd");
+
+  auto mcast_proxy = std::make_unique<patchpanel::HelperProcess>();
+  mcast_proxy->Start(argc, argv, "--mcast_proxy_fd");
+
+  auto nd_proxy = std::make_unique<patchpanel::HelperProcess>();
+  nd_proxy->Start(argc, argv, "--nd_proxy_fd");
+
+  LOG(INFO) << "Starting patchpanel manager";
+  patchpanel::Manager manager(std::move(adb_proxy), std::move(mcast_proxy),
+                                std::move(nd_proxy));
+  return manager.Run();
+}