Services: Move to Userland/Services/

Userland/Services/DHCPClient/main.cpp

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2020, The SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "DHCPv4Client.h"
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+#include <LibCore/EventLoop.h>
+#include <LibCore/File.h>
+#include <LibCore/LocalServer.h>
+#include <stdio.h>
+#include <string.h>
+
+static u8 mac_part(const Vector<String>& parts, size_t index)
+{
+    auto chars = parts.at(index).characters();
+    return (chars[0] - '0') * 16 + (chars[1] - '0');
+}
+
+static MACAddress mac_from_string(const String& str)
+{
+    auto chunks = str.split(':');
+    ASSERT(chunks.size() == 6); // should we...worry about this?
+    return {
+        mac_part(chunks, 0), mac_part(chunks, 1), mac_part(chunks, 2),
+        mac_part(chunks, 3), mac_part(chunks, 4), mac_part(chunks, 5)
+    };
+}
+
+int main([[maybe_unused]] int argc, [[maybe_unused]] char** argv)
+{
+    if (pledge("stdio unix inet cpath rpath fattr", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    Core::EventLoop event_loop;
+
+    if (unveil("/proc/net/", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    unveil(nullptr, nullptr);
+
+    auto file = Core::File::construct("/proc/net/adapters");
+    if (!file->open(Core::IODevice::ReadOnly)) {
+        fprintf(stderr, "Error: %s\n", file->error_string());
+        return 1;
+    }
+
+    auto file_contents = file->read_all();
+    auto json = JsonValue::from_string(file_contents);
+    ASSERT(json.has_value());
+    Vector<InterfaceDescriptor> ifnames;
+    json.value().as_array().for_each([&ifnames](auto& value) {
+        auto if_object = value.as_object();
+
+        if (if_object.get("class_name").to_string() == "LoopbackAdapter")
+            return;
+
+        auto name = if_object.get("name").to_string();
+        auto mac = if_object.get("mac_address").to_string();
+        ifnames.append({ name, mac_from_string(mac) });
+    });
+
+    auto client = DHCPv4Client::construct(move(ifnames));
+
+    if (pledge("stdio inet", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    return event_loop.exec();
+}