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NetworkServer: Add a new NetworkServer service

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This service is responsible for loading network configuration from a
/etc/Network.ini config file. It sets up static IP address + mask or
starts DHCPClient depending on configuration.
This commit is contained in:
Maciej 2022-05-07 15:01:26 +02:00 • committed by Linus Groh
parent e14d4482a1
commit ddd4547e13
5 changed files with 109 additions and 6 deletions
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87
Userland/Services/NetworkServer/main.cpp Normal file
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/*
* Copyright (c) 2022, Maciej <sppmacd@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonParser.h>
#include <LibCore/Command.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/EventLoop.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments)
{
TRY(Core::System::pledge("stdio recvfd sendfd rpath unix exec proc"));
TRY(Core::System::unveil("/proc/net", "r"));
TRY(Core::System::unveil("/bin/DHCPClient", "x"));
TRY(Core::System::unveil("/etc/Network.ini", "r"));
TRY(Core::System::unveil("/bin/ifconfig", "x"));
TRY(Core::System::unveil(nullptr, nullptr));
auto config_file = TRY(Core::ConfigFile::open_for_system("Network"));
// FIXME: Port this to Core::Stream when it gets read_all.
auto proc_net_adapters_file = TRY(Core::File::open("/proc/net/adapters", Core::OpenMode::ReadOnly));
auto data = proc_net_adapters_file->read_all();
JsonParser parser(data);
JsonValue proc_net_adapters_json = TRY(parser.parse());
auto groups = config_file->groups();
dbgln("Interfaces to configure: {}", groups);
struct InterfaceConfig {
bool enabled = false;
bool dhcp_enabled = false;
String ipv4_address = "0.0.0.0";
String ipv4_netmask = "0.0.0.0";
};
Vector<String> interfaces_with_dhcp_enabled;
proc_net_adapters_json.as_array().for_each([&](auto& value) {
auto& if_object = value.as_object();
auto ifname = if_object.get("name").to_string();
if (ifname == "loop")
return;
InterfaceConfig config;
if (!groups.contains_slow(ifname)) {
dbgln("Config for interface {} doesn't exist, not enabling it", ifname);
} else {
config.enabled = config_file->read_bool_entry(ifname, "Enabled", true);
config.dhcp_enabled = config_file->read_bool_entry(ifname, "DHCP", false);
if (!config.dhcp_enabled) {
config.ipv4_address = config_file->read_entry(ifname, "IPv4Address", "0.0.0.0");
config.ipv4_netmask = config_file->read_entry(ifname, "IPv4Netmask", "0.0.0.0");
}
}
if (config.enabled) {
if (config.dhcp_enabled)
interfaces_with_dhcp_enabled.append(ifname);
else {
// FIXME: Propagate errors
// FIXME: Do this asynchronously
dbgln("Setting up interface {} statically ({}/{})", ifname, config.ipv4_address, config.ipv4_netmask);
MUST(Core::command("ifconfig", { "-a", ifname.characters(), "-i", config.ipv4_address.characters(), "-m", config.ipv4_netmask.characters() }, {}));
}
}
});
if (!interfaces_with_dhcp_enabled.is_empty()) {
dbgln("Running DHCPClient for interfaces: {}", interfaces_with_dhcp_enabled);
Vector<char*> args;
char dhcp_client_arg[] = "DHCPClient";
args.append(dhcp_client_arg);
for (auto& iface : interfaces_with_dhcp_enabled)
args.append(const_cast<char*>(iface.characters()));
args.append(nullptr);
auto dhcp_client_pid = TRY(Core::System::posix_spawnp("DHCPClient", nullptr, nullptr, args.data(), environ));
TRY(Core::System::disown(dhcp_client_pid));
}
return 0;
}