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Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
176 lines
5.7 KiB
C++
176 lines
5.7 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/IPv4Address.h>
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#include <AK/JsonObject.h>
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#include <AK/MACAddress.h>
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#include <AK/QuickSort.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <arpa/inet.h>
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#include <net/if_arp.h>
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#include <net/route.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath tty inet unix"));
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TRY(Core::System::unveil("/proc/net/arp", "r"));
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TRY(Core::System::unveil("/tmp/portal/lookup", "rw"));
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TRY(Core::System::unveil(nullptr, nullptr));
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static bool flag_set;
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static bool flag_delete;
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static bool flag_numeric;
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StringView value_ipv4_address;
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StringView value_hw_address;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Display or modify the system ARP cache");
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args_parser.add_option(flag_set, "Set an ARP table entry", "set", 's');
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args_parser.add_option(flag_delete, "Delete an ARP table entry", "delete", 'd');
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args_parser.add_option(flag_numeric, "Display numerical addresses. Don't resolve hostnames", "numeric", 'n');
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args_parser.add_positional_argument(value_ipv4_address, "IPv4 protocol address", "address", Core::ArgsParser::Required::No);
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args_parser.add_positional_argument(value_hw_address, "Hardware address", "hwaddress", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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enum class Alignment {
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Left,
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Right
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};
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struct Column {
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String title;
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Alignment alignment { Alignment::Left };
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int width { 0 };
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String buffer;
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};
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Vector<Column> columns;
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int proto_address_column = -1;
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int hw_address_column = -1;
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auto add_column = [&](auto title, auto alignment, auto width) {
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columns.append({ title, alignment, width, {} });
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return columns.size() - 1;
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};
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proto_address_column = add_column("Address", Alignment::Left, 15);
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hw_address_column = add_column("HWaddress", Alignment::Left, 15);
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auto print_column = [](auto& column, auto& string) {
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if (!column.width) {
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out("{}", string);
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return;
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}
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if (column.alignment == Alignment::Right) {
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out("{:>{1}} "sv, string, column.width);
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} else {
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out("{:<{1}} "sv, string, column.width);
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}
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};
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for (auto& column : columns)
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print_column(column, column.title);
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outln();
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if (!flag_set && !flag_delete) {
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auto file = Core::File::construct("/proc/net/arp");
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if (!file->open(Core::OpenMode::ReadOnly)) {
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warnln("Failed to open {}: {}", file->name(), file->error_string());
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return 1;
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}
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auto file_contents = file->read_all();
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auto json_or_error = JsonValue::from_string(file_contents);
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if (json_or_error.is_error()) {
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warnln("Failed to decode JSON: {}", json_or_error.error());
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return 1;
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}
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auto json = json_or_error.release_value();
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Vector<JsonValue> sorted_regions = json.as_array().values();
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quick_sort(sorted_regions, [](auto& a, auto& b) {
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return a.as_object().get("ip_address"sv).to_string() < b.as_object().get("ip_address"sv).to_string();
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});
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for (auto& value : sorted_regions) {
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auto& if_object = value.as_object();
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auto ip_address = if_object.get("ip_address"sv).to_string();
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if (!flag_numeric) {
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auto from_string = IPv4Address::from_string(ip_address);
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auto addr = from_string.value().to_in_addr_t();
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auto* hostent = gethostbyaddr(&addr, sizeof(in_addr), AF_INET);
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if (hostent != nullptr) {
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StringView host_name { hostent->h_name, strlen(hostent->h_name) };
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if (!host_name.is_empty())
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ip_address = host_name;
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}
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}
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auto mac_address = if_object.get("mac_address"sv).to_string();
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if (proto_address_column != -1)
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columns[proto_address_column].buffer = ip_address;
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if (hw_address_column != -1)
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columns[hw_address_column].buffer = mac_address;
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for (auto& column : columns)
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print_column(column, column.buffer);
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outln();
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};
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}
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if (flag_set || flag_delete) {
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if (value_ipv4_address.is_empty() || value_hw_address.is_empty()) {
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warnln("No protocol address or hardware address specified.");
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return 1;
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}
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auto address = IPv4Address::from_string(value_ipv4_address);
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if (!address.has_value()) {
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warnln("Invalid IPv4 protocol address: '{}'", value_ipv4_address);
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return 1;
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}
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auto hw_address = MACAddress::from_string(value_hw_address);
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if (!hw_address.has_value()) {
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warnln("Invalid MACAddress: '{}'", value_hw_address);
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return 1;
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}
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int fd = TRY(Core::System::socket(AF_INET, SOCK_DGRAM, IPPROTO_IP));
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struct arpreq arp_req;
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memset(&arp_req, 0, sizeof(arp_req));
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arp_req.arp_pa.sa_family = AF_INET;
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((sockaddr_in&)arp_req.arp_pa).sin_addr.s_addr = address.value().to_in_addr_t();
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*(MACAddress*)&arp_req.arp_ha.sa_data[0] = hw_address.value();
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if (flag_set)
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TRY(Core::System::ioctl(fd, SIOCSARP, &arp_req));
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if (flag_delete)
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TRY(Core::System::ioctl(fd, SIOCDARP, &arp_req));
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}
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return 0;
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}
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