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8b370f988b
It's a bit cleaner to just rely on AK/IPv4Address' ability to determine the validity of the given input. If a valid IP address is not returned, then input will be processed as a hostname.
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/IPv4Address.h>
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#include <LibCore/ArgsParser.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 <netdb.h>
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#include <netinet/in.h>
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#include <string.h>
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ErrorOr<int> serenity_main(Main::Arguments args)
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{
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TRY(Core::System::pledge("stdio unix"));
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char const* name_or_ip = nullptr;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Convert between domain name and IPv4 address.");
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args_parser.add_positional_argument(name_or_ip, "Domain name or IPv4 address", "name");
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args_parser.parse(args);
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// If input looks like an IPv4 address, we should do a reverse lookup.
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auto ip_address = IPv4Address::from_string(name_or_ip);
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if (ip_address.has_value()) {
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// Okay, let's do a reverse lookup.
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auto addr = ip_address.value().to_in_addr_t();
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auto* hostent = gethostbyaddr(&addr, sizeof(in_addr), AF_INET);
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if (!hostent) {
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warnln("Reverse lookup failed for '{}'", name_or_ip);
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return 1;
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}
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outln("{} is {}", name_or_ip, hostent->h_name);
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return 0;
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}
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auto* hostent = gethostbyname(name_or_ip);
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if (!hostent) {
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warnln("Lookup failed for '{}'", name_or_ip);
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return 1;
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}
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char buffer[INET_ADDRSTRLEN];
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char const* ip_str = inet_ntop(AF_INET, hostent->h_addr_list[0], buffer, sizeof(buffer));
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outln("{} is {}", name_or_ip, ip_str);
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return 0;
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}
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