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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
56 lines
1.6 KiB
C++
56 lines
1.6 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 <LibCore/ArgsParser.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 <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int main(int argc, char** argv)
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{
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if (pledge("stdio unix", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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const char* 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(argc, argv);
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// If input looks like an IPv4 address, we should do a reverse lookup.
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struct sockaddr_in addr;
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(53);
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int rc = inet_pton(AF_INET, name_or_ip, &addr.sin_addr);
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if (rc == 1) {
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// Okay, let's do a reverse lookup.
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auto* hostent = gethostbyaddr(&addr.sin_addr, sizeof(in_addr), AF_INET);
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if (!hostent) {
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fprintf(stderr, "Reverse lookup failed for '%s'\n", name_or_ip);
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return 1;
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}
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printf("%s is %s\n", 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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fprintf(stderr, "Lookup failed for '%s'\n", 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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const char* ip_str = inet_ntop(AF_INET, hostent->h_addr_list[0], buffer, sizeof(buffer));
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printf("%s is %s\n", name_or_ip, ip_str);
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return 0;
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}
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