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https://github.com/RGBCube/serenity
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2cd07c6212
This was just an alias for "unix" that I added early on back when there was some belief that we might be compatible with OpenBSD. We're clearly never going to be compatible with their pledges so just drop the alias.
76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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[32];
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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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