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76 lines
2.8 KiB
C++
76 lines
2.8 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 dns", 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.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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