mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 17:58:18 +03:00
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <netinet/in.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
if (pledge("stdio dns", nullptr) < 0) {
|
|
perror("pledge");
|
|
return 1;
|
|
}
|
|
|
|
const char* name_or_ip = nullptr;
|
|
Core::ArgsParser args_parser;
|
|
args_parser.add_positional_argument(name_or_ip, "Domain name or IPv4 address", "name");
|
|
args_parser.parse(argc, argv);
|
|
|
|
// If input looks like an IPv4 address, we should do a reverse lookup.
|
|
struct sockaddr_in addr;
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(53);
|
|
int rc = inet_pton(AF_INET, name_or_ip, &addr.sin_addr);
|
|
if (rc == 1) {
|
|
// Okay, let's do a reverse lookup.
|
|
auto* hostent = gethostbyaddr(&addr.sin_addr, sizeof(in_addr), AF_INET);
|
|
if (!hostent) {
|
|
fprintf(stderr, "Reverse lookup failed for '%s'\n", name_or_ip);
|
|
return 1;
|
|
}
|
|
printf("%s is %s\n", name_or_ip, hostent->h_name);
|
|
return 0;
|
|
}
|
|
|
|
auto* hostent = gethostbyname(name_or_ip);
|
|
if (!hostent) {
|
|
fprintf(stderr, "Lookup failed for '%s'\n", name_or_ip);
|
|
return 1;
|
|
}
|
|
|
|
char buffer[32];
|
|
const char* ip_str = inet_ntop(AF_INET, hostent->h_addr_list[0], buffer, sizeof(buffer));
|
|
|
|
printf("%s is %s\n", name_or_ip, ip_str);
|
|
return 0;
|
|
}
|