forked from Bananymous/banan-os
50 lines
1003 B
C++
50 lines
1003 B
C++
#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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#define MAX(a, b) ((a) < (b) ? (b) : (a))
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int main(int argc, char** argv)
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{
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if (argc != 2)
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{
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fprintf(stderr, "usage: %s DOMAIN\n", argv[0]);
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return 1;
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}
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const addrinfo hints {
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.ai_flags = 0,
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.ai_family = AF_INET,
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.ai_socktype = SOCK_STREAM,
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.ai_protocol = 0,
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.ai_addrlen = 0,
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.ai_addr = nullptr,
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.ai_canonname = nullptr,
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.ai_next = nullptr,
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};
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addrinfo* result;
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if (int ret = getaddrinfo(argv[1], nullptr, &hints, &result); ret != 0)
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{
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
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return 1;
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}
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for (addrinfo* ai = result; ai; ai = ai->ai_next)
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{
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if (ai->ai_family != AF_INET)
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continue;
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char buffer[NI_MAXHOST];
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if (inet_ntop(ai->ai_family, &reinterpret_cast<sockaddr_in*>(ai->ai_addr)->sin_addr, buffer, sizeof(buffer)) == nullptr)
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continue;
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printf("%s\n", buffer);
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return 0;
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}
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fprintf(stderr, "no address information available\n");
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return 0;
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}
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