DnsResolver.cpp

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#include "bsc/net/DnsResolver.hpp"
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
 
namespace bsc::net {
std::string DnsResolver::reverse_lookup(const std::string& ip) const {
    char host[NI_MAXHOST]{};
 
    sockaddr_in sa4{};
    sa4.sin_family = AF_INET;
    if (inet_pton(AF_INET, ip.c_str(), &sa4.sin_addr) == 1) {
        if (getnameinfo(reinterpret_cast<sockaddr*>(&sa4), sizeof(sa4), host, sizeof(host), nullptr, 0, NI_NAMEREQD) == 0) return host;
        return {};
    }
 
    sockaddr_in6 sa6{};
    sa6.sin6_family = AF_INET6;
    if (inet_pton(AF_INET6, ip.c_str(), &sa6.sin6_addr) == 1) {
        if (getnameinfo(reinterpret_cast<sockaddr*>(&sa6), sizeof(sa6), host, sizeof(host), nullptr, 0, NI_NAMEREQD) == 0) return host;
    }
    return {};
}
} // namespace bsc::net