Олег Бородин
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
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extern "C" {
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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}
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#include <cstring>
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#include <expected>
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#include <string>
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#include <resolver.hpp>
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std::expected<Address, std::string> Resolver::Resolve(std::string hostname) {
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struct sockaddr_in sa;
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if (inet_pton(AF_INET, hostname.data(), &(sa.sin_addr)) == 1) {
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family = AF_INET;
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return Address(hostname, AF_INET);
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}
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if (inet_pton(AF_INET6, hostname.data(), &(sa.sin_addr)) == 1) {
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return Address(hostname, AF_INET6);
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}
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struct addrinfo hints, *res;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_DGRAM;
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int status = 0;
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if ((status = getaddrinfo(hostname.data(), NULL, &hints, &res)) != 0) {
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std::string error = gai_strerror(status);
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return std::unexpected("Resolve adress error: " + error);
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}
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struct addrinfo* p;
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char ipaddr[INET6_ADDRSTRLEN + 1];
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for (p = res; p != NULL; p = p->ai_next) {
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if (p->ai_family == AF_INET) {
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struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
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void* addr = &(ipv4->sin_addr);
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if (inet_ntop(p->ai_family, addr, ipaddr, sizeof(ipaddr)) == NULL) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Cannot conver address: " + error);
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}
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std::string address(ipaddr);
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return Address(address, AF_INET);;
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}
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}
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for (p = res; p != NULL; p = p->ai_next) {
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if (p->ai_family == AF_INET6) {
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struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
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void* addr = &(ipv6->sin6_addr);
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if (inet_ntop(p->ai_family, addr, ipaddr, sizeof(ipaddr)) == NULL) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Cannot conver address: " + error);
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}
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std::string address(ipaddr);
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return Address(address, AF_INET6);
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}
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}
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return std::unexpected("Cannot resolve hostname " + hostname);
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}
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