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#include "resolver.hpp"
#include <stdexcept>
#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
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IpAddr Resolver::resolveHostnameAF(const std::string &hostname, int af)
{
IpAddr ipa;
addrinfo *results;
// This addrinfo is used as hint to filter the resolve
addrinfo hints;
memset(&hints, 0, sizeof(hints));
// Filter by the address family (ipv4, ipv6 or both)
hints.ai_family = af;
// Sock Stream is only used to not get duplicates
hints.ai_socktype = SOCK_STREAM;
// Resolve the hostname into a linkedlist that is allocated into results
if (getaddrinfo(hostname.c_str(), nullptr, &hints, &results) != 0)
{
throw std::runtime_error("Hostname could not be resolved");
}
// If no result liked list was allocated, something went wrong
if (results == nullptr)
{
throw std::runtime_error("Hostname could not be resolved");
}
// Iterate through the linked list
for (addrinfo *curr = results; curr != nullptr; curr = curr->ai_next)
{
// The current result is Ipv4
if (curr->ai_family == AF_INET)
{
sockaddr_in * sa4 = (sockaddr_in*)curr->ai_addr;
char str_addr[INET_ADDRSTRLEN];
// Convert the raw in4_addr to string
inet_ntop(AF_INET, &sa4->sin_addr, str_addr, INET_ADDRSTRLEN);
ipa = IpAddr::V4(str_addr);
break;
}
// The current result is Ipv6
else if (curr->ai_family == AF_INET6)
{
sockaddr_in6 * sa6 = (sockaddr_in6*)curr->ai_addr;
char str_addr[INET6_ADDRSTRLEN];
// Convert the raw in6_addr to string
inet_ntop(AF_INET6, &sa6->sin6_addr, str_addr, INET6_ADDRSTRLEN);
ipa = IpAddr::V6(str_addr);
break;
}
}
// Free the allocated linked list
freeaddrinfo(results);
return ipa;
}
std::vector<IpAddr> Resolver::resolveHostnameAllAF(const std::string &hostname, int af)
{
// See resolveHostnameAF for comments
std::vector<IpAddr> ips;
addrinfo *results;
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(hostname.c_str(), nullptr, &hints, &results) != 0)
{
throw std::runtime_error("Hostname could not be resolved");
}
if (results == nullptr)
{
throw std::runtime_error("Hostname could not be resolved");
}
for (addrinfo *curr = results; curr != nullptr; curr = curr->ai_next)
{
if (curr->ai_family == AF_INET)
{
sockaddr_in * sa4 = (sockaddr_in*)curr->ai_addr;
char str_addr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &sa4->sin_addr, str_addr, INET_ADDRSTRLEN);
ips.push_back(IpAddr::V4(str_addr));
}
else if (curr->ai_family == AF_INET6)
{
sockaddr_in6 * sa6 = (sockaddr_in6*)curr->ai_addr;
char str_addr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &sa6->sin6_addr, str_addr, INET6_ADDRSTRLEN);
ips.push_back(IpAddr::V6(str_addr));
}
}
freeaddrinfo(results);
return ips;
}
IpAddr Resolver::resolveHostnameIpv4(const std::string &hostname)
{
return resolveHostnameAF(hostname, AF_INET);
}
IpAddr Resolver::resolveHostnameIpv6(const std::string &hostname)
{
return resolveHostnameAF(hostname, AF_INET6);
}
std::vector<IpAddr> Resolver::resolveHostnameAllIpv4(const std::string &hostname)
{
return resolveHostnameAllAF(hostname, AF_INET);
}
std::vector<IpAddr> Resolver::resolveHostnameAllIpv6(const std::string &hostname)
{
return resolveHostnameAllAF(hostname, AF_INET6);
}
std::vector<IpAddr> Resolver::resolveHostnameAll(const std::string &hostname)
{
return resolveHostnameAllAF(hostname, AF_UNSPEC);
}