Created a file for the dns lookup function

bakanet/src/bakanet/dns_lookup.cpp

@@ -0,0 +1,41 @@
+#include "dns_lookup.h"
+
+namespace Bk::Net {
+	std::vector<std::string> dns_lookup(const std::string &host_name, IpVersion ipv)
+	{
+	    std::vector<std::string> output;
+	 
+	    struct addrinfo hints, *res, *p;
+	    int status, ai_family;
+	    char ip_address[INET6_ADDRSTRLEN];
+	 
+	    ai_family = (int)ipv;
+	    memset(&hints, 0, sizeof hints);
+	    hints.ai_family = ai_family; 
+	    hints.ai_socktype = SOCK_STREAM;
+	 
+	    if ((status = getaddrinfo(host_name.c_str(), NULL, &hints, &res)) != 0) {
+	        output.push_back("");
+	        return output;
+	    }
+	 
+	    for(p = res;p != NULL; p = p->ai_next) {
+	        void *addr;
+	        if (p->ai_family == AF_INET) { // IPv4
+	            struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
+	            addr = &(ipv4->sin_addr);
+	        } else { // IPv6
+	            struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
+	            addr = &(ipv6->sin6_addr);
+	        }
+	 
+	        // convert the IP to a string
+	        inet_ntop(p->ai_family, addr, ip_address, sizeof ip_address);
+	        output.push_back(ip_address);
+	    }
+	 
+	    freeaddrinfo(res); // free the linked list
+	 
+	    return output;
+	}
+}

bakanet/src/bakanet/dns_lookup.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <vector>
+#include <iostream>
+#include <cstring>
+#include <string>
+#include <netdb.h>
+#include <arpa/inet.h>
+
+#include "ip_version.h"
+
+namespace Bk::Net {
+	std::vector<std::string> dns_lookup(const std::string &host_name, IpVersion ipv);
+}