GetIp4 improvements for domain improvements

src/utils/io.cpp

@@ -23,6 +23,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <netdb.h>
 
 #include <utils/constants.hpp>
 #include <utils/libc_error.hpp>
@@ -218,4 +219,38 @@ std::string GetIp4OfInterface(const std::string &ifName)
     return std::string{str};
 }
 
+std::string GetHostByName(const std::string &name)
+{
+    struct addrinfo hints = {};
+
+    hints.ai_family = PF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags |= AI_CANONNAME;
+
+    auto* res = gethostbyname(name.c_str());
+    if (res == nullptr)
+        return "";
+    if (res->h_addr_list == nullptr)
+        return "";
+
+    if (res->h_addrtype == AF_INET)
+    {
+        char str[INET_ADDRSTRLEN] = {0};
+        if (inet_ntop(AF_INET, res->h_addr_list[0], str, INET_ADDRSTRLEN) == nullptr)
+            return "";
+        return std::string{str};
+    }
+    else if (res->h_addrtype == AF_INET)
+    {
+        char str[INET6_ADDRSTRLEN] = {0};
+        if (inet_ntop(AF_INET6, res->h_addr_list[0], str, INET6_ADDRSTRLEN) == nullptr)
+            return "";
+        return std::string{str};
+    }
+    else
+    {
+        return "";
+    }
+}
+
 } // namespace io

src/utils/io.hpp

@@ -42,4 +42,6 @@ void AppendPath(std::string &source, const std::string &target);
 
 std::string GetIp4OfInterface(const std::string &ifName);
 
+std::string GetHostByName(const std::string& name);
+
 } // namespace io

src/utils/yaml_utils.cpp

@@ -156,7 +156,10 @@ std::string GetIp4(const YAML::Node &node, const std::string &name)
     if (ipFromIf.empty())
         FieldError(name, "must be a valid IPv4 address or a valid network interface with a IPv4 address");
 
-    return ipFromIf;
+    auto n = io::GetHostByName(name);
+    if (utils::GetIpVersion(n) == 4)
+        return n;
+    return "";
 }
 
 void AssertHasBool(const YAML::Node &node, const std::string &name)