Copyright (C) 2010 Rémi Denis-Courmont.
Licensed under GNU General Public License version 2 or higher.
diff -ru live.orig//groupsock/GroupsockHelper.cpp live//groupsock/GroupsockHelper.cpp
--- live.orig//groupsock/GroupsockHelper.cpp	2010-04-09 22:27:39.000000000 +0300
+++ live//groupsock/GroupsockHelper.cpp	2010-04-17 20:18:11.000000000 +0300
@@ -625,25 +625,29 @@
 #include <hostLib.h>
       if (ERROR == (ourAddress = hostGetByName( hostname ))) break;
 #else
-      struct hostent* hstent
-	= (struct hostent*)gethostbyname(hostname);
-      if (hstent == NULL || hstent->h_length != 4) {
-	env.setResultErrMsg("initial gethostbyname() failed");
+      struct addrinfo hints, *res;
+      memset(&hints, 0, sizeof(hints));
+      hints.ai_family = AF_INET;
+      hints.ai_socktype = SOCK_DGRAM;
+      hints.ai_protocol = IPPROTO_UDP;
+      if (getaddrinfo(hostname, NULL, &hints, &res)) {
+	env.setResultErrMsg("initial getaddrinfo() failed");
 	break;
       }
       // Take the first address that's not bad
       // (This code, like many others, won't handle IPv6)
       netAddressBits addr = 0;
-      for (unsigned i = 0; ; ++i) {
-	char* addrPtr = hstent->h_addr_list[i];
-	if (addrPtr == NULL) break;
+      for (const struct addrinfo *p = res; p; p = p->ai_next) {
+        const struct in_addr in =
+          ((const struct sockaddr_in *)p->ai_addr)->sin_addr;
 
-	netAddressBits a = *(netAddressBits*)addrPtr;
+	netAddressBits a = in.s_addr;
 	if (!badAddress(a)) {
 	  addr = a;
 	  break;
 	}
       }
+      freeaddrinfo(res);
       if (addr != 0) {
 	fromAddr.sin_addr.s_addr = addr;
       } else {
diff -ru live.orig//groupsock/inet.c live//groupsock/inet.c
--- live.orig//groupsock/inet.c	2010-04-09 22:27:39.000000000 +0300
+++ live//groupsock/inet.c	2010-04-17 20:14:07.000000000 +0300
@@ -83,16 +83,6 @@
 #define NULL 0
 #endif
 
-#if !defined(VXWORKS)
-struct hostent* our_gethostbyname(name)
-     char* name;
-{
-	if (!initializeWinsockIfNecessary()) return NULL;
-
-	return (struct hostent*) gethostbyname(name);
-}
-#endif
-
 #ifndef USE_OUR_RANDOM
 /* Use the system-supplied "random()" and "srandom()" functions */
 #include <stdlib.h>
diff -ru live.orig//groupsock/NetAddress.cpp live//groupsock/NetAddress.cpp
--- live.orig//groupsock/NetAddress.cpp	2010-04-09 22:27:39.000000000 +0300
+++ live//groupsock/NetAddress.cpp	2010-04-17 20:13:29.000000000 +0300
@@ -83,15 +83,12 @@
 
 NetAddressList::NetAddressList(char const* hostname)
   : fNumAddresses(0), fAddressArray(NULL) {
-    struct hostent* host;
+
+    struct addrinfo *res;
 
     // Check first whether "hostname" is an IP address string:
     netAddressBits addr = our_inet_addr((char*)hostname);
     if (addr != INADDR_NONE) { // yes it was an IP address string
-      //##### host = gethostbyaddr((char*)&addr, sizeof (netAddressBits), AF_INET);
-      host = NULL; // don't bother calling gethostbyaddr(); we only want 1 addr
-
-      if (host == NULL) {
 	// For some unknown reason, gethostbyaddr() failed, so just
 	// return a 1-element list with the address we were given:
 	fNumAddresses = 1;
@@ -101,41 +98,40 @@
 	fAddressArray[0] = new NetAddress((u_int8_t*)&addr,
 					  sizeof (netAddressBits));
 	return;
-      }
     } else { // Try resolving "hostname" as a real host name
 
-#if defined(VXWORKS)
-      char hostentBuf[512];
-      host = (struct hostent*)resolvGetHostByName((char*)hostname,(char*)&hostentBuf,sizeof hostentBuf);
-#else
-      host = our_gethostbyname((char*)hostname);
-#endif
+      struct addrinfo hints;
+      memset(&hints, 0, sizeof(hints));
+      hints.ai_family = AF_INET;
+      hints.ai_socktype = SOCK_DGRAM; /* be sure to not get dups! */
+      hints.ai_protocol = IPPROTO_UDP;
 
-      if (host == NULL) {
+      if (getaddrinfo(hostname, NULL, &hints, &res))
 	// It was a host name, and we couldn't resolve it.  We're SOL.
 	return;
-      }
     }
 
-    u_int8_t const** const hAddrPtr
-      = (u_int8_t const**)host->h_addr_list;
-    if (hAddrPtr != NULL) {
-      // First, count the number of addresses:
-      u_int8_t const** hAddrPtr1 = hAddrPtr;
-      while (*hAddrPtr1 != NULL) {
-	++fNumAddresses;
-	++hAddrPtr1;
-      }
-
-      // Next, set up the list:
-      fAddressArray = new NetAddress*[fNumAddresses];
-      if (fAddressArray == NULL) return;
-
-      for (unsigned i = 0; i < fNumAddresses; ++i) {
-	fAddressArray[i]
-	  = new NetAddress(hAddrPtr[i], host->h_length);
-      }
+    // First, count the number of addresses:
+    for (const struct addrinfo *p = res; p; p = p->ai_next)
+      fNumAddresses++;
+
+    // Next, set up the list:
+    fAddressArray = new NetAddress*[fNumAddresses];
+
+    unsigned i = 0;
+    for (const struct addrinfo *p = res; p; p = p->ai_next) {
+      union
+      {
+	struct in_addr ip4;
+	uint8_t b[4];
+      } buf;
+      const struct sockaddr_in *sin =
+        (const struct sockaddr_in *)p->ai_addr;
+
+      buf.ip4 = sin->sin_addr;
+      fAddressArray[i++] = new NetAddress(buf.b, 4);
     }
+    freeaddrinfo(res);
 }
 
 NetAddressList::NetAddressList(NetAddressList const& orig) {