I use the following small patch to enable OSXvnc to accept IPv6 and IPv4 connections. Index: main.c =================================================================== RCS file: /cvsroot/osxvnc/OSXvnc/OSXvnc-server/main.c,v retrieving revision 1.16 diff -u -r1.16 main.c --- main.c20 Jan 2005 16:42:45 -00001.16 +++ main.c1 Mar 2005 11:54:20 -0000 @@ -460,21 +460,21 @@ static void *listenerRun(void *ignore) { int listen_fd, client_fd; - struct sockaddr_in sin, peer; + struct sockaddr_in6 sin, peer; pthread_t client_thread; rfbClientPtr cl; int len, value; bzero(&sin, sizeof(sin)); - sin.sin_len = sizeof(sin); - sin.sin_family = AF_INET; + sin.sin6_len = sizeof(sin); + sin.sin6_family = AF_INET6; if (rfbLocalhostOnly) - sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + sin.sin6_addr = in6addr_loopback; else - sin.sin_addr.s_addr = htonl(INADDR_ANY); - sin.sin_port = htons(rfbPort); + sin.sin6_addr = in6addr_any; + sin.sin6_port = htons(rfbPort); - if ((listen_fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) { + if ((listen_fd = socket(PF_INET6, SOCK_STREAM, 0)) < 0) { return NULL; } value = 1; Index: rfbserver.c =================================================================== RCS file: /cvsroot/osxvnc/OSXvnc/OSXvnc-server/rfbserver.c,v retrieving revision 1.12 diff -u -r1.12 rfbserver.c --- rfbserver.c1 Feb 2005 18:01:00 -00001.12 +++ rfbserver.c1 Mar 2005 11:54:21 -0000 @@ -107,27 +107,26 @@ */ rfbClientPtr rfbReverseConnection(char *host, int port) { int sock; - struct sockaddr_in sin; + struct sockaddr_in6 sin; + struct addrinfo *res, hint; + int errCode; rfbClientPtr cl; bzero(&sin, sizeof(sin)); - sin.sin_len = sizeof(sin); - sin.sin_family = AF_INET; - sin.sin_addr.s_addr = inet_addr(host); - sin.sin_port = htons(port); - if ((int)sin.sin_addr.s_addr == -1) { - struct hostent *hostinfo; - hostinfo = gethostbyname(host); - if (hostinfo && hostinfo->h_addr) { - sin.sin_addr.s_addr = ((struct in_addr *)hostinfo->h_addr)->s_addr; - } - else { - rfbLog("Error resolving reverse host %s\n", host); + sin.sin6_len = sizeof(sin); + sin.sin6_family = AF_INET6; + sin.sin6_port = htons(port); + memset(&hint, 0, sizeof(hint)); + hint.ai_family = PF_INET6; + hint.ai_socktype = SOCK_STREAM; + if ((errCode = getaddrinfo(host, NULL, &hint, &res)) != 0) { + rfbLog("Error resolving reverse host %s: %s\n", host, gai_strerror(errCode)); return NULL; - } } + sin.sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; + freeaddrinfo(res); - if ((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) { + if ((sock = socket(PF_INET6, SOCK_STREAM, 0)) < 0) { rfbLog("Error creating reverse socket\n"); return NULL; } @@ -155,8 +154,9 @@ rfbProtocolVersionMsg pv; rfbClientPtr cl; BoxRec box; - struct sockaddr_in addr; - int i, addrlen = sizeof(struct sockaddr_in); + struct sockaddr_in6 addr; + int i, addrlen = sizeof(struct sockaddr_in6); + char host[NI_MAXHOST]; /* { @@ -175,7 +175,9 @@ cl->sock = sock; getpeername(sock, (struct sockaddr *)&addr, &addrlen); - cl->host = strdup(inet_ntoa(addr.sin_addr)); + host[0] = 0; + getnameinfo((struct sockaddr *)&addr, addrlen, host, sizeof(host), NULL, 0, 0); + cl->host = strdup(host); pthread_mutex_init(&cl->outputMutex, NULL);