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diff -up graphviz-2.34.0/cmd/lefty/os/unix/io.c.orig graphviz-2.34.0/cmd/lefty/os/unix/io.c
--- graphviz-2.34.0/cmd/lefty/os/unix/io.c.orig 2013-09-07 03:07:52.000000000 +0200
+++ graphviz-2.34.0/cmd/lefty/os/unix/io.c 2013-10-30 17:38:59.746296595 +0100
@@ -285,9 +285,8 @@ int IOwriteline (int ioi, char *bufp) {
static FILE *serverconnect (char *name) {
char *host, *portp, buf[1024];
- int port;
- struct hostent *hp;
- struct sockaddr_in sin;
+ struct addrinfo *ai;
+ struct addrinfo hints;
int cfd;
strcpy (buf, name);
@@ -295,17 +294,18 @@ static FILE *serverconnect (char *name)
portp = strchr (host, '/');
if (*host == 0 || !portp)
return NULL;
- *portp++ = 0, port = atoi (portp);
- if (!(hp = gethostbyname (host)))
- return NULL;
- memset ((char *) &sin, 1, sizeof (sin));
- memcpy ((char *) &sin.sin_addr, hp->h_addr, hp->h_length);
- sin.sin_family = hp->h_addrtype;
- sin.sin_port = htons (port);
- if ((cfd = socket (hp->h_addrtype, SOCK_STREAM, 0)) < 0)
- return NULL;
- if (connect (cfd, (struct sockaddr *) &sin, sizeof (sin)) < 0)
- return NULL;
+ *portp++ = 0;
+ memset (&hints, 0, sizeof (hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
+ hints.ai_socktype = SOCK_STREAM;
+ if (getaddrinfo (host, portp, &hints, &ai))
+ return freeaddrinfo(ai), NULL;
+ if ((cfd = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
+ return freeaddrinfo(ai), NULL;
+ if (connect (cfd, ai->ai_addr, ai->ai_addrlen) < 0)
+ return freeaddrinfo(ai), NULL;
+ freeaddrinfo(ai);
return fdopen (cfd, "w+");
}