Update anetTcpAccept to handle AF_INET6 addresses.

Change the sockaddr_in to sockaddr_storage which is capable of storing
both AF_INET and AF_INET6 sockets. Uses the sockaddr_storage ss_family
to correctly return the printable IP address and port.

src/anet.c

@@ -435,13 +435,20 @@ static int anetGenericAccept(char *err, int s, struct sockaddr *sa, socklen_t *l
 
 int anetTcpAccept(char *err, int s, char *ip, size_t ip_len, int *port) {
  int fd;
- struct sockaddr_in sa;
+ struct sockaddr_storage sa;
  socklen_t salen = sizeof(sa);
  if ((fd = anetGenericAccept(err,s,(struct sockaddr*)&sa,&salen)) == ANET_ERR)
  return ANET_ERR;
 
- if (ip) inet_ntop(sa.sin_family,(void*)&(sa.sin_addr),ip,ip_len);
- if (port) *port = ntohs(sa.sin_port);
+ if (sa.ss_family == AF_INET) {
+ struct sockaddr_in *s = (struct sockaddr_in *)&sa;
+ if (ip) inet_ntop(AF_INET,(void*)&(s->sin_addr),ip,ip_len);
+ if (port) *port = ntohs(s->sin_port);
+ } else {
+ struct sockaddr_in6 *s = (struct sockaddr_in6 *)&sa;
+ if (ip) inet_ntop(AF_INET6,(void*)&(s->sin6_addr),ip,ip_len);
+ if (port) *port = ntohs(s->sin6_port);
+ }
  return fd;
 }