nfs-utils: add IPv6 code to gssd

All of the pieces to handle IPv6 are now in place. Add IPv6-specific
code wrapped in the proper #ifdef's so that IPv6 support works when
it's enabled at build-time.

Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/gssd/gssd_proc.c b/utils/gssd/gssd_proc.c
index 1d55d8d1a58267080c4b160d4b2a763348b3f7c1..02239d29776ea769f161962870d5bebe8bb62b50 100644 (file)
--- a/utils/gssd/gssd_proc.c
+++ b/utils/gssd/gssd_proc.c
@@ -106,15 +106,32 @@ int pollsize;  /* the size of pollaray (in pollfd's) */
 /*
  * convert a presentation address string to a sockaddr_storage struct. Returns
  * true on success and false on failure.
+ *
+ * Note that we do not populate the sin6_scope_id field here for IPv6 addrs.
+ * gssd nececessarily relies on hostname resolution and DNS AAAA records
+ * do not generally contain scope-id's. This means that GSSAPI auth really
+ * can't work with IPv6 link-local addresses.
+ *
+ * We *could* consider changing this if we did something like adopt the
+ * Microsoft "standard" of using the ipv6-literal.net domainname, but it's
+ * not really feasible at present.
  */
 static int
 addrstr_to_sockaddr(struct sockaddr *sa, const char *addr, const int port)
 {
        struct sockaddr_in      *s4 = (struct sockaddr_in *) sa;
+#ifdef IPV6_SUPPORTED
+       struct sockaddr_in6     *s6 = (struct sockaddr_in6 *) sa;
+#endif /* IPV6_SUPPORTED */
 
        if (inet_pton(AF_INET, addr, &s4->sin_addr)) {
                s4->sin_family = AF_INET;
                s4->sin_port = htons(port);
+#ifdef IPV6_SUPPORTED
+       } else if (inet_pton(AF_INET6, addr, &s6->sin6_addr)) {
+               s6->sin6_family = AF_INET6;
+               s6->sin6_port = htons(port);
+#endif /* IPV6_SUPPORTED */
        } else {
                printerr(0, "ERROR: unable to convert %s to address\n", addr);
                return 0;
@@ -138,6 +155,11 @@ sockaddr_to_hostname(const struct sockaddr *sa, const char *addr)
        case AF_INET:
                addrlen = sizeof(struct sockaddr_in);
                break;
+#ifdef IPV6_SUPPORTED
+       case AF_INET6:
+               addrlen = sizeof(struct sockaddr_in6);
+               break;
+#endif /* IPV6_SUPPORTED */
        default:
                printerr(0, "ERROR: unrecognized addr family %d\n",
                         sa->sa_family);
@@ -556,6 +578,9 @@ populate_port(struct sockaddr *sa, const socklen_t salen,
              const unsigned short protocol)
 {
        struct sockaddr_in      *s4 = (struct sockaddr_in *) sa;
+#ifdef IPV6_SUPPORTED
+       struct sockaddr_in6     *s6 = (struct sockaddr_in6 *) sa;
+#endif /* IPV6_SUPPORTED */
        unsigned short          port;
 
        /*
@@ -570,6 +595,15 @@ populate_port(struct sockaddr *sa, const socklen_t salen,
                        return 1;
                }
                break;
+#ifdef IPV6_SUPPORTED
+       case AF_INET6:
+               if (s6->sin6_port != 0) {
+                       printerr(2, "DEBUG: port already set to %d\n",
+                                ntohs(s6->sin6_port));
+                       return 1;
+               }
+               break;
+#endif /* IPV6_SUPPORTED */
        default:
                printerr(0, "ERROR: unsupported address family %d\n",
                            sa->sa_family);
@@ -604,6 +638,11 @@ set_port:
        case AF_INET:
                s4->sin_port = htons(port);
                break;
+#ifdef IPV6_SUPPORTED
+       case AF_INET6:
+               s6->sin6_port = htons(port);
+               break;
+#endif /* IPV6_SUPPORTED */
        }
 
        return 1;
@@ -698,6 +737,11 @@ int create_auth_rpc_client(struct clnt_info *clp,
        case AF_INET:
                salen = sizeof(struct sockaddr_in);
                break;
+#ifdef IPV6_SUPPORTED
+       case AF_INET6:
+               salen = sizeof(struct sockaddr_in6);
+               break;
+#endif /* IPV6_SUPPORTED */
        default:
                printerr(1, "ERROR: Unknown address family %d\n",
                         addr->sa_family);