libexport.a: Prepare to recognize IPv6 addresses in client_gettype()

The current open-coded parsing logic in client_gettype() will be hard
to modify to recognize IPv6 addresses.  Use a more generic mechanism
for detecting IP presentation addresses.

IPv6 will be enabled automatically in client_gettype() when host_pton()
is changed to support IPv6 addresses.

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

diff --git a/support/export/client.c b/support/export/client.c
index 21001ce282dd85ecbe038fa0d53b98ac5e55a043..3e797c94f3d024f417ad54aefc74076732268e06 100644 (file)
--- a/support/export/client.c
+++ b/support/export/client.c
@@ -602,7 +602,8 @@ client_check(const nfs_client *clp, const struct addrinfo *ai)
 int
 client_gettype(char *ident)
 {
-       char    *sp;
+       struct addrinfo *ai;
+       char *sp;
 
        if (ident[0] == '\0' || strcmp(ident, "*")==0)
                return MCL_ANONYMOUS;
@@ -622,12 +623,16 @@ client_gettype(char *ident)
                if (*sp == '\\' && sp[1])
                        sp++;
        }
-       /* check for N.N.N.N */
-       sp = ident;
-       if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
-       sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
-       sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
-       sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '\0') return MCL_FQDN;
-       /* we lie here a bit. but technically N.N.N.N == N.N.N.N/32 :) */
-       return MCL_SUBNETWORK;
+
+       /*
+        * Treat unadorned IP addresses as MCL_SUBNETWORK.
+        * Everything else is MCL_FQDN.
+        */
+       ai = host_pton(ident);
+       if (ai != NULL) {
+               freeaddrinfo(ai);
+               return MCL_SUBNETWORK;
+       }
+
+       return MCL_FQDN;
 }