[PATCH 3/3] add -r flag to make mountd do reverse resolve of ipaddress on the fly

[Jeff Layton <jlayton@redhat.com>]

For those that want "traditional" showmount -a behavior from their mountd
(hostname:/path instead of ipaddr:/path). This patch adds a '-r' flag that
does a reverse-resolve for each IP address listed in the rmtab when
a dump operation is called.

Probably not a good idea for those concerned about performance, but since it's
not the default option, I don't see it being an issue.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

--- nfs-utils-1.0.10/utils/mountd/mountd.c.revres
+++ nfs-utils-1.0.10/utils/mountd/mountd.c
@@ -37,6 +37,7 @@ static void		usage(const char *, int exi
  static exports		get_exportlist(void);
  static struct nfs_fh_len *get_rootfh(struct svc_req *, dirpath *, mountstat3 *, int v3);

+int reverse_resolve = 0;
  int new_cache = 0;

  /* PRC: a high-availability callout program can be specified with -H
@@ -557,7 +558,7 @@ main(int argc, char **argv)

  	/* Parse the command line options and arguments. */
  	opterr = 0;
-	while ((c = getopt_long(argc, argv, "o:n:Fd:f:p:P:hH:N:V:vs:t:", longopts, NULL)) != EOF)
+	while ((c = getopt_long(argc, argv, "o:n:Fd:f:p:P:hH:N:V:vrs:t:", longopts, NULL)) != EOF)
  		switch (c) {
  		case 'o':
  			descriptors = atoi(optarg);
@@ -597,6 +598,9 @@ main(int argc, char **argv)
  		case 'n':
  			_rpcfdtype = SOCK_DGRAM;
  			break;
+		case 'r':
+			reverse_resolve = 1;
+			break;
  		case 's':
  			if ((state_dir = xstrdup(optarg)) == NULL) {
  				fprintf(stderr, "%s: xstrdup(%s) failed!\n",
--- nfs-utils-1.0.10/utils/mountd/rmtab.c.revres
+++ nfs-utils-1.0.10/utils/mountd/rmtab.c
@@ -25,6 +25,8 @@

  #include <limits.h> /* PATH_MAX */

+extern int reverse_resolve;
+
  /* If new path is a link do not destroy it but place the
   * file where the link points.
   */
@@ -185,6 +187,8 @@ mountlist_list(void)
  	struct rmtabent		*rep;
  	struct stat		stb;
  	int			lockid;
+	struct in_addr		addr;
+	struct hostent		*he;

  	if ((lockid = xflock(_PATH_RMTAB, "r")) < 0)
  		return NULL;
@@ -204,7 +208,14 @@ mountlist_list(void)
  		setrmtabent("r");
  		while ((rep = getrmtabent(1, NULL)) != NULL) {
  			m = (mountlist) xmalloc(sizeof(*m));
-			m->ml_hostname = xstrdup(rep->r_client);
+
+			if (reverse_resolve &&
+			   inet_aton((const char *) rep->r_client, &addr) &&
+			   (he = gethostbyaddr(&addr, sizeof(addr), AF_INET)))
+				m->ml_hostname = xstrdup(he->h_name);
+			else
+				m->ml_hostname = xstrdup(rep->r_client);
+
  			m->ml_directory = xstrdup(rep->r_path);
  			m->ml_next = mlist;
  			mlist = m;

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