gssd: configurable connection timeout for the rpcgssd service

When using rpc.gssd to secure NFSv3 FS using krb5,  the following errors
can happen as a result of network congestion.

"rpc.gssd WARNING: can't create tcp rpc_clnt to server ... : RPC: Remote
system error - Connection timed out"

we had a successful reproducer of the problem which we tested using this
patch by starting rpc.gssd with "-T 60" as the option which solved the
problem. reproducer steps were to throttle the network using tc command
and then in a never ending loop mount the share, then write some data in
the file on the share and unmount it. keep a delay of 5 sec between the
iteration of each loop.

CC: Christian Horn <chorn@redhat.com>
Signed-off-by: Rinku Kothiya <rkothiya@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/utils/gssd/gssd.c b/utils/gssd/gssd.c
index 611ef1a..6b8b863 100644
--- a/utils/gssd/gssd.c
+++ b/utils/gssd/gssd.c
@@ -64,6 +64,7 @@ char *ccachesearch[GSSD_MAX_CCACHE_SEARCH + 1];
 int  use_memcache = 0;
 int  root_uses_machine_creds = 1;
 unsigned int  context_timeout = 0;
+unsigned int  rpc_timeout = 5;
 char *preferred_realm = NULL;
 int pipefds[2] = { -1, -1 };
 
@@ -105,7 +106,7 @@ main(int argc, char *argv[])
 	char *progname;
 
 	memset(ccachesearch, 0, sizeof(ccachesearch));
-	while ((opt = getopt(argc, argv, "DfvrlmnMp:k:d:t:R:")) != -1) {
+	while ((opt = getopt(argc, argv, "DfvrlmnMp:k:d:t:T:R:")) != -1) {
 		switch (opt) {
 			case 'f':
 				fg = 1;
@@ -143,6 +144,9 @@ main(int argc, char *argv[])
 			case 't':
 				context_timeout = atoi(optarg);
 				break;
+			case 'T':
+				rpc_timeout = atoi(optarg);
+				break;
 			case 'R':
 				preferred_realm = strdup(optarg);
 				break;