[PATCH] rpcbind: set SO_REUSEADDR on NC_TPI_COTS listening sockets (resend)

[Jeff Layton <jlayton@redhat.com>]

I previously sent this patch to the libtirpc-devel list but got no
response. Resending with wider distribution...

If we don't set SO_REUSEADDR, then if there are any sockets on this port
in TIME_WAIT state when rpcbind is restarted then that will prevent the
bind() call from succeeding.

Details of the problem are here:

    https://bugzilla.redhat.com/show_bug.cgi?id=597356

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
 src/rpcbind.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/src/rpcbind.c b/src/rpcbind.c
index ddf2cfc..c8f0d9f 100644
--- a/src/rpcbind.c
+++ b/src/rpcbind.c
@@ -276,6 +276,7 @@ init_transport(struct netconfig *nconf)
 	int addrlen = 0;
 	int nhostsbak;
 	int checkbind;
+	int on = 1;
 	struct sockaddr *sa = NULL;
 	u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 	struct sockaddr_un sun;
@@ -493,6 +494,14 @@ init_transport(struct netconfig *nconf)
 		}
 		oldmask = umask(S_IXUSR|S_IXGRP|S_IXOTH);
 		__rpc_fd2sockinfo(fd, &si);
+		if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on,
+				sizeof(on)) != 0) {
+			syslog(LOG_ERR, "cannot set SO_REUSEADDR on %s",
+				nconf->nc_netid);
+			if (res != NULL)
+				freeaddrinfo(res);
+			return 1;
+		}
 		if (bind(fd, sa, addrlen) < 0) {
 			syslog(LOG_ERR, "cannot bind %s: %m", nconf->nc_netid);
 			if (res != NULL)
-- 
1.6.6.1