rpcbind: Add option to disable local host binding

In our products, we need those options to support our features.

Add daemon mode option for mountd, nfsd.
Add skip local host binding option for rpcd.
Add skip local host binding option for mountd.

Reviewed by:	rmacklem
Differential Revision:	https://reviews.freebsd.org/D45118

usr.sbin/rpcbind/rpcbind.c

@@ -88,6 +88,7 @@ int libwrap = 0;
 #endif
 int nofork = 0;
 int verboselog = 0;
+int nobind_localhost = 0;
 
 static char **hosts = NULL;
 static struct sockaddr **bound_sa;
@@ -342,9 +343,9 @@ init_transport(struct netconfig *nconf)
 	    if (nhostsbak == 1)
 	        hosts[0] = "*";
 	    else {
-		if (hints.ai_family == AF_INET) {
+		if (hints.ai_family == AF_INET && nobind_localhost == 0) {
 		    hosts[nhostsbak - 1] = "127.0.0.1";
-		} else if (hints.ai_family == AF_INET6) {
+		} else if (hints.ai_family == AF_INET6 && nobind_localhost == 0) {
 		    hosts[nhostsbak - 1] = "::1";
 		} else
 		    return 1;
@@ -802,7 +803,7 @@ parseargs(int argc, char *argv[])
 #else
 #define WRAPOP	""
 #endif
-	while ((c = getopt(argc, argv, "6adh:iLlNs" WRAPOP WSOP)) != -1) {
+	while ((c = getopt(argc, argv, "6adh:IiLlNs" WRAPOP WSOP)) != -1) {
 		switch (c) {
 		case '6':
 			ipv6_only = 1;
@@ -823,6 +824,9 @@ parseargs(int argc, char *argv[])
 			if (hosts[nhosts - 1] == NULL)
 				errx(1, "Out of memory");
 			break;
+		case 'I':
+			nobind_localhost = 1;
+			break;
 		case 'i':
 			insecure = 1;
 			break;
@@ -850,7 +854,7 @@ parseargs(int argc, char *argv[])
 #endif
 		default:	/* error */
 			fprintf(stderr,
-			    "usage: rpcbind [-6adiLls%s%s] [-h bindip]\n",
+			    "usage: rpcbind [-6adIiLls%s%s] [-h bindip]\n",
 			    WRAPOP, WSOP);
 			exit (1);
 		}