From: Danny Mayer <mayer@ntp.org>
Date: Mon, 14 Feb 2005 05:26:43 +0000 (-0500)
Subject: Bug #214: Allow option on command line to specify specific interface only to be used
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c0500d085e9d38df472ec55ea9ac240f79beb32f;p=thirdparty%2Fntp.git

Bug #214: Allow option on command line to specify specific interface only to be used

bk: 421036935gCq3PHNT1cnGF-ZPudJuQ
---

diff --git a/ntpd/cmd_args.c b/ntpd/cmd_args.c
index d5ad2f4f6e..82f9e5820a 100644
--- a/ntpd/cmd_args.c
+++ b/ntpd/cmd_args.c
@@ -18,8 +18,9 @@
  */
 extern char const *progname;
 int	listen_to_virtual_ips = 1;
+char 	*specific_interface = NULL;        /* interface name or IP address to bind to */
 
-static const char *ntp_options = "aAbB:c:C:dD:f:gi:k:l:LnNO:p:P:qr:s:S:t:T:W:u:v:V:xY:Z:-:";
+static const char *ntp_options = "aAbB:c:C:dD:f:gi:k:l:L:nNO:p:P:qr:s:S:t:T:W:u:v:V:xY:Z:-:";
 
 #ifdef HAVE_NETINFO
 extern int	check_netinfo;
@@ -81,6 +82,8 @@ getstartup(
 #endif
 		case 'L':
 		    listen_to_virtual_ips = 0;
+		    if(ntp_optarg)
+			specific_interface = ntp_optarg; 
 		    break;
 		case 'l':
 			{
@@ -150,6 +153,7 @@ getstartup(
 		(void) fprintf(stderr, "\t\t[ -f freq_file ] [ -k key_file ] [ -l log_file ]\n");
 		(void) fprintf(stderr, "\t\t[ -p pid_file ] [ -r broad_delay ] [ -s statdir ]\n");
 		(void) fprintf(stderr, "\t\t[ -t trust_key ] [ -v sys_var ] [ -V default_sysvar ]\n");
+		(void) fprintf(stderr, "\t\t[ -L interface ]\n");
 #if defined(HAVE_SCHED_SETSCHEDULER)
 		(void) fprintf(stderr, "\t\t[ -P fixed_process_priority ]\n");
 #endif
@@ -397,6 +401,7 @@ getCmdOpts(
 		(void) fprintf(stderr, "\t\t[ -f freq_file ] [ -k key_file ] [ -l log_file ]\n");
 		(void) fprintf(stderr, "\t\t[ -p pid_file ] [ -r broad_delay ] [ -s statdir ]\n");
 		(void) fprintf(stderr, "\t\t[ -t trust_key ] [ -v sys_var ] [ -V default_sysvar ]\n");
+		(void) fprintf(stderr, "\t\t[ -L interface ]\n");
 #if defined(HAVE_SCHED_SETSCHEDULER)
 		(void) fprintf(stderr, "\t\t[ -P fixed_process_priority ]\n");
 #endif
diff --git a/ntpd/ntp_io.c b/ntpd/ntp_io.c
index 0f2342e25e..c1f0fff5fd 100644
--- a/ntpd/ntp_io.c
+++ b/ntpd/ntp_io.c
@@ -44,6 +44,7 @@
 */
 
 extern int listen_to_virtual_ips;
+extern const char *specific_interface;
 
 #if defined(SYS_WINNT)
 #include <transmitbuff.h>
@@ -404,9 +405,24 @@ address_okay(isc_interface_t *isc_if) {
 	    printf("address_okay: listen Virtual: %d, IF name: %s, Up Flag: %d\n", 
 		    listen_to_virtual_ips, isc_if->name, (isc_if->flags & INTERFACE_F_UP));
 #endif
+	/*
+	 * Always allow the loopback
+	 */
+	if((isc_if->flags & INTERFACE_F_LOOPBACK) != 0)
+		return (ISC_TRUE);
 
-	if (listen_to_virtual_ips == 0  && (strchr(isc_if->name, (int)':') != NULL))
-		return (ISC_FALSE);
+	/*
+	 * Check if the interface is specified
+	 */
+	if (specific_interface != NULL) {
+		if (stricmp(isc_if->name, specific_interface) == 0)
+			return (ISC_TRUE);
+	}
+	else {
+		if (listen_to_virtual_ips == 0  && 
+		   (strchr(isc_if->name, (int)':') != NULL))
+			return (ISC_FALSE);
+	}
 
 	/* XXXPDM This should be fixed later, but since we may not have set
 	 * the UP flag, we at least get to use the interface.
@@ -536,8 +552,10 @@ create_sockets(
 			netsyslog(LOG_ERR, "no IPv4 interfaces found");
 #endif
 #ifdef UDP_WILDCARD_DELIVERY
-	nwilds = create_wildcards(port);
-	idx = nwilds; 
+	if (specific_interface == NULL) {
+		nwilds = create_wildcards(port);
+		idx = nwilds;
+	}
 #endif
 
 	result = isc_interfaceiter_create(mctx, &iter);