added a net time command. Allow display or set of system time based on

a SMB server

particularly useful for ADS is:

	net time set -S DOMAIN#1B

this makes kerberos clock skew problems go away :)
(This used to be commit b3ba2293d0e4eac3b6408c3abc3dcacfa3f67fe4)

3 files changed, 166 insertions, 13 deletions

diff --git a/source3/utils/net.c b/source3/utils/net.c
index dab68ebefe..5a1bace8f1 100644
--- a/source3/utils/net.c
+++ b/source3/utils/net.c
@@ -71,8 +71,8 @@ int opt_jobid = 0;
 char *opt_target_workgroup = NULL;
 
 static BOOL got_pass = False;
-static BOOL have_ip = False;
-static struct in_addr dest_ip;
+BOOL opt_have_ip = False;
+struct in_addr opt_dest_ip;
 
 extern pstring global_myname;
 
@@ -156,10 +156,10 @@ static BOOL net_find_server(unsigned flags, struct in_addr *server_ip, char **se
 		*server_name = strdup(opt_host);
 	}		
 
-	if (have_ip) {
-		*server_ip = dest_ip;
+	if (opt_have_ip) {
+		*server_ip = opt_dest_ip;
 		if (!*server_name) {
-			*server_name = strdup(inet_ntoa(dest_ip));
+			*server_name = strdup(inet_ntoa(opt_dest_ip));
 		}
 	} else if (*server_name) {
 		/* resolve the IP address */
@@ -196,7 +196,7 @@ static BOOL net_find_server(unsigned flags, struct in_addr *server_ip, char **se
 		} else {
 			*server_ip = msbrow_ip;
 		}
-		*server_name = strdup(inet_ntoa(dest_ip));
+		*server_name = strdup(inet_ntoa(opt_dest_ip));
 	} else if (flags & NET_FLAGS_MASTER) {
 		struct in_addr brow_ips;
 		if (!resolve_name(opt_target_workgroup, &brow_ips, 0x1D))  {
@@ -206,7 +206,7 @@ static BOOL net_find_server(unsigned flags, struct in_addr *server_ip, char **se
 		} else {
 			*server_ip = brow_ips;
 		}
-		*server_name = strdup(inet_ntoa(dest_ip));
+		*server_name = strdup(inet_ntoa(opt_dest_ip));
 	} else if (!(flags & NET_FLAGS_LOCALHOST_DEFAULT_INSANE)) {
 		extern struct in_addr loopback_ip;
 		*server_ip = loopback_ip;
@@ -264,7 +264,7 @@ static int help_usage(int argc, const char **argv)
 "\n"\
 "Valid functions are:\n"\
 "  RPC RAP ADS FILE SHARE SESSION SERVER DOMAIN PRINTQ USER GROUP VALIDATE\n"\
-"  GROUPMEMBER ADMIN SERVICE PASSWORD\n");
+"  GROUPMEMBER ADMIN SERVICE PASSWORD TIME\n");
 	return -1;
 }
 
@@ -291,6 +291,7 @@ static int net_help(int argc, const char **argv)
 		{"ADMIN", net_rap_admin_usage},
 		{"SERVICE", net_rap_service_usage},
 		{"PASSWORD", net_rap_password_usage},
+		{"TIME", net_time_usage},
 
 		{"HELP", help_usage},
 		{NULL, NULL}};
@@ -318,6 +319,7 @@ static struct functable net_func[] = {
 	{"ADMIN", net_rap_admin},
 	{"SERVICE", net_rap_service},	
 	{"PASSWORD", net_rap_password},
+	{"TIME", net_time},
 
 	{"HELP", net_help},
 	{NULL, NULL}
@@ -359,7 +361,7 @@ static struct functable net_func[] = {
 	};
 
 	got_pass = 0;
-	zero_ip(&dest_ip);
+	zero_ip(&opt_dest_ip);
 
 	dbf = x_stdout;
 	
@@ -373,11 +375,11 @@ static struct functable net_func[] = {
 			exit(0);
 			break;
 		case 'I':
-			dest_ip = *interpret_addr2(poptGetOptArg(pc));
-			if (is_zero_ip(dest_ip))
+			opt_dest_ip = *interpret_addr2(poptGetOptArg(pc));
+			if (is_zero_ip(opt_dest_ip))
 				d_printf("\nInvalid ip address specified\n");
 			else
-				have_ip = True;
+				opt_have_ip = True;
 			break;
 		case 'U':
 			opt_user_name = strdup(opt_user_name);
diff --git a/source3/utils/net_rap.c b/source3/utils/net_rap.c
index 242d1ac9a1..b658c46d14 100644
--- a/source3/utils/net_rap.c
+++ b/source3/utils/net_rap.c
@@ -214,7 +214,7 @@ static const char *share_type[] = {
 
 /* End of weird 'strings at top of file' section */
 
-static int general_rap_usage(int argc, const char **argv)
+int general_rap_usage(int argc, const char **argv)
 {
 
 	d_printf("Valid targets: choose one (none defaults to using localhost)\n");
diff --git a/source3/utils/net_time.c b/source3/utils/net_time.c
new file mode 100644
index 0000000000..f7f3f894b0
--- /dev/null
+++ b/source3/utils/net_time.c
@@ -0,0 +1,151 @@
+/* 
+   Samba Unix/Linux SMB client library 
+   Version 3.0
+   net time command
+   Copyright (C) 2001 Andrew Tridgell (tridge@samba.org)
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "includes.h"
+#include "../utils/net.h"
+
+
+/*
+  return the time on a server. This does not require any authentication
+*/
+static time_t cli_servertime(const char *host, struct in_addr *ip)
+{
+	struct nmb_name calling, called;
+	time_t ret = 0;
+	extern pstring global_myname;
+	struct cli_state *cli = NULL;
+
+	cli = cli_initialise(NULL);
+	if (!cli || !cli_connect(cli, host, ip)) goto done;
+
+	make_nmb_name(&calling, global_myname, 0x0);
+	if (host) {
+		make_nmb_name(&called, host, 0x20);
+	} else {
+		make_nmb_name(&called, "*SMBSERVER", 0x20);
+	}
+
+	if (!cli_session_request(cli, &calling, &called)) goto done;
+	if (!cli_negprot(cli)) goto done;
+
+	ret = cli->servertime;
+
+	cli_shutdown(cli);
+
+done:
+	if (cli) cli_shutdown(cli);
+	return ret;
+}
+
+/* find the servers time on the opt_host host */
+static time_t nettime(void)
+{
+	extern BOOL opt_have_ip;
+	extern struct in_addr opt_dest_ip;
+	extern char *opt_host; 
+	return cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL);
+}
+
+/* return a time as a string ready to be passed to date -u */
+static char *systime(time_t t)
+{
+	static char s[100];
+	struct tm *tm;
+
+	tm = gmtime(&t);
+	
+	snprintf(s, sizeof(s), "%02d%02d%02d%02d%04d.%02d", 
+		 tm->tm_mon+1, tm->tm_mday, tm->tm_hour, 
+		 tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
+	return s;
+}
+
+int net_time_usage(int argc, const char **argv)
+{
+	d_printf(
+"net time\n\tdisplays time on a server\n\n"\
+"net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
+"net time set\n\truns /bin/date -u with the time from the server\n\n"\
+"\n");
+	general_rap_usage(argc, argv);
+	return -1;
+}
+
+/* try to set the system clock using /bin/date */
+static int net_time_set(int argc, const char **argv)
+{
+	time_t t = nettime();
+	char *cmd;
+
+	if (t == 0) {
+		d_printf("Can't contact server\n");
+		return -1;
+	}
+
+	asprintf(&cmd, "/bin/date -u %s", systime(t));
+	system(cmd);
+	free(cmd);
+
+	return 0;
+}
+
+/* display the time on a remote box in a format ready for /bin/date */
+static int net_time_system(int argc, const char **argv)
+{
+	time_t t = nettime();
+
+	if (t == 0) {
+		d_printf("Can't contact server\n");
+		return -1;
+	}
+
+	printf("%s\n", systime(t));
+
+	return 0;
+}
+
+/* display or set the time on a host */
+int net_time(int argc, const char **argv)
+{
+	time_t t;
+	extern BOOL opt_have_ip;
+	extern struct in_addr opt_dest_ip;
+	extern char *opt_host; 
+	struct functable func[] = {
+		{"SYSTEM", net_time_system},
+		{"SET", net_time_set},
+		{NULL, NULL}
+	};
+
+	if (!opt_host && !opt_have_ip) {
+		d_printf("You must specify a hostname or IP\n");
+		return -1;
+	}
+
+	if (argc != 0) {
+		return net_run_function(argc, argv, func, net_time_usage);
+	}
+
+	/* default - print the time */
+	t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL);
+
+	d_printf("%s", ctime(&t));
+	return 0;
+}