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)

1 files changed, 151 insertions, 0 deletions

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;
+}