1/*
2   Samba Unix/Linux SMB client library
3   net time command
4   Copyright (C) 2001 Andrew Tridgell (tridge@samba.org)
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
19
20#include "includes.h"
21#include "utils/net.h"
22
23
24/*
25  return the time on a server. This does not require any authentication
26*/
27static time_t cli_servertime(const char *host, struct in_addr *ip, int *zone)
28{
29	struct nmb_name calling, called;
30	time_t ret = 0;
31	struct cli_state *cli = NULL;
32
33	cli = cli_initialise();
34	if (!cli) {
35		goto done;
36	}
37
38	if (!cli_connect(cli, host, ip)) {
39		fprintf(stderr,"Can't contact server\n");
40		goto done;
41	}
42
43	make_nmb_name(&calling, global_myname(), 0x0);
44	if (host) {
45		make_nmb_name(&called, host, 0x20);
46	} else {
47		make_nmb_name(&called, "*SMBSERVER", 0x20);
48	}
49
50	if (!cli_session_request(cli, &calling, &called)) {
51		fprintf(stderr,"Session request failed\n");
52		goto done;
53	}
54	if (!cli_negprot(cli)) {
55		fprintf(stderr,"Protocol negotiation failed\n");
56		goto done;
57	}
58
59	ret = cli->servertime;
60	if (zone) *zone = cli->serverzone;
61
62done:
63	if (cli) {
64		cli_shutdown(cli);
65	}
66	return ret;
67}
68
69/* find the servers time on the opt_host host */
70static time_t nettime(int *zone)
71{
72	return cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, zone);
73}
74
75/* return a time as a string ready to be passed to /bin/date */
76static const char *systime(time_t t)
77{
78	static fstring s;
79	struct tm *tm;
80
81	tm = localtime(&t);
82	if (!tm) {
83		return "unknown";
84	}
85
86	fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d",
87		 tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
88		 tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
89	return s;
90}
91
92int net_time_usage(int argc, const char **argv)
93{
94	d_printf(
95"net time\n\tdisplays time on a server\n\n"\
96"net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
97"net time set\n\truns /bin/date with the time from the server\n\n"\
98"net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"\
99"\n");
100	net_common_flags_usage(argc, argv);
101	return -1;
102}
103
104/* try to set the system clock using /bin/date */
105static int net_time_set(int argc, const char **argv)
106{
107	time_t t = nettime(NULL);
108	char *cmd;
109	int result;
110
111	if (t == 0) return -1;
112
113	/* yes, I know this is cheesy. Use "net time system" if you want to
114	   roll your own. I'm putting this in as it works on a large number
115	   of systems and the user has a choice in whether its used or not */
116	asprintf(&cmd, "/bin/date %s", systime(t));
117	result = system(cmd);
118	if (result)
119		d_fprintf(stderr, "%s failed.  Error was (%s)\n",
120			cmd, strerror(errno));
121	free(cmd);
122
123	return result;
124}
125
126/* display the time on a remote box in a format ready for /bin/date */
127static int net_time_system(int argc, const char **argv)
128{
129	time_t t = nettime(NULL);
130
131	if (t == 0) return -1;
132
133	printf("%s\n", systime(t));
134
135	return 0;
136}
137
138/* display the time on a remote box in a format ready for /bin/date */
139static int net_time_zone(int argc, const char **argv)
140{
141	int zone = 0;
142	int hours, mins;
143	char zsign;
144	time_t t;
145
146	t = nettime(&zone);
147
148	if (t == 0) return -1;
149
150	zsign = (zone > 0) ? '-' : '+';
151	if (zone < 0) zone = -zone;
152
153	zone /= 60;
154	hours = zone / 60;
155	mins = zone % 60;
156
157	printf("%c%02d%02d\n", zsign, hours, mins);
158
159	return 0;
160}
161
162/* display or set the time on a host */
163int net_time(int argc, const char **argv)
164{
165	time_t t;
166	struct functable func[] = {
167		{"SYSTEM", net_time_system},
168		{"SET", net_time_set},
169		{"ZONE", net_time_zone},
170		{NULL, NULL}
171	};
172
173	if (!opt_host && !opt_have_ip &&
174	    !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
175		d_fprintf(stderr, "Could not locate a time server.  Try "\
176				 "specifying a target host.\n");
177		net_time_usage(argc,argv);
178		return -1;
179	}
180
181	if (argc != 0) {
182		return net_run_function(argc, argv, func, net_time_usage);
183	}
184
185	/* default - print the time */
186	t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
187	if (t == 0) return -1;
188
189	d_printf("%s", ctime(&t));
190	return 0;
191}
192