source3/utils/net_time.c

   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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19 #include "includes.h"
  20 #include "utils/net.h"
  21 #include "libsmb/nmblib.h"
  22 #include "libsmb/libsmb.h"
  23
  24 /*
  25   return the time on a server. This does not require any authentication
  26 */
  27 static time_t cli_servertime(const char *host, struct sockaddr_storage *pss, int *zone)
  28 {
  29         time_t ret = 0;
  30         struct cli_state *cli = NULL;
  31         NTSTATUS status;
  32
  33         status = cli_connect_nb(host, pss, 0, 0x20, lp_netbios_name(),
  34                                 Undefined, &cli);
  35         if (!NT_STATUS_IS_OK(status)) {
  36                 fprintf(stderr, _("Can't contact server %s. Error %s\n"),
  37                         host, nt_errstr(status));
  38                 goto done;
  39         }
  40
  41         status = cli_negprot(cli);
  42         if (!NT_STATUS_IS_OK(status)) {
  43                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  44                         nt_errstr(status));
  45                 goto done;
  46         }
  47
  48         ret = cli->servertime;
  49         if (zone) *zone = cli->serverzone;
  50
  51 done:
  52         if (cli) {
  53                 cli_shutdown(cli);
  54         }
  55         return ret;
  56 }
  57
  58 /* find the servers time on the opt_host host */
  59 static time_t nettime(struct net_context *c, int *zone)
  60 {
  61         return cli_servertime(c->opt_host,
  62                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  63 }
  64
  65 /* return a time as a string ready to be passed to /bin/date */
  66 static const char *systime(time_t t)
  67 {
  68         struct tm *tm;
  69
  70         tm = localtime(&t);
  71         if (!tm) {
  72                 return "unknown";
  73         }
  74
  75         return talloc_asprintf(talloc_tos(), "%02d%02d%02d%02d%04d.%02d",
  76                                tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  77                                tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  78 }
  79
  80 int net_time_usage(struct net_context *c, int argc, const char **argv)
  81 {
  82         d_printf(_(
  83 "net time\n\tdisplays time on a server\n\n"
  84 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"
  85 "net time set\n\truns /bin/date with the time from the server\n\n"
  86 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"
  87 "\n"));
  88         net_common_flags_usage(c, argc, argv);
  89         return -1;
  90 }
  91
  92 /* try to set the system clock */
  93 static int net_time_set(struct net_context *c, int argc, const char **argv)
  94 {
  95         struct timeval tv;
  96         int result;
  97
  98         tv.tv_sec = nettime(c, NULL);
  99         tv.tv_usec=0;
 100
 101         if (tv.tv_sec == 0) return -1;
 102
 103         result = settimeofday(&tv,NULL);
 104
 105         if (result)
 106                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 107                         strerror(errno));
 108
 109         return result;
 110 }
 111
 112 /* display the time on a remote box in a format ready for /bin/date */
 113 static int net_time_system(struct net_context *c, int argc, const char **argv)
 114 {
 115         time_t t;
 116
 117         if (c->display_usage) {
 118                 d_printf(  "%s\n"
 119                            "net time system\n"
 120                            "    %s\n",
 121                          _("Usage:"),
 122                          _("Output remote time server time in a format "
 123                            "ready for /bin/date"));
 124                 return 0;
 125         }
 126
 127         t = nettime(c, NULL);
 128         if (t == 0) return -1;
 129
 130         printf("%s\n", systime(t));
 131
 132         return 0;
 133 }
 134
 135 /* display the remote time server's offset to UTC */
 136 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 137 {
 138         int zone = 0;
 139         int hours, mins;
 140         char zsign;
 141         time_t t;
 142
 143         if (c->display_usage) {
 144                 d_printf(  "%s\n"
 145                            "net time zone\n"
 146                            "   %s\n",
 147                          _("Usage:"),
 148                          _("Display the remote time server's offset to "
 149                            "UTC"));
 150                 return 0;
 151         }
 152
 153         t = nettime(c, &zone);
 154
 155         if (t == 0) return -1;
 156
 157         zsign = (zone > 0) ? '-' : '+';
 158         if (zone < 0) zone = -zone;
 159
 160         zone /= 60;
 161         hours = zone / 60;
 162         mins = zone % 60;
 163
 164         printf("%c%02d%02d\n", zsign, hours, mins);
 165
 166         return 0;
 167 }
 168
 169 /* display or set the time on a host */
 170 int net_time(struct net_context *c, int argc, const char **argv)
 171 {
 172         time_t t;
 173         struct functable func[] = {
 174                 {
 175                         "system",
 176                         net_time_system,
 177                         NET_TRANSPORT_LOCAL,
 178                         N_("Display time ready for /bin/date"),
 179                         N_("net time system\n"
 180                            "    Display time ready for /bin/date")
 181                 },
 182                 {
 183                         "set",
 184                         net_time_set,
 185                         NET_TRANSPORT_LOCAL,
 186                         N_("Set the system time from time server"),
 187                         N_("net time set\n"
 188                            "    Set the system time from time server")
 189                 },
 190                 {
 191                         "zone",
 192                         net_time_zone,
 193                         NET_TRANSPORT_LOCAL,
 194                         N_("Display timezone offset from UTC"),
 195                         N_("net time zone\n"
 196                            "    Display timezone offset from UTC")
 197                 },
 198                 {NULL, NULL, 0, NULL, NULL}
 199         };
 200
 201         if (argc != 0) {
 202                 return net_run_function(c, argc, argv, "net time", func);
 203         }
 204
 205         if (c->display_usage) {
 206                 d_printf(  "%s\n"
 207                            "net time\n"
 208                            "    %s\n",
 209                          _("Usage:"),
 210                          _("Display the remote time server's time"));
 211                 net_display_usage_from_functable(func);
 212                 return 0;
 213         }
 214
 215         if (!c->opt_host && !c->opt_have_ip &&
 216             !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) {
 217                 d_fprintf(stderr, _("Could not locate a time server.  Try "
 218                                     "specifying a target host.\n"));
 219                 net_time_usage(c, argc,argv);
 220                 return -1;
 221         }
 222
 223         /* default - print the time */
 224         t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL,
 225                            NULL);
 226         if (t == 0) return -1;
 227
 228         d_printf("%s", ctime(&t));
 229         return 0;
 230 }