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,
  28                              const struct sockaddr_storage *dest_ss,
  29                              int *zone)
  30 {
  31         time_t ret = 0;
  32         struct cli_state *cli = NULL;
  33         NTSTATUS status;
  34
  35         status = cli_connect_nb(host, dest_ss, 0, 0x20, lp_netbios_name(),
  36                                 Undefined, &cli);
  37         if (!NT_STATUS_IS_OK(status)) {
  38                 fprintf(stderr, _("Can't contact server %s. Error %s\n"),
  39                         host, nt_errstr(status));
  40                 goto done;
  41         }
  42
  43         status = cli_negprot(cli);
  44         if (!NT_STATUS_IS_OK(status)) {
  45                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  46                         nt_errstr(status));
  47                 goto done;
  48         }
  49
  50         ret = cli->servertime;
  51         if (zone) *zone = cli->serverzone;
  52
  53 done:
  54         if (cli) {
  55                 cli_shutdown(cli);
  56         }
  57         return ret;
  58 }
  59
  60 /* find the servers time on the opt_host host */
  61 static time_t nettime(struct net_context *c, int *zone)
  62 {
  63         return cli_servertime(c->opt_host,
  64                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  65 }
  66
  67 /* return a time as a string ready to be passed to /bin/date */
  68 static const char *systime(time_t t)
  69 {
  70         struct tm *tm;
  71
  72         tm = localtime(&t);
  73         if (!tm) {
  74                 return "unknown";
  75         }
  76
  77         return talloc_asprintf(talloc_tos(), "%02d%02d%02d%02d%04d.%02d",
  78                                tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  79                                tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  80 }
  81
  82 int net_time_usage(struct net_context *c, int argc, const char **argv)
  83 {
  84         d_printf(_(
  85 "net time\n\tdisplays time on a server\n\n"
  86 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"
  87 "net time set\n\truns /bin/date with the time from the server\n\n"
  88 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"
  89 "\n"));
  90         net_common_flags_usage(c, argc, argv);
  91         return -1;
  92 }
  93
  94 /* try to set the system clock */
  95 static int net_time_set(struct net_context *c, int argc, const char **argv)
  96 {
  97         struct timeval tv;
  98         int result;
  99
 100         tv.tv_sec = nettime(c, NULL);
 101         tv.tv_usec=0;
 102
 103         if (tv.tv_sec == 0) return -1;
 104
 105         result = settimeofday(&tv,NULL);
 106
 107         if (result)
 108                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 109                         strerror(errno));
 110
 111         return result;
 112 }
 113
 114 /* display the time on a remote box in a format ready for /bin/date */
 115 static int net_time_system(struct net_context *c, int argc, const char **argv)
 116 {
 117         time_t t;
 118
 119         if (c->display_usage) {
 120                 d_printf(  "%s\n"
 121                            "net time system\n"
 122                            "    %s\n",
 123                          _("Usage:"),
 124                          _("Output remote time server time in a format "
 125                            "ready for /bin/date"));
 126                 return 0;
 127         }
 128
 129         t = nettime(c, NULL);
 130         if (t == 0) return -1;
 131
 132         printf("%s\n", systime(t));
 133
 134         return 0;
 135 }
 136
 137 /* display the remote time server's offset to UTC */
 138 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 139 {
 140         int zone = 0;
 141         int hours, mins;
 142         char zsign;
 143         time_t t;
 144
 145         if (c->display_usage) {
 146                 d_printf(  "%s\n"
 147                            "net time zone\n"
 148                            "   %s\n",
 149                          _("Usage:"),
 150                          _("Display the remote time server's offset to "
 151                            "UTC"));
 152                 return 0;
 153         }
 154
 155         t = nettime(c, &zone);
 156
 157         if (t == 0) return -1;
 158
 159         zsign = (zone > 0) ? '-' : '+';
 160         if (zone < 0) zone = -zone;
 161
 162         zone /= 60;
 163         hours = zone / 60;
 164         mins = zone % 60;
 165
 166         printf("%c%02d%02d\n", zsign, hours, mins);
 167
 168         return 0;
 169 }
 170
 171 /* display or set the time on a host */
 172 int net_time(struct net_context *c, int argc, const char **argv)
 173 {
 174         time_t t;
 175         struct functable func[] = {
 176                 {
 177                         "system",
 178                         net_time_system,
 179                         NET_TRANSPORT_LOCAL,
 180                         N_("Display time ready for /bin/date"),
 181                         N_("net time system\n"
 182                            "    Display time ready for /bin/date")
 183                 },
 184                 {
 185                         "set",
 186                         net_time_set,
 187                         NET_TRANSPORT_LOCAL,
 188                         N_("Set the system time from time server"),
 189                         N_("net time set\n"
 190                            "    Set the system time from time server")
 191                 },
 192                 {
 193                         "zone",
 194                         net_time_zone,
 195                         NET_TRANSPORT_LOCAL,
 196                         N_("Display timezone offset from UTC"),
 197                         N_("net time zone\n"
 198                            "    Display timezone offset from UTC")
 199                 },
 200                 {NULL, NULL, 0, NULL, NULL}
 201         };
 202
 203         if (argc != 0) {
 204                 return net_run_function(c, argc, argv, "net time", func);
 205         }
 206
 207         if (c->display_usage) {
 208                 d_printf(  "%s\n"
 209                            "net time\n"
 210                            "    %s\n",
 211                          _("Usage:"),
 212                          _("Display the remote time server's time"));
 213                 net_display_usage_from_functable(func);
 214                 return 0;
 215         }
 216
 217         if (!c->opt_host && !c->opt_have_ip &&
 218             !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) {
 219                 d_fprintf(stderr, _("Could not locate a time server.  Try "
 220                                     "specifying a target host.\n"));
 221                 net_time_usage(c, argc,argv);
 222                 return -1;
 223         }
 224
 225         /* default - print the time */
 226         t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL,
 227                            NULL);
 228         if (t == 0) return -1;
 229
 230         d_printf("%s", ctime(&t));
 231         return 0;
 232 }