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/namequery.h"
  23 #include "libsmb/libsmb.h"
  24 #include "../libcli/smb/smbXcli_base.h"
  25
  26 /*
  27   return the time on a server. This does not require any authentication
  28 */
  29 static time_t cli_servertime(const char *host,
  30                              const struct sockaddr_storage *dest_ss,
  31                              int *zone)
  32 {
  33         time_t ret = 0;
  34         struct cli_state *cli = NULL;
  35         NTSTATUS status;
  36
  37         status = cli_connect_nb(host, dest_ss, 0, 0x20, lp_netbios_name(),
  38                                 SMB_SIGNING_DEFAULT, 0, &cli);
  39         if (!NT_STATUS_IS_OK(status)) {
  40                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
  41                         fprintf(stderr, "Can't contact server %s. NetBIOS support disabled,"
  42                                 " Error %s\n", host, nt_errstr(status));
  43                 } else {
  44                         fprintf(stderr, "Can't contact server %s. Error %s\n",
  45                                 host, nt_errstr(status));
  46                 }
  47                 goto done;
  48         }
  49
  50         status = smbXcli_negprot(cli->conn, cli->timeout, PROTOCOL_CORE,
  51                                  PROTOCOL_NT1);
  52         if (!NT_STATUS_IS_OK(status)) {
  53                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  54                         nt_errstr(status));
  55                 goto done;
  56         }
  57
  58         ret = cli_state_server_time(cli);
  59         if (zone) *zone = smb1cli_conn_server_time_zone(cli->conn);
  60
  61 done:
  62         if (cli) {
  63                 cli_shutdown(cli);
  64         }
  65         return ret;
  66 }
  67
  68 /* find the servers time on the opt_host host */
  69 static time_t nettime(struct net_context *c, int *zone)
  70 {
  71         return cli_servertime(c->opt_host,
  72                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  73 }
  74
  75 /* return a time as a string ready to be passed to /bin/date */
  76 static const char *systime(time_t t)
  77 {
  78         struct tm *tm;
  79
  80         tm = localtime(&t);
  81         if (!tm) {
  82                 return "unknown";
  83         }
  84
  85         return talloc_asprintf(talloc_tos(), "%02d%02d%02d%02d%04d.%02d",
  86                                tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  87                                tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  88 }
  89
  90 int net_time_usage(struct net_context *c, int argc, const char **argv)
  91 {
  92         d_printf(_(
  93 "net time\n\tdisplays time on a server (-S server)\n\n"
  94 "net time system\n\tdisplays time on a server (-S server) in a format ready for /bin/date\n\n"
  95 "net time set\n\truns /bin/date with the time from the server (-S server)\n\n"
  96 "net time zone\n\tdisplays the timezone in hours from GMT on the remote server (-S server)\n\n"
  97 "\n"));
  98         net_common_flags_usage(c, argc, argv);
  99         return -1;
 100 }
 101
 102 /* try to set the system clock */
 103 static int net_time_set(struct net_context *c, int argc, const char **argv)
 104 {
 105         struct timeval tv;
 106         int result;
 107
 108         if (c->display_usage || c->opt_host == NULL) {
 109                 d_printf(  "%s\n"
 110                            "net time set\n"
 111                            "    %s\n",
 112                          _("Usage:"),
 113                          _("Set local time to that of remote time "
 114                                 "server (-S server) "));
 115                 return 0;
 116         }
 117
 118         tv.tv_sec = nettime(c, NULL);
 119         tv.tv_usec=0;
 120
 121         if (tv.tv_sec == 0) return -1;
 122
 123         result = settimeofday(&tv,NULL);
 124
 125         if (result)
 126                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 127                         strerror(errno));
 128
 129         return result;
 130 }
 131
 132 /* display the time on a remote box in a format ready for /bin/date */
 133 static int net_time_system(struct net_context *c, int argc, const char **argv)
 134 {
 135         time_t t;
 136
 137         if (c->display_usage || c->opt_host == NULL) {
 138                 d_printf(  "%s\n"
 139                            "net time system\n"
 140                            "    %s\n",
 141                          _("Usage:"),
 142                          _("Output remote time server (-S server) "
 143                                 "time in a format ready for /bin/date"));
 144                 return 0;
 145         }
 146
 147         t = nettime(c, NULL);
 148         if (t == 0) return -1;
 149
 150         printf("%s\n", systime(t));
 151
 152         return 0;
 153 }
 154
 155 /* display the remote time server's offset to UTC */
 156 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 157 {
 158         int zone = 0;
 159         int hours, mins;
 160         char zsign;
 161         time_t t;
 162
 163         if (c->display_usage || c->opt_host == NULL) {
 164                 d_printf(  "%s\n"
 165                            "net time zone\n"
 166                            "   %s\n",
 167                          _("Usage:"),
 168                          _("Display the remote time server's (-S server) "
 169                                 "offset to UTC"));
 170                 return 0;
 171         }
 172
 173         t = nettime(c, &zone);
 174
 175         if (t == 0) return -1;
 176
 177         zsign = (zone > 0) ? '-' : '+';
 178         if (zone < 0) zone = -zone;
 179
 180         zone /= 60;
 181         hours = zone / 60;
 182         mins = zone % 60;
 183
 184         printf("%c%02d%02d\n", zsign, hours, mins);
 185
 186         return 0;
 187 }
 188
 189 /* display or set the time on a host */
 190 int net_time(struct net_context *c, int argc, const char **argv)
 191 {
 192         time_t t;
 193         struct functable func[] = {
 194                 {
 195                         "system",
 196                         net_time_system,
 197                         NET_TRANSPORT_LOCAL,
 198                         N_("Display time ready for /bin/date"),
 199                         N_("net time system\n"
 200                            "    Display time ready for /bin/date")
 201                 },
 202                 {
 203                         "set",
 204                         net_time_set,
 205                         NET_TRANSPORT_LOCAL,
 206                         N_("Set the system time from time server"),
 207                         N_("net time set\n"
 208                            "    Set the system time from time server")
 209                 },
 210                 {
 211                         "zone",
 212                         net_time_zone,
 213                         NET_TRANSPORT_LOCAL,
 214                         N_("Display timezone offset from UTC"),
 215                         N_("net time zone\n"
 216                            "    Display timezone offset from UTC")
 217                 },
 218                 {NULL, NULL, 0, NULL, NULL}
 219         };
 220
 221         if (argc != 0) {
 222                 return net_run_function(c, argc, argv, "net time", func);
 223         }
 224
 225         if (c->display_usage) {
 226                 d_printf(  "%s\n"
 227                            "net time\n"
 228                            "    %s\n",
 229                          _("Usage:"),
 230                          _("Display the remote time server's time"));
 231                 net_display_usage_from_functable(func);
 232                 return 0;
 233         }
 234
 235         if (c->opt_host == NULL && !c->opt_have_ip) {
 236                 bool ok;
 237
 238                 ok = find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip);
 239                 if (!ok) {
 240                         d_fprintf(stderr,
 241                                   _("Could not locate a time server.  "
 242                                     "Try specifying a target host.\n"));
 243                         net_time_usage(c, argc, argv);
 244                         return -1;
 245                 }
 246                 c->opt_have_ip = true;
 247         }
 248
 249         /* default - print the time */
 250         t = cli_servertime(c->opt_host,
 251                            c->opt_have_ip? &c->opt_dest_ip : NULL,
 252                            NULL);
 253         if (t == 0) return -1;
 254
 255         d_printf("%s", ctime(&t));
 256         return 0;
 257 }