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,
  51                                  lp_client_min_protocol(),
  52                                  lp_client_max_protocol());
  53         if (!NT_STATUS_IS_OK(status)) {
  54                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  55                         nt_errstr(status));
  56                 goto done;
  57         }
  58
  59         ret = cli_state_server_time(cli);
  60         if (zone) *zone = smb1cli_conn_server_time_zone(cli->conn);
  61
  62 done:
  63         if (cli) {
  64                 cli_shutdown(cli);
  65         }
  66         return ret;
  67 }
  68
  69 /* find the servers time on the opt_host host */
  70 static time_t nettime(struct net_context *c, int *zone)
  71 {
  72         return cli_servertime(c->opt_host,
  73                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  74 }
  75
  76 /* return a time as a string ready to be passed to /bin/date */
  77 static const char *systime(time_t t)
  78 {
  79         struct tm *tm;
  80
  81         tm = localtime(&t);
  82         if (!tm) {
  83                 return "unknown";
  84         }
  85
  86         return talloc_asprintf(talloc_tos(), "%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 }
  90
  91 int net_time_usage(struct net_context *c, int argc, const char **argv)
  92 {
  93         d_printf(_(
  94 "net time\n\tdisplays time on a server (-S server)\n\n"
  95 "net time system\n\tdisplays time on a server (-S server) in a format ready for /bin/date\n\n"
  96 "net time set\n\truns /bin/date with the time from the server (-S server)\n\n"
  97 "net time zone\n\tdisplays the timezone in hours from GMT on the remote server (-S server)\n\n"
  98 "\n"));
  99         net_common_flags_usage(c, argc, argv);
 100         return -1;
 101 }
 102
 103 /* try to set the system clock */
 104 static int net_time_set(struct net_context *c, int argc, const char **argv)
 105 {
 106         struct timeval tv;
 107         int result;
 108
 109         if (c->display_usage || c->opt_host == NULL) {
 110                 d_printf(  "%s\n"
 111                            "net time set\n"
 112                            "    %s\n",
 113                          _("Usage:"),
 114                          _("Set local time to that of remote time "
 115                                 "server (-S server) "));
 116                 return 0;
 117         }
 118
 119         tv.tv_sec = nettime(c, NULL);
 120         tv.tv_usec=0;
 121
 122         if (tv.tv_sec == 0) return -1;
 123
 124         result = settimeofday(&tv,NULL);
 125
 126         if (result)
 127                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 128                         strerror(errno));
 129
 130         return result;
 131 }
 132
 133 /* display the time on a remote box in a format ready for /bin/date */
 134 static int net_time_system(struct net_context *c, int argc, const char **argv)
 135 {
 136         time_t t;
 137
 138         if (c->display_usage || c->opt_host == NULL) {
 139                 d_printf(  "%s\n"
 140                            "net time system\n"
 141                            "    %s\n",
 142                          _("Usage:"),
 143                          _("Output remote time server (-S server) "
 144                                 "time in a format ready for /bin/date"));
 145                 return 0;
 146         }
 147
 148         t = nettime(c, NULL);
 149         if (t == 0) return -1;
 150
 151         printf("%s\n", systime(t));
 152
 153         return 0;
 154 }
 155
 156 /* display the remote time server's offset to UTC */
 157 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 158 {
 159         int zone = 0;
 160         int hours, mins;
 161         char zsign;
 162         time_t t;
 163
 164         if (c->display_usage || c->opt_host == NULL) {
 165                 d_printf(  "%s\n"
 166                            "net time zone\n"
 167                            "   %s\n",
 168                          _("Usage:"),
 169                          _("Display the remote time server's (-S server) "
 170                                 "offset to UTC"));
 171                 return 0;
 172         }
 173
 174         t = nettime(c, &zone);
 175
 176         if (t == 0) return -1;
 177
 178         zsign = (zone > 0) ? '-' : '+';
 179         if (zone < 0) zone = -zone;
 180
 181         zone /= 60;
 182         hours = zone / 60;
 183         mins = zone % 60;
 184
 185         printf("%c%02d%02d\n", zsign, hours, mins);
 186
 187         return 0;
 188 }
 189
 190 /* display or set the time on a host */
 191 int net_time(struct net_context *c, int argc, const char **argv)
 192 {
 193         time_t t;
 194         struct functable func[] = {
 195                 {
 196                         "system",
 197                         net_time_system,
 198                         NET_TRANSPORT_LOCAL,
 199                         N_("Display time ready for /bin/date"),
 200                         N_("net time system\n"
 201                            "    Display time ready for /bin/date")
 202                 },
 203                 {
 204                         "set",
 205                         net_time_set,
 206                         NET_TRANSPORT_LOCAL,
 207                         N_("Set the system time from time server"),
 208                         N_("net time set\n"
 209                            "    Set the system time from time server")
 210                 },
 211                 {
 212                         "zone",
 213                         net_time_zone,
 214                         NET_TRANSPORT_LOCAL,
 215                         N_("Display timezone offset from UTC"),
 216                         N_("net time zone\n"
 217                            "    Display timezone offset from UTC")
 218                 },
 219                 {NULL, NULL, 0, NULL, NULL}
 220         };
 221
 222         if (argc != 0) {
 223                 return net_run_function(c, argc, argv, "net time", func);
 224         }
 225
 226         if (c->display_usage) {
 227                 d_printf(  "%s\n"
 228                            "net time\n"
 229                            "    %s\n",
 230                          _("Usage:"),
 231                          _("Display the remote time server's time"));
 232                 net_display_usage_from_functable(func);
 233                 return 0;
 234         }
 235
 236         if (c->opt_host == NULL && !c->opt_have_ip) {
 237                 bool ok;
 238
 239                 ok = find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip);
 240                 if (!ok) {
 241                         d_fprintf(stderr,
 242                                   _("Could not locate a time server.  "
 243                                     "Try specifying a target host.\n"));
 244                         net_time_usage(c, argc, argv);
 245                         return -1;
 246                 }
 247                 c->opt_have_ip = true;
 248         }
 249
 250         /* default - print the time */
 251         t = cli_servertime(c->opt_host,
 252                            c->opt_have_ip? &c->opt_dest_ip : NULL,
 253                            NULL);
 254         if (t == 0) return -1;
 255
 256         d_printf("%s", ctime(&t));
 257         return 0;
 258 }