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