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
  23 /*
  24   return the time on a server. This does not require any authentication
  25 */
  26 static time_t cli_servertime(const char *host, struct sockaddr_storage *pss, int *zone)
  27 {
  28         struct nmb_name calling, called;
  29         time_t ret = 0;
  30         struct cli_state *cli = NULL;
  31         NTSTATUS status;
  32
  33         cli = cli_initialise();
  34         if (!cli) {
  35                 goto done;
  36         }
  37
  38         status = cli_connect(cli, host, pss);
  39         if (!NT_STATUS_IS_OK(status)) {
  40                 fprintf(stderr, _("Can't contact server %s. Error %s\n"),
  41                         host, nt_errstr(status));
  42                 goto done;
  43         }
  44
  45         make_nmb_name(&calling, global_myname(), 0x0);
  46         if (host) {
  47                 make_nmb_name(&called, host, 0x20);
  48         } else {
  49                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  50         }
  51
  52         if (!cli_session_request(cli, &calling, &called)) {
  53                 fprintf(stderr, _("Session request failed\n"));
  54                 goto done;
  55         }
  56         status = cli_negprot(cli);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  59                         nt_errstr(status));
  60                 goto done;
  61         }
  62
  63         ret = cli->servertime;
  64         if (zone) *zone = cli->serverzone;
  65
  66 done:
  67         if (cli) {
  68                 cli_shutdown(cli);
  69         }
  70         return ret;
  71 }
  72
  73 /* find the servers time on the opt_host host */
  74 static time_t nettime(struct net_context *c, int *zone)
  75 {
  76         return cli_servertime(c->opt_host,
  77                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  78 }
  79
  80 /* return a time as a string ready to be passed to /bin/date */
  81 static const char *systime(time_t t)
  82 {
  83         struct tm *tm;
  84
  85         tm = localtime(&t);
  86         if (!tm) {
  87                 return "unknown";
  88         }
  89
  90         return talloc_asprintf(talloc_tos(), "%02d%02d%02d%02d%04d.%02d",
  91                                tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  92                                tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  93 }
  94
  95 int net_time_usage(struct net_context *c, int argc, const char **argv)
  96 {
  97         d_printf(_(
  98 "net time\n\tdisplays time on a server\n\n"
  99 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"
 100 "net time set\n\truns /bin/date with the time from the server\n\n"
 101 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"
 102 "\n"));
 103         net_common_flags_usage(c, argc, argv);
 104         return -1;
 105 }
 106
 107 /* try to set the system clock */
 108 static int net_time_set(struct net_context *c, int argc, const char **argv)
 109 {
 110         struct timeval tv;
 111         int result;
 112
 113         tv.tv_sec = nettime(c, NULL);
 114         tv.tv_usec=0;
 115
 116         if (tv.tv_sec == 0) return -1;
 117
 118         result = settimeofday(&tv,NULL);
 119
 120         if (result)
 121                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 122                         strerror(errno));
 123
 124         return result;
 125 }
 126
 127 /* display the time on a remote box in a format ready for /bin/date */
 128 static int net_time_system(struct net_context *c, int argc, const char **argv)
 129 {
 130         time_t t;
 131
 132         if (c->display_usage) {
 133                 d_printf(  "%s\n"
 134                            "net time system\n"
 135                            "    %s\n",
 136                          _("Usage:"),
 137                          _("Output remote time server time in a format "
 138                            "ready for /bin/date"));
 139                 return 0;
 140         }
 141
 142         t = nettime(c, NULL);
 143         if (t == 0) return -1;
 144
 145         printf("%s\n", systime(t));
 146
 147         return 0;
 148 }
 149
 150 /* display the remote time server's offset to UTC */
 151 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 152 {
 153         int zone = 0;
 154         int hours, mins;
 155         char zsign;
 156         time_t t;
 157
 158         if (c->display_usage) {
 159                 d_printf(  "%s\n"
 160                            "net time zone\n"
 161                            "   %s\n",
 162                          _("Usage:"),
 163                          _("Display the remote time server's offset to "
 164                            "UTC"));
 165                 return 0;
 166         }
 167
 168         t = nettime(c, &zone);
 169
 170         if (t == 0) return -1;
 171
 172         zsign = (zone > 0) ? '-' : '+';
 173         if (zone < 0) zone = -zone;
 174
 175         zone /= 60;
 176         hours = zone / 60;
 177         mins = zone % 60;
 178
 179         printf("%c%02d%02d\n", zsign, hours, mins);
 180
 181         return 0;
 182 }
 183
 184 /* display or set the time on a host */
 185 int net_time(struct net_context *c, int argc, const char **argv)
 186 {
 187         time_t t;
 188         struct functable func[] = {
 189                 {
 190                         "system",
 191                         net_time_system,
 192                         NET_TRANSPORT_LOCAL,
 193                         N_("Display time ready for /bin/date"),
 194                         N_("net time system\n"
 195                            "    Display time ready for /bin/date")
 196                 },
 197                 {
 198                         "set",
 199                         net_time_set,
 200                         NET_TRANSPORT_LOCAL,
 201                         N_("Set the system time from time server"),
 202                         N_("net time set\n"
 203                            "    Set the system time from time server")
 204                 },
 205                 {
 206                         "zone",
 207                         net_time_zone,
 208                         NET_TRANSPORT_LOCAL,
 209                         N_("Display timezone offset from UTC"),
 210                         N_("net time zone\n"
 211                            "    Display timezone offset from UTC")
 212                 },
 213                 {NULL, NULL, 0, NULL, NULL}
 214         };
 215
 216         if (argc != 0) {
 217                 return net_run_function(c, argc, argv, "net time", func);
 218         }
 219
 220         if (c->display_usage) {
 221                 d_printf(  "%s\n"
 222                            "net time\n"
 223                            "    %s\n",
 224                          _("Usage:"),
 225                          _("Display the remote time server's time"));
 226                 net_display_usage_from_functable(func);
 227                 return 0;
 228         }
 229
 230         if (!c->opt_host && !c->opt_have_ip &&
 231             !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) {
 232                 d_fprintf(stderr, _("Could not locate a time server.  Try "
 233                                     "specifying a target host.\n"));
 234                 net_time_usage(c, argc,argv);
 235                 return -1;
 236         }
 237
 238         /* default - print the time */
 239         t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL,
 240                            NULL);
 241         if (t == 0) return -1;
 242
 243         d_printf("%s", ctime(&t));
 244         return 0;
 245 }