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, struct sockaddr_storage *pss, int *zone)
  28 {
  29         struct nmb_name calling, called;
  30         time_t ret = 0;
  31         struct cli_state *cli = NULL;
  32         NTSTATUS status;
  33
  34         cli = cli_initialise();
  35         if (!cli) {
  36                 goto done;
  37         }
  38
  39         status = cli_connect(cli, host, pss);
  40         if (!NT_STATUS_IS_OK(status)) {
  41                 fprintf(stderr, _("Can't contact server %s. Error %s\n"),
  42                         host, nt_errstr(status));
  43                 goto done;
  44         }
  45
  46         make_nmb_name(&calling, global_myname(), 0x0);
  47         if (host) {
  48                 make_nmb_name(&called, host, 0x20);
  49         } else {
  50                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  51         }
  52
  53         if (!cli_session_request(cli, &calling, &called)) {
  54                 fprintf(stderr, _("Session request failed\n"));
  55                 goto done;
  56         }
  57         status = cli_negprot(cli);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 fprintf(stderr, _("Protocol negotiation failed: %s\n"),
  60                         nt_errstr(status));
  61                 goto done;
  62         }
  63
  64         ret = cli->servertime;
  65         if (zone) *zone = cli->serverzone;
  66
  67 done:
  68         if (cli) {
  69                 cli_shutdown(cli);
  70         }
  71         return ret;
  72 }
  73
  74 /* find the servers time on the opt_host host */
  75 static time_t nettime(struct net_context *c, int *zone)
  76 {
  77         return cli_servertime(c->opt_host,
  78                               c->opt_have_ip? &c->opt_dest_ip : NULL, zone);
  79 }
  80
  81 /* return a time as a string ready to be passed to /bin/date */
  82 static const char *systime(time_t t)
  83 {
  84         struct tm *tm;
  85
  86         tm = localtime(&t);
  87         if (!tm) {
  88                 return "unknown";
  89         }
  90
  91         return talloc_asprintf(talloc_tos(), "%02d%02d%02d%02d%04d.%02d",
  92                                tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  93                                tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  94 }
  95
  96 int net_time_usage(struct net_context *c, int argc, const char **argv)
  97 {
  98         d_printf(_(
  99 "net time\n\tdisplays time on a server\n\n"
 100 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"
 101 "net time set\n\truns /bin/date with the time from the server\n\n"
 102 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"
 103 "\n"));
 104         net_common_flags_usage(c, argc, argv);
 105         return -1;
 106 }
 107
 108 /* try to set the system clock */
 109 static int net_time_set(struct net_context *c, int argc, const char **argv)
 110 {
 111         struct timeval tv;
 112         int result;
 113
 114         tv.tv_sec = nettime(c, NULL);
 115         tv.tv_usec=0;
 116
 117         if (tv.tv_sec == 0) return -1;
 118
 119         result = settimeofday(&tv,NULL);
 120
 121         if (result)
 122                 d_fprintf(stderr, _("setting system clock failed.  Error was (%s)\n"),
 123                         strerror(errno));
 124
 125         return result;
 126 }
 127
 128 /* display the time on a remote box in a format ready for /bin/date */
 129 static int net_time_system(struct net_context *c, int argc, const char **argv)
 130 {
 131         time_t t;
 132
 133         if (c->display_usage) {
 134                 d_printf(  "%s\n"
 135                            "net time system\n"
 136                            "    %s\n",
 137                          _("Usage:"),
 138                          _("Output remote time server time in a format "
 139                            "ready for /bin/date"));
 140                 return 0;
 141         }
 142
 143         t = nettime(c, NULL);
 144         if (t == 0) return -1;
 145
 146         printf("%s\n", systime(t));
 147
 148         return 0;
 149 }
 150
 151 /* display the remote time server's offset to UTC */
 152 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 153 {
 154         int zone = 0;
 155         int hours, mins;
 156         char zsign;
 157         time_t t;
 158
 159         if (c->display_usage) {
 160                 d_printf(  "%s\n"
 161                            "net time zone\n"
 162                            "   %s\n",
 163                          _("Usage:"),
 164                          _("Display the remote time server's offset to "
 165                            "UTC"));
 166                 return 0;
 167         }
 168
 169         t = nettime(c, &zone);
 170
 171         if (t == 0) return -1;
 172
 173         zsign = (zone > 0) ? '-' : '+';
 174         if (zone < 0) zone = -zone;
 175
 176         zone /= 60;
 177         hours = zone / 60;
 178         mins = zone % 60;
 179
 180         printf("%c%02d%02d\n", zsign, hours, mins);
 181
 182         return 0;
 183 }
 184
 185 /* display or set the time on a host */
 186 int net_time(struct net_context *c, int argc, const char **argv)
 187 {
 188         time_t t;
 189         struct functable func[] = {
 190                 {
 191                         "system",
 192                         net_time_system,
 193                         NET_TRANSPORT_LOCAL,
 194                         N_("Display time ready for /bin/date"),
 195                         N_("net time system\n"
 196                            "    Display time ready for /bin/date")
 197                 },
 198                 {
 199                         "set",
 200                         net_time_set,
 201                         NET_TRANSPORT_LOCAL,
 202                         N_("Set the system time from time server"),
 203                         N_("net time set\n"
 204                            "    Set the system time from time server")
 205                 },
 206                 {
 207                         "zone",
 208                         net_time_zone,
 209                         NET_TRANSPORT_LOCAL,
 210                         N_("Display timezone offset from UTC"),
 211                         N_("net time zone\n"
 212                            "    Display timezone offset from UTC")
 213                 },
 214                 {NULL, NULL, 0, NULL, NULL}
 215         };
 216
 217         if (argc != 0) {
 218                 return net_run_function(c, argc, argv, "net time", func);
 219         }
 220
 221         if (c->display_usage) {
 222                 d_printf(  "%s\n"
 223                            "net time\n"
 224                            "    %s\n",
 225                          _("Usage:"),
 226                          _("Display the remote time server's time"));
 227                 net_display_usage_from_functable(func);
 228                 return 0;
 229         }
 230
 231         if (!c->opt_host && !c->opt_have_ip &&
 232             !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) {
 233                 d_fprintf(stderr, _("Could not locate a time server.  Try "
 234                                     "specifying a target host.\n"));
 235                 net_time_usage(c, argc,argv);
 236                 return -1;
 237         }
 238
 239         /* default - print the time */
 240         t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL,
 241                            NULL);
 242         if (t == 0) return -1;
 243
 244         d_printf("%s", ctime(&t));
 245         return 0;
 246 }