source/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
  22 /*
  23   return the time on a server. This does not require any authentication
  24 */
  25 static time_t cli_servertime(const char *host, struct sockaddr_storage *pss, int *zone)
  26 {
  27         struct nmb_name calling, called;
  28         time_t ret = 0;
  29         struct cli_state *cli = NULL;
  30         NTSTATUS status;
  31
  32         cli = cli_initialise();
  33         if (!cli) {
  34                 goto done;
  35         }
  36
  37         status = cli_connect(cli, host, pss);
  38         if (!NT_STATUS_IS_OK(status)) {
  39                 fprintf(stderr,"Can't contact server %s. Error %s\n", host, nt_errstr(status));
  40                 goto done;
  41         }
  42
  43         make_nmb_name(&calling, global_myname(), 0x0);
  44         if (host) {
  45                 make_nmb_name(&called, host, 0x20);
  46         } else {
  47                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  48         }
  49
  50         if (!cli_session_request(cli, &calling, &called)) {
  51                 fprintf(stderr,"Session request failed\n");
  52                 goto done;
  53         }
  54         if (!cli_negprot(cli)) {
  55                 fprintf(stderr,"Protocol negotiation failed\n");
  56                 goto done;
  57         }
  58
  59         ret = cli->servertime;
  60         if (zone) *zone = cli->serverzone;
  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         static fstring s;
  80         struct tm *tm;
  81
  82         tm = localtime(&t);
  83         if (!tm) {
  84                 return "unknown";
  85         }
  86
  87         fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d",
  88                  tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  89                  tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  90         return s;
  91 }
  92
  93 int net_time_usage(struct net_context *c, int argc, const char **argv)
  94 {
  95         d_printf(
  96 "net time\n\tdisplays time on a server\n\n"
  97 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"
  98 "net time set\n\truns /bin/date with the time from the server\n\n"
  99 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"
 100 "\n");
 101         net_common_flags_usage(c, argc, argv);
 102         return -1;
 103 }
 104
 105 /* try to set the system clock using /bin/date */
 106 static int net_time_set(struct net_context *c, int argc, const char **argv)
 107 {
 108         time_t t = nettime(c, NULL);
 109         char *cmd;
 110         int result;
 111
 112         if (t == 0) return -1;
 113
 114         /* yes, I know this is cheesy. Use "net time system" if you want to
 115            roll your own. I'm putting this in as it works on a large number
 116            of systems and the user has a choice in whether its used or not */
 117         asprintf(&cmd, "/bin/date %s", systime(t));
 118         result = system(cmd);
 119         if (result)
 120                 d_fprintf(stderr, "%s failed.  Error was (%s)\n",
 121                         cmd, strerror(errno));
 122         free(cmd);
 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("Usage:\n"
 134                          "net time system\n"
 135                          "    Output remote time server time in a format ready "
 136                          "for /bin/date\n");
 137                 return 0;
 138         }
 139
 140         t = nettime(c, NULL);
 141         if (t == 0) return -1;
 142
 143         printf("%s\n", systime(t));
 144
 145         return 0;
 146 }
 147
 148 /* display the remote time server's offset to UTC */
 149 static int net_time_zone(struct net_context *c, int argc, const char **argv)
 150 {
 151         int zone = 0;
 152         int hours, mins;
 153         char zsign;
 154         time_t t;
 155
 156         if (c->display_usage) {
 157                 d_printf("Usage:\n"
 158                          "net time zone\n"
 159                          "   Display the remote time server's offset to UTC\n");
 160                 return 0;
 161         }
 162
 163         t = nettime(c, &zone);
 164
 165         if (t == 0) return -1;
 166
 167         zsign = (zone > 0) ? '-' : '+';
 168         if (zone < 0) zone = -zone;
 169
 170         zone /= 60;
 171         hours = zone / 60;
 172         mins = zone % 60;
 173
 174         printf("%c%02d%02d\n", zsign, hours, mins);
 175
 176         return 0;
 177 }
 178
 179 /* display or set the time on a host */
 180 int net_time(struct net_context *c, int argc, const char **argv)
 181 {
 182         time_t t;
 183         struct functable3 func[] = {
 184                 {
 185                         "system",
 186                         net_time_system,
 187                         NET_TRANSPORT_LOCAL,
 188                         "Display time ready for /bin/date",
 189                         "net time system\n"
 190                         "    Display time ready for /bin/date"
 191                 },
 192                 {
 193                         "set",
 194                         net_time_set,
 195                         NET_TRANSPORT_LOCAL,
 196                         "Set the system time from time server",
 197                         "net time set\n"
 198                         "    Set the system time from time server"
 199                 },
 200                 {
 201                         "zone",
 202                         net_time_zone,
 203                         NET_TRANSPORT_LOCAL,
 204                         "Display timezone offset from UTC",
 205                         "net time zone\n"
 206                         "    Display timezone offset from UTC"
 207                 },
 208                 {NULL, NULL, 0, NULL, NULL}
 209         };
 210
 211         if (argc != 0) {
 212                 return net_run_function3(c, argc, argv, "net time", func);
 213         }
 214
 215         if (c->display_usage) {
 216                 d_printf("Usage:\n");
 217                 d_printf("net time\n"
 218                          "    Display the remote time server's time\n");
 219                 net_display_usage_from_functable(func);
 220                 return 0;
 221         }
 222
 223         if (!c->opt_host && !c->opt_have_ip &&
 224             !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) {
 225                 d_fprintf(stderr, "Could not locate a time server.  Try "
 226                                  "specifying a target host.\n");
 227                 net_time_usage(c, argc,argv);
 228                 return -1;
 229         }
 230
 231         /* default - print the time */
 232         t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL,
 233                            NULL);
 234         if (t == 0) return -1;
 235
 236         d_printf("%s", ctime(&t));
 237         return 0;
 238 }