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 /*
  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", host, nt_errstr(status));
  41                 goto done;
  42         }
  43
  44         make_nmb_name(&calling, global_myname(), 0x0);
  45         if (host) {
  46                 make_nmb_name(&called, host, 0x20);
  47         } else {
  48                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  49         }
  50
  51         if (!cli_session_request(cli, &calling, &called)) {
  52                 fprintf(stderr,"Session request failed\n");
  53                 goto done;
  54         }
  55         if (!cli_negprot(cli)) {
  56                 fprintf(stderr,"Protocol negotiation failed\n");
  57                 goto done;
  58         }
  59
  60         ret = cli->servertime;
  61         if (zone) *zone = cli->serverzone;
  62
  63 done:
  64         if (cli) {
  65                 cli_shutdown(cli);
  66         }
  67         return ret;
  68 }
  69
  70 /* find the servers time on the opt_host host */
  71 static time_t nettime(int *zone)
  72 {
  73         return cli_servertime(opt_host, opt_have_ip? &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(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(argc, argv);
 102         return -1;
 103 }
 104
 105 /* try to set the system clock using /bin/date */
 106 static int net_time_set(int argc, const char **argv)
 107 {
 108         time_t t = nettime(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(int argc, const char **argv)
 129 {
 130         time_t t = nettime(NULL);
 131
 132         if (t == 0) return -1;
 133
 134         printf("%s\n", systime(t));
 135
 136         return 0;
 137 }
 138
 139 /* display the time on a remote box in a format ready for /bin/date */
 140 static int net_time_zone(int argc, const char **argv)
 141 {
 142         int zone = 0;
 143         int hours, mins;
 144         char zsign;
 145         time_t t;
 146
 147         t = nettime(&zone);
 148
 149         if (t == 0) return -1;
 150
 151         zsign = (zone > 0) ? '-' : '+';
 152         if (zone < 0) zone = -zone;
 153
 154         zone /= 60;
 155         hours = zone / 60;
 156         mins = zone % 60;
 157
 158         printf("%c%02d%02d\n", zsign, hours, mins);
 159
 160         return 0;
 161 }
 162
 163 /* display or set the time on a host */
 164 int net_time(int argc, const char **argv)
 165 {
 166         time_t t;
 167         struct functable func[] = {
 168                 {"SYSTEM", net_time_system},
 169                 {"SET", net_time_set},
 170                 {"ZONE", net_time_zone},
 171                 {NULL, NULL}
 172         };
 173
 174         if (!opt_host && !opt_have_ip &&
 175             !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
 176                 d_fprintf(stderr, "Could not locate a time server.  Try "\
 177                                  "specifying a target host.\n");
 178                 net_time_usage(argc,argv);
 179                 return -1;
 180         }
 181
 182         if (argc != 0) {
 183                 return net_run_function(argc, argv, func, net_time_usage);
 184         }
 185
 186         /* default - print the time */
 187         t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
 188         if (t == 0) return -1;
 189
 190         d_printf("%s", ctime(&t));
 191         return 0;
 192 }