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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "includes.h"
  21 #include "utils/net.h"
  22
  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 in_addr *ip, 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, ip);
  40         if (!NT_STATUS_IS_OK(status)) {
  41                 fprintf(stderr,"Can't contact server %s. Error %s\n", 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         if (!cli_negprot(cli)) {
  57                 fprintf(stderr,"Protocol negotiation failed\n");
  58                 goto done;
  59         }
  60
  61         ret = cli->servertime;
  62         if (zone) *zone = cli->serverzone;
  63
  64 done:
  65         if (cli) {
  66                 cli_shutdown(cli);
  67         }
  68         return ret;
  69 }
  70
  71 /* find the servers time on the opt_host host */
  72 static time_t nettime(int *zone)
  73 {
  74         return cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, zone);
  75 }
  76
  77 /* return a time as a string ready to be passed to /bin/date */
  78 static const char *systime(time_t t)
  79 {
  80         static fstring s;
  81         struct tm *tm;
  82
  83         tm = localtime(&t);
  84         if (!tm) {
  85                 return "unknown";
  86         }
  87
  88         fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d",
  89                  tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  90                  tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  91         return s;
  92 }
  93
  94 int net_time_usage(int argc, const char **argv)
  95 {
  96         d_printf(
  97 "net time\n\tdisplays time on a server\n\n"\
  98 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
  99 "net time set\n\truns /bin/date with the time from the server\n\n"\
 100 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"\
 101 "\n");
 102         net_common_flags_usage(argc, argv);
 103         return -1;
 104 }
 105
 106 /* try to set the system clock using /bin/date */
 107 static int net_time_set(int argc, const char **argv)
 108 {
 109         time_t t = nettime(NULL);
 110         char *cmd;
 111         int result;
 112
 113         if (t == 0) return -1;
 114
 115         /* yes, I know this is cheesy. Use "net time system" if you want to
 116            roll your own. I'm putting this in as it works on a large number
 117            of systems and the user has a choice in whether its used or not */
 118         asprintf(&cmd, "/bin/date %s", systime(t));
 119         result = system(cmd);
 120         if (result)
 121                 d_fprintf(stderr, "%s failed.  Error was (%s)\n",
 122                         cmd, strerror(errno));
 123         free(cmd);
 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(int argc, const char **argv)
 130 {
 131         time_t t = nettime(NULL);
 132
 133         if (t == 0) return -1;
 134
 135         printf("%s\n", systime(t));
 136
 137         return 0;
 138 }
 139
 140 /* display the time on a remote box in a format ready for /bin/date */
 141 static int net_time_zone(int argc, const char **argv)
 142 {
 143         int zone = 0;
 144         int hours, mins;
 145         char zsign;
 146         time_t t;
 147
 148         t = nettime(&zone);
 149
 150         if (t == 0) return -1;
 151
 152         zsign = (zone > 0) ? '-' : '+';
 153         if (zone < 0) zone = -zone;
 154
 155         zone /= 60;
 156         hours = zone / 60;
 157         mins = zone % 60;
 158
 159         printf("%c%02d%02d\n", zsign, hours, mins);
 160
 161         return 0;
 162 }
 163
 164 /* display or set the time on a host */
 165 int net_time(int argc, const char **argv)
 166 {
 167         time_t t;
 168         struct functable func[] = {
 169                 {"SYSTEM", net_time_system},
 170                 {"SET", net_time_set},
 171                 {"ZONE", net_time_zone},
 172                 {NULL, NULL}
 173         };
 174
 175         if (!opt_host && !opt_have_ip &&
 176             !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
 177                 d_fprintf(stderr, "Could not locate a time server.  Try "\
 178                                  "specifying a target host.\n");
 179                 net_time_usage(argc,argv);
 180                 return -1;
 181         }
 182
 183         if (argc != 0) {
 184                 return net_run_function(argc, argv, func, net_time_usage);
 185         }
 186
 187         /* default - print the time */
 188         t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
 189         if (t == 0) return -1;
 190
 191         d_printf("%s", ctime(&t));
 192         return 0;
 193 }