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
  33         cli = cli_initialise(NULL);
  34         if (!cli) goto done;
  35
  36         if (!cli_connect(cli, host, ip)) {
  37                 fprintf(stderr,"Can't contact server\n");
  38                 goto done;
  39         }
  40
  41         make_nmb_name(&calling, global_myname(), 0x0);
  42         if (host) {
  43                 make_nmb_name(&called, host, 0x20);
  44         } else {
  45                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  46         }
  47
  48         if (!cli_session_request(cli, &calling, &called)) {
  49                 fprintf(stderr,"Session request failed\n");
  50                 goto done;
  51         }
  52         if (!cli_negprot(cli)) {
  53                 fprintf(stderr,"Protocol negotiation failed\n");
  54                 goto done;
  55         }
  56
  57         ret = cli->servertime;
  58         if (zone) *zone = cli->serverzone;
  59
  60 done:
  61         if (cli) cli_shutdown(cli);
  62         return ret;
  63 }
  64
  65 /* find the servers time on the opt_host host */
  66 static time_t nettime(int *zone)
  67 {
  68         return cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, zone);
  69 }
  70
  71 /* return a time as a string ready to be passed to /bin/date */
  72 static char *systime(time_t t)
  73 {
  74         static fstring s;
  75         struct tm *tm;
  76
  77         tm = localtime(&t);
  78
  79         fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d",
  80                  tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  81                  tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  82         return s;
  83 }
  84
  85 int net_time_usage(int argc, const char **argv)
  86 {
  87         d_printf(
  88 "net time\n\tdisplays time on a server\n\n"\
  89 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
  90 "net time set\n\truns /bin/date with the time from the server\n\n"\
  91 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"\
  92 "\n");
  93         net_common_flags_usage(argc, argv);
  94         return -1;
  95 }
  96
  97 /* try to set the system clock using /bin/date */
  98 static int net_time_set(int argc, const char **argv)
  99 {
 100         time_t t = nettime(NULL);
 101         char *cmd;
 102         int result;
 103
 104         if (t == 0) return -1;
 105
 106         /* yes, I know this is cheesy. Use "net time system" if you want to
 107            roll your own. I'm putting this in as it works on a large number
 108            of systems and the user has a choice in whether its used or not */
 109         asprintf(&cmd, "/bin/date %s", systime(t));
 110         result = system(cmd);
 111         if (result)
 112                 d_fprintf(stderr, "%s failed.  Error was (%s)\n",
 113                         cmd, strerror(errno));
 114         free(cmd);
 115
 116         return result;
 117 }
 118
 119 /* display the time on a remote box in a format ready for /bin/date */
 120 static int net_time_system(int argc, const char **argv)
 121 {
 122         time_t t = nettime(NULL);
 123
 124         if (t == 0) return -1;
 125
 126         printf("%s\n", systime(t));
 127
 128         return 0;
 129 }
 130
 131 /* display the time on a remote box in a format ready for /bin/date */
 132 static int net_time_zone(int argc, const char **argv)
 133 {
 134         int zone = 0;
 135         int hours, mins;
 136         char zsign;
 137         time_t t;
 138
 139         t = nettime(&zone);
 140
 141         if (t == 0) return -1;
 142
 143         zsign = (zone > 0) ? '-' : '+';
 144         if (zone < 0) zone = -zone;
 145
 146         zone /= 60;
 147         hours = zone / 60;
 148         mins = zone % 60;
 149
 150         printf("%c%02d%02d\n", zsign, hours, mins);
 151
 152         return 0;
 153 }
 154
 155 /* display or set the time on a host */
 156 int net_time(int argc, const char **argv)
 157 {
 158         time_t t;
 159         struct functable func[] = {
 160                 {"SYSTEM", net_time_system},
 161                 {"SET", net_time_set},
 162                 {"ZONE", net_time_zone},
 163                 {NULL, NULL}
 164         };
 165
 166         if (!opt_host && !opt_have_ip &&
 167             !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
 168                 d_fprintf(stderr, "Could not locate a time server.  Try "\
 169                                  "specifying a target host.\n");
 170                 net_time_usage(argc,argv);
 171                 return -1;
 172         }
 173
 174         if (argc != 0) {
 175                 return net_run_function(argc, argv, func, net_time_usage);
 176         }
 177
 178         /* default - print the time */
 179         t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
 180         if (t == 0) return -1;
 181
 182         d_printf("%s", ctime(&t));
 183         return 0;
 184 }