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();
  34         if (!cli) {
  35                 goto done;
  36         }
  37
  38         if (!cli_connect(cli, host, ip)) {
  39                 fprintf(stderr,"Can't contact server\n");
  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(int *zone)
  71 {
  72         return cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, zone);
  73 }
  74
  75 /* return a time as a string ready to be passed to /bin/date */
  76 static const char *systime(time_t t)
  77 {
  78         static fstring s;
  79         struct tm *tm;
  80
  81         tm = localtime(&t);
  82         if (!tm) {
  83                 return "unknown";
  84         }
  85
  86         fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d",
  87                  tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  88                  tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  89         return s;
  90 }
  91
  92 int net_time_usage(int argc, const char **argv)
  93 {
  94         d_printf(
  95 "net time\n\tdisplays time on a server\n\n"\
  96 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
  97 "net time set\n\truns /bin/date with the time from the server\n\n"\
  98 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"\
  99 "\n");
 100         net_common_flags_usage(argc, argv);
 101         return -1;
 102 }
 103
 104 /* try to set the system clock using /bin/date */
 105 static int net_time_set(int argc, const char **argv)
 106 {
 107         time_t t = nettime(NULL);
 108         char *cmd;
 109         int result;
 110
 111         if (t == 0) return -1;
 112
 113         /* yes, I know this is cheesy. Use "net time system" if you want to
 114            roll your own. I'm putting this in as it works on a large number
 115            of systems and the user has a choice in whether its used or not */
 116         asprintf(&cmd, "/bin/date %s", systime(t));
 117         result = system(cmd);
 118         if (result)
 119                 d_fprintf(stderr, "%s failed.  Error was (%s)\n",
 120                         cmd, strerror(errno));
 121         free(cmd);
 122
 123         return result;
 124 }
 125
 126 /* display the time on a remote box in a format ready for /bin/date */
 127 static int net_time_system(int argc, const char **argv)
 128 {
 129         time_t t = nettime(NULL);
 130
 131         if (t == 0) return -1;
 132
 133         printf("%s\n", systime(t));
 134
 135         return 0;
 136 }
 137
 138 /* display the time on a remote box in a format ready for /bin/date */
 139 static int net_time_zone(int argc, const char **argv)
 140 {
 141         int zone = 0;
 142         int hours, mins;
 143         char zsign;
 144         time_t t;
 145
 146         t = nettime(&zone);
 147
 148         if (t == 0) return -1;
 149
 150         zsign = (zone > 0) ? '-' : '+';
 151         if (zone < 0) zone = -zone;
 152
 153         zone /= 60;
 154         hours = zone / 60;
 155         mins = zone % 60;
 156
 157         printf("%c%02d%02d\n", zsign, hours, mins);
 158
 159         return 0;
 160 }
 161
 162 /* display or set the time on a host */
 163 int net_time(int argc, const char **argv)
 164 {
 165         time_t t;
 166         struct functable func[] = {
 167                 {"SYSTEM", net_time_system},
 168                 {"SET", net_time_set},
 169                 {"ZONE", net_time_zone},
 170                 {NULL, NULL}
 171         };
 172
 173         if (!opt_host && !opt_have_ip &&
 174             !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
 175                 d_fprintf(stderr, "Could not locate a time server.  Try "\
 176                                  "specifying a target host.\n");
 177                 net_time_usage(argc,argv);
 178                 return -1;
 179         }
 180
 181         if (argc != 0) {
 182                 return net_run_function(argc, argv, func, net_time_usage);
 183         }
 184
 185         /* default - print the time */
 186         t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
 187         if (t == 0) return -1;
 188
 189         d_printf("%s", ctime(&t));
 190         return 0;
 191 }