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         extern pstring global_myname;
  32         struct cli_state *cli = NULL;
  33
  34         cli = cli_initialise(NULL);
  35         if (!cli) goto done;
  36
  37         if (!cli_connect(cli, host, ip)) {
  38                 fprintf(stderr,"Can't contact server\n");
  39                 goto done;
  40         }
  41
  42         make_nmb_name(&calling, global_myname, 0x0);
  43         if (host) {
  44                 make_nmb_name(&called, host, 0x20);
  45         } else {
  46                 make_nmb_name(&called, "*SMBSERVER", 0x20);
  47         }
  48
  49         if (!cli_session_request(cli, &calling, &called)) {
  50                 fprintf(stderr,"Session request failed\n");
  51                 goto done;
  52         }
  53         if (!cli_negprot(cli)) {
  54                 fprintf(stderr,"Protocol negotiation failed\n");
  55                 goto done;
  56         }
  57
  58         ret = cli->servertime;
  59         if (zone) *zone = cli->serverzone;
  60
  61 done:
  62         if (cli) cli_shutdown(cli);
  63         return ret;
  64 }
  65
  66 /* find the servers time on the opt_host host */
  67 static time_t nettime(int *zone)
  68 {
  69         extern BOOL opt_have_ip;
  70         extern struct in_addr opt_dest_ip;
  71         extern char *opt_host;
  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 char *systime(time_t t)
  77 {
  78         static char s[100];
  79         struct tm *tm;
  80
  81         tm = localtime(&t);
  82
  83         snprintf(s, sizeof(s), "%02d%02d%02d%02d%04d.%02d",
  84                  tm->tm_mon+1, tm->tm_mday, tm->tm_hour,
  85                  tm->tm_min, tm->tm_year + 1900, tm->tm_sec);
  86         return s;
  87 }
  88
  89 int net_time_usage(int argc, const char **argv)
  90 {
  91         d_printf(
  92 "net time\n\tdisplays time on a server\n\n"\
  93 "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n"\
  94 "net time set\n\truns /bin/date with the time from the server\n\n"\
  95 "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n"\
  96 "\n");
  97         net_common_flags_usage(argc, argv);
  98         return -1;
  99 }
 100
 101 /* try to set the system clock using /bin/date */
 102 static int net_time_set(int argc, const char **argv)
 103 {
 104         time_t t = nettime(NULL);
 105         char *cmd;
 106
 107         if (t == 0) return -1;
 108
 109         /* yes, I know this is cheesy. Use "net time system" if you want to
 110            roll your own. I'm putting this in as it works on a large number
 111            of systems and the user has a choice in whether its used or not */
 112         asprintf(&cmd, "/bin/date %s", systime(t));
 113         system(cmd);
 114         free(cmd);
 115
 116         return 0;
 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         extern BOOL opt_have_ip;
 160         extern struct in_addr opt_dest_ip;
 161         extern char *opt_host;
 162         struct functable func[] = {
 163                 {"SYSTEM", net_time_system},
 164                 {"SET", net_time_set},
 165                 {"ZONE", net_time_zone},
 166                 {NULL, NULL}
 167         };
 168
 169         if (!opt_host && !opt_have_ip &&
 170             !find_master_ip(opt_target_workgroup, &opt_dest_ip)) {
 171                 d_printf("Could not locate a time server.  Try "\
 172                                  "specifying a target host.\n");
 173                 net_time_usage(argc,argv);
 174                 return -1;
 175         }
 176
 177         if (argc != 0) {
 178                 return net_run_function(argc, argv, func, net_time_usage);
 179         }
 180
 181         /* default - print the time */
 182         t = cli_servertime(opt_host, opt_have_ip? &opt_dest_ip : NULL, NULL);
 183         if (t == 0) return -1;
 184
 185         d_printf("%s", ctime(&t));
 186         return 0;
 187 }