/* Samba Unix/Linux SMB client library net time command Copyright (C) 2001 Andrew Tridgell (tridge@samba.org) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "utils/net.h" /* return the time on a server. This does not require any authentication */ static time_t cli_servertime(const char *host, struct sockaddr_storage *pss, int *zone) { struct nmb_name calling, called; time_t ret = 0; struct cli_state *cli = NULL; NTSTATUS status; cli = cli_initialise(); if (!cli) { goto done; } status = cli_connect(cli, host, pss); if (!NT_STATUS_IS_OK(status)) { fprintf(stderr,"Can't contact server %s. Error %s\n", host, nt_errstr(status)); goto done; } make_nmb_name(&calling, global_myname(), 0x0); if (host) { make_nmb_name(&called, host, 0x20); } else { make_nmb_name(&called, "*SMBSERVER", 0x20); } if (!cli_session_request(cli, &calling, &called)) { fprintf(stderr,"Session request failed\n"); goto done; } status = cli_negprot(cli); if (!NT_STATUS_IS_OK(status)) { fprintf(stderr, "Protocol negotiation failed: %s\n", nt_errstr(status)); goto done; } ret = cli->servertime; if (zone) *zone = cli->serverzone; done: if (cli) { cli_shutdown(cli); } return ret; } /* find the servers time on the opt_host host */ static time_t nettime(struct net_context *c, int *zone) { return cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL, zone); } /* return a time as a string ready to be passed to /bin/date */ static const char *systime(time_t t) { static fstring s; struct tm *tm; tm = localtime(&t); if (!tm) { return "unknown"; } fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d", tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_year + 1900, tm->tm_sec); return s; } int net_time_usage(struct net_context *c, int argc, const char **argv) { d_printf( "net time\n\tdisplays time on a server\n\n" "net time system\n\tdisplays time on a server in a format ready for /bin/date\n\n" "net time set\n\truns /bin/date with the time from the server\n\n" "net time zone\n\tdisplays the timezone in hours from GMT on the remote computer\n\n" "\n"); net_common_flags_usage(c, argc, argv); return -1; } /* try to set the system clock using /bin/date */ static int net_time_set(struct net_context *c, int argc, const char **argv) { time_t t = nettime(c, NULL); char *cmd; int result; if (t == 0) return -1; /* yes, I know this is cheesy. Use "net time system" if you want to roll your own. I'm putting this in as it works on a large number of systems and the user has a choice in whether its used or not */ if (asprintf(&cmd, "/bin/date %s", systime(t)) == -1) { return -1; } result = system(cmd); if (result) d_fprintf(stderr, "%s failed. Error was (%s)\n", cmd, strerror(errno)); free(cmd); return result; } /* display the time on a remote box in a format ready for /bin/date */ static int net_time_system(struct net_context *c, int argc, const char **argv) { time_t t; if (c->display_usage) { d_printf("Usage:\n" "net time system\n" " Output remote time server time in a format ready " "for /bin/date\n"); return 0; } t = nettime(c, NULL); if (t == 0) return -1; printf("%s\n", systime(t)); return 0; } /* display the remote time server's offset to UTC */ static int net_time_zone(struct net_context *c, int argc, const char **argv) { int zone = 0; int hours, mins; char zsign; time_t t; if (c->display_usage) { d_printf("Usage:\n" "net time zone\n" " Display the remote time server's offset to UTC\n"); return 0; } t = nettime(c, &zone); if (t == 0) return -1; zsign = (zone > 0) ? '-' : '+'; if (zone < 0) zone = -zone; zone /= 60; hours = zone / 60; mins = zone % 60; printf("%c%02d%02d\n", zsign, hours, mins); return 0; } /* display or set the time on a host */ int net_time(struct net_context *c, int argc, const char **argv) { time_t t; struct functable func[] = { { "system", net_time_system, NET_TRANSPORT_LOCAL, "Display time ready for /bin/date", "net time system\n" " Display time ready for /bin/date" }, { "set", net_time_set, NET_TRANSPORT_LOCAL, "Set the system time from time server", "net time set\n" " Set the system time from time server" }, { "zone", net_time_zone, NET_TRANSPORT_LOCAL, "Display timezone offset from UTC", "net time zone\n" " Display timezone offset from UTC" }, {NULL, NULL, 0, NULL, NULL} }; if (argc != 0) { return net_run_function(c, argc, argv, "net time", func); } if (c->display_usage) { d_printf("Usage:\n"); d_printf("net time\n" " Display the remote time server's time\n"); net_display_usage_from_functable(func); return 0; } if (!c->opt_host && !c->opt_have_ip && !find_master_ip(c->opt_target_workgroup, &c->opt_dest_ip)) { d_fprintf(stderr, "Could not locate a time server. Try " "specifying a target host.\n"); net_time_usage(c, argc,argv); return -1; } /* default - print the time */ t = cli_servertime(c->opt_host, c->opt_have_ip? &c->opt_dest_ip : NULL, NULL); if (t == 0) return -1; d_printf("%s", ctime(&t)); return 0; }