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54e9585e10
function old new delta rdate_main 246 251 +5 show_entry 291 287 -4 daytime_stream 44 39 -5 packed_usage 30176 30168 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/3 up/down: 5/-17) Total: -12 bytes text data bss dec hex filename 929453 932 17684 948069 e7765 busybox_old 929411 932 17684 948027 e773b busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* The Rdate command will ask a time server for the RFC 868 time
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* and optionally set the system time.
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*
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* by Sterling Huxley <sterling@europa.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//usage:#define rdate_trivial_usage
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//usage: "[-sp] HOST"
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//usage:#define rdate_full_usage "\n\n"
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//usage: "Get and possibly set system time from a remote HOST\n"
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//usage: "\n -s Set system time (default)"
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//usage: "\n -p Print time"
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#include "libbb.h"
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enum { RFC_868_BIAS = 2208988800UL };
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static void socket_timeout(int sig UNUSED_PARAM)
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{
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bb_error_msg_and_die("timeout connecting to time server");
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}
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static time_t askremotedate(const char *host)
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{
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uint32_t nett;
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int fd;
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/* Add a timeout for dead or inaccessible servers */
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alarm(10);
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signal(SIGALRM, socket_timeout);
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fd = create_and_connect_stream_or_die(host, bb_lookup_port("time", "tcp", 37));
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if (safe_read(fd, &nett, 4) != 4) /* read time from server */
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bb_error_msg_and_die("%s: %s", host, "short read");
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if (ENABLE_FEATURE_CLEAN_UP)
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close(fd);
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/* Convert from network byte order to local byte order.
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* RFC 868 time is the number of seconds
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* since 00:00 (midnight) 1 January 1900 GMT
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* the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
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* Subtract the RFC 868 time to get Linux epoch.
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*/
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return ntohl(nett) - RFC_868_BIAS;
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}
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int rdate_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int rdate_main(int argc UNUSED_PARAM, char **argv)
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{
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time_t remote_time;
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unsigned flags;
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opt_complementary = "-1";
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flags = getopt32(argv, "sp");
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remote_time = askremotedate(argv[optind]);
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if (!(flags & 2)) { /* no -p (-s may be present) */
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time_t current_time;
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time(¤t_time);
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if (current_time == remote_time)
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bb_error_msg("current time matches remote time");
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else
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if (stime(&remote_time) < 0)
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bb_perror_msg_and_die("can't set time of day");
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}
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if (flags != 1) /* not lone -s */
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printf("%s", ctime(&remote_time));
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return EXIT_SUCCESS;
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}
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