| 1 | /* rdate 1.0 - Set time&date from remote host Author: Kees J. Bot
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| 2 | * 12 Oct 1995
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| 3 | */
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| 4 | #define nil 0
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| 5 | #include <sys/types.h>
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| 6 | #include <stdio.h>
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| 7 | #include <time.h>
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| 8 | #include <string.h>
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| 9 | #include <fcntl.h>
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| 10 | #include <errno.h>
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| 11 | #include <stdlib.h>
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| 12 | #include <unistd.h>
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| 13 | #include <sys/ioctl.h>
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| 14 | #include <net/hton.h>
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| 15 | #include <net/netlib.h>
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| 16 | #include <net/gen/in.h>
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| 17 | #include <net/gen/netdb.h>
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| 18 | #include <net/gen/tcp.h>
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| 19 | #include <net/gen/tcp_io.h>
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| 20 |
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| 21 | void report(const char *label)
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| 22 | {
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| 23 | fprintf(stderr, "rdate: %s: %s\n", label, strerror(errno));
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| 24 | }
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| 25 |
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| 26 | void fatal(const char *label)
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| 27 | {
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| 28 | report(label);
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| 29 | exit(1);
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| 30 | }
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| 31 |
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| 32 | int main(int argc, char **argv)
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| 33 | {
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| 34 | char *tcp_device;
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| 35 | int fd;
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| 36 | int i;
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| 37 | struct servent *servent;
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| 38 | struct hostent *hostent;
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| 39 | u16_t time_port;
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| 40 | nwio_tcpconf_t tcpconf;
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| 41 | nwio_tcpcl_t tcpcl;
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| 42 | u32_t net_time;
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| 43 | time_t unix_time;
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| 44 |
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| 45 | if (argc <= 1) {
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| 46 | fprintf(stderr, "Usage: rdate host ...\n");
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| 47 | exit(1);
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| 48 | }
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| 49 |
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| 50 | /* Look up the port number of the TCP service "time". */
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| 51 | if ((servent= getservbyname("time", "tcp")) == nil) {
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| 52 | fprintf(stderr, "rdate: \"time\": unknown service\n");
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| 53 | exit(1);
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| 54 | }
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| 55 | time_port= servent->s_port;
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| 56 |
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| 57 | if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= TCP_DEVICE;
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| 58 |
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| 59 | if ((fd= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
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| 60 |
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| 61 | /* Try each host on the command line. */
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| 62 | for (i= 1; i < argc; i++) {
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| 63 | if ((hostent= gethostbyname(argv[i])) == nil) {
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| 64 | fprintf(stderr, "rdate: %s: unknown host\n", argv[i]);
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| 65 | continue;
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| 66 | }
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| 67 |
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| 68 | /* Configure a TCP channel and connect to the remote host. */
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| 69 |
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| 70 | tcpconf.nwtc_flags= NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP;
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| 71 | memcpy(&tcpconf.nwtc_remaddr, hostent->h_addr, 4);
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| 72 | tcpconf.nwtc_remport= time_port;
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| 73 | if (ioctl(fd, NWIOSTCPCONF, &tcpconf) == -1) fatal(tcp_device);
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| 74 |
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| 75 | tcpcl.nwtcl_flags= 0;
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| 76 | if (ioctl(fd, NWIOTCPCONN, &tcpcl) < 0) {
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| 77 | report(argv[i]);
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| 78 | continue;
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| 79 | }
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| 80 |
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| 81 | /* Read four bytes to obtain the time. */
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| 82 | switch (read(fd, &net_time, sizeof(net_time))) {
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| 83 | case -1:
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| 84 | report(argv[i]);
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| 85 | continue;
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| 86 | default:
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| 87 | fprintf(stderr, "rdate: %s: short read\n", argv[i]);
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| 88 | continue;
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| 89 | case sizeof(net_time):
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| 90 | break;
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| 91 | }
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| 92 | break;
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| 93 | }
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| 94 | if (i == argc) exit(1);
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| 95 |
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| 96 | /* Internet time is in seconds since 1900, UNIX time is in seconds
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| 97 | * since 1970.
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| 98 | */
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| 99 | unix_time= ntohl(net_time) - 2208988800;
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| 100 |
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| 101 | /* Try to set the time and tell us about it. */
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| 102 | if (stime(&unix_time) < 0) {
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| 103 | printf("time on ");
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| 104 | } else {
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| 105 | printf("time set to ");
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| 106 | }
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| 107 | printf("%s: %s", argv[i], ctime(&unix_time));
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| 108 | exit(0);
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| 109 | }
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