109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/* rdate 1.0 - Set time&date from remote host Author: Kees J. Bot
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* 12 Oct 1995
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*/
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#define nil 0
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#include <sys/types.h>
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#include <stdio.h>
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#include <time.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <net/hton.h>
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#include <net/netlib.h>
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#include <net/gen/in.h>
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#include <net/gen/netdb.h>
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#include <net/gen/tcp.h>
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#include <net/gen/tcp_io.h>
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void report(const char *label)
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{
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fprintf(stderr, "rdate: %s: %s\n", label, strerror(errno));
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}
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void fatal(const char *label)
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{
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report(label);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char *tcp_device;
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int fd;
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int i;
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struct servent *servent;
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struct hostent *hostent;
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u16_t time_port;
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nwio_tcpconf_t tcpconf;
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nwio_tcpcl_t tcpcl;
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u32_t net_time;
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time_t unix_time;
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if (argc <= 1) {
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fprintf(stderr, "Usage: rdate host ...\n");
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exit(1);
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}
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/* Look up the port number of the TCP service "time". */
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if ((servent= getservbyname("time", "tcp")) == nil) {
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fprintf(stderr, "rdate: \"time\": unknown service\n");
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exit(1);
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}
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time_port= servent->s_port;
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if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= TCP_DEVICE;
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if ((fd= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
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/* Try each host on the command line. */
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for (i= 1; i < argc; i++) {
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if ((hostent= gethostbyname(argv[i])) == nil) {
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fprintf(stderr, "rdate: %s: unknown host\n", argv[i]);
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continue;
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}
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/* Configure a TCP channel and connect to the remote host. */
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tcpconf.nwtc_flags= NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP;
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memcpy(&tcpconf.nwtc_remaddr, hostent->h_addr, 4);
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tcpconf.nwtc_remport= time_port;
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if (ioctl(fd, NWIOSTCPCONF, &tcpconf) == -1) fatal(tcp_device);
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tcpcl.nwtcl_flags= 0;
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if (ioctl(fd, NWIOTCPCONN, &tcpcl) < 0) {
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report(argv[i]);
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continue;
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}
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/* Read four bytes to obtain the time. */
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switch (read(fd, &net_time, sizeof(net_time))) {
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case -1:
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report(argv[i]);
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continue;
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default:
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fprintf(stderr, "rdate: %s: short read\n", argv[i]);
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continue;
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case sizeof(net_time):
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break;
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}
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break;
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}
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if (i == argc) exit(1);
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/* Internet time is in seconds since 1900, UNIX time is in seconds
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* since 1970.
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*/
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unix_time= ntohl(net_time) - 2208988800;
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/* Try to set the time and tell us about it. */
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if (stime(&unix_time) < 0) {
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printf("time on ");
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} else {
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printf("time set to ");
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}
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printf("%s: %s", argv[i], ctime(&unix_time));
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exit(0);
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}
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