1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California 94043
28 */
29
30/*
31 * Copyright (c) 1988 by Sun Microsystems, Inc.
32
33 */
34
35/*
36 * rtime - get time from remote machine
37 *
38 * gets time, obtaining value from host
39 * on the udp/time socket. Since timeserver returns
40 * with time of day in seconds since Jan 1, 1900, must
41 * subtract seconds before Jan 1, 1970 to get
42 * what unix uses.
43 */
44#include "namespace.h"
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48#include <errno.h>
49#include <sys/types.h>
50#include <sys/socket.h>
51#include <sys/time.h>
52#include <netinet/in.h>
53#include <stdio.h>
54#include <netdb.h>
55#include "un-namespace.h"
56
57#if defined(LIBC_SCCS) && !defined(lint)
58static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
59#endif
60#include <sys/cdefs.h>
61__FBSDID("$FreeBSD: head/lib/libc/rpc/rtime.c 92990 2002-03-22 23:18:37Z obrien $");
62
63extern int _rpc_dtablesize( void );
64
65#define NYEARS (unsigned long)(1970 - 1900)
66#define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
67
68static void do_close( int );
69
70int
71rtime(addrp, timep, timeout)
72 struct sockaddr_in *addrp;
73 struct timeval *timep;
74 struct timeval *timeout;
75{
76 int s;
77 fd_set readfds;
78 int res;
79 unsigned long thetime;
80 struct sockaddr_in from;
81 int fromlen;
82 int type;
83 struct servent *serv;
84
85 if (timeout == NULL) {
86 type = SOCK_STREAM;
87 } else {
88 type = SOCK_DGRAM;
89 }
90 s = _socket(AF_INET, type, 0);
91 if (s < 0) {
92 return(-1);
93 }
94 addrp->sin_family = AF_INET;
95
96 /* TCP and UDP port are the same in this case */
97 if ((serv = getservbyname("time", "tcp")) == NULL) {
98 return(-1);
99 }
100
101 addrp->sin_port = serv->s_port;
102
103 if (type == SOCK_DGRAM) {
104 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
105 (struct sockaddr *)addrp, sizeof(*addrp));
106 if (res < 0) {
107 do_close(s);
108 return(-1);
109 }
110 do {
111 FD_ZERO(&readfds);
112 FD_SET(s, &readfds);
113 res = _select(_rpc_dtablesize(), &readfds,
114 (fd_set *)NULL, (fd_set *)NULL, timeout);
115 } while (res < 0 && errno == EINTR);
116 if (res <= 0) {
117 if (res == 0) {
118 errno = ETIMEDOUT;
119 }
120 do_close(s);
121 return(-1);
122 }
123 fromlen = sizeof(from);
124 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
125 (struct sockaddr *)&from, &fromlen);
126 do_close(s);
127 if (res < 0) {
128 return(-1);
129 }
130 } else {
131 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
132 do_close(s);
133 return(-1);
134 }
135 res = _read(s, (char *)&thetime, sizeof(thetime));
136 do_close(s);
137 if (res < 0) {
138 return(-1);
139 }
140 }
141 if (res != sizeof(thetime)) {
142 errno = EIO;
143 return(-1);
144 }
145 thetime = ntohl(thetime);
146 timep->tv_sec = thetime - TOFFSET;
147 timep->tv_usec = 0;
148 return(0);
149}
150
151static void
152do_close(s)
153 int s;
154{
155 int save;
156
157 save = errno;
158 (void)_close(s);
159 errno = save;
160}