1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 * Copyright (c) 1988 by Sun Microsystems, Inc.
33
34 */
35
36 /*
37 * rtime - get time from remote machine
38 *
39 * gets time, obtaining value from host
40 * on the udp/time socket. Since timeserver returns
41 * with time of day in seconds since Jan 1, 1900, must
42 * subtract seconds before Jan 1, 1970 to get
43 * what unix uses.
44 */
45 #include "namespace.h"
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49 #include <errno.h>
50 #include <sys/types.h>
51 #include <sys/socket.h>
52 #include <sys/time.h>
53 #include <netinet/in.h>
54 #include <stdio.h>
55 #include <netdb.h>
56 #include "un-namespace.h"
57
58 #if defined(LIBC_SCCS) && !defined(lint)
59 static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
60 #endif
61 extern int _rpc_dtablesize( void );
62
63 #define NYEARS (unsigned long)(1970 - 1900)
64 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
65
66 static void do_close( int );
67
68 int
rtime(struct sockaddr_in * addrp,struct timeval * timep,struct timeval * timeout)69 rtime(struct sockaddr_in *addrp, struct timeval *timep,
70 struct timeval *timeout)
71 {
72 int s;
73 fd_set readfds;
74 int res;
75 unsigned long thetime;
76 struct sockaddr_in from;
77 socklen_t fromlen;
78 int type;
79 struct servent *serv;
80
81 if (timeout == NULL) {
82 type = SOCK_STREAM;
83 } else {
84 type = SOCK_DGRAM;
85 }
86 s = _socket(AF_INET, type, 0);
87 if (s < 0) {
88 return(-1);
89 }
90 addrp->sin_family = AF_INET;
91
92 /* TCP and UDP port are the same in this case */
93 if ((serv = getservbyname("time", "tcp")) == NULL) {
94 return(-1);
95 }
96
97 addrp->sin_port = serv->s_port;
98
99 if (type == SOCK_DGRAM) {
100 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
101 (struct sockaddr *)addrp, sizeof(*addrp));
102 if (res < 0) {
103 do_close(s);
104 return(-1);
105 }
106 do {
107 FD_ZERO(&readfds);
108 FD_SET(s, &readfds);
109 res = _select(_rpc_dtablesize(), &readfds,
110 (fd_set *)NULL, (fd_set *)NULL, timeout);
111 } while (res < 0 && errno == EINTR);
112 if (res <= 0) {
113 if (res == 0) {
114 errno = ETIMEDOUT;
115 }
116 do_close(s);
117 return(-1);
118 }
119 fromlen = sizeof(from);
120 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
121 (struct sockaddr *)&from, &fromlen);
122 do_close(s);
123 if (res < 0) {
124 return(-1);
125 }
126 } else {
127 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
128 do_close(s);
129 return(-1);
130 }
131 res = _read(s, (char *)&thetime, sizeof(thetime));
132 do_close(s);
133 if (res < 0) {
134 return(-1);
135 }
136 }
137 if (res != sizeof(thetime)) {
138 errno = EIO;
139 return(-1);
140 }
141 thetime = ntohl(thetime);
142 timep->tv_sec = thetime - TOFFSET;
143 timep->tv_usec = 0;
144 return(0);
145 }
146
147 static void
do_close(int s)148 do_close(int s)
149 {
150 int save;
151
152 save = errno;
153 (void)_close(s);
154 errno = save;
155 }
156