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 #include <sys/cdefs.h> 62 extern int _rpc_dtablesize( void ); 63 64 #define NYEARS (unsigned long)(1970 - 1900) 65 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4))) 66 67 static void do_close( int ); 68 69 int 70 rtime(struct sockaddr_in *addrp, struct timeval *timep, 71 struct timeval *timeout) 72 { 73 int s; 74 fd_set readfds; 75 int res; 76 unsigned long thetime; 77 struct sockaddr_in from; 78 socklen_t fromlen; 79 int type; 80 struct servent *serv; 81 82 if (timeout == NULL) { 83 type = SOCK_STREAM; 84 } else { 85 type = SOCK_DGRAM; 86 } 87 s = _socket(AF_INET, type, 0); 88 if (s < 0) { 89 return(-1); 90 } 91 addrp->sin_family = AF_INET; 92 93 /* TCP and UDP port are the same in this case */ 94 if ((serv = getservbyname("time", "tcp")) == NULL) { 95 return(-1); 96 } 97 98 addrp->sin_port = serv->s_port; 99 100 if (type == SOCK_DGRAM) { 101 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0, 102 (struct sockaddr *)addrp, sizeof(*addrp)); 103 if (res < 0) { 104 do_close(s); 105 return(-1); 106 } 107 do { 108 FD_ZERO(&readfds); 109 FD_SET(s, &readfds); 110 res = _select(_rpc_dtablesize(), &readfds, 111 (fd_set *)NULL, (fd_set *)NULL, timeout); 112 } while (res < 0 && errno == EINTR); 113 if (res <= 0) { 114 if (res == 0) { 115 errno = ETIMEDOUT; 116 } 117 do_close(s); 118 return(-1); 119 } 120 fromlen = sizeof(from); 121 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0, 122 (struct sockaddr *)&from, &fromlen); 123 do_close(s); 124 if (res < 0) { 125 return(-1); 126 } 127 } else { 128 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) { 129 do_close(s); 130 return(-1); 131 } 132 res = _read(s, (char *)&thetime, sizeof(thetime)); 133 do_close(s); 134 if (res < 0) { 135 return(-1); 136 } 137 } 138 if (res != sizeof(thetime)) { 139 errno = EIO; 140 return(-1); 141 } 142 thetime = ntohl(thetime); 143 timep->tv_sec = thetime - TOFFSET; 144 timep->tv_usec = 0; 145 return(0); 146 } 147 148 static void 149 do_close(int s) 150 { 151 int save; 152 153 save = errno; 154 (void)_close(s); 155 errno = save; 156 } 157