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 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 148 do_close(int s) 149 { 150 int save; 151 152 save = errno; 153 (void)_close(s); 154 errno = save; 155 } 156