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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License, Version 1.0 only
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6 * (the "License"). You may not use this file except in compliance
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7 * with the License.
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8 *
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9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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10 * or http://www.opensolaris.org/os/licensing.
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11 * See the License for the specific language governing permissions
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12 * and limitations under the License.
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13 *
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14 * When distributing Covered Code, include this CDDL HEADER in each
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15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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16 * If applicable, add the following below this CDDL HEADER, with the
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17 * fields enclosed by brackets "[]" replaced with your own identifying
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18 * information: Portions Copyright [yyyy] [name of copyright owner]
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19 *
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20 * CDDL HEADER END
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21 */
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22 /*
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23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
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28 /* All Rights Reserved */
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29
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30 /*
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31 * University Copyright- Copyright (c) 1982, 1986, 1988
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32 * The Regents of the University of California
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33 * All Rights Reserved
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34 *
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35 * University Acknowledgment- Portions of this document are derived from
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36 * software developed by the University of California, Berkeley, and its
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37 * contributors.
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38 */
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39
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40 #pragma ident "@(#)rdate.c 1.14 05/06/08 SMI"
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41
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42 /*
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43 * rdate - get date from remote machine
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44 *
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45 * sets time, obtaining value from host
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46 * on the tcp/time socket.
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47 */
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48
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49 #include <signal.h>
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50 #include <sys/types.h>
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51 #include <sys/time.h>
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52 #include <sys/socket.h>
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53 #include <netinet/tcp.h>
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54 #include <strings.h>
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55 #include <unistd.h>
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56 #include <stdlib.h>
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57 #include <netdb.h>
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58 #include <stdio.h>
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59
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60 /*
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61 * The timeserver returns with time of day in seconds since
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62 * Jan 1, 1900. We must subtract 86400(365*70 + 17) to get time
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63 * since Jan 1, 1970, which is what get/settimeofday uses.
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64 */
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65
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66 #define TOFFSET ((unsigned int)86400*(365*70 + 17))
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67
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68 /*
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69 * Before setting the system time, the value returned by the
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70 * timeserver is checked for plausibility. If the returned date
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71 * is before the time this program was written it cannot be
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72 * correct.
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73 */
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74
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75 #define WRITTEN 440199955 /* 22:45:55 13/Dec/1983 */
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76 #define SECONDS_TO_MS 1000
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77
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78 static void timeout(int);
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79
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80 int
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81 main(int argc, char **argv)
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82 {
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83 int s, i;
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84 uint32_t time;
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85 struct timeval timestruct;
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86 unsigned int connect_timeout;
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87 /* number of seconds to wait for something to happen. */
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88 unsigned int rdate_timeout = 30; /* seconds */
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89 struct addrinfo hints;
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90 struct addrinfo *res;
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91 int rc;
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92
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93 if (argc != 2) {
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94 (void) fputs("usage: rdate host\n", stderr);
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95 exit(EXIT_FAILURE);
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96 }
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97
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98 (void) memset(&hints, 0, sizeof (hints));
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99 hints.ai_protocol = IPPROTO_TCP;
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100 res = NULL;
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101
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102 /*
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103 * getaddrinfo() may take a long time, because it can involve
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104 * NIS, DNS, or LDAP lookups. Set an alarm timer. Note that this
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105 * may still fail, depending on how SIGALRM is handled by the
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106 * functions invoked by getaddrinfo().
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107 */
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108
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109 (void) signal(SIGALRM, timeout);
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110 (void) alarm(rdate_timeout);
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111
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112 /*
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113 * Note: memory not freed due to short lifetime of program.
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114 */
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115
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116 rc = getaddrinfo(argv[1], "time", &hints, &res);
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117 (void) alarm(0);
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118
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119 if (rc != 0) {
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120 (void) fprintf(stderr, "Host name %s not found: %s\n", argv[1],
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121 gai_strerror(rc));
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122 exit(EXIT_FAILURE);
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123 }
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124
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125 connect_timeout = rdate_timeout * SECONDS_TO_MS;
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126 for (; res != NULL; res = res->ai_next) {
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127 s = socket(res->ai_addr->sa_family, res->ai_socktype,
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128 res->ai_protocol);
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129 if (s < 0) {
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130 perror("rdate: socket");
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131 exit(EXIT_FAILURE);
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132 }
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133
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134 if (setsockopt(s, IPPROTO_TCP, TCP_CONN_ABORT_THRESHOLD,
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135 (char *)&connect_timeout, sizeof (connect_timeout)) == -1) {
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136 perror("setsockopt TCP_CONN_ABORT_THRESHOLD");
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137 }
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138
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139 if (connect(s, res->ai_addr, res->ai_addrlen) >= 0)
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140 break;
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141
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142 if (res->ai_next == NULL) {
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143 perror("rdate: connect");
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144 (void) close(s);
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145 exit(EXIT_FAILURE);
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146 }
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147
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148 (void) close(s);
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149 }
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150
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151 (void) alarm(rdate_timeout);
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152 if (read(s, (char *)&time, sizeof (time)) != sizeof (time)) {
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153 perror("rdate: read");
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154 exit(EXIT_FAILURE);
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155 }
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156 (void) alarm(0);
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157
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158 time = ntohl(time) - TOFFSET;
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159 /* date must be later than when program was written */
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160 if (time < WRITTEN) {
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161 (void) fprintf(stderr, "didn't get plausible time from %s\n",
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162 argv[1]);
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163 exit(EXIT_FAILURE);
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164 }
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165 timestruct.tv_usec = 0;
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166 timestruct.tv_sec = time;
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167 i = settimeofday(×truct, 0);
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168 if (i == -1) {
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169 perror("couldn't set time of day");
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170 exit(EXIT_FAILURE);
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171 } else {
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172 (void) printf("%s", ctime(×truct.tv_sec));
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173 #if defined(i386)
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174 (void) system("/usr/sbin/rtc -c > /dev/null 2>&1");
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175 #endif
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176 }
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177 return (EXIT_SUCCESS);
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178 }
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179
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180 /*ARGSUSED*/
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181 static void
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182 timeout(int sig)
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183 {
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184 (void) fputs("couldn't contact time server\n", stderr);
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185 exit(EXIT_FAILURE);
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186 /* NOTREACHED */
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187 }
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