1 /* $OpenBSD: rdate.c,v 1.37 2023/01/04 13:00:11 jsg Exp $ */ 2 /* $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Christos Zoulas 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * rdate.c: Set the date from the specified host 31 * 32 * Time is returned as the number of seconds since 33 * midnight January 1st 1900. 34 */ 35 36 #include <sys/socket.h> 37 #include <sys/time.h> 38 #include <sys/wait.h> 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <ctype.h> 43 #include <err.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <time.h> 47 48 /* there are systems without libutil; for portability */ 49 #ifndef NO_UTIL 50 #include <util.h> 51 #else 52 #define logwtmp(a,b,c) 53 #endif 54 55 void rfc868time_client(const char *, int, struct timeval *, struct timeval *, int); 56 void ntp_client(const char *, int, struct timeval *, struct timeval *, int); 57 58 extern char *__progname; 59 __dead void usage(void); 60 61 struct { 62 char message[2048]; 63 struct timeval new; 64 struct timeval adjust; 65 } pdata; 66 67 __dead void 68 usage(void) 69 { 70 (void) fprintf(stderr, "usage: %s [-46acnopsv] host\n", __progname); 71 exit(1); 72 } 73 74 int 75 main(int argc, char **argv) 76 { 77 int pr = 0, silent = 0, ntp = 1, verbose = 0; 78 int slidetime = 0, corrleaps = 0; 79 char *hname; 80 int c, p[2], pid; 81 int family = PF_UNSPEC; 82 83 while ((c = getopt(argc, argv, "46psanocv")) != -1) { 84 switch (c) { 85 case '4': 86 family = PF_INET; 87 break; 88 89 case '6': 90 family = PF_INET6; 91 break; 92 93 case 'p': 94 pr = 1; 95 break; 96 97 case 's': 98 silent = 1; 99 break; 100 101 case 'a': 102 slidetime = 1; 103 break; 104 105 case 'n': 106 ntp = 1; 107 break; 108 109 case 'o': 110 ntp = 0; 111 break; 112 113 case 'c': 114 corrleaps = 1; 115 break; 116 117 case 'v': 118 verbose = 1; 119 break; 120 121 default: 122 usage(); 123 } 124 } 125 if (argc - 1 != optind) 126 usage(); 127 hname = argv[optind]; 128 129 /* 130 * Privilege separation increases safety, with a slight reduction 131 * in precision because the time values have to return over a pipe. 132 */ 133 if (pipe(p) == -1) 134 err(1, "pipe"); 135 switch ((pid = fork())) { 136 case -1: 137 err(1, "fork"); 138 break; 139 case 0: 140 if (pledge("stdio inet dns", NULL) == -1) 141 err(1, "pledge"); 142 143 close(p[0]); /* read side of pipe */ 144 dup2(p[1], STDIN_FILENO); 145 if (p[1] != STDIN_FILENO) 146 close(p[1]); 147 dup2(STDIN_FILENO, STDOUT_FILENO); 148 dup2(STDOUT_FILENO, STDERR_FILENO); 149 setvbuf(stdout, NULL, _IOFBF, 0); 150 setvbuf(stderr, NULL, _IOFBF, 0); 151 152 if (ntp) 153 ntp_client(hname, family, &pdata.new, 154 &pdata.adjust, corrleaps); 155 else 156 rfc868time_client(hname, family, &pdata.new, 157 &pdata.adjust, corrleaps); 158 159 if (write(STDOUT_FILENO, &pdata, sizeof pdata) != sizeof pdata) 160 exit(1); 161 exit(0); 162 } 163 164 if (pledge("stdio rpath wpath settime", NULL) == -1) 165 err(1, "pledge"); 166 167 close(p[1]); /* write side of pipe */ 168 if (read(p[0], &pdata, sizeof pdata) < 1) 169 err(1, "child did not collect time"); 170 if (waitpid(pid, NULL, 0) == -1) 171 err(1, "waitpid"); 172 173 /* 174 * A viable timestamp from the child contains no message. 175 */ 176 if (pdata.message[0]) { 177 pdata.message[sizeof(pdata.message)- 1] = '\0'; 178 write(STDERR_FILENO, pdata.message, strlen(pdata.message)); 179 exit(1); 180 } 181 182 if (!pr) { 183 if (!slidetime) { 184 logwtmp("|", "date", ""); 185 if (settimeofday(&pdata.new, NULL) == -1) 186 err(1, "Could not set time of day"); 187 logwtmp("{", "date", ""); 188 } else { 189 if (adjtime(&pdata.adjust, NULL) == -1) 190 err(1, "Could not adjust time of day"); 191 } 192 } 193 194 if (pledge("stdio rpath", NULL) == -1) 195 err(1, "pledge"); 196 197 if (!silent) { 198 struct tm *ltm; 199 char buf[80]; 200 time_t tim = pdata.new.tv_sec; 201 double adjsec; 202 203 ltm = localtime(&tim); 204 (void) strftime(buf, sizeof buf, "%a %b %e %H:%M:%S %Z %Y\n", ltm); 205 (void) fputs(buf, stdout); 206 207 adjsec = pdata.adjust.tv_sec + pdata.adjust.tv_usec / 1.0e6; 208 209 if (slidetime || verbose) { 210 if (ntp) 211 (void) fprintf(stdout, 212 "%s: adjust local clock by %.6f seconds\n", 213 __progname, adjsec); 214 else 215 (void) fprintf(stdout, 216 "%s: adjust local clock by %lld seconds\n", 217 __progname, (long long)pdata.adjust.tv_sec); 218 } 219 } 220 221 return 0; 222 } 223