1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. 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 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char sccsid[] = "@(#)netdate.c 8.1 (Berkeley) 5/31/93"; 35 #endif /* not lint */ 36 #endif 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/time.h> 43 #include <sys/socket.h> 44 45 #include <netinet/in.h> 46 #include <netdb.h> 47 #define TSPTYPES 48 #include <protocols/timed.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 57 #define WAITACK 2 /* seconds */ 58 #define WAITDATEACK 5 /* seconds */ 59 60 /* 61 * Set the date in the machines controlled by timedaemons by communicating the 62 * new date to the local timedaemon. If the timedaemon is in the master state, 63 * it performs the correction on all slaves. If it is in the slave state, it 64 * notifies the master that a correction is needed. 65 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 66 */ 67 int 68 netsettime(time_t tval) 69 { 70 struct timeval tout; 71 struct servent *sp; 72 struct tsp msg; 73 struct sockaddr_in lsin, dest, from; 74 fd_set ready; 75 long waittime; 76 int s, port, timed_ack, found, lerr; 77 socklen_t length; 78 char hostname[MAXHOSTNAMELEN]; 79 80 if ((sp = getservbyname("timed", "udp")) == NULL) { 81 warnx("timed/udp: unknown service"); 82 return (retval = 2); 83 } 84 85 dest.sin_port = sp->s_port; 86 dest.sin_family = AF_INET; 87 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY); 88 s = socket(AF_INET, SOCK_DGRAM, 0); 89 if (s < 0) { 90 if (errno != EAFNOSUPPORT) 91 warn("timed"); 92 return (retval = 2); 93 } 94 95 memset(&lsin, 0, sizeof(lsin)); 96 lsin.sin_family = AF_INET; 97 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { 98 lsin.sin_port = htons((u_short)port); 99 if (bind(s, (struct sockaddr *)&lsin, sizeof(lsin)) >= 0) 100 break; 101 if (errno == EADDRINUSE) 102 continue; 103 if (errno != EADDRNOTAVAIL) 104 warn("bind"); 105 goto bad; 106 } 107 if (port == IPPORT_RESERVED / 2) { 108 warnx("all ports in use"); 109 goto bad; 110 } 111 memset(&msg, 0, sizeof(msg)); 112 msg.tsp_type = TSP_SETDATE; 113 msg.tsp_vers = TSPVERSION; 114 if (gethostname(hostname, sizeof(hostname))) { 115 warn("gethostname"); 116 goto bad; 117 } 118 (void)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name)); 119 msg.tsp_seq = htons((u_short)0); 120 msg.tsp_time.tv_sec = htonl((u_long)tval); 121 msg.tsp_time.tv_usec = htonl((u_long)0); 122 length = sizeof(struct sockaddr_in); 123 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 124 warn("connect"); 125 goto bad; 126 } 127 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 128 if (errno != ECONNREFUSED) 129 warn("send"); 130 goto bad; 131 } 132 133 timed_ack = -1; 134 waittime = WAITACK; 135 loop: 136 tout.tv_sec = waittime; 137 tout.tv_usec = 0; 138 139 FD_ZERO(&ready); 140 FD_SET(s, &ready); 141 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); 142 143 length = sizeof(lerr); 144 if (!getsockopt(s, 145 SOL_SOCKET, SO_ERROR, (char *)&lerr, &length) && lerr) { 146 if (lerr != ECONNREFUSED) 147 warnc(lerr, "send (delayed error)"); 148 goto bad; 149 } 150 151 if (found > 0 && FD_ISSET(s, &ready)) { 152 length = sizeof(struct sockaddr_in); 153 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 154 (struct sockaddr *)&from, &length) < 0) { 155 if (errno != ECONNREFUSED) 156 warn("recvfrom"); 157 goto bad; 158 } 159 msg.tsp_seq = ntohs(msg.tsp_seq); 160 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 161 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 162 switch (msg.tsp_type) { 163 case TSP_ACK: 164 timed_ack = TSP_ACK; 165 waittime = WAITDATEACK; 166 goto loop; 167 case TSP_DATEACK: 168 (void)close(s); 169 return (0); 170 default: 171 warnx("wrong ack received from timed: %s", 172 tsptype[msg.tsp_type]); 173 timed_ack = -1; 174 break; 175 } 176 } 177 if (timed_ack == -1) 178 warnx("can't reach time daemon, time set locally"); 179 180 bad: 181 (void)close(s); 182 return (retval = 2); 183 } 184