1 | /* |
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2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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3 | * unrestricted use provided that this legend is included on all tape |
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4 | * media and as a part of the software program in whole or part. Users |
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5 | * may copy or modify Sun RPC without charge, but are not authorized |
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6 | * to license or distribute it to anyone else except as part of a product or |
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7 | * program developed by the user. |
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8 | * |
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9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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12 | * |
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13 | * Sun RPC is provided with no support and without any obligation on the |
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14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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15 | * modification or enhancement. |
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16 | * |
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17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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19 | * OR ANY PART THEREOF. |
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20 | * |
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21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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22 | * or profits or other special, indirect and consequential damages, even if |
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23 | * Sun has been advised of the possibility of such damages. |
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24 | * |
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25 | * Sun Microsystems, Inc. |
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26 | * 2550 Garcia Avenue |
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27 | * Mountain View, California 94043 |
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28 | */ |
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29 | |
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30 | /* |
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31 | * Copyright (c) 1988 by Sun Microsystems, Inc. |
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32 | |
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33 | */ |
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34 | |
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35 | /* |
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36 | * rtime - get time from remote machine |
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37 | * |
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38 | * gets time, obtaining value from host |
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39 | * on the udp/time socket. Since timeserver returns |
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40 | * with time of day in seconds since Jan 1, 1900, must |
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41 | * subtract seconds before Jan 1, 1970 to get |
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42 | * what unix uses. |
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43 | */ |
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44 | #include <stdlib.h> |
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45 | #include <string.h> |
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46 | #include <unistd.h> |
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47 | #include <errno.h> |
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48 | #include <sys/types.h> |
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49 | #include <sys/socket.h> |
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50 | #include <sys/time.h> |
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51 | #include <netinet/in.h> |
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52 | #include <stdio.h> |
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53 | #include <netdb.h> |
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54 | |
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55 | #if defined(LIBC_SCCS) && !defined(lint) |
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56 | /* from: static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI"; */ |
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57 | static const char rcsid[] = "$FreeBSD: src/lib/libc/rpc/rtime.c,v 1.5 2000/01/27 23:06:41 jasone Exp $"; |
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58 | #endif |
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59 | |
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60 | extern int _rpc_dtablesize __P(( void )); |
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61 | |
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62 | #define NYEARS (unsigned long)(1970 - 1900) |
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63 | #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4))) |
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64 | |
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65 | static void do_close __P(( int )); |
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66 | |
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67 | int |
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68 | rtime(addrp, timep, timeout) |
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69 | struct sockaddr_in *addrp; |
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70 | struct timeval *timep; |
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71 | struct timeval *timeout; |
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72 | { |
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73 | int s; |
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74 | fd_set readfds; |
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75 | int res; |
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76 | unsigned long thetime; |
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77 | struct sockaddr_in from; |
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78 | int fromlen; |
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79 | int type; |
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80 | struct servent *serv; |
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81 | |
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82 | if (timeout == NULL) { |
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83 | type = SOCK_STREAM; |
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84 | } else { |
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85 | type = SOCK_DGRAM; |
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86 | } |
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87 | s = socket(AF_INET, type, 0); |
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88 | if (s < 0) { |
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89 | return(-1); |
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90 | } |
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91 | addrp->sin_family = AF_INET; |
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92 | |
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93 | /* TCP and UDP port are the same in this case */ |
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94 | if ((serv = getservbyname("time", "tcp")) == NULL) { |
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95 | return(-1); |
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96 | } |
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97 | |
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98 | addrp->sin_port = serv->s_port; |
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99 | |
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100 | if (type == SOCK_DGRAM) { |
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101 | res = sendto(s, (char *)&thetime, sizeof(thetime), 0, |
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102 | (struct sockaddr *)addrp, sizeof(*addrp)); |
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103 | if (res < 0) { |
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104 | do_close(s); |
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105 | return(-1); |
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106 | } |
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107 | do { |
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108 | FD_ZERO(&readfds); |
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109 | FD_SET(s, &readfds); |
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110 | res = select(_rpc_dtablesize(), &readfds, |
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111 | (fd_set *)NULL, (fd_set *)NULL, timeout); |
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112 | } while (res < 0 && errno == EINTR); |
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113 | if (res <= 0) { |
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114 | if (res == 0) { |
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115 | errno = ETIMEDOUT; |
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116 | } |
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117 | do_close(s); |
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118 | return(-1); |
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119 | } |
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120 | fromlen = sizeof(from); |
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121 | res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0, |
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122 | (struct sockaddr *)&from, &fromlen); |
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123 | do_close(s); |
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124 | if (res < 0) { |
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125 | return(-1); |
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126 | } |
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127 | } else { |
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128 | if (connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) { |
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129 | do_close(s); |
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130 | return(-1); |
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131 | } |
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132 | res = _read(s, (char *)&thetime, sizeof(thetime)); |
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133 | do_close(s); |
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134 | if (res < 0) { |
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135 | return(-1); |
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136 | } |
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137 | } |
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138 | if (res != sizeof(thetime)) { |
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139 | errno = EIO; |
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140 | return(-1); |
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141 | } |
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142 | thetime = ntohl(thetime); |
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143 | timep->tv_sec = thetime - TOFFSET; |
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144 | timep->tv_usec = 0; |
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145 | return(0); |
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146 | } |
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147 | |
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148 | static void |
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149 | do_close(s) |
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150 | int s; |
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151 | { |
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152 | int save; |
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153 | |
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154 | save = errno; |
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155 | (void)_close(s); |
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156 | errno = save; |
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157 | } |
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