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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: UNIX mail routines
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 20 December 1989
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26 * Last Edited: 30 August 2006
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27 */
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28
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29
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30 /* DEDICATION
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31 *
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32 * This file is dedicated to my dog, Unix, also known as Yun-chan and
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33 * Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast. Unix
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34 * passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
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35 * a two-month bout with cirrhosis of the liver.
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36 *
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37 * He was a dear friend, and I miss him terribly.
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38 *
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39 * Lift a leg, Yunie. Luv ya forever!!!!
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40 */
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41
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42 /* Validate line
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43 * Accepts: pointer to candidate string to validate as a From header
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44 * return pointer to end of date/time field
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45 * return pointer to offset from t of time (hours of ``mmm dd hh:mm'')
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46 * return pointer to offset from t of time zone (if non-zero)
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47 * Returns: t,ti,zn set if valid From string, else ti is NIL
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48 */
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49
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50 #define VALID(s,x,ti,zn) { \
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51 ti = 0; \
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52 if ((*s == 'F') && (s[1] == 'r') && (s[2] == 'o') && (s[3] == 'm') && \
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53 (s[4] == ' ')) { \
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54 for (x = s + 5; *x && *x != '\012'; x++); \
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55 if (*x) { \
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56 if (x[-1] == '\015') --x; \
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57 if (x - s >= 41) { \
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58 for (zn = -1; x[zn] != ' '; zn--); \
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59 if ((x[zn-1] == 'm') && (x[zn-2] == 'o') && (x[zn-3] == 'r') && \
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60 (x[zn-4] == 'f') && (x[zn-5] == ' ') && (x[zn-6] == 'e') && \
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61 (x[zn-7] == 't') && (x[zn-8] == 'o') && (x[zn-9] == 'm') && \
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62 (x[zn-10] == 'e') && (x[zn-11] == 'r') && (x[zn-12] == ' '))\
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63 x += zn - 12; \
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64 } \
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65 if (x - s >= 27) { \
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66 if (x[-5] == ' ') { \
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67 if (x[-8] == ':') zn = 0,ti = -5; \
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68 else if (x[-9] == ' ') ti = zn = -9; \
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69 else if ((x[-11] == ' ') && ((x[-10]=='+') || (x[-10]=='-'))) \
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70 ti = zn = -11; \
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71 } \
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72 else if (x[-4] == ' ') { \
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73 if (x[-9] == ' ') zn = -4,ti = -9; \
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74 } \
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75 else if (x[-6] == ' ') { \
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76 if ((x[-11] == ' ') && ((x[-5] == '+') || (x[-5] == '-'))) \
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77 zn = -6,ti = -11; \
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78 } \
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79 if (ti && !((x[ti - 3] == ':') && \
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80 (x[ti -= ((x[ti - 6] == ':') ? 9 : 6)] == ' ') && \
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81 (x[ti - 3] == ' ') && (x[ti - 7] == ' ') && \
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82 (x[ti - 11] == ' '))) ti = 0; \
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83 } \
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84 } \
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85 } \
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86 }
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87
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88 /* You are not expected to understand this macro, but read the next page if
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89 * you are not faint of heart.
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90 *
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91 * Known formats to the VALID macro are:
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92 * From user Wed Dec 2 05:53 1992
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93 * BSD From user Wed Dec 2 05:53:22 1992
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94 * SysV From user Wed Dec 2 05:53 PST 1992
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95 * rn From user Wed Dec 2 05:53:22 PST 1992
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96 * From user Wed Dec 2 05:53 -0700 1992
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97 * emacs From user Wed Dec 2 05:53:22 -0700 1992
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98 * From user Wed Dec 2 05:53 1992 PST
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99 * From user Wed Dec 2 05:53:22 1992 PST
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100 * From user Wed Dec 2 05:53 1992 -0700
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101 * Solaris From user Wed Dec 2 05:53:22 1992 -0700
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102 *
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103 * Plus all of the above with `` remote from xxx'' after it. Thank you very
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104 * much, smail and Solaris, for making my life considerably more complicated.
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105 */
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106
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107 /*
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108 * What? You want to understand the VALID macro anyway? Alright, since you
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109 * insist. Actually, it isn't really all that difficult, provided that you
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110 * take it step by step.
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111 *
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112 * Line 1 Initializes the return ti value to failure (0);
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113 * Lines 2-3 Validates that the 1st-5th characters are ``From ''.
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114 * Lines 4-6 Validates that there is an end of line and points x at it.
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115 * Lines 7-14 First checks to see if the line is at least 41 characters long.
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116 * If so, it scans backwards to find the rightmost space. From
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117 * that point, it scans backwards to see if the string matches
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118 * `` remote from''. If so, it sets x to point to the space at
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119 * the start of the string.
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120 * Line 15 Makes sure that there are at least 27 characters in the line.
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121 * Lines 16-21 Checks if the date/time ends with the year (there is a space
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122 * five characters back). If there is a colon three characters
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123 * further back, there is no timezone field, so zn is set to 0
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124 * and ti is set in front of the year. Otherwise, there must
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125 * either to be a space four characters back for a three-letter
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126 * timezone, or a space six characters back followed by a + or -
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127 * for a numeric timezone; in either case, zn and ti become the
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128 * offset of the space immediately before it.
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129 * Lines 22-24 Are the failure case for line 14. If there is a space four
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130 * characters back, it is a three-letter timezone; there must be a
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131 * space for the year nine characters back. zn is the zone
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132 * offset; ti is the offset of the space.
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133 * Lines 25-28 Are the failure case for line 20. If there is a space six
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134 * characters back, it is a numeric timezone; there must be a
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135 * space eleven characters back and a + or - five characters back.
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136 * zn is the zone offset; ti is the offset of the space.
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137 * Line 29-32 If ti is valid, make sure that the string before ti is of the
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138 * form www mmm dd hh:mm or www mmm dd hh:mm:ss, otherwise
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139 * invalidate ti. There must be a colon three characters back
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140 * and a space six or nine characters back (depending upon
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141 * whether or not the character six characters back is a colon).
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142 * There must be a space three characters further back (in front
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143 * of the day), one seven characters back (in front of the month),
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144 * and one eleven characters back (in front of the day of week).
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145 * ti is set to be the offset of the space before the time.
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146 *
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147 * Why a macro? It gets invoked a *lot* in a tight loop. On some of the
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148 * newer pipelined machines it is faster being open-coded than it would be if
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149 * subroutines are called.
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150 *
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151 * Why does it scan backwards from the end of the line, instead of doing the
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152 * much easier forward scan? There is no deterministic way to parse the
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153 * ``user'' field, because it may contain unquoted spaces! Yes, I tested it to
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154 * see if unquoted spaces were possible. They are, and I've encountered enough
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155 * evil mail to be totally unwilling to trust that ``it will never happen''.
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156 */
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157
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158 /* Build parameters */
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159
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160 #define KODRETRY 15 /* kiss-of-death retry in seconds */
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161 #define LOCKTIMEOUT 5 /* lock timeout in minutes */
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