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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_types.h>
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10
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11
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12 static int mday[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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13
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346
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14 time_t
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15 ngx_http_parse_time(u_char *value, size_t len)
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0
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16 {
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17 u_char *p, *end;
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18 int day, month, year, hour, min, sec;
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19 enum {
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20 no = 0,
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232
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21 rfc822, /* Tue, 10 Nov 2002 23:50:13 */
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0
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22 rfc850, /* Tuesday, 10-Dec-02 23:50:13 */
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23 isoc /* Tue Dec 10 23:50:13 2002 */
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24 } fmt;
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25
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26 fmt = 0;
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27 end = value + len;
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28
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29 #if (NGX_SUPPRESS_WARN)
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30 day = 32;
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31 year = 2038;
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32 #endif
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33
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34 for (p = value; p < end; p++) {
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35 if (*p == ',') {
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36 break;
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37 }
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38
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39 if (*p == ' ') {
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40 fmt = isoc;
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41 break;
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42 }
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43 }
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44
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45 for (p++; p < end; p++)
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46 if (*p != ' ') {
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47 break;
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48 }
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49
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50 if (end - p < 18) {
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51 return NGX_ERROR;
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52 }
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53
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54 if (fmt != isoc) {
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55 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
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56 return NGX_ERROR;
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57 }
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58
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59 day = (*p - '0') * 10 + *(p + 1) - '0';
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60 p += 2;
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61
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62 if (*p == ' ') {
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63 if (end - p < 18) {
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64 return NGX_ERROR;
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65 }
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66 fmt = rfc822;
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67
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68 } else if (*p == '-') {
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69 fmt = rfc850;
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70
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71 } else {
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72 return NGX_ERROR;
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73 }
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74
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75 p++;
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76 }
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77
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78 switch (*p) {
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79
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80 case 'J':
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81 month = *(p + 1) == 'a' ? 0 : *(p + 2) == 'n' ? 5 : 6;
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82 break;
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83
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84 case 'F':
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85 month = 1;
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86 break;
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87
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88 case 'M':
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89 month = *(p + 2) == 'r' ? 2 : 4;
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90 break;
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91
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92 case 'A':
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93 month = *(p + 1) == 'p' ? 3 : 7;
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94 break;
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95
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96 case 'S':
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97 month = 8;
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98 break;
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99
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100 case 'O':
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101 month = 9;
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102 break;
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103
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104 case 'N':
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105 month = 10;
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106 break;
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107
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108 case 'D':
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109 month = 11;
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110 break;
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111
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112 default:
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113 return NGX_ERROR;
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114 }
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115
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116 p += 3;
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117
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118 if ((fmt == rfc822 && *p != ' ') || (fmt == rfc850 && *p != '-')) {
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119 return NGX_ERROR;
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120 }
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121
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122 p++;
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123
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124 if (fmt == rfc822) {
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125 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
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126 || *(p + 2) < '0' || *(p + 2) > '9'
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127 || *(p + 3) < '0' || *(p + 3) > '9')
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128 {
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129 return NGX_ERROR;
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130 }
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131
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132 year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
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133 + (*(p + 2) - '0') * 10 + *(p + 3) - '0';
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134 p += 4;
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135
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136 } else if (fmt == rfc850) {
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137 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
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138 return NGX_ERROR;
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139 }
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140
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141 year = (*p - '0') * 10 + *(p + 1) - '0';
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142 year += (year < 70) ? 2000 : 1900;
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143 p += 2;
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144 }
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145
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146 if (fmt == isoc) {
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147 if (*p == ' ') {
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148 p++;
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149 }
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150
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151 if (*p < '0' || *p > '9') {
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152 return NGX_ERROR;
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153 }
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154
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155 day = *p++ - '0';
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156
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157 if (*p != ' ') {
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158 if (*p < '0' || *p > '9') {
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159 return NGX_ERROR;
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160 }
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161
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162 day = day * 10 + *p++ - '0';
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163 }
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164
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165 if (end - p < 14) {
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166 return NGX_ERROR;
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167 }
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168 }
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169
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170 if (*p++ != ' ') {
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171 return NGX_ERROR;
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172 }
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173
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174 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
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175 return NGX_ERROR;
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176 }
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177
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178 hour = (*p - '0') * 10 + *(p + 1) - '0';
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179 p += 2;
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180
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181 if (*p++ != ':') {
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182 return NGX_ERROR;
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183 }
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184
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185 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
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186 return NGX_ERROR;
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187 }
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188
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189 min = (*p - '0') * 10 + *(p + 1) - '0';
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190 p += 2;
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191
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192 if (*p++ != ':') {
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193 return NGX_ERROR;
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194 }
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195
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196 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
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197 return NGX_ERROR;
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198 }
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199
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200 sec = (*p - '0') * 10 + *(p + 1) - '0';
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201
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202 if (fmt == isoc) {
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203 p += 2;
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204
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205 if (*p++ != ' ') {
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206 return NGX_ERROR;
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207 }
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208
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209 if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
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210 || *(p + 2) < '0' || *(p + 2) > '9'
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211 || *(p + 3) < '0' || *(p + 3) > '9')
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212 {
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213 return NGX_ERROR;
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214 }
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215
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216 year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
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217 + (*(p + 2) - '0') * 10 + *(p + 3) - '0';
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218 }
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219
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220 if (hour > 23 || min > 59 || sec > 59) {
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221 return NGX_ERROR;
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222 }
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223
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224 if (day == 29 && month == 1) {
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225 if ((year & 3) || ((year % 100 == 0) && (year % 400) != 0)) {
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226 return NGX_ERROR;
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227 }
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228
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229 } else if (day > mday[month]) {
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230 return NGX_ERROR;
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231 }
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232
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50
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233 #if (NGX_TIME_T_SIZE <= 4)
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234
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235 if (year >= 2038) {
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0
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236 return NGX_ERROR;
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237 }
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238
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50
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239 #endif
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240
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0
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241 /*
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242 * shift new year to March 1 and start months from 1 (not 0),
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28
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243 * it is needed for Gauss's formula
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0
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244 */
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245
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246 if (--month <= 0) {
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276
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247 month += 12;
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248 year -= 1;
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0
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249 }
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250
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346
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251 /* Gauss's formula for Grigorian days from March 1, 1 BC */
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0
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252
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253 return (365 * year + year / 4 - year / 100 + year / 400
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254 + 367 * month / 12 - 31
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255 + day
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256
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28
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257 /*
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258 * 719527 days were between March 1, 1 BC and March 1, 1970,
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276
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259 * 31 and 28 days were in January and February 1970
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28
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260 */
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0
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261
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262 - 719527 + 31 + 28) * 86400 + hour * 3600 + min * 60 + sec;
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263 }
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