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